JPH05166126A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To secure an inside winding wire window having the some size as the wire diameter even if higher temperature causing the glass fill-up of the inside winding wire window to increase the adhesive strength of mating cores without hindrance to a coil winding and to increase the yield. CONSTITUTION:When a pair of the core half bodies 11 for gap formation are mated and the gap to be welded by a bonding glass is formed, a wire 9 is preliminarily inserted into an inside wiring groove 6 of the mated cores and is welded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a video tape recorder,
The present invention relates to a method of manufacturing a magnetic head used in a digital audio tape recorder or the like.

[0002]

2. Description of the Related Art With the recent increase in density of magnetic recording technology, a magnetic head is made of a soft magnetic metal having a high saturation magnetic density, such as a sendust alloy or an amorphous alloy, as shown in FIG. Head chip 25 having thin film 22 and non-magnetic substrate 21 supporting this soft magnetic thin film
Is used.

Since the magnetic head using the head chip 25 does not use ferrite which has been widely used in the past, there is an advantage that sliding noise hardly occurs when sliding with the magnetic tape.

[0004]

However, in the conventional magnetic head as described above, in order to improve the adhesion strength of the butted cores at the time of forming a gap (welding process) for heating and welding by the bonding glass, When the welding temperature is set to a high value, the glass flows into the inner winding groove (window) of the core, the inner winding window becomes small, and in some cases, the inner winding window is filled with the glass, resulting in coil winding. If the welding temperature is set lower, the filling of the inner winding window with glass is eliminated, but cracks may occur on the butt surfaces in the subsequent process due to poor adhesion of the butt surfaces. is there. Therefore, since there is a trade-off relationship between the filling of the inner winding window and the poor contact between the butted surfaces, there is a problem that the margin of the optimum welding condition is small and it is difficult to set the welding condition.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a method of forming a gap (welding process) in which a pair of core halves are butted and heated and welded with an adhesive glass.
This is a method of manufacturing a magnetic head in which wires are inserted in advance into the inner winding grooves of the butted cores and heat-welded.

[0006]

According to the above-mentioned method, even if a high welding temperature is set in the conventional method so that the inner winding window is filled with glass, the wire can be produced by the method of manufacturing the magnetic head according to the present invention. An internal winding window having a large diameter can be ensured, and the adhesion strength of the butted cores can be improved without hindering the coil winding, and the yield can be improved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the magnetic head manufacturing method of the present invention will be described below with reference to FIGS.

A magnetic head according to the method of manufacturing a magnetic head of the present invention uses a head chip 10 having a high saturation magnetic flux density as shown in FIG. 1, and the head chip 10 is composed of a pair of crystallized glass or ceramics. It has a non-magnetic substrate 1.

In the method of manufacturing a magnetic head according to the present invention, first, as shown in FIG. 2, a predetermined pitch dimension A is formed on the surface of the substrate 1.
To form a substantially V-shaped groove 5 continuously, and subsequently, as shown in FIG. 3, a predetermined film thickness (size corresponding to the track width) on one wall surface of each groove 5 by a vacuum deposition method or the like. And Fe-A
The 1-Si alloy 2 is formed.

Next, as shown in FIG. 4, after the groove 5 is filled with the low-melting glass 3, the low-melting glass 3 is placed so that the surface of the low-melting glass 3 and the apex of the substrate 1 coincide with each other as shown in FIG. Polish into a flat surface.

Next, as shown in FIG. 6, an inner winding groove 6 and an outer winding groove 7 are formed on both side surfaces of the substrate 1, and a gap surface which is a surface on which the glass filling groove 5 is formed. A non-magnetic gap material such as SiO _{2 is} formed by a sputtering method or the like so as to have a predetermined gap in 8 to form a core block half body 11.

After that, as shown in FIG. 7, the gap surfaces 8 of the pair of core block halves 11 are aligned and pressed so as to face each other. Then, the wire 9 is inserted into the inner winding groove 6 of the butted core, and heat welding is performed. After the welding, the inserted wire is extracted, and the joined core block is cut along a chain double-dashed line at a predetermined pitch dimension B to obtain the head chip 10 shown in FIG. Then, after the head chip 10 is adhesively fixed to a base plate (not shown), coil winding and tape polishing are performed to complete the magnetic head.

In the case of a commonly used piano wire, the type of the wire to be inserted is such that the wire and the low melting point glass are joined together during welding, and the inserted wire may not be able to be removed after the welding. The core block is cut as it is to make a head chip. After that, the wire buried in the internal winding window is pierced and removed with tweezers or the like.

On the other hand, when brass-plated piano wire is used as the wire, glass containing SiO ₂ and PbO as main components (specifically, SiO ₂ 32 to 44.3 wt%, PbO and PbO).
30-42.4 wt%, Na ₂ O 10-12.4 wt
%, K ₂ O 4.8 to 8.6 wt%, Al ₂ O ₃ 1.5 to
3,4 wt%, BaO 1.0-2.5 wt%, CaO
1.5 to 3.0 wt%) and glass containing Tl ₂ O ₃ and PbO as main components (specifically, SiO ₂ 6.2 to 8.8 wt)
%, PbO 50.3 to 62.7 wt%, ZrO ₂ 0.8
_{~2.4wt%, B 2 O 3 3.2~5.5wt} %, Tl 2
O ₃ 18.5 to 23.8 wt%, SrO 0.5 to 2.0
wt%, ZnO 0.8 to 2.1 wt%, Al ₂ O ₃ 1.6
(About 4.0 wt%), it is possible to pull out the inserted wire securely without the wire and the low melting point glass being joined at the time of welding.

It is the familiarity between metal and glass (wettability).
However, brass and glass are particularly bad, so if brass is selected as the wire material, it can be best applied to low-melting glass that is generally used for welding, and securely removes the inserted wire after welding. be able to.

[0016]

As described above, according to the method of manufacturing a magnetic head of the present invention, in the welding step, a wire is previously inserted into the inner winding groove of the butted cores and heat welding is performed.
Even if a high welding temperature is set so that the inner winding window is filled with glass, it is possible to secure the inner winding window having the wire diameter size, and therefore the coil winding is not hindered. Further, the adhesion strength of the butted cores can be improved, and the yield can be improved.

If brass is selected as the wire material,
After welding, the wire can be reliably removed and workability can be further improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a head chip manufactured by a method of manufacturing a magnetic head according to the present invention.

FIG. 2 is a perspective view showing a state in which a groove is continuously formed in a substrate by the magnetic head manufacturing method of the present invention.

FIG. 3 is a perspective view showing a state in which a predetermined film thickness is formed on each groove wall surface by the magnetic head manufacturing method of the present invention.

FIG. 4 is a perspective view showing a state in which each groove is filled with a low melting point glass by the method for manufacturing a magnetic head of the present invention.

FIG. 5 is a perspective view showing a state in which a low melting point glass is planarly polished by the method for manufacturing a magnetic head of the present invention.

FIG. 6 is a perspective view of a core block half body formed by the method for manufacturing a magnetic head of the present invention.

FIG. 7 is a perspective view of a core block formed by the method of manufacturing a magnetic head of the present invention.

FIG. 8 is a perspective view of a head chip used in a conventional magnetic head.

[Explanation of symbols]

 6 Internal winding groove 9 Wire 10 Head chip 11 Core block half

Claims (2)

[Claims] 1. When a pair of core halves for gap formation are butted against each other and heat-welded with an adhesive glass, when forming the gap, a wire is inserted into the internal winding groove of the butted cores in advance and heat-welded. A method for manufacturing a characteristic magnetic head. 2. The method of manufacturing a magnetic head according to claim 1, wherein the material of the wire to be inserted is brass or brass plating.