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:
Jun. 20, 2006
Filed:
Feb. 08, 2002
Tomiji Tanaka, Miyagi, JP;
Shinichi Nakao, Kanagawa, JP;
Sohmei Endoh, Miyagi, JP;
Tamotsu Ishii, Chiba, JP;
Tomiji Tanaka, Miyagi, JP;
Shinichi Nakao, Kanagawa, JP;
Sohmei Endoh, Miyagi, JP;
Tamotsu Ishii, Chiba, JP;
Sony Corporation, Tokyo, JP;
Abstract
A device and a method for judging the radial moving direction of light spots formed on the signal recording surface of an optical disc having grooves of two types, which are different from each other in terms of depth and which are arranged along a recording track that is a land of the optical disc. The judging section of the device judges the moving direction of the main spot on the basis of binarized data of a difference signal of the main spot and binarized data of a difference signal of one of spots on the side. With this arrangement, the moving direction of the light spots relative to a radial direction of the optical disc can be determined only by using difference signals without using any sum signal.