Magnetic field generating device
US5293360A · kind A · utility
9Cited by
6References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 8, 1992 |
| Grant date | Mar 8, 1994 |
| Priority date | — |
| Expiry date | Jun 8, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/1058
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is disclosed a magnetic field generating device for use in a magnetooptical recording apparatus of a magnetic field modulation method. The device includes a planar spiral coil, of which coil pitch is smaller in the peripheral area than that in the central area thereof, thus realizing a relatively wide area of magnetic field of uniform intensity, with a low inductance. Because of the planar structure, the device can be positioned very close to the recording medium, and can achieve the high speed switching required in the magnetic field modulation method, without a large power source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.