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. 16, 2010
Filed:
Aug. 03, 2005
Ko Ishii, Tokorozawa, JP;
Ko Ishii, Tokorozawa, JP;
Pioneer Corporation, Tokyo, JP;
Abstract
A disc device () implements information processing with respect to, for example, a zeroth recording layer of an optical disk by an information processing section (), and outputs a double-layer main voltage value and a double-layer sub voltage value corresponding to the intensities of a zeroth-order light beam and ±first-order light beams which are received by a photodetecting element () to an offset calculating section () by a voltage value acquiring section (). The voltage value acquiring section () stores voltage values corresponding to the intensities of the zeroth-order light beam and ±first-order light beams which are received by the photodetecting element () as a single-layer main voltage value and a single-layer sub voltage value in a memory () in a state where a single-layer disc is loaded. The offset calculating section () calculates a voltage value corresponding to the intensity of a stray light beam that is reflected by a first recording layer not intended for information processing as an offset voltage value on the basis of the respective voltage values.