JPS6394414A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To obtain a magnetic head used for a VTR, etc., by executing a narrow track width working to a wafer, using a glass, etc., at both side parts of the track for filling and reinforcing and executing the working, joining and single-body-chipping which can form a prescribed angle at a gap. CONSTITUTION:On one side surface of a magnetic body wafer 20 composed of a 'Sendust(R)', etc., a groove 22 is formed so that plural comb booth parts 21 can remain. Next, in the same way on other surface, a groove 23 is worked and formed, a glass, etc., is filled to the groove 23, thereafter, in order to produce a prescribed azimuth angle at the wafer 20, the groove is sliced obliquely along lines l and l', and a magnetic block 26 is formed. A narrow track part is joined so as to position at the edge part of a substrate, a groove 28 is formed from a narrow track part to a comb tooth part and forward and backward parts are provided. Thereafter, a coil 32 is executed at a backward part 30, the wafer 20 is completed, a similar wafer is joined to the block 26 and an assembly 34 is obtained. From a forward part 29 of the coalesce 34 to the backward part, a groove 35 is worked a tape abutting surface 36 is specified and the comb tooth parts 21 are divided into parts. The groove is sliced at the central part of a groove 4 and a magnetic head is obtained.

Description

[Detailed description of the invention] b) Industrial application field The present invention relates to a method of manufacturing a magnetic head.

(Explanation) Conventional technology Conventionally, magnetic heads for video use have the structure shown in FIG. 2 and the structure shown in FIG. 3.The one shown in FIG. Japanese Patent Publication No. 59-1406
20 (GIIBS/22), and the one in Figure 3 is published in Utility Model Application Publication No. 150612/1989 (011BS/12).
7). By the way, in the case of Fig. 2, Mn-
Magnetic material core (LA) (11)) such as Zn ferrite material
A coil (41) is applied to a head chip having a glass (3) filled in a gap (2) and a track width defining groove by abutting them against each other. A main core (7) formed by butting magnetic cores (5a) and (5b) to form a gap (6);
) are joined together, and a coil αG is wound around the window (9) formed in both the main core (7) and the reinforcing core (8a) (81)). It is created by

All of the above magnetic heads are used by being brought into contact with a recording carrier (magnetic tape) and moved relative to each other, but the direction of movement is parallel to the longitudinal direction of the magnetic head, and the gap line is perpendicular to the direction of movement. It is formed so as to be inclined at a certain angle (azimuth angle) with respect to a certain direction.

A magnetic head of a different type from these magnetic heads as shown in FIG. 4 has also been proposed. this is,
Japanese Unexamined Patent Publication No. 110318/1988 (011BS/29)
Compared to the two-channel in-line type magnetic head shown in Fig. 1, it has almost the same configuration except that it is a single-channel type, and a pair of plate-shaped magnetic cores (10a) (10b) are joined to each other, and the joint part is It is equipped with a head chip with a gap 011 formed in the magnetic field, and its magnetic properties: 17 (10a) (10'b) The leading end opening is formed narrow according to the track width, and the rear part α3 on the opposite side is formed wide. As shown in part in FIG. 4 1b+, one of the pair of magnetic cores (10b) is provided with a groove so that the rear part q3 protrudes toward the other magnetic core (10a), and the rear part αj A coil (19) is wound around the magnetic core (10a) (101)).A non-magnetic substrate (16a) (161)) is provided on the outer surface of the magnetic core (10a) (101)).
A terminal αη is provided on the larger substrate (16b), and a lead wire of the coil 0 is connected to the terminal αη.

(c) Problems that the invention attempts to solve By the way, to the magnetic field 11' of the structure shown in FIGS. 2 and 3.

Coil formation, which is a major step in head manufacturing, requires the process of forming a single magnetic head core and then manually passing the coil winding through the window of the single unit, which impairs mass productivity. Ta. Moreover, due to the manufacturing process of the head core, this structure requires greater attention to manual winding in order to guarantee the mechanical strength of the core, so the dimensions of the head core can be reduced. Can not do it.

Therefore, it is not possible to take measures such as reducing the inductance by downsizing the herad core, or improving the head recording and reproducing efficiency by shortening the herad core magnetic path.

On the other hand, in the magnetic head of the type shown in FIG. 4, the winding process of the coil α is performed on the magnetic core (10a) (10
Since this can be carried out prior to the joining step b), it is possible to take the step of winding and forming the coil into a cylindrical shape using an automatic winding device in advance and fitting the coil into the rear portion αJ. Therefore, compared to the magnetic heads shown in FIGS. 2 and 3, the number of man-hours can be significantly reduced. Moreover, the length dimension of the magnetic head in the running direction relative to the medium is the non-magnetic substrate (16
The mechanical strength of the magnetic head is determined by the thicknesses of the magnetic cores (10a, 101) and the nonmagnetic plates (16a, 16'b). Therefore, even if the magnetic cores (10a) (10b) are configured to be 0.1 fl or less, the strength of the head is sufficient, so the width of the head core (and thus the head core itself) can be made considerably smaller. However, in this magnetic head, the track width of the magnetic head is determined by the width of the tip of the helad core, but due to the structure, there are secondary grooves on both sides of the track.
It is not possible to provide a reinforcing non-magnetic material as in the conventional example shown in Figs. This was difficult to realize due to the following problems. Furthermore, in general for VTR gears, the gear lip is tilted at a constant azimuth angle from the direction perpendicular to the direction of movement relative to the tape (that is, the direction parallel to the track width of front and rear). However, it was extremely difficult to form such a structure in this magnetic head.

The present invention solves these problems in the magnetic head of the type shown in FIG.

B) Means for Solving the Problems The manufacturing method of the present invention involves forming first grooves so that a plurality of comb teeth remain at predetermined intervals on one surface of a metal magnetic wafer, and forming a plurality of comb teeth on the other surface. The narrow track width is processed so that a narrow track remains, and the second groove created between the narrow track and the track is filled with a non-magnetic material such as glass, and then this magnetic wafer is processed to have a predetermined azimuth angle. A magnetic material block is formed by diagonally slicing the magnetic material block as shown in FIG. , After that, a third groove is inserted from the narrow track part of the block to the comb tooth part to separate the front part and the rear part, and a winding is applied to the rear part to complete the first wafer. bonding a second wafer processed and formed into a similar shape to the first wafer to form a combined object;
A fourth groove is inserted from the front to the rear of the combined object to specify the tape contact surface of each head chip, and the @4
The plurality of comb tooth portions are divided by grooves, and then the combined product is sliced into head chip units.

(During the processing of magnetic wafers for Hakui, the track width of narrow tracks is processed, and both sides of the narrow tracks are filled and reinforced with non-magnetic material such as glass, which causes deformation of the track width in the post-process. Never.

In addition, the magnetic wafer is sliced diagonally according to a predetermined azimuth angle, and then it is bonded to a substrate and made into a single chip to take advantage of this azimuth angle, so the gap of the completed magnetic head is has.

(f) Examples The method of the present invention will be explained with reference to examples shown in FIGS. 5 to 7.

First, on one side of the magnetic wafer ■ made of sendust material shown in FIG. . Next, a second groove is formed on the other surface (opposite surface) using a similar dicing machine, as shown in FIG. 5, to form a plurality of narrow track portions □□□. And in the second groove there is a glass (5)
Fill it with. In addition, the width of the narrow part η (for swords is 5 to 10μ)
It is possible to process up to m. Next, this magnetic wafer ■ is
Slice along II+Ilf.

This (tt+ +gf) is inclined by a certain angle (θ) with respect to the line m - m' perpendicular to the ridgeline of the narrow track portion (2 bumps), and this will become the azimuth angle of the gap in the magnetic head that will be completed later. As shown in FIG. 5 (dJ), the thus cut magnetic block (2) forms an angle of θ between the upper and lower surfaces of the flat block and the direction perpendicular to the ridgeline of the narrow track portion U.

This magnetic block (2) is bonded to a non-magnetic substrate using a low melting point glass frizz as shown in FIG. 6 (al).

Next, as shown in FIG. 6 (tb+), a third groove (2) is inserted from the narrow track portion to the comb-teeth ring to form a front portion (2) and a rear portion (3). Next, as shown in FIG. 6, a gap spacer 01) is formed at the upper end of the front part, and a coil is attached to the rear part (2).

This coil is previously created in a shape corresponding to the shape of the rear part (2) using an automatic winding machine, and is fitted into the rear part (2).

Then, the lead wire (to) is soldered to a terminal (to) provided on the board. Furthermore, a magnetic material block ■ of FIG. 6 to+ is used which has a shape similar to that shown in FIG. 6 tal.
Then, they are aligned and joined using an adhesive, a wire, or a low melting point frit to obtain the combined product shown in FIG. 6 (■).

Then, as shown in FIG. 7, a fourth groove (to) is inserted from the front part (2) of the combined object @ toward the rear to specify the tape contact surface (to) of each of the head chips. The fourth groove also divides the plurality of comb tooth portions. Finally, at the center of the fourth groove (to), it is sliced along ( Perspective view,(
b) is a front view. Although this magnetic head has a sufficient contact surface with the recording medium, the track width is considerably narrower than that of the head shown in FIG. Furthermore, V.T.
The gap (9) forms a constant angle θ (azimuth angle) with the direction m-m' perpendicular to the relative movement direction #-111 of the recording medium and the helide so that it can be used for R.

(G) Effects of the Invention According to the present invention, the track width of a narrow track is processed during processing of a magnetic wafer, and both sides of the narrow track are filled and reinforced with a non-magnetic material such as glass in the post-processing process. However, it does not cause any deformation of the track width, and it is possible to make the track width considerably narrower. Further, since processing, bonding, and single-chip formation are performed so that a predetermined azimuth angle is created in the gap, a magnetic head that can be used in a VTR or the like can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a magnetic head manufactured by the method of the present invention. FIGS. 2, 3, and 4 are perspective views of conventional magnetic heads, respectively. FIGS. 5, 6, and 7 are diagrams showing the method of the present invention. ■... Metal magnetic wafer, (2)... Comb teeth part, ■...
・・First groove,■・・Second groove,---Narrow track part,
(To)...Non-magnetic material, ■...Magnetic block, -...
...Nonmagnetic substrate, ■...Third groove, ■...Front part, ■
...rear part, (to)...coil, (c)...combined object, (to)...! J4 groove, (to)... Recording medium contact surface, (θ)... Azimuth angle.

Claims (1)

[Claims] (1) Forming a first groove so that a plurality of comb teeth portions remain at predetermined intervals on one surface of a metal magnetic wafer, and performing narrow track width processing so that a plurality of narrow track portions remain on the other surface, A second groove formed between the narrow track portions is filled with a non-magnetic material such as glass, and then the magnetic wafer is sliced diagonally to reveal a predetermined azimuth angle to form a magnetic block. This magnetic block is bonded onto a non-magnetic substrate so that the portion having the narrow track portion is located at the end of the substrate, and then a third groove is formed from the portion having the narrow track portion of the block to the comb tooth portion. a front part and a rear part are provided, a coil is applied to the rear part to complete the first wafer, and then a second wafer processed and formed into a shape similar to the first wafer is bonded. forming a combined object, inserting a fourth groove from the front to the rear of the combined object to specify a recording medium contacting surface of each of the head chips, and dividing the plurality of comb tooth portions by the fourth groove; A method for manufacturing a magnetic head, which comprises slicing the combined product into head chip units.