CArriage assembly for high track density flexible magnetic disk

Details CArriage assembly for high track density flexible magnetic disk CArriage assembly for high track density flexible magnetic disk

1988-11-10

1990-11-06

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7805, 360 7812, 360104, G11B 5596, G11B 548

Patent

active

049690582

ABSTRACT:
A carriage assembly for use with high track density flexible magnetic disk drive systems that comprises a base carriage, which supports a permanent magnet, driven by a stepper motor used to achieve course positioning of the carriage assembly. A fine position acutator is attached to the base carriage by a pair of flexible metal strips that permit movement of the actuator relative to the base carriage for fine positioning of a pair of magnetic heads. The fine position actuator comprises a voice coil bobbin, an upper arm which supports an upper magnetic read/write head, a lower arm which supports a lower magnetic read/write head and a hinge which connects the upper and lower arms. An optical servo tracking assembly mounted on the actuator senses optical servo tracking information on a surface of a magnetic disk and generates a signal which activates the voice coil bobbin causing movement of the actuator relative to the base carriage. The materials used in the upper and lower arms and in the hinge are chosen so as to nullify the effects of thermal and hygroscopic expansion.

REFERENCES:
patent: 3924268 (1975-12-01), McIntosh et al.
patent: 4630145 (1986-12-01), Thompson et al.
patent: 4811140 (1989-03-01), Enami et al.
patent: 4811143 (1989-03-01), Ohashi et al.
patent: 4814916 (1989-03-01), Nishida et al.
patent: 4816939 (1989-03-01), Ford et al.
patent: 4841396 (1989-06-01), Kawasaki
patent: 4849840 (1989-07-01), Fujioka
patent: 4858040 (1989-08-01), Hazebrouck
N. Koshino and S. Ogawa, Optical Method of the Head Positioning in Magnetic Disk Systems, reprint from IEEE Transactions on Magnetics (1980).

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