JP2629244B2 - Manufacturing method of magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a function of recording / reproducing (hereinafter, referred to as R / W) and erasing (hereinafter, referred to as erase) used for recording and reproducing devices such as a floppy disk and a still video. And a method of manufacturing a magnetic head.

[Prior Art] FIGS. 8 to 11 show a conventional magnetic head manufacturing process.
First, as shown in FIG. 8, a C-type core block 1 and an I-type core block 2 each made of a magnetic material such as a ferrite material, each of which is track-processed, are joined, and a glass 4 is filled in a groove 3 between the tracks. The core block 5 of the R / W magnetic head having the core blocks 1 and 2 adhered thereto is joined to the C-type core block 6 and the I-type core block 7, each of which is made of a magnetic material such as a ferrite material track-processed. And groove 8 between tracks
The core block 10 of the erasing magnetic head in which the two core blocks 6 and 7 are formed by bonding the glass 9 to the core 9 and the spacer 11 made of a crystallized glass material or the like interposed between the core blocks 5 and 10 of the two magnetic heads. Prepare Next, an adhesive such as glass or resin such as powdered glass or sealed glass is applied to both surfaces of the spacer 11, and the core block 5 of the R / W magnetic head and the core block of the erase magnetic head are applied to both surfaces.
The bonding surfaces of the core blocks 10 and 10 are joined and heated to bond the two core blocks 5 and 10 via the spacer 11 as shown in FIG. Next, the ninth
In the state shown in the figure, cut along the dotted lines X, Y, Z, and FIG.
A single magnetic head 12 is formed as shown. FIG. 10 is a plan view of the magnetic head 12, and FIG. 11 is a sectional view taken along line AA 'of FIG. In FIG. 10, reference numeral 13 denotes an adhesive layer made of the above-mentioned glass or adhesive, and in FIG.
Gap 16, 1 between 2a and erase magnetic head 12b
The distance between five.

When recording on a recording tape using the magnetic head 12 having the above configuration, the recording tape or disk is erased by using the gap 15 of the erase magnetic head portion, and the R / W
The desired information is recorded on a recording tape or a disk using the gap 16 of the magnetic head unit for use in reproduction.

[Problems to be solved by the invention]

However, in the method for manufacturing the magnetic head, since the adhesive layer 13 is present, bubbles or voids are generated due to the deterioration of the adhesive layer 13 or incomplete application of the adhesive to the spacer, so that the gap distance 14 is reduced. Inferior dimensional accuracy. In the case of glass, core blocks 5, 10 of magnetic head
The bonding temperature of the core blocks 1, 2, 6 and 7 for R / W and erasing must be sufficiently higher than the bonding temperature of, and there is a problem that it is difficult to select glass for that purpose.

[Means for solving the problem]

The present invention has been proposed in order to solve the above-mentioned problems. Each of the core block of the magnetic head for erasing and the core block of the magnetic head for recording / reproducing are track-processed, and grooves are formed in the grooves formed between the tracks. The present invention provides a method for manufacturing a magnetic head in which at least one bonding surface of both core blocks is polished after glass is filled to expose the glass, and then both core blocks are bonded with the exposed glass.

[Action]

ADVANTAGE OF THE INVENTION This invention improves the dimensional precision between gaps, prevents a track shift, and also facilitates selection of the bonding glass.

〔Example〕

Next, examples of the present invention will be described. FIG. 1 to FIG. 7 show manufacturing steps showing an embodiment of a method of manufacturing a magnetic head according to the present invention. First, as shown in FIG. 1, a C-type core block 21, an I-type core block 22 made of a magnetic material such as a ferrite material forming a core block of an R / W magnetic head, and a ferrite forming a core block of an erase magnetic head. A C-type core block 26 made of a magnetic material such as a material, an I-type core block, and a spacer 31 made of a nonmagnetic high-hardness thin plate such as a crystallized glass material are prepared. Next, as shown in FIG. 2, track processing was performed on each of the core blocks
1, 52, 53 and 54 are formed. Next, core blocks 21, 22
And 26 and 27, respectively, and fill the grooves 51 to 54 with glass 24 and 29 in the grooves 51 to 54 as shown in FIG. 3 and heat bond them to form the core block 25 of the R / W magnetic head and the core block 30 of the erase magnetic head. Form. Next, each of the I-type core blocks of the core blocks 25 and 30 is polished to expose the glass 24 and 29 on the bonding surface of both core blocks as shown in FIG. Where glass 24, 29
And the surface of the adjacent ferrite material is the same. Next, the exposed surfaces of the glass 24, 29 and the spacer 31 are joined and heated to slightly melt the glass 24, 29, as shown in FIG. Form a core block 32 of the magnetic head. Next, the dotted lines A, B, C in the state of FIG.
The single magnetic head 33 shown in FIGS. 6 and 7 is formed. FIG. 6 is a plan view of the magnetic head 33, and FIG. 7 is a sectional view taken along the line BB 'of FIG. 6 and 7,
34 is a gap of the magnetic head part 33a for R / W of the magnetic head 33,
Reference numeral 35 denotes a gap of the erasing magnetic head portion 33b of the magnetic head 33, reference numeral 36 denotes a metallic magnetic material such as sendust or amorphous formed on the core block 21 by sputtering or vapor deposition in the process shown in FIG. 2, and reference numeral 37 denotes each magnetic head portion. This is the distance between the gaps 33a and 33b.

In the method of manufacturing a magnetic head described above, FIG.
As shown in FIG. 7, there is no adhesive layer between the spacer 31 and the two magnetic heads, and bubbles and voids are generated due to deterioration of the adhesive layer or incomplete application of the adhesive to the spacer as in the conventional case. The dimensional accuracy of the distance between the gaps does not deteriorate. In the case of glass, core blocks 25 and 30 of the magnetic head
Can be performed at a temperature equal to or lower than the bonding temperature of the above. In this case, there is no need to select an adhesive material, and there is an effect of preventing the characteristic deterioration of the metal magnetic material due to the temperature.

In the above description, it is not necessary to use a spacer.
In this case, the glass only needs to be exposed on one of the bonding surfaces of the core block of the R / W magnetic head or the core block of the erase magnetic head. The metal magnetic material is used for improving the characteristics of the magnetic head, and is not always required.

〔The invention's effect〕

As described above, according to the magnetic head manufacturing method of the present invention, each of the core block of the erasing magnetic head and the core block of the recording / reproducing magnetic head is track-processed, and the grooves formed between the tracks are filled with glass. Then, at least one of the bonding surfaces of the core blocks is polished to expose the glass, and then the core blocks are bonded with the exposed glass. The accuracy of the distance between the gap of the core block of the magnetic head for use and the gap between the core blocks is improved, the track deviation of both core blocks is prevented, and the selection of the bonding glass is facilitated.

[Brief description of the drawings]

1 to 7 show an embodiment of a method of manufacturing a magnetic head according to the present invention, and FIG. 1 shows a C-type core block and an I-type core block forming a magnetic head for R / W and erase, respectively. FIG. 2 is a perspective view of the track-processed core block and the spacer, and FIG. 3 is a R / W.
FIG. 4 is a perspective view of a core block and a spacer of a magnetic head for erasing and an erasing magnetic head, FIG. 4 is a perspective view of a state in which both core blocks of a magnetic head for R / W and a magnetic head for erasing are polished, and FIG. FIG. 6 is a perspective view of a core block of a magnetic head in which an / W magnetic head and an erase magnetic head are integrated, FIG. 6 is a plan view of the magnetic head, and FIG.
8 to 11 show a conventional method of manufacturing a magnetic head. FIG. 8 shows both core blocks of a R / W magnetic head and an erase magnetic head, and a spacer. FIG. 9 is a perspective view of a core block of a magnetic head in which an R / W magnetic head and an erasing magnetic head are integrated, FIG. 10 is a plan view of the magnetic head, and FIG. FIG. 3 is a sectional view taken along line AA ′ of FIG. 5, 25: Core block of magnetic head for R / W 10, 30, ... Core block of magnetic head for erase 4, 9, 24, 29 ... Glass

Claims (1)

(57) [Claims] 1. A core block of an erasing magnetic head and a core block of a recording / reproducing magnetic head are each subjected to track processing, and a groove formed between the tracks is filled with glass, and then at least one of the core blocks is formed. A method of manufacturing a magnetic head, wherein the glass is exposed by polishing the bonding surface of (a), and then the core blocks are bonded with the exposed glass.