High-speed search method for use in a disc player system
US4926405A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 6, 1988 |
| Grant date | May 15, 1990 |
| Priority date | — |
| Expiry date | Sep 6, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A high-speed search method for searching a target address and for use in a disc player system having a slider for positioning a pickup for reading an information signal recorded on a disc as tracks, in a disc radius, and a tracking servo system for causing an information detecting point of the pickup to follow the track. An accelerating-and-decelerating move control mode in which the slider is accelerated and subsequently decelerated with the tracking servo loop open, and a constant speed move control mode in which the slider is moved at a constant speed by using address data obtained from a signal from the pickup are prepared, and a distance from a present position of the pickup to the target address is detected. Operations of the accelerating-and-decelerating move control mode and subsequently the constant speed move control mode are executed and the tracking servo loop is closed when the distance is equal to or greater than a predetermined value, whereas the operation of the constant speed move control mode is executed without executing the operation of the accelerating-and-decelerating move control mode and the tracking servo loop is closed when the distance is smaller than the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.