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:
Sep. 21, 2010
Filed:
Jun. 30, 2005
Eiji Muramatsu, Saitama, JP;
Kunihiko Horikawa, Saitama, JP;
Kazuo Kuroda, Saitama, JP;
Pioneer Corporation, Tokyo, JP;
Abstract
An information recording medium () is provided with: a first recording layer (L0 layer) having a first calibration area (-) in which test information for calibrating a power of laser light in recording record information can be recorded; and a second recording layer (L1 layer) having a second calibration area (-) in which the test information can be recorded and in which at least one portion of a recording area faces the first calibration area, wherein the first calibration area and the second calibration area including a space area (U-U-) having a predetermined size in positions facing each other, the test information is recorded in a recording area (R-) located on one side, centered on the space area, in the first calibration area, and the test information is recorded in a recording area (R-) located on other side which is opposite to the one side, centered on the space area, in the second calibration area.