JP2722841B2 - Rotating head drum device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary head drum device which can be used for a video tape recorder (hereinafter, abbreviated as VTR).

[0002]

2. Description of the Related Art FIG. 2 is a plan view of a rotary drum unit of a conventional rotary head drum device. In the figure, 1 is a rotating drum, 3 and 5 are video heads for recording and reproducing VHS standard mode, 6, 7 are video heads for recording and reproducing VHS triple mode, and 2 and 4 are cues in VHS standard mode and VHS triple mode. This is a video head used for special reproduction such as review and still. 8 and 9 are VHS standard, 3
This is a recording / reproducing audio head that is also used for the double mode.

The operation of the conventional rotary head drum device configured as described above will be described below. When the rotary drum unit rotates in the direction A, in the VHS standard mode, the audio signals are first recorded on a magnetic tape (not shown) by the audio heads 8 and 9, and the video head 3 and the audio signal tracks recorded on the magnetic tape are recorded on the audio signal tracks. 5 to record a video signal (weight recording method).
Similarly, in the VHS triple mode, audio signals are first recorded on the magnetic tape by the audio heads 8 and 9, and video signals are recorded by the video heads 6 and 7 on the audio signals recorded on the magnetic tape. During reproduction, the same head as that used during recording is used.

[0004]

However, in the above-described configuration, in the VHS triple mode, in order to reduce interference of the audio signal with the video signal at the time of reproduction, the weight of the video signal on the magnetic tape at the time of recording is reduced. It is necessary to completely record the weight of the audio signal track recorded on the magnetic tape by the VHS triple mode recording / reproducing video heads 6 and 7 completely by a video signal so that there is no audio signal which is not recorded. That is, it is necessary to make the track width of the video heads 6 and 7 larger than the recording track pitch in the VHS triple mode. Video head 6,
7 is D, the recorded track pitch is C,
Then, the relationship of D ≧ C is required. With such a configuration, when the data is reproduced by the video heads 6 and 7 having a track width larger than the recording pitch, the data is reproduced over the adjacent recording tracks having different azimuth angles, and the signal of the adjacent track is greatly attenuated by the azimuth effect. But not completely attenuated. This causes crosstalk from an adjacent track, which adversely affects the image quality of the VTR triple mode, such as edge noise and chroma flicker.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotary head drum device which generates less noise such as edge noise and chroma flicker due to crosstalk from an adjacent track. In order to solve the above problems, the rotary head drum device of the present invention has a plurality of rotary magnetic heads having different track widths.
Helical scan type rotary head drum device
Therefore, the plurality of rotating magnetic heads are
For recording and reproducing video signals for VHS standard mode.
Magneto-magnetic head and video signal recording specialty for VHS triple mode
Pair of double azimuths with rotating magnetic heads
And a pair of VHS triple mode video signal playback
Rotating magnetic head and a pair of VHS standard mode and triple
Rotating magnetic head for recording and reproducing audio signals for mode
Dedicated to video signal recording for the VHS triple mode
The track width of the rotating magnetic head is A, and the VHS
Track of a rotating magnetic head dedicated to reproducing video signals for
Assuming that the recording width is B and the recording track pitch is C, the relationship of A ≧ C> B is satisfied , and the video for the VHS triple mode is
The rotating magnetic head dedicated to signal reproduction is the VHS triple mode.
About the rotating magnetic head dedicated to video signal recording for
Installed at a position preceding the 60-degree rotation direction
A rotary head drum device characterized by the following.

[0006]

With this structure, a video signal can be completely recorded by weight on an audio signal recorded on a magnetic tape. Further, at the time of reproduction, a high-quality VTR with little noise can be realized without being affected by crosstalk from an adjacent track.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotary head drum device according to an embodiment of the present invention will be described below with reference to the drawings. FIG.
FIG. 2 is a plan view of a rotary drum unit according to one embodiment of the present invention. 1 is a rotary drum, 3 and 5 are VHS standard mode recording / playback video heads, 10 and 11 are VHS triple mode recording dedicated video heads, 12 and 13 are VHS triple mode playback only video heads, and 8 and 9 are VHS standard and 3 This is a recording / reproducing audio head that is also used for the double mode. Also,
The recording-only video heads 10 and 11 can also be used for special playback such as VHS standard, cue, review, and still in triple mode. The track width of video heads 10 and 11 dedicated to VHS triple mode recording is A, VHS3
Assuming that the track width of the video heads 12 and 13 dedicated to the double mode reproduction is B and the recording track pitch of the VHS triple mode is C, the relationship is A ≧ C> B.

The operation of the rotary head drum device configured as described above will be described below. When the rotating drum unit rotates in the direction A, the operation in the VHS standard mode is exactly the same as that of the conventional example. In the VHS triple mode, audio signals are recorded on a magnetic tape by the audio heads 8 and 9 and video heads 12 and 13 dedicated to triple mode recording having a track width wider than the recording track pitch on the audio recording track. To record the weight of the video signal. By maintaining the relationship of A ≧ C, the audio signal is always superimposed and recorded by the video signal, and the interference of the audio signal with the video signal can be reduced. At the time of reproduction, the video signals recorded on the magnetic tape are reproduced by the video heads 12 and 13 dedicated for triple mode reproduction. Here, by maintaining the relationship of C> B, the video signal is not reproduced over the adjacent track.

As described above, according to this embodiment, there is no occurrence of noise such as edge noise and chroma flicker due to the influence of adjacent crosstalk, and it is possible to achieve high image quality in a triple mode of a VTR.

[0010]

As is apparent from the above description, according to the present invention, a video signal can be completely recorded by weight on an audio signal recorded on a magnetic tape. , And the image quality of the VTR can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a rotary drum device of the present invention.

FIG. 2 is a plan view of a conventional rotary drum device.

[Explanation of symbols]

 Reference Signs List 1 rotating drum 10 video head dedicated to 3x mode recording 11 video head dedicated to 3x mode recording 12 video head dedicated to 3x mode playback 13 video head dedicated to 3x mode playback

Claims (1)

(57) [Claims] (1) A helical scan type rotary head drum device having a plurality of rotary magnetic heads having different track widths, wherein the plurality of rotary magnetic heads are the same.
Video signal recording for VHS standard mode on head base
Rotating magnetic head for playback and video for VHS triple mode
A pair of doubles with a rotating magnetic head dedicated to signal recording
Azimuth head and a pair of video for VHS triple mode
A rotating magnetic head dedicated to signal reproduction and a pair of VHS standard
Mode and rotation for audio signal recording and playback for 3x mode
A video signal for the VHS triple mode having a magnetic head;
The track width of the rotary magnetic head dedicated to signal recording is A,
Assuming that the track width of the rotary magnetic head dedicated to reproducing the video signal for the HS triple mode is B and the recording track pitch is C, the relationship of A ≧ C> B is satisfied , and the VHS triple mode is used. Video of
The rotating magnetic head dedicated to signal reproduction is the VHS triple mode.
About the rotating magnetic head dedicated to video signal recording for
Installed at a position preceding the 60-degree rotation direction
A rotary head drum device.