Optical disk unit having reduced recording and reproducing errors
US5875155A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 23, 1997 |
| Grant date | Feb 23, 1999 |
| Priority date | — |
| Expiry date | Jan 23, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10595
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disk presents unit an object lens from being affected by an external disturbance caused by a reversed moving direction of an optical head when information is recorded or reproduced to or from an optical disk. The last moving direction of an optical head which has arrived at a target position of an optical disk is detected and, if it is opposite to a moving direction of the optical head for recording or reproducing information, the moving direction is inverted to the recording/reproducing moving direction before the optical head starts recording or reproducing information. At the time when the optical head inverts the moving direction, recording or reproduction of the information is not started. Therefore, no vibration or shock is applied to an object lens at the beginning of a recording or reproducing operation which might cause errors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.