Head tracking control system for a helical scan VTR

Details Head tracking control system for a helical scan VTR Head tracking control system for a helical scan VTR

1981-03-13

1983-01-25

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 73, 360 70, 360 102, G11B 2110, G11B 552

Patent

active

043706851

ABSTRACT:
A video tape recording/reproducing apparatus for reproducing video signals recorded in successive parallel tracks on a magnetic tape which is adapted to be longitudinally advanced, includes first and second magnetic heads movable in a direction generally along the tracks for reproducing signals recorded therein, and first and second bi-morph leaves for mounting the magnetic heads and being operative to deflect the first and second heads, respectively, in a direction transverse to the direction along the tracks. During the scanning operation by the respective heads, the first and second bi-morph leaves are supplied with a dithering signal for wobbling the heads transversely with respect to the longitudinal direction of the record tracks, a tracking error signal to correct deviations of the head trace from the tracks to be scanned and a slant angle correction signal to correct any inclination tracking error of the first and second magnetic heads. During the non-scanning operation by the heads, a phase error correction signal is supplied to the bi-morph leaves for deflecting the magnetic heads to accurately scan the beginning of the tracks. When the longitudinal speed of the magnetic tape exceeds, in the forward direction, a speed of 2.5 times the recording speed and, in the reverse direction, a speed of 0.5 times the recording speed, an offset signal forming circuit produces an offset signal which is supplied to the bi-morph leaves during the non-scanning operations of the magnetic heads to further deflect the heads by one track pitch in the negative and positive directions, respectively, so as to maintain the operation of the bi-morph leaves in the linear operating range thereof whereby to increase the ramp of possible tape reproducing speeds to direction, 3 times the recording speed when reproducing in the forward direction, and to the recording speed when reproducing in the reverse direction.

REFERENCES:
patent: 3663764 (1972-05-01), Trost et al.
patent: 4165523 (1979-08-01), Hathaway
patent: 4287538 (1981-09-01), Sakamoto et al.
patent: 4307417 (1981-12-01), Tokuyama
patent: 4308560 (1981-12-01), Ravizza
patent: 4328518 (1982-05-01), Kawata et al.

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