US 4,307,417 AGranted

Video signal reproducing apparatus

AssigneeVictor Company of Japan, Ltd.

InventorYoshio Tokuyama

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Abstract

A video signal reproducing apparatus uses a tape on which a video signal has been recorded along tracks disposed obliquely relative to the tape longitudinal direction. The tracks are mutually contiguous, with substantially no space therebetween. The tracks are recorded and formed by a pair of first and second rotating heads having gaps of mutually different azimuth angles. A control signal is also recorded interrelatedly with the start of the formation of each recording track by the first rotating head. A pair of first and second rotating heads have the same mutually different azimuth angles as the first mentioned first and second rotating heads and also have gaps at different height positions in the rotational planes relative to the centers of the track widths. These heads scan the tracks of the tape to reproduce the video signal. A control circuit reproduces the control signal from the tape and carries out a control so that the first rotating head starts scanning from the starting end of the track recorded and formed by the rotating head having the azimuth angle which is the same as the azimuth angle of the first rotating head. The tape transport mechanism is capable of causing the tape to travel at a speed which is different from the speed that is used at the time of recording. At least the second rotating head has a width which is greater than the track width, the width extending from the edge of the track with which scanning is to start to a phase advanced side, with respect to the tape transport direction.

In a video signal reproducing apparatus for use with a tape on which a video signal is recorded along mutually contiguous tracks disposed obliquely relative to the longitudinal tape direction, said recorded tracks having substantially no space therebetween, each of said tracks having one field of the video signal recorded thereon by first and second alternately operating rotating recording heads which have gaps of mutually different azimuth angles, a control signal recorded on said tape, said control signal being interrelated with a vertical synchronizing signal of the video signal in each track recorded by said first rotating recording head, said apparatus comprising:

first and second rotating reproducing heads which respectively have the same mutually different azimuth angles as the first and second rotating recording heads, said first and second rotating reproducing heads scanning the tracks to reproduce the video signal;
a control head for reproducing the control signal recorded on the tape;
means for generating a pulse in coincidence with a scanning of the starting end of each track by said first rotating reproducing head;
tape transport means for transporting the tape at a speed which may include a speed that is different from the speed used at the time of recording;
and control means for controlling an interrelationship between the tape travel and the rotational phase of the first and second rotating reproducing heads so that a predetermined phase difference is maintained between the control signal reproduced by said control head and the pulse corresponding to the scanning of the starting end of the track by the first rotating reproducing head;
an improvement comprising:
means for rotating the track width centers of the first and secured rotating reproducing heads in mutually different planes;
said second rotating reproducing head having a track width which is greater than the width of the recorded track, said greater width being expanded from the edge of the track where scanning starts toward a phase advance side of the track with respect to the tape travel direction;
and
said first rotating reproducing head having a track width which is less than the track width of said second rotating reproducing head.

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Abstract

Claims6