Method and apparatus for controlling surface pressure exerted on

Details Method and apparatus for controlling surface pressure exerted on Method and apparatus for controlling surface pressure exerted on

1995-09-11

1997-02-11

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

360 71, 360 75, 2423346, G11B 1543

Patent

active

056026889

ABSTRACT:
A method and apparatus for controlling surface pressure exerted on a movable magnetic head by a recording medium to provide optimum contact between the movable magnetic head and the recording medium with high precision in a wide frequency range. An estimated surface pressure exerted by the recording medium on the movable magnetic head is determined based upon an electrical simulation of the characteristics of the movable magnetic head. The estimated surface pressure exerted is compared to a reference surface pressure in order to develop a surface pressure control signal. The surface pressure tension of the magnetic recording medium and the position of the movable magnetic head may be controlled in accordance with the surface pressure control signal.

REFERENCES:
patent: 4739948 (1988-04-01), Rodal et al.
patent: 4945426 (1990-07-01), Okamoto et al.
patent: 5032936 (1991-07-01), Fujioka et al.
patent: 5153785 (1992-10-01), Muranushi et al.
"Introduction of Magnetic Recording Technology" by Yokoyama, published by Sogo Denshi Shuppansha, 10 Aug. 1985, p. 187.
"Noiseless Trick-Play Techniques Using Piezoelctric Ceramic Actuator for VTR's" by M. Kobayashi et al., National Technical Report, vol. 28, No. 3, Jun. 1982, pp. 419-425 and 427-428.

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