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:
Sep. 17, 2013
Filed:
Mar. 28, 2011
Tadaaki Oyama, Kanagawa, JP;
Tadaaki Oyama, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A light source driving device for driving plural light sources is provided. The light source driving device includes a voltage booster to boost a voltage from a power source to supply the boosted voltage to each of the plural light sources; a constant current driver to regularly hold driving current of each of the plural light sources constant; a load to consume substantially the same power as the plural light sources; and a switch to selectively connect either the load or the plural light sources with the voltage booster and the constant current driver so that the load or the plural light sources are interposed between the voltage booster and the constant current driver.