JPS63103407A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To prevent accident such as the clogging of a mold member in the outer groove or the window of a core from being generated, by covering a winding connecting outer groove and a winding communicating window on which no molding member should be attached in advance, with a bar block, and attaching base substance having good conformability to the mold member on a part to be molded. CONSTITUTION:At the time of performing the butt junction of a ferromagnetic core by using a bonding agent and the mold member 40, the winding connecting outer grooves 27 and 30, and winding communicating window 24 on which no mold member 40 should be attached in advance, are covered with the cover blocks 37 and 38, and also, the base substance 39 having the good conformability to the mold member 40 is attached on the part to be molded by sputtering, etc. Thus, since core blocks 20 and 21 are covered and enclosed with the cover blocks 37 and 38, and the base substance 39 are attached, the mold member 40 are collected at the part to be molded appropriately, and the invasion of the mold member to the outer grooves 27 and 30, or the window 24 of the core can be prevented from occurring, and also, the cover blocks 37 and 38 can be used also as the sandwiching jig of the core.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to the formation of a bond for a core for a magnetic head that performs magnetic recording, and is a technique that can be used for bonding chips of electronic devices and the like.

2. Description of the Related Art Currently, many magnetic heads for magnetic recording in VTRs, computers, etc. still employ ring-shaped cores. The core for this magnetic head requires a soft magnetic material that exhibits high magnetic permeability, high saturation magnetic flux density, and resistive magnetic properties.Moreover, the magnetic gap provided in a part of the core is a material that has recently been developed to increase recording density. It is necessary to select a material that has a diameter of 1 μm or less and has good abrasion resistance to withstand sliding with the magnetic recording medium, as desired. Therefore, Mn-Zn single crystal ferrite, sendust alloy, etc. are used.

By the way, in order to manufacture a magnetic rad core for a VTR,
As shown in the figure, a pair of core blocks 1 and 2 are prepared, abutted against each other, and the upper corners 3 and 4 on the joining surface side are made thin so as to have a track width t as shown in FIG.
In order to form a gap of about 1 μm or less when butting, one of the core blocks is ground, and one of the core blocks 1
After the core is manufactured, a notch 5 is provided to create a through window through which the coil winding is inserted, and a low melting point glass 9, for example, is adhered to the gap g and the butt portion 7.8 as an adhesive, as shown in FIG. I got a core 10 like this. 8+ again
In the case of the sendust alloy core, which is highly prized in uiVTRs, etc., the core adhesion is insufficient with only low melting point glass, so the glass is used as a protective plate 3' to guard the magnetic gap g, as shown in item 11. , 4'', and the core blocks 1' and 2' are bonded with A near the back gap.
It's by gro11. At this time, the glass is kept;! W3'
, 4'', as shown in FIG. 12, the convex tooth portions 12, 12, . The concave portions 13.13. are formed at pitch intervals between the convex tooth portions.
...Hemold glass piece 14 is heated and melted to be molded.

The problem to be solved by the present invention is that during welding, the coil windings may inconveniently adhere to the inner surface of the coil winding insertion window 15, making subsequent winding insertion work difficult. As a means to solve this problem, the present applicant has previously disclosed in Japanese Patent Application Laid-Open No. 110306/1987 that a wire rod made of a material that is not compatible with adhesive glass is inserted into the winding insertion window of the core, and after bonding. , suggested pulling out the wire.

However, in the case of the aforementioned Sendust alloy core, the above suggestions are still insufficient. That is, as shown in FIG. 13, when the molding glass piece I4 is melted, it may flow out into the winding locking outer structure 16, 17. Then, the disadvantage arises that winding the wire becomes difficult. Moreover, if the windings further overflow from the outer winding locking grooves 16 and 17, they will unnecessarily adhere to the core block holding jig (not shown), causing a problem that will interfere with subsequent core polishing and slicing operations. .

This invention is proposed for the purpose of alleviating the above-mentioned problems.

Means for Solving the Problems This invention provides a method for butt-joining ferromagnetic cores using an adhesive and a mold member, by forming a winding locking outer groove and a winding insertion groove onto which the mold member should not be attached in advance. According to the present invention, the core block is covered and surrounded by the cover blocks. Since the base material is adhered to the mold member, the mold member is preferably collected in the mold portion and does not enter the outer groove or window of the core. Further, in this invention, the cover block can also be used as a jig for clamping the core.

Embodiment FIGS. 1 to 6 are perspective views or front views of a core block for explaining an embodiment of the present invention.

First, prepare Sendust core blocks 20 and 21 for a large number of cores in the conventional manner, and place an S10 film 23, which will serve as a gap spacer, adjacent to the 510° film 23 at one end along the longitudinal direction of the joint surface 22 of the core block 20. A large chamfered slope 25 is formed at the boat-shaped notch 24 for winding insertion and at the other end where no gap is formed, and an Au layer 26 having good compatibility with Ag solder is formed. Further, a winding locking outer structure 27 is provided on the outer surface opposite to the joint surface 22. On the other hand, in the summer of the core block 2, an Au layer 28 similar to that of the core block 20 was applied to the bonding surface 2.
A winding locking outer groove 30 is also provided at the other end of the wire.

Next, as shown in FIG. 2, the bonding surfaces 22.29 of the core blocks 20 and 21 are brought into opposing contact with each other, and the Ag braze 31 serving as an adhesive is inserted into the triangular prism-shaped space between each Au layer 26.28. Then, the core blocks 20 and 21 are heated and melted to complete a core block assembly 32 in which the core blocks 20 and 21 are integrated.

Thereafter, as shown in FIG. 3, on the top of the core block assembly 32 where the magnetic gap 33 is formed, a convex tooth portion 34.34 having a track width dimension t is attached at right angles to the magnetic gap, that is, in the transverse direction. Concave groove 35.35 so as to leave ...
．． ... is formed by cutting.

Then, as shown in FIG. 4, a carbon zelkova 36, which has low compatibility with the molded glass (described later), is inserted into the winding insertion window 24, and a side cover flock 37 shown in broken lines is inserted.
38 to cover the outer structure 27 and 30 and sandwich the core block assembly 32. Next, the sandwiched whole is placed in a vacuum atmosphere, and as shown in FIG.
Alternatively, a Cu coating 3B is deposited by sputtering.

In this case, the base layer 39 is not formed on the inner wall surfaces of the cover blocks 37 and 38, but carbon or Cu is suitable as the material for the sake of the glass mold described later.

Thereafter, as shown in FIG. 6, a piece of mold glass 40 is placed on top of the top part while being surrounded by cover blocks 37 and 38, and is heated and melted to form a glass mold.

In the above embodiment, the cover blocks were sandwiched from both sides of the core block assembly, but in the present invention, as shown in FIG. 7, for example, a cup-shaped block 41 is fitted into the joint. You can.

Effects of the Invention By carrying out the present invention, it is possible to prevent the mold member from clogging the outer groove or window of the core, thereby significantly facilitating the winding work around the core and contributing to the automation of the winding work. Further, in the present invention, the cover block can be used as a jig for clamping the core block even during the molding operation of the mold member, which is also useful for improving the workability of the molding operation.

[Brief explanation of the drawing]

1 to 8 are perspective views or front views of a core block for explaining one embodiment of the present invention, and FIG. 7 is a front view of a core block showing another embodiment. 8th to 10th
The figure is a front view or plan view of a core block of a conventional VTR head. Fig. 11 is a perspective view of a general Sendust core, Fig. 12 is a perspective view of a general Sendust core;
Figures 1 and 13 are perspective views of the core block before and after the glass mold. 20.21...Core block, 24...Winding insertion window (notch), 27.30...Outer groove, 36...Carbon keyaki, 37.38.41...Cover block, 39. ... Base layer, 40 ... Mold member (glass piece).

Claims (1)

[Claims] When butt-joining ferromagnetic cores using an adhesive and a mold member, the winding locking outer groove and the winding insertion window to which the mold member should not be attached should be covered with a cover block in advance, and the mold part A method of manufacturing a magnetic head, comprising: attaching a base material that is compatible with the mold member.