Touch panel mechanism

• US 4,228,330 A
• Filed: 07/10/1978
• Issued: 10/14/1980
• Est. Priority Date: 07/10/1978
• Status: Expired due to Term

• Current Assignee: Amana Refrigeration, Inc. (Whirlpool Corporation)
• Original Assignee: Litton Systems Incorporated (Northrop Grumman Corporation)
• Inventors: Larson, Gerald L.
• Primary Examiner(s): Scott, James R.
• Application Number:
  US05/923,305
• Time in Patent Office: 827 Days
• Field of Search: 200/5 A, 200/159 B, 200/292, 200/86 R
• US Class Current: 200/5.00A
• 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 2207/04 Details of printed conductors
• CPC Class Codes: H01H 2209/018 flat, smooth or ripple-free
• CPC Class Codes: H01H 2209/048 metallic
• CPC Class Codes: H01H 2227/002 Layer thickness
• CPC Class Codes: H01H 2229/028 Adhesive
• CPC Class Codes: H01H 2229/038 Folding of flexible printed circuit
• CPC Class Codes: H01H 2231/012 Household appliance
• CPC Class Codes: H01H 2231/03 Elevator
• CPC Class Codes: H01H 2239/008 Static electricity considerations
• CPC Class Codes: H01H 2239/038 Anti-vandalism
• CPC Class Codes: H01H 2239/046 Getter

Abstract

An improved touch panel switching device including a thin, flexible plastic sheet foldable to locate respective switch contactors and contacts opposite each other, an insulating spacer member intermediate the switch contactors and contacts and having openings to enable contactor and contact communication, a rigid backing on one side and a thin, metal sheet on the other side of the plastic sheet, the metal sheet being relatively stiff and depressable at a switch position to enable engagement of a respective switch contactor and contact.

Claims

1. In a touch panel switch device having switch contactors positioned on a flexible, non-conductive surface aligned with respective switch contacts positioned on an opposite non-conductive surface to provide a plurality of switch contact positions, said flexible surface being depressable to enable engagement between a respective contactor and contact, the improvement comprising:

a non-conductive spacer intermediate said surfaces including apertures therein extending over more than one of said switch contact positions; and

a thin metal sheet overlying and immediately adjacent said flexible, non-conductive surface, said metal sheet being depressable at a switch contact position to depress said non-conductive surface and only enable engagement of the respective contactor and contact associated therewith wherein the thickness of said non-conductive spacer and the stiffness of said thin metal sheet combine to provide said touch panel switch device with the hard tactile feel characteristic of glass-capacitive touch panels.

2. In a touch panel switch device having switch contactors positioned on a flexible, non-conductive surface aligned with respective switch contacts positioned on an opposite non-conductive surface to provide a plurality of switch contact positions, and including a non-conductive spacer maintaining said switch contactors spaced from said switch contacts in the switch non-operative mode, said flexible surface being depressable to enable engagement between a respective contactor and contact in the switch operative mode, the improvement comprising:

a thin, metal sheet overlying and immediately adjacent said flexible, non-conductive surface,

said metal sheet having a thickness at least equal to said space between said switch contactors and contacts in the switch non-operative mode, and

said metal sheet being depressable at a switch contact position to depress said non-conductive surface and only enable engagement of the respective switch contactor and contact associated therewith, said metal sheet having sufficient stiffness to provide a substantially firm tactile operating characteristic to said touch panel as said switches are depressed.

4. A touch panel switch device according to claim 2, wherein said metal sheet thickness is about 0.008 to 0.015 inch and said space between said switch contactors and contacts in the switch non-operative mode is about 0.003 to 0.008 inch.

5. A touch panel switch device according to claim 2, wherein said metal sheet thickness is about 0.012 inch and said space between said switch contactors and contacts in the switch non-operative mode is about 0.005 inch.

8. A touch panel switch device according to claims 2 or 3, wherein said spacer includes apertures therein extending over more than one of said switch contact positions.

3. In a touch panel switch device having switch contactors positioned on a flexible, non-conductive surface aligned with and spaced by an insulating spacer from respective switch contacts positioned on an opposite non-conductive surface to provide a plurality of switch contact positions, said flexible surface being depressable to enable engagement between a respective contactor and contact, the improvement comprising:

a thin, metal sheet overlying and immediately adjacent said flexible, non-conductive surface,

said metal sheet having sufficient stiffness characteristics to be depressable at a switch contact position and only enable engagement of the respective switch contactor and contact associated therewith, and to provide a firm, tactile feel to said touch panel switch device as said switch contacts are operated, whereby movement of said flexible, non-conductive surface is substantially imperceptible to the operator.

6. A touch panel switch device according to claim 3, wherein said metal sheet comprises 3/4 hardness aluminum.

7. A touch panel switch device according to claim 6, wherein said metal sheet has a thickness about 0.012 inch and said respective switch contacts are spaced about 0.005 inch apart.

9. A touch panel switch device comprising:

a non-conductive surface having a plurality of conductive switch contacts thereon defining respective switch contact positions;

means for maintaining said non-conductive surface rigid during operation of said switch device;

an insulating spacer adjacent said non-conductive surface having apertures therein at said switch contact positions;

a relatively stiff metal sheet adjacent said insulating spacer on the side opposite from said switch contacts, said metal sheet having sufficient stiffness characteristics to be depressable at a switch contact position to only enable engagement of said metal sheet with the switch contacts associated with said switch position and to provide a substantially firm tactile feel to said touch panel during depression of said switch contacts.

10. A touch panel switch device having the hard, non-tactile feel of glass capacitive touch panels but incorporating the switch operation of flexible membrane switches, said device comprising:

a substantially rigid backing member;

a first flexible non-conductive surface positioned adjacent said rigid backing member and having switch contacts positioned thereon;

an insulating spacer positioned adjacent said first non-conductive surface and having apertures therein in registry with said switch contacts;

a second flexible non-conductive surface positioned adjacent said insulating spacer and having switch contactors positioned thereon in registry with said apertures in said spacer, whereby depression of each of said switch contactors brings it into contact with a corresponding one of said switch contacts;

a thin metal sheet overlying and adjacent to said second flexible non-conductive surface, said metal sheet having indicia thereon arranged in registry with corresponding switch contactors on said second flexible non-conductive surface such that depression of said metal sheet in the area of said indicia causes a corresponding switch contactor to engage a corresponding switch contact, said metal sheet having sufficient stiffness whereby the depression thereof is substantially imperceptible providing said touch panel with a hard, tactile feel.