U.S. patent number 3,711,805 [Application Number 05/142,212] was granted by the patent office on 1973-01-16 for high-frequency coil having a synthetic resin base.
This patent grant is currently assigned to U.S. Philips Corporation. Invention is credited to Alphonsus Jozephus Cornelus Heijnen, Hendrikus Wilhelmus Antonius van Oorschot.
United States Patent |
3,711,805 |
Heijnen , et al. |
January 16, 1973 |
HIGH-FREQUENCY COIL HAVING A SYNTHETIC RESIN BASE
Abstract
A small high frequency coil having a synthetic resin base with a
plurality of parallel grooves which extend to the lower surface of
the base and to one side face thereof. Each groove contains a
wire-shaped connecting contact with a portion thereof embedded in
the base whereas a second portion is partly contained within the
groove and protrudes from said one side face. The second portion of
the wire-shaped contact is adapted to be bent at right angles to a
position in which it protrudes from the lower surface of the base.
The coil can be conveniently mounted on a printed circuit board
with the coil axis either parallel or perpendicular to the
board.
Inventors: |
Heijnen; Alphonsus Jozephus
Cornelus (Emmasingel, Eindhoven, NL), Oorschot;
Hendrikus Wilhelmus Antonius van (Emmasingel, Eindhoven,
NL) |
Assignee: |
U.S. Philips Corporation (New
York, NY)
|
Family
ID: |
19810169 |
Appl.
No.: |
05/142,212 |
Filed: |
May 11, 1971 |
Foreign Application Priority Data
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|
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May 28, 1970 [NL] |
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7007686 |
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Current U.S.
Class: |
336/65; 336/192;
336/136 |
Current CPC
Class: |
B26B
19/38 (20130101); H01F 27/027 (20130101); B26B
19/102 (20130101); B26B 19/3886 (20130101); B26B
19/3873 (20130101); H01F 2005/046 (20130101); Y10T
74/18992 (20150115) |
Current International
Class: |
B26B
19/38 (20060101); B26B 19/10 (20060101); B26B
19/04 (20060101); H01F 27/02 (20060101); H01f
015/02 (); H01f 015/10 () |
Field of
Search: |
;336/65,192,198,208,136 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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|
|
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1,226,209 |
|
Oct 1966 |
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DT |
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611,347 |
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Sep 1948 |
|
GB |
|
Primary Examiner: Kozma; Thomas J.
Claims
What is claimed is:
1. A high-frequency coil comprising a winding supported on the
upper side of a synthetic resin base member having two opposite
side faces and provided with a plurality of wire-shaped connecting
contacts which also serve for mounting the base on a printed
circuit board, the base of the coil including a plurality of
approximately parallel grooves at the lower side which terminate at
one end at one of said two opposite side faces, the other end of
the grooves being situated inside the base, each groove containing
a wire-shaped contact with each wire-shaped contact having a first
portion partly contained within one of said grooves in which it is
a tight fit and from which it protrudes in part, the protruding
part serving as a soldering tag for making external connections
whereas the remaining portion of the wire-shaped contact extends in
line with the bottom of the groove and is embedded in the material
of the base with an end portion protruding from the second one of
said two opposite side faces, and the coil winding being connected
to said protruding end portion.
2. A high-frequency coil as claimed in claim 1, wherein said first
portion of each contact is adapted to be bent into a position at
right angles to said remaining portion and wherein the length and
the depth of the grooves are chosen such that the tag parts of the
wire-shaped connecting contacts contained therein protrude equally
far from the base, both in the straight condition and in the
condition where they are bent at right angles around the material
of the base.
3. A high-frequency coil as claimed in claim 1 further comprising a
coil former composed of synthetic resin extending perpendicular to
the base and having a pair of flanges, one of said flanges forming
an integral unit with the base, around which a ferrite frame which
serves as a magnetic yoke is provided, characterized in that the
edge of said one flange of the coil former coheres with an
elevation member formed on a portion of the base member so as to
provide a space between the one flange and the coil base, and means
securing one side of the ferrite frame within said space.
4. A high frequency coil as claimed in claim 3 wherein said first
portion of each contact is adapted to be bent into a position at
right angles to said remaining portion and wherein the length and
depth of the grooves are arranged so that the tag parts of the
wire-shaped contacts protrude the same distance from the base in
either the straight or bent position thereof.
5. A high-frequency coil comprising a coil former with a base
member for mounting the coil to a board and having a pair of
opposed side walls, a winding mounted on the coil former with its
axis perpendicular to the base member, a plurality of parallel
grooves located in the bottom surface of the base member and
extending perpendicular to the coil axis, said grooves extending
from a first one of said side walls to a point inside the base
member, a plurality of wire-shaped contacts each located with a
first part in a respective groove and one end protruding from said
one side wall for making external connections thereto and a second
part in line with its respective groove and totally embedded within
the base member with a second end protruding from the other of said
side walls to provide a connecting terminal for said winding, said
first part of each contact being adapted to be bent into a position
perpendicular to the second part so as to protrude from said bottom
surface of the base.
6. A coil as claimed in claim 5 wherein said grooves are
dimensioned so that said one end of the wire-shaped contacts
protrude substantially the same distance from the side wall and the
bottom surface of the base member in the in-line and bent
positions, respectively, of the contacts.
7. A coil as claimed in claim 6 wherein said coil former extends
perpendicular to the base member and includes a flange that is an
integral unit with the base member and forms a recess with a part
of the base member, and a magnetic yoke frame member with one end
located within said recess.
8. A coil as claimed in claim 6 further comprising a cylindrical
ferrite core axially movable within said coil former to adjust the
inductance of the coil.
9. A coil as claimed in claim 6 wherein said base member has a
generally rectangular shape and is composed of a synthetic resin
material.
Description
This invention relates to a high-frequency coil having a base made
of synthetic resin and wire-shaped connecting contacts which also
serve for mounting on a printed-circuit board. The object of the
invention is to provide a construction which is suitable for
inexpensive series manufacture and which can be mounted on a
printed-circuit board with the coil axis both parallel to and
perpendicular to said board.
According to the invention we provide a high frequency coil with a
winding supported on the upper side of a base of synthetic resin
having two opposite side faces and being provided with wire-shaped
connecting contacts which also serve for mounting the base on a
printed circuit board. In accordance with the desired mounting
position, the portions serving as soldering tags may be straight or
may be bent at right angles. The length and depth of the grooves
are preferably chosen such that the wire-shaped connecting contacts
contained therein protrude equally far from the base, both in the
straight condition and in the condition where they are bent at
right angles around the material of the base.
In order that the invention may be readily carried into effect, one
embodiment thereof will now be described in detail, by way of
example, with reference to the accompanying drawing, in which:
FIG. 1 is a side elevation and partly a vertical cross-sectional
view of one embodiment, and
FIGS. 2 and 3 are another side elevation and a horizontal
cross-sectional view, respectively, of the same device.
In a plan view (FIG. 3) the high frequency coil shown has a
rectangular insulating base 1 made of synthetic resin which is
provided at the lower side with generally parallel grooves 3 which
extend perpendicular to the left-hand side face 4 (FIG. 1) of the
base, their open left-hand ends terminating in this face. In the
right-hand direction in FIG. 1 the grooves 3 terminate within the
base 1. The coil has a number of wire-shaped connecting contacts 5
which are embedded into the material of the base 1 over a portion
of their length. The embedded portion 5a of each of the contacts 5
is situated in line with the bottom portion (upper portions in
FIGS. 1 and 2) of one of the grooves 3.
The coil is preferably manufactured with straight connecting
contacts 5, as shown in FIG. 1, for mounting on a printed-circuit
board engaging the left-hand side face 4 of the base. However, by
using a suitable bending jig, it is readily possible to bend the
portions 5b of the contacts 5, situated to the left of the embedded
portions 5a in FIG. 1, around the material portion of the base 1,
denoted by reference numeral 1a, at right angles for mounting as a
soldering tag on a horizontal printed-circuit board 7 (denoted by
broken lines in FIG. 1), as shown in broken lines by the bent-over
position 5c. The depth and the length of each of the grooves 3 is
chosen such that the connecting contact 5 protrudes in both
positions approximately equally far -- i.e. over the most suitable
length for mounting -- outside the base 1. The width of the groove
3 is approximately equal to the thickness of the connecting contact
5 so that the contact, which is bent at right angles, is a tight
fit and cannot pivot around the embedded portion 5a.
The straight end (FIG. 1) of the contact portion 5a protrudes
outside the base 1 from the side face of the base 1 opposite to
side face 4, and serves as a connecting point for one or more wire
lead-outs 9 of the coil winding 11. This winding (not shown in the
FIGS. 2 and 3) is accommodated on a coil former 13 extending
perpendicular to the base 1 and having two flanges 15 and 17, which
coil former has been moulded to form an internal unit with the base
1. The edge of the lower flange 17 coheres with an elongated
elevation 19 which is formed on the base 1 above the row of
embedded wire portions 5a. Between the flange 17 and the base 1 a
space is left in which fits one side of a rectangular frame 21 of
ferrite which is secured, for example, by gluing. This frame serves
as a magnetic termination or yoke for the coil and has an opening
22 in the lower and in the upper side to allow passage of a
preferably smooth cylindrical ferrite pin 21, which serves as an
adjustable core for the coil. This pin is rotatable and vertically
displaceable with some friction inside the former 13, as a
resilient tag 25 is formed on the inside thereof which resiliently
engages the pin 23. The displacement may be effected by a helical
movement imparted to the core pin by means of a screw-driver
engaging into a groove 27 which is formed in a synthetic resin head
29 secured to the upper end of the pin 23.
* * * * *