Philip J Rich

US Patent:

52087131, May 4, 1993

Filed:

May 7, 1991

Appl. No.:

7/696629

Inventors:

Joshua Lindsay - Redwood City CA
Philip W. Rich - San Jose CA

Assignee:

Quantum Corporation - Milpitas CA

International Classification:

G11B 554
G11B 2122

US Classification:

360105

Abstract:

A bistable magnetic/electromagnetic latch sub-assembly for releasably latching a disk file actuator in order to park data transducer heads at a predetermined location of a data storage disk rotatably mounted to a base within a fixed disk data storage subsystem, comprises a mounting flange for mounting to the base in operative proximity to the disk file actuator, a latch body rotatably mounted to the mounting flange, the latch body including a permanent magnet and an actuator engagement latch. Plural detent pins extend from the mounting flange and limit rotational displacement of the latch body. The pins coact with the permanent magnet to hold the latch body at a release detent position and also to hold the latch body at an armed detent position wherein the actuator engagement latch is positioned to engage and latch the actuator. An electrical coil is fixed to the mounting flange in operative proximity to the permanent magnet and generates latch position switching fluxes for switching the latch body between the armed detent position and the release detent position in accordance with the direction of an intermittent actuation current flow.