JPH01220206A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To improve workability by forming a core block by butting a pair of core block half bodies in which groove working is applied on plural raw materials consisting of magnetic material via a glass sheet, and forming a single core block by slicing. CONSTITUTION:The core block half body 13 in which a groove is provided by working a rectangular parallelopiped raw material block consisting of the magnetic material such as ferrite, etc., is formed. Next, the core block half body 14 is butted with the core block half body 13 by interposing the glass sheet 15, and a block 16 is formed. Next, plural second core blocks are formed by slitting, and R-grinding is applied on the sliding plane of a tape, and furthermore, the single core 18 is formed by slicing the second core block. In such a way, it is possible to improve productivity by facilitating the workability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a magnetic head used in recording/playback equipment such as tape recorders.

[Prior art]

The manufacturing process of a conventional magnetic head is shown in FIGS. 10 to 16. First, as shown in FIG. 10, a rectangular parallelepiped material block 1 made of a magnetic material such as ferrite is prepared. Next, the material block 1 is processed to form grooves 2 as shown in FIG. Next, the bottom of the groove 2 is processed to form a core block 4 with slits 3 as shown in FIG. 12.Next, as shown in FIG. The opposite surface of the core block 4 is processed as indicated by symbol a. Next, as shown in FIG.
Pour in. Next, the tape sliding surface of the core block 4 is R
Grinding (polishing) is performed to form a core block 4 as shown in FIG. Next, it is sliced to form a single core 6 as shown in FIG.

The core 6 configured as described above forms a magnetic head with the slit 3 as a gap and the R-ground (polished) surface as a tape sliding surface.

[Problem that the invention seeks to solve]

However, in the above method for manufacturing a magnetic head,
There is a slit processing process, which increases the slit processing process and requires high slit processing precision.The glass material is selected to melt at a temperature of 500°C to 800°C to match the thermal expansion coefficient a of the core. Therefore, the cost is high, and depending on the glass pouring conditions, the processing state of the core, etc., pinholes may occur inside the glass, degrading the characteristics of the magnetic head.

The present invention was proposed to solve the above-mentioned problems, and includes a step of forming a pair of core block halves by cutting grooves into a plurality of material blocks made of magnetic material, and a process of forming a pair of core block halves using glass. A method for manufacturing a magnetic head is provided, which includes the steps of forming a core block by butting sheets together, and slicing the core block to form a single core.

[For production]

The present invention facilitates workability, reduces costs, and improves the characteristics of a magnetic head.

〔Example〕

Next, the present invention will be explained in detail. FIG. 1 to FIG. 8 are manufacturing steps showing an embodiment of the method for manufacturing a magnetic head according to the present invention. First, as shown in FIG. 1, a rectangular parallelepiped material block 11 made of a magnetic material such as ferrite is prepared. next,
The material block 11 is processed to form a core block half 13 provided with grooves 12 as shown in FIG. Next, a core block half body 14 formed in the same manner as the core block half body 13 in FIG.
5, and place a glass sheet 15 on the core block half 13.
The core block halves 14 are butted with each other interposed therebetween. At this time, an adhesive (such as epoxy resin) is applied on the glass sheet 15 in advance, and after the sheets are butted together, the adhesive is cured at a temperature of about 200° C. to form the block 16 as shown in FIG. 4. Regarding the method of adhering the core block halves 13 and 14 to the glass sheet 15, the core block halves may be made by sandwiching the glass sheet 15 with another glass sheet whose melting temperature is sufficiently lower than that of the glass sheet 15, or glass paste or the like. After abutting, they may be fused together at the melting temperature of the sandwiched glass members. Next, slits (cutting) are performed to form a plurality of second core blocks 17 as shown in FIG. FIG. 6 shows a second core block 17 whose tape sliding surface has been R-ground (polished). Next, the second core block 17 is sliced (cut) to form a single core 18. The core 18 forms the front core of the magnetic head 19 as shown in FIG. The magnetic helad 19 has a back core 20 made of a magnetic material such as ferrite, and a coil 21 wound around the back core 20.

FIG. 9 shows another embodiment of a magnetic helad 22 formed in accordance with the present invention. 23 in the figure is glass sheet 2
This is a core (front core) formed by a manufacturing method similar to the above-mentioned implementation, using a plurality of glass sheets 24 and 24 and adding a magnetic material 25 such as ferrite between them. A magnetic head is formed by winding a coil 27 around this core 23 and around a back core 26 made of a magnetic material such as ferrite.

In the method for manufacturing the magnetic head described above, there is no slit processing step, and the gap corresponding to the slit is determined by the thickness of the glass sheet. Further, the core bonding (fusing) operation is performed at the curing temperature of the adhesive (or the melting temperature of the sandwiched glass members). Furthermore, core adhesion (
Regarding pinholes (bubbles) inside the glass after fusion bonding, it is sufficient to prepare a glass sheet without pinholes in advance. In addition, the thickness of the adhesive layer (fusion layer) due to adhesion (fusion bonding) can be set to 2 μm or less, and the occurrence of pinholes in the adhesive layer (fusion area) can be prevented by Since the thickness is extremely thin, it can be completely eliminated. As a result of the above, there is no need to worry about pinholes caused by core processing conditions, etc., as in the past.

〔Effect of the invention〕

As described above, the method for manufacturing a magnetic head according to the present invention includes the steps of forming grooves in a plurality of material blocks made of magnetic material to form a pair of core block halves, and inserting the pair of core blocks through a glass sheet. It consists of a step of butting together to form a core block, and a step of slicing the core block to form a single core, which makes work easier and improves productivity. It is possible to prevent deterioration of the magnetic tape due to pinholes in the gear part, and furthermore, since a glass sheet is used, it can be manufactured at low cost.

[Brief explanation of the drawing]

1 to 8 show an embodiment of the method for manufacturing a magnetic head according to the present invention, in which FIG. 1 is a perspective view of a material block, and FIG.
The figure is a perspective view of a core block half body, FIG. 3 is a perspective view of a main part showing a state before a pair of core block halves are fused together, and
The figure is a perspective view of the main part of the core block halves fused together, Fig. 5 is a perspective view of the main part showing the core block, Fig. 6 is a perspective view of the main part of the core block after R-grinding (polishing), and Fig. 7 The figure is a perspective view of main parts showing a state in which a core block is sliced (cut) to form a single core, FIG. 8 is a diagram showing a magnetic head using the core, and FIG. 9 is a diagram showing a magnetic head according to the present invention. 10 to 15 show an example of a conventional method for manufacturing a magnetic head; FIG. A perspective view of the material block, FIG. 11 is a perspective view of the material block with grooves formed, FIG. 12 is a perspective view of the material block with slits formed, FIG. 13 is a perspective view of the back surface processed, and FIG. 14 is a perspective view of the material block with grooves formed. FIG. 15 is a perspective view of the main part after glass has been poured, FIG. 15 is a perspective view of the main part after R grinding (polishing) has been performed, and FIG. 16 is a perspective view of the main part when a single core is being formed. 1.11...Material block 13.14.
... Core block half 15.24 ... Glass sheet 8.18.23 ... Core 19.22 ... Magnetic head Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 [ Figure 15 Figure 16

Claims (1)

[Claims] A step of forming a pair of core block halves by cutting grooves into a plurality of material blocks made of magnetic material, a step of butting the pair of core blocks through a glass sheet to form a core block, and a step of forming the core block. A method of manufacturing a magnetic head, which comprises a step of slicing to form a single core.