Texturing apparatus for magnetic recording medium and magnetic recording medium process thereby
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United States of America Patent
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Nov 9, 1999
Grant Date -
N/A
app pub date -
Dec 14, 1995
filing date -
Dec 15, 1994
priority date (Note) -
Expired
status (Latency Note)
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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.
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