Keyboard with illuminated keys

• US 4,163,883 A
• Filed: 12/30/1977
• Issued: 08/07/1979
• Est. Priority Date: 12/30/1977
• Status: Expired due to Term

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Boulanger, Henry J.
• Primary Examiner(s): Ross, Herbert F.
• Application Number:
  US05/866,105
• Time in Patent Office: 585 Days
• Field of Search: 200/314, 200/340, 200/DIG. 47, 200/312, 200/313, 362/31, 362/32, 40/546, 350/96.11, 350/96.23, 350/96.24
• US Class Current: 200/314
• CPC Class Codes: H01H 13/83 characterised by legends, e.g. Braille, liquid crystal displays, light emitting or optical elements
• CPC Class Codes: H01H 2221/044 Elastic part on actuator or casing
• CPC Class Codes: H04M 1/22 Illumination; Arrangements for improving the visibility of characters on dials

Abstract

A keyboard for use in an automotive control panel or the like has a pattern of switches on a base and has a key member overlying the switches, the key member having a frame mounting the member relative to the base and having a plurality of keys each comprising a button integrally joined to the frame by a self-hinge portion of the key so that the keys overly the respective switches and are individually movable for selectively actuating the switches. The key member is molded of a light transmitting material and an opaque escutcheon is fitted over the key member to permit the key buttons to extend through openings in the escutcheon. Light source means are arranged to direct light into the frame part of the key member so that the light is directed through the frame and along the lengths of the self-hinge portions of the keys into the button portions of the keys at least partly by internal reflection of light within the light-transmitting material of the key member, thereby to illuminate the buttons of the keys in a compact, economical keyboard structure.

Claims

1. In a keyboard system having control means mounted on a base and a member overlying the control means, said member having a frame mounted the member relative to the base and having a key with a button portion integrally joined to the frame by a self-hinge portion of the key movable for selectively actuating the control means, the improvement in which the key member is formed of a light-transmitting material, and light source means direct light into the material of the frame to be conducted at least partly by internal reflection within the member material into the button portion of the key for illuminating the button portion of the key.

2. In a keyboard system having a plurality of control means mounted in a pattern on a base and a molded key member overlying the pattern of control means, said member having a frame mounted the member relative to the base and having a plurality of keys each with a button portion integrally joined to the frame by a self-hinge portion of the key so that the keys are disposed over the respective control means for movement to selectively actuate the respective control means, the improvement in which the key member is molded of a light-transmitting material and light source means direct light into the material of the frame to be conducted along the self-hinge portions of the member into the button portions of the keys at least partly by internal reflection of the light within the member material for illuminating the button portions of the keys.

3. A keyboard system as set forth in claim 2 wherein said member frame has first surface means reflecting said light along the self-hinge portions of the keys, said button portions of the keys extend upwardly from distal ends of said self-hinge portions to dispose tops of the button portions in a plane above said self-hinge portions of the member, and said self-hinge portions of the member have respective second surface means at the distal ends thereof reflecting said light through the tops of the button portions of the keys.

4. A keyboard system as set forth in claim 3 wherein the self-hinge portion of the member joined to each key has a groove extending transversely across the self-hinge portion defining a preferred bending location in the self-hinge portion, said groove having juxtaposed opposite lateral side surfaces for permitting light directed along the self-hinge portions to pass through said side surfaces of the grooves to be conducted through the material of the self-hinge portion by internal reflection of the light within said material.

5. A keyboard system as set forth in claim 4 wherein the distal end of the self-hinge portion of the member has a depending portion accommodating part of said second surface means and disposed so that light directed along the length of the self-hinge portion adjacent to the self-hinge portion is received within said depending portion to be internally reflected from said second surface means into the button portion of the key.

6. A keyboard system as set forth in claim 3 having opaque escutcheon means fitted over said keyboard member, said escutcheon means having openings therein and having said tops of the keybutton portions extending through said openings to be illuminated in said openings.

7. A keyboard system as set forth in claim 6 having opaque cover means on said button portions of the keys, said cover means having openings therein at said illuminated tops of the key button portions to permit the illuminated tops of the button portions to be visible through the cover openings.