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. 25, 2006
Filed:
Oct. 14, 2003
Masayasu Ito, Shizuoka-ken, JP;
Hiroki Ishibashi, Shizuoka-ken, JP;
Kentaro Murakami, Shizuoka-ken, JP;
Hitoshi Takeda, Shizuoka-ken, JP;
Masayasu Ito, Shizuoka-ken, JP;
Hiroki Ishibashi, Shizuoka-ken, JP;
Kentaro Murakami, Shizuoka-ken, JP;
Hitoshi Takeda, Shizuoka-ken, JP;
Koito Manufacturing Co., Ltd., Tokyo, JP;
Abstract
A lighting circuit for lighting a vehicular lamp including a plurality of light-emitting diodes, includes: a selection unit for selecting the number of light-emitting diodes to be connected in series in the vehicular lamp based on an instruction from the outside; a switching regulator for applying an output voltage based on a power-supply voltage output by an external DC power supply to the selected number of light-emitting diodes to be connected in series, so as to supply a supply current to the selected number of light-emitting diodes; and an output controlling unit for controlling the output voltage of the switching regulator based on the supply current.