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:
Feb. 16, 1988
Filed:
Oct. 21, 1985
Applicant:
Inventors:
Masahiro Takasago, Odawara, JP;
Osami Kushizaki, Hiratuka, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 46 ;
Abstract
An optical information recording and reproducing apparatus for irradiating a disk-shaped recording medium having spiral tracks with a light beam so that the information recorded along the tracks may be reproduced. The apparatus is equipped with a circuit for detecting the displacement of the light beam from said tracks and a clipping circuit for clipping a tracking error signal or the output signal of said detecting circuit with a predetermined threshold value. The light beam has its position corrected along the tracks in accordance with the output signal of said clipping circuit so that it may be prevented from tracking erratically.