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:
Aug. 07, 2012
Filed:
Aug. 14, 2009
Yasuhiro Nihei, Kanagawa, JP;
Atsufumi Omori, Kanagawa, JP;
Dan Ozasa, Kanagawa, JP;
Jun Tanabe, Kanagawa, JP;
Masaaki Ishida, Kanagawa, JP;
Yasuhiro Nihei, Kanagawa, JP;
Atsufumi Omori, Kanagawa, JP;
Dan Ozasa, Kanagawa, JP;
Jun Tanabe, Kanagawa, JP;
Masaaki Ishida, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A light-source driving device includes a high-frequency clock generating circuit that generates high-frequency clock signals of which phases are different from each other; an image-data generating circuit that generates a plurality of pieces of image data corresponding to light emitting units in accordance with image information; a write control circuit that generates a plurality of pieces of modulation data corresponding to the light emitting units based on the image data and adjusts output timing of the modulation data individually in units of time corresponding to a phase difference of the high-frequency clock signals; and a light-source driving circuit that drives the light emitting units based on a plurality of pieces of PWM data output from the write control circuit.