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. 30, 2013
Filed:
Jul. 15, 2010
Yoshio Sasaki, Tokorozawa, JP;
Yasushi Oshima, Adachi, JP;
Yoshio Sasaki, Tokorozawa, JP;
Yasushi Oshima, Adachi, JP;
Pioneer Digital Design and Manufacturing Corporation, Kanagawa, JP;
Abstract
An information recording/reproducing method includes: setting light beam power from a light source, to second power P, which is weaker than first power P, and detecting the number of the recording layers provided for an optical disc; controlling an objective lens to focus the light beam on one recording layer which is the closest to the objective lens, in a condition that the detected number of the recording layers ≧3; setting the power of the light beam to third power Pbetween Pand P; specifying the number of the recording layers provided for the optical disc on the basis of layer information, which is information associated with the one recording layer; and setting the power of the light beam to Preading the layer type information recorded in advance in the one recording layer, and specifying a disc type based on the read layer type information.