JPS61115210A - Production of composite magnetic head - Google Patents

Abstract

PURPOSE:To joint securely composition parts and to improve a yield and reliability by fusing and packaging a nonmagnetic material in a space between a groove processing part, a recording and reproducing head core and an erasing head core. CONSTITUTION:The 1st core 8 is adhered to the 2nd core 7 having a coil winding groove with a jointing glass 17 to form a recording and reproducing gap 11. On the adhered surface of both cores a thin film is formed as a gap spacer with SiO2, etc. In the same manner, the 3rd and fourth cores 13 and 12 are processed, and the erasing head core having the prescribed width l2 and the prescribed interval l3 and the recording and reproducing head core are set by holding a nonmagnetic spacer 18. Then a nonmagnetic spacer 4 is carried on the core to be heated and fused, and packaged in the space between the groove processing part, the recording and reproducing head core and the erasing head core. After its surface is polished, it is cut along a chain line (a)-(a') then cut along a chain line (b)-(b') to obtain a head chip 1. A nonmagnetic material fusing and packaging step and an adhering step are simultaneously carried out, thereby obtaining a secure adhesive structure.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to the manufacture of a composite magnetic head in which a recording/reproducing head and an erasing head are integrated for use in a recording/reproducing device for a magnetic f-isk. It is about the method.

(Conventional Structure and its Problems) As the capacity of magnetic disk devices increases and the tracks become narrower, crosstalk from adjacent tracks during reproduction becomes a problem. Recording and
A composite magnetic head is known in which a reproducing head and an erasing head are integrated with a thin plate of non-magnetic material such as glass in between. FIG. 1 shows an example of such a composite magnetic head; FIG. 1(a) is an exploded perspective view, FIG. 1(b) is a perspective view after assembly, and FIG. Fig. 2 shows the recording state of a track when recording is performed using such a composite magnetic head. It is composed of a non-magnetic thin plate (hereinafter referred to as a spacer) 4 and a head element support body (hereinafter referred to as a slider) 5 and 6 that supports these.Next, a method for manufacturing such a composite magnetic head P will be described. Adjust the core 7°8 so that the non-magnetic parts 9 and 10 are aligned.

The cores 12 and 13 are adjusted so that the non-magnetic parts 14 and 15 are aligned with each other.

Glue 1. A pair of erasing gaps 16 are formed to form the erasing head element 3. For recording/reproducing, the length of the gap 11 of the head element 2 is set to 61, the length of the gap interval of the erasing head element 3 is set to t3, and the center of tl and the center of 63 are set to a predetermined interval t4, The spacer 4 is sandwiched and adhered with an organic adhesive. The above process consists of a bonded body (hereinafter referred to as a bed chip) 1 of a plurality of head elements 2 and 3 and a spacer 4.
The process is carried out in the state of a core that can be cut out. Thus obtained Tochi, fl slider 5.6
9, assemble with organic adhesive, and
A composite magnetic head shown in Figure (b) is obtained.

Next, the manner of recording and reproducing using a magnet in such a composite type magnetic field will be explained. As shown in Figure 2, recording and
Width t of the recording/reproducing gear of the reproducing head element 2, fll
1, a pair of erasing gears of the erasing head element 3;
Both ends of the recording track are erased with a width t2 of the width t2.

This makes it possible to create a no-signal section at both ends of the recording track, thereby preventing crosstalk between adjacent tracks during playback. Also, the recording track width is L3 and the playback is Tl.
Since this is performed with 100% of the time, stable playback can be achieved even if there is some track deviation.

However, in the magnetic head having the structure described above, the recording/reproducing head element 2 and the erasing head element 3 are bonded together, and the head chip f1 and the sliders 5 and 6 are bonded using an organic adhesive. Therefore, there were the following problems.

(2) The adhesive strength is not sufficient, and the recording/reproducing head element 2 or the erasing head element 3 peels off during the process.

■ To prevent unerased parts, record and record while aligning so that t4 shown in 1st m(e) is the specified value.
Although the reproducing head element 2 and the erasing head element 3 are bonded together, the positioning must be performed while the adhesive is applied, resulting in poor workability.

■ At this time, the adhesive flows into the gap depth regulation reference surface, impairing the accuracy of the gap depth.

■ In the environmental resistance test, a step was created at the bonding surface between the head chip 1 and the sliders 5 and 6.

(Objective of the Invention) The present invention eliminates the drawbacks of the above-mentioned conventional example, and improves the yield and reliability of the process by firmly bonding the components of the magnetic head, and further reduces the number of man-hours. O (Structure of the Invention) In order to achieve this object, in the present invention, after forming the recording/reproducing gap, the recording/reproducing track width is defined. After forming the erasing gap, the core for the recording/reproducing head that has been processed with a groove to define the erasing track width and the core for the erasing head that has been processed with a groove that defines the recording track width is placed at a predetermined interval of 9 positions. The core for the recording/reproducing head and the core for the erasing head are bonded together by melting and filling the grooved portion and the gap between the recording/reproducing head core and the erasing head core to form a composite. It is characterized by manufacturing a type magnetic head. As the non-magnetic material to be melted and filled, a low-melting glass with a softening point lower than that of the bonding glass used to form the gap is used, and the head chip and the slider made of non-magnetic material are bonded by tightly bonding the head chip and the slider. This is done by heating the glass at a temperature near the softening point of the low melting point glass.

(Explanation of Examples) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 is an explanatory diagram of the manufacturing process of a composite magnetic head chip according to an embodiment of the present invention, and FIG. 4 (,) is an exploded perspective view of a composite magnetic head manufactured according to the same embodiment.
(b) shows a perspective view after assembly, and (C) shows an enlarged plan view around the gap. Note that parts having the same functions as those in FIG. 1 are given the same reference numerals.

As shown in FIG. 3(a), the first core 8 and the second core 7 having a coil winding groove are bonded together using a bonding glass 17 to form a recording/reproducing gap 11. A gap spacer such as SiO is placed on the bonding surfaces of both cores.
□, and the lath are formed into thin films by snok, taring, etc. After forming the gap, as shown in FIG. 3(b), grooves are formed to define the track width to obtain a predetermined recording/reproducing gap width 11. It has been known for a long time in video heads, etc. The third core 13 and the fourth core 12 are processed in the same manner as above to create a predetermined erasing gap 160 width at a predetermined interval t3. The erase head core having L2 and the recording/reproducing head core are sandwiched by a spacer 18 made of a non-magnetic material such as ceramic or glass, and the dimension t4 between the center of 1 and the center of 63 is measured.
(see Figure 4(c)), place a non-magnetic material, such as a low melting point glass (spacer) 4, on the core and heat and melt it to the grooved part and the recording/reproducing part. Fill the gap with the core. (Fig. 3 (C)) After polishing the surface, it is cut between chain lines E 47 as shown in Fig. 3 (d), and then cut between rows 01, as shown in Fig. 4 (,). Get the head chigge. Next, the sliders 5 and 6 shown in FIG. 4(,) are arranged sandwiching the head element, and heat treatment is performed at a temperature near the softening point of the low melting point glass (spacer) 4, as shown in FIG. 4(h). To obtain a composite type magnetic field.

In this way, the present invention obtains a strong adhesive structure by simultaneously performing the process of filling the grooved portion with a non-magnetic core and the process of bonding the core for the recording/reproducing head and the core for the erasing head. , it is possible to bond the tochibu and the slider to glass only by heat treatment without providing a new adhesive layer.

(Effect of the invention) The manufacturing method of the present invention has the following effects.

(2) Adhesion between the recording/reproducing head core and the erasing and decoding cores is achieved by melting and filling a non-magnetic material such as glass, resulting in glass adhesion and increased adhesive strength. Therefore, handling during the process is simplified and peeling defects are eliminated. In addition, alignment when gluing the recording/reproducing head core and the erasing head core (setting t4 in Fig. 4(c)) can be done in a dry state without applying adhesive, making work easier. gets better. Furthermore, the number of man-hours can be reduced because the process of molding the glass into the track width regulating groove and the process of bonding the core for the recording/reproducing head and the core for the erasing head are performed at the same time.

■ By using low-melting glass, which has a softening point lower than that of the bonding glass used to form the gap, as the non-magnetic material to be melt-filled, it becomes possible to melt-fill the glass at a temperature lower than the gap-forming temperature. It is possible to eliminate variations in gap length due to actual heating.

■ Adhesion between the tip and the slider is done by making them stick to each other and applying heat treatment near the softening point of low-melting glass, making it easy to bond the glass and obtain a highly reliable composite magnetic head. be able to.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of the structure of a conventional composite magnetic head, in which (,) is an exploded perspective view, (b) is a perspective view after assembly,
(c) is an enlarged plan view of the vicinity of the gap, FIG. 2 is an explanatory diagram of the operating state of the composite magnetic head in FIG. FIG. 4 is a diagram for explaining the assembly in the same embodiment, where (a) is an exploded perspective view of the composite magnetic head, (b) is a perspective view after assembly, and (C) is a diagram showing the gear, This is an enlarged plan view of the surrounding area. 1... Tochitsubu, 2... Recording/reproducing head element, 3... Erasing head element, 4... Spacer (
low melting point glass), 5.6...slider, 7...(
2nd) core, 8...(1st) core, 9, 10, 1
4゜15...Nonmagnetic material part, 11...Gap for recording/reproducing, 12...(fourth) core, 13...(third
) Core, 16... Erasing gap, 17... Adhesive glass, 18... Spacer. Patent applicant: Matsushita Electric Industrial Co., Ltd. Figure 1 Figure 1 (C) Figure 2 Figure 3

Claims (3)

[Claims] (1) After forming the recording/reproducing gap, the core for the recording/reproducing head is grooved to define the recording/reproducing track width, and after forming the erasing gap, defining the erasing track width and the recording track width. By arranging grooved erase head cores at predetermined intervals and positions, and melting and filling the grooved portion and the gap between the recording/reproducing head core and the erase head core with a non-magnetic material. A method for manufacturing a composite magnetic head, comprising the steps of gluing a core for a recording/reproducing head and a core for an erasing head, and cutting the core to obtain a head chip. (2) A composite magnetic head according to claim (1), characterized in that a low melting point glass having a lower softening temperature than the bonding glass used for forming the gap is used as the nonmagnetic material to be melted and filled. manufacturing method. (3) A running guide made of a non-magnetic material is closely attached to a predetermined position on the head chip obtained by the above manufacturing method, and heat treatment is performed at a temperature near the softening point of the low melting point glass to separate the head chip and the running guide. 1. A method for manufacturing a composite magnetic head, comprising the step of bonding.