Fringing field focus motor and mechanism for optical disk drive
US6970401B2 · kind B2 · utility
1Cited by
3References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 4, 2001 |
| Grant date | Nov 29, 2005 |
| Priority date | — |
| Expiry date | Sep 4, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/0071
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system for controlling a distance between an optical head and the surface of a rotating optical disk comprising: an actuator arm having a first and second surface, the first surface facing the optical disk, the second surface facing away from the optical disk; an electromagnetic coil having an inner void, said coil adjacent to the second surface of the arm; and at least one permanent magnet producing a magnetic field that passes through the coil such that when an electric current is applied to the coil, a force is created at two or more segments of the coil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.