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:
Oct. 11, 2005
Filed:
Aug. 13, 2002
Takashi Hoshino, Yokohama, JP;
Toshimitsu Kaku, Ibaraki, JP;
Akihiro Asada, Yokohama, JP;
Takehiko Sekine, Yokohama, JP;
Takashi Hoshino, Yokohama, JP;
Toshimitsu Kaku, Ibaraki, JP;
Akihiro Asada, Yokohama, JP;
Takehiko Sekine, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A laser waveform generation function is provided in a laser driving waveform generatornear a laser. A recording clock generatoris included in the laser driving waveform generatorto generate a clock with a frequency higher than that of a synchronizing clock. This allows a recording laser current (waveform) to be generated without transmission of a high frequency signal from the modulatorFurther, because the synchronizing clockis stopped upon a reproduction operation including reproduction operation in an ID unit, undesired effects on a reproduction operation such as ID reproduction can be reduced. Because the response speed of the recording clock generatorcan be changed, a high precision clock can be generated. Thus, a high-precision recording laser current (waveform) can be generated.