Magnetic fluid sealing apparatus for a magnetic disk drive

Details Magnetic fluid sealing apparatus for a magnetic disk drive Magnetic fluid sealing apparatus for a magnetic disk drive

1989-12-26

1991-10-15

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

277 80, G11B 3314

Patent

active

050579525

ABSTRACT:
A magnetic fluid sealing apparatus closes a portion between a shaft member provided at a rotation center and an external member concentrically arranged outside the shaft member. This magnetic fluid sealing apparatus includes magnetic circuit forming means, fixed to the external member, for forming a magnetc circuit between the magnetic circuit forming means and the shaft member, and a magnetic fluid held between the shaft member and the magnetic circuit forming means by the magnetic circuit. The magnetic fluid sealing apparatus also includes a scattering preventing means arranged close to the magnetic fluid and having a non-magnetic material projecting from the magnetic circuit forming means toward the shaft member.

REFERENCES:
patent: 4531846 (1985-07-01), Raj
patent: 4575103 (1986-03-01), Pedu
patent: 4989885 (1991-02-01), Iwata
Basic Theory and Experiment of Magnetic Fluid Seals by Shinichi Kamiyama, Institute of High Speed Mechaniscs, Tohoku University, pp. 379-382, May 29, 1984.
Magnetic Fluid Seals, by Shin-ichi Kamiyama, Institute of High Speed Mechanics, Tohoku University, pp. 619-622, Aug. 30, 1985.
Magluid Seal No. TR-84MF01, TR-84MF02, Technology Materials Department, Materials Research Center, Nippon Seiko, Inc.

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