Surface illuminating apparatus

Details Surface illuminating apparatus Surface illuminating apparatus

1990-11-08

1992-01-07

Lazarus, Ira S.

Illumination

Revolving

362 26, 362 27, 362331, F21V 502

Patent

active

050796755

ABSTRACT:
The present invention relates to a surface illuminating apparatus for illuminating an object or a space in a room or the like and an object of the invention is to provide a surface illuminating apparatus in which an illuminance can be increased and can be made uniform and a transparent plate can be made thin. The surface illuminating apparatus according to the invention comprises: at least one laminated flat plate-like transparent plate; a first reflecting unit arranged on one surface of the transparent plate; at least one light source arranged near side edge portions of the transparent plate; a second reflecting unit arranged around the light source; and a plurality of groove portions which are formed on the surface of the transparent plate on the side opposite to the first reflecting unit and each of which is constructed by two inclined surfaces, wherein inclination angles of the inclined surfaces of the groove portion on the side opposite to the light source to the transparent plate are set to values within a range such that the lights which enter from the light source into the transparent plate in parallel with the surface thereof are totally reflected by the inclined surfaces and the totally reflected lights are not totally reflected by the other surface of the transparent plate.

REFERENCES:
patent: 2623313 (1952-12-01), Fuchs
patent: 2671163 (1954-03-01), Minter
patent: 2831453 (1958-04-01), Hardesty
patent: 4765701 (1988-08-01), Cheslak
patent: 4918577 (1990-04-01), Furudate
patent: 4947300 (1990-08-01), Wen

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