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:
Aug. 21, 2001
Filed:
Dec. 10, 1997
Applicant:
Inventors:
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 3/90 ;
U.S. Cl.
CPC ...
G11B 3/90 ;
Abstract
An initializing apparatus includes a laser light source for emitting an erasing laser light for initializing an optical disk, a laser drive circuit for driving the laser light source according to an AC waveform signal, an optical system for irradiating the optical disk with the erasing laser light and track address detecting circuitry for detecting the track address. Furthermore, the laser light source, the laser drive circuit and the optical system are previously adjusted so that an amorphous portion having a size of ½ or less of a wavelength of the erasing laser light may be formed at the inside of a melting re-crystallization portion.