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:
May. 31, 2016
Filed:
Jun. 27, 2012
Hisashi Tomiyama, Yamato, JP;
Masaharu Urano, Yokohama, JP;
Kazuaki Iseda, Saga, JP;
Shigemi Hagiwara, Hadano, JP;
Hisashi Tomiyama, Yamato, JP;
Masaharu Urano, Yokohama, JP;
Kazuaki Iseda, Saga, JP;
Shigemi Hagiwara, Hadano, JP;
RICOH COMPANY, LTD., Tokyo, JP;
Abstract
A lighting control circuit for an illuminating lamp includes: a rectifier part that is connected to a ballast to which commercial alternating-current electric power is supplied, and converts the alternating current to direct current; a smoothing capacitor that is provided on an output side of the rectifier part, and removes an alternating-current component included in direct current outputted from the output side; a drive circuit that has a switching element, and performs on-off control on electric current flowing to a plurality of solid-state light-emitting elements connected in series to both ends of the smoothing capacitor; and an inductor that is provided in an electric power supply system between the ballast and the smoothing capacitor.