JPS6174123A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To match exactly the mounting position of both heads to a shield plate by butting core halves of two head chips in advance to form the operating gap and mounting the result to the shield plate in this state. CONSTITUTION:The 1st core halves 6, 6' and the 2nd core halves 7, 7' of two head chips are cut off from a prescribed block and butted. Then the butted parts are bonded in advance to form the operating gap on the butted face and a head block 31 is formed by fixing it with the 2nd spacer 24 tentatively. A shield plate 33 is inserted and bonded to the lower gap of the block 31 to complete the head while applying a prescribed cutting and grinding. Thus, the gap position and depth end position of the two heads to the shield plate 33 are matched exactly.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a two-channel ink-in type magnetic head used in an electronic still camera.

Referring to FIG. 13, in the prior art magnetic head of this type, the track width (4) is approximately 60 μm, and the rack pitch (B) is 100 μm.
m, distance between two head chips (HI) (H2) (
It is extremely small, with Q being rated at 40 μm, and the two head chips are very close to each other. Therefore, since cross-dogging between the two head chips becomes a big problem, a shield plate is interposed between the head chips and the width W of the king core in the head chip is set to 0. ! l II
The present applicant has proposed a magnetic head in which @≦W≦tOW and a manufacturing method thereof in Japanese Patent Application No. 165514/1982.

However, in this prior art, it is difficult to handle small cores in the magnetic head assembly process, and in particular, no consideration is given to the problem that the cores cannot be attached accurately to symmetrical positions on both sides of the shield plate. Therefore, there is a risk that the operating gap position or depth end position of the two head chips may be shifted, resulting in a magnetic head with impaired in-line performance.

(c) Problems to be Solved by the Invention Therefore, the present invention solves the problem that it is difficult to attach the main cores to both sides of the shield plate so that they coincide exactly with each other.

ii) a means of resolving the problem The means is a manufacturing method having the following steps.

The first part forms the king core of the head chip. and separating each second core half from the block of material.

forming grooves of a predetermined depth in the first and second core biological parts to form the required size and shape of the core halves; The unnecessary parts of the rear parts formed by the grooves of these two first core half parts are joined to each other via a first spacer having a predetermined thickness, thereby forming two first core half parts. and integrating the second core half parts so as to prevent each other from contacting each other, and also integrating the second core half parts into two second core half parts tn.

The two integrated first. a step of butt-joining the second core half parts to form a gap to form a main core part; a step of inserting a second spacer into a gap created in the front part due to the rear part of the second king core part being joined via the first spacer;

The open side surface of the main core portion provided with the second spacer is polished to form a predetermined thickness 1lTi, and the polishing also removes unnecessary parts including the rear portion joined via the first spacer. and the process of excluding parts.

A step of inserting a shield member from the rear of the main core portion excluding the unnecessary portion formed by the groove, and wrapping the front side of the main core portion into which the shield member is inserted to wrap the 182 spacers and their A step of forming the front side into a predetermined shape by excluding the corresponding main core portion and extending the wrapping to the distal end side of the shield member.

(E) Function The main cores of the head chip are made of first cores of a predetermined shape that are butted against each other. Although it consists of Ig2 core halves, when manufacturing according to the present invention, the first core halves of two head chips are connected to each other,
After the and second core halves are respectively combined, the first
The core halves and I82 core halves are joined to form a working gap and attached to a shield plate. Therefore, when attached to the shield plate, the gap position and depth end position of each head match across the shield plate.

(to) Example Figure 1 (!L) (b) shows '@1 core material block (1) and $2 core material block (2) made of sendust material.
The second core material block (2) has a welding groove (
3) and an open groove (4). The welding groove (3) is filled with low melting point silver metal (5) (see Figure 2).

By slicing these material blocks, the first core half part (61, !2 core half part (7
) are separated one after another.

'@3 In figure '@1. 1st. A half body part +61 (71
grooves (8) (91CII (11
1 is provided.

The depth of these grooves (■) is 6 within the track width in Figure 1813.
It shall be set to be larger than 0 μm. Groove f81 (9)
+1[1 (Among the parts divided by 111, the part α3 shown with diagonal lines in FIG. 3 (13 is the ultimately necessary part, and the other parts are unnecessary parts. Fig. 3 finally corresponds to the first head chip, whereas
FIG. 4 corresponds to the second head chip. The (&) in Figure 4 indicates that the grooves (s'o9' + aiα
6 is provided. In Figures 3 and 4, ω1 = ω1
'.

ω2=ω2′, and ω1+ω2 is 1w or less. This ω1 + ω2 ultimately represents the width of the main core, but this is chosen to be less than 1 mm for the purpose of reducing crosstalk.
No. 65514 describes this in detail.

Then K 1=K 2. Tj=T2. W 1==W
2. hl = h2, and these dimensions require a processing accuracy of ±2 μm to ensure the accuracy of the depth end position and the track position before and after the operating gap in the subsequent process, but this accuracy can be achieved by using a precision lapping machine etc. be done.

FIG. 5 shows the unnecessary part α41a on the rear side of the second core half (7) (see FIG. 4 for aiai) t-first subbase f (joined via 1e,
This shows how the second core halves (7) (71) are combined.

Silver Roxy (C17) C18 is used as the adhesive. In addition, since the first suberna qθ will be separated in a later process, the material does not need to be specified, but if a silver lower is used as an adhesive means, it must be of a material that has good bonding properties with the silver lower and welded. Sometimes the silver temperature is 70cf) ~ 900℃
Considering that it will be used at high temperatures, the second core half (7
) The coefficient of thermal expansion is similar to (7) (If the coefficient of thermal expansion is significantly different, the difference in shrinkage will increase when the temperature returns to room temperature, causing the adhesive layer to crack and break the bond.) %2 core half (7) (
Use sendust material of the same quality as 7).

As for the first core half part (61+61) as well, as shown in Figure 6, the unnecessary part (indicated by diagonal lines) on the rear side is joined with silver locust d through the first spacer e and integrated.

At this time, the core halves (61 (61) are press-welded with their opposing surfaces aligned with the top and back surfaces as a reference. Figure 7 shows the first cores that are integrated in pairs in this way. After mirror-polishing the mating surface α9■ of the half body parts, a 5102 film e11g23 is formed as a gap spacer by vapor deposition, etc., and each core half body part (61 (61 (71 (71 (71) 1! J■ are aligned and welded to combine as shown in Figure 8. At this time, the welding temperature was set to the above silver color sheet α.
Lower than the working temperature for 90 days.

The second space fQ4 is inserted into the gap □□□ formed in front of the second space fQ4 and bonded. At this time, the vertical width (xl) of the second spacer (2a) is made smaller than the length (X2) to be polished off later. The second spacer is made of a material that has high hardness and does not easily bend during insertion.

In this part, as an adhesive, at most 1
Since a material that is processed at about 00° C. is used, there is no need to consider the magnitude of the coefficient of thermal expansion. Therefore, the first spacer α
There is no need to use sendust material as in e.

Next, in FIG. 89, the combined first. ′! 42 core half + body 1 (61 (7) ) (9) When the desired position is reached, unnecessary parts are polished off and the head prolug (311) temporarily fixed with the second spacer (24) is taken out as shown in Fig. 810. This head block circle is placed in the gap G2 below it. As shown in Fig. 11, the shield plate is inserted and attached to the shield plate (C) by bonding with glue, and the reinforcing cores (B) and (F) are bonded to its outer surface. ) consists of a magnetic material part (7) such as ferrite, a coil C3?) wound around it, and a non-magnetic material part (to) such as glass.The integrated shield Iida as described above, The head block (311) and the reinforcing core (B) C39 are wrapped with wrapping means (e.g. wrapping tape) at their front parts.
It is then wrapped and finished into the shape shown in Figure 12. At this time, the lapping not only scrapes off the second spacer (24) and SiO2 (51) but also extends to the shield plate Q.

The above manufacturing method is suitable for use with small main cores such as magnetic heads for electronic still cameras, and in particular, from the viewpoint of preventing gross talk, the head width W of the main core is 0.3 mm (
W 1. It is useful for making in-line two-channel magnetic heads with small Om. In FIG. 12, field is the working gap of the first head chip (Hl), Q, (4Q is the working gap of the second head chip (Hl), and (4υ (4 indicates the main core).

(G) Effects of the Invention According to the present invention, the core halves of two Herad chips are brought together in advance adjacent to each other, and then joined together at the same time to form an operating gap.

The respective working gaps and depth ends match.

Then, in this state, attachment to the shield plate is completed by wrapping the front surface, so that the operating gap and depth end of the two Herad chips with respect to the shield plate can be positioned symmetrically and accurately. Furthermore, in the step of combining the two horn-head chips adjacent to each other in the $2 core half body and forming them so as to form the operating gap, the dimensions are larger than the predetermined size of the main core. It also has the effect of being easy to handle. Therefore, the assembly process is facilitated.

[Brief explanation of drawings]

Figure 1, Figure 2, Figure 3, Figure 4, Figure 5, Figure 6,'
7, 188, 9, 10, 11, and 12 are all diagrams for explaining the manufacturing method of the present invention. FIG. 13 is a diagram illustrating a magnetic head to which the present invention is directed. (1)...First core material block, (2)...Second
Core material block, (61 (6') - 181 core half part, (7) (71 - gIII2 coy half s, <8
)(e+5(9r<9'raIa6avas・*, (1
119...-first spacer,... front gap, (c)... second spacer, 313... head block,
Oa--Back gap, [Yes]--Shield plate, (Hl
) (Hl) ---Head chip, vessel (A)... Operating gap, prisoner... Track width, (4 Kodou ports --- Main core.

Claims (2)

[Claims] (1) In a method for manufacturing a magnetic head comprising head chips for each of two channels arranged in-line and a shield plate interposed between the head chips, first and second magnetic heads forming the main core of the head chip are arranged. a step of separating the two core halves from the material block, and a step of forming grooves of a predetermined depth in the first and second core halves to form the necessary size and shape of the core halves; Prepare two first core half parts of the same shape in which the grooves are formed, and make unnecessary parts of the rear parts of these two first core half parts formed by the grooves have a predetermined thickness. The two first core halves are joined together via a first spacer so as to be adjacent to each other, and the two second core halves are similarly integrated. a step of butt-joining the two integrated first and second core half portions to form a main core portion, and a step of butt-joining the two integrated first and second core half portions to form a main core portion; , a step of inserting a second spacer into a gap created in the front part due to the rear part of the second main core part being joined via the first spacer; and the second spacer is provided. polishing the open side surface of the main core portion to form a predetermined track width, and removing unnecessary portions including the rear portion joined via the first spacer by the polishing; A step of inserting a shield member from the rear of the head block of the main core portion from which unnecessary portions are removed; and a step of wrapping the front side of the main core portion into which the shield member is inserted to wrap the second head block. A method for manufacturing a magnetic head comprising the steps of excluding a spacer and its corresponding main core portion and molding the front side into a predetermined shape by extending the wrapping thereof to the tip side of the shield member. (2) The width W of the main core is 0.3 mm≦W≦1.0 mm
2. A method of manufacturing a magnetic head according to claim 1, wherein a magnetic head of: 1 is manufactured.