JPS6325809A - Magnetic head device - Google Patents

Abstract

PURPOSE:To improve the contacting state between a head gap and a medium to considerably improve the yield by arranging the head gap of a recording and reproducing core in a specific range with respect to the center in the lengthwise direction of a magnetic head. CONSTITUTION:A head gap 5a of a recording and reproducing core 5 is arranged in the range from the position, which is 10% length L (L is the overall length of a magnetic head 4 in the direction of an arrow A) off the center in the flow direction (the arrow A) of the medium toward the medium entrance side, to the position which is 40% length L off said center toward the medium exit side. Thus, the contacting state between the recording and reproducing head gap 5a and the medium is improved very much and is stabilized, and the yield is improved to make this device suitable for mass production. Further, the spacing loss is considerably reduced to obtain a high head output, and this device is made very suitable for high-density recording.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head device suitable for use in a floppy disk drive device.

[Conventional technology]

With the rapid spread of office computers and personal computers, the demand for floppy disk drives as external memory devices has also increased significantly.

In such a device, since the floppy disk is capable of recording and reproducing on both sides, two magnetic head devices are used, and these are arranged so as to sandwich the floppy disk.

FIG. 3 is a perspective view showing an example of such a magnetic head device, in which 1 is a support, 2 and 3 are sliders, 4 is a magnetic head, 5 is a recording/reproducing core, 5a is a helad gap, and 6 is an eraser. 5a and 5b are head gaps, and 7 is a winding.

In the figure, there are two sliders 2 on a non-magnetic support 1.
．． 3 is formed, and a magnetic head 4 is attached to one of the sliders 3. The surfaces of the slider 2.3 and the magnetic head 4 are in the same plane, and each serves as a medium sliding surface.

The magnetic head 4 includes a magnetic head core in which a recording/reproducing core 5 and an erasing core are integrated, and windings 7 respectively applied to the recording/reproducing core 5 and the erasing core 6. The recording/reproducing core 5 has a head gap 5a with a predetermined track width.
The erasing core 6 has two head gaps 6a separated from each other by approximately the track width of the head gap 5a.
, 6b.

In a floppy disk drive device, such a magnetic head device is arranged such that the recording/reproducing core 5 and the erasing core 6 are aligned in the medium flow direction (that is, in the tangential direction of the circle to the center of the floppy disk indicated by arrow A). The former is installed as the medium input side IN, and the latter as the medium output side OUT. As a result, when recording is performed using the head gap 5a of the recording/reproducing core 5, erasing is performed using the head gaps 5a and 5b of the erasing core 6 at both edges of the track resulting in a track of a predetermined width. .

In a floppy disk drive device, two such magnetic head devices are used, and the fourth magnetic head device is arranged so as to sandwich the floppy disk from both sides.
As shown in the figure, such a magnetic head device 8 has a gimbal 9.
As shown in FIG. 5, two magnetic head devices 8.8' attached to different carriages 10.10' are arranged on both sides of the floppy disk 110. At this time, the medium sliding surface of the magnetic head 4 of the negative magnetic head device faces the medium sliding surface of the slider 2 of the other magnetic head device,
The gimbal 9' attached to the substrate on the bottom side of the floppy disk 11 is extremely thick and almost fixes the magnetic head device 8'; The device 8 is designed to be easily interlocked with the surface fluctuation of the floppy disk 11, and furthermore, the center of the gimbal 9 is held down by a pivot 12 provided on the carriage 10. The position at which the magnetic head device 8 is pressed by the pivot 12 is slightly closer to the magnetic head 4. As a result, the medium sliding surface of the magnetic head 4 is pressed against the floppy disk 11, and the magnetic head device can also follow the surface wobbling of the floppy disk. Spacing losses caused by gaps are reduced.

[Problem that the invention seeks to solve]

When such a conventional magnetic head device is used in a floppy disk drive device, some head outputs exceed the desired output, but there are many cases where the head output is less than the desired output. When a floppy disk made of metal magnetic powder is used, it has been found that the yield rate at which a desired head output or higher can be obtained using the prior art is about 80%.

This is considered to be due to the following reasons.

In the conventional magnetic head device shown in FIG. 3, the total length of the recording/reproducing core 5 (length in the direction of arrow A) and the total length of the erasing core 6 are equal to each other. Furthermore, when such a magnetic head device is attached to a floppy disk drive device as shown in FIG.
1, the magnetic head device 8 tilts around the pressing point of the pivot 12, so that near the pressing point of the pivot 12, in the magnetic head 4 of FIG. 3, the recording/reproducing core 5 and the erasing core It is considered that the best condition is when the floppy disk is in contact with the floppy disk at the border of 6. From these facts, the head gap 5a of the recording/reproducing core 5 and the head gap 6a of the erasing core 6.

6b, it is preferable to arrange the head gap 5a of the recording/reproducing core 5 in the longitudinal direction of the magnetic head 4 (i.e., the direction of the medium indicated by the arrow A) in order to prevent mutual interference. The magnetic head 4 is located at a position approximately 20% of the total length of the magnetic head 4 from the center of the magnetic head 4 (in the flow direction) to the medium entrance side IN.

However, if such a magnetic head is arranged as shown in FIG. 5 and the floppy disk 11 is rotated,
It is thought that due to this rotation, the magnetic head device 8 on the side pressed by the pivot 12 is tilted so that the gap between the two magnetic head devices 8, 8' becomes wider on the medium input side, and as a result, the magnetic head device 8 on the side pressed by the pivot 12 is tilted. It is considered that the state of the magnetic head 4, 4' being pressed against the floppy disk 11 deteriorates, spacing loss increases, and head output decreases.

Of course, there are cases in which a head output higher than desired can be obtained by attaching such a conventional magnetic head device to a floppy disk drive device in the same way, and the yield rate is about 80% as described above. Given that,
This is thought to be caused by the state in which the magnetic head device is attached to the floppy disk drive device. However, maintaining the accuracy of mounting a magnetic head device that further increases this yield is extremely difficult due to the accuracy of each component such as the gimbal 8 and pivot 12, and it is also time-consuming. There used to be problems with the productivity of floppy disk drive devices.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic head device which eliminates the problems of the prior art and improves the contact between the recording and reproducing core and the medium at the helad gap.

[Means for solving problems]

In order to achieve the above object, the present invention aims at changing the spacing gap of the recording/reproducing core from a position 344 toward the medium entrance side with respect to the longitudinal center of the magnetic head. Place them within the same range (approximately 40% off-centered).

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of a magnetic head device according to the present invention, and parts corresponding to those in FIG. 3 are given the same reference numerals and redundant explanation will be omitted.

In FIG. 1, a head gap 5 of a recording/reproducing core 5 is shown.
a is offset by about 10% of the total length L of the magnetic head 4 (length in the direction of arrow A) toward the medium entrance side with respect to the longitudinal direction of the magnetic head 4, that is, the center of the medium flow direction (arrow A). It is set within the range from the position to the position offset by about 40% of the total length toward the medium exit side. The other configurations are similar to the conventional magnetic head device shown in FIG.

Here, an embodiment in which the head gap 5a is arranged at the center of the magnetic head 4 in the longitudinal direction is installed in a floppy disk drive device as shown in FIGS. 4 and 5, and a floppy disk using metal magnetic powder is installed. When the yield rate at which the desired head output was obtained was tested, it was found to be over 95%, which was a significant improvement compared to about 80% for conventional magnetic head devices. In this case, the conditions are exactly the same as the conventional conditions. That is, in the magnetic head device, Mn-Zn ferrite is used for the magnetic head core, and the gap length of the head gap 5a of the recording/reproducing core 5 is set to 0.
．． 3 μm, the slider 2°3 is made of barium titanate, the length L of the support 1 is 5.0 fl, the width is 3.5 mm,
The height was set to 2.6 mm. Furthermore, the recording/reproducing core 5
When the yield was similarly measured by varying the position of the head gap 5a, the results shown in FIG. 2 were obtained.

From this, it can be seen that in the present invention, the yield is 90% or more, and the structure has stable contact with the floppy disk.

〔Effect of the invention〕

As explained above, according to the present invention, the contact with the medium in the recording/reproducing head gap is extremely excellent and stable, and the yield is improved, making it extremely suitable for mass production. Furthermore, since spacing loss can be significantly reduced and high head output can be obtained, it is also very suitable for high-density recording.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the magnetic head device according to the present invention, and FIG. 2 shows the measurement results of the relationship between the position of the recording/reproducing head gap in the longitudinal direction of the magnetic head and the yield of the magnetic head device. FIG. 3 is a perspective view showing an example of a conventional magnetic head device, FIG. 4 is a perspective view showing how the magnetic head device is mounted on a carriage, and FIG. 5 is a perspective view showing how the magnetic head device is mounted on a carriage. FIG. 3 is a cross-sectional view showing the arrangement of two magnetic head devices. 4...Magnetic head, 5...Recording/reproduction core, 5a...Head gap, 6...
- Erasing core, 6a...Head gap. Figure 1 Figure 2 Sashiko thing ^ill -0,2L-QILO+Q2L
+0.4L The first time in the ring, 9 doggies for the I record re-master, 1 position Fig. 3 Fig. 4 Fig. 5

Claims (1)

[Claims] In a magnetic head device having an integrated magnetic head core in which a recording/reproducing core is arranged on the medium input side and an erasing core is arranged on the medium exit side, the head gap of the recording/reproducing core is set along the longitudinal direction of the magnetic head core. A magnetic head device characterized in that the position is within a range from about 10% of the total length of the magnetic head core on the medium input side to about 40% of the total length of the magnetic head core on the medium exit side with respect to the directional center.