Back-light device

Details Back-light device Back-light device

1988-09-22

1990-04-10

Lazarus, Ira S.

Illumination

Illuminated scale or dial

Internal light source

362216, 362223, 362355, G01D 1128

Patent

active

049165801

ABSTRACT:
In order to make the brightness approximately uniform over a diffusion board, a back-light device is provided with a light transmission controlling film having a planar form in a shape of a projection of the lamp on the diffusion board. The film is disposed in parallel to the lamp axis between the lamp and the diffusion board.

REFERENCES:
patent: 2275621 (1942-03-01), Gardinor
patent: 4222435 (1980-09-01), Kumagai
patent: 4568080 (1986-02-01), Yokoi
patent: 4766524 (1988-08-01), Ogawa et al.

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