Method and apparatus for detecting a track count in an optical disk apparatus for recording/reproducing data on/from an optical disk
US5239530A · kind A · utility
Inventors
Key dates
| Filing date | Feb 27, 1990 |
| Grant date | Aug 24, 1993 |
| Priority date | — |
| Expiry date | Feb 27, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B27/19
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disk apparatus is used for an optical disk having a plurality of types of access marks repeatedly formed on the optical disk, each access mark being constituted by at least two pits. The apparatus comprises an optical head for optically reading a pattern represented by each of the access marks, a discrimination circuit for discriminating whether or not the pattern is correctly read out by the optical head, a storage for storing a pattern of access mark which is discriminated to be correct by the discrimination circuit until the discrimination circuit discriminates the next pattern of the access marks, and cross track count detector for comparing the pattern stored in the storage with the correct pattern discriminated by the discrimination circuit and for calculating the cross track count from these two patterns.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.