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:
May. 23, 1989
Filed:
Feb. 24, 1987
Hubert Song, Sunnyvale, CA (US);
Konishiroku Photo Industries Co., Ltd., Tokyo, JP;
Abstract
A servo system for a removable disk having twice the servo information per disk track. The disk is encoded such that the servo sectors on one surface of the disk are angularly off-set and are located half-way between the servo sectors on the other side of the disk. Once a desired track is located, the disk rotates and the system switches between heads on the two surfaces of the disk to alternately read the servo sectors on both sides of the disk. A demodulator, peak detector, sample/hold device stores the servo information from the previous two servo sectors which were read to produce a position error signal which controls the linear motor to keep the heads on the desired track.