Flat lighting device

Optical: systems and elements – Diffusing of incident light

Patent

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Details

362 31, 362 32, 349 61, G02B 502, G02B 500, F21V 704

Patent

active

056172516

ABSTRACT:
An improved flat lighting device is provided. The flat lighting device comprises a light transmission member having a luminous surface formed on the front side thereof, a reflection surface on the rear side of said luminous surface, and an incident surface, and further comprises a light source and a reflecting mirror in the vicinity of the side perpendicular to said luminous surface. The thickness of the light transmission member between the luminous surface and the reflection surface is increased wider than that of the incident surface, the lower end of said incident surface is in contact with the reflection surface, said light source and said reflecting mirror are provided closer to the center of the light transmission member inside the end of the luminous surface, said inclined surface is formed by connecting the upper end of the incident surface and the end of the luminous surface, and said inclined surface is provided with a reflection function. According to the invention, the luminous surface can be more luminous owing to reflection by the inclined surface, and the flat lighting device itself can be formed so that the area is approximately equal to the display area of a liquid crystal display for lighting.

REFERENCES:
patent: 4714983 (1987-12-01), Lang
patent: 4974122 (1990-11-01), Shaw
patent: 5040098 (1991-08-01), Tanaka et al.
patent: 5404277 (1995-04-01), Lindblad
patent: 5485354 (1996-01-01), Ciupke et al.

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