Preformatted optical recording card and method of producing the same
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United States of America Patent
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Oct 31, 1989
Grant Date -
N/A
app pub date -
Jan 16, 1987
filing date -
Jan 21, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved art of producing an optical recording medium by utilizing a photo-etching technique is disclosed. Pits pattern of address for guide groove and sector on each of tracks of optical recording medium to be preformatted is formed in accordance with a photo-etching process or a resist lift-off process. A film of optical recording medium is formed on a transparent base plate and it is then subjected to photo-etching process or alternatively to resist lift-off process to form preformatted pits pattern.
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