For jumping a light spot on a track of a recording medium
US4541083A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 2, 1982 |
| Grant date | Sep 10, 1985 |
| Priority date | — |
| Expiry date | Dec 2, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/08505
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a light spot control signal generating device, a light spot is irradiated on a recording medium having tracks on which information is recorded. In order to jump the light spot from a track being scanned thereby to an adjacent track, a signal representative of light quantity of reflection or transmission of the light spot and a track error signal are detected. The two signals are used to judge whether the light spot has passed through an edge of the track. The track error signal is also used to detect a signal representative of an instant at which the light spot is present at the middle point between adjacent tracks, and this signal is used as a timing signal for changing the polarity of a control signal applied to a spot light deflector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.