U.S. patent number 3,914,548 [Application Number 05/447,333] was granted by the patent office on 1975-10-21 for stylus actuated electrical device and electrical kit including same.
Invention is credited to Benjamin J. Barish.
United States Patent |
3,914,548 |
Barish |
October 21, 1975 |
Stylus actuated electrical device and electrical kit including
same
Abstract
Described is a stylus-actuated electrical device including a
printed circuit board and an overlying flexible impression sheet,
both carrying an electrically conductive pattern. The two
conductive patterns are normally insulated from each other by a
coating of a soft, pressure-flowable, tacky, insulating material,
such as wax. When "writing" with a stylus, portions of the two
conductive patterns are brought into contact with each other along
the line of write, which contact is broken by separation of the
impression sheet, as in a "Magic Slate" device. Both conductive
patterns are in the form of discrete conductive deposits each
insulated from the others on all sides by narrow interruptions,
such that a conductive pathway is formed by the successive
electrical contacts between the conductive patterns of the two
members under the pressure of the stylus, the conductive deposits
of one member bridging the interruptions of the other along the
line of movement of the stylus. Also described is a kit including
the stylus-actuated electrical device and a plurality of
selectively insertable electrical components enabling various
electrical circuits to be produced in a simple manner by drawing
same with a stylus, and to be erased in an even simpler manner by
merely separating the impression sheet from the printed circuit
board.
Inventors: |
Barish; Benjamin J. (36 Yehuda
Hanassi St., IL) |
Family
ID: |
27270653 |
Appl.
No.: |
05/447,333 |
Filed: |
March 1, 1974 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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265985 |
Jun 26, 1972 |
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Foreign Application Priority Data
Current U.S.
Class: |
178/18.06;
346/21 |
Current CPC
Class: |
G06F
3/0414 (20130101) |
Current International
Class: |
G06F
3/033 (20060101); G11c 005/02 (); G09b
023/18 () |
Field of
Search: |
;35/9C,19A,61,62,63,66
;178/18,19,20 ;339/18R,18B,18C,18P ;235/61.11H,61.12C ;346/21 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Robinson; Thomas A.
Parent Case Text
RELATED PATENT APPLICATIONS
The present application is a continuation-in-part of my copending
U.S. Pat. application No. 265,985 filed June 26, 1972 for "Stylus
Actuated Electrical Devices", which application, now abandoned, was
replaced by continuation application No. 490,682 filed July 22,
1974.
Claims
What is claimed is:
1. An electrical device comprising a supporting member carrying at
least one electrically conductive element, and a flexible sheet
member carrying at least one electrically conductive element
placeable on top of the supporting member with the two conductive
elements facing each other, at least one of said members including
a coating of insulating material to insulate the conductive
elements from each other when the flexible sheet member is placed
on top of the supporting member, said insulating coating being of a
soft, pressure-flowable material which parts under the pressure of
a stylus applied to the flexible sheet member to thereby bring the
two conductive elements into contact with each other, said
insulating coating also being tacky to hold the two conductive
elements in contact with each other upon removing the pressure of
the stylus, said conductive elements on both of said members being
in the form of discrete conductive deposits insulated from the
others on all sides by narrow interruptions between them, such that
a conductive pathway is formed along the line of the stylus
pressure by the successive electrical contacts between the
conductive deposits of the two members, the conductive deposits of
one member bridging the interruptions of the other along the line
of movement of the stylus, said conductive pathway being erasable
by the separation of the two members.
2. An electrical device as defined in claim 1, wherein said
supporting member is a printed circuit board.
3. An electrical device as defined in claim 1, wherein said
insulating coating comprises wax.
4. An electrical device as defined in claim 1, wherein the discrete
conductive deposits are of polygonal shape, the deposits of one
member being rotationally displaced to the deposits of the other
member.
5. An electrical device as defined in claim 1, further including a
plurality of electrical terminals carried by the supporting member
for connection to electrical components each of said terminals
being connected to one of said conductive deposits of the
supporting member enabling electrical circuits to be traced by the
stylus to various component terminals.
6. An electrical device as defined in claim 5, wherein said
electrical terminals are uniformly spaced connectors for removably
receiving various electrical components in selected arrangements to
enable different electrical circuits to be produced with them by
the stylus.
7. A kit including the electrical device as defined in claim 6, and
a plurality of electrical components having uniformly spaced
electrical terminals according to the uniform spacing of the
connectors in said electrical device, said components being
selectively receivable in the connectors in various arrangements to
enable different electrical circuits to be produced with them by
the stylus.
8. A kit as defined in claim 7, wherein the supporting member is a
printed circuit board and is surrounded on at least three sides by
said connectors for receiving the electrical components.
9. A kit including a supporting member, a stylus-actuated device
enabling various electrically conductive pathways to be formed by a
stylus, a plurality of electrical components having uniformly
spaced terminals, and a plurality of electrical connectors on the
supporting member and uniformly spaced from each other according to
the uniform spacing of the terminals on the electrical components,
for removably receiving electrical components in various
arrangements to enable different electrical circuits to be produced
therewith by the stylus-actuated device.
10. A kit as defined in claim 9, wherein the stylus-actuated device
comprises a supporting member carrying at least one electrically
conductive element, and a flexible sheet member carrying at least
one electrically conductive element placeable on top of the
supporting member with the two conductive elements facing each
other, at least one of said members including a coating of
insulating material to insulate the conductive elements from each
other when the flexible sheet member is placed on top of the
supporting member, said insulating coating being of a soft,
pressure-flowable material which parts under the pressure of a
stylus applied to the flexible sheet member to thereby bring the
two conductive elements into contact with each other, said
insulating coating also being tacky to hold the two conductive
elements in contact with each other upon removing the pressure of
the stylus, said conductive elements on both of said members being
in the form of discrete conductive deposits insulated from the
others on all sides by narrow interruptions between them, such that
a conductive pathway is formed along the line of the stylus
pressure by the successive electrical contacts between the
conductive deposits of one member bridging the interruptions of the
other along the line of movement of the stylus, said conductive
pathway being erasable by the separation of the two members.
Description
BACKGROUND OF THE INVENTION
The present invention relates to a stylus-actuated electrical
device, and also to an electrical kit including such device.
In my co-pending U.S. Pat. application Ser. No. 265,985 filed June
26, 1972 (now abandoned and replaced by continuation application
No. 490,682, filed July 22, 1974, as noted above), there is
disclosed an electrical device actuatable by the pressure of a
stylus in a manner somewhat resembling the mode of operation of the
well-known "Magic Slate." Briefly, the device includes a supporting
member, such as a printed circuit board, carrying one or more
electrically-conductive elements, and a flexible impression sheet
carrying other electrically-conductive elements placeable on top of
the supporting member with the conductive elements of both facing
each other. A coating of wax (or other equivalent material), on one
or both of the members insulates the conductive elements from each
other. Under the pressure of a stylus, however, the wax parts
thereby bringing the conductive elements of the flexible sheet into
contact with the conductive elements of the printed circuit board.
The wax coating, being tacky, maintains the electrical contact when
the stylus is removed, but the contact is easily broken by
separation of the flexible impression sheet from the printed
circuit board.
The above-cited patent application describes a number of
stylus-actuated electrical devices operating in accordance with the
above principle, including an electrical switching device, a
graphic input device, and a stylus-actuated display system.
BRIEF SUMMARY OF THE PRESENT INVENTION
The present invention describes new forms and applications of such
stylus-actuated electrical devices.
According to one aspect of the present invention, the conductive
elements on both the supporting member and the overlying flexible
sheet member are in the form of discrete conductive deposits each
insulated from the others on all sides by narrow interruptions.
When used as described above, a conductive pathway is formed along
the line of write of the stylus by the successive electrical
contacts between the conductive deposits of the two members, the
conductive deposits of one bridging the interruptions of the other
along the line of movement of the stylus. This conductive pathway
is maintained by the tacky nature of the insulating coating, but is
easily erased by merely separating the flexible sheet from the
supporting member.
Preferably, the supporting member is a printed circuit board.
According to a further feature, the device includes a plurality of
electrical terminals carried by the supporting member for
connection to various types of electrical components, the terminals
being connected to some of the conductive deposits of the
supporting member, thereby enabling electrical circuits to be
traced by the stylus to the various component terminals.
A device is thus provided in which any desired conductive pathway
may be easily traced by a stylus to selected terminals, and may
just as easily be erased by merely separating the overlying
impression sheet, from the supporting member. Such a device may be
used in many applications.
One described application is an instruction or assembly kit in
which the terminals are in the form of uniformly spaced connectors
(e.g. sockets) for removably receiving various electrical
components in selected arrangements. The stylus-actuated device
enables different electrical circuits to be produced with these
components by merely tracing the desired circuit with the stylus,
and when it is desired to trace a new circuit, the device can be
erased by merely separating the impression sheet from the
supporting member.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is herein described, by way of example only, with
reference to the accompanying drawings, wherein:
FIG. 1 is a sectional view of the two main elements in one form of
stylus-actuated electrical device constructed in accordance with
the invention;
FIG. 2 is a view similar to that of FIG. 1 illustrating how a
conductive pathway is formed by the use of the stylus;
FIG. 3 is a plan view of the conductive pattern on the printed
circuit board in the device of FIG. 1;
FIG. 4 is a plan view of the conductive pattern on the overlying,
flexible impression sheet in the device of FIG. 1;
FIG. 5 illustrates the various elements of the assembly of FIG. 1,
with part of the insulating coating stripped away from the
impression sheet;
FIG. 6 illustrates how the interruptions of the conductive deposits
on one member are bridged by the conductive deposits of the other
when tracing the conductive pathway with the stylus; and
FIG. 7 illustrates a circuit assembly kit constructed in accordance
with the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The basic device illustrated in FIGS. 1-5 of the drawings comprises
a supporting member, generally designated 2, and a flexible
impression sheet applied thereover, generally designated 4.
Supporting member 2 is in the form of a printed circuit board
including a rigid insulating base 5 carrying on its upper surface a
conductive pattern including a plurality of discrete conductive
deposits 6 each insulated from the others on all sides by narrow
interruptions 8. The overlying flexible impression sheet 4
comprises a plastic sheet or film 10 carrying on one face another
conductive pattern of discrete conductive deposits 12 each
insulated from the others on all sides by narrow interruptions 14.
The outer face of conductive deposits 12 on sheet 10 are covered by
a layer of wax 16.
The conductive deposits 6 and 12 may each be applied by
conventional printed circuit techniques, such as by forming a
continuous metal coating on the respective members, and then
etching away the portions forming the interruptions. Very small
interruptions can thus be formed in a very simple and inexpensive
procedure.
As shown in FIG. 2, when a stylus is pressed against the overlying
impression sheet 4, it causes the wax coating 16 to part along the
line of write of the stylus, thereby bringing the conductive
deposits 12 of the impression sheet 4 into contact with the
conductive deposits 6 of the printed circuit board 2 along the line
of write of the stylus. The soft tacky nature of the wax coating 16
holds the conductive deposits in contact with each other upon
removing the pressure of the stylus, but the electrical contact
between these deposits is easily interruptable by merely separating
the flexible sheet 4 from the printed circuit board, as in a "Magic
Slate" device.
It will be appreciated that wax coating 16 could be applied on top
of conductive deposits 6 on the printed circuit board 2 in lieu of,
or in addition to, its being applied over conductive deposits 12 on
the impression sheet 4. It will also be appreciated that other
insulating coating materials could be used which are soft,
pressure-flowable so as to part under the pressure of the stylus to
bring the conductive deposits into contact with each other, and
tacky so as to hold the conductive deposits in contact with each
other upon removing the pressure of the stylus until the impression
sheet is separated from the printed circuit board.
FIG. 3 illustrates the printed circuit board 2 including the
pattern of the conductive deposits 6 formed on its upper surface.
In this example, the conductive deposits are of rectangular or
square shape, and are separated from each other on all sides by
narrow interruptions 8. These interruptions are somewhat
exaggerated in the drawings, and in practice should be as narrow as
possible, consistent with printed circuit techniques.
FIG. 4 illustrates the pattern of the conductive deposits 12 formed
on the overlying flexible impression sheet 4. The conductive
deposits 12 on this sheet are also of rectangular or square shape,
with each separated from the other on all sides by interruptions 14
which are as narrow as possible consistent with printed circuit
techniques.
In use, the flexible impression sheet 4 is applied over the printed
circuit board 2 as shown in FIG. 5, with the conductive deposits 6
of the board and the conductive deposits 12 of the impression sheet
facing each other. The layer of wax 16 on the flexible impression
sheet normally insulates the conductive deposits from each other.
However, when the stylus 20 (FIG. 2) is pressed against the
flexible impression sheet 4, the wax coating 16 is caused to part
along the line of write of the stylus, thereby bringing conductive
deposits 12 of the impression sheet into direct physical contact
with conductive deposits 6 of the printed circuit board along the
line of write. The physical contacts between the conductive
deposits are maintained even after the stylus has been removed by
virtue of the tacky nature of the wax coating 16, as in a
"Magic-Slate" device.
As shown in FIGS. 2 and 6, a conductive pathway is formed along the
line of movement of the stylus by the successive electrical
contacts between the conductive deposits of the two members, the
conductive deposits 12 of sheet 4 bridging the interruptions 8 of
board 2, and the conductive deposits 6 of board 2 bridging the
interruptions 14 of sheet 4. This is particularly shown in FIG. 6,
wherein it will be seen that each conductive deposit 12 (shown in
broken lines) on the impression sheet 4 overlies a portion of
several conductive deposits 6 (shown in full lines) on the printed
circuit board 2 and bridges the interruptions 8 between them. The
same applies with respect to conductive deposits 6 on the printed
circuit board, which deposits bridge the interruptions 14 between
the conductive deposits 12 of the flexible impression sheet 4. The
interruptions 8 and 14 between the conductive deposits on both
members should be as narrow as possible, as mentioned earlier, and
in any event should be substantially narrower than the thickness of
the line drawn by the stylus 20, which will thereby assure that the
line drawn by the stylus will always bridge the interruptions
between adjacent conductive deposits along the line of write of the
stylus.
It will be noted that the conductive deposits 6 on the printed
circuit board 2 (FIG. 3) are arranged in horizontal rows and
vertical columns, whereas conductive deposits 12 on the impression
sheet 4 (FIG. 4), are arranged in rows and columns rotationally
displaced so as to be at a bias or angle (e.g. about 45.degree.) to
the rows and columns of deposits 6. This is a preferred arrangement
to minimize the possibility of an interruption 8 on the printed
circuit board 2 exactly becoming aligned with an interruption 14 on
the flexible impression sheet 4 when the latter is applied over the
printed circuit board as shown in FIG. 5. It will be appreciated,
however, that other configurations of deposits, other arrangements
of deposits on the respective supporting member, and other
relationships of the deposits of one supporting member with respect
to the other, may be used.
It will thus be seen that the device illustrated in FIGS. 1-6
enables any conductive pathway to be produced by merely pressing
stylus 20 against the outer face of impression sheet 4 and moving
same to trace the desired conductive pathway; and that the pathway
is produced by the successive electrical contacts between the
conductive deposits of members 2 and 4, the deposits of one
bridging the interruptions of the other along the line of movement
of the stylus. It will further be seen that, as in a "Magic Slate"
device, the so drawn conductive pathway is maintained even after
removal of the stylus but may easily be erased by merely separating
the impression sheet 4 from the printed circuit board 2.
Such a device may have a large number of applications. One
application is shown in FIG. 7.
FIG. 7 illustrates a circuit assembly kit including the device of
FIGS. 1-6, which kit enables various circuits to be assembled by
merely inserting selected electrical components, and drawing the
necessary conductive pathways to the various components to complete
the circuit. The circuit is retained as long as desired and may be
easily erased, whenever a new circuit is to be assembled, by merely
separating the flexible impression sheet 4 from the printed circuit
board 2.
The kit of FIG. 7 includes a holder, generally designated 30,
including the printed circuit board 2 occupying its center and
surrounded by a marginal surface 32 around its four sides. The
overlying impression sheet 4 is placed on top of the printed
circuit board 2 in the manner described earlier, namely with
conductive deposits 12 of the impression sheet facing the
conductive deposits 6 of the printed circuit board but separated
therefrom by the insulated coating 16 (e.g. FIGS. 1 and 5).
The exact positioning of the flexible impression sheet 4 with
respect to the printed circuit board 2 is not critical since the
interruption 8 and 14 between the respective conductive deposits,
being substantially narrower than the line produced by the stylus,
will always be bridged by the latter lines.
The flexible impression sheet 4 may be held in place over the
printed circuit board 2 in any suitable manner. For purposes of
example, FIG. 7 illustrates an elongated clamping member 34
releasably secured at both ends by fasteners 36 for clamping the
impression sheet 4 over the printed circuit board 2. Clamp 34
extends only along one edge of the impression sheet so that the
remaining three edges are free to permit the impression sheet to be
lifted in order to erase the conductive pathways formed.
The marginal area 32 of holder 30 includes a plurality of connector
sockets 40 which are equally and uniformly spaced from each other.
Each connector socket 40 is connected by a conductive strip 42 to
one of the conductive deposits 6 of the printed circuit board
2.
The kit illustrated in FIG. 7 further includes a plurality of
electrical components each having pins 44 receivable within sockets
40. Many different types of electrical components would normally be
provided in the kit. A number of such components are schematically
illustrated in the drawings and referred to below. Some of these
components include two terminals, and some include three (and
possibly four or more). In any event, the pins 44 on all the
components are equally spaced, the spacing corresponding to that
between the sockets 40 on the printed circuit board, so that
different electrical components can be selectively inserted into
various ones of the sockets 40 on the printed circuit board
according to the electrical circuit to be assembled. A modular
construction is thus produced providing a high degree of
selectivity and interchangeability of components that may be
included in the electrical circuit.
FIG. 7 illustrates only one of each of the various components, but
it will be appreciated that a kit will normally include a plurality
of most or all of such components, to enable assembling circuits
including more than one of each type of component.
For purposes of example, FIG. 7 illustrates a resistor R, a
capacitor C, a coil L, a battery B, a diode D, and a lamp M. A
ground G could be permanently provided in the circuit board.
Further components that may be included are a switch S, a
transistor T, and various logical elements, such as an AND-gate A,
an OR-gate O, and an Inverter I.
Still further components (not shown) may be included, such as a
bell to sound an alarm, a light-emitting diode to indicate the
presence of a voltage, a meter to measure voltage or current, a
voltage-divider having a movable tap, and the like.
Because of the modular construction, including the uniform spacing
of the sockets 40 of the printed circuit board and the pins 44 of
the electrical components (whether they be of the two-terminal,
three-terminal, or more-terminal type), it will be seen that an
almost unlimited number of different component arrangements may be
inserted into the holder, and therefore an almost unlimited number
of circuits may be drawn with the stylus.
Since the terminals 44 of the electrical components are connected
via sockets 40 and conducting strips 42 to conductive deposits 6 of
the printed circuit board, any desired conductive pathway may be
produced by tracing with the stylus in the manner described above
to form the electrical connections to the various components. Thus,
if it is desired to connect one side of battery B to ground G, for
example, it is only necessary to move the stylus to trace a path
from the conductor strip 42 (or a conductive deposit to which it is
connected) on the side of the battery to be grounded, to the
conductive strip 42 of ground G. Terminals of other components may
be similarly connected by drawing a line to the ground G conductive
strip 42, or by drawing a line intercepting such a line.
In a similar manner, the terminals of the other electrical
components may be connected together in any desired relationship by
merely drawing the appropriate connection lines with the
stylus.
The provision of a switch S is desirable, since it enables a
circuit to be drawn but not to be completed until the switch is
depressed. The provision of a lamp M or other indicator is also
desirable since it enables the user to visually see the results of
a connection. The provision of the logical elements (A, O and I)
enables the respective logical functions to be demonstrated.
Logical elements could be included having more than the illustrated
two inputs.
Substantially no wear occurs with respect to the printed circuit
board 2 and its conductors 6, but if and when the overlying
impression sheet 4 wears out, it may be easily replaced by merely
releasing clamp 34 and then inserting a new impression sheet. This
is one of the advantages in including the wax coating 16 on the
impression sheet 4.
The orientation of the impression sheet 4 with respect to the
printed circuit board 2 is not critical, as mentioned earlier, but
it is important that the interruptions 8 and 14 between the
conductive deposits on the two members be as narrow as possible,
and in any event, narrower than the thickness of the line drawn by
the stylus. Further, the dimensions of the conductive deposits 6
and 12 are also not critical, but the larger they are, the greater
will be the required spacing between the lines drawn by the stylus
to avoid undesired electrical connections between drawn lines.
While the insulating coating 16 has been described above as being
of wax and as being applied to the flexible impression sheet 4, it
will be appreciated that it could be of other insulating material
which is soft, pressure-flowable, and tacky (for example soft
polyisobutylene, polyvinyl acetate, polyethyelene resins, or
mixtures thereof with wax) and that such a coating could be applied
over the conductive deposits 6 on the printed circuit board, rather
than over the conductive deposits 12 on the flexible impression
sheet 4, or together therewith.
Many techniques may be used for making the drawn lines more readily
discernable. For example, a removable paper sheet can be placed
over the impression sheet, and the lines drawn in ink (or pencil)
on the paper sheet, the paper sheet being removed when the
conductive pathway is erased by separating the impression sheet.
Alternatively, the stylus used could be one which also applies a
wipeable marking to the impression sheet. Further, a conventional
"Magic Slate" could be placed over the impression sheet. Still
further, the conductive deposits on the impression sheet could be
in the form of milky or translucent coating (known per se), and the
printed circuit board, as well as the conductive deposits supplied
thereto, being of contrasting color, would thereby be viewable
through the impression sheet along the line of write, as in a
"Magic Slate." In such an arrangement, the wax coating 16 is
preferably applied on top of the conductors 6 on the printed
circuit board.
The device could also be constructed as a large display board for
demonstrating the assembly of various electrical circuits in the
manner described above.
Many other variations, modifications and applications of the
illustrated embodiment will be apparent.
* * * * *