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:
Jun. 24, 2003
Filed:
Jun. 04, 1999
Kayoko Taniguchi, Kanagawa, JP;
Sony Precision Technology Inc., Tokyo, JP;
Abstract
A disc recording and/or reproducing apparatus has a scale movable along with a magnetic head radially of a magnetic disc provided in the disc recording and/reproducing apparatus and which has recorded thereon readable by a laser light position information indicative of the radially moving position of the magnetic head. The position information indicates a smaller range than the radial length of a signal recording area on the magnetic disc. The writing of servo signals to the magnetic disc is done by a servo signal writing apparatus including an optical head disposed movably in a position corresponding to the moving position of the scale to detect the position information recorded on the scale, and a main controller to move the magnetic head radially of the magnetic disc for writing the servo signal to the magnetic disc and to move the optical head correspondingly to a position where the servo signal is to be written. The position where the position information is to be detected is changed by moving the optical head correspondingly to the position where the servo signal is to be written, thereby recording a servo signal to each of all the areas on the magnetic disc. Thus, the disc recording and/or reproducing apparatus and servo signal writing apparatus can implement a high accuracy, high resolution and a low cost in recording servo signals to a disc provided in the disc recording and/or reproducing apparatus.