Light diffusing device
First Claim
1. A light diffusing device comprising a comparatively thick flat smooth transparent base plate having a favorable transparency, a luminous flux incident area defined on the rear side surface of said transparent base plate, a conical concavity formed on the front side surface opposed to said rear side surface of said transparent base plate and aligned with said luminous flux incident area and having a bottom area at least equal to the area of said luminous flux incident area and having a top portion extending toward the interior of said transparent base plate, and a light diffusing reflecting means provided on substantially all the portion except said luminous flux incident area on said rear side surface, whereby, by diffusing and reflecting a luminous flux incident upon said luminous flux incident area within said transparent base plate through said conical concavity and light diffusing reflecting means, the brightness of all said front side surface is kept uniform.
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Accused Products
Abstract
A light diffusing device for obtaining a surface uniform in the brightness by using a luminous flux narrow in the radiating angle comprising a flat smooth transparent base plate having a favorable transparency and including a luminous flux incident area defined on one side surface, a conical concavity formed on the other side surface opposed to said one side surface, aligned with the luminous flux incident area and having a bottom area at least equal to said area and light diffusing reflecting means provided on all the side surfaces except the above mentioned other side surface. Said luminous flux incident area is used as a connecting part with the end portion of a light guide or a containing section for a light source. The above mentioned other side surface serves as a displaying surface for such display medium as of words or signs or as a luminous surface for introducing lights of a uniform brightness into a plurality of light guides.
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Citations
11 Claims
- 1. A light diffusing device comprising a comparatively thick flat smooth transparent base plate having a favorable transparency, a luminous flux incident area defined on the rear side surface of said transparent base plate, a conical concavity formed on the front side surface opposed to said rear side surface of said transparent base plate and aligned with said luminous flux incident area and having a bottom area at least equal to the area of said luminous flux incident area and having a top portion extending toward the interior of said transparent base plate, and a light diffusing reflecting means provided on substantially all the portion except said luminous flux incident area on said rear side surface, whereby, by diffusing and reflecting a luminous flux incident upon said luminous flux incident area within said transparent base plate through said conical concavity and light diffusing reflecting means, the brightness of all said front side surface is kept uniform.
Specification