Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1994-07-19
1995-09-19
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7813, 360 75, G11B 5596, G11B 2102
Patent
active
054521530
ABSTRACT:
A magnetic recording head positioning system includes a Terfenol-D magnetostrictive rod prestressed by a lever arm to operate in a linear range to microposition the magnetic recording head in accordance with an electromagnetic field. The mechanical advantage of the lever arm amplifies changes in the magnetostrictive rod to position the head. The varying electromagnetic field is applied to the rod by a coil in response to a position error signal produced from servo data tracks on the magnetic tape. A permanent magnet system biases the magnetostrictive element with a DC field so that varying the field provides bi-directional motion of the magnetic recording head. The DC field also reduces coil current and size requirements. The position signal is filtered so that changes in length of the magnetostrictive rod provide fast, fine positioning of the head while a stepper motor and lead screw subassembly system provide slow, coarse positioning of the magnetic recording head by moving the magnetostrictive element assembly in an open loop and/or closed or servo loop mode.
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Baheri Hamid
Campbell Peter
Griffith Daniel L.
Harman Jefferson H.
Kapadia Varsha
Psitos Aristotelis
Wangtek, Inc.
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