Signal recording/reproducing device

Details Signal recording/reproducing device Signal recording/reproducing device

1988-08-08

1990-05-29

Severin, David J.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Drum record

360 84, G11B 5588

Patent

active

049300300

ABSTRACT:
An automatic tracking speed compensating drive unit 4a for a rotary drum VCR includes a deflection control coil 44 wound around a bobbin 43 mounted to a magnetic yoke assembly 47 by upper and lower spring plates 200, 100. The lower plate has a larger spring constant than the upper plate such that the "softer" upper plate absorbs substantially all thermally induced axial elongations of the bobbin, thereby avoiding tracking errors of a magnetic r/w head 5 mounted on a tab extending outwardly from the "stiffer" lower spring plate.

REFERENCES:
patent: 4337492 (1982-06-01), Brookhart et al.
patent: 4438469 (1984-03-01), Ohba et al.
"Actuator Coil Assembly Design Determines Direction of Coil Expansion", IBM TDB, Oct. 1987, vol. 30, No. 5, pp. 149-150.
"Noiseless Trick-Play Techniques Using Piezoelectric Ceramic Actuator for VTR's", National Technical Report, Jun. 1982, vol. 28, No. 3, pp. 39-47.

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