JPH0810842Y2 - Rotating magnetic head device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a video player, and more specifically, in a tracking servo system for recording a control (CTL) signal, the position of a control head is changed to obtain an accurate The present invention relates to a rotary magnetic head device adapted to perform tracking.

[Conventional technology]

In a tape cassette type video player, when the tape cassette is loaded into the cassette insertion slot, two sets of loading posts enter the inside of the tape located in the tape ejection slot of the tape cassette, and these loading posts are inserted into the tape ejection slot of the tape cassette. The tape is brought into contact with the outer peripheral surface of the rotary cylinder head located in front of the disk to record and reproduce the video signal.

In such a video player, in order to trace the track by the rotary head, a dedicated track for recording a control signal is provided at the lower end in the tape running direction, and the fixed control head records and reproduces the control track. The capstan motor is controlled based on the signal to track the video signal.

[Problems to be solved by the device]

Such control is performed on the take-up reel side of the tape cassette and in the normal recording / reproducing operation due to the limitation of the X value which is the value from the video track exit to the control signal pulse on the tape pattern standardized on the tape format. Sometimes the control head is installed in a position that does not get in the way. for that reason,
The position of the track to be tracked and the recording location of the control signal are recorded at different locations on the tape, and there is a discrepancy in the servo signals due to the tape extension and the mounting position of the control head between different video player models. It was

The present invention has been made to solve such a problem, and its purpose is to provide a direction of travel of a magnetic tape between a video signal track position tracked by a video head and a corresponding control track position. It is an object of the present invention to provide a rotary magnetic head device in which a control head is incorporated so as not to cause a distance shift along the axis.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a rotary head cylinder including an upper rotary cylinder having at least a pair of recording / reproducing video heads and a lower fixed cylinder coaxially arranged under the rotary head cylinder. In a rotary magnetic head device for recording / reproducing a video signal by a helical scan method, the lower fixed cylinder is arranged at a position tracing on a control track of the magnetic tape, and is actually recorded by the recording / reproducing video head. It is characterized in that the control head is mounted at a position for scanning the control track portion located below the video signal track for one field being reproduced.

〔Example〕

The present invention will be described below with reference to an embodiment shown in the drawings. Reference numeral 1 is a rotary head cylinder having an upper rotary cylinder 2 and a fixed cylinder 3 arranged coaxially with the rotary cylinder 2. Fixed cylinder 3
A guide groove 5 for running the magnetic tape 4 is formed on the outer peripheral surface thereof. A recording / reproducing head 6 is provided in a portion located in the guide groove 5 on the outer peripheral surface of the lower end of the rotary cylinder 2.
Is located. Since such a configuration is the same as that of the conventional rotary magnetic head, detailed description thereof will be omitted.

In the guide groove 5 of the fixed cylinder 3, the control track 11 in the tape format (FIG. 2) of the magnetic tape 4 is formed.
The control head 7 is mounted at a height corresponding to the dimensions of. That is, in the helical scan method, the second
As shown in the figure, the magnetic tape 4 is provided with a control track 11 of a predetermined size at the lower end in the longitudinal direction, and the video signal is 1
Since the field portion is recorded as one slanted video signal track 12, the control head 7 is fixed to the lower fixed cylinder 3
At the height position corresponding to the control track 11 at.

With such a configuration, when the recording / reproducing head 6 scans the video signal track 12A on the right side in FIG. 2, the position of the control track scanned by the control head in the related art is, for example, a position 11A apart by about 80 mm. While the tracking is performed based on the signal of the video signal track 12A in this embodiment, the tracking is performed based on the signal of the control track 11B located below the video signal track 12A. The distance to and disappears. Therefore, it is possible to eliminate the tracking error due to the extension of the tape 4 and the difference in manufacturer and model. Furthermore, since the control head 7 is directly attached to the fixed cylinder 3,
Installation error can be reduced.

[Effect of device]

As described above, in the rotary magnetic head device of the present invention, the control head is mounted on the rotary head cylinder, and its position is mounted on the portion tracing on the control track of the magnetic tape. The scanning with and can be performed without an interval in the running direction of the tape, and can be controlled without causing a tracking error. Further, since the control head is mounted on the lower fixed cylinder, the mounting error can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view schematically showing an embodiment of the present invention, and FIG. 2 is a view for explaining a recording state of a magnetic tape. In the drawings, 1 is a rotary head cylinder, 2 is a rotary cylinder, 3 is a fixed cylinder, 4 is a magnetic tape, 5 is a guide groove, 6 is a recording / reproducing head, and 7 is a control head.

Claims (1)

[Scope of utility model registration request] 1. A video in a helical scan method on a magnetic tape by a rotary head cylinder including an upper rotary cylinder having at least a pair of recording / reproducing video heads and a lower fixed cylinder coaxially arranged below the upper rotary cylinder. In a rotary magnetic head device for recording / reproducing a signal, the lower fixed cylinder is arranged at a height position for tracing on a control track of the magnetic tape, and is actually recorded / reproduced by the recording / reproducing video head. A rotary magnetic head device characterized in that a control head is mounted at a position for scanning a control track portion located below a video signal track for one field.