Optical read/write head for recording and playback of an optical disk and an optical device associated with said optical head
US4570249A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 1983 |
| Grant date | Feb 11, 1986 |
| Priority date | — |
| Expiry date | Feb 22, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/08
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical head is provided for writing and reading a disk by means of at least one focused beam, the disk being provided with at least one track having uniformly spaced grooves. The optical head makes use of a motor comprising a fixed magnetic circuit provided with at least one air-gap in which a moving system is capable of displacement and is also provided with an access and radial tracking magnetic circuit including at least one core which is secant with all the grooves. The moving system is constituted by two actuators, the first actuator being intended to permit access and radial tracking while the second actuator permits focusing of the light beam on the track, the two actuators being coupled by flexible attachment means. Guiding means comprising magnetic elements permit lifting of the access and radial tracking actuator with respect to the core of its magnetic circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.