Optical memory apparatus
US4607358A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 20, 1985 |
| Grant date | Aug 19, 1986 |
| Priority date | — |
| Expiry date | May 20, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B17/005
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an optical memory apparatus wherein predetermined information is optically recorded on a recording medium along guide grooves previously formed and then played back; an optical memory apparatus wherein, using a tracking signal and a signal indicating the quantity of reflected light at the time at which a projected light beam passes through the guide grooves, the directions in which the light beam passes through the grooves and the number of the guide grooves to be passed are detected, a seek control is performed by adding and subtracting the numbers of the guide grooves to be passed, depending upon the directions of passage, and fine positioning is thereafter performed by the use of the tracking signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.