Dma Systems Corporation

Dysan Corporation

Markus Meier

David A Sutton

Robert P Wartenbergh

Efim Bronshvatch

Bin-Lun Ho

Bert R Larson

Janusz Warszawski

A removable hard disc memory cartridge for use with a drive mechanism including a spindle located within a drive housing. The drive housing interior is provided with stationary position registration members which cooperate with mating side edge portions of the cartridge to provide positive positioning when the cartridge is inserted into the drive housing. A disc lock carried by the cartridge maintains the internally mounted cartridge disc in a secured locked position when the cartridge is not in use, the lock mechanism cooperating with release posts carried by the drive housing to free the disc for rotation just prior to engagement by the drive spindle. The disc has a self centering hub including a spindle referencing member having an aperture for receiving the free end of the spindle, the referencing member including angularly spaced arcuate segments closely matched to the radius of curvature of the drive spindle and providing a lateral abutment for the outer surface of the surface, the referencing member further including a spindle biasing spring laterally spaced from the arcuate segments and engageable with the outer surface of the spindle for urging the spindle into surface contact with the arcuate segments. The housing includes an end wall with an air exit port laterally displaced from the transducer access port, which provides a circumferentially oriented flow exit path for air entering the volume enclosed by the cartridge via the access port when the disc is rotated.

Removable disk cartridge

In an apparatus of the type including a magnetic transducer head adapted for flying on a fluid bearing in close proximity to a transducing surface and a gimbal apparatus to which the head is mounted for flying so as to provide flexural freedom of rotation of the head around roll and pitch axes parallel to the transducing surface and flexural freedom of translation in the direction of an axis perpendicular to the surface while restraining rotation of the head about the axis perpendicular to the surface and translation of the head in directions parallel to the surface, the gimbal apparatus comprising a thin, resilient, gimbal sheet having an external shape and interior openings defining an outer ring attachable to a gimbal sheet support at substantially opposite points on the outer ring and an inner ring spaced apart from the outer ring and attached to it by a pair of webs intersecting the outer ring at opposite interior edges between the points at which the outer ring is attached to the gimbal sheet support, the inner ring being attached to the transducer head at a point between the two webs, there is disclosed an improvement wherein both of the outer and inner rings have material removed therefrom to form a modified truss-type structure to increase the flexural freedom of translation in the direction of the axis perpendicular to the surface without upsetting the rigidity of the gimbal sheet in the plane thereof.

Gimbal assembly for flying magnetic transducer heads

Apparatus for supporting a magnetic head assembly adjacent a recording surface and for loading and retracting the head assembly. The apparatus comprises a rigid, cantilevered support arm; a thin, resilient, gimbal sheet attached to the free end of the support arm; a magnetic head assembly including a tranducing element carried by the gimbal sheet; a lift bail mounted on the head assembly; a spring-loaded force arm rotatably attached to the support arm for applying a force to the head assembly on the side thereof opposite to the transducing side thereof; a lifting finger attached to the force arm at the point where the force arm engages the head assembly, the lifting finger extending into but not engaging the lift bail when the force arm is engaging the head assembly; a pivot arm for engaging the force arm and for moving the force arm out of contact with the head assembly, the lifting finger engaging the lift bail when the force arm is moved for retracting the head assembly from the recording surface; and a centrally mounted actuator arm including a caming surface for operating the pivot arm when the support arm is retracted so as to provide for a symmetrical lift force in a space saving design.

Head loading and retraction apparatus for magnetic disc storage systems

Growing community of inventors

Carpinteria, CA, United States of America

Markus Meier