Texturing apparatus for magnetic recording medium and magnetic recording medium process thereby
US5981902A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 1995 |
| Grant date | Nov 9, 1999 |
| Priority date | — |
| Expiry date | Dec 14, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/82
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A texturing apparatus for applying a texturing to a magnetic recording medium, such as a magnetic disk including a hard drive. A substrate such as a magnetic disk is held by a substrate rotating system, which is capable of rotating the substrate. A movable laser beam source including an electro-optic modulation circuit directs a laser beam through a focusing element onto the surface of the substrate. The modulation circuit allows the laser beam to pulse at a frequency from 0.1 to 100 MHz. The focusing element allows a laser beam spot diameter of 0.2 to 4 .mu.m on the surface of the substrate. This texturing includes texturing the magnetic head contact start and stop (CSS) area of hard disks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.