JPH0628630A - Magnetic head - Google Patents

Abstract

PURPOSE:To facilitate winding of a head and to enhance mass productivity by fitting a magnetic head chip and a dummy substrate to the end of a head base and providing a groove for winding on a dummy substrate. CONSTITUTION:A magnetic head chip 9 and a dummy substrate 6 are arranged on the end part of a head base 1 and a double-azimuth structure is formed. A groove 10 for winding is provided on the dummy substrate 6. Thus, winding on the base is facilitated and mass productivity is enhanced. Since the resulting magnetic head having the double-azimuth structure ensures more satisfactory head touch at the inlet side of a magnetic tape than that at the outlet side, the magnetic tape is slid from the dummy substrate 6 toward the head chip 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head,
In particular, the present invention relates to a magnetic head which has a good tape touch and is suitable for a magnetic recording / reproducing apparatus for recording short wavelength.

[0002]

2. Description of the Related Art Conventional VHS-VTR and 8 mm-VTR
A double azimuth magnetic head for use in a magnetic disk is intended for special reproduction, and therefore, for example, as shown in FIG. 1 of Japanese Utility Model Laid-Open No. 63-62918 and FIG. Further, head chips having different azimuth angles are arranged at a predetermined interval in the sliding direction of the magnetic tape, and the track heights are made uniform. Further, in a commercial VTR, a quadruple type magnetic head as disclosed in Japanese Patent Laid-Open No. 2-94010 is proposed in order to simultaneously divide and record a wideband signal.

In the conventional single azimuth structure magnetic head as shown in FIG. 3 and the double azimuth structure magnetic head as described above, there is a relationship between the head protrusion amount from the rotary cylinder and the reproduction output as shown in FIG. It turned out from our experiments. Although only the magnetic head and the magnetic tape having a relative speed of 11.6 m / sec are described here, it is also confirmed that the relationship between the head protrusion amount and the reproduction output is as shown in FIG. 4 regardless of the relative speed. There is. As shown in FIG. 4, in the magnetic head having the single azimuth structure, the reproduction output has the maximum value when the head protrusion amount from the cylinder is 25 to 35 μm. Thus, in the conventional magnetic head of single azimuth structure,
A good head touch could not be obtained unless the head protrusion amount from the cylinder was accurately controlled within a range of about 10 μm. On the other hand, the reproduction output of the magnetic head having the double azimuth structure is almost saturated when the head protrusion amount from the cylinder is 25 μm or more, and it is understood that the suitable range of the head protrusion amount is wide. From the above, if the structure of the magnetic head is a double azimuth structure, a suitable range of the head protrusion amount is wide and a magnetic head having a good head touch can be obtained.

[0004]

However, a wideband signal from now on, such as one in which a wideband signal is simultaneously divided and recorded and reproduced.
In a high-density VTR system, a magnetic head having a pair of magnetic head chips arranged on a head base by a conventional technique has a problem of crosstalk between the head chips. In order to prevent the crosstalk between the head chips, the distance between the head chips may be increased, but the good head touch effect due to the double azimuth structure cannot be obtained. Further, in the quadruple type magnetic head of the prior art, no consideration has been given to the above head touch.

[0005]

The above object can be achieved by attaching a magnetic head chip and a dummy substrate to an end portion of a head base, and further providing a groove for winding on the dummy substrate.

[0006]

By arranging the magnetic head chip and the dummy substrate at the end portion of the head base and forming the double azimuth structure, a preferable range of the amount of head protrusion from the rotary cylinder is wide and a magnetic head having a good head touch is obtained. be able to. Further, since there is only a dummy substrate in the vicinity of the magnetic head chip, crosstalk between head chips does not pose a problem even in a future wide band / high density VTR system in which wide band signals are simultaneously divided and recorded and reproduced. Further, by providing the winding groove on the dummy substrate, the head winding is also facilitated, so that it is possible to provide a magnetic head with good mass productivity.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a plan view showing an embodiment of the magnetic head of the present invention. 1 is a head base, 3 is an I core, 4 is a C core, 5 is a magnetic gap, 6 is a dummy substrate, 7 is a head winding coil, 8 is an arrow indicating the running direction of the magnetic tape,
Reference numerals 9 respectively indicate magnetic head chips. As shown in FIG. 1, by arranging the magnetic head chip (9) and the dummy substrate (6) at the end of the head base (1) and forming a double azimuth structure, a suitable range of the head protrusion amount from the rotary cylinder is set. It is possible to obtain a magnetic head that is wide and has a good head touch. Further, in the magnetic head, the head winding coil (7) must be formed of polyurethane wire or the like. The head winding coil (7) prevents external interference by performing balanced winding on the I core and C core. For this reason, head winding must be performed also on the dummy substrate (6) side. Further, the effect of the double azimuth structure shown in FIG. 4 is that the gap between the head chips is 500 to 7
It becomes most noticeable at 00 μm. However, if the gap between the head chips is set to 500 to 700 μm, the head winding becomes difficult and the mass productivity of the magnetic head becomes extremely poor. Therefore, in the present invention, by providing the groove (10) for winding on the dummy substrate (6), it is possible to provide a magnetic head with easy head winding and good mass productivity. In general, in a magnetic head having a double azimuth structure, the head touch is better on the exit side than on the magnetic tape entry side. Therefore, in the present invention, the sliding direction of the magnetic tape is changed from the dummy substrate (6) to the head chip. (9).

FIG. 2 is a plan view showing another embodiment of the magnetic head of the present invention. In this embodiment, head chips (9a) and (9b) having different azimuth angles and dummy substrates (6a) and (6b) with winding grooves are arranged on the head base so that each has a double azimuth structure. Things
The gap between the head chip (9a) and the dummy substrate (6a) was about 600 μm, and the gap between the head chips (9a) and (9b) was about 3 mm. With such a configuration, good head touch is obtained for both the magnetic heads on the input side and the output side of the magnetic tape. Further, it is possible to provide a dual magnetic head having easy head winding and good mass productivity. In the present embodiment, only the dual magnetic head is described, but it is clear that the same effect can be obtained by using the same configuration for the triple magnetic heads and the magnetic heads having three or more magnetic heads.

[0010]

As described above, according to the present invention, it is possible to obtain a magnetic head having a wide head projection amount from the rotary cylinder and a good head touch. Further, in a future wide band / high density VTR system in which a wide band signal is simultaneously divided and recorded / reproduced, crosstalk between head chips does not become a problem, and a magnetic head with good mass productivity can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a magnetic head of the present invention.

FIG. 2 is a plan view showing another embodiment of the present invention.

FIG. 3 is a plan view showing a conventional magnetic head.

FIG. 4 is a diagram showing a relationship between a head protrusion amount from a rotary cylinder and a reproduction output in a magnetic head having a single azimuth structure and a double azimuth structure.

[Explanation of symbols]

1 ... Head base, 3 ... I core, 4 ... C core, 5 ... Magnetic gap, 6 ... Dummy substrate, 7 ... Head winding coil, 8
... arrow indicating the sliding direction of the magnetic tape, 9 ... magnetic head chip, 10 ... winding groove.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenkichi Inada 1410 Inada, Katsuta City, Ibaraki Prefecture Hitachi Ltd. AV Equipment Division

Claims (3)

[Claims] 1. A VTR in which a head chip consisting of an I core and a C core and a dummy substrate are attached to an end of a head base.
A magnetic head for use in a magnetic head, wherein a groove for winding is provided on the dummy substrate. 2. The magnetic head according to claim 1, wherein the magnetic tape is arranged so that the running direction of the magnetic tape is the dummy substrate, the I core, and the C core. 3. The magnetic head according to claim 2, wherein the magnetic heads according to claim 1 having different azimuth angles are arranged at predetermined gap intervals in the sliding direction of the magnetic tape.