Structure to provide optical and capacitive contrast on magnetic recording disk
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United States of America Patent
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Apr 12, 1988
Grant Date -
N/A
app pub date -
May 5, 1986
filing date -
May 5, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A magnetic recording disk is formed on a rigid aluminum substrate coated with a polymeric dielectric layer. A thin film metallic position-indicating track is applied to the upper surface of the dielectric layer. The dielectric material is coated with a magnetic recording medium. A thin film of aluminum forms the patterned capacitive and optically reflective track. The dielectric layer is composed of a very similar material to the matrix material in the magnetic recording medium. The disk can be flexible or floppy and it is not necessary to have the extra dielectric layer in such a case, where the substrate is a dielectric.
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