JPH0449506A - Production of magnetic head core material body - Google Patents

Abstract

PURPOSE:To obtain a material body of high precision in an easy production process by simultaneously joining three parts of a magnetic body thin plate, a magnetic body bar, and a nonmagnetic body bar into one body by glass bonding. CONSTITUTION:Projecting stripes 12a and 12b of a magnetic body bar 12 are joined to one face of a magnetic body thin plate 11, and a nonmagnetic body bar 5 is joined to the other face. Bonding glass 13 and 14 are arranged in grooves part on the joint surface between the thin plate 11 and projecting stripes 12a and 12b, and bonding glass 16 is arranged in the grooved part formed by a notch 15a placed on the upper end of the junction part between the thin plate 11 and the bar 15. These glass 13, 14, and 16 are heated up to a prescribed temperature in a heating furnace and are fused to flow to the joint surfaces of respective parts. Then, three parts of the thin plate 11 and bars 12 and 15 are unified. Thus, the material body of high precision is inexpensively produced by the easy production method.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a method for manufacturing a core body (component at the manufacturing stage) of a laminated magnetic head used in a floppy disk device or the like.

(Prior art) A typical manufacturing method for this type of magnetic head core element is described in the second example.
Shown in the figure. In FIG. 2(A), 1 is a relatively thick rectangular magnetic material plate, and 2 is a prismatic magnetic material with a concave groove formed on one side and two protrusions 2a on both sides. It is a magnetic bar with a substantially U-shaped cross section, except for 2b. (A) In the process shown in the figure, the magnetic plate 1 is connected to the convex strip 2 a s of the magnetic bar 2.
Both are positioned in contact with the top surface of 2b, and they are integrated by glass bonding. 3.4 in the figure is a bonding glass for bonding the magnetic plate 1 and the magnetic bar 2 together. As shown in the figure, bonding glass is placed in the groove-shaped portion on the joint surfaces of both magnetic materials and melted in a heating furnace to firmly bond them together.

In the next step, as shown in Figure (B), the magnetic plate 1 is ground to reduce its thickness to a predetermined size.

In the next step, as shown in Figure (C), a prismatic non-magnetic bar 5 is bonded to the other surface of the magnetic plate 1 using a resin adhesive.

In the next step, as shown in Figure (D), the protruding stripes 2b of the magnetic bar 2 are removed by grinding, and grooves 58 are formed in the non-magnetic bar 5 by grinding.

In the next step, as shown in Figure (E), the core element shown in Figure (D) is sliced to a predetermined thickness to obtain one core element. Here, the joint portion of the protruding strip 2a between the magnetic plate 1 and the magnetic bar 2 becomes the gap G of the magnetic head.

(Problems to be Solved by the Invention) As described above, in the conventional manufacturing method, the relatively thick magnetic plate 1 and the magnetic bar 2 are integrated by glass bonding, and then the magnetic plate 1 is ground. Furthermore, the non-magnetic bar 5 is bonded to the magnetic plate 1 with a resin adhesive. In this method, the relatively thick magnetic plate 1 is initially used to prevent the magnetic plate 1 from bending during the process of glass bonding the magnetic bar 2, which has an approximately U-shaped cross section, and the magnetic plate 1. This is for the purpose of When the magnetic plate 1 is bent, the dimensional accuracy of the gap G deteriorates in some parts.

For this reason, the thick magnetic plate 1 is glass-bonded to the magnetic bar 2, and then the magnetic plate 1 is ground to make it thinner, but this complicates the process and also reduces the thickness of the magnetic material. It's a waste of money. Furthermore, since the non-magnetic bar 5 is bonded to the magnetic plate 1 in a separate process,
Furthermore, the manufacturing process becomes complicated.

As described above, the process in the conventional method is complicated, and this is reflected in the cost of the product. However, the dimensional accuracy of the magnetic gap in products has also become less high.

The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to make it possible to manufacture a magnetic head core element with higher precision through a simpler manufacturing process.

(Means for Solving the Problems) Therefore, the present invention provides a magnetic head core element in which a magnetic bar having a substantially U-shaped cross section is bonded to one side of a rectangular thin magnetic plate, and a non-magnetic bar is bonded to the other surface. In this method, three parts, the magnetic thin plate, the magnetic bar, and the non-magnetic bar, are bonded together by glass bonding at the same time.

(Function) With the thin magnetic plate sandwiched between the magnetic bar and the non-magnetic bar, these three parts are integrally joined by glass bonding in the same process.

(Example) FIG. 1 is a diagram showing the main points of a manufacturing method according to an example of the present invention. Reference numeral 11 denotes a magnetic thin plate, and its thickness is the same as the thickness of the magnetic plate 1 after the step shown in FIG. 2(B) in the conventional method. Reference numeral 12 denotes a magnetic bar having a substantially U-shaped cross section and having protrusions 12a and 12b, which is the same as the magnetic bar 2 in the conventional method (FIG. 2). Reference numeral 15 denotes a non-magnetic bar, which differs from the non-magnetic bar 5 in the conventional method (FIG. 2) in that a notch 15a is formed in one of its upper corners.

As shown in FIG. 1, the protrusions 12a and 12b of the magnetic bar 12 are bonded to one surface of the magnetic thin plate 11, and the non-magnetic bar 5 is bonded to the other surface.

And the protruding stripes 12a of the magnetic thin plate 11 and the magnetic bar 12,
Bonding glass 1 is placed in the upper groove-like part of the bonding surface with
3,] 4 are placed, and the bonding glass 16 is placed in the groove-shaped portion formed by the notch 15a located at the upper end of the joint between the magnetic thin plate 11 and the non-magnetic bar 15. This is heated to a predetermined temperature in a heating furnace, and bonding glass 1
3.14.16 is melted and the molten glass is poured onto the joint surfaces of each part. The three parts, the magnetic thin plate 11, the magnetic bar 12, and the non-magnetic bar 15 are now integrated.

This corresponds to the state shown in FIG. 2 (C) in the conventional method,
The subsequent steps are the same as before.

In the method of the present invention described above, the bonding glass 13
．． It is preferable to use a high melting point glass with a melting point of about 750° C. as the bonding glass 14, and use a low melting point glass with a melting point of about 500° C. as the bonding glass 16. In this way, in the same heating process, the bonding glass 16 is melted more fully, and the bonding glass 16 is well melted over a wide area of the bonding surface between the magnetic thin plate 11 and the non-magnetic bar 15.
can be spread widely. In addition, the magnetic thin plate 11
In order to spread the bonding glass 16 well between the bar 15 and the nonmagnetic bar 15, a minute spacer made of resin or the like may be interposed between the two.

(Effects of the Invention) As explained in detail above, in the method for manufacturing a magnetic head core element according to the present invention, the magnetic thin plate, the magnetic bar,
Since the three parts of the non-magnetic bar are joined together by glass bonding at the same time, the process is simpler than before and there is no waste of material to make the magnetic plate thinner. Further, since the thin magnetic plate is pressed and joined to the magnetic bar by the non-magnetic bar, almost no deflection of the thin magnetic plate occurs, and the dimensional accuracy of the magnetic gap is improved compared to the conventional method. In addition, the bonding strength between the magnetic thin plate and the non-magnetic bar is higher than that using conventional resin adhesives. In this way, a more accurate magnetic head core element can be manufactured at a lower cost using a manufacturing method that is simpler than the conventional method.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a core body in the manufacturing process showing the main points of the method for manufacturing a magnetic head core body according to the present invention, and FIG. 2 (A)
-(E) are perspective views showing a conventional manufacturing method. 1... Magnetic plate 2... Magnetic bar 2 a
l 2 b... Convex strip 3.4... Bonding glass 5... Non-magnetic bar 11... Magnetic thin plate 12... Magnetic bar 12a
, 12b... Convex strip 13.14... Bonding glass 15... Non-magnetic bar 15a... Notch 16... Bonding glass

Claims (1)

[Claims] A method for manufacturing a magnetic head core element in which a magnetic bar having a substantially U-shaped cross section is bonded to one side of a rectangular magnetic thin plate, and a non-magnetic bar is bonded to the other side, the method comprising: A method for manufacturing a magnetic head core element, characterized in that three parts, a body bar and a non-magnetic bar, are joined together by glass bonding at the same time.