Uniform illumination device for the dial of a display device

Details Uniform illumination device for the dial of a display device Uniform illumination device for the dial of a display device

1998-01-30

1999-11-16

Tso, Laura K.

Illumination

Illuminated scale or dial

Edge illuminated modifier or light rod/pipe

368 67, 362 30, 362 31, G04B 1930, F21V 800

Patent

active

059844850

ABSTRACT:
Illumination device for the dial (4) of a display device formed by a case (1) sealed by a crystal (8) arranged above the dial (4) and held by a fitting ring (9), said device including at least one light source (13, 33, 35, 43, 53) arranged in at least one recess arranged in at least one light guide (20, 30, 40, 50) positioned at the periphery of the dial (4), said guide having a polished internal surface (21) oriented towards the dial (4) and an external surface (22) held in a space delimited by the dial (4), the crystal (8) and the inner wall (10) of the fitting ring (9), characterised in that all or part of said external surface (22) of the guide is arranged to allow a progressive increase along the guide (20, 30, 40, 50) of the quantity of light diffused by said external wall gradually as one moves away from one of the light sources (13, 33, 35, 43, 53).

REFERENCES:
patent: 4217625 (1980-08-01), Klein
patent: 4561042 (1985-12-01), Wehner et al.
patent: 4705407 (1987-11-01), Brien
patent: 4908739 (1990-03-01), Brien
patent: 5363294 (1994-11-01), Yamamoto et al.
patent: 5575549 (1996-11-01), Ishikawa et al.
patent: 5604716 (1997-02-01), Cheung
Patent Abstracts Of Japan, vol. 96, No. 1, Jan. 31, 1996 & JP 07 24 8385 (Citizen Watch Co., Ltd.) Sep. 26, 1995.
Patent Abstracts Of Japan, vol. 8, No. 117 (P-277), May 31, 1984 & JP 59 024284 A (Orient Tokei KK) Feb. 7, 1984.
Patent Abstracts Of Japan, vol. 16, No. 12 (P-1297), Jan. 13, 1992 & JP 03 231118 A (Nippondenso Co. Ltd.), Oct. 15, 1991.

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