Vented membrane-type touch panel

• US 4,066,855 A
• Filed: 11/22/1976
• Issued: 01/03/1978
• Est. Priority Date: 11/22/1976
• Status: Expired due to Term

• Current Assignee: St Clair Intellectual Property Consultants Incorporated
• Original Assignee: Control Data Corporation (Ceridian HCM Holding, Inc.)
• Inventors: Zenk, George Edward
• Primary Examiner(s): Scott, James R.
• Application Number:
  US05/744,209
• Time in Patent Office: 407 Days
• Field of Search: 200/5 R, 200/5 A, 200/159 B, 200/86 R, 200/275, 200/306, 200/308, 200/310, 200/313, 200/314
• 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 13/82 characterised by contact space venting means
• CPC Class Codes: H01H 2213/002 with external pressure

Abstract

A location sensitive touch panel for use on a rigid substrate. The substrate carries a first set of conductive strips. A resilient plastic membrane overlaying it carries a second set of conductive strips orthogonal to and spaced from the first set. Finger pressure can cause electrical contact between any one of the first set of strips and any one of the second set of strips. The substrate may be either flat or curved, with the membrane conforming to its contour. A vent in the membrane allows the membrane to assume its natural shape more quickly by allowing air to flow between the substrate and the membrane.

Claims

1. A transparent switch matrix to be carried on the face of a rigid insulator substrate having a predetermined radius of curvature, and comprising:

a. a plurality of spaced apart transparent conductive first strips firmly adhering to the face of the substrate;

b. a transparent resilient membrane having an undistorted contour substantially alike the predetermined contour, and attached about its periphery to the face of the substrate in a position matching the membrane contour to the substrate contour and spaced apart from the first strips thereon in a predetermined area of the membrane, and having a vent permitting air flow into the space between the membrane and the substrate; and

c. a plurality of transparent, flexible, spaced apart conductive second strips firmly adhering to the resilient membrane surface facing the substrate, each of said second strips located in the area spaced apart from the first strips and thinner than the spacing therefrom, and each of said second strips crossing at least two first strips.