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:
Oct. 16, 2001
Filed:
Nov. 13, 1998
Akira Mitani, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A recording/reproducing method and apparatus having the function of tracking a head on a data track formed on a recording medium of a lower-order specifications and on a data track formed on a recording medium of the upper-order specifications. During calibration, a controller,causes a locally maximum value and a locally minimum value of the signal level of a sine wave signal to be sequentially stored as the table information in a storage unit,as a magnetic head is moved by a head driving unit,in a direction perpendicular to the plural tracks. The sine wave signal is generated by an optical encoder and represents a substantially sinusoidal signal which completes its full cycle on the track basis. During tracking, the locally maximum value and the locally minimum value associated with a targeted track are read out from the storage unit,and a target sine wave level information is generated based on the generated locally maximum value and the locally minimum value. The magnetic head is tracked to the targeted track by a lower-order tracking controlling circuit,a based on the generated target sine wave level information.