Display board

Details Display board Display board

1991-11-21

1993-09-21

Cole, Richard R.

Illumination

Illuminated scale or dial

Internal light source

362 30, B01D 1128

Patent

active

052474291

ABSTRACT:
A display board has a light transmitting substrate illuminated by a light source at the back side, a illuminance adjusting layer having a plurality of light reflective dots and formed on the surface at the front side of the substrate, and a colored light transmitting image layer formed on the illuminance adjusting layer. This display board is manufactured by forming a illuminance adjusting layer and image layer sequentially on the same side of the substrate.

REFERENCES:
patent: 2395718 (1946-02-01), Bradley
patent: 3503365 (1970-03-01), Baez et al.
patent: 4688156 (1987-08-01), Suzuki et al.
patent: 4729067 (1988-03-01), Ohe
patent: 4729068 (1988-03-01), Ohe
patent: 4860171 (1989-08-01), Kojima

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