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:
Apr. 02, 2013
Filed:
Jun. 25, 2009
Kazuo Takahashi, Hanno, JP;
Kazuo Takahashi, Hanno, JP;
Pioneer Corporation, Kanagawa, JP;
Abstract
A guide-layer separated optical recording medium includes a guide layer with a guide track formed therein and a plurality of recording layers, these layers being separately deposited from each other. A layer position information region for indicating position information of each of the recording layers, is formed on the guide track within a different range of the guide layer for each of the recording layers. Each of the recording layers includes a preformat region having a predetermined signal written on a record track along the guide track, and the preformat region on each of the recording layers is provided in a region corresponding to the layer position information region. An optical recording medium drive apparatus and a recording layer access method for the guide-layer separated optical recording medium are also provided. The apparatus and method implement: determining whether a reproduced signal has been obtained, based on the detection level of a reflected beam from the preformat region by a read/write optical system; acquiring position information of one of the plurality of recording layers based on the detection level of a reflected beam from a layer position information region by a servo optical system; and causing a second laser beam to access a desired one of the plurality of recording layers in accordance with the determination result of the reproduced signal and the position information.