Keypad light guide

Details Keypad light guide Keypad light guide

2006-06-27

2006-06-27

Friedhofer, Michael A. (Department: 2832)

Electricity: circuit makers and breakers

Electric switch details

Indicators

C200S314000, C200S317000

Reexamination Certificate

active

07067753

ABSTRACT:
A light guide for illuminating keys of a keyboard or keypad of a portable electronic device includes an array of apertures, at least one groove and at least a protrusion. The apertures are defined in the light guide and are configured to illuminate the keys via at least a light source. The groove is disposed in one end of the light guide for receiving light from the light source. The light guide can provide a desired uniform illumination by means of fewer light sources, and can improve optical uniformity by eliminating the bright areas occurring adjacent to the light sources.

REFERENCES:
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patent: 5053928 (1991-10-01), Pasco
patent: 5083240 (1992-01-01), Pasco
patent: 5128842 (1992-07-01), Kenmochi
patent: 5711588 (1998-01-01), Rudisill
patent: 6834973 (2004-12-01), Ohkawa
patent: 6909063 (2005-06-01), Nam

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