Small-sized optical memory device and information processing apparatus utilizing cylindrically shaped information recording medium
US5109374A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 13, 1989 |
| Grant date | Apr 28, 1992 |
| Priority date | — |
| Expiry date | Sep 13, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/24003
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical memory device includes a cylindrically-shaped optical information recording medium and at least one optical head disposed around the information recording medium for irradiating the information recording medium with a light spot for recording or reproduction of information. The optical head has light spot moving means incorporated therein for the irradiation position of the light spot. The recording or reproduction of information is achieved by causing the light spot moving means to perform tracking control so that the light spot follows a desired track in an area within a range of movement of the light spot by the light spot moving means (or an infromation recording zone) in a state in which the relative positional relationship between the optical head and the cylindrically-shaped information recording medium in the direction parallel to the direction of the rotation axis of the information recording medium is fixed, with the optical head being not moved. The device can be constructed so that the position of either the optical head or the cylindrically-shaped information recording medium relative to the other in the direction parallel to the direction of the rotation ax…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.