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. 16, 2016
Filed:
Jan. 25, 2011
Katsuaki Nakano, Isehara, JP;
Masateru Hayashi, Isehara, JP;
Katsuaki Nakano, Isehara, JP;
Masateru Hayashi, Isehara, JP;
ICHIKOH INDUSTRIES, LTD., Isehara-Shi, JP;
Abstract
In a conventional driving circuit, it has been inefficient and difficult to measure, classify, and rank (Vf) characteristics of a light emitting element that is in a bare-chip state. According to the present invention, a semiconductor-type light source is made of four light emitting chips (to) that are in a bare-chip state, the light emitting chips being randomly mounted on a board () without classifying (Vf) characteristics in advance. As the resistors, opening resistors (R, R, R) and trimming resistors (R, R, R) are disposed in parallel and then are connected in series to the four light emitting chips. Values of the resistors are adjusted so that a predetermined set current value or luminous flux value is reliably obtained with respect to the four light emitting chips. As a result, the present invention is capable of efficiently and easily mounting the four light emitting elements (to) and the resistors (Rto R) on the board ().
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile