Switch assembly having electrically illuminated character display devices between transparent actuators and switch arrays

• US 4,022,993 A
• Filed: 06/09/1975
• Issued: 05/10/1977
• Est. Priority Date: 06/09/1975
• Status: Expired due to Term

• Current Assignee: Litton Systems Incorporated
• Original Assignee: Litton Systems Incorporated
• Inventors: Shattuck, Ronald Corroalles
• Primary Examiner(s): Scott, James R.
• Application Number:
  US05/585,203
• Time in Patent Office: 701 Days
• Field of Search: 200/5 R, 200/5 A, 200/159 B, 200/302, 200/308, 200/317, 200/315, 200/340, 200/310-314, 200/316, 340/365 R, 340/365 A, 340/365 C, 340/365 L, 313/500, 313/505, 313/510, 313/511, 313/512
• US Class Current: 200/314
• 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 2209/082 transparent
• CPC Class Codes: H01H 2217/038 Prompting
• CPC Class Codes: H01H 2219/016 programmable
• CPC Class Codes: H01H 2219/028 Printed information
• CPC Class Codes: H01H 2219/044 Edge lighting of layer
• CPC Class Codes: H01H 2219/046 above switch site
• CPC Class Codes: H01H 2221/042 Foam
• CPC Class Codes: H01H 2221/064 Limitation of actuating pressure
• CPC Class Codes: H01H 2223/002 sealed
• CPC Class Codes: H01H 2223/034 Bezel

Abstract

A switch assembly having a lighted display module for programmable character display where the module is an active part during switch actuation since the module is displaced by and transmits an applied switch actuating force. The switch assembly consists of electromechanical switch arrays having the illuminated solid-state programming character display (LED-type) disposed above the switch array. Transparent pushbuttons are illuminated when depressed. The electromechanical switch arrays consist of a matrix of conventional dome switches although other conventional types of switches may be used.

Claims

1. A keyboard assembly, comprising:

an array of electromechanical switches;

a thin flexible base plate adjacent the array of switches capable of transmitting actuating force to the switches;

a resilient cushion mounted between the flexible base plate and the array of switches for absorbing a portion of the actuating force applied to the devices and for dissipation of snap back forces from the switches; and

an array of electrically programmable illuminated character display devices positioned at selected locations on the base plate to correspond to the locations of individual switches in the electromechanical switch array.

2. The keyboard assembly as claimed in claim 1, further comprising:

a transparent flexible keypad mounted adjacent the base plate opposite the switch array for transmitting the actuating force to the flexible base plate.

3. The keyboard assembly as claimed in claim 2, further comprising:

transparent key caps positioned at selected locations on the keypad to correspond to the locations of the display devices on the flexible base plate.

4. The keyboard assembly as claimed in claim 2, further comprising:

an open sided housing having the switch array, flexible base plate, and keypad positioned therein, the keypad covering the open side; and

a rigid switch panel adjacent the keypad and forming a seal therewith around the perimeter of the open side of the housing, the switch panel including transparent actuating force transmitting means positioned at selected locations on the switch panel to correspond to the locations of the display devices on the flexible base plate.

5. The keyboard assembly as claimed in claim 4 wherein the transparent actuating force transmitting means are apertures in the switch panel.

6. The keyboard assembly as claimed in claim 4, further comprising:

transparent keycaps positioned at selected locations on the keypad to correspond to the locations of the display devices on the flexible base plate and extending through the apertures in the switch panel.