Illumination – Illuminated scale or dial – Edge illuminated modifier or light rod/pipe
Patent
1989-09-25
1990-09-04
Lazarus, Ira S.
Illumination
Illuminated scale or dial
Edge illuminated modifier or light rod/pipe
362 31, 362 32, 362 85, F21V 800
Patent
active
049549308
ABSTRACT:
An illumination light guide includes a plurality of elongated illuminating portions; a light guiding path portion connecting one end of each of the illuminating portions; a light receiving portion formed in the light guiding path portion; a plurality of light distributing/reflecting portions formed in the light guiding path portion so as to correspond to the illuminating portions and having different lengths such that the longer a distance from the light receiving portion to one of the light distributing/reflecting portions, the longer a length of the one of the light distributing/reflecting portions; and a plurality of light reflecting portions formed at the other ends of the illuminating portions, respectively. With this structure, the light emitted from a single light source is received by the light receiving portion, and is uniformly distributed and reflected by the light distributing/reflecting portions and transmitted into the respective illuminating portions. Light transmitted through the illuminating portions is also reflected by the respective light reflecting portions, and is returned into the adjacent illuminating portions to ensure uniform illumination.
REFERENCES:
patent: 2480178 (1949-08-01), Zinberg
patent: 2498436 (1950-02-01), Legras
patent: 2671163 (1954-03-01), Minter
patent: 3043038 (1962-07-01), Marble
patent: 3223833 (1965-12-01), Protzmann
patent: 3699915 (1972-10-01), Greene
patent: 4124879 (1978-11-01), Schoemer
patent: 4389698 (1983-06-01), Cibie
patent: 4765701 (1988-08-01), Cheslak
Maegawa Mamoru
Sakamoto Fumio
Alps Electric Co. ,Ltd.
Cole Richard R.
Lazarus Ira S.
Shoup Guy W.
Winters Paul J.
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