Card – picture – or sign exhibiting – Display card – Having a curved display panel
Patent
1976-01-26
1977-11-29
Pitrelli, John F.
Card, picture, or sign exhibiting
Display card
Having a curved display panel
401522, 362 31, G09F 1318
Patent
active
040599167
ABSTRACT:
The light diffusing device for illumination purpose includes a light source, a thin transparent base plate having a front illuminating surface and a rear surface and arranged with its side edge adjacent to the light source so as to receive light therefrom and a light reflecting plate located adjacent to or in contact with the rear surface of the base plate. The rear surface is treated so as to have a directional light reflecting property as well as a light transmitting property so that a portion of the light received from the light source is directly emanated from the front surface of the base plate while a portion of the remainder of the light is repeatedly reflected by the rear surface and the front surface predominantly toward the opposite side edge of the base plate so as to be emanated from the front surface, the remainder of the light being reflected by the reflecting plate after passing through the rear surface, thereby permitting the light to be emanated from the front surface uniformly over the entire area thereof. The light diffusion device provides a surface illuminating device for various appliances.
REFERENCES:
patent: 2523290 (1950-09-01), Gardner
patent: 2831453 (1958-04-01), Hardesty
patent: 3132810 (1964-05-01), Ostensen
patent: 3242328 (1966-03-01), Kapany et al.
patent: 3328570 (1967-06-01), Baichunas
patent: 3464133 (1969-09-01), DeDoray
Makita Jun-ichi
Mizohata Yukio
Tachihara Noribumi
Copal Company Limited
Pitrelli John F.
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