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. 20, 2011
Filed:
Feb. 25, 2008
Osamu Ueno, Kanagawa, JP;
Akira Sakamoto, Kanagawa, JP;
Kazuhiro Sakai, Kanagawa, JP;
Hideo Nakayama, Kanagawa, JP;
Akemi Murakami, Kanagawa, JP;
Osamu Ueno, Kanagawa, JP;
Akira Sakamoto, Kanagawa, JP;
Kazuhiro Sakai, Kanagawa, JP;
Hideo Nakayama, Kanagawa, JP;
Akemi Murakami, Kanagawa, JP;
Fuji Xerox Co., Ltd., Tokyo, JP;
Abstract
Provided is a method for driving a surface emitting semiconductor laser including an active region that generates light, a resonator structure disposed such that it sandwiches the active region, and a driving electrode that provides power to the active region. The surface emitting semiconductor laser has an internal resistance defined by voltage and current applied to the driving electrode. The method includes applying a modulation signal to the driving electrode, in which the modulation signal has a current amplitude defined by a first current value and a second current value that is greater than the first current value. The modulation signal is in a negative gradient region in which the internal resistance decreases in contrast to the increase of the current.