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:
Oct. 02, 2007
Filed:
Aug. 29, 2002
Morihiro Murata, Hamamatsu, JP;
Akio Hirai, Hamamatsu, JP;
Morihiro Murata, Hamamatsu, JP;
Akio Hirai, Hamamatsu, JP;
Yamaha Corporation, Hamamatsu-shi, JP;
Abstract
An optical disk is compatible with one type of a recording apparatus which is designed to irradiate an optical beam onto the optical disk to form pits along the pregroove for actual recording of information. The optical disk is incompatible with another type of a recording apparatus which is designed to successively record the times of the test recording into a count area of the conventional optical disk. The optical disk has a test area corresponding to the test area of the conventional optical disk and a prepit area corresponding to the count area of the conventional optical disk, the prepit area being provisionally formed with prepits at least in a section corresponding to the predetermined section of the count area of the conventional optical disk so as to inhibit the other type of recording apparatus from conducting the test recording.