Indicating instrument having light conducting plate

Details Indicating instrument having light conducting plate Indicating instrument having light conducting plate

1998-11-03

2000-05-23

O'Shea, Sandra

Illumination

Illuminated scale or dial

Internal light source

362 26, 362 23, 362307, 362327, G01D 1128

Patent

active

060658460

ABSTRACT:
An indicating instrument has a generally straight illumination lamp and a light conducting plate. The light conducting plate has V-shaped notches near the lamp at the back thereof and curved surfaces at the front thereof. The V-shaped notches have inclined surface for receiving light from the lamp and transmitting it to the curved surfaces. The light from the lamp is totally reflected by the curved surface to illuminate a dial plate effectively.

REFERENCES:
patent: 4218726 (1980-08-01), Fukasawa et al.
patent: 4771368 (1988-09-01), Tsukamoto et al.
patent: 5247429 (1993-09-01), Iwase et al.
patent: 5678912 (1997-10-01), Ayres et al.

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