Magnetic disk with a porous substrate
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United States of America Patent
Stats
-
May 3, 1988
Grant Date -
N/A
app pub date -
Jul 28, 1986
filing date -
Aug 21, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A magnetic recording disk having a rigid substrate disc is provided with an annular air gap defined between inner and outer peripheral bonding rings. A flexible disc sheet having a recording surface is placed over the arrangement and held tight against the peripheral bonding rings while the inner and outer edges of the flexible disc sheet are bonded to the bonding rings. In order to avoid deformation of the recording surface due to thermal expansion of the air trapped in the gap, the substrate is made porous to provide air passages between the air gap and the external atmosphere.
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