Light guide for a display or keyboard

Details Light guide for a display or keyboard Light guide for a display or keyboard

1996-03-08

1998-05-05

Lazarus, Ira S.

Illumination

Revolving

362 23, 362 24, 362 26, F21V 704, G01D 1128, H04M 122

Patent

active

057464936

ABSTRACT:
A light guide for illuminating a display and/or keyboard device is formed from translucent material as a planar element having a peripheral edge. A plurality of arcuately shaped light coupling recesses are formed on one side to transmit light from light sources substantially uniformly into the light guide. A plurality of light reflecting recesses are formed in the peripheral edge to reflect light at the edge back into the light guide in a manner useful for illuminating the keys of the device.

REFERENCES:
patent: 2699141 (1955-01-01), Gaguski
patent: 2900949 (1959-08-01), Baker
patent: 3774021 (1973-11-01), Johnson
patent: 3892959 (1975-07-01), Pulles
patent: 4124879 (1978-11-01), Schoemer
patent: 4918577 (1990-04-01), Furudate
patent: 5053928 (1991-10-01), Pasco
patent: 5083240 (1992-01-01), Pasco
patent: 5130897 (1992-07-01), Kuzma
patent: 5537300 (1996-07-01), Kraines et al.

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