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. 09, 1988
Filed:
Oct. 14, 1986
Alex Moraru, Fremont, CA (US);
Kechen Cheng, Sunnyvale, CA (US);
Konishiroku Photo Industries Co., Ltd., Tokyo, JP;
Abstract
A servo system intermittently samples servo sectors from a data disk to obtain the position of the read/write head and to maintain an on-track alignment. A glass scale measures the movement of the transducer head and provides a velocity signal. An integrator integrates the velocity signal to produce a fill-in position signal. This fill-in position signal is added to the position signal from the last sampled servo sector to provide a position compensator with position information when the head is in between servo sectors. An on-track detector circuit and a damping circuit heavily damp movement of the transducer head when the head is in the on-track position. A gain circuit modifies the signal going to the position compensator in order to compensate for misclamping and imperfections in the data disk. The position compensator includes a tilt circuit which compensates for tilting of the disk drive from a non-horizontal position.