Method of making flexible pressure sensitive switch

• US 4,131,991 A
• Filed: 05/11/1977
• Issued: 01/02/1979
• Est. Priority Date: 10/09/1975
• Status: Expired due to Term

• Current Assignee: Northern Engraving Corporation (Huaxiang Group Company Limited)
• Original Assignee: Northern Engraving Corporation (Huaxiang Group Company Limited)
• Inventors: Riniker, James P.
• Primary Examiner(s): DiPalma, Victor A.
• Application Number:
  US05/796,002
• Time in Patent Office: 601 Days
• Field of Search: 29/622, 29/625, 200/5 R, 200/5 A, 200/159 B, 200/308, 200/314, 200/317, 200/86 R, 200/293-296, 200/329, 200/340, 428/40, 174/68.5, 156/300, 156/277
• US Class Current: 29/622
• 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 2219/028 Printed information
• CPC Class Codes: H01H 2229/006 Pad transfer printing
• CPC Class Codes: H01H 2229/028 Adhesive
• CPC Class Codes: H01H 2231/022 Telephone handset
• CPC Class Codes: H01H 2231/026 Car
• CPC Class Codes: Y10T 156/1093 with covering of discrete laminae with additional lamina
• CPC Class Codes: Y10T 29/49105 Switch making

Abstract

A flexible, self-biasing switching element is disclosed herein for closing a circuit by flexing the element from an initial non-contacting position to a second contacting position and for opening the circuit by releasing the element and permitting it to return to a non-contacting position from the contacting position. The element includes a flexible non-conductive substrate having on one side thereof a plurality of spaced conductive contacts or areas. A two-sided pressure sensitive adhesive film for mounting the element is die cut and applied to the substrate in a manner so as to surround the conductive contact areas. The adhesive film provides an insulating medium between the contact points so as to prevent transmission of current between the contact points.

Claims

1. A method for manufacturing a unitary, self-biasing and flexible switching element which includes a flexible and electrically non-conductive substrate, a plurality of electrically conductive contact area means carried by the substrate, indicia carried by said substrate and in aligned relation to said contact area means so as to indicate individual contact areas which may be activated, and apertured insulating and bonding means carried by said substrate and in surrounding relationship with each of said contact area means, said method including the steps of:

providing flexible and electrically non-conductive substrate;

printing said contact area means on one side of said substrate with silver; and

applying said apertured insulating and bonding means to the same side of said substrate as said contact area means and in surrounding relationship to said contact area means so as to insulate contact area means from one another and so as to permit said element to be bonded to a surface.

2. A method as in claim 1, wherein said indicia is a decorative ink layer and said method further includes the step of printing said ink layer on said substrate.

3. A method as in claim 2, wherein said ink layer is printed on the same side of said substrate as said contact area means and where the ink layer is printed on said substrate prior to the printing of said contact area means so that said contact area means are subsequently printed on said ink layer means.

4. A method as in claim 3, wherein said substrate is transparent and said indicia is visible therethrough.