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:
Apr. 27, 2021
Filed:
Dec. 06, 2017
Applicant:
Koito Manufacturing Co., Ltd., Tokyo, JP;
Inventors:
Satoshi Kikuchi, Shizuoka, JP;
Takao Muramatsu, Shizuoka, JP;
Assignee:
KOITO MANUFACTURING CO., LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B 45/10 (2020.01); H05B 33/08 (2020.01); H05B 45/37 (2020.01); H05B 45/48 (2020.01);
U.S. Cl.
CPC ...
H05B 45/10 (2020.01); H05B 33/08 (2013.01); H05B 45/37 (2020.01); H05B 45/48 (2020.01);
Abstract
A lighting circuit controls lighting/extinguishing of a light source. A driving circuit generates a driving current which is to be supplied to the light source. A clamp circuit clamps a voltage between both ends of the light source to a clamp level in a period in which the light source is to be turned off. The clamp level is defined to be higher than zero and lower than a critical pressure when the light source is turned on/off.