Method and device for reading out optically recorded data and compensating for a drastic change in the position of a line to be read
US4855981A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 17, 1986 |
| Grant date | Aug 8, 1989 |
| Priority date | — |
| Expiry date | Apr 17, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B17/34
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Method and a device for reading out optically recorded data from an optical recording medium having data recording regions defined by reference lines in stripe and plural data tracks arranged in parallel to each other and perpendicular to said reference lines. According to the present inventions, a drastic change in the position of a reference line at a given order within the sensing field is monitored from among plural reference lines covered by the field. If there is any drastic change, the order of the reference line for reading is modified so that the data track to be read can be accurately followed even if the field of the reading sensor is deviated in the direction of the data tracks. It also enables correct data reading by checking whether the position of the reference lines included in the field of the reading sensor is within the preset tolerance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.