Illumination – Edge lighted panel – Light guide
Reexamination Certificate
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
Lee Kun-Neng
Tseng Yi-Hsiang
Lite-On Technology Corporation
Rosenberg , Klein & Lee
Sawhney Hargobind S
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