Actuator with moveable coil and recording apparatus

Details Actuator with moveable coil and recording apparatus Actuator with moveable coil and recording apparatus

1995-03-20

1996-12-03

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

360105, 360106, 310 13, G11B 554, H02K 4102

Patent

active

055814220

ABSTRACT:
A movable coil-type actuator including (a) a permanent magnet assembly constituted by a flat permanent magnet and a lower yoke element made of ferromagnetic material, the permanent magnet assembly including a recess in a central portion; (b) an upper yoke element made of a ferromagnetic material, the upper yoke element having such a shape that an edge of the permanent magnet does not extend from a periphery of the upper yoke element when viewed from above; (c) a unitary base member made of a thermoplastic resin and integrally including a hold portion for receiving the permanent magnet assembly and support portions for supporting the upper yoke element, a magnetic gap being defined by the permanent magnet and the upper yoke element; and (d) a movable coil fixed to an end of a swingable arm and movable in the magnetic gap.

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