JPS6342004A - Production of composite magnetic head - Google Patents

Abstract

PURPOSE:To prevent cracks and breaks of a magnetic body in apart near a gap and to improve the yield by preliminarily providing an aperture part, whose width is equal to or slightly wider than a prescribed groove width, in a second magnetic body joined to a first magnetic body. CONSTITUTION:A metallic magnetic film 3 is vapor-deposited on a face 15 on the gap facing side of a ferrite block 4 consisting of a high-permeability ferrite. Aperture parts 10 are formed in track width Tw prescribing grooving positions of the metallic magnetic film 3 so that track parts having width D1 (<= track width Tw) are left as they are, and then, the ferrite block 4 is partially exposed. A grooving wheel 7 is inserted from aperture parts 10 of the metallic magnetic film 3 to form track width Tw prescribing magnetic film 3 is not cut by the wheel at the time of grooving the ferrite block 4 and is surely prevented from being cracked and broken in track parts having a width D, especially, parts 3a near the gap to improve the yield.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a composite magnetic head having a magnetic core made of, for example, a high magnetic permeability ferrite and a magnetic metal material with a high saturation magnetic flux density. .

[Prior Art] Conventionally, as shown in FIG. 1, a composite magnetic head consists of a metal magnetic film (3) having a high saturation magnetic flux density, such as sendust or an amorphous alloy, and a metal magnetic film (3) made of, for example, M n -Z.
It is composed of a high magnetic permeability ferrite (2) such as n-ferrite. The process of groove machining such as track width regulation for this composite magnetic head is almost the same as the process for a magnetic head made only of high permeability ferrite. ) are simultaneously processed using mechanical methods. (For example, JP-A-58-
175122).

Hereinafter, the conventional groove machining process for regulating track width will be shown in 3rd IA.

First, in step (A), metal magnetic rIA (3) is vapor-deposited on the surface (15) on the gap abutting surface side of the ferrite block (4) made of high magnetic permeability ferrite (2), and in step (B)
), the track width TW is adjusted using the groove processing wheel (7).
After forming the regulating groove (5) to a depth that reaches the ferrite block (4), in step (C), the groove (5) is filled with a non-magnetic material (6) such as glass by a method such as molding. do.

After that, the winding & la groove (8) (
(see Fig. 1), and then abuts the other ferrite block (not shown) at the abutting surface (G) of the gear lubricant and adheres it by a method such as welding. The composite magnetic head shown in FIG. 1 can be obtained by cutting.

[Problems to be solved by the invention] In the conventional method of manufacturing a composite magnetic head as described above,
In the groove machining process to regulate track width, a metal magnetic film (3
) and high permeability ferrite (2) at the same time.
) to process grooves using high permeability ferrite (2)
When using a wheel (7) suitable for groove machining, mechanical matching between the metal magnetic film (3) and the wheel (7) cannot be achieved.
), cracks and chips occur in the vicinity of the gap (3a), etc., resulting in a problem of lower yield. In particular, 8
In the magnetic head for mmVTR, the track radiation Tw is 2.
Since the width was very narrow, about 6 pm, the occurrence of the cracks and chips mentioned above was serious.

The present invention was made to solve the above problems, and an object of the present invention is to provide a method for manufacturing a composite magnetic head that can eliminate cracks and chips in the magnetic material in the vicinity of the gap, thereby improving the yield. do.

[Means for Solving the Problems] A method for manufacturing a composite magnetic head according to the present invention includes a first magnetic material having high magnetic permeability, and a second magnetic material made of a metal having a higher saturation magnetic flux density than the first magnetic material. At the point where the first magnetic material is bonded and the second magnetic material is to be grooved, an opening with the same width or slightly wider than the radius of the groove is formed in advance by etching to partially form the first Gi magnetic material. Thereafter, a grooving wheel is inserted through the opening to form a groove of a predetermined width in the first magnetic body that is continuous with the opening.

[Function] According to the present invention, since the second magnetic body joined to the first magnetic body is provided with an opening that is the same width as the predetermined width of the groove or slightly wider than the predetermined width of the groove, it is possible to The second magnetic material is not scraped by the grooving wheel, so that
Cracks and chips in the second magnetic body near the gap are reliably prevented from occurring.

[Embodiments of the invention] Embodiments of the present invention will be described below with reference to the drawings.

In Figure 1, (la) and (lb) are core halves,
(2) is a high permeability ferrite which is the first magnetic material, (3
) is a metal magnetic film having a high saturation magnetic flux density, which is a second magnetic material, and is made of, for example, sendust or a Co-based amorphous alloy. (6) is the reinforced glass, (8) is the winding groove, and (9) is the gap.

Next, in the manufacturing process of the magnetic head, the process of forming grooves for regulating track width is shown in FIG.

First, in step (A), a metal magnetic film (3) is deposited on the surface (15) on the gap abutting surface side of the ferrite block (4) made of high magnetic permeability ferrite (3). Next, in step (B), the groove processing position for the track width Tw rule 1 of the metal magnetic film (3) is etched by a physical method such as ion beam etching, or by a chemical method using an anisotropic etching solution. By a conventional method, an opening (1O) is formed to partially expose the ferrite block (4) so that a track portion having a width Di (≦tran 2 width Tw) remains. Note that since it is generally desirable that the cross section of the opening (lO) be linear, the method of reducing the etching as described above is employed. After that, in step (C), a metal magnetic film (
A groove machining wheel (7) is inserted through the opening (10) of 3) to form a groove (5) for regulating the track width Tw in the ferrite block (4). At this time, the metal magnetic film (2
) is set to be less than or equal to the track width Tw as described above, so when the ferrite block (4) is being grooved, the metal magnetic film (2) is not aligned with the wheel (7).
), therefore, cracks and chips are reliably prevented from occurring in the track portion of the 1t@D in the metal magnetic film (3), especially in the gap vicinity portion (3a), and the yield is improved. achieved. Note that the wheel (7) used is one suitable for machining grooves in the ferrite block (4), such as a metal pound diamond wheel.

After that, in step CD), track radius Tw regulation groove (5
) is filled with reinforcing glass (6) by a method such as molding, the gap abutting surface (G) is polished as before,
Through various steps such as gap welding and cutting, the composite magnetic head shown in FIG. 1 is obtained.

In the above example, the ferrite block (4) and the total magnetism are +1! ;! Although the joint surface (11) with (3) was straight, it may have any shape such as a 7-shape or a U-shape.

In addition, although the above embodiment describes the groove machining process for regulating the track width, other groove machining, such as metal magnetic +1Q (3) on the ferrite block (4), to a depth that reaches the ferrite block (4) is also possible. Winding groove (8) (
(Fig. 1), or in which several layers including the metal magnetic film (3) are deposited on the ferrite block (4), use mechanical methods to create grooves, holes, etc. The present invention can also achieve similar effects in other cases.

[Effects of the Invention] As described above, according to the present invention, only the first magnetic body is grooved without cutting the second magnetic body with the wheel during groove machining for regulating track width, etc. Therefore, no cracking or chipping occurs in the second magnetic material in the vicinity of the gap, thereby improving the yield. Further, a wheel suitable for grooving the first magnetic material can be used, and there is an effect that there is no need to consider mechanical matching with the second magnetic material when selecting a wheel.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of a composite magnetic head according to an embodiment of the present invention, and FIGS. 2A to 2D are process diagrams showing the manufacturing process of the composite magnetic head of FIG. Figure 3 (A)
-(C) are process diagrams showing the manufacturing process of a conventional magnetic head. (la), (lb)...core half, (2)...
First magnetic body, (3)...Second magnetic body, (4)...
・Ferrite block, (5)... Groove for regulating track width, (7)... Wheel for groove machining, (lO)...
Aperture. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (2)

[Claims] (1) At least one of a pair of core halves formed by joining a first magnetic body with high magnetic permeability and a second magnetic body made of a metal with a higher saturation magnetic flux density than the first magnetic body, Manufacture of a composite magnetic head in which a groove of a predetermined width is machined to reach the first magnetic material, and then the pair of core halves are joined via a gap material with the second magnetic material facing each other. In the method, in the groove processing, an opening portion having the same width as the predetermined width of the groove or slightly wider is formed in advance at the position where the groove processing is to be performed in the second magnetic material by etching, and the first magnetic material is partially etched. and then inserting a groove machining wheel through the opening to form a groove of a predetermined width in the first magnetic body that extends to the opening. . (2) The method for manufacturing a composite magnetic head according to claim 1, wherein the groove is a track width regulating groove facing the gap abutting surface.