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. 05, 2006
Filed:
Sep. 11, 2002
Syuji Tsukamoto, Tokyo, JP;
Hiroyuki Arioka, Tokyo, JP;
Narutoshi Fukuzawa, Tokyo, JP;
Takashi Horai, Tokyo, JP;
Hiroshi Take, Tokyo, JP;
Motohiro Inoue, Tokyo, JP;
Syuji Tsukamoto, Tokyo, JP;
Hiroyuki Arioka, Tokyo, JP;
Narutoshi Fukuzawa, Tokyo, JP;
Takashi Horai, Tokyo, JP;
Hiroshi Take, Tokyo, JP;
Motohiro Inoue, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A reproduction method for a multi-level optical recording medium according to the present invention rotates an optical recording medium, on which recording data has been recorded according to a multi-level recording method which sets several levels for light reflectivity of virtual recording cells, emits a reproduction laser beam towards the optical recording medium, and reproduces the recording data based on an electric signal generated in accordance with a received level of reflected light, the method setting the emission power of the reproduction laser beam in a range of 1.0 mW to 2.5 mW inclusive when the optical recording medium is rotated at a linear velocity in a range of 9 m/s to 25 m/s inclusive. By doing so, it is possible to improve the read accuracy for recording data while suppressing the reproduction deterioration of the optical recording medium to a level where deterioration effectively does not occur.