Display board illuminating device for passive displays
First Claim
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1. A display board illuminating device for illuminating a display board, comprising:
- a light guide plate placed to face the back of said display board to be illuminated, said plate having at least two side ends and a back surface; and
a light source disposed to face at least one of said side ends of said light guide plate and crossing a longitudinal axis of said light guide plate, wherein an angle between a portion of said side end at said light source and the back surface of said guide plate is less than 90°
so that said portion of said side end is inclined toward the center of said light guide plate with respect to a normal of said light guide plate directed to said display board.
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Abstract
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.
198 Citations
10 Claims
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1. A display board illuminating device for illuminating a display board, comprising:
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a light guide plate placed to face the back of said display board to be illuminated, said plate having at least two side ends and a back surface; and a light source disposed to face at least one of said side ends of said light guide plate and crossing a longitudinal axis of said light guide plate, wherein an angle between a portion of said side end at said light source and the back surface of said guide plate is less than 90°
so that said portion of said side end is inclined toward the center of said light guide plate with respect to a normal of said light guide plate directed to said display board. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification