Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1987-12-22
1989-05-23
Wolff, John H.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
360 86, 360 9903, 36013034, 360133, G11B 560, G11B 1732
Patent
active
048335568
ABSTRACT:
A ceramic stabilizer is shown for minimizing the drag experienced in a magnetic interface between the stabilizer and a rapidly moving pliable magnetic disk. The stabilizer includes a stabilizing block with an opening through which a magnetic head protrudes for engagement with the disk. A flat, circumferential air bearing surface on the ceramic block surrounds the opening adjacent the disk for generating coupling forces that deform the disk out of its nominal plane and into intimate contact with a transducing gap on the head. The air bearing surface possesses an RMS surface roughness of at least 10 Angstroms because of its ceramic composition. The advancing disk interacts with the roughed air bearing surface of the stabilizer to generate a microscopic turbulence therebetween which functions as a "lubricant" to lower drag, and thereby to lower current draw on the motor rotating the disk. A preferred ceramic material is barium titanate.
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"Stabilized Wasp-Waist Head", by Nelson et al., IBM Techn. Discl. Bulletin, vol. 19, No. 5, Oct. 1976, p. 1885.
"Developing Matnetic Head Materials for High-Density Recording and Mounting", by Yukio Eguchi, Jour. of Elec. Engr., Dec. 1986, pp. 73-76.
Ser. No. 019,468, MacDonald et al., "Stabilizer Device Having an Edge Configuration for Stabilizing the Interface Between a Transducer and a Moving Medium"), filed Feb. 26, 1987.
Kosarko Gerald J.
Wagner Rodney D.
Eastman Kodak Company
Wolff John H.
Woods David M.
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