JPS6265216A - Gap joining method for magnetic head - Google Patents

Abstract

PURPOSE:To join abutting surfaces of head piece half bodies with sufficient adhesive strength at high yield by forming plural grooves in the abutting surfaces alternately and then joining them. CONSTITUTION:Grooves 31 are formed in a magnetic head piece half body 20A and groves 32 are formed in the other half body 20B. Those grooves 31 and 32 are formed in the half bodies 20A and 20B alternately at equal intervals to obtain polished surfaces which have excellent flatness as the abutting surfaces 22. When the surfaces are joined together, glass fibers G is put in the grooves 31 and 32 and heated to 400-500 deg.C to perform the joining operation. Consequently, the adhesive strength between the joined surface is excellent, so the joining strength increases and the yield of working which is about 30% conventionally is improved above 80%.

Description

[Detailed description of the invention] ,・,-11! The present invention relates to a gap junction force method for magnetic heads.

/1, and 811 points Conventionally, single magnetic materials such as various ferrites and Centast, which is an alloy magnetic material of Fe-3i-A, have been used as VTR heads for broadcasting and home use, magnetic disk heads, and audio heads with high M performance. BACKGROUND OF THE INVENTION Planted-layer brocade magnetic heads made of a laminate of heads or sender-stored plates are widely used.

Recently, in order to further improve the recording characteristics, +1 raw characteristics, wear resistance, etc. of magnetic heads, glass
(A tin film magnetic head in which a plurality of layers of soft magnetic material such as Sendust, which is an alloy magnetic material of Fe-5i-AJl, and layers of non-magnetic insulating material such as G4 and SiO2 are laminated on a plate, has received Note I+. ing.

Therefore, although the present invention will be described in connection with F) a film magnetic head, it is not limited thereto, and can be suitably applied to the above-mentioned rod magnetic head and laminated thin film magnetic head when manufacturing Sl.

The rl I mock magnetic head can be made in various ways, but! To briefly explain with reference to FIGS. J'S4 to FIG.
and the non-magnetic insulating material layer 13 to form a plurality of layers, forming a /a interlayer residence 5 /I! (Figure 4).

(b) Case-f-like νJ in the +iii magnetic laminate 15
(C) A non-magnetic insulating bonding material layer is formed on the surface of the magnetic laminate produced in steps (b) and L2 above, on the side opposite to the magnetic substrate. (d) The magnetic laminate produced in step (c) above is cut along the case f-shaped!/J groove to form a large number of double portions/
a M', Jl-I' forming residence 15a J'+
1 ('A 61), (e) A predetermined number of the fractional magnetic laminates 15a are combined with the non-magnetic material 11 of the adjacent two fractional magnetic laminates and J (the magnetic H insulating bonding material layer 18 is (f) heating the plurality of aligned magnetic laminates 15a to melt the magnetic insulating bonding material to form an integrated bed piece 20; Figure 7).

(g) Shape the outer shape of the head piece 20, then cut νJ in the direction of the line XX in FIG. I-)23
(Fig. 8), (h) sputtering the gap portion 24 and then joining the abutting surfaces 22 (Fig. 9). and dicing (m10 figure),
In history, after going through various processes such as round cutting (Fig. iTsl1), the ultimate result was the magnetic head 30 as illustrated in Fig. 11! A will be built.

In such sA manufacturing method υ, regardless of the magnetic material, 1. Step (h) Ig, that is, step 1 (FIG. 9) in which the abutting surfaces 22 are bonded after sputtering the gap portion 24 is essential.

Conventionally, in the process of joining the abutting surfaces, as shown in FIGS. 8 and 9, a chamfer 26 is provided on the corner opposite to the cap part 24, and a recess 26a defined by the chamfer 26 is formed.
A bonding material, for example, a glass fiber G, is placed at two locations: and inside the center portion 23.

Glass fiber G is melted by heating.

The abutting surfaces were thereby joined together.

However, such a bonding method has low adhesive strength and requires dicing and ringing after bonding. , 13sr
J'l' ++v sometimes separated from the butt 1 m22, which resulted in a low yield of about 30%.

Historically, the glass fiber G disposed in the recess 26a has been cut into the recess 26a by Toho inside the headpiece 21! When transporting or charging into the heating furnace, the glass fiber G may be displaced from the opening recess 26a,
In order to prevent them from falling off or falling off, great care must be taken when handling them, which can reduce work efficiency.

In addition, for the purpose of increasing the mechanical strength of the joint of one magnetic headband segment 20A, 20B when manufacturing a magnetic head that is particularly resistant to sendust, the method shown in FIGS. 12 and 13 is used.
As shown in the figure, a plurality of spot locations S are provided at equal intervals or at a predetermined ratio on the abutment surfaces 22 of the two magnetic headpiece segments 20A and 20B, and one magnetic headpiece segment 20A is provided with a plurality of spot locations S at equal intervals or at a predetermined ratio. , 20B using gold solder or silver solder has been proposed.

According to a study conducted by one of the authors, it has been found that when such a large number of spot locations S are formed, the magnetic resistance of the bonding surface portion, that is, the rear gap portion increases.

To explain further, as a result of many research experiments conducted by non-inventors, two magnetic headpieces, one piece 20A,
In order to increase the mechanical strength of the butt joint 22 of the magnetic headbands 20B and reduce the magnetic resistance, it is important to ensure that the butt surfaces of the magnetic headband segments 20A and 20B are in contact as much as possible. It is extremely effective to form a groove in the abutting surfaces of the one magnetic head piece halves 20A and 20B, and place a joining member in the groove to join the two magnetic head piece halves 20A and 20B. That's what I found out. Furthermore, the grooves drilled in the abutting surfaces may be formed to intersect with the abutting surfaces 22PJ of the respective magnetic head bead halves 20A and 2011.
- It was also found that the production process was extremely iRtj.

Once again in history, two magnetic headpiece halves 20A and 20B
It has been found that the joint points, that is, the grooves, in the abutting surface portion of , need to be arranged at approximately equal intervals, and the distance between the n joint points phase q needs to be at least 0.3 mm apart. The strip f1 of the first layer is determined to be E because the abutting surface needs to be a polished surface with good smoothness.The present invention has been made based on certain new findings.

Therefore, an object of the present invention is to provide a gap bonding method for a magnetic head that can bond abutting surfaces extremely efficiently and with a corresponding strength.6 Another object of the present invention SR, ? is a variety of magnetic heads whose abutting surfaces are stably joined and therefore have stable performance.
It is an object of the present invention to provide a gap junction method for a magnetic head that can perform the following steps.

Another object of the present invention is to provide a gap bonding method for magnetic heads that can manufacture various magnetic heads with a high material yield.

Another object of the present invention is to provide a gap bonding method for a magnetic head that can lower the resistance of the rear gap.

81-I-1-2 Objectives are achieved by the gap bonding method for a magnetic head according to the present invention. T! In summary, the present invention provides a method for manufacturing a magnetic head in which a magnetic head is manufactured by joining two magnetic head pieces (i) at their abutting surfaces to form a gap, in which the abutting surfaces of the two head piece halves are bonded together. A plurality of grooves are formed in the groove, and a bonding material is charged into the groove.
The gap joining method is characterized in that the abutting surfaces of the two headpiece pieces are then joined together by melting the joining material.
! According to a preferred embodiment of No. 1, the grooves are formed on the abutting surfaces of each headpiece segment at intersections JE, and the grooves are provided substantially at intersections IE.

Next, a gap bonding method for a magnetic head according to the present invention will be explained in more detail.

The method of the present invention can be used in manufacturing various types of magnetic heads as described above, but in this embodiment, as illustrated in FIGS. A case where the present invention is applied will be explained.

First, a magnetic laminate 15 is made on one surface of the Am board 11 by alternately laminating one layer 12 of soft magnetic material and the layer 13 of non-magnetic insulating material (FIG. 4). .

Furthermore, if the situation is false, the non-magnetic substrate 11 may be made of, for example, crystallized glass (Photoceram manufactured by Corning, P
EG3120C, 11 electric glasses manufactured by L-11, L-
15, etc.), the thickness is 500 pm, and both sides are polished to a depth of 14 m or more and a surface roughness of 150 or more.
Polished. The soft magnetic material layer 12 is made of, for example, Fe.
-3i-Au alloy magnetic material Sendust (e.g. S
i9.6%, A15.4%, balance Fe), and 2~
It is formed with a thickness of 7Bm. Moreover, the non-magnetic insulating material layer 13
is made of, for example, SiO2, AuzO], etc., and is formed in the soft magnetic material layer 121- with a thickness of 0.1 to 0.34 m. The magnetic laminate 15 produced in this way,
The total thickness of the 16 magnetic layers 1114 made up of M layers of alternating soft material layers 12 and non-magnetic insulating material layers 13 varies depending on the application, but for 8 mm VTRs it is 13 to 2.
6 gm, and 8 to 16 gm for Ia disks, and usually, one layer 12 of soft magnetic material and the layer 13 of nonmagnetic insulating material are stacked in 3 to 6 layers each in an alternating manner.

Next, in the magnetic laminate 15, as shown in FIG. It is formed in an f-shape, so that the magnetic laminate 15 has 3 to 8
Divided into mm squares.

Also, at this stage, the two-part magnetic laminate 15a is divided into one section.
are not separated individually.

Next, one of the magnetic laminates 15 located on the opposite side of the non-magnetic (non-magnetic) cover plate 11 of the magnetic one-layer body 15 subdivided into a case f-shape.
- A non-magnetic insulating bonding material 18 is applied by sputtering to the surface, that is, the surface of the non-magnetic insulating layer 13 located at the outermost layer.
Deposited to ~2gm thickness.

The first non-magnetic insulating bonding material 18 is bonded glass (Nippon Electric Glass
- GA-120, FH-11, Corning 119
9(19), especially R103SiO2-AuzO
x-based bonded glass is preferred.

When the bonded glass 18 is laminated, the fascial vegetation settlement 5 is
The magnetic laminate 15 is bent along the 4J groove 17, thereby cutting the magnetic laminate 15 into individual double-sided magnetic laminates 15a (FIG. 6).

As shown in FIG. 7, 1. Memoir and magnetism? The tJa housing 15a has a plurality of, for example, 30 to 40 bipartite magnetic laminates, if adjacent to the bonded glass plate 18 and the magnetic layer (
1) in close contact with the plate 11.

are aligned. The other bipartite magnetic laminates 15a arranged in the state shown in FIG.
brought to 0°C. As a result, the plurality of magnetic laminates 15a are joined together to form an integrated head piece 20.

According to this embodiment, it is sufficient to join the bipartite magnetic laminate 15a having an extremely small area to the If2, and thus the composite)
Gas does not stay between the joining surfaces of the A plates, and even if gas does stay, the composite substrate, that is, the double magnetic laminate 15a has a small area, so gas can be vented during joining in - minutes. As a result, the adhesive strength between the two magnetic laminates 15a is large, and variations in adhesive strength can be reduced.

In this way, 5a, ? The cut head piece 20 is cut from the line xx in FIG. 7 to form the head piece half 2.
0A and 20B, and are each subjected to predetermined forming and grooving. However, according to the present invention, there is no need for the conventional chamfering [26] as illustrated in FIGS. Grooving 31 on the butting surfaces 26 of 20A and 20B
, 32 are performed.

In this embodiment, i1!131 is formed in the headpiece half 20A, and the groove 32 is formed in the headpiece half 20B.
is formed. In this way, it is preferable that the grooves be formed in the left and right headpiece halves 20A and 20B, and of course, in some cases, one groove may span the double-edged headpiece halves. It is. By forming in this way, each head piece half body 20A, 2
Polishing can be performed without impairing the flatness of the abutting surfaces of 0B, and the flatness of the joining surfaces of the headpiece halves 20A and 20B can be prevented from deteriorating over time.
It is possible to prevent unexpected °jG failures such as separation of the joint surfaces. 1431.32 and the window 23, as will be described later, when the two pieces 20A and 20B are butted together after sputtering the gear part, a bonding material G, for example, glass fiber is applied to the 1431.32 and the window 23, as shown in FIG. (Corning Co., Ltd. 18463.7567) etc. are charged.

+iii grooves 31 and 32 have the same shape, and the 214th
According to the present invention, the shape of the groove 32 is enlarged and illustrated, 11W 32 is made larger by the amount of penetration than the diameter of the bonding material (in this embodiment, the glass fiber G) charged into the groove, for example, The diameter of the glass fiber used for bonding is 110
0-150p, the fiber tolerance is ±5
Since the diameter of the groove is 1 cm, the radius W and depth H of the groove are set to be 10 μm larger than the diameter of the fiber. Furthermore, the shape of the bottom of the groove 32 can be a curved shape with a radius R and a diameter F larger than the fiber radius, but is not limited to this. In order to provide a flat bonding surface to the abutting surface 22, it is preferable that the lengths a and b between the grooves and between each groove be set to 0°3 mm or more, and each yi31 and 32 are arranged according to arrangement 5. It is preferable that a:b=l:1 in FIG. 1 so that the positions of the glass fibers G are approximately equally spaced on the abutting surface 22.

FIG. 3 shows three x
According to example, glass fiber bar? The charging groove is intersection II.
Even in this embodiment, in which three beads are formed on the butt surface 22, the lengths a, b, and C between the grooves 31 and the outer periphery of the bead on the butt surface 22, and between each groove, are the same as those on the butt surface 22. In order to provide a smooth bonding surface, the thickness is necessarily 0.3 mm or more, and each section 31. In FIG. 1, a:b:c=1+l:l so that they are equally spaced.

According to research conducted by 11 people who have not yet developed the disease, in the example shown in Figure 1, the suitable kf is 0.3 mm for the sentence and 0.3-0.6 mm for a and b, and in the example shown in Figure 3, The diameter is 0.3mm, a
, b, and c were found to be kf A of 0.3-0.4 mm.

1- When the molding of each headpiece half body 20A, 2OB, window addition I, and welding grooving are completed as shown in FIG.
8 Next, to form a gap, spacer glass (
SiO2) is sputtered with a film thickness of 0.12 mm.

After the sputtering of the gap portion 24 is completed, the two piece halves 20A and 20B are abutted against each other at the abutting surfaces 22, and the head piece is fixed with a jig (not shown). As illustrated in Figure 1,! ! Glass fiber G is inserted into 23 and valley groove 31, 32, 33, and 4
The glass is placed in an atmosphere of 00 to 500[deg.] C. to melt the glass, and as a result, the abutting surfaces 22 are joined by the molten glass. As the glass fiber, it is preferable to use a glass fiber such as 8463.7567 manufactured by Corning Co., Ltd., as mentioned above.

According to the present invention, as described in L, the glass fiber G is
As shown in Fig. 9, the gradient fiber is not simply placed in the hole of the piece, but is inserted into a groove of approximately the same diameter, so that it does not become unnecessary or fall out of the groove. It becomes extremely easy to transport the glass fibers while they are charged in the head piece and to take them in and out of the heating furnace (t'lx), which improves the production rate. Also, according to Unpublished 1, the mating surfaces of each headpiece half 20A and 20B are 'II:
Since they are joined while being held in a bonded state, the magnetic resistance caused by the joint can be reduced.

j. Gap bonding, that is, welding of the mating surfaces of the head piece halves 20A and 20B, has been completed by 1' according to the notation method.The head piece is molded, curved surface polished on the initial surface of the tape, and diced in the conventional L order. etc. (FIG. 10), and then sliced into individual heads, thickened by MPI, etc., and a magnetic head 3o with water resistance is produced as shown in FIG. 511. The head is further pasted to the head plate and wound and wound in accordance with the prior art, resulting in a completed head product.The feature of the present invention is that the gap when manufacturing the head piece is The details of the four mysteries regarding the method of manufacturing a magnetic head from the head piece after gap bonding will be omitted.

As mentioned in 1 above, a gap-bonded head piece requires various types of additions to the individual magnetic heads, but according to the prior art, 'fl' at the joint surface of both head piece pieces: It doesn't fit well.

1 [The welding strength of the joint surface was weak and the yield was 30%, but wood 9. According to Akira, the degree of adhesion of the bonding surface is
The welding strength, that is, the bonding strength, has increased, and the yield rate after gap bonding has increased from 30% to 80%.

l. The above embodiments describe an uninvented method for manufacturing thin-film magnetic heads using Si.
Although the present invention has been described in connection with the construction, the present invention is not limited thereto, and can be applied to intermediate ferrite heads using ferrite as the magnetic material. It can also be used appropriately during v-manufacturing.

Since the gap welding method according to the present invention is configured as described in 1-, it is possible to join the abutting surfaces extremely efficiently and with a strength of 1 minute, and moreover, This has the effect that bonding can be performed stably, and therefore various magnetic heads with stable performance can be manufactured. This also brings about the result that, according to the present invention, various magnetic heads can be manufactured in 5a with improved material yield.

Figure 1 is an iE view of the magnetic head piece for explaining the gap joining method according to the present invention.

FIG. 2 is an enlarged view of the groove for inserting the glass fiber.

FIG. 3 is a front view of a magnetic head piece showing another embodiment for carrying out the gap bonding method according to the present invention.

FIG. 4 is a partial sectional view showing the structure of I[l of a magnetic head that can be manufactured by applying the method of the present invention.

FIG. 5 is a perspective view showing an embodiment of kerf machining of the magnetic laminate shown in FIG. 4.

FIG. 6 is a perspective view of a one-sided magnetic laminate.

FIG. 7 is an IF view of a small Ohett bead in which a plurality of dual magnetic laminates are arranged in a plate shape.

FIGS. 8 to 11 are explanatory diagrams for explaining the first step in the conventional method of manufacturing a thin film magnetic head using the laminated head piece shown in FIG. 7.

FIGS. 12 and 13 are +E views illustrating a conventional method of joining headpiece halves.

ll: Non-magnetic substrate 12: Soft? 1 magnetic material layer 13: Jl magnetic insulating material layer 14: Magnetic laminated film 15: Magnetic laminate 15a: Double magnetic 8-layer body 18: JFm insulation bonding material layer 20A, 20B: Half head piece 22: Butt surface 23: Window 24: Gap part 31.32.33: Groove G glass fiber Agent: Patent attorney Akira Nishi 55 Kurahashi Figure 4 Figure 5 Figure 6

Claims (1)

[Scope of Claims] 1) A method for manufacturing a magnetic head in which a magnetic head is manufactured by joining two magnetic head piece halves at their abutting surfaces to form a gap, wherein the abutting surfaces of the two head piece halves A gap characterized in that a plurality of grooves are formed in the groove, a joining material is charged into the grooves, and the abutting surfaces of the two headpiece halves are joined to each other by melting the joining material. Joining method. 2) A method according to claim 1, wherein the grooves are formed alternately at predetermined distances in the two headpiece halves along the abutting surfaces of the two headpiece halves. 3) Each groove is formed so that the bonding materials disposed in the groove and in the window portion formed in the headpiece half are arranged at approximately equal intervals. Method described. 4) The method according to claim 3, wherein the bonding material is a glass fiber, and the groove is formed somewhat larger than the shape of the glass fiber.