ILLUMINATED KEYPAD

• US 20100243416A1
• Filed: 03/27/2009
• Published: 09/30/2010
• Est. Priority Date: 03/27/2009
• Status: Abandoned Application

• Current Assignee: Avago Technologies ECBU IP Singapore Pte Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies ECBU IP Singapore Pte Limited (Broadcom, Inc.)
• Inventors: Chuin, Ng Fook, Fong, Chung Muh, Guan, Ko Choon, Tatt, Lee Sian
• Application Number:
  US12/413,484
• Publication Number:
  US 20100243416A1
• Time in Patent Office: Days
• US Class Current: 200/310
• CPC Class Codes: H01H 13/83 characterised by legends, e.g. Braille, liquid crystal displays, light emitting or optical elements
• CPC Class Codes: H01H 2219/062 Light conductor
• CPC Class Codes: H01H 2219/064 Optical isolation of switch sites
• CPC Class Codes: H01H 2221/05 Force concentrator; Actuating dimple
• CPC Class Codes: H01H 2221/07 transparent

Abstract

Illuminated keypads are disclosed herein. One embodiment includes first and second light guides having a compressible material located therebetween. The material blocks light from traveling between the light guides.

Claims

1. An illuminated keypad comprising:

an outer layer comprising a first portion and a second portion, wherein said first portion and said second portion are depressable, said outer layer comprising an outer layer first side and an outer layer second side;

a first light guide having a first light guide first surface and a first light guide second surface, wherein said first light guide first surface is located adjacent said outer layer second side proximate said first portion;

a second light guide having a second light guide first surface and a second light guide second surface, wherein said second light guide first surface is located adjacent said outer layer second side proximate said second portion;

a substrate extending at least between said first light guide second side and said second light guide second side;

a first switch attached to said substrate and located proximate said first light guide second surface;

a second switch attached to said substrate and located proximate said second light guide second surface;

a space between said first light guide and said second light guide; and

a compressible material located in said space in the light paths between said first light guide and said second light guide.

2. The keypad of claim 1 and further comprising a light guide holder located between said outer material second surface and said first light guide first surface.

3. The keypad of claim 1 and further comprising a light guide holder extending between at least said first light guide first surface and said second light guide first surface.

4. The keypad of claim 1 and further comprising a light guide holder extending between at least said first light guide first surface and said second light guide first surface, wherein said compressible material extends between said substrate and said light guide holder.

5. The keypad of claim 1, wherein said compressible material is a closed cell material.

6. The keypad of claim 1, wherein said compressible material comprises urethane.

7. The keypad of claim 1, wherein said compressible material is black.

8. The keypad of claim 1, wherein said compressible material is a foam material.

9. The keypad of claim 1, wherein said first switch comprises a metal dome extending from said substrate.

10. The keypad of claim 1, wherein an icon is located on said outer layer in said first portion and wherein light emitted by said first light guide reacts with said icon.

11. The keypad of claim 1, wherein at least some light emitted by said first light guide passes through at least a portion of said first portion of said outer layer.

12. The keypad of claim 1 and further comprising first protrusion extending from said outer layer second side in the proximity of said first portion.

13. An illuminated keypad comprising:

an outer layer comprising a first portion and a second portion, wherein said first portion and said second portion are depressable, said outer layer comprising an outer layer first side and an outer layer second side;

a first light guide having a first light guide first surface and a first light guide second surface, wherein said first light guide first surface is located adjacent said outer layer second side proximate said first portion;

a first protrusion extending from said outer layer second side proximate said first portion;

a second light guide having a second light guide first surface and a second light guide second surface, wherein said second light guide first surface is located adjacent said outer layer second side proximate said second portion;

a second protrusion extending from said outer layer second side proximate said second portion;

a light guide holder extending between at least said first protrusion and said second protrusion;

a substrate extending at least between said first light guide second side and said second light guide second side;

a first switch attached to said substrate and located proximate said first light guide second surface;

a second switch attached to said substrate and located proximate said second light guide second surface;

a space between said first light guide and said second light guide; and

a compressible material located in said space in the light paths between said first light guide and said second light guide.

14. The keypad of claim 13, wherein said compressible material is a closed cell material.

15. The keypad of claim 13, wherein said compressible material comprises urethane.

16. The keypad of claim 13, wherein said compressible material is black.

17. The keypad of claim 13, wherein said compressible material is a foam material.

18. The keypad of claim 13, wherein said first switch comprises a metal dome extending from said substrate.

19. The keypad of claim 13, wherein an icon is located on said outer layer in said first portion and wherein light emitted by said first light guide reacts with said icon.