Illumination – With switch plate or socket
Patent
1991-06-03
1992-07-07
Lazarus, Ira S.
Illumination
With switch plate or socket
362 31, 362 27, 200314, 200DIG47, F21V 3300
Patent
active
051288427
ABSTRACT:
A laniform illumination plate comprising light emitters at one side thereof to irradiate the display section of the necessary keys with uniform illumination, a light-transmitting thin plate which has total reflection inside the plate thickness, the light emitters located in predetermined intervals, with sloped or curved concave reflecting sections formed on the bottom surface of the thin plate corresponding to the location of the keys, or strip shaped concave reflecting sections which run across the width of the thin plate, whereby the light is directed to the corresponding keys on the top surface of the thin plate.
REFERENCES:
patent: 3752974 (1973-08-01), Baker et al.
patent: 4247747 (1981-01-01), Swatten
patent: 4349705 (1982-09-01), Kuhfus
patent: 4822145 (1989-04-01), Staelin
patent: 4890201 (1989-12-01), Toft
patent: 4914553 (1990-04-01), Hamada et al.
Heyman L.
Lazarus Ira S.
Sunarrow Co., Inc.
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