Light guide for use in a keypad

Details Light guide for use in a keypad Light guide for use in a keypad

2007-03-16

2009-06-09

Sawhney, Hargobind S (Department: 2885)

Illumination

Edge lighted panel

Light guide

C362S085000, C362S030000

Reexamination Certificate

active

07543971

ABSTRACT:
A light guide for a keypad includes a plurality of through hole portions adapted to correspond respectively to keys on the keypad. Each of the through hole portions is adapted to receive at least a part of the corresponding key, and to receive light incident thereinto from at least one light source. Each of selected ones of the through hole portions has a contour with a non-curved contour portion that includes a light incident face and a reflecting face forming an angle with the light incident face. Light incident on the reflecting face is reflected into at least one other through hole portion. The light guide can also be configured to have a tree-like structure.

REFERENCES:
patent: 4343975 (1982-08-01), Sado
patent: 5746493 (1998-05-01), Jonsson et al.
patent: 6026283 (2000-02-01), Stephenson
patent: 7407314 (2008-08-01), Hsu et al.
patent: 2007/0062793 (2007-03-01), Hung
patent: M266654 (2005-06-01), None

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