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:
Dec. 07, 2021
Filed:
Jul. 16, 2019
Applicant:
Koito Manufacturing Co., Ltd., Tokyo, JP;
Inventors:
Tomoyuki Ichikawa, Shizuoka, JP;
Masato Harazaki, Shizuoka, JP;
Assignee:
KOITO MANUFACIURING CO., LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B 45/18 (2020.01); B60Q 1/30 (2006.01);
U.S. Cl.
CPC ...
H05B 45/18 (2020.01); B60Q 1/30 (2013.01);
Abstract
This lighting circuit comprises a current source and a thermal sensing element. The thermal sensing element senses the temperature of a semiconductor light source. The current source generates a drive current that shows a positive correlation with the temperature when the temperature is in a normal range and that shows a negative correlation with the temperature when the temperature falls within a temperature range higher than the normal range.