U.S. patent application number 14/927529 was filed with the patent office on 2017-05-04 for apparatus for heating smokable material.
The applicant listed for this patent is British American Tobacco (Investments) Limited. Invention is credited to Thomas P. BLANDINO, James J. FRATER, Duane A. KAUFMAN, Raymond J. ROBEY, Andrew P. WILKE.
Application Number | 20170119046 14/927529 |
Document ID | / |
Family ID | 57389376 |
Filed Date | 2017-05-04 |
United States Patent
Application |
20170119046 |
Kind Code |
A1 |
KAUFMAN; Duane A. ; et
al. |
May 4, 2017 |
Apparatus for Heating Smokable Material
Abstract
Disclosed is apparatus for heating smokable material to
volatilize at least one component of the smokable material. The
apparatus comprises a heating zone for receiving an article, and a
magnetic field generator for generating a varying magnetic field
that penetrates the heating zone. The article comprises smokable
material and heating material that is heatable by penetration with
a varying magnetic field to heat the smokable material. The
magnetic field generator comprises a magnetically permeable core
and a coil. The core comprises a magnetically permeable first
portion and magnetically permeable first and second arms extending
from the first portion. The coil is wound around the first portion
of the core. The first and second arms of the core are on different
sides of the heating zone.
Inventors: |
KAUFMAN; Duane A.;
(Hollandale, WI) ; WILKE; Andrew P.; (Madison,
WI) ; BLANDINO; Thomas P.; (Cottage Grove, WI)
; FRATER; James J.; (Madison, WI) ; ROBEY; Raymond
J.; (Madison, WI) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
British American Tobacco (Investments) Limited |
London |
|
GB |
|
|
Family ID: |
57389376 |
Appl. No.: |
14/927529 |
Filed: |
October 30, 2015 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A24F 47/008 20130101;
A24F 40/20 20200101; H05B 6/105 20130101; A24F 40/465 20200101;
H05B 6/108 20130101; H05B 6/365 20130101 |
International
Class: |
A24F 47/00 20060101
A24F047/00; H05B 6/10 20060101 H05B006/10 |
Claims
1. An apparatus for heating smokable material to volatilize at
least one component of the smokable material, the apparatus
comprising: a heating zone for receiving an article, the article
comprising smokable material and heating material that is heatable
by penetration with a varying magnetic field to heat the smokable
material; and a magnetic field generator for generating a varying
magnetic field that penetrates the heating zone, the magnetic field
generator comprising a magnetically permeable core and a coil;
wherein the core comprises a magnetically permeable first portion
and magnetically permeable first and second arms extending from the
first portion, wherein the coil is wound around the first portion
of the core, and wherein the first and second arms of the core are
on different sides of the heating zone.
2. The apparatus of claim 1, wherein the first and second arms of
the core have respective free ends on different sides of the
heating zone.
3. The apparatus of claim 1, wherein the first and second arms of
the core are on opposite sides of the heating zone.
4. The apparatus of claim 3, wherein the first and second arms of
the core have respective free ends on opposite sides of the heating
zone.
5. The apparatus of claim 4, wherein the respective free ends of
the first and second arms of the core face each other through the
heating zone.
6. The apparatus of claim 1, wherein the heating zone is elongate,
and wherein each of the first and second arms of the core is
elongate in a direction parallel to a longitudinal axis of the
heating zone.
7. The apparatus of claim 1, wherein the first and second arms of
the core extend from opposite ends of the first portion of the
core.
8. The apparatus of claim 3, wherein the core comprises third and
fourth arms extending from the first portion, and wherein the third
and fourth arms of the core are on opposite sides of the heating
zone
9. The apparatus of claim 8, wherein the first and third arms of
the core extend from a first end of the first portion of the core,
and the second and fourth arms of the core extend from an opposite
second end of the first portion of the core.
10. The apparatus of claim 8, wherein the first, second, third and
fourth arms connect the first portion of the core to a second
portion of the core, and wherein the second portion of the core is
on an opposite side of the heating zone from the first portion of
the core.
11. The apparatus of claim 1, wherein the heating zone has an open
first end through which the article is insertable into the heating
zone, a second end opposite the first end, and one or more sides
connecting the first and second ends; and wherein the first arm of
the core is at the side, or one of the sides, of the heating zone,
and the second arm of the core is at the second end of the heating
zone.
12. The apparatus of claim 11, wherein the first and second arms of
the core have respective free ends; and wherein the free end of the
first arm of the core is at the side, or one of the sides, of the
heating zone, and the free end of the second arm of the core is at
the second end of the heating zone.
13. The apparatus of claim 12, wherein the respective free ends of
the first and second arms of the core face the heating zone.
14. The apparatus of claim 1, wherein the magnetic field generator
comprises a magnetically permeable second core and a second coil;
and wherein the second core comprises a magnetically permeable
first portion and magnetically permeable first and second arms
extending from the first portion, wherein the second coil is wound
around the first portion of the second core, and wherein the first
and second arms of the second core have respective free ends that
face the heating zone.
15. The apparatus of claim 1, wherein the core comprises, or is
composed of, ferrite.
16. The apparatus of claim 1, wherein the first portion of the core
is unitary with each of the first and second arms of the core.
17. The apparatus of claim 1, wherein the heating zone is a recess
in the apparatus or a recess in the core.
18. A system, comprising: an article comprising smokable material
and a heater, wherein the heater comprises heating material that is
heatable by penetration with a varying magnetic field to heat the
smokable material; and apparatus for heating the smokable material
to volatilize at least one component of the smokable material, the
apparatus comprising: a heating zone for receiving the article, and
a magnetic field generator for generating a varying magnetic field
that penetrates the heater when the article is in the heating zone,
the magnetic field generator comprising a magnetically permeable
core and a coil; wherein the core comprises a magnetically
permeable first portion and magnetically permeable first and second
arms extending from the first portion, wherein the coil is wound
around the first portion of the core, and wherein the first and
second arms of the core are on different sides of the heating
zone.
19. The system of claim 18, wherein the magnetic field generator
comprises a magnetically permeable second core and a second coil;
and wherein the second core comprises a magnetically permeable
first portion and magnetically permeable first and second arms
extending from the first portion, wherein the second coil is wound
around the first portion of the second core, and wherein the first
and second arms of the second core have respective free ends that
face the heating zone.
20. The system of claim 19, wherein the article comprises a second
heater comprising heating material that is heatable by penetration
with a varying magnetic field to heat the smokable material,
wherein the respective free ends of the first and second arms of
the second core face the second heater when the article is in the
heating zone.
21. The system of claim 20, wherein the smokable material of the
article is located between the heater and the second heater.
22. The system of claim 18, wherein the smokable material comprises
tobacco and/or one or more humectants.
23. The system of claim 18, wherein the heating material comprises
one or more materials selected from the group consisting of: an
electrically-conductive material, a magnetic material, and a
magnetic electrically-conductive material.
24. The system of claim 18, wherein the heating material comprises
a metal or a metal alloy.
25. The system of claim 18, wherein the heating material comprises
one or more materials selected from the group consisting of:
aluminum, gold, iron, nickel, cobalt, conductive carbon, graphite,
plain-carbon steel, stainless steel, ferritic stainless steel,
copper, and bronze.
Description
TECHNICAL FIELD
[0001] Embodiments relate to apparatus for heating smokable
material, such as tobacco, to volatilize at least one component of
the smokable material, and to systems comprising such apparatus and
articles comprising such smokable material and for use with such
apparatus.
BACKGROUND
[0002] Smoking articles such as cigarettes, cigars and the like
burn tobacco during use to create tobacco smoke. Attempts have been
made to provide alternatives to these articles by creating products
that release compounds without combusting. Examples of such
products are so-called "heat not burn" products or tobacco heating
devices or products, which release compounds by heating, but not
burning, material. The material may be, for example, tobacco or
other non-tobacco products, which may or may not contain
nicotine.
SUMMARY
[0003] A first aspect of embodiments provides apparatus for heating
smokable material to volatilize at least one component of the
smokable material, the apparatus comprising:
[0004] a heating zone for receiving an article, the article
comprising smokable material and heating material that is heatable
by penetration with a varying magnetic field to heat the smokable
material; and
[0005] a magnetic field generator for generating a varying magnetic
field that penetrates the heating zone, the magnetic field
generator comprising a magnetically permeable core and a coil;
[0006] wherein the core comprises a magnetically permeable first
portion and magnetically permeable first and second arms extending
from the first portion, wherein the coil is wound around the first
portion of the core, and wherein the first and second arms of the
core are on different sides of the heating zone.
[0007] In an exemplary embodiment, the first and second arms of the
core have respective free ends on different sides of the heating
zone.
[0008] In an exemplary embodiment, the first and second arms of the
core are on opposite sides of the heating zone.
[0009] In an exemplary embodiment, the first and second arms of the
core have respective free ends on opposite sides of the heating
zone.
[0010] In an exemplary embodiment, the respective free ends of the
first and second arms of the core face each other through the
heating zone.
[0011] In an exemplary embodiment, the heating zone is elongate,
and each of the first and second arms of the core is elongate in a
direction parallel to a longitudinal axis of the heating zone.
[0012] In an exemplary embodiment, the first and second arms of the
core extend from opposite ends of the first portion of the
core.
[0013] In an exemplary embodiment, the core comprises third and
fourth arms extending from the first portion, and the third and
fourth arms of the core are on opposite sides of the heating
zone.
[0014] In an exemplary embodiment, the first and third arms of the
core extend from a first end of the first portion of the core, and
the second and fourth arms of the core extend from an opposite
second end of the first portion of the core.
[0015] In an exemplary embodiment, the first, second, third and
fourth arms connect the first portion of the core to a second
portion of the core, and wherein the second portion of the core is
on an opposite side of the heating zone from the first portion of
the core.
[0016] In an exemplary embodiment, the magnetic field generator
comprises a second coil wound around the second portion of the
core.
[0017] In an exemplary embodiment, the heating zone has an open
first end through which the article is insertable into the heating
zone, a second end opposite the first end, and one or more sides
connecting the first and second ends; and the first arm of the core
is at the side, or one of the sides, of the heating zone, and the
second arm of the core is at the second end of the heating
zone.
[0018] In an exemplary embodiment, the first and second arms of the
core have respective free ends; and the free end of the first arm
of the core is at the side, or one of the sides, of the heating
zone, and the free end of the second arm of the core is at the
second end of the heating zone.
[0019] In an exemplary embodiment, the respective free ends of the
first and second arms of the core face the heating zone.
[0020] In an exemplary embodiment, the magnetic field generator
comprises a magnetically permeable second core; and
[0021] the second core comprises a magnetically permeable first
portion and magnetically permeable first and second arms extending
from the first portion, the second coil is wound around the first
portion of the second core, and the first and second arms of the
second core have respective free ends that face the heating
zone.
[0022] In an exemplary embodiment, the core comprises, or is
composed of, ferrite.
[0023] In an exemplary embodiment, the first portion of the core is
unitary with each of the first and second arms of the core.
[0024] In an exemplary embodiment, the heating zone is a recess in
the apparatus. In an exemplary embodiment, the heating zone is a
recess in the core.
[0025] In an exemplary embodiment, the core is comprises, or is
composed of, ferrite.
[0026] In an exemplary embodiment, the core comprises plural layers
of electrically-conductive material that are isolated from one
another by non-electrically-conductive material.
[0027] In an exemplary embodiment, the coil extends along an axis
that is perpendicular to a longitudinal axis of the heating
zone.
[0028] In an exemplary embodiment, the coil extends along an axis
that is parallel to a longitudinal axis of the heating zone.
[0029] In an exemplary embodiment, the apparatus is for heating
smokable material to volatilize at least one component of the
smokable material without burning the smokable material.
[0030] A second aspect of embodiments provides a system,
comprising:
[0031] an article comprising smokable material and a heater,
wherein the heater comprises heating material that is heatable by
penetration with a varying magnetic field to heat the smokable
material; and
[0032] apparatus for heating the smokable material to volatilize at
least one component of the smokable material, the apparatus
comprising: [0033] a heating zone for receiving the article; and
[0034] a magnetic field generator for generating a varying magnetic
field that penetrates the heater when the article is in the heating
zone, the magnetic field generator comprising a magnetically
permeable core and a coil; [0035] wherein the core comprises a
magnetically permeable first portion and magnetically permeable
first and second arms extending from the first portion, wherein the
coil is wound around the first portion of the core, and wherein the
first and second arms of the core are on different sides of the
heating zone.
[0036] In an exemplary embodiment, the magnetic field generator
comprises a magnetically permeable second core and a second coil;
and
[0037] the second core comprises a magnetically permeable first
portion and magnetically permeable first and second arms extending
from the first portion, the second coil is wound around the first
portion of the second core, and the first and second arms of the
second core have respective free ends that face the heating
zone.
[0038] In an exemplary embodiment, the article comprises a second
heater comprising heating material that is heatable by penetration
with a varying magnetic field to heat the smokable material, and
the respective free ends of the first and second arms of the second
core face the second heater when the article is in the heating
zone.
[0039] In an exemplary embodiment, the smokable material of the
article is located between the heater and the second heater.
[0040] In an exemplary embodiment, the smokable material comprises
tobacco and/or one or more humectants.
[0041] In an exemplary embodiment, the heating material comprises
one or more materials selected from the group consisting of: an
electrically-conductive material, a magnetic material, and a
magnetic electrically-conductive material.
[0042] In an exemplary embodiment, the heating material comprises a
metal or a metal alloy.
[0043] In an exemplary embodiment, the heating material comprises
one or more materials selected from the group consisting of:
aluminum, gold, iron, nickel, cobalt, conductive carbon, graphite,
plain-carbon steel, stainless steel, ferritic stainless steel,
copper, and bronze.
[0044] In an exemplary embodiment, the article of the system is the
article of the first aspect of embodiments. The article of the
system may have any one or more of the features discussed above as
being present in respective exemplary embodiments of the article of
the first aspect.
BRIEF DESCRIPTION OF THE DRAWINGS
[0045] Embodiments will now be described, by way of example only,
with reference to the accompanying drawings, in which:
[0046] FIG. 1 shows a schematic view of an example of a magnetic
field generator of apparatus for heating smokable material to
volatilize at least one component of the smokable material.
[0047] FIG. 2 shows a schematic perspective view of an example of a
system, the system comprising an article comprising smokable
material, and apparatus for heating the smokable material to
volatilize at least one component of the smokable material.
[0048] FIG. 3 shows a schematic perspective view of an example of
another system, the system comprising an article comprising
smokable material, and apparatus for heating the smokable material
to volatilize at least one component of the smokable material.
[0049] FIG. 4 shows a schematic partial cross-sectional view of an
example of another system, the system comprising an article
comprising smokable material, and apparatus for heating the
smokable material to volatilize at least one component of the
smokable material.
DETAILED DESCRIPTION
[0050] As used herein, the term "smokable material" includes
materials that provide volatilized components upon heating,
typically in the form of vapor or an aerosol. "Smokable material"
may be a non-tobacco-containing material or a tobacco-containing
material. "Smokable material" may, for example, include one or more
of tobacco per se, tobacco derivatives, expanded tobacco,
reconstituted tobacco, tobacco extract, homogenized tobacco or
tobacco substitutes. The smokable material can be in the form of
ground tobacco, cut rag tobacco, extruded tobacco, reconstituted
tobacco, reconstituted smokable material, liquid, gel, gelled
sheet, powder, or agglomerates, or the like. "Smokable material"
also may include other, non-tobacco, products, which, depending on
the product, may or may not contain nicotine. "Smokable material"
may comprise one or more humectants, such as glycerol or propylene
glycol.
[0051] As used herein, the term "heating material" or "heater
material" refers to material that is heatable by penetration with a
varying magnetic field.
[0052] As used herein, the terms "flavor" and "flavorant" refer to
materials which, where local regulations permit, may be used to
create a desired taste or aroma in a product for adult consumers.
They may include extracts (e.g., licorice, hydrangea, Japanese
white bark magnolia leaf, chamomile, fenugreek, clove, menthol,
Japanese mint, aniseed, cinnamon, herb, wintergreen, cherry, berry,
peach, apple, Drambuie, bourbon, scotch, whiskey, spearmint,
peppermint, lavender, cardamom, celery, cascarilla, nutmeg,
sandalwood, bergamot, geranium, honey essence, rose oil, vanilla,
lemon oil, orange oil, cassia, caraway, cognac, jasmine,
ylang-ylang, sage, fennel, piment, ginger, anise, coriander,
coffee, or a mint oil from any species of the genus Mentha), flavor
enhancers, bitterness receptor site blockers, sensorial receptor
site activators or stimulators, sugars and/or sugar substitutes
(e.g., sucralose, acesulfame potassium, aspartame, saccharine,
cyclamates, lactose, sucrose, glucose, fructose, sorbitol, or
mannitol), and other additives such as charcoal, chlorophyll,
minerals, botanicals, or breath freshening agents. They may be
imitation, synthetic or natural ingredients or blends thereof. They
may be in any suitable form, for example, oil, liquid, gel, powder,
or the like.
[0053] Induction heating is a process in which an
electrically-conductive object is heated by penetrating the object
with a varying magnetic field. The process is described by
Faraday's law of induction and Ohm's law. An induction heater may
comprise an electromagnet and a device for passing a varying
electrical current, such as an alternating current, through the
electromagnet. When the electromagnet and the object to be heated
are suitably relatively positioned so that the resultant varying
magnetic field produced by the electromagnet penetrates the object,
one or more eddy currents are generated inside the object. The
object has a resistance to the flow of electrical currents.
Therefore, when such eddy currents are generated in the object,
their flow against the electrical resistance of the object causes
the object to be heated. This process is called Joule, ohmic, or
resistive heating. An object that is capable of being inductively
heated is known as a susceptor.
[0054] It has been found that, when the susceptor is in the form of
a closed circuit, magnetic coupling between the susceptor and the
electromagnet in use is enhanced, which results in greater or
improved Joule heating.
[0055] Magnetic hysteresis heating is a process in which an object
made of a magnetic material is heated by penetrating the object
with a varying magnetic field. A magnetic material can be
considered to comprise many atomic-scale magnets, or magnetic
dipoles. When a magnetic field penetrates such material, the
magnetic dipoles align with the magnetic field. Therefore, when a
varying magnetic field, such as an alternating magnetic field, for
example as produced by an electromagnet, penetrates the magnetic
material, the orientation of the magnetic dipoles changes with the
varying applied magnetic field. Such magnetic dipole reorientation
causes heat to be generated in the magnetic material.
[0056] When an object is both electrically-conductive and magnetic,
penetrating the object with a varying magnetic field can cause both
Joule heating and magnetic hysteresis heating in the object.
Moreover, the use of magnetic material can strengthen the magnetic
field, which can intensify the Joule heating.
[0057] In each of the above processes, as heat is generated inside
the object itself, rather than by an external heat source by heat
conduction, a rapid temperature rise in the object and more uniform
heat distribution can be achieved, particularly through selection
of suitable object material and geometry, and suitable varying
magnetic field magnitude and orientation relative to the object.
Moreover, as induction heating and magnetic hysteresis heating do
not require a physical connection to be provided between the source
of the varying magnetic field and the object, design freedom and
control over the heating profile may be greater, and cost may be
lower.
[0058] Referring to FIG. 1, there is shown a schematic view of an
example of a magnetic field generator 120 of apparatus for heating
smokable material to volatilize at least one component of the
smokable material, in accordance with an embodiment. The magnetic
field generator 120 shown in FIG. 1 is included in the respective
apparatuses 100, 200, 300 described below with reference to FIGS. 2
to 4, respectively. However, in other embodiments, the apparatus
100, 200, 300 may comprise a different magnetic field generator to
that shown in FIG. 1.
[0059] In this embodiment, the magnetic field generator 120
comprises an electrical power source 130, a coil 140, a
magnetically permeable core 150, a device 160 for passing a varying
electrical current, such as an alternating current, through the
coil 140, a controller 170, a user interface 180 for user-operation
of the controller 170, and a temperature sensor 190.
[0060] In this embodiment, the electrical power source 130 is a
rechargeable battery. In other embodiments, the electrical power
source 130 may be other than a rechargeable battery, such as a
non-rechargeable battery, a capacitor, a battery-capacitor hybrid,
or a connection to a mains electricity supply.
[0061] The coil 140 may take any suitable form. In this embodiment,
the coil 140 is a helical coil of electrically-conductive material,
such as copper. The coil 140 is wound or wrapped around a portion
of the magnetically permeable core 150.
[0062] The magnetically permeable core 150 concentrates the
magnetic flux produced by the coil 140 in use and makes a more
powerful magnetic field. Furthermore, the magnetically permeable
core 150 helps to direct the magnetic flux to its intended target.
The intended target in the embodiments discussed below is a heater
20, 22 of an article 1, 2, 3. The heater 20, 22 comprises heating
material that is heatable by penetration with a varying magnetic
field. Example such heating materials are discussed below. In the
embodiments described below, the heater 20, 22 is for heating
smokable material 10 of the article 1, 2, 3. In some embodiments,
the coil 140 may be wound around only a portion (i.e. not all) of
the magnetically permeable core 150.
[0063] The magnetically permeable core 150 can have high magnetic
permeability and low electrical conductivity in embodiments. The
latter helps prevent the generation of eddy currents in the
magnetically permeable core 150 in use, which helps to prevent the
magnetically permeable core 150 becoming heated in use.
[0064] In each of the embodiments described herein with reference
to FIGS. 1 to 4, the magnetically permeable core 150 comprises, or
is composed of, ferrite. The ferrite may, for example, contain iron
oxide combined with nickel and/or zinc and/or manganese. The
ferrite may have a low coercivity and be considered a "soft
ferrite," or have a high coercivity and be considered a "hard
ferrite." Example usable soft ferrites are manganese-zinc ferrite,
with the formula Mn.sub.aZn.sub.(1-a)Fe.sub.2O.sub.4, and
nickel-zinc ferrite, with the formula
Ni.sub.aZn.sub.(1-a)Fe.sub.2O.sub.4. However, in respective
variations to these embodiments, the magnetically permeable core
150 may be made of a different material or materials. For example,
in some embodiments, the magnetically permeable core 150 may
comprise plural layers of electrically-conductive material that are
isolated from one another by non-electrically-conductive material.
The magnetically permeable core 150 may have dozens, or even
hundreds, of layers of electrically-conductive material that are
isolated from one another by non-electrically-conductive
material.
[0065] In this embodiment, the device 160 for passing a varying
current through the coil 140 is electrically connected between the
electrical power source 130 and the coil 140. In this embodiment,
the controller 170 also is electrically connected to the electrical
power source 130, and is communicatively connected to the device
160 to control the device 160. More specifically, in this
embodiment, the controller 170 is for controlling the device 160,
so as to control the supply of electrical power from the electrical
power source 130 to the coil 140. In this embodiment, the
controller 170 comprises an integrated circuit (IC), such as an IC
on a printed circuit board (PCB). In other embodiments, the
controller 170 may take a different form. In some embodiments, the
apparatus may have a single electrical or electronic component
comprising the device 160 and the controller 170. The controller
170 is operated in this embodiment by user-operation of the user
interface 180. The user interface 180 may be located at the
exterior of the apparatus 100, 200, 300 into which the magnetic
field generator 120 is incorporated. The user interface 180 may
comprise a push-button, a toggle switch, a dial, a touchscreen, or
the like. In other embodiments, the user interface 180 may be
remote and connected to the rest of the apparatus wirelessly, such
as via Bluetooth.
[0066] In this embodiment, operation of the user interface 180 by a
user causes the controller 170 to cause the device 160 to cause an
alternating electrical current to pass through the coil 140, so as
to cause the coil 140 to generate an alternating magnetic field. In
the embodiments described below with reference to FIGS. 2 to 4,
when the article 1, 2, 3 is located in the heating zone 110, the
coil 140 and the heater 20 of the article 1, 2, 3 are suitably
relatively positioned so that the alternating magnetic field
produced by the coil 140 penetrates the heating material of the
heater 20 of the article 1, 2, 3. As further described herein, the
magnetically permeable core 150 helps to direct the magnetic field
so that the magnetic field penetrates the heating material of the
heater 20 of the article 1, 2, 3. When the heating material of the
heater 20 of the article 1, 2, 3 is an electrically-conductive
material, this may cause the generation of one or more eddy
currents in the heating material. The flow of eddy currents in the
heating material against the electrical resistance of the heating
material causes the heating material to be heated by Joule heating.
As mentioned above, when the heating material is made of a magnetic
material, the orientation of magnetic dipoles in the heating
material changes with the changing applied magnetic field, which
causes heat to be generated in the heating material.
[0067] In this embodiment, the temperature sensor 190 is for
sensing a temperature of the heating zone 110 in use. The
temperature sensor 190 is communicatively connected to the
controller 170, so that the controller 170 is able to monitor the
temperature of the heating zone 110. In some embodiments, the
temperature sensor 190 may be arranged to take an optical
temperature measurement of the heating zone 110 or article 1, 2, 3.
In some embodiments, the article 1, 2, 3 may comprise a temperature
detector, such as a resistance temperature detector (RTD), for
detecting a temperature of the article 1, 2, 3. The article 1, 2, 3
may further comprise one or more terminals connected, such as
electrically-connected, to the temperature detector. The
terminal(s) may be for making connection, such as electrical
connection, with a temperature monitor of the magnetic field
generator when the article 1, 2, 3 is in the heating zone 111. The
controller 170 may comprise the temperature monitor. The
temperature monitor of the apparatus 100 may thus be able to
determine a temperature of the article 1, 2, 3 during use of the
article 1, 2, 3 with the apparatus 100, 200, 300.
[0068] In some embodiments, by providing that the heating material
of the heater 20 of the article 1, 2, 3 has a suitable resistance,
the response of the heating material to a change in temperature
could be sufficient to give information regarding temperature
inside the article 1, 2, 3. The temperature sensor 190 may then
comprise a probe for analyzing the heating material.
[0069] On the basis of one or more signals received from the
temperature sensor 190 or temperature detector, the controller 170
may cause the device 160 to adjust a characteristic of the varying
or alternating electrical current passed through the coil 140 as
necessary, in order to ensure that the temperature of the heating
zone 110 remains within a predetermined temperature range. The
characteristic may be, for example, amplitude or frequency. Within
the predetermined temperature range, in use the smokable material
10 within an article 1, 2, 3 located in the heating zone 110 is
heated sufficiently to volatilize at least one component of the
smokable material 10 without combusting the smokable material 10.
Accordingly, the controller 170, and the apparatus 100, 200, 300 as
a whole, is arranged to heat the smokable material 10 to volatilize
the at least one component of the smokable material 10 without
combusting the smokable material 10. In some embodiments, the
temperature range is about 50.degree. C. to about 300.degree. C.,
such as between about 50.degree. C. and about 250.degree. C.,
between about 50.degree. C. and about 150.degree. C., between about
50.degree. C. and about 120.degree. C., between about 50.degree. C.
and about 100.degree. C., between about 50.degree. C. and about
80.degree. C., or between about 60.degree. C. and about 70.degree.
C. In some embodiments, the temperature range is between about
170.degree. C. and about 220.degree. C. In other embodiments, the
temperature range may be other than this range.
[0070] In some embodiments, the temperature sensor 190 may be
omitted.
[0071] Referring to FIG. 2, there is shown a schematic perspective
view of an example of a system according to an embodiment. The
system 1000 comprises an article 1 comprising smokable material 10,
and apparatus 100 for heating the smokable material 10 to
volatilize at least one component of the smokable material 10. In
this embodiment, the apparatus 100 is for heating the smokable
material 10 to volatilize at least one component of the smokable
material 10 without burning the smokable material 10.
[0072] In this embodiment, the article 1 of the system 1000
comprises a heater 20 comprising heating material. The heating
material is heatable by penetration with a varying magnetic field.
The heater 20 is within the smokable material 10. In other
embodiments, the smokable material 10 may be on only one side of
the heater 20. The article 1 also comprises a cover 30 that
encircles the smokable material 10 and the heater 20 to help
maintain the relative positions of the smokable material 10 and the
heater 20. The cover 30 may thermally insulate the interior of the
cover 30 from the exterior of the cover 30. The cover 30 may
electrically insulate the heater 20 from the core 150. The cover 30
may be made of any suitable material, such as paper, card, a
plastics material, or the like. In other embodiments, the cover 30
may take a different form or be omitted.
[0073] In this embodiment, the article 1 is elongate and
cylindrical with a substantially circular cross section in a plane
normal to a longitudinal axis of the article 1. However, in other
embodiments, the article 1 may have a cross section other than
circular and/or not be elongate and/or not be cylindrical. The
article 1 may have proportions approximating those of a
cigarette.
[0074] In this embodiment, the apparatus 100 comprises a heating
zone 110 for receiving the article 1, and the magnetic field
generator 120 shown schematically in FIG. 1. In this embodiment,
the heating zone 110 is a recess in the apparatus 100. Moreover, in
this embodiment, the heating zone 110 is a recess in the core 150.
More specifically, in this embodiment, the recess 110 is elongate
and has a longitudinal axis A-A. Furthermore, although not
expressly shown in FIG. 2, in this embodiment the recess 110 is
cylindrical with a substantially circular cross section in a plane
normal to the longitudinal axis A-A of the recess 110. In other
embodiments, the heating zone 110 may have a cross section other
than circular and/or not be elongate and/or not be cylindrical. In
this embodiment, the article 1 and the recess 110 are relatively
dimensioned so that the article 1 is a snug fit in the recess
110.
[0075] In this embodiment, the core 150 of the magnetic field
generator 120 comprises a magnetically permeable first portion 155,
a magnetically permeable first arm 151, and a magnetically
permeable second arm 152. The first arm 151 extends from a first
end 155a of the first portion 155 of the core 150, and the second
arm 152 extends from a second end 155b of the first portion 155 of
the core 150. The second end 155b of the first portion 155 is
opposite from the first end 155a of the first portion 155.
[0076] In this embodiment, the first and second arms 151, 152 of
the core 150 are on opposite sides of the heating zone 110. More
specifically, in this embodiment, the first and second arms 151,
152 of the core 150 have respective free ends 151a, 152b on
opposite sides of the heating zone 110. The respective free ends
151a, 152a of the first and second arms 151, 152 of the core 150
face each other through the heating zone 110. Furthermore, in this
embodiment, each of the first and second arms 151, 152 of the core
150 is elongate in a direction parallel to the longitudinal axis
A-A of the heating zone 110.
[0077] In this embodiment, a cross-sectional shape of each of the
first and second arms 151, 152 of the core 150 in a plane normal to
the longitudinal axis A-A of the heating zone 110 is substantially
L-shaped. In other embodiments, the cross-sectional shape may be
other than L-shaped, such as a 45-degree arc or bend. In this
embodiment, each of the first and second arms 151, 152 of the core
150 meets the first portion 155 of the core 150 at substantially
ninety degrees. In other embodiments, this angle may be other than
ninety degrees, such as between 10 and 170 degrees, between 30 and
150 degrees, between 45 degrees and 135 degrees, or between 60 and
120 degrees.
[0078] In this embodiment, the coil 140 is wound around the first
portion 155 of the core 150. In this embodiment, the coil 140 is
wound around neither of the first and second arms 151, 152 of the
core 150. In this embodiment, the coil 140 extends generally along
an axis that is perpendicular to the longitudinal axis A-A of the
heating zone 110. The volume encircled by the coil 140 comprises
the first portion 155 of the core 150 and is free of the heating
zone 110. That is, the coil 140 does not encircle the heating zone
110. Accordingly, some portions of the coil 140 are located between
the first portion 155 of the core 150 and the heating zone 110, and
the first portion 155 of the core 150 is located between some other
portions of the coil 140 and the heating zone 110.
[0079] The apparatus 100 and the article 1 are relatively
dimensioned so that, when the article 1 located is in the heating
zone 110, as shown in FIG. 2, the varying magnetic field generated
by the magnetic field generator 120 penetrates the heater 20 of the
article 1. The geometry of the core 150 and the position of the
core 150 relative to the heating zone 110, and the article 1 in
use, help to direct the magnetic field so as to effect this
penetration of the heater 20. This penetration of the heater 20 is
indicated in FIG. 2 by the arrows M. The arrows M in FIG. 2
represent one instantaneous magnetic field line of the magnetic
field. It can be seen that the magnetic field line follows a path
that extends through the first portion 155 of the core 150, through
the first arm 151 of the core 150 to the free end 151a of the first
arm 151, from the free end 151a of the first arm 151 to the heater
20, through the heater 20, from the heater 20 to the free end 152a
of the second arm 152 of the core 150, and through the second arm
152 to the first portion 155 of the core 150. If the varying
magnetic field is an alternating magnetic field, the direction of
the magnetic field line would reverse repeatedly but still
substantially lie on this path.
[0080] The closer the free ends 151a, 152a of the first and second
arms 151, 152 are to the heater 20 of the article 1, the greater
the proportion of the magnetic field that will be directed through
the heater 20. In some embodiments, the free ends 151a, 152a of the
first and second arms 151, 152 of the core 150 may even contact the
article 1 when the article 1 is located in the heating zone 110.
Moreover, the smaller the surface area of each of the free ends
151a, 152a of the first and second arms 151, 152, the greater the
concentration of the magnetic field passing through them in use.
For example, in some embodiments, the free ends 151a, 152a may be
convex, may be edges of respective tapered portions of the first
and second arms 151, 152, or may comprise one or more surface
features such as ridges or lumps. In some embodiments, the heater
20, or edges thereof, of the article 1 may be suitably shaped to
concentrate the magnetic field passing therethrough.
[0081] Referring to FIG. 3, there is shown a schematic perspective
view of an example of another system according to an embodiment.
The system 2000 comprises an article 2 comprising smokable material
10, and apparatus 200 for heating the smokable material 10 to
volatilize at least one component of the smokable material 10. In
this embodiment, the apparatus 200 is for heating the smokable
material 10 to volatilize at least one component of the smokable
material 10 without burning the smokable material 10.
[0082] In this embodiment, the article 2 is the same as the article
1 of the system 1000 of FIG. 2, albeit rotated through ninety
degrees in FIG. 3, and so will not be described again in detail.
Any of the herein-described possible variations to the article 1 of
FIG. 2 may be made to the article 2 of FIG. 3 to form separate
respective embodiments.
[0083] In this embodiment, the apparatus 200 comprises a heating
zone 110 for receiving the article 2, and the magnetic field
generator 120 shown schematically in FIG. 1. In this embodiment,
the heating zone 110 is a recess in the apparatus 200. Moreover, in
this embodiment, the heating zone 110 is a recess in the core 150.
More specifically, in this embodiment, the recess 110 is elongate
and has a longitudinal axis A-A. Furthermore, although not
expressly shown in FIG. 3, in this embodiment the recess 110 is
cylindrical with a substantially circular cross section in a plane
normal to the longitudinal axis A-A of the recess 110. In other
embodiments, the heating zone 110 may have a cross section other
than circular and/or not be elongate and/or not be cylindrical. In
this embodiment, the article 2 and the recess 110 are relatively
dimensioned so that the article 2 is a snug fit in the recess
110.
[0084] In this embodiment, the core 150 of the magnetic field
generator 120 comprises a magnetically permeable first portion 155,
a magnetically permeable first arm 151, a magnetically permeable
second arm 152, a magnetically permeable third arm 153, and a
magnetically permeable fourth arm 154. The first and third arms
151, 153 extend from a first end 155a of the first portion 155 of
the core 150, and the second and fourth arms 152, 154 extend from a
second end 155b of the first portion 155 of the core 150. The
second end 155b of the first portion 155 is opposite from the first
end 155a of the first portion 155.
[0085] In this embodiment, the first and fourth arms 151, 154 of
the core 150 are on a first side of the heating zone 110, and the
second and third arms 152, 153 are on a second side of the heating
zone 110. The first side of the heating zone 110 is opposite to the
second side of the heating zone 110. The first arm 151 faces the
third arm 153 through the heating zone 110, and the fourth arm 154
faces the second arm 152 through the heating zone 110. Therefore,
the first and second arms 151, 152 of the core 150 are on opposite
sides of the heating zone 110, and the third and fourth arms 153,
154 of the core 150 are on opposite sides of the heating zone 110.
Portions of the heating zone 110 are thus effectively located
between the first and third arms 151, 153 and between the second
and fourth arms 152, 154. In this embodiment, the first portion 155
of the core 150 is elongate in a direction parallel to the
longitudinal axis A-A of the heating zone 110. Furthermore, in this
embodiment, each of the first, second, third and fourth arms 151,
152, 153, 154 of the core 150 is elongate in a direction
perpendicular to the longitudinal axis A-A of the heating zone
110.
[0086] In this embodiment, a cross-sectional shape of the
combination of the first and third arms 151, 153 of the core 150 in
a plane normal to the longitudinal axis A-A of the heating zone 110
is substantially C-shaped. Similarly, in this embodiment, a
cross-sectional shape of the combination of the second and fourth
arms 152, 154 of the core 150 perpendicular to the longitudinal
axis A-A of the heating zone 110 is substantially C-shaped. In
other embodiments, these cross-sectional shapes may be other than
C-shaped. In this embodiment, each of the first, second, third and
fourth arms 151, 152, 153, 154 of the core 150 meets the first
portion 155 of the core 150 at substantially ninety degrees. In
other embodiments, this angle may be other than ninety degrees,
such as between 10 and 170 degrees, between 30 and 150 degrees,
between 45 degrees and 135 degrees, or between 60 and 120
degrees.
[0087] In this embodiment, the coil 140 is wound around the first
portion 155 of the core 150. In this embodiment, the coil 140 is
wound around neither of the first and second arms 151, 152 of the
core 150. In this embodiment, the coil 140 extends generally along
an axis that is parallel to the longitudinal axis A-A of the
heating zone 110. The volume encircled by the coil 140 comprises
the first portion 155 of the core 150 and is free of the heating
zone 110. That is, the coil 140 does not encircle the heating zone
110. Accordingly, some portions of the coil 140 are located between
the first portion 155 of the core 150 and the heating zone 110, and
the first portion 155 of the core 150 is located between some other
portions of the coil 140 and the heating zone 110.
[0088] The apparatus 200 and the article 2 are relatively
dimensioned so that, when the article 2 located is in the heating
zone 110, as shown in FIG. 3, the varying magnetic field generated
by the magnetic field generator 120 penetrates the heater 20 of the
article 2. The geometry of the core 150 and the position of the
core 150 relative to the heating zone 110, and the article 2 in
use, help to direct the magnetic field so as to effect this
penetration of the heater 20. This penetration of the heater 20 is
indicated in FIG. 3 by the arrows M. The arrows M in FIG. 3
represent a few instantaneous magnetic field lines of the magnetic
field. It can be seen that the magnetic field lines follow paths
that extend through the first portion 155 of the core 150, through
the first or third arm 151, 153 of the core 150 to the heater 20,
through the heater 20, from the heater 20 to the second or fourth
arm 152, 14 of the core 150, and through the second or fourth arm
152, 154 to the first portion 155 of the core 150. If the varying
magnetic field is an alternating magnetic field, the direction of
the magnetic field lines would reverse repeatedly but still
substantially lie on these paths.
[0089] The closer the arms 151, 152, 153, 154 of the core 150 are
to the heater 20 of the article 2, the greater the proportion of
the magnetic field that will be directed through the heater 20. In
some embodiments, some or all of the arms 151, 152, 153, 154 of the
core 150 may even contact the article 2 when the article 2 is
located in the heating zone 110.
[0090] In a variation to the embodiment of FIG. 3, the arms 151,
152, 153, 154 of the core 150 may connect the first portion 155 of
the core 150 to a second portion of the core 150. The second
portion of the core may be on an opposite side of the heating zone
110 from the first portion 155 of the core 150. That is, the arms
151, 152, 153, 154 may not have respective free ends as
illustrated, but instead may all be joined to one another by a
portion of the core 150 similar to the first portion 155 of the
core 150. The core 150 may be symmetrical about a plane that is
parallel to the longitudinal axis of the heating zone 110. In such
an embodiment, the first and second portions of the core 150 and
the first and third arms 151, 153 of the core 150 would define a
first window and the first and second portions of the core 150 and
the second and fourth arms 152, 154 of the core 150 would define a
second window. The longitudinal axis of the heating zone 110 may
extend through one or both of the windows. Moreover, the heating
zone 110 would extend through, or be accessible through, each of
the windows. The magnetic field generator may comprise a second
coil wound around the second portion of the core. In such a
construction, a first set of magnetic field lines may follow the
paths shown in FIG. 3, and a second set of magnetic field lines may
follow paths that extend through the second portion of the core 150
in place of the first portion 155, through the arms 151, 152, 153,
154 and through the heater 20 of the article 2.
[0091] Referring to FIG. 4, there is shown a schematic perspective
view of an example of another system according to an embodiment.
The system 3000 comprises an article 3 comprising smokable material
10, and apparatus 300 for heating the smokable material 10 to
volatilize at least one component of the smokable material 10. In
this embodiment, the apparatus 300 is for heating the smokable
material 10 to volatilize at least one component of the smokable
material 10 without burning the smokable material 10.
[0092] In this embodiment, the article 3 of the system 3000
comprises a mass of smokable material 10, a first heater 20, a
second heater 22, and a cover 30.
[0093] Each of the first and second heaters 20, 22 comprises
heating material that is heatable by penetration with a varying
magnetic field. In this embodiment, the first heater 20 is in the
form of a rod, and the second heater 22 is in the form of a tube
that surrounds a portion of the first heater 20. In this
embodiment, the first heater 20 is within the smokable material 10,
and the second heater 22 surrounds the smokable material 10. Thus,
the smokable material 10 is located between the first and second
heaters 20, 22. In other embodiments, the first and second heaters
20, 22 may take different forms to those illustrated. However, in
various embodiments the first heater 20 is out of contact with the
second heater 22, as is the case in this embodiment.
[0094] The cover 30 of the article 3 encircles the smokable
material 10 and the first and second heaters 20, 22 to help
maintain the relative positions of the smokable material 10 and the
heaters 20, 22. The cover 30 may be made of any suitable material,
such as paper, card, a plastics material, or the like. In other
embodiments, the cover 30 may take a different form or be
omitted.
[0095] In this embodiment, the article 3 is elongate and
cylindrical with a substantially circular cross section in a plane
normal to a longitudinal axis of the article 3. However, in other
embodiments, the article 3 may have a cross section other than
circular and/or not be elongate and/or not be cylindrical. The
article 3 may have proportions approximating those of a
cigarette.
[0096] In this embodiment, the apparatus 300 comprises a heating
zone 110 for receiving the article 3, and a magnetic field
generator. The magnetic field generator comprises all the
components of the magnetic field generator 120 shown schematically
in FIG. 1, as well as a second magnetically permeable core 250 and
a second coil 240 wound around the second core 250, as will be
described in more detail below. The device 160 is for passing a
varying current through the second coil 240. The device 160 is
electrically connected between the electrical power source 130 and
the second coil 240. The electrical connection between the device
160 and the second coil 240 may be in parallel or in series to the
electrical connection between the device 160 and the first coil
140.
[0097] The device 160 may be controllable by the controller 170 to
pass a varying electrical current through one of the first and
second coils 140, 240 independently of passing a varying electrical
current through the other of the first and second coils 140, 240.
For example, the controller 170 may cause an electrical current to
be passed through the first coil 140 for a first period of time,
and to then cause an electrical current to be passed through the
second coil 240 for a second period of time. The second period of
time may commence on expiry of the first period of time. Such
actions may effect progressive heating of the smokable material 10
of the article 3.
[0098] In this embodiment, the heating zone 110 is a recess in the
apparatus 300. More specifically, in this embodiment, the recess
110 has an open first end 111 through which the article 3 is
insertable into the recess 110, a second end 112 opposite the first
end 111, and one or more sides connecting the first and second ends
111, 112. The recess 110 is elongate and has a longitudinal axis
A-A. Furthermore, although not expressly shown in FIG. 4, in this
embodiment the recess 110 is cylindrical with a substantially
circular cross section in a plane normal to the longitudinal axis
A-A of the recess 110. In other embodiments, the heating zone 110
may have a cross section other than circular and/or not be elongate
and/or not be cylindrical. In this embodiment, the article 3 and
the recess 110 are relatively dimensioned so that the article 3 is
a snug fit in the recess 110.
[0099] In this embodiment, the first core 150 of the magnetic field
generator 120 comprises a magnetically permeable first portion 155,
a magnetically permeable first arm 151, and a magnetically
permeable second arm 152. The first arm 151 extends from a first
end 155a of the first portion 155 of the first core 150, and the
second arm 152 extends from a second end 155b of the first portion
155 of the first core 150. The second end 155b of the first portion
155 is opposite from the first end 155a of the first portion
155.
[0100] In this embodiment, the first and second arms 151, 152 of
the first core 150 are on different sides of the heating zone 110.
More specifically, in this embodiment, the first and second arms
151, 152 of the first core 150 have respective free ends 151a, 152b
on different sides of the heating zone 110. In this embodiment, the
first arm 151 of the first core 150 is at the side, or one of the
sides, of the recess 110, and the second arm 152 of the first core
150 is at the second end 112 of the recess 110. More specifically,
the free end 151a of the first arm 151 is at the side, or one of
the sides, of the recess 110, and the free end 152a of the second
arm 152 is at the second end 112 of the recess 110. In this
embodiment, the longitudinal axis A-A of the heating zone 110
passes through the free end 152a of the second arm 152. The
respective free ends 151a, 152a of the first and second arms 151,
152 of the first core 150 face the heating zone 110. This
arrangement helps provide that some magnetic field lines M1 follow
a first path that extends from the first core 150 and into the
first heater 20, whereas other magnetic field lines M2 follow a
second path that extends from the second core 250 and into the
second heater 22. That is, by positioning the second arm 152 at the
second end 112 of the recess 110, magnetic flux is encouraged to
flow from the first core 150 into the first heater 20, rather than
into the second heater 22.
[0101] In this embodiment, a cross-sectional shape of the first arm
151 of the first core 150 parallel to the longitudinal axis A-A of
the heating zone 110 is substantially L-shaped. In other
embodiments, the cross-sectional shape may be other than L-shaped,
such as a 45-degree arc or bend. Further, in this embodiment, a
cross-sectional shape of the second arm 152 of the first core 150
parallel to the longitudinal axis A-A of the heating zone 110 is
substantially C-shaped. In other embodiments, the cross-sectional
shape may be other than C-shaped.
[0102] In this embodiment, the coil 140 is wound around the first
portion 155 of the first core 150. In this embodiment, the coil 140
is wound around neither of the first and second arms 151, 152 of
the first core 150. In this embodiment, the coil 140 extends
generally along an axis that is parallel to the longitudinal axis
A-A of the heating zone 110. The volume encircled by the coil 140
comprises the first portion 155 of the first core 150 and is free
of the heating zone 110. That is, the coil 140 does not encircle
the heating zone 110. Accordingly, some portions of the coil 140
are located between the first portion 155 of the first core 150 and
the heating zone 110, and the first portion 155 of the first core
150 is located between some other portions of the coil 140 and the
heating zone 110.
[0103] The apparatus 300 and the article 3 are relatively
dimensioned so that, when the article 3 is located is in the
heating zone 110, as shown in FIG. 4, the varying magnetic field
generated by the first coil 140 of the magnetic field generator 120
penetrates the first heater 20 of the article 3. The geometry of
the first core 150 and the position of the first core 150 relative
to the heating zone 110, and the article 3 in use, help to direct
the magnetic field so as to effect this penetration of the first
heater 20. This penetration of the first heater 20 is indicated in
FIG. 4 by the arrows M1. The arrows M1 in FIG. 4 represent one
instantaneous magnetic field line of the magnetic field. It can be
seen that the magnetic field line follows a path that extends
through the first portion 155 of the first core 150, through the
first arm 151 of the first core 150 to the first heater 20, through
the first heater 20, from the first heater 20 to the second arm 152
of the first core 150, and through the second arm 152 to the first
portion 155 of the first core 150. If the varying magnetic field is
an alternating magnetic field, the direction of the magnetic field
line would reverse repeatedly but still substantially lie on this
path.
[0104] The magnetically permeable second core 250 comprises a
magnetically permeable first portion 255, a magnetically permeable
first arm 251, and a magnetically permeable second arm 252. The
first arm 251 extends from a first end 255a of the first portion
255 of the second core 250, and the second arm 252 extends from a
second end 255b of the first portion 255 of the second core 250.
The second end 255b of the first portion 255 is opposite from the
first end 255a of the first portion 255.
[0105] In this embodiment, the first and second arms 251, 252 of
the second core 250 are on the same side of the heating zone 110.
In other embodiments, the first and second arms 251, 252 of the
second core 250 may be on different sides of the heating zone 110,
such as opposite sides. Moreover, the first and second arms 251,
252 of the second core 250 have respective free ends 251a, 252a
that face the heating zone 110.
[0106] In this embodiment, a cross-sectional shape of each of the
first and second arms 251, 252 of the second core 250 parallel to
the longitudinal axis A-A of the heating zone 110 is substantially
L-shaped. In other embodiments, the cross-sectional shape may be
other than L-shaped, such as a 45-degree arc or bend.
[0107] In this embodiment, the second coil 240 is wound around the
first portion 255 of the second core 250. In this embodiment, the
second coil 240 is wound around neither of the first and second
arms 251, 252 of the second core 250. In this embodiment, the
second coil 240 extends generally along an axis that is parallel to
the longitudinal axis A-A of the heating zone 110. The volume
encircled by the coil 240 comprises the first portion 255 of the
second core 250 and is free of the heating zone 110. That is, the
second coil 240 does not encircle the heating zone 110.
Accordingly, some portions of the second coil 240 are located
between the first portion 255 of the second core 250 and the
heating zone 110, and the first portion 255 of the second core 250
is located between some other portions of the second coil 240 and
the heating zone 110.
[0108] The apparatus 300 and the article 3 are relatively
dimensioned so that, when the article 3 is located is in the
heating zone 110, as shown in FIG. 4, the varying magnetic field
generated by the second coil 240 penetrates the second heater 22 of
the article 3. The geometry of the second core 250 and the position
of the second core 250 relative to the heating zone 110, and the
article 3 in use, help to direct the magnetic field so as to effect
this penetration of the second heater 22. This penetration of the
second heater 22 is indicated in FIG. 4 by the arrows M2. The
arrows M2 in FIG. 4 represent one instantaneous magnetic field line
of the magnetic field. It can be seen that the magnetic field line
follows a path that extends through the first portion 255 of the
second core 250, through the first arm 251 of the second core 250
to the second heater 22, through the second heater 22, from the
second heater 22 to the second arm 252 of the second core 250, and
through the second arm 252 to the first portion 255 of the second
core 250. If the varying magnetic field is an alternating magnetic
field, the direction of the magnetic field line would reverse
repeatedly but still substantially lie on this path.
[0109] The closer the arms 151, 152, 251, 252 of the first and
second cores 150, 250 are to the first and second heaters 20, 22 of
the article 3, the greater the proportion of the magnetic fields
that will be directed through the first and second heaters 20, 22.
In some embodiments, some or all of the arms 151, 152, 251, 252 of
the cores 150, 250 may even contact the article 3 when the article
3 is located in the heating zone 110. Moreover, the smaller the
surface area of each of the free ends 151a, 152a, 251a, 252a of the
arms 151, 152, 251, 252, the greater the concentration of the
magnetic field passing through them in use. The free ends 151a,
152a, 251a, 252a may take any of the forms discussed above.
[0110] In each of the above-described embodiments, the first
portion 155, 255 of the first or second core 150, 250 is unitary or
integral with each of the first and second arms 151, 152 of that
core 150, 250. However, in some embodiments, the first portion 155,
255 of the first or second core 150 may be non-unitary with, and
fastened to, one or both of the first and second arms 151, 152 of
that core 150, 250.
[0111] In FIGS. 1 to 4, the first and second coils 140, 240 are
shown as having only a few windings. However, in reality, each of
the first and second coils 140, 240 could comprise tens or hundreds
of windings.
[0112] In FIGS. 1 to 4, the heating zone 110 is a recess 110. In
other embodiments, the heating zone 110 may be other than a recess,
such as a shelf, a surface, or a projection, and may require
mechanical mating with the article 1, 2, 3 in order to co-operate
with the article 1, 2, 3. The recess 110 may be defined by the
combination of the core(s) 150, 250 and other, less or
non-magnetically permeable material, such as a housing of the
apparatus 100, 200, 300. The housing may be made, for example, from
a plastics material.
[0113] In some embodiments, an impedance of the coil 140, 240 of
the magnetic field generator 120 is equal, or substantially equal,
to an impedance of the heater 20, 22 in the article 1, 2, 3. If the
impedance of the heater 20, 22 of the article 1, 2, 3 were instead
lower than the impedance of the coil 140, 240, then the voltage
generated across the heater 20, 22 in use may be lower than the
voltage that may be generated across the heater 20, 22 when the
impedances are matched. Alternatively, if the impedance of the
heater 20, 22 of the article 1, 2, 3 were instead higher than the
impedance of the coil 140, 240, then the electrical current
generated in the heater 20, 22 in use may be lower than the current
that may be generated in the heater 20, 22 when the impedances are
matched. Matching the impedances may help to balance the voltage
and current to maximize the heating power generated by the heater
20, 22 of the article 1, 2, 3 when heated in use.
[0114] In each of the embodiments discussed above, the heating
material of the heater 20, 22 is aluminum. However, in other
embodiments, the heating material may comprise one or more
materials selected from the group consisting of: an
electrically-conductive material, a magnetic material, and a
magnetic electrically-conductive material. In some embodiments, the
heating material may comprise a metal or a metal alloy. In some
embodiments, the heating material may comprise one or more
materials selected from the group consisting of: aluminum, gold,
iron, nickel, cobalt, conductive carbon, graphite, plain-carbon
steel, stainless steel, ferritic stainless steel, copper, and
bronze. Other heating material(s) may be used in other embodiments.
In some embodiments, the heating material may be magnetic. It has
also been found that, when magnetic electrically-conductive
material is used as the heating material, magnetic coupling between
the magnetic electrically-conductive material and an electromagnet
of the apparatus in use may be enhanced. In addition to potentially
enabling magnetic hysteresis heating, this can result in greater or
improved Joule heating of the heating material, and thus greater or
improved heating of the smokable material 20.
[0115] In each of the articles 1, 2, 3 shown in FIGS. 2 to 4, the
heating material of the heater 20, 22 is in contact with the
smokable material 10. Thus, when the heating material is heated by
penetration with a varying magnetic field, heat may be transferred
directly from the heating material to the smokable material 10. In
other embodiments, the heating material may be kept out of contact
with the smokable material 10. For example, in some embodiments,
the article 1, 2, 3 may comprise a thermally-conductive barrier
that is free of heating material and that spaces the heating
material from the smokable material 10. In some embodiments, the
thermally-conductive barrier may be a coating on the heating
material. The provision of such a barrier may be advantageous to
help to dissipate heat to alleviate hot spots in the heating
material.
[0116] In each of the embodiments discussed above, the heating
material may have a skin depth, which is an exterior zone within
which most of an induced electrical current and/or induced
reorientation of magnetic dipoles occurs. By providing that the
component comprising the heating material has a relatively small
thickness, a greater proportion of the heating material may be
heatable by a given varying magnetic field, as compared to heating
material in a component having a depth or thickness that is
relatively large as compared to the other dimensions of the
component. Thus, a more efficient use of material is achieved. In
turn, costs are reduced.
[0117] In some embodiments, a component comprising the heating
material may comprise discontinuities or holes therein. Such
discontinuities or holes may act as thermal breaks to control the
degree to which different regions of the smokable material 10 are
heated in use. Areas of the heating material with discontinuities
or holes therein may be heated to a lesser extent that areas
without discontinuities or holes. This may help progressive heating
of the smokable material 10, and thus progressive generation of
vapor, to be achieved. Such discontinuities or holes may, on the
other hand, be used to optimize the creation of complex eddy
currents in use.
[0118] In each of the above described embodiments, the smokable
material 10 comprises tobacco. However, in respective variations to
each of these embodiments, the smokable material 10 may consist of
tobacco, may consist substantially entirely of tobacco, may
comprise tobacco and smokable material other than tobacco, may
comprise smokable material other than tobacco, or may be free of
tobacco. In some embodiments, the smokable material 10 may comprise
a vapor or aerosol forming agent or a humectant, such as glycerol,
propylene glycol, triacetin, or diethylene glycol.
[0119] In each of the above described embodiments, the article 1,
2, 3 is a consumable article. Once all, or substantially all, of
the volatilizable component(s) of the smokable material 10 in the
article 1, 2, 3 has/have been spent, the user may remove the
article 1, 2, 3 from the apparatus 100, 200, 300 and dispose of the
article 1, 2, 3. The user may subsequently re-use the apparatus
100, 200, 300 with another of the articles 1, 2, 3. However, in
other respective embodiments, the article 1, 2, 3 may be
non-consumable, and the apparatus 100, 200, 300 and the article 1,
2, 3 may be disposed of together once the volatilizable
component(s) of the smokable material 20 has/have been spent.
[0120] In some embodiments, the apparatus 100, 200, 300 is sold,
supplied or otherwise provided separately from the articles 1, 2, 3
with which the apparatus 100, 200, 300 is usable. However, in some
embodiments, the apparatus 100, 200, 300 and one or more of the
articles 1, 2, 3 may be provided together as a system 1000, 2000,
3000, such as a kit or an assembly, possibly with additional
components, such as cleaning utensils.
[0121] In some embodiments, the apparatus 100, 200, 300 may
comprise a heater comprising heating material that is heatable by
penetration with a varying magnetic field. The core(s) may be
shaped so as to encourage the flow of magnetic flux through the
heater of the apparatus 100, 200, 300. Such a heater of the
apparatus 100, 200, 300 may, for example, comprise a tubular heater
that defines the heating zone 110. In some such embodiments, the
article 1, 2, 3 may be free of heating material, and the smokable
material may be heated by heat transferred from the heater of the
apparatus 100, 200, 300.
[0122] Embodiments could be implemented in a system comprising any
one of the articles discussed herein, and any one of the
apparatuses discussed herein, wherein the apparatus itself has
heating material, such as in a susceptor, for heating by
penetration with the varying magnetic field generated by the
magnetic field generator. Heat generated in the heating material of
the apparatus could be transferred to the article to heat, or
further heat, the smokable material therein when the article is in
the heating zone.
[0123] In order to address various issues and advance the art, the
entirety of this disclosure shows by way of illustration and
example various embodiments in which that which is claimed may be
practiced and which provide for superior apparatus for heating
smokable material to volatilize at least one component of the
smokable material, and superior systems comprising such apparatus
and articles for use with such apparatus. The advantages and
features of the disclosure are of a representative sample of
embodiments only, and are not exhaustive and/or exclusive. They are
presented only to assist in understanding and teach the claimed and
otherwise disclosed features. It is to be understood that
advantages, embodiments, examples, functions, features, structures
and/or other aspects of the disclosure are not to be considered
limitations on the disclosure as defined by the claims or
limitations on equivalents to the claims, and that other
embodiments may be utilized and modifications may be made without
departing from the scope and/or spirit of the disclosure. Various
embodiments may suitably comprise, consist of, or consist in
essence of, various combinations of the disclosed elements,
components, features, parts, steps, means, etc. The disclosure may
include other inventions not presently claimed, but which may be
claimed in future.
* * * * *