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:
Jul. 24, 2012
Filed:
May. 10, 2007
Takeyoshi Kataoka, Yokohama, JP;
Takeyoshi Kataoka, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi-LG Data Storage, Inc., Tokyo, JP;
Abstract
When record or reproduction quality of an optical disc is deteriorated, an enhancement in the performance is implemented by slowing down record or reproduction speed of the optical disc. However, there still exists a problem of how to select and determine a timing with which the speed is to be modified. In the present invention, the modification of the speed is performed with a seek processing selected and used as its trigger, and depending on various conditions at that time. Simultaneously, information recording area of the optical disc is separated into a plurality of zones. Then, when an optical pickup passes though a zone switching portion therebetween, the seek processing is inserted, thereby being used as the trigger for the speed modification.