Control of auto-tracking in tracking-error correcting system of video recording/reproducing apparatus
US4590523A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 4, 1982 |
| Grant date | May 20, 1986 |
| Priority date | — |
| Expiry date | Nov 4, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/592
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A tracking-error correcting system in a rotary head magnetic recording and reproducing apparatus in which reproducing magnetic heads are mounted on a respective bimorph leaf having piezoelectric elements so as to be movable in the direction of the axis of rotation. The piezoelectric elements are controlled by a control voltage which is produced by adding a signal from an auto-tracking circuit and a signal from a triangular wave generating circuit. In a reproducing mode at a tape speed which is different from a tape speed in recording mode, this system activates the auto-tracking circuit when the control voltage level is within a limited range which is detected by a control voltage detector. Also, this system stops the auto-tracking circuit during a transition period when the reproduction mode changes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.