Substrate for a magnetic recording medium having laser beam absorption characteristic and a magnetic recording medium using the substrate
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United States of America Patent
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-
Nov 2, 1999
Issued Date -
N/A
app pub date -
Jul 29, 1997
filing date -
Jul 31, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A substrate for a magnetic recording medium. The substrate is a non-magnetic brittle material having a substantially flat surface on which laser marks having a height in a range of 10-500 .ANG. are formed in a landing zone. The laser marks are formed by irradiating a pulsed laser beam having a wavelength capable of being absorbed in the non-magnetic brittle material within a range of substantially circular form having a waist diameter D .mu.m, and which has a physical property of 0.5
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