Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1994-06-29
1996-02-27
Levy, Stuart S.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
360104, G11B 554
Patent
active
054953766
ABSTRACT:
A latch mechanism, especially for use in a disk drive, includes a locking arm that rotates about a pivot and engages a slot on the moving member that is to be locked, such as a head-arm. In a fixed coil embodiment, a permanent magnet is attached to an inboard end of the locking arm within the windings of a coil. Ferrous elements are mounted between the coil and the pivot of the locking arm. The ferrous elements attract the permanent magnet to hold the locking arm securely in either a latching or an unlatching state. When the coil is energized, poles are induced in the ferrous elements such that one repels the permanent magnet away from its then current state into the opposite state, while the other ferrous element attracts the permanent magnet to the other state. The magnetic field of the coil simultaneously applies a pure torque to the locking arm. This torque rotates the locking arm so that the arm changes to its other state. In a moving coil embodiment, the coil and ferrous elements are attached to the inboard end of the locking arm, and fixed permanent magnets are mounted in a housing or yoke on either side of the coil. No external power is necessary to hold the locking arm in either the latched or unlatched state. The state of the locking arm is determined by the last direction of electric current flow in the coil.
REFERENCES:
patent: 3921107 (1975-11-01), Reuting et al.
patent: 4437078 (1984-03-01), Bando et al.
patent: 4686595 (1987-08-01), Bryer
patent: 4751595 (1988-06-01), Kishi et al.
patent: 4786995 (1988-11-01), Stupeck et al.
patent: 4831469 (1989-05-01), Hanson et al.
patent: 4868695 (1989-09-01), Quatro et al.
patent: 4881139 (1989-11-01), Hazebrouck
patent: 4903157 (1990-02-01), Malek
patent: 4980787 (1990-12-01), Iwanaga
patent: 5189570 (1993-02-01), Maeda et al.
Endo Juro
Mita Masahiro
Wasson Ken G.
Hitachi Metals Ltd.
Levy Stuart S.
Watkins Kevin M.
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