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:
Jan. 25, 2022
Filed:
Apr. 20, 2020
Champ Tech Optical (Foshan) Corporation, Foshan, CN;
Chin-Che Hung, Tu-Cheng, TW;
Chun-Chi Chen, New Taipei, TW;
Jian-Hong Hu, Foshan, CN;
Wei Yuan, Foshan, CN;
Ai-Hua Li, Foshan, CN;
CHAMP TECH OPTICAL (FOSHAN) CORPORATION, Foshan, CN;
Abstract
A lighting device which is controllable in respect of color temperature as well as brightness has a control circuit electrically coupled to AC voltage source. The control circuit includes first and second control circuits, the first control circuit turns the light emitting device on and off and adjusts brightness of the light emitting device. The second control circuit determines whether the AC voltage source is on during a predetermined period, and if determined to be on, adjusts color temperature of the light emitting device.