JPH0697490B2 - Double azimuth head - Google Patents

Description

The present invention relates to a double azimuth head used for special reproduction in a rotary head device such as a video tape recorder.

<Outline of the Invention> The present invention relates to a double azimuth head in which two magnetic heads having different azimuths are arranged side by side in the sliding direction.

<Prior Art> A conventional double azimuth head is one in which two magnetic heads 1, 1 having different azimuths are arranged close to each other in a sliding direction and fixed to a magnetic head base 2 as shown in FIG.

The gap distance, which is the distance between the gaps 3 and 3 of this double azimuth head, is, for example, 1H and 0 in the NTSC system.
It will be 370 mm.

Fig. 4 shows a conventional double azimuth head with a gap interval of 1H.

In this case, the gap between the inner head cores 4, 4 of the magnetic heads 1, 1 is about 70μ. However, since the wire diameter of the coil 5 is 50 μ, the coil passes through the gap between the inner head cores 4, 4.
It is extremely difficult to wind 5, 5 and therefore the conventional double azimuth head with a gap of 1H has an outer head core between the inner winding groove 7, 7 and the outer outer winding groove 8, 8. 6,
Only around 6, the coils 5, 5 were wound.

FIG. 5 shows a conventional double azimuth head having a gap interval of 2H.

In this case, the distance between the inner head cores 4 and 4 of the magnetic heads 1 and 1 is increased to about 320 μ. For this reason, the coils 5, 5 are wound around the inner head cores 4, 4 between the gaps between the inner head cores 4, 4 and the inner winding grooves 7, 7.

<Problems to be Solved by the Invention> In the case of the conventional double azimuth head having the gap interval of 1H shown in FIG. 4, the coil 5 is provided only around the outer head cores 6, 6 of each magnetic head 1, 1. , 5 is not wound, and the inner head cores 4, 4 are not wound with a coil. Therefore, such a double azimuth head has a problem that it is susceptible to external noise.

Further, in the case of the conventional double azimuth head having a gap interval of 2H shown in FIG. 5, since the coils 5 and 5 are wound around the inner head cores 4 and 4 of each magnetic head 1 and 1, external noise However, the double azimuth head has twice the gap distance as compared with the one shown in FIG. 4, so that the signals reproduced by the gaps 3 and 3 of the magnetic heads 1 and 1, respectively. There has been a problem that a large time lag occurs, which is disadvantageous in the case where special reproduction of 1.5x speed and 2x speed is performed with a video tape recorder.

The present invention has been made in consideration of the above problems,
By using a double head with a gap interval that does not cause a large time lag in the reproduced signal, the influence of external noise can be reduced.

<Means for Solving Problems> The present invention provides a double azimuth head in which two magnetic heads having an outer head core and an inner head core and different in azimuth are arranged side by side in a sliding direction.
In addition to winding the coil through the inner winding groove of each magnetic head to the outer head core, by winding the coil around the outer head core of the two magnetic heads without passing through the inner winding groove, The entire double azimuth head is configured to be wound.

Further, in a double azimuth head in which two magnetic heads composed of an outer head core and an inner head core and having different azimuths are arranged side by side in the sliding direction, a coil is passed through the inner winding groove of at least one magnetic head to form a coil in the outer head core. In addition to winding, the entire magnetic head is wound by winding the coil around the outer head core and the inner head core of the magnetic head without passing through the inner winding groove. .

<Operation> As described above, by winding the coils 5 and 5 in the inner winding groove, the coil is wound around the outer head core between the outer outer winding groove and the inner winding groove by winding the coil. By winding the coil around the entire magnetic head without passing through the coil in the internal winding groove in the direction opposite to the magnetic flux passing through the outer head core by the method, or by winding the coil around both magnetic heads. It is possible to reduce the influence of external noise that occurs because the difference in the cross-sectional area ratio between the outer head core and the inner head core and the coil turn ratio that is inversely proportional to it are not realized.

<Example> An example of the double azimuth head of the present invention will be described below with reference to FIG.

As shown in FIG. 1, the double azimuth head of the present invention comprises two left and right symmetrical magnetic heads 11 and 11 having different azimuths arranged side by side in the sliding direction.

After performing the same winding as the conventional 1H double azimuth head shown in FIG. 4, the coil 15 corresponding to 5F in FIG. head
Wrap a coil around the entire 11,11. The coil 15 is wound between the inner winding groove 17 and the outer winding groove 18 about half the number of times around the outer head core 16, and the inner winding groove 17 and the outside are wound without passing through the inner winding groove 17. The coil 15 is moved in a direction in which the magnetic field is generated in the direction opposite to the magnetic field induced by the coil 15 wound around the outer head core 16 between the magnetic head 1 and the winding groove 18.
Wrap around 1,11.

Another embodiment of the double azimuth head of the present invention, as shown in FIG. 2, differs from the first embodiment described above in that the internal winding groove 17
And the coil 15 on the outer head core 11 using the external winding groove 18.
, The outer head core 11 and the inner head core 13 of one magnetic head 16 without passing the coil 15 through the inner winding groove 17.
The entire magnetic head 16 is wound by winding the magnetic head 16 and the magnetic head 16.

In the actual double azimuth head, in FIG. 1 showing the first embodiment, the magnetic head 11 in which the coil is not wound around the inner winding groove 17 and the outer winding groove 18 is the same as the other magnetic head 11. The coil may be wound around, or the coil may be wound as in the second embodiment. Further, in FIG. 2 showing the second embodiment, in the magnetic head 11 in which the coil is not wound in the inner winding groove 17 and the outer winding groove 18,
A coil may be wound in the same manner as the other magnetic head 11,
Also, the coil may be wound as in the first embodiment.

<Advantages of the Invention> Since the double azimuth head of the present invention is configured as described above, the influence of external noise caused by the fact that the cross-sectional area ratio of the outer head core and the inner head core and the coil winding ratio inversely proportional to the cross sectional area ratio are not realized. Can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic front view showing an embodiment of the double azimuth head of the present invention, FIG. 2 is a schematic front view showing another embodiment of the double azimuth head of the present invention, and FIG. 3 is a conventional double azimuth head. Fig. 4 is a schematic front view showing the state of attachment to the magnetic head base, Fig. 4 is a schematic front view of a conventional double azimuth head with a gap interval of 1H, and Fig. 5 is a schematic front view of a double azimuth head with a gap interval of 2H. is there. In the drawings, 11 is a magnetic head, 13 is a gap, 14 is an inner head core, 15 is a coil, 16 is an outer head core, 17 is an inner winding groove, and 18 is an outer winding groove.

Claims (2)

[Claims] 1. A double azimuth head comprising an outer head core and an inner head core, the two magnetic heads having different azimuths and arranged side by side in a sliding direction, wherein an outer head core is formed by passing a coil through an internal winding groove of at least one magnetic head. In addition to the coil being wound around, the coil is wound around the outer head cores of the two magnetic heads without passing through the inner winding groove so that the entire double azimuth head is wound. And double azimuth head. 2. A double azimuth head comprising an outer head core and an inner head core, the two magnetic heads having different azimuths arranged side by side in the sliding direction, wherein an outer head core is formed by passing a coil through an internal winding groove of at least one magnetic head. In addition to the coil being wound around, the outer head core and the inner head core of the one magnetic head are not passed through the inner winding groove so that the entire magnetic head is wound. Double azimuth head characterized by being wound on.