Integrated light-guide and dome-sheet for keyboard illumination

Details Integrated light-guide and dome-sheet for keyboard illumination Integrated light-guide and dome-sheet for keyboard illumination

2005-08-09

2005-08-09

O'Shea, Sandra (Department: 2875)

Illumination

Illuminated scale or dial

Telephone dial

C362S026000, C362S035000, C362S577000

Reexamination Certificate

active

06926418

ABSTRACT:
An integrated light guide for use in an electronic device having a plurality of key buttons to allow a user to input signals in the device, the light guide having a plurality of domes used as touch areas of the key buttons and a plurality of light escapement areas disposed at the domes. When coupled to a light source, a portion of the light received by the light guide from the light source escapes from the light escapement areas to illuminate the key buttons. Preferably, each dome has one or more electrically conducting patches provided under the dome such that when a touch area is pushed by the user, these patches are caused to interact with an electronic circuit placed under the light guide for activating a key.

REFERENCES:
patent: 4197439 (1980-04-01), Mecklenburg et al.
patent: 5664667 (1997-09-01), Kenmochi
patent: 5669486 (1997-09-01), Shima
patent: 5711588 (1998-01-01), Rudisill
patent: 5871088 (1999-02-01), Tanabe
patent: 5975711 (1999-11-01), Parker et al.
patent: 6246169 (2001-06-01), Pruvot
patent: 6369801 (2002-04-01), Boireau et al.
patent: 6670750 (2003-12-01), Hanahara et al.
patent: WO 0123805 (2001-04-01), None

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