JPH042409Y2 - - Google Patents

Description

[Detailed Description of the Invention] Background Technical Field of the Invention The present invention relates to a tunnel erase type magnetic head.

More specifically, the present invention relates to so-called bulk type, laminate type, and other tunnel erase type magnetic heads for floppy disks used in word processors, personal computers, and the like.

Prior Art Tunnel erase magnetic heads for floppy disks, which record, reproduce, and erase information on flexible recording media, have an optimal design that matches the drive of each company, and various types have been proposed. ing. In this case, the basic characteristics required are almost the same, but recently there has been a strong demand for higher output due to increased magnetic efficiency, smaller size, and simpler assembly process.

An example of a prior art so-called bulk type tunnel erase magnetic head is shown in FIG.

In FIG. 5, the tunnel erase type magnetic head 1 is of a so-called bulk type, and has a read/write core 21 which usually has one gap on the front surface and is approximately U-shaped. It has an erase core 25 having two gaps and having a substantially U-shape, a back core 31 for a read/write core, and a back core 35 for an erase core, which are connected to the rear ends of these cores to form a closed magnetic path.

These read/write core 21 and erase core 25 are integrated via the non-magnetic portion 5.

Windings 91 and 95 are provided in each core forming such a closed magnetic path.

In the tunnel erase type magnetic head 1, a read/write core back core 31 and an erase core back core 35 are fixed and integrated at the rear ends of the read/write core 21 and the erase core 25, respectively, to form a closed magnetic path.

For such fixing and integration, a two-component mixed type epoxy adhesive or the like is usually used, and each back core 31, 35 is
It is glued with a predetermined gap. In this case, the gap distance is, for example, about 70 to 80 μm.

However, with this type of bonding method, it takes a considerable amount of time to dry after bonding, and during that time,
There are cases where the back cores 31 and 35 are adhered to each other and the back cores 31 and 35 are misaligned, and it may not be possible to maintain a sufficient gap distance or maintain accurate fixed position accuracy.

Furthermore, the two back cores 31 and 35 must be individually bonded, which poses problems in terms of the process, such as complicated work.

Such process problems cause a decrease in work efficiency or product yield, and have a large impact on finished product costs.

Therefore, it is desired to improve such process problems and reduce production costs.

Purpose of the invention The purpose of the invention is to provide a tunnel erase system that can easily and accurately fix and integrate the head core, the back core for the read/write core, and the back core for the erase core when forming a closed magnetic path in a magnetic head, and which significantly improves productivity. The object of the present invention is to provide a type magnetic head.

DISCLOSURE OF THE INVENTION Such objects are achieved by the present invention described below. That is, the present invention provides a tunnel erase type magnetic head in which a read/write core and an erase core are connected and integrated via a non-magnetic part. This tunnel erase type magnetic head is characterized in that a back core for a read/write core and a back core for an erase core are integrated via an adhesive layer containing a filler, and this is fixed to a read/write core and an erase core.

Specific Structure of the Invention Hereinafter, the specific structure of the invention will be explained in detail according to the embodiment shown in FIGS. 1 to 4.

1 to 4 show a so-called bulk type magnetic head (hereinafter referred to as magnetic head 1) among the tunnel erase type magnetic heads of the present invention and its magnetic head core portion.

The magnetic head 1 of the present invention has a read/write core 2
A back core integrated body 3 is provided at the rear end of the erase core 1 and the erase core 25.

To explain in more detail, back core integrated body 3
is constructed by integrating a read/write core back core 31 and an erase core back core 35 via an adhesive layer 7.

The adhesive layer 7 includes an adhesive 75 and a filler 71 dispersed and added to the adhesive 75.

As the adhesive 75, a curable resin that is cured by heating, such as epoxy resin, polyurethane resin, or silicone resin, is usually used. Among these,
Epoxy resins with extremely high adhesive strength are particularly preferred.

Filler 71 is dispersed and added into such adhesive 75.

The filler 71 is preferably silica,
Nonmagnetic inorganic substances such as alumina, calcium carbonate, and magnesium oxide are used.

The average particle size of such filler 71 is 5 to 5.
The thickness should be approximately 200 μm, which is less than the thickness of the adhesive layer.

Further, the amount added may be appropriately determined depending on the type of adhesive 75 used.

By adding the filler 71 in this manner, an effect of thickening the adhesive layer 7 as a whole is obtained, and it becomes possible to increase the thickness of the adhesive layer to a certain extent. Furthermore, extremely good mechanical strength is obtained after the adhesive has hardened.

The thickness of the adhesive layer 7 is approximately the same as the thickness of the non-magnetic portion 5 provided between the read/write core 21 and the erase core 25, and is usually about 10 to 10 mm thick.
It is about 200 μm, preferably about 70 to 80 μm.

Then, one end face of the back core 31 for the read/write core and the back core 35 for the erase core 35 located perpendicular to the longitudinal direction are bonded and integrated so as to sandwich both planes of the adhesive layer 7, and the back cores are integrated. Body 3 is formed.

In order to form a closed magnetic path between the read/write core 21 and the erase core 25, such an integrated back core body 3 is bonded to the rear ends of these cores 21 and 25 with epoxy resin or the like, or is fixed with a spring or the like. and fixed.

By using such a back core integrated body 3 of the present invention, during the assembly process, it is possible to simultaneously perform two bonding operations of the back core 31 for the read/write core and the back core 35 for the erase core, which were conventionally performed, at the same time. becomes possible.

Furthermore, using the non-magnetic part 5 interposed between the read/write core 21 and the erase core 25 as a mark, the adhesive layer 7 present approximately in the center of the back core integrated body 3 is bonded so as to overlap this non-magnetic part 5. ,
By fixing and integrating them, alignment work can be performed extremely easily and accurately.

Note that the read/write back core 31 and the erase core back core 35 that constitute the integrated back core body 3 usually have a rectangular rod shape, and are made of a material such as ferrite. Its size, shape, etc. may be appropriately determined depending on the type of magnetic head 1, and are not particularly limited.

As described above, the read/write core 21 forming a part of the closed magnetic path has a read/write gap 21 on its front surface as shown in FIGS. 2 to 4.
1 and non-magnetic material filling portions 611 and 615 made of glass or the like to form the gap.

Similarly, the erase core 25 has erase caps 251, 255 and a non-magnetic material filling portion 65 for forming the gap on the front surface.

The read/write core 21 and the erase core 25 are made of materials such as ferrite, permalloy, and sendust, and although there are no particular restrictions on their shapes, they are usually U-shaped with side core portions.

Windings 91 and 95 are applied to parts of these cores 21 and 25, respectively. Incidentally, windings 91 and 95 may be provided on the back cores 31 and 35 as necessary.

The read/write core 21 and erase core 25 are
Usually, they are connected via a non-magnetic part 5 made of a plate-shaped non-magnetic material or with a non-magnetic adhesive as the non-magnetic part 5,
Fixed and integrated.

In addition, in the present invention, since the back core integrated body 3 is used, a non-magnetic material is not necessarily required for the above-mentioned non-magnetic portion 5, and the cores 21 and 25 may be glued or joined to the back core integrated body 3. , a gap may be provided between the cores 21 and 25.
In this case, the air gap becomes the non-magnetic part 5.

Generally, sliders 81 and 85 are provided on both sides of the magnetic head core formed in this way to ensure smooth sliding movement with the recording medium.

The sliders 81 and 85 are made of non-magnetic ceramic such as barium titanate, potassium titanate, calcium titanate, strontium titanate, or abrasion-resistant resin.

There is no particular restriction on the shape of the sliders 81, 85, and various shapes are possible.

In addition, various known members used in magnetic heads may be added to form the magnetic head 1 of the present invention.

The bulk type tunnel erase magnetic head has been described in detail above, but it can also be easily applied to a so-called laminate type tunnel erase magnetic head by appropriately deforming the shape of the back core integrated body 3. be.

Specific Effects of the Present Invention The tunnel erase type magnetic head of the present invention writes, reads, and erases records while being in sliding contact with a flexible recording medium.

According to the present invention, since a back core integrated body having a back core for a read/write core and a back core for an erase core is used, a closed magnetic path is formed between the read/write core and the erase core by one bonding, and alignment is extremely easy when bonding. And it will be done accurately.

Furthermore, since the back core is integrated with an adhesive layer containing filler, a sufficient gap distance can be precisely maintained and no deviation will occur.

Therefore, productivity in the assembly process is significantly improved and production costs can be reduced.

On the other hand, when the back core is integrated with a conventional adhesive layer without filler, it is difficult to maintain a sufficient gap distance with high accuracy, and misalignment may occur.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a bulk type tunnel erase type magnetic head as an embodiment of the present invention. FIG. 2 is a perspective view of the core portion of the magnetic head of the present invention after assembly. FIG. 3 is a bottom view of FIG. 2. FIG. 4 is a perspective view showing the core portion of the magnetic head of the present invention before assembly, particularly before the back core integrated body is assembled. FIG. 5 is a perspective view of a conventional bulk type tunnel erase type magnetic head. Explanation of symbols: 1... Tunnel erase type magnetic head, 21... Read/write core, 211... Read/write gap, 25... Erase core, 2
51,255...Gap for erasing, 3...Back core integrated body, 31...Back core for read/write core, 35...Back core for erase core, 5...Nonmagnetic part, 611,615,65...
Non-magnetic material filling part, 7... adhesive layer, 71... filler, 75... adhesive, 81, 85... slider, 91, 95... winding wire.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a tunnel erase type magnetic head in which a read/write core and an erase core are connected and integrated via a non-magnetic part, a back core for the read/write core and a back core for the erase core,
A tunnel erase type magnetic head characterized in that it is integrated with a read/write core and an erase core by being integrated through an adhesive layer containing filler. (2) The tunnel erase type magnetic head according to claim 1 of the utility model registration, wherein the filler is an inorganic material. (3) The tunnel erase type magnetic head according to claim 1 or 2, wherein the filler has an average particle size of 5 to 200 μm. (4) The tunnel erase type magnetic head according to any one of claims 1 to 3 of the utility model registration claim, wherein the adhesive is an epoxy adhesive. (5) The tunnel erase type magnetic head according to any one of claims 1 to 4, wherein the adhesive layer has a thickness of 10 to 200 μm.