JPS61296515A - Magnetic head - Google Patents

Abstract

PURPOSE:To reproduce a recording signal without being affected by frequencies by inclining the boundaries between a head body and magnetic films having a high saturation flux density with respect to an intrinsic working gap for recording and reproducing data. CONSTITUTION:The linear working gap 3 is formed on the surface 2, which faces a medium in contact therewith, of the head body 1 formed of ferrite. The magnetic films 4, 5 consisting of 'Sendust(R)' having the saturation flux density higher than the saturation flux density of the ferrite are formed on both sides of the working gap 3. The boundaries 6, 7 between the head body 1 and the magnetic films 4, 5 are parallel with both sides of the head body and incline at the azimuth angle - or + with the straight lines 8, 9 parallel with the gap 3. A magnetic coil 10 is wound on the head body 1. The reproduction efficiency of the boundaries is thereby considerably decreased for the signal recorded by the working gap and therefore the working gap having an excellent reproduction characteristic is exactly reproduced.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a magnetic head for a magnetic recording device.

2. Description of the Related Art Conventionally, as shown in FIGS. 10 and 11, an operating gap 52 is formed in a medium contacting surface 51 of a head body 50 formed of a magnetic material, and a working gap 52 is formed on the inner surface of the operating gear 52. There is a magnetic head in which magnetic films 53 and 54 having a higher saturation magnetic flux density are formed and a magnetic coil 55 is wound around the head body 50.

As shown in FIGS. 12 and 13, there is also a device in which a magnetic film 53 with a high saturation magnetic flux density is formed on one side of the working gap 52.

Problems to be Solved by the Invention Conventionally, the boundary 5 between the head body 50 and the magnetic films 53 and 54
6 is parallel to the actual working gap 52 for recording and reproducing. A minute gap is formed at the boundary 5G. Therefore, when a signal recorded on the magnetic recording medium is reproduced at both the working gap 52 and the boundary 56, the reproduced signals generate a phase difference corresponding to the recording wavelength. Therefore, when the coercive force Hc of the magnetic recording medium is 10,000 e and the relative speed between the head body 50 and the magnetic recording medium is 2 m/s, the reproduction characteristics are as shown in FIG. 14.

In other words, the tendency for the playback output to decrease as the frequency increases is unavoidable in the current technology, but in such a state of playback output, the dimensions of the above-mentioned operating gap 52 and the boundary 56 and the frequency It has the disadvantage that a waving phenomenon occurs depending on the conditions.

The present invention has been made in view of these points, and an object thereof is to provide a magnetic head that can reproduce recorded signals without being affected by frequency.

A means to solve problems.

As typically shown in FIGS. 1 and 2, this invention forms an operating gap 3 in the medium contacting surface 2 of the head body 1,
The magnetic films 4 and 5 having a higher saturation magnetic flux density than the head body 1 are formed to be located at least on one side of the working gap 3, and the boundaries 6 and 7 between the head body 1 and the magnetic films 4 and 5 are parallel to the working gap 3. It is inclined with respect to the straight lines 8 and 9.

Therefore, with respect to the signal recorded by the working gap 3, the working gap 3 faithfully outputs a reproduction signal, but at the boundaries 6 and 7, the reproduction efficiency decreases due to azimuth loss, and the reproduction output by the working gap 3 becomes effective. It acts on

Embodiment A first embodiment of the present invention will be described with reference to FIGS. 1 to 3. Head body 1 made of ferrite
A linear working gap 3 is formed on the medium contacting surface 2 of the working gap 3, and magnetic films 4 and 5 made of sendust, which has a higher saturation magnetic flux density than ferrite, are formed on both sides of the working gap 3. The boundaries 6, 7 between the head body 1 and the magnetic films 4, 5 are parallel to both sides of the head body 1, but are inclined at an azimuth angle θ with respect to a straight line 8.9 parallel to the working gap 3.

A magnetic coil 1° is wound around the head body 1.

In such a configuration, the magnetic recording medium and the head body 1
Data is recorded or reproduced by moving the two relative to each other.

The signal recorded by the working gap 3 is reproduced from the working gap 3 and the boundaries 6 and 7, but since the boundaries 6 and 7 have an azimuth angle with respect to the working gap 3, the reading width of the reproduced signal is wide and the reproduction efficiency is extremely high. decreases to Therefore, the reproduction output by the actuation gap 3 acts effectively.

By the way, the coercive force Hc of the magnetic recording medium is 10000e,
When the relative speed between the head body 1 and the magnetic recording medium is 2 m/s, the relationship between the reproduction output and the recording frequency is as shown in FIG.

Next, second, third and fourth embodiments of how to set the azimuth angle of the boundary 6 or 7 with respect to the straight line 8 or 9 parallel to the working gap 3 will be described. The same parts as in the previous embodiment use the same reference numerals. Since the operation is similar to that of the previous embodiment, the explanation will be omitted.

In the second embodiment, as shown in FIGS. 4 and 5, the working gap 3 is made parallel to both sides of the head body 1, and the boundaries 6 and 7 are made into straight lines 8 and 9 parallel to the working gap 3. It is tilted to the opposite direction.

In the third embodiment, as shown in FIGS. 6 and 7, the boundaries 6 and 7 on both sides are symmetrically inclined with respect to the working gap 3.

In the fourth embodiment, as shown in FIGS. 8 and 9, a magnetic film 4 is formed on one side of the working gap 3, and the inclination of the boundary 6 with respect to the working gap 3 is different from that of the first embodiment. Similar to the example.

Effects of the Invention As described above, this invention enables recording using the working gap by tilting the boundary between the head body and the magnetic film with high saturation magnetic flux density with respect to the original working gap for recording and reproducing data. With respect to the signal, it is possible to extremely reduce the reproduction efficiency at the boundary, and therefore, it has the effect of accurately reproducing mainly the operating gap with excellent reproduction characteristics.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a first embodiment of this invention, Fig. 2 is a front view thereof, Fig. 3 is a graph showing its reproduction characteristics, and Fig. 4 shows a second embodiment of this invention. A perspective view, FIG. 5 is a front view, FIG. 6 is a perspective view showing a third embodiment of the invention, FIG. 7 is a front view, and FIG. 8 is a fourth embodiment of the invention. 9 is a front view thereof, FIG. 10 is a perspective view showing a conventional example, FIG. 11 is a front view thereof, and
2 is a perspective view showing another conventional example, FIGS. 13 and 13 are front views thereof, and FIG. 14 is a graph showing the conventional reproduction characteristics.

Claims (1)

[Claims] A working gap is formed on a medium contacting surface of a head main body formed of a magnetic material, and a magnetic film having a higher saturation magnetic flux density than the head main body is positioned on at least one side of the working gap and formed on the medium contacting surface. A magnetic head characterized in that a boundary between the head main body and the magnetic film is inclined with respect to the working gap.