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. 12, 2000
Filed:
Mar. 20, 1998
Applicant:
Inventor:
Yasuaki Morimoto, Kawasaki, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369112 ; 369110 ; 369 4424 ;
Abstract
An optical information storage unit irradiates a light on a recording medium having a recording surface provided with a land and a groove and detects a reproduced signal from a light reflected from the recording medium. The optical information storage unit is provided with a phase compensation mechanism, provided in an optical path through which the light irradiated on the recording medium and a reflected light from the recording medium passes, for applying with respect to the reflected light a first phase compensation quantity required to detect a signal from the land and a second phase compensation quantity required to detect a signal from the groove.