Uniform illumination plate
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United States of America Patent
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Jul 7, 1992
Grant Date -
N/A
app pub date -
Jun 3, 1991
filing date -
Jun 3, 1991
priority date (Note) -
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status (Latency Note)
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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.
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