Touch switch keyboard apparatus

• US 4,276,538 A
• Filed: 01/07/1980
• Issued: 06/30/1981
• Est. Priority Date: 01/07/1980
• Status: Expired due to Term

• Current Assignee: Interlink Electronics Incorporated
• Original Assignee: Franklin N. Eventoff
• Inventors: Eventoff, Franklin N., Tcherepnin, Serge A.
• Primary Examiner(s): Albritton, C. L.
• Application Number:
  US06/110,416
• Time in Patent Office: 540 Days
• Field of Search: 338/69, 338/99, 338/114, 338/110, 338/153, 84/DIG. 7, 84/1.25, 84/1.24, 84/1.01
• US Class Current: 338/69
• CPC Class Codes: H01H 1/029 comprising conducting material dispersed in an elastic support or binding material
• CPC Class Codes: H01H 13/702 with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
• CPC Class Codes: H01H 13/703 characterised by spacers between contact carrying layers
• CPC Class Codes: H01H 13/785 characterised by the material of the contacts, e.g. conductive polymers
• CPC Class Codes: H01H 13/80 characterised by the manner of cooperation of the contacts, e.g. with both contacts movable or with bounceless contacts
• CPC Class Codes: H01H 13/807 characterised by the spatial arrangement of the contact sites, e.g. superimposed sites
• CPC Class Codes: H01H 2201/002 bounceless
• CPC Class Codes: H01H 2201/036 Variable resistance
• CPC Class Codes: H01H 2203/012 Microprotrusions
• CPC Class Codes: H01H 2203/02 Interspersed fingers
• CPC Class Codes: H01H 2211/032 Pressure sensitive layer on contacts
• CPC Class Codes: H01H 2213/002 with external pressure
• CPC Class Codes: H01H 2215/008 Part of substrate or membrane
• CPC Class Codes: H01H 2221/02 pneumatic
• CPC Class Codes: H01H 2225/002 superimposed
• CPC Class Codes: H01H 2225/006 more then one pole
• CPC Class Codes: H01H 2227/012 Conductive rubber
• CPC Class Codes: H01H 2227/014 Conductive particles
• CPC Class Codes: H01H 2229/002 Screen printing
• CPC Class Codes: H01H 2229/012 Vacuum deposition
• CPC Class Codes: H01H 2229/014 : Electro deposition
• CPC Class Codes: H01H 2229/028 : Adhesive
• CPC Class Codes: H01H 2229/038 : Folding of flexible printed circuit
• CPC Class Codes: H01H 2231/018 : Musical instrument
• CPC Class Codes: H01H 2239/016 : combined with start switch, discrete keyboard
• CPC Class Codes: Y10S 84/07 : Electric key switch structure

Abstract

A multiple touch switch apparatus has at least one multiple segment conductor ply on the top surface of a support ply. The segments are electrically insulated from each other by their lateral displacement but are immediately adjacent so that a selected one or more of the segments can be contacted in response to a single transverse touch force. A second support ply has a unitary conduction ply on its bottom surface spaced apart from, but facing, the multiple segment conductor ply. At least the second support ply and the unitary conduction ply are resilient deformable into contact with one or more segments of the multiple segment conductor ply. Each of the multiple segment conductors or the unitary conduction ply or both may incorporate a conductor layer and a pressure sensitive semiconductor composition layer disposed thereon. The semiconductor layer provides a pressure sensitive variable contact resistance in series with the switch. In another embodiment, each multiple segment conductor ply may be replaced by a single segment conductor.

Claims

1. A multiple touch switch apparatus for being selectively actuated in response to the application of at least one transverse force comprising:

a first support ply having a top surface;

at least one multiple segment conductor ply positioned on the top surface of the first support ply, comprising;

a plurality of first electrically isolated conductor segments immediately adjacent but laterally displaced from one another and having a surface area whereby at least a selected one of the first electrically isolated conductor segments is simultaneously contacted in response to the application of a single transverse touch force;

a second support ply having a top surface and a bottom surface;

a unitary conduction ply positioned on the bottom surface facing and transversely spaced from the at least one multiple segment conduction ply, the second support ply and unitary conduction ply being resiliently deformable for deforming the unitary conduction ply into electrical contacting relationship with at least one selected multiple segment conductor ply in response to the application of the transverse force, the unitary conductor ply comprising;

a first conductive layer positioned on the bottom surface of the second support ply, and

a first semiconductor composition layer

positioned on the first conductive layer for facing the

at least one multiple segment conductor ply; and

a transverse spacer positioned laterally between each multiple segment conductor ply and transversely between the first and second support plies for spacing the unitary conduction ply from the at least one multiple segment conductor ply.

2. The multiple touch switch apparatus of claim 1 wherein each first electrically isolated conductor segment comprises:

a second conductive layer positioned on the top surface of the first support ply; and

a second semiconductor composition layer positioned on the second conductive layer for facing the unitary conduction ply.

3. The multiple touch switch apparatus of claims 1 or 2 wherein at least one of the first electrically isolated conductor segments in each multiple segment conductor ply has a surface area larger than the surface area of the other first electrically isolated conductor segments.

4. The multiple touch switch apparatus of claims 1 or 2 further comprising:

a first conductor ply affixed to the top surface of the second support ply.

a third support ply having a bottom surface;

a second conductor ply affixed to the bottom surface of the third support ply, facing and transversely spaced from the first conductor ply, the third support ply and the second conductor ply being resiliently deformable for deforming the second conductor ply into electrical contacting relationship with the first conductor ply in response to the application of a transverse force against the third support ply.

5. A multiple touch switch apparatus for being selectively actuated in response to the application of at least one transverse force comprising:

a first support member having a top surface;

at least one multiple segment conductor ply positioned on the top surface of the first support member comprising;

a plurality of first electrically isolated conductor segments immediately adjacent but laterally displaced from one another and having a surface area whereby at least a selected one of the first electrically isolated conductor segments is simultaneously contacted in response to the application of the single transverse touch force;

a second support member having a top surface and a bottom surface;

a first conductor layer positioned on the bottom surface of the second support member and having a plurality of conducting regions, each region being juxtaposed opposite one of the first electrically isolated conductor segments;

a resistor network for being electrically interconnected between the juxtaposed first electrically isolated conductor segments and conducting regions of the first conductor layer when the transverse force is applied to the second support member, the second support member and the first conductor layer being resiliently deformable in response to the application of the transverse force;

transverse spacer means positioned laterally between each multiple segment conductor ply and transversely between the first and second support members for spacing the first conductor layer from the multiple segment conductor plies.

6. The multiple touch switch apparatus of claim 5 wherein the resistor network comprises a plurality of resistors, each conducting region of the first conductor layer being electrically interconnected to the other conducting regions through at least one of the plurality of resistors.

7. The multiple touch switch apparatus of claim 5 wherein the first conductor layer comprises a unitary conduction ply with the conducting regions being electrically contiguous and the resistor network comprises a semiconductor composition layer positioned on the first conductor layer facing the at least one multiple segment conductor ply.

8. The multiple touch switch apparatus of claim 5 wherein the first conductor layer comprises a unitary conduction ply with the conducting regions being electrically contiguous and the resistor network comprises a semiconductor composition layer positioned on the at least one multiple segment conductor ply.

9. The multiple touch switch apparatus of claim 7 or 8 wherein the semiconductor composition layer is pressure sensitive for providing a variable resistance across the semiconductor composition layer in response to variations in the applied transverse force.

10. The multiple touch switch apparatus of claim 5 or 6 wherein at least one of the first electrically isolated conductor segments of each multiple segment conductor ply has a surface area larger than the surface area of the other first electrically isolated conductor segments.

11. The multiple touch switch apparatus of claims 5 or 6 further comprising:

a first conductor ply affixed to the top surface of the second support member;

a third support member having a bottom surface;

a second conductor ply affixed to the bottom surface of the third support member, facing and transversely spaced from the first conductor ply, the third support member, and the second conductor ply being resiliently deformable for deforming the second conductor ply into electrical conducting relationship with the first conductor ply in response to the application for a transverse force and the third support member.

12. A multiple touch switch apparatus for being selectively activated in response to the application of at least one transverse force comprising:

a first support member having a top surface;

a plurality of first electrically isolated conductor segments laterally displaced from one another, each being responsive to the application of a transverse force;

a second support member having a top surface and a bottom surface;

a unitary conduction ply positioned on the bottom surface facing but transversely spaced from the plurality of first electrically isolated conductor segments, the second support member and the unitary conduction ply being resiliently deformable for deforming the unitary conduction ply into electrically contacting relationship with at least a selected one of the first electrically isolated conductor segments, the unitary conduction ply comprising;

a first conductive layer positioned on the bottom surface of the second support member, and

a first semiconductor composition layer positioned on the first conductive layer for facing the plurality of first electrically isolated conductor segments; and

a transverse spacer positioned laterally between each first electrically isolated conductor segment and transversely between the first and second support members for spacing the unitary conduction ply from the plurality of first electrically isolated conductor segments.

13. The multiple touch switch apparatus of claim 12 wherein the first semiconductor layer is pressure sensitive for providing a variable contact resistance in series with the touch switch apparatus in response to variations in the transverse force applied.

14. The multiple touch switch apparatus of claim 12 or 13 each first electrically isolated conductor segment comprising:

a second conductive layer positioned on the top surface of the first support member; and

a second semiconductor composition layer positioned on the second conductive layer for facing the unitary conduction ply.

15. The multiple touch switch apparatus of claim 14 wherein the first and second semiconductor layers are pressure sensitive for providing a variable contact resistance in series with the touch switch apparatus in response to variations in the transverse force applied.

16. The multiple touch switch apparatus of claim 14 further comprising:

a first conductor ply affixed to the top surface of the second support member;

a third support member having a bottom surface;

a second conductor ply affixed to the bottom surface of the third support member, facing and transversely spaced from the first conductor ply, the third support member, and the second conductor ply being resiliently deformable for deforming the second conductor ply into electrical contacting relationship with the first conductor ply in response to the application of a transverse force and the third support ply.

17. A multiple touch switch apparatus for being selectively activated in response to the application of at least one transverse force comprising:

a first support member having a top surface;

a plurality of first electrically isolated conductor segments laterally displaced from one another, each being responsive to the application of a transverse force, each first electrically isolated conductor segment comprising;

a first conductive layer positioned on the top surface of the first support member, and

a first semiconductor composition layer positioned on the first conductive layer;

a second support member having a top surface and a bottom surface;

a unitary conduction ply positioned on the bottom surface facing but transversely spaced from the plurality of first electrically isolated conductor segments, the second support member and the unitary conduction ply being resiliently deformable for selectively moving the unitary conduction ply into electrical contact with at least one of the first electrically isolated conductor segments in response to the application of the transverse force; and

transverse spacer means positioned laterally between each first electrically isolated conductor segment and transpacing between the first and second support members for spacing the unitary conduction ply from the plurality of first electrically isolated conductor segments.

18. The multiple touch switch apparatus of claim 17 wherein the first semiconductor composition layer in pressure sensitive for providing a variable contact resistance in series with the touch switch apparatus in response to variations in the transverse force applied.

19. The multiple touch switch apparatus of claim 17 further comprising:

a first conductor ply affixed to the top surface of the second support member;

a third support member having a bottom surface;

a second conductor ply affixed to the bottom surface of the third support member, facing and transversely spaced from the first conductor ply, the third support member, and the second conductor ply being resiliently deformable for deforming the second conductor ply into electrical contacting relationship with the first conductor ply in response to the application of a transverse force against the third support ply.