JPS6316015Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a digital magnetic head using a writing width trimming method similar to the straddle erase type.

For example, magnetic heads used in floppy disk drives have erase gaps on both sides of the core's read/write gap to ensure data compatibility. Depending on the erase method, there are two types of magnetic heads: tunnel erase type and
There is a straddle erase type, but in any case, when data is written to one track, the write width is trimmed to prevent interference with data on adjacent tracks.

By the way, a conventionally known straddle erase type magnetic head has a slider 1 and a slider 1, as shown in FIGS. A cross-shaped hole 2 is drilled in the center of a non-magnetic ceramic disc, called the "Cross-shaped hole 2", into which a thin read/write core 4 with a read/write gap 3 is inserted, and a pair of erase holes are inserted on both sides of the read/write gap 3. The pole pieces 5a and 5b are arranged, and the gap is filled with a binding material to integrate them.

However, with this structure, it is necessary to provide the erase magnetic path 7 in a direction that intersects the read/write magnetic path, and it is also necessary to attach the erase coil 8 to it. The slider 1 has problems such as difficulty in positioning and holding, making assembly cumbersome, and the slider 1 having no magnetic shielding effect.

An object of the present invention is to solve the problems of the prior art as described above and to provide a digital magnetic head that is easy to assemble.

In order to achieve this purpose, the slider of the present invention is constructed of a plate-like body made of ferromagnetic material, and by devising the hole shape and the structure of the core member, the slider can be used not only as a magnetic shield, but also as an eraser ( Its feature is that it is constructed so that it also functions as a part of the magnetic path for erasing.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings. The digital magnetic head according to the present invention is
As is clear from the perspective view and cross-sectional view of the media sliding surface in FIG. 2, it can be said that the structure is basically somewhat similar to the conventional straddle erase type. That is, the read/write core 1 is connected via the read/write gap 13.
4 is attached to a core insertion hole 12 provided in the center of the slider 11. However, the shape and material of the slider 11 and the structure of the core member 20 are completely different from those of the prior art.

First, the core member 20 includes the read/write core 1
It has a thin-walled structure having an erase core 22 connected to the core 4 in a series through another gap 21. Next, the slider 11 is made of a hard ferromagnetic material such as ferrite. The core insertion hole 12 provided in the center of the slider 11 has an opening large enough for the core member to be inserted at a distance from the hole wall surface, and has a portion of the hole wall.
The erase core 22 is placed at a position where the erase cores 2a face each other.
It has a shape that can protrude toward the erase core 22 and come into contact with the erase core 22 via the gap 23. Core member 2
A non-magnetic material 24 (for example, ceramic such as barium titanate or potassium titanate) is fitted into the gap between the magnetic material slider 11 and the hole wall surface of the magnetic slider 11, and the material is bonded and integrated.

A coil 25 is fitted into the read/write core 14, and a back bar 26 forms a closed magnetic path at the rear. In addition, one end of a U-shaped core 28 around which the erase coil 27 is wound is arranged to straddle the erase core 22 and the other end to contact the magnetic slider 11, respectively.

The operation of the magnetic head is similar to that of the conventional straddle erase type, and when it is excited by the erase coil 27 during writing, the erase core 2
Magnetic flux leaks between the slider 2 and the hole wall protrusion 12a of the slider, and the write track width can be trimmed.

In the magnetic head of the present invention, the magnetic slider 1
1 has the function of not only a magnetic shield but also a part of the erase magnetic path. Although one embodiment of the present invention has been described in detail above, it is needless to say that it is not limited to the structure shown in the drawings, and the shape of the slider, the shape of the hole, the structure of the core member, etc.
It can be changed as appropriate depending on the purpose and installation condition.

Since the present invention is constructed as described above, it is not only possible to trim the write track width, but also to simplify the structure such as the arrangement of the core and coil compared to the conventional technology, making it easy to manufacture.
Furthermore, since the slider is made of ferromagnetic material, it acts as a front shield and improves magnetic properties, and the positions of the read/write gap and erase gap are quite different. Therefore, there is less mutual interference between reading/writing and erasing than in the conventional example at the same position, and specifically, waveform symmetry, peak shift, etc. will not deteriorate due to the effects of erasing. It can have many excellent practical effects.

[Brief explanation of the drawing]

1A and 1B are explanatory diagrams of the prior art, FIG. 2 is a perspective view showing an embodiment of the present invention, and FIG. 3 is a sectional view thereof. 11... Magnetic slider, 12... Core insertion hole, 13... Read/write gap, 14...
Read/write core, 20... Core member, 21...
...Gap, 22...Erase core, 23...Gap, 24...Nonmagnetic material.

Claims (1)

[Scope of utility model registration request] In a magnetic head having a structure in which a core member including a read/write core connected via a read/write gap is installed in a core insertion hole provided in the center of a slider, the core member is connected to the read/write core in a different manner. The slider is made of a magnetic material, and the core insertion hole provided in the slider is such that the core member is inserted at intervals with respect to the hole wall surface. The core member and the magnetic slider hole are shaped so that a part of the hole wall protrudes toward the erase core at opposing positions and can face the erase core via a gap. A digital magnetic head in which a non-magnetic material is inserted into the gap between the erase core and the slider to trim the write track width by applying a magnetomotive force between the erase core and the slider.