High density magnetic recording apparatus including a hologram type magnetic head positioning system
US6128155A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1998 |
| Grant date | Oct 3, 2000 |
| Priority date | — |
| Expiry date | Jul 6, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/6088
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording apparatus including a magnetic head portion 9, a light emitting portion 10b emitting a light beam, a hologram portion 10a, a light receiving portion 10c, a carriage 12 and a control portion 16 for positioning the magnetic head portion 9 to a predetermined position. The hologram portion 10a is in a plate-like shape and has on one major surface a first gold reflection surface 10a3 formed on a first thing film layer 10a1 and on the other major surface a second gold reflection surface 10a4 formed on a second thin film layer 10a2. The hologram portion 10a also includes a light path 10a5 that guides the light beam in a zig-zag manner between the first and the second reflection surfaces 10a3 and 10a4 and optical components 10a8, 10a9, 10a10 for converting the light emitted from the light emitting portion 10b into a positioning light beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.