Low-mass short-stroke voice-coil actuator for integrated disk fi

Details Low-mass short-stroke voice-coil actuator for integrated disk fi Low-mass short-stroke voice-coil actuator for integrated disk fi

1976-04-02

1977-11-15

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Drum record

1791155VC, 360105, G11B 2122, G11B 2108, G11B 555, H04R 906

Patent

active

040588440

ABSTRACT:
A low-mass low-inductance short-stroke voice-coil actuator used with a positionable transducer and magnetic disk to provide fast memory access in a low cost-per-bit disk file memory system. Enclosed in a sealed disk module, the actuator and transducing system provide access to any disk information track within one disk revolution or less. Integral with said actuator is a total moving mass of less than 50 grams. A short voice-coil, of one inch or less, is always contained within the magnetic flux of the air gap; and the voice-coil, when energized, can provide a full stroke access (across said magnetic disk) within 16 milliseconds. A pair of spider flexures support (for longitudinal movement) a central rod, which is part of a differential velocity transducer and which is integral with the voice-coil. The central rod is also capable of being rotated by a solenoid to turn a cam which will "unload" or remove the transducing heads away from the disk surfaces.

REFERENCES:
patent: 2059209 (1936-11-01), Cutting
patent: 3748407 (1973-07-01), Prieur et al.
patent: 3751603 (1973-08-01), Prieur et al.
patent: 3979566 (1976-09-01), Willy
Loudspeakers, Jordan, Focal Press, 1963, pp. 58-59.

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