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:
Mar. 27, 2007
Filed:
Feb. 20, 2004
Takashi Matsuda, Tokyo, JP;
Takashi Matsuda, Tokyo, JP;
Hiatchi-LG Data Storage, Inc., Tokyo, JP;
Abstract
In an optical disk apparatus, recording information by irradiating a laser light from a laser diode LD upon a recording surface thereof, while rotationally driving an optical disk by means of a spindle motor, being provided with a front monitor diode FMD for monitoring the laser light from the LD therein, a controller portiondetects deterioration of the laser diode, including the kink phenomenon, in particular, of loosing the linearity in the driving characteristic thereof caused due to driving under the condition of high temperature, by comparing a laser light output detected by the FMD to that, which is detected previously, within recording operation of the apparatus, and it also makes controls to lower the rotation velocity of the optical disk. This is suitable, in particular, to the optical disk apparatus of a super or ultra-thin type.