The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 17, 1984
Filed:
Oct. 15, 1981
Takashi Murakami, Saitama, JP;
Takeshi Higuchi, Saitama, JP;
Fuji Photo Optical Co., Ltd., Saitama, JP;
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.