Keypad light guide

Details Keypad light guide Keypad light guide

2005-11-01

2008-08-05

Payne, Sharon E (Department: 2875)

Illumination

Edge lighted panel

Light modifier for edge lit light source

C362S027000, C362S621000, C362S616000

Reexamination Certificate

active

07407314

ABSTRACT:
A light guide (20) for illuminating keys of a keyboard or keypad of a portable electronic device, includes an array of apertures (22) and a groove (21) at one end of the light guide. The apertures are configured to illuminate the keys via a light source (10). The light source is disposed adjacent to the groove. A peripheral wall around each aperture is configured partially as a reflecting surface, and partially as a transmitting surface. The reflecting angle of the reflecting surface is larger than a critical total internal reflection angle so as to transfer the light farther. The light guide has a desired uniform light by means of a light source. This provides the portable electronic device consuming little power.

REFERENCES:
patent: 3114854 (1963-12-01), Koury
patent: 4177501 (1979-12-01), Karlin
patent: 5029981 (1991-07-01), Thompson
patent: 5053928 (1991-10-01), Pasco
patent: 5746493 (1998-05-01), Jonsson et al.
patent: 6295405 (2001-09-01), Jannson et al.
patent: 6473554 (2002-10-01), Pelka et al.

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