Method and apparatus for providing a resume function for a disc player
US6430120B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 26, 1999 |
| Grant date | Aug 6, 2002 |
| Priority date | — |
| Expiry date | Jan 26, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/5552
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A compact disc player includes an optical pickup supported by a carriage and a microprocessor for controlling the movement of a coarse actuator and a fine actuator. The coarse actuator controls the movement of the carriage and maintains its position when power is interrupted to the coarse actuator. The fine actuator is disposed between the carriage and the pickup and provides fine movement for the pickup when power is supplied to the actuator. The fine actuator moves the pickup to a neutral position when power is interrupted. A resume function is provided that restores the position of the pickup after a power interruption to its position before the interruption. A value indicative of the position of the pickup relative to the carriage is stored in memory. When power is restored to the disc player, the value is read from memory. The disc control microprocessor directs incremental movements of the fine actuator until the position of the pickup corresponds to the position represented by the stored value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.