Magnetic recording apparatus having a reduced thickness
US6055122A · kind A · utility
3Cited by
3References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1998 |
| Grant date | Apr 25, 2000 |
| Priority date | — |
| Expiry date | Apr 24, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59677
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A holographic unit for applying light to a recording medium comprises an optical path, a first optical diffracting member, a second optical diffracting member, an optical condensing member, a first entrance/exit surface disposed at a predetermined first angle to a first reflecting surface, and a second entrance/exit surface disposed at a predetermined second angle to a second reflecting surface to project a plurality of light beams so that the plurality of light beams fall on a position sensing track formed on a recording medium perpendicularly to the surface of the recording medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.