Optical head having object lens and patterned coil
US6757221B1 · kind B1 · utility
2Cited by
7References
36Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 26, 2000 |
| Grant date | Jun 29, 2004 |
| Priority date | — |
| Expiry date | Sep 6, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/1058
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical head includes a lens carrier movable at least radially of a magneto-optical disk in facing relation thereto. An object lens is mounted on the lens carrier to converge a laser beam for forming a laser spot on the disk. The object lens has an optical axis and includes a lens surface directed toward the disk. A patterned coil is formed on the lens surface at least in one layer and has a light-passing opening corresponding to the optical axis of the object lens. A light-pervious layer is formed on the lens surface for closing the light-passing opening of the coil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.