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:
Jul. 19, 2010
Mitsutaka Iwasaki, Kanagawa, JP;
Mitsutaka Iwasaki, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A multi-beam laser light-intensity control circuit includes laser diodes; a light-receiving element for receiving a laser beam emitted from each laser diode and outputting a current corresponding to the light intensity of the received laser beam; and an automatic power control circuit for automatically controlling output power of each laser diode based on the current output from the light-receiving element. The automatic power control circuit includes a current/voltage conversion unit for converting the current output from the light-receiving element into a voltage; an error amplifying circuit for amplifying a difference voltage between the voltage output from the current/voltage conversion unit and a predetermined reference voltage; storing circuits each configured to store the difference voltage output from the error amplifying circuit in association with the corresponding laser diode; and drive current generating units each configured to generate a drive current for the corresponding laser diode based on the difference voltage.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile