Head tracking control system for a helical scan vtr

G - Physics – 11 – B

Patent

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352/21.32

G11B 21/10 (2006.01) G11B 5/52 (2006.01) G11B 5/588 (2006.01) G11B 15/18 (2006.01)

Patent

CA 1160741

SO 1401 ABSTRACT OF THE DISCLOSURE 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 -1- 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 possible tape reproducing speeds in the range of, in the forward direction, 3 times the recording speed and, in the reverse direction, at the recorded speed. -1A-

372641

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