US3898421A - Push button switch with elastic conductive sheet - Google Patents

Push button switch with elastic conductive sheet Download PDF

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Publication number
US3898421A
US3898421A US38882773A US3898421A US 3898421 A US3898421 A US 3898421A US 38882773 A US38882773 A US 38882773A US 3898421 A US3898421 A US 3898421A
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Prior art keywords
dimple
push button
electrodes
button switch
central portion
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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Masaki Suzumura
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Panasonic Corp
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Panasonic Corp
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/702Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2203/00Form of contacts
    • H01H2203/02Interspersed fingers
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2207/00Connections
    • H01H2207/01Connections from bottom to top layer
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2209/00Layers
    • H01H2209/068Properties of the membrane
    • H01H2209/078Conductive rubber
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2213/00Venting
    • H01H2213/002Venting with external pressure
    • H01H2213/004Scavenger; Filter
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2215/00Tactile feedback
    • H01H2215/004Collapsible dome or bubble
    • H01H2215/008Part of substrate or membrane

Abstract

There is provided a push button switch using an elastic conductive sheet having a spherical protuberance which is adapted to be deformed by a keytop for electrically connecting fixed electrodes formed on a printed circuit board. Spring means for returning the keytop is not required, so that the construction is simplified. Also, excellent switching action, operability and reliability can be ensured.

Description

United States Patent Suzumura Aug. 5, 1975 PUSH BUTTON SWITCH WITH ELASTIC 3,643,041 2/1972 Jackson 200/159 B x CONDUCTIVE SHEET 3,697,711 10/1972 Tetrick 7 3,761,944 9/1973 Shimojo [75] Inventor: Masaki Suzumura, Moriguchi, 3 734,772 1 1974 Nelson Japan 3,796,843 3/1974 Durkee et al. ZOO/159 B X [73] Assignee: Matsushita Electric Industrial C0., OR Osaka Japan 606,437 2/1959 Italy 200/159 B [22] Filed: Aug. 16, 1973 [2]] Appl. No.: 388,827 Primary ExaminerRobert K. Schaefer Assistant ExaminerWilliam J. Smith Foreign Application Priority Data fizi'ltlery, Agent, or Ftrm-Stevens, Davls, Miller &

Sept. 11, 1972 Japan 47-91545 Aug. 18, 1972 Japan... 47-96925 Sept. 11, 1972 Japan.... 47406403 57 ABSTRACT Sept. 11, 1972 Japan 47-106404 Oct. 20, 1972 Japan 47-121s94 There Provlded a Push button Swltch elastlc conductive sheet having a spherical protuberance 52 us. c1. 200/159 B; 200/241 which is adapted to be deformed by a keytOP for 511 Int. Cl. H0lh 13/52 "ically connecting fixed electrodes formed on a [58] new of Search 200/159 B, 5 A 83 N, 83 B, printed circuit board. Spring means for returning the ZOO/83 p, 241 243 168 G 83 Y, 83 w 67 DB keytop is not required, so that the construction is simplified. Also, excellent switching action, operability 56] References Cited and reliability can be ensured. UNITED STATES PATENTS 5 Claims, 25 Drawing Figures 2,635,546 4/1953 Enyeart et a1. ..200/83 Y PATENTEDMIB 51915 3,898,421

SHEET 1 FIG.I FlG.2

PRIOR ART PRIOR ART PATENTEU AUB 5|975 SHEET 1 PUSH BUTTON SWITCH WITH ELASTIC CONDUCTIVE SHEET This invention relates to push button switches using as elastic conductive sheet, and has as an object providing a push button switch suited particularly for use as a keyboard switch for desk-top electronic calculators.

Other objects, features and advantages of the present invention will be apparent from the following description taken in conjunction with the accompanying drawings, in which:

FIGS. 1 and 2 are sectional views showing prior art push button switches using a conductive plastic sheet;

FIG. 3 is an exploded perspective view of a keyboard switch assembly for desk-top electronic calculators using the push button switch according to the invention',

FIGS. 4 and 5 are sectional views showing embodiments of the push button switch according to the invention;

FIGS. 6a and 6b are sectional views showing different forms of the spherical protuberance incorporated in the push button switch according to the invention;

FIGS. 7a to 7d show the way in which the spherical protuberance of the push button switch according to the invention is deformed with pressure;

FIG. 8 is a sectional view showing a further example of the push button switch according to the invention;

FIGS. 9 and 10 are sectional views showing other embodiments of the push button switch according to the invention;

FIGS. 11a to 110 show examples of the spherical protuberance having a nodal character;

FIGS. 12 to 15 are sectional views showing still further embodiments of the push button switch according to the invention;

FIG. 16 is a view showing a conductor pattern on the printed circuit board of a prior art push button switch; and

FIGS. 17 to 19 are views showing electrode patterns on the printed circuit board of the push button switch according to the invention.

The prior art switch in which metal contacts are made and broken is prone to the phenomenon of chattering at the time the contacts are made. Also, if the contact pressure when the contacts are made is unnecessarily high, wear of the contact area becomes high, rendering the contact state unstable. This is of course undesirable from the standpoint of reliability, durability and safety to the switch. Heretofore, various types of switches have been proposed for overcoming the above drawbacks.

For example, push button switches in which the switching action is obtained by bringing a conductive plastic film into contact with electrodes printed on a printed circuit board and normally held underneath the conductive plastic film at a predetermined distance therefrom are roughly classed into two types as shown in FIGS. I and 2.

The switch of the type shown in FIG. I comprises a printed circuit board 1 having two electrodes 2 and 2 printed thereon, a return spring member such as a coil spring 3, a keytop 5 held in a frame 4 and having a downward integral extension 6, and a conductive plastic sheet piece 7 provided at the lower end of the extension 6 and having an area capable of covering both the electrodes 2 and 2'. The other type of switch shown in FIG. 2 has a construction consisting of a printed circuit board 1 having two electrodes 2 and 2 printed thereon, a return spring member such as a coil spring 3, a keytop 5 held in a frame 4 and having a downward integral extension 6 and a conductive plastic sheet 7 supported on a spacer intervening between printed circuit board 1 and plastic sheet 7' to hold the plastic sheet above and at a slight distance from the electrodes 2 and 2.

The switches of both of these types are actuated or closed when the electrodes 2 and 2' are contacted by the conductive plastic sheet piece 7 or plastic sheet 7 due to vertical displacement of the plastic film piece toward the electrodes 2 and 2 on the printed circuit board 1 caused by depressing the keytop 5.

In the switches of the above constructions, however, the elasticity of the conductive plastic sheet piece 7 or plastic sheet 7 constituting an element of the switch is not fully utilized. Also, since the plastic sheet piece is displaced in the vertical direction with respect to the electrodes, the closing of the switch is achieved only at the end of the downward stroke of the keytop. In other words, there is provided no play for any extra movement of the keytop after the switch is turned on, and the switch will not be actuated until the keytop is depressed through the full stroke. Therefore, the keytop 5 is subject to excessive depressing force, so that the wear of the contact area is spoiled. Further, since the keytop return spring 3 is used, the spring and the conductive plastic film piece are likely to resonate due to the elasticity of the spring and the complex elasticity of the conductive plastic, so that the possibility of occur rence of chattering is increased. This problem has been fatal in the prior art push button switch, and this type of chattering has direct bearing upon the users power or skill to operate the keytop and is liable to lead to malfunctioning of the keyboard switch of the desk-top electronic calculators and push botton telephone sets where chattering is particularly undesirable, thus greatly degrading the reliability and durability of these machines.

An object of theinvention is to provide a push button switch having a construction effectively utilizing the elasticity of an elastic sheet of a conductive material such as a conductive rubber sheet and conductive plastic sheet for returning the keytop due to the elasticity of the elastic sheet.

Another object of the invention is to prevent chattering by an arrangement wherein the switch is closed at an intermediate point of the full stroke of the keytop.

A further object of the invention is to provide a push button switch which can be reliably closed by lightly depressing the keytop.

A still further object of the invention is to provide simplified construction and improved reliability of the switch by using a conductive plastic sheet.

The push button switch according to the invention will now be described in connection with some embodiments thereof.

FIG. 3 shows a keyboard switch assembly for desktop electronic calculators using the push button switch according to the invention. In the Figure, reference numeral 30 designates a keytop supported in a frame 31 such that it can be moved vertically. Numeral 32 designates an elastic conductive sheet formed with a plurality of spherical protuberances 33 each formed at a position corresponding to the associated keytop 30. Numeral 34 designates an insulating sheet formed with holes 35 each corresponding in position to the associated spherical protuberance 33. Numeral 36 designates a printed circuit board having conductor patterns 37 printed thereon. It is also formed with small holes 38 each for each switch. Numeral 39 designates a dust filter.

FIGS. 4 and 5 show embodiments of the push button switch according to the invention. In these Figures, like reference numerals refer to corresponding parts.

The embodiment of FIG. 4 comprises a printed circuit board 9 having electrodes 10 and 10' formed thereon. Held over the printed circuit board 9 and supported on a spacer 12 having a diaphragm structure is a conductive plastic sheet having a spherical protuberance 11' extending directly above the electrode 10. The other electrode 10 is in contact with the conductive plastic sheet 11. Numeral l3 designates a frame having a hole 14, and numeral designates a keytop having an integral downward extension 16. The keytop 15 is mounted in the hole 14 of the frame 13 such that it can be moved vertically.

In operation, by downwardly depressing the keytop 15 the lower end of the extension 16 of the keytop 15 pushes and deforms the spherical protuberance 11' of the conductive plastic sheet 11 to bring the protuberance 11' into contact with the electrode 10', thus electrically connecting the electrodes 10 and 10. If the conductive plastic sheet 11 formed with the spherical protuberance 11 has elasticity, the spherical protuberance 11 will flex in a quick action. More particularly, when pressure is applied to the keytop 15, it will not flex until a certain predetermined pressure is reached and will undergo sudden flexural deformation as soon as this pressure value is exceeded. When the pressure applied to the keytop 15 is removed, the spherical protuberance is quickly restored to the initial state and separated from the fixed electrode 10', thus opening the associated electric circuit. In this way, the electric circuit is closed and opened. Since this is down in a quick action, reliable operation can be ensured. Also, the coil spring for returning the keytop used in the prior art can be omitted, which is a great advantage in view of the cost.

In the embodiment of FIG. 5, which also uses a conductive plastic sheet having a spherical protuberance, the conductive plastic sheet 11 is normally in contact with neither electrode 10 or 10', and it is brought into contact with both electrodes 10 and 10' on the printed circuit board 9 normally extending below it for closing the switch. Otherwise, the operation and effects are the same as in the preceding embodiment of FIG. 4.

The extent of the quick action and the returnability of the keytop may be suitably preset by appropriately selecting the hardness and thickness of the conductive plastic sheet and the shape and dimensions of the spherical protuberance.

FIGS. 6a and 6b show other possible shapes of the spherical protuberance, and these and other shapes may be appropriately selected to match the design values of the push button switch depressing pressure, stroke and so forth.

FIGS. 70 to 7d show transforming states of movements according to an embodiment of the invention. This switch according to the invention comprises a sup port consisting of a printed circuit board 9 having electrodes 10 and 10 formed thereon by means of the printed circuit technique. an elastic conductive plastic ill sheet 11 having a spherical protuberance or dimple 20 having a flexural node for two-step deformation and a spacer 12 having a diaphragm structure for insulating the sheet 11 from the printed circuit on the printed circuit board. In this embodiment, an annular shoulder 20a on the spherical protuberance or dimple 20 of the conductive plastic sheet 11 is brought into contact with the electrodes 10 and 10' due to its flexing for closing the associated electric circuit.

FIG. 7a shows the switch in its off state without any pressure exerted on the spherical protuberance 20. When pressure is exerted on the spherical protuberance 20 for turning on the switch. the conductive plastic sheet 11 flexes about the flexural node of the spherical protuberance 20 as shown in FIG. 712. Then, as the first step in the deforming action the flexural node shoulder 20a are brought into contact with the board 9 as shown in FIG. 70. As this instant, the flexural node is brought into contact with the electrodes 10 and 10 on the board 9 to turn on the switch. Subsequently, the conductive plastic sheet 11 can undergo the second step deformation wherein the central portion 20b of the dimple 20 is pressed between electrodes 10 and 10' as shown in FIG. 7d. In this way, there is provided a socalled trouble after the closure of the switch.

If the conductive plastic sheet 11 formed with the spherical protuberance 20 has elasticity, the spherical protuberance 20 will flex in quick action. More particularly, when pressure is applied to it, it will not flex until a certain predetermined pressure is reached and will undergo sudden flexural deformation as soon as this pressure level is exceeded.

When the pressure applied is removed, the spherical protuberance 20 is quickly restored to its initial state and separated from the electrodes 10 and 10', thus opening the associated electric circuit. In this way, the electric circuit is closed and opened. Since this is done in quick actions, reliable operation can be ensured. Also, it is possible to suitably preset a point at which the switching action takes place (FIG. during the total displacement from the state of FIG. 7a to the state of FIG. 7d (corresponding to the full stroke of the push button switch) so as to provide for the so-called trouble for the displacement from the state of FIG. 70 to the state of FIG. 7d. By doing so, an excellent sense of operation may be obtained. Further, since the spherical protuberance 20 can provide a large restoring force, the coil spring for returning the keytop in the prior art can be omitted, which is a great advantage in view of the cost.

FIG. 8 shows a modification of the preceding embodiment. In this modification, the electrode 10 and conductive plastic sheet 11 are always in contact with each other, and only when turning on the switch the flexural node portion of the spherical protuberance 20 of the conductive plastic sheet 11 is brought into contact with the other electrode 10.

FIGS. 9 and 10 show embodiments of the push button switch using the afore-mentioned switching mechanism. In these embodiments, the keytop 44 made of an insulating material is mounted in a hole formed in the top wall of a switch frame 13 such that it can be moved vertically, and the afore-mentioned switching mechanism is provided below the keytop 44. In the embodiment of FIG. 9, the switching mechanism consists of a printed circuit boa'rd9 having electrodes 10 and 10' provided with leads, a conductive plastic sheet 11 and a spacer 12 for insulating the conductive plastic sheet 11 when the switch is off. In the embodiment of FIG,

switch the flexural node portion of the spherical protu-.

berance 20 of the conductive plastic sheet 11 is brought into contact with theother electrode In the operation of these embodiments, with the downward movement of the keytop 44 of the conductive plastic sheet ll is flexed and brought into contact with the electrodes 10 and 10' (or only the electrode 10) at the time of the first step deforming action, with the second step deforming action reserved for the so-called trouble after the closure of the switch. In this way, the closing and opening of the associated electric circuit are effected.

The extent of the quick action and the returnability of the keytop may be suitably preset by appropriately selecting the hardness and thickness of the conductive plastic sheet and the shape and dimensions of the flexural node of the spherical protuberance.

FIGS. 11a to 11 show possible shapes of the spherical protuberance having a flexural node for two-step deformation, and these and other shapes may be appropriately selected to match the design values of the push button switch depressing pressure, stroke and so forth. Also, where a plurality of push button switches are assembled into a keyboard switch assembly for desktop electronic calculators, push botton telephone sets and so forth, the productivity may be improved by using a single sheet formed with a plurality of spherical protuberances at a suitable pitch as the conductive plastic sheet ll.

FIGS. 12 and 13 show further embodiments of the push button switch according to the invention. Either of these embodiments comprises a switch frame 51, a keytop 52 of an insulating material mounted for vertical movement in a hole formed in the top wall of the frame 51, a conductive plastic sheet 53 disposed below the keytop 52 and having a spherical protuberance, electrodes 54 and 54 facing the spherical protuberance and formed on a board 56 formed with a small hole 55 and a spacer 57 of a diaphragm structure provided for taking out leads from the electrodes 54 and 54' and insulating the plastic sheet 53.

In operation, when the keytop 52 is downwardly depressed with pressure applied thereto, the spherical protuberance of the conductive plastic sheet 53 undergoes flexural deformation and is brought into contact with the electrodes 54 and 54 to close the associated electric circuit. When the applied pressure is removed the electric circuit is opened due to the effect of the small hole 55 formed in the board 56 and the elastic restoring force of the conductive plastic sheet 53. In this way. the electric circuit is closed and opened.

In the embodiment of FIG. 12, the conductive plastic sheet 53 is adapted to undergo single step deformation, with the switch closed at the end of the full stroke, while in the embodiment of FIG. 13 two-step deformation of the conductive plastic sheet is provided to provide for a so-called trouble after the closure of the switch. In both these embodiments. the function and effects of the small hole 55 formed in the board 56 are the same.

FIGS. 14 and 15 show still further embodiments of the push button switch according to the invention. Either of these embodiments comprises a switch frame,

a keytop of an insulating material mounted for vertical movement in a hole formed in the top wall of the frame 51, a conductive plastic sheet 53 disposed below the keytop 52 and having a spherical-protuberance, electrodes 54 and 54 facing the spherical protuberance and formedon a board 56 formed with a small hole 55, a spacer 57 of a diaphragm structure provided for taking out leads from the electrodes 54 and 54 and insulating the plastic sheet 53 and a fibrin cloth-like insulator 58 serving as a filter.

In operation, when the keytop 52 is downwardly depressed with pressure applied thereto, the spherical protuberance of the conductive plastic sheet 53 undergoes flexural deformation and-is brought into contact with the electrodes 54 and 54 to close the associated electric circuit. When the applied pressure is removed, the electric circuit is opened due to the effect of the small hole 55 formed in the board 56 and the elastic restoring force of the conductive plastic sheet 53. In this way, the electric circuit is closed and opened.

In the embodiment of FIG. 14 the conductive plastic sheet 53 is adapted to undergo single step deformation, with the switch closed at the end of the full stroke, while in the embodiment of FIG. 15 two-step deformation of the conductive plastic sheet is provided to provide for a so-called trouble after the closure of the switch. In both these embodiments, the function and effects of the small hole 55 formed in the board 56 and the filter 58 are the same.

For the fibrin cloth-like insulator 58 which serves as a filter, a porous or net-like material which permits the flow of air but does not transmit the dust in the air may be used. While felt is the best material, formed plastic such as urethane foam having thin continuous pores may also be effectively used. Also, it may extend over the entire back area of the board 56 or only for the portion adjacent the small hole 55.

As has been described, according to the invention with the provision of the spherical protuberance in the conductive plastic sheet and the small hole in the printed circuit board the resonance and bounce phenomena can be eliminated, and also the chattering can be minimized. Further, reliable return action can be ensured. Furthermore, with the provision of the filter means contact failure due to collection of dust can be prevented. Thus, it is possible to provide a push button switch having excellent reliability and stability.

FIGS. 16 to 19 show conductor patterns to be formed on the printed circuit board. FIG. 16 shows a prior art pattern. With such a simple pattern consisting of two separate rectangles it is likely that a steady and stable contact state is not obtained depending upon the shape and structure of the conductive material brought into contact with the electrodes, giving rise to chattering phenomenon at the time of contact. FIGS. 17 to 19 show conductor patterns which can prevent such chattering phenomenon. With combinations of comb-like patterns of the two electrodes printed on the board, reliable and stable contact of these electrodes with the conductive plastic material may be ensured so that it is possible to provide a push button switch of high reliability.

What we claim is:

l. A push button switch comprising support means; a pair of fixed spaced electrodes located on said support means; and an elastic conductive sheet having a dimple positioned adjacent said electrodes and spaced therefrom by a predetermined distance, said dimple including a central portion and an annular shoulder separated from said central portion by a flexural node, said dimple being deformable with a double snap action when depressed by a force exerted on the central portion thereof, the first snap action of said dimple forcing said annular shoulder into contact with said pair of fixed electrodes thereby making electrical contact therebetween, and the following snap action forcing the central portion of said dimple between said electrodes.

2. A push button switch comprising a printed circuit board; spaced fixed electrode means printed on said printed circuit board; an elastic conductive sheet having a dimple positioned adjacent said electrodes and spaced therefrom by a predetermined distance, said dimple including a central portion and an annular shoulder separated from said central portion by a flexural node, said dimple being deformable with a double snap action when depressed by a force exerted on the central portion thereof; and a keytop slidably supported above said dimple for depressing said dimple, the first snap action of said dimple forcing said annular shoulder into contact with said pair of fixed electrodes thereby making electrical contact therebetween, and the following snap action forcing the central portion of said dimple between said electrodes.

3. The push button switch according to claim 2, which further comprises an insulating member having a hole therein in the position corresponding to said dimple, said insulating member being disposed between said conductive sheet and said printed circuitboard.

4. The push button switch according to claim 2, wherein said printed circuit board has a small hole for the escape of air.

5. The push button switch according to claim 2, which further comprises a fibrin filter provided on the underside of said printed circuit board.

Claims (5)

1. A push button switch comprising support means; a pair of fixed spaced electrodes located on said support means; and an elastic conductive sheet having a dimple positioned adjacent said electrodes and spaced therefrom by a predetermined distance, said dimple including a central portion and an annular shoulder separated from said central portion by a flexural node, said dimple being deformable with a double snap action when depressed by a force exerted on the central portion thereof, the first snap action of said dimple forcing said annular shoulder into contact with said pair of fixed electrodes thereby making electrical contact therebetween, and the following snap action forcing the central portion of said dimple between said electrodes.
2. A push button switch comprising a printed circuit board; spaced fixed electrode means printed on said printed circuit board; an elastic conductive sheet having a dimple positioned adjacent said electrodes and spaced therefrom by a predetermined distance, said dimple including a central portion and an annular shoulder separated from said central portion by a flexural node, said dimple being deformable with a double snap action when depressed by a force exerted on the central portion thereof; and a keytop slidably supported above said dimple for depressing said dimple, the first snap action of said dimple forcing said annular shoulder into contact with said pair of fixed electrodes thereby making electrical contact therebetween, and the following snap action forcing the central portion of said dimple between said electrodes.
3. The push button switch according to claim 2, which further comprises an insulating member having a hole therein in the position corresponding to said dimple, said insulating member being disposed between said conductive sheet and said printed circuit board.
4. The push button switch according to claim 2, wherein said printed circuit board has a small hole for the escape of air.
5. The push button switch according to claim 2, which further comprises a fibrin filter provided on the underside of said printed circuit board.
US3898421A 1972-08-18 1973-08-16 Push button switch with elastic conductive sheet Expired - Lifetime US3898421A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP9692572U JPS4953268U (en) 1972-08-18 1972-08-18
JP9154572A JPS5326308B2 (en) 1972-09-11 1972-09-11
JP10640472U JPS4962173U (en) 1972-09-11 1972-09-11
JP10640372U JPS4962172U (en) 1972-09-11 1972-09-11
JP12159472U JPS4976261U (en) 1972-10-20 1972-10-20

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US (1) US3898421A (en)
CA (1) CA998413A (en)
DE (1) DE2341521C3 (en)
FR (1) FR2196515B1 (en)
GB (1) GB1441765A (en)
NL (1) NL155674B (en)

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US4421958A (en) * 1980-06-10 1983-12-20 Nippon Mektron Co., Ltd. Panel keyboard with air permeable spacer
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US4477700A (en) * 1983-11-14 1984-10-16 Rogers Corporation Tactile membrane keyboard with elliptical tactile key elements
US4485279A (en) * 1982-02-16 1984-11-27 Alps Electric Co., Ltd. Keyboard switch
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US4524254A (en) * 1982-11-17 1985-06-18 Kabushiki Kaisha Tokai Rika Denki Seisakusho Pressure switch
US4524249A (en) * 1984-06-01 1985-06-18 Texas Instruments Incorporated Keyboard switch assembly
US4536625A (en) * 1983-04-20 1985-08-20 Bebie Alain M Keyboard design
US4599496A (en) * 1983-02-10 1986-07-08 Lecklider Thomas H Variable control device
US4609791A (en) * 1984-12-20 1986-09-02 Itt Corporation Flexible diaphragm keypad and method of manufacture
US4647728A (en) * 1984-08-21 1987-03-03 Northern Telecom Limited Programming switch assembly for communication terminals
US4649246A (en) * 1983-02-01 1987-03-10 Hand Widmaier Fabrik Fur Apparate Der Fernmelde -Und Feinwerktechnik Keyboard for initiating switching operations or switching signals associated with respective symbols on the surfaces of the keys
US4695681A (en) * 1985-05-22 1987-09-22 Velleman-Switch, Naamloze Vennootschap Membrane for membrane switches and composing elements thereof
US4760217A (en) * 1987-02-04 1988-07-26 Brother Kogyo Kabushiki Kaisha Keyboard having lower casing with integral upraised portion for supporting PC board, and key switch having air vent in PC board
USRE32977E (en) * 1983-04-20 1989-07-04 Brother Kogyo Kabushiki Kaisha Key-holding structure of keyboard with curved operating surface of keys
US5431064A (en) * 1992-09-18 1995-07-11 Home Row, Inc. Transducer array
US5508703A (en) * 1992-09-14 1996-04-16 Smk Corporation Membrane switch having a rotary motion detection function
US5612692A (en) * 1994-06-03 1997-03-18 Hewlett-Packard Company Full travel, sealed, fully backlighted keyboard
US5874700A (en) * 1996-03-07 1999-02-23 Preh-Werke Gmbh & Co. Kg Switch mat
US5895900A (en) * 1996-12-20 1999-04-20 Aisin Seiki Kabushiki Kaisha Pressure sensitive seat switch with air vent passages
WO2001008182A1 (en) * 1999-07-28 2001-02-01 Hohmann, Arno Touch-contact for chip cards
EP1158553A1 (en) * 2000-05-24 2001-11-28 TELEFONAKTIEBOLAGET L M ERICSSON (publ) Keyboard comprising a dome foil
WO2001091150A1 (en) * 2000-05-24 2001-11-29 Telefonaktiebolaget L M Ericsson (Publ) Keyboard comprising a dome foil
US6567276B2 (en) * 2001-04-20 2003-05-20 Hewlett-Packard Development Company L.P. Electromagnetic interference shield
US6614380B1 (en) * 1999-08-31 2003-09-02 Siemens Vdo Automotive Corporation Reverse dome switch
US20030173201A1 (en) * 2002-03-15 2003-09-18 Brother Kogyo Kabushiki Kaisha Membrane switch, key switch using membrane switch, keyboard having key switches, and personal computer having keyboard
US6664901B1 (en) * 1999-02-22 2003-12-16 Alps Electric Co., Ltd. Keyboard input device
US6748869B1 (en) * 1998-12-16 2004-06-15 Delegation Generale Pour L'armement Batiment La Rotonde Device for firing a primer
US20090002975A1 (en) * 2007-06-26 2009-01-01 Inventec Appliances Corp. Device with button restriction element
CN101388297B (en) 2007-09-11 2010-09-29 徐孝海 Inching switch for thin-film circuit
US20110168420A1 (en) * 2010-01-13 2011-07-14 Omron Corporation Trigger switch and electric tool provided therewith
US20130183641A1 (en) * 2012-01-13 2013-07-18 Pegatron Corporation Braille reading-writing device
CN103956289A (en) * 2014-04-24 2014-07-30 昆山达功电子有限公司 Novel normally-closed button
US20140346936A1 (en) * 2013-05-27 2014-11-27 Samsung Electronics Co., Ltd. Protection cover
US9268442B1 (en) * 2013-01-09 2016-02-23 Google Inc. Apparatus and method for receiving input
US9323362B1 (en) 2013-01-09 2016-04-26 Google Inc. Apparatus and method for receiving input
US10068724B2 (en) 2015-12-21 2018-09-04 Eta Sa Manufacture Horlogere Suisse Push-button arrangement for an electronic or electromechanical wristwatch

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USRE30923E (en) * 1973-01-02 1982-05-04 Bowmar Instrument Corporation Calculator keyboard switch with disc spring contact and printed circuit board
US4033030A (en) * 1974-09-12 1977-07-05 Mohawk Data Sciences Corporation Method of manufacturing keyswitch assemblies
US3947390A (en) * 1974-09-23 1976-03-30 Xerox Corporation Arch shaped snap-type switch contact
US3996429A (en) * 1975-04-18 1976-12-07 Northern Electric Company Limited Multi-contact push-button switch having plural prestressed contact members designed to provide plural circuit simultaneous switching inputs
US4021630A (en) * 1975-04-25 1977-05-03 Neomed Incorporated Hermetically sealed resilient contact switch having surgical applications
US4034176A (en) * 1975-06-11 1977-07-05 Magic Dot, Inc. Membrane switch apparatus
US3987259A (en) * 1975-06-12 1976-10-19 Globe-Union Inc. Membrane switch apparatus having sequential bridging contact arrangement
US4065649A (en) * 1975-06-30 1977-12-27 Lake Center Industries Pressure sensitive matrix switch having apertured spacer with flexible double sided adhesive intermediate and channels optionally interposed between apertures
US4017697A (en) * 1975-09-15 1977-04-12 Globe-Union Inc. Keyboard membrane switch having threshold force structure
US4046975A (en) * 1975-09-22 1977-09-06 Chomerics, Inc. Keyboard switch assembly having internal gas passages preformed in spacer member
US4118858A (en) * 1976-04-19 1978-10-10 Texas Instruments Incorporated Method of making an electronic calculator
US4081898A (en) * 1976-04-19 1978-04-04 Texas Instruments Incorporated Method of manufacturing an electronic calculator utilizing a flexible carrier
US4145584A (en) * 1976-04-28 1979-03-20 Otterlei Jon L Flexible keyboard switch with integral spacer protrusions
US4184321A (en) * 1976-05-20 1980-01-22 Kabushiki Kaisha Suwa Seikosha Electronic wristwatch with calculator having improved conductive packing sheet switch element
US4201043A (en) * 1976-07-16 1980-05-06 Kabushiki Kaisha Suwa Seikosha Wristwatch calculator imput key positioning assembly
US4066855A (en) * 1976-11-22 1978-01-03 Control Data Corporation Vented membrane-type touch panel
US4190748A (en) * 1977-01-31 1980-02-26 Rogers Corporation Keyboard switch assembly
US4096364A (en) * 1977-02-22 1978-06-20 Chomerics, Inc. Keyboard switch assembly having flexible contact layer with snap initiator dome
US4129758A (en) * 1977-06-10 1978-12-12 Telaris Telecommunications, Inc. Keyboard switch assembly having flexible contact carrying member between contact carrying substrate and flexible, resilient, key-depressible bubble protrusions
US4127758A (en) * 1977-10-13 1978-11-28 Sheldahl, Inc. Tactile layer having hinged dome
US4194099A (en) * 1977-10-25 1980-03-18 W. H. Brady Co. Control panel overlay
US4259551A (en) * 1978-03-15 1981-03-31 Citizen Watch Co., Ltd. External operation device for electronic timepieces
US4207443A (en) * 1978-03-17 1980-06-10 Mikado Precision Industries Ltd. Key-operated switch and an assemblage of such switches for electronic desk calculators or the like
US4228329A (en) * 1978-06-26 1980-10-14 Hitachi, Ltd. Compact keyboard structure
US4228330A (en) * 1978-07-10 1980-10-14 Litton Systems, Inc. Touch panel mechanism
US4307268A (en) * 1978-11-17 1981-12-22 Rogers Corporation Tactile element and keyboard including the tactile element
US4286129A (en) * 1978-11-24 1981-08-25 Orega Electronique Et Mecanique Keyboard having sudden trip tactile effect keys
US4246452A (en) * 1979-01-05 1981-01-20 Mattel, Inc. Switch apparatus
US4324956A (en) * 1979-05-24 1982-04-13 Omron Tateisi Electronics Co. Fluid-proof slide switch
US4314227A (en) * 1979-09-24 1982-02-02 Eventoff Franklin Neal Electronic pressure sensitive transducer apparatus
US4365130A (en) * 1979-10-04 1982-12-21 North American Philips Corporation Vented membrane switch with contaminant scavenger
US4336529A (en) * 1980-02-19 1982-06-22 Pitney Bowes Inc. Postage meter having shielded keyboard to protect against electromagnetic radiation
US4376238A (en) * 1980-03-12 1983-03-08 International Computers Limited Electrical devices
US4390765A (en) * 1980-06-09 1983-06-28 Shin-Etsu Polymer Co., Ltd. Rubber-made covering member for push button switches
US4421958A (en) * 1980-06-10 1983-12-20 Nippon Mektron Co., Ltd. Panel keyboard with air permeable spacer
US4378478A (en) * 1980-08-29 1983-03-29 International Standard Electric Corporation Double-domed elastomeric keyboard element
US4376239A (en) * 1980-10-03 1983-03-08 Allen-Bradley Company Industrial membrane switch
US4345119A (en) * 1981-02-19 1982-08-17 Motorola Inc. Membrane switch assembly with improved spacer
US4453061A (en) * 1981-06-09 1984-06-05 Ryutaro Tamura Capacitance type switch having dust-free interior
US4514604A (en) * 1981-07-17 1985-04-30 Kaltenbach & Voigt Gmbh & Co. Arrangement for converting the pressure of a medium into an electrical signal
US4408103A (en) * 1982-01-06 1983-10-04 Smith Engineering Joystick operated multiple position switch
US4485279A (en) * 1982-02-16 1984-11-27 Alps Electric Co., Ltd. Keyboard switch
US4499342A (en) * 1982-03-04 1985-02-12 Murakami Kaimeido Co., Ltd. Multi-position electric switch
US4524254A (en) * 1982-11-17 1985-06-18 Kabushiki Kaisha Tokai Rika Denki Seisakusho Pressure switch
US4649246A (en) * 1983-02-01 1987-03-10 Hand Widmaier Fabrik Fur Apparate Der Fernmelde -Und Feinwerktechnik Keyboard for initiating switching operations or switching signals associated with respective symbols on the surfaces of the keys
US4599496A (en) * 1983-02-10 1986-07-08 Lecklider Thomas H Variable control device
US4490587A (en) * 1983-04-07 1984-12-25 Microdot Inc. Switch assembly
USRE32977E (en) * 1983-04-20 1989-07-04 Brother Kogyo Kabushiki Kaisha Key-holding structure of keyboard with curved operating surface of keys
US4536625A (en) * 1983-04-20 1985-08-20 Bebie Alain M Keyboard design
US4468542A (en) * 1983-05-16 1984-08-28 Kb Denver, Inc. Keyboard assembly
US4477700A (en) * 1983-11-14 1984-10-16 Rogers Corporation Tactile membrane keyboard with elliptical tactile key elements
US4524249A (en) * 1984-06-01 1985-06-18 Texas Instruments Incorporated Keyboard switch assembly
US4647728A (en) * 1984-08-21 1987-03-03 Northern Telecom Limited Programming switch assembly for communication terminals
US4609791A (en) * 1984-12-20 1986-09-02 Itt Corporation Flexible diaphragm keypad and method of manufacture
US4695681A (en) * 1985-05-22 1987-09-22 Velleman-Switch, Naamloze Vennootschap Membrane for membrane switches and composing elements thereof
US4760217A (en) * 1987-02-04 1988-07-26 Brother Kogyo Kabushiki Kaisha Keyboard having lower casing with integral upraised portion for supporting PC board, and key switch having air vent in PC board
US5508703A (en) * 1992-09-14 1996-04-16 Smk Corporation Membrane switch having a rotary motion detection function
US5431064A (en) * 1992-09-18 1995-07-11 Home Row, Inc. Transducer array
US5583303A (en) * 1992-09-18 1996-12-10 Incontrol Solutions, Inc. Transducer array
US5578765A (en) * 1992-09-18 1996-11-26 Incontrol Solutions, Inc. Transducer array
US5612692A (en) * 1994-06-03 1997-03-18 Hewlett-Packard Company Full travel, sealed, fully backlighted keyboard
US5874700A (en) * 1996-03-07 1999-02-23 Preh-Werke Gmbh & Co. Kg Switch mat
US5895900A (en) * 1996-12-20 1999-04-20 Aisin Seiki Kabushiki Kaisha Pressure sensitive seat switch with air vent passages
US6748869B1 (en) * 1998-12-16 2004-06-15 Delegation Generale Pour L'armement Batiment La Rotonde Device for firing a primer
US6664901B1 (en) * 1999-02-22 2003-12-16 Alps Electric Co., Ltd. Keyboard input device
WO2001008182A1 (en) * 1999-07-28 2001-02-01 Hohmann, Arno Touch-contact for chip cards
US6614380B1 (en) * 1999-08-31 2003-09-02 Siemens Vdo Automotive Corporation Reverse dome switch
WO2001091150A1 (en) * 2000-05-24 2001-11-29 Telefonaktiebolaget L M Ericsson (Publ) Keyboard comprising a dome foil
EP1158553A1 (en) * 2000-05-24 2001-11-28 TELEFONAKTIEBOLAGET L M ERICSSON (publ) Keyboard comprising a dome foil
US6567276B2 (en) * 2001-04-20 2003-05-20 Hewlett-Packard Development Company L.P. Electromagnetic interference shield
US20030173201A1 (en) * 2002-03-15 2003-09-18 Brother Kogyo Kabushiki Kaisha Membrane switch, key switch using membrane switch, keyboard having key switches, and personal computer having keyboard
US6797906B2 (en) * 2002-03-15 2004-09-28 Brother Kogyo Kabushiki Kaisha Membrane switch, key switch using membrane switch, keyboard having key switches, and personal computer having keyboard
US8102672B2 (en) * 2007-06-26 2012-01-24 Inventec Appliances Corp. Device with button guiding element
US20090002975A1 (en) * 2007-06-26 2009-01-01 Inventec Appliances Corp. Device with button restriction element
CN101388297B (en) 2007-09-11 2010-09-29 徐孝海 Inching switch for thin-film circuit
US20110168420A1 (en) * 2010-01-13 2011-07-14 Omron Corporation Trigger switch and electric tool provided therewith
US8550181B2 (en) * 2010-01-13 2013-10-08 Omron Corporation Trigger switch and electric tool provided therewith
US20130183641A1 (en) * 2012-01-13 2013-07-18 Pegatron Corporation Braille reading-writing device
US9323362B1 (en) 2013-01-09 2016-04-26 Google Inc. Apparatus and method for receiving input
US9268442B1 (en) * 2013-01-09 2016-02-23 Google Inc. Apparatus and method for receiving input
US20140346936A1 (en) * 2013-05-27 2014-11-27 Samsung Electronics Co., Ltd. Protection cover
CN103956289A (en) * 2014-04-24 2014-07-30 昆山达功电子有限公司 Novel normally-closed button
US10068724B2 (en) 2015-12-21 2018-09-04 Eta Sa Manufacture Horlogere Suisse Push-button arrangement for an electronic or electromechanical wristwatch

Also Published As

Publication number Publication date Type
NL7311342A (en) 1974-02-20 application
FR2196515B1 (en) 1977-09-16 grant
GB1441765A (en) 1976-07-07 application
DE2341521C3 (en) 1978-05-18 grant
DE2341521B2 (en) 1977-09-22 application
CA998413A (en) 1976-10-12 grant
CA998413A1 (en) grant
DE2341521A1 (en) 1974-02-28 application
NL155674B (en) 1978-01-16 application
FR2196515A1 (en) 1974-03-15 application

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