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. 12, 2002
Filed:
Sep. 02, 1999
Tsukasa Maruyama, Tokyo, JP;
Dowa Mining Co., Ltd., Tokyo, JP;
Abstract
A photodetection device is provided wherein a condenser lens is arranged in front of a photodetection element . This photodetection device is of high photodetection angular efficiency with a constant photodetection e.m.f. over a prescribed region, of high photodetection angular efficiency and does not pick up optical interference. By forming condenser lens as a non-spherical lens that concentrates light onto a single point of convergence C without spherical aberration and moving the photodetection element further towards lens than the point of convergence C, it is arranged that light that has passed through condenser lens is received over the entire region of the photodetection surface of photodetection element and also that all of the light that is incident onto condenser lens inclined at a prescribed angle is received by the photodetection surface.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile