Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1990-11-09
1993-02-16
Heinz, A. J.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
G11B 554
Patent
active
051876272
ABSTRACT:
A magnetic latching mechanism is provided including a permanent magnet imbedded in and completely surrounded by rubber or other resilient material. This combination is fixedly mounted to the housing or other non-moving portion of the disc drive and a small metal plate of magnetizable material is mounted to the moving actuator mechanism at a position such that it will come into contact with the crash stop and latch mechanism when the actuator is at its desired park position. The rubber or other resilient material provides the desired "soft" contact for the crash stop and the thickness of the rubber at the contact point controls the amount of latching force applied by the magnet to the metal plate. Since the latching action is purely magnetic, there is no solenoid needed to release the latch. When power is applied and the disc has attained the speed necessary to "fly" the heads, the actuator motor is used to overcome the magnetic force of the latch. Since the amount of latching force is controlled by the thickness of the rubber or other resilient material between the permanent magnet and the moving plate, it is a simple matter to select a latching force sufficient to hold the heads in the park position over the specified range of shock load of the disc drive and yet small enough to be overcome by the actuator motor.
REFERENCES:
patent: 4890176 (1989-12-01), Casey
Hickox Thomas A.
Stram Jeffrey P.
Heinz A. J.
Seagate Technology Inc.
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