Track kick device in a disc recording and reproducing apparatus
US5640376A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 22, 1995 |
| Grant date | Jun 17, 1997 |
| Priority date | — |
| Expiry date | Dec 22, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0946
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A track kick device for a disc recording and reproducing device includes a direction determination device 1 outputting a forward pulse FWD or a backward pulse BWD according to a relation in phase between a pit position signal HFD and a tracking error signal TER, a track counter 2 counting the pulse FWD to increase its count value, the pulse BWD to decrease it, and a phase comparator 4, and a reference pulse generator 3 outputting a reference pulse for determining a speed of movement for the pickup. In the case of a track count mode, the phase comparator 4 outputs an acceleration pulse KP+ or a deceleration pulse KP- so that the tracking error signal TER is synchronous with the reference pulse, and in the case where a brake mode is effected in which the count value represents the aimed track, the phase comparator 4 outputs a brake pulse so that those signals HFD and TER indicates the on-track state of the pickup.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.