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:
Jan. 23, 2007
Filed:
Dec. 04, 2002
Hiroshi Take, Tokyo, JP;
Hiroyuki Arioka, Tokyo, JP;
Narutoshi Fukuzawa, Tokyo, JP;
Shuji Tsukamoto, Tokyo, JP;
Takashi Horai, Tokyo, JP;
Motohiro Inoue, Tokyo, JP;
Hiroshi Take, Tokyo, JP;
Hiroyuki Arioka, Tokyo, JP;
Narutoshi Fukuzawa, Tokyo, JP;
Shuji Tsukamoto, Tokyo, JP;
Takashi Horai, Tokyo, JP;
Motohiro Inoue, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
It is an object of the present invention to provide a multilevel optical recording medium in which influence of variation in characteristics of a recording layer in a plane of the recording layer on reproduced data can be corrected The multilevel optical recording medium according to the present invention includes at least a recording layerand is constituted so that data can be recorded therein in a multilevel manner by controlling a state of the recording layeramong multiple stages and the multilevel optical recording medium according to the present invention is characterized in that a plurality of calibration signals are stored in the recording layerAccording to the thus constituted multilevel optical recording medium, since an optical data recording and reproducing apparatus can detect and correct for the variation in characteristics of the recording layerin the plane thereof, even in the case where variation in characteristics of the recording layerin the plane thereof is present, data recorded in the multilevel optical recording medium in a multilevel manner can be read in a desired manner.