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. 11, 1998
Filed:
Oct. 16, 1996
Applicant:
Inventor:
Tadashi Adachi, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 13 ; 369 54 ;
Abstract
A magneto-optical disc recording apparatus is constituted by a pre-output detection circuit, a post-output detecting circuit, a pre-output pulsing circuit, a post-output pulsing circuit, a logical operation circuit, a recording data memory circuit and a comparison operation circuit. An optical head is configured by arranging photodetectors in an array so that the light returned from the areas in the medium on which the laser beam is irradiated can be separately detected at two or more positions along the direction of advance of the laser beam.