Display board illuminating device for passive displays

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United States of America Patent

PATENT NO 5070431





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A display board illuminating device includes a light guide plate arranged to face the back of a display board and a light source disposed to face the side end of the light guide plate. The side end of the light guide plate is inclined toward the center of the light guide plate in the direction of the display board. By this configuration an angle of an optical axis refracted at the surface of the side end and incident into the light guide plate with respect to a main surface of the light guide plate, so that the whole area of the display board is illuminated efficiently.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
Pioneer Electronic CorporationTOKYO572

International Classification(s)

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Inventor Name Address # of filed Patents Total Citations
Kayama, Tsutomu Kawagoe, JP 2 134
Kitazawa, Hideki Kawagoe, JP 1 125
Nagai, Yoshiaki Kawagoe, JP 7 358
Takeuchi, Shogo Kawagoe, JP 3 156
Tanimoto, Kohichi Kawagoe, JP 1 125
Terada, Ryohei Kawagoe, JP 9 125
Utsugi, Nobuo Kawagoe, JP 5 220

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