Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1997-02-20
1998-10-27
Tupper, Robert S.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
360109, G11B 5584
Patent
active
058285237
ABSTRACT:
A closed magnetic circuit is formed in a rotary drum by first and second yokes of a soft magnetic material and a permanent magnet. In addition, a drive coil is provided in a gap provided between the first and second yokes so as to cross a magnetic flux running in the closed magnetic circuit. The first yoke is supported by a parallel leaf spring so as to be movable along the axis of the rotary drum. An electromagnetic force is applied to the first yoke in the direction of the axis of the rotary drum by applying a control current to the drive coil. The first yoke can be shifted in this manner to a position where the electromagnetic force balances the reaction force of the parallel leaf spring. In this manner, the closed magnetic circuit generates a sufficient drive force and eliminate a leak magnetic flux that affects a head or a transformer. Moreover, the movable portion is light-weighted, and the following frequency of a dynamic tracking operation is improved, compared to a case where all the closed circuit section is disposed with a movable portion of the parallel leaf spring.
REFERENCES:
patent: 4882635 (1989-11-01), Sanai
patent: 5432658 (1995-07-01), Kajita et al.
patent: 5694273 (1997-12-01), Takeuchi
K. Yoji, Japanese Laid-Open Patent Publication No. 5-081631-A, Laid Open on Apr. 2, 1993.
Japanese Laid-Open Patent Publication No. 5-8486, Laid Open on Feb. 2, 1993.
H. Takeuchi, et al., "High Performance DTF Control System: Precision DTF Control System Using Movable Head", Paper for Lecture at Spring Meeting of Institute of Precision Engineering, 1996, pp. 1071-1072.
H. Takeuchi et al., "High Performance DTF Control System; Precision DTF Control System and Head Stand-by System During Non-Scanning Period", Paper for Regular Lecture in Kansai Area of Institute of Precision Engineering, 1996, pp. 37-38.
H. Takeuchi, et al., "Precision DTF Control System Using Observer and Modified Observer", 39th Lecture of Federation of Automatic Control, Oct. 18, 1996, pp. 91-92.
Okuda Tohru
Takeuchi Hiroaki
Conlin David G.
Daley, Jr. William J.
Sharp Kabushiki Kaisha
Tupper Robert S.
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