Single stage tracking actuator apparatus for optical beam information storage drive system
US5023861A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1988 |
| Grant date | Jun 11, 1991 |
| Priority date | — |
| Expiry date | Dec 20, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/08582
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Single stage tracking actuator apparatus for an optical or magneto-optical disk drive system in which a read/write head is suspended by parallel flexures between mutually isolated magnetic circuits disposed on opposite sides of the head, one of the magnetic circuits being nested in the span between the parallel flexures. The flexure suspension provides friction-free translatable motion of the head in the longitudinal direction parallel to a radial line relative to the information storage disk. An electromagnetic coil provided with tracking actuator signals is formed about the head axially concentric with and transverse to the longitudinal center line of the head and is centrally positioned on the head between the points at which the free ends of the flexures are attached to the ends of the head. The end turn segments of the coil are disposed transversely of magnetic flux lines in elongated air gaps formed in the magnetic circuits to provide the driving force for the actuator. The friction-free suspension permits the actuator to perform both the track seek and the tracking modes of operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.