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:
Nov. 08, 2011
Filed:
Feb. 19, 2007
Hideki Kondo, Yokohama, JP;
Naoki Mori, Yokohama, JP;
Hideki Kondo, Yokohama, JP;
Naoki Mori, Yokohama, JP;
Nichia Corporation, Anan-shi, JP;
Abstract
To provide an optical disc device, and similar, equipped with a new mechanism to reduce laser light noise due to optical feedback. In an optical disc devicein which a laser diode is driven by a high frequency modulation method, optical feedback is returned to the laser diode at a timing at which the phase of the injected carrier density is within one of the following ranges: (1) equal to or greater than the peak phase of the injected carrier density of the laser diode, and equal to or less than the peak phase of the injected carrier density of the laser diode plus 3π/8 (radians); or (2) equal to or greater than the peak phase of the injected carrier density of the laser diode plus 9π/8 (radians), and equal to or less than the peak phase of the injected carrier density of the laser diode plus 2π (radians).