Position sensor, optical head device, head moving mechanism, information recording and reproduction device and position control system
US8299782B2 · kind B2 · utility
4Cited by
10References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 18, 2006 |
| Grant date | Oct 30, 2012 |
| Priority date | — |
| Expiry date | Oct 14, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0013
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
As imaging devices are miniaturized, and optical devices are miniaturized, lens moving mechanisms are also miniaturized. Thus, position sensors for them are required to be miniaturized and have high accuracy at low cost. A magnet of a pillar shape and a yoke which move in the X axis direction with respect to a magnetic field detection element are provided, and a shape of a cross section of the yoke which is orthogonal to a longitudinal direction of the magnet changes along the longitudinal direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.