logo

For the Inventor, By the Inventor

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.:

US 4866692 B1

PDFFull Text
Date of Patent:
Sep. 12, 1989

Filed:

Aug. 17, 1987

Method and apparatus for information recording and reproduction of a

Applicant:
Inventors:

Atsushi Saito, Ichikawa, JP;

Takeshi Maeda, Kokubunji, JP;

Hisataka Sugiyama, Kokubunji, JP;

Wasao Takasugi, Higashiyamato, JP;

Assignee:

Hitachi, Ltd., Tokyo, JP;

Attorney:

Antonelli, Terry & Wands

Primary Examiner:

Vincent P Canney

Assistant Examiner:

Kevin Fournier

Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 59 ; 369111 ; 369 50 ; 369 51 ; 369 47 ; 369 48 ; 369106 ; 369116 ; 369 54 ;
Abstract

A method and an apparatus for recording and reproducing information for use with an optical disk apparatus in which a pit edge recording method is used. According to the pit edge recording method, the leading edge and the trailing edge of a hole pit or a record domain generated during a recording operation are dealt with as information. During the recording, the recording pulse width and the recording power are corrected, and during the reproduction, the variation in the edge position is corrected.

Find Patent Forward Citations

Saito, Atsushi. (1989). Method and apparatus for information recording and reproduction of a (U.S. Patent No. 4866692). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4866692

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Loading…