Hard disc drive and a servo signal writing apparatus
US5325349A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 26, 1992 |
| Grant date | Jun 28, 1994 |
| Priority date | — |
| Expiry date | May 26, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59633
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A hard disc drive is comprised of a casing, a head arm located in the casing and movable in unison with a head, and a diffraction grating mounted on the head arm so as to diffract a light introduced into the casing from the outside of the casing, in which a light diffracted by the diffraction grating is introduced to the outside of the casing. Also, this hard disc drive further comprises an optical system provided outside the casing for receiving the diffracted light, the optical system detecting the arm position, a controller for controlling the arm position, and a servo signal writer for writing a servo signal on the disc on the basis of a detected signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.