Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1986-08-21
1989-03-28
Faber, Alan
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7811, G11B 5596
Patent
active
048169390
ABSTRACT:
Magnetic recording media, and magnetic recording systems using such media, are disclosed which incorporate a light-transmitting optical grating at least substantially coextensive with the magnetic recording area. A second light-transmitting optical grating is associated with the magnetic transducer or read/write head. A moire pattern is produced by light transmitted through both optical gratings, and changes in the moire pattern resulting from changes in the alignment of the optical gratings resulting from movement of the read/write head relative to the media are utilized to provide servo information to keep the magnetic transducer aligned with the magnetic track.
Higher magnetic recording capacities may be obtained using such media and systems, since none of the magnetic recording area is used for servo information.
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Ford Vernon E.
Jones Jeremy K.
Mader John J.
Plummer William T.
Faber Alan
Mervis Stanley H.
Polaroid Corporation
Robertson David L.
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