Information storage disk transducer position control system requiring no servo pattern on the storage disk
US4613916A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 30, 1983 |
| Grant date | Sep 23, 1986 |
| Priority date | — |
| Expiry date | Dec 30, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B21/085
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The radial position of a transducer used to read and/or write information into or write information into or from a spinning information storage disk (optical or magnetic) is servo controlled by an optical doppler interferometer mounted at least in part for common movement with the transducer. The optical doppler interferometer measures the instantaneous linear velocity of the information storage disk at the position of the transducer (or at a fixed relative position with respect to the transducer) and the position of the transducer is controlled so as to make the measured instantaneous linear velocity follow a reference signal corresponding with the desired information storage track.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.