Device for producing a line of illumination

Details Device for producing a line of illumination Device for producing a line of illumination

1981-10-15

1984-07-17

Walsh, Donald P.

Illumination

Revolving

362 32, 362293, 362294, 362300, F21V 704

Patent

active

044609396

ABSTRACT:
A device for providing a line of illumination in an optical reader, comprises an internally reflecting body having an elliptical reflecting surface joined to a part-cylindrical reflecting surface. A light source is disposed on one focal line of the elliptical surface, and a plate-like light guide has its light-receiving end disposed on the other focal line of the elliptical surface. One of the two focal lines of the elliptical surface is also the center of curvature of the part-cylindrical surface. The internal reflection and re-reflection of the light in the light guide ensures that the line of light emerging from the exit end of the light guide will be of uniform intensity throughout its length.

REFERENCES:
patent: 4110026 (1978-08-01), Farley
patent: 4241382 (1980-12-01), Daniel
patent: 4249231 (1981-02-01), Decaux
patent: 4333130 (1982-06-01), Mocnizuki

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