Data disc optical reader containing a device for automatic data access
US4106058A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 19, 1977 |
| Grant date | Aug 8, 1978 |
| Priority date | — |
| Expiry date | Apr 19, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B27/3054
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention concerns the reading by optical means of data recorded along a track on a disc; an address code, which increases one unit at each step, is recorded on the disc at the same time as the data. The optical reader contains a device for the fast movement of the reading head in a direction radial to the disc, a device for counting the number of track grooves thus crossed, a device for automatic access to some given data which contains a device for detecting addresses recorded and a programmed control circuit which triggers fast movement or a step by step movement of the reading head depending on whether the reading head is far from the track groove whose address has been recorded or is near to this track groove.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.