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:
Nov. 29, 2016
Filed:
Dec. 20, 2012
Citizen Holdings Co., Ltd., Tokyo, JP;
Citizen Electronics Co., Ltd., Yamanashi, JP;
Takashi Akiyama, Saitama, JP;
Shigehisa Watanabe, Yamanashi, JP;
Hidekazu Arai, Yamanashi, JP;
Yuki Ochiai, Yamanashi, JP;
CITIZEN HOLDINGS CO., LTD., Tokyo, JP;
CITIZEN ELECTRONICS CO., LTD., Yamanashi, JP;
Abstract
The purpose of the present invention is to reduce the size and thickness of an LED module in which a plurality of LED dies along with other electronic components are mounted on a circuit board, and at the same time to stabilize the operation of the module with respect to source voltage fluctuation. The LED module includes: a circuit board; a plurality of LED dies that are mounted on one surface of a circuit board as bare chips and constitute a series circuit; an FET die that is mounted on the one surface of a circuit board as bare chips and controls a current flowing through the plurality of LED dies; and a constant current circuit that is mounted on the one surface of a circuit board and is series-connected to the series circuit. The constant current circuit includes the FET die.