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. 24, 2012
Filed:
Sep. 28, 2007
SO Ishika, Yokohama, JP;
So Ishika, Yokohama, JP;
Toshiba Samsung Storage Technology Corporation, Kawasaki, JP;
Abstract
An optical disc device includes a laser diode which irradiates an optical disc having a plurality of layers with laser light, a photodetection section which detects laser light reflected by the optical disc, which comprising a pair of sub-photodetectors and a main photodetector provided between the pair of sub-photodetectors, a focus error signal generation circuit which generates a focus error signal from a photodetection signal output by the main photodetector, a tracking error generation circuit which generates a tracking error signal from the photodetection signal output by the main photodetector and a photodetection signal output by the pair of sub-photodetectors, and a layer determination signal processing circuit which generates a layer determination signal from the photodetection signal output by the pair of sub-photodetectors and determines in which of the layers a focus of the laser light is located, on the basis of the layer determination signal and focus error signal.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile