Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1977-10-28
1979-04-17
Wolff, John H.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
G11B 2102
Patent
active
041504070
ABSTRACT:
An electrically controllable carrying arm arrangement for a magnetic disc store and comprising a carrying arm which at one of its ends carries a number of magnetic heads and at its other end is provided with a drive coil with the aid of which the carrying arm is pivoted, so that the magnetic heads are moved over the surface of a storage disc. The drive coil has a flat shape and a small thickness and moves in an air gap between two flat axially magnetized permanent magnets which belong to a stator of the arrangement. Preferably, the drive coil and the carrying arm are disposed in one plane which is perpendicular to the pivoting axis of the carrying arm, so that a compact unit is obtained which demands little mounting height. When a multiple carrying arm arrangement is desired, a plurality of carrying arms of the type described hereinbefore are stacked onto each other with intermediate spacings, while the stator construction is also obtained by stacking a plurality of stators. However, when n individual carrying arms are used and thus n separate stators, it suffices to use n+1 permanent magnets so that each magnet which is disposed between two drive coils cooperates with both drive coils.
REFERENCES:
patent: 4019205 (1977-04-01), Salmond et al.
IBM Technical Disclosure Bulletin, vol. 19, No. 4, Sep. 76, p. 1440, "Actuator Refraction Device", by Hearn.
IBM Technical Disclosure Bulletin, vol. 17, No. 10, Mar. 75, pp. 3016-3018, "Desk File Actuator", by Lissner et al.
Patent Associated Literature--IBM Journal of Research Development, vol. 20, No. 4, pp. 389-397, Jul. 1976, "Design of a Swinging Arm Actuator", by Heath.
Briody Thomas A.
Cohen Simon L.
Streeter William J.
U.S. Philips Corporation
Wolff John H.
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