JPH01245409A - Manufacture of magnetic head and case block for magnetic head - Google Patents

Abstract

PURPOSE:To form miniaturized magnetic head with high productibity by bonding plural core blocks to a front face plate block and housing the joined body in a case block after back core materials are fitted to the core blocks, and then, cutting the case block after gaps are filled up with a resin. CONSTITUTION:Cores 3 and 4 and a front face plate 7 are not previously prepared for one piece of magnetic head, but plural core blocks 14a and 15a are joined to a front face plate block 16 and back core materials are fitted to the plural core blocks. Then the joined body is housed in a case block and gaps are filled up with a resin. After the gaps are filled up, the joined body is cut into parts of desired dimensions. Moreover, an open hole having a width which is a little wider than the cutting width is formed along the cutting plane at the end section of the case block. Therefore, the magnetic head thus produced can be made further miniaturized and its productivity is improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method of manufacturing a magnetic head used in a magnetic recording/reproducing device such as a magnetic tape recorder, and particularly relates to a method of manufacturing a magnetic head that is highly productive and can be miniaturized. The present invention relates to a method for manufacturing an inexpensive magnetic head with good dimensional accuracy, and a case block for a magnetic head used in this manufacturing.

[Prior Art 1] Conventionally, this type of magnetic head has a single-shaped core 31 made of a magnetic material, as shown in the exploded perspective view of FIG. 9 and the sectional views of FIGS. 1θ (a) and (b). , a coil 32 wound around this core 31, a terminal 33 fixed to the lower end of the coil 32, and two magnetic gaps that are magnetically coupled to the core 31 and placed on both sides of the core 31 via a gap plate 34. 35, a front plate 38 made of a non-magnetic material that forms the tape sliding contact surface 37 together with the upper surface of the magnetic gap 35, and a case 3 that connects all these members.
It consists of 9.

The magnetic head described above first includes the single-shaped core 31.
A coil 32 and a terminal 33 are attached to the magnetic head assembly Δ, which is assembled into a magnetic gap 35 via a gap plate 34 to form a magnetic head assembly.Next, this magnetic head assembly Δ is inserted into a synthetic resin case 39, and the core A front plate 38 having the same hardness as 31.36 is placed on the upper surface of the case 39, and both are fixed to the three cases with adhesive.Then, the tape sliding surface 37 is polished into a predetermined shape. 1+ It was to be molded as shown in the figure.

In addition, as another manufacturing method, the case 39 and the front l! i
, 38 and a magnetic head are formed by integral molding using a mold, and then polished into a predetermined shape.

[Problems to be Solved by the Invention] However, in the above magnetic head, each magnetic head is created independently, each magnetic head is inserted into a synthetic resin case, and each magnetic head is manufactured one by one. However, there are disadvantages in that productivity is poor and there is a limit to miniaturization.

In particular, in the case of a magnetic head in which the audio track erasing head and the control track erasing head for v'r rt are integrated, there are two heads on both sides with the front plate in between.
Since it has a structure in which multiple cores are provided and the shape is complicated, an even more immediate solution to the above problem has been desired.

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks, the present invention aims to provide a method for manufacturing a small magnetic head with high productivity and a case block used therefor.

[Means for Solving the Problems] In order to solve the problems set forth in item 2, the present invention adheres a plurality of core blocks and a hundred-face temporary block with glass, resin, etc., and attaches a backing to the core blocks. After the core materials are butted together, they are housed in a case block, the gap is filled with resin, and then cut into predetermined dimensions to form individual magnetic head components. .

Another object of the present invention is to provide a case block which has a space for accommodating a core block and the like therein, and has a hole slightly wider than the cutting width formed at the end along the cut surface.

[Function] In the method for manufacturing a magnetic head as described above, a core block in which a plurality of cores are continuously arranged in one direction is formed from a plurality of core blocks, a front plate block, and a back core block. A strong block body is manufactured by housing the case block in a case block and filling the gap with resin. By cutting this block body into a predetermined width at a predetermined cutting plane, a large number of magnetic heads can be manufactured quickly and easily.

Further, according to the case block for a magnetic head as described above, when cutting, the case block is cut along the hole, so the outer wall of the hole is cut off, and in the case block of the magnetic head, the outer wall of the hole is cut off. The thickness is the thickness of only the inner wall of the hole. As a result, a compact magnetic head can be manufactured without reducing the strength of the case block itself.

[Example] Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows an example magnetic head manufactured using the method and case block of the present invention, which includes an outer plate 1.1, a central partition plate 2, and an outer plate I made of synthetic resin. A core 3.4, a coil (not shown), and a back core 5.6 of these cores 3.4 accommodated between each of the partition plates 2, and a core 3.4 that abuts the partition plate 2 and is between the cores 3.4. It is composed of a front plate 7 and a filler 8 such as glass or resin that fills the space between them. Note that the core 3゜4
and the front plate 7 are made of materials with similar expansion coefficients,
For example, a combination of magnetic sintered ferrite for the core 3.4 and a non-magnetic ceramic material for the moe surface temporary 7, or a combination using a magnetic sintered ferrite for the core 3.
．． A combination of using magnetic sintered ferrite for 4 and non-magnetic sintered ferrite for the front plate 7, or using Si for the core 3.4.
A combination of -ΔQ-Fe alloy and non-magnetic sintered ferrite or ceramic for the front plate 7 is used. A magnetic gap 9 is formed in each of these cores 3.4, and in this example, the gap groove 9a forming the magnetic gap 9 is assumed to reach as far as the front plate 7 in order to increase the bonding strength. It may be formed only in the core 3.4, if a sufficient amount is obtained.

A method of manufacturing the above magnetic head will be explained with reference to FIGS. 2 to 8.

First, gap i? Glass for 4+1! The upper core block material 14, in which a pair of magnetic gaps 13 filled with magnet 2 are previously formed, is sliced at a cut plane perpendicular to the gaps to obtain an upper core block 14a. The lower core block material I5 and the front plate block material (ceramics) 16 are similarly sliced to form a lower core block 15a and a front plate block 16a. Next, the joint surfaces of the upper and lower core blocks 14a, 15a are polished and bonded to the joint surface of the front plate block 16a via glass or resin (see FIG. 5). On the other hand, as shown in Figure 6, the southern part 17.18 which should constitute the back core 5.6
A plurality of coil blocks 20a consisting of a coil bobbin 20, a coil 21, and a terminal 22 are alternately fixed in advance to a back core block I9 formed in a comb-tooth shape with alternate protrusions, and these are fixed to the upper core block 14a and the lower core block 14a. A magnetic head block body 23 as shown in FIG. 7 is constructed by adhering to the back surface of the core block 15a using glass or resin. Then, this is housed in a case block 24 as shown in FIG. This case block 24 has a top plate 25, a bottom plate 26, and a partition plate 27 between them, and a side plate 27.
The upper core block 1 is connected to the upper core block 1 in the space between the top plate 25, the bottom plate 26 and the partition plate 27, respectively.
4a and the lower core block +5a are dimensioned to be inserted together with the coil bobbin 20.

'And holes 29 having a rectangular cross section are formed in the top plate 25 and the bottom plate 26, passing through the front and rear surfaces.

The width of this hole 29 is slightly larger than the cutting width e, which will be described later. Next, the space formed between the case block 24 and the magnetic head block body 23 is filled with resin and solidified to form a magnetic head block (as shown). Then, this magnetic head block is cut into a predetermined width Q, and the tape sliding surface is polished as shown in FIG. 10, and a plurality of magnetic heads and structures as shown in FIG. 1 are formed. At this time, since the cut surface comes inside both sides of the hole 29 as shown in the figure, only the inner plate 30 that forms the hole 29 remains, and this is the outer plate
As a result, the manufactured magnetic head can be made even smaller. Note that the above-mentioned cutting may be performed by a mechanical wire cutter or slitter machine, or the grinding and cutting of the tape sliding contact surface are simultaneously performed using a molded grindstone (not shown) formed in the shape of a magnetic head. You can do it like this.

Note that if a non-shrinkable unsaturated resin is used as the filler 8 of the case block, the magnetic properties of the core 3.4 will be less likely to deteriorate due to contraction and expansion caused by the resin. Furthermore, by approximating the thermal expansion coefficients of the core 3.4 and the front plate 7, dimensional accuracy can be maintained without deformation due to heat during fusion of glass or resin.

As described in detail above, in this embodiment, the case block is used to construct the magnetic I/but block, so that its manufacture is quick and easy, and the block itself is strong. And, since the case block is formed with a partition plate, the case block is solid.
Deformation due to contraction and expansion of the resin is prevented, a magnetic block body with good dimensional accuracy is manufactured, and since the amount of resin filled is small, the working time required for filling and solidification can be shortened. In addition, holes are formed in the top plate and bottom plate of the case block, which has the advantage that the product can be made smaller while maintaining the strength of the case block.

[Effects of the Invention] The present invention is as described above, and instead of preparing the core and front plate in advance as IIIg molded products for one magnetic head, multiple core blocks and front plate blocks are bonded together. Then, back core material is butted against the plurality of core blocks, these are housed in a case block, the gaps are filled with resin, and then cut into desired dimensions to obtain a large number of magnetic heads. It is possible to manufacture Okawa's magnetic head with excellent properties, no waste of materials, and stable quality, dimensions, and shape at low cost. In addition, by forming holes along the cut surface at the end of the case block that are slightly wider than the cut width, it has the excellent effect of allowing the product to be further miniaturized while maintaining the above advantages. It is something.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an overview of a magnetic head according to an embodiment of the present invention, FIG. 2 is a perspective view showing a method for manufacturing an upper core block, and FIG. 3 is a perspective view showing a method for manufacturing a lower core block. FIG. 4 is a perspective view showing the manufacturing method of the front plate block;
5 and 6 are perspective views showing a method of manufacturing a magnetic head block body, FIG. 7 is a perspective view of a magnetic head block body,
FIG. 8 is a perspective view showing a method for manufacturing a magnetic head block, FIG. 9 is a perspective view showing a method for manufacturing a conventional magnetic head, and FIG. 10(a) is a cross-sectional view showing a core portion of a conventional magnetic head. , FIG. 10(b) is a cross-sectional view showing the 011 face plate of a conventional magnetic head. The figure is a perspective view showing the general appearance of a conventional magnetic head. 3.4...Core, 7...Front plate, 8.
...Filler, 14a... Upper core block, 15a... Lower core block, 16a...
...Front plate core block, 24...Case block, 29...Vacancy.

Claims (2)

[Claims] (1) In a method for manufacturing a magnetic head in which the sliding contact surface of a magnetic tape is formed by a core made of a magnetic material and a front plate made of a non-magnetic material, a plurality of core blocks and a front plate block are bonded, and the plurality of core blocks are bonded together. A method for manufacturing a magnetic head, which comprises butting each block with a back core material, accommodating the back core material in a case block to fill a gap, and then cutting the back core material into a predetermined size. (2) Glue the core block and front plate block, match the back core material to the core block, house it in the case block to fill the gap, and then cut it to predetermined dimensions to manufacture individual magnetic heads. 1. A case block for a magnetic head, characterized in that a hole slightly wider than the cutting width is formed at an end of the case block along the cut surface.