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:
Feb. 20, 1979
Filed:
May. 17, 1977
Yukio Mizohata, Kawagoe, JP;
Noribumi Tachihara, Tokyo, JP;
Copal Company Limited, Tokyo, JP;
Abstract
A light diffusing device for obtaining a surface uniform in the brightness by using a luminous flux narrow in the radiating angle comprising a flat smooth transparent base plate having a favorable transparency and including a luminous flux incident area defined on one side surface, a conical concavity formed on the other side surface opposed to said one side surface, aligned with the luminous flux incident area and having a bottom area at least equal to said area and light diffusing reflecting means provided on all the side surfaces except the above mentioned other side surface. Said luminous flux incident area is used as a connecting part with the end portion of a light guide or a containing section for a light source. The above mentioned other side surface serves as a displaying surface for such display medium as of words or signs or as a luminous surface for introducing lights of a uniform brightness into a plurality of light guides.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile