JPS60197913A - Magnetic head and its manufacture - Google Patents

Abstract

PURPOSE:To obtain a magnetic head constituted so that a joining force of a core half body is strong, and also a gap interval has a high accuarcy, by providing a transition metallic layer on each opposed contact face of a wafer consisting of a pair of alloy magnetic materials, inserting a glass rod into a groove formed on one wafer, pressing and welding it. CONSTITUTION:Grooves 12, 13 and a winding groove 14 for welding are provided on one 11 of a pair of alloy magnetic materials, for instance, sendust wafers, and a transition metallic layer 15 of Ti, etc. is formed on the surface having the grooves 12-14 by an ion plating method. The same transition metallic layer 15 is formed on the opposed contact face of the other wafer 16, too, and thereafter, both the wafers are butted and an SiO2 film 17 for determining a gap lengh 25 is provided on a corner part 18. Subsequently, the wafers 11, 16 are butted, and welded by inserting a lead phosphoric acid compound or barium phosphoric acid compound glass rod 19 into the grooves 12-14 and adding a weight F as indicated with an arrow. In this way, the material of the glass rod 19 permeates into the layer 15, and a strongly joined core block is obtained. The block is cut and divided into each main core chip, a necessary working is performed, and a magnetic head having a high gap accuracy is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a magnetic head used in a VTR or the like and a method of manufacturing the same.

(b) Prior Art A magnetic head whose main core is made of an alloy magnetic material such as Sendust is described in Japanese Patent Laid-Open No. 58-222427.

The conventional method for forming the main core in such a magnetic head is to use a pair of Sendust wafers [111
21 (1) has a welding hole [31141 and a winding hole (5
) were created by machining, and the gap forming surfaces of these wafers fl)i21 were mirror-finished, then they were butted together, glass rods (6) were inserted into grooves (3) +41 +51, and a load was applied. By welding the glass rod (6) in the state shown in FIGS. 2 and 6, a 4C wafer +1
It has a step of infiltrating the opposing surface of 1121 with glass to form a core block. A gap (8) of about 0.2 μm will be formed in the completed core block by the separately applied 810 and 171 (see Figure 3), but the glass (6) should fully penetrate into the gap. Because the wafer (11121) is not bonded, it is only partially bonded. Therefore, the mechanical strength is weak and when slicing is performed as shown in (9) in Fig. 4 and the main core chip is made as shown in Fig. 5, some parts are bonded in the gap. As shown in Figure @6, the welded glass (6) broke and the gap (8) was 2 μm.
) spreads to about 5 μm. In addition, since the glass 16) does not fully penetrate into the gap during welding, only a slight cavity occurs in the groove (5), so it takes time to form the winding hole in the groove (5). There were drawbacks. Furthermore, when a predetermined gap length (track width) is formed by polishing, since the track width of a video head is extremely small, if the bonding force between the half cores is weak, there is a risk of warping or separation. In addition, the magnetic head formed using the above-mentioned conventional method has problems in terms of reliability, such as weak bonding force at the abutting surfaces of the two half-core cores, which changes the gap distance and deteriorates the reproduction output. .

(c) Purpose of the Invention Therefore, it is an object of the present invention to provide a magnetic head in which the bonding force between the pair of core halves forming the main core is strong, and a method for manufacturing the same.

B) Structure of the Invention The magnetic head of the present invention has a main core in which an operating gap made of a glass material is formed on the abutting surface of the core half-hole made of an alloy magnetic material. The method of manufacturing a magnetic head according to the present invention is characterized in that a transition metal layer is provided, and the method for manufacturing a magnetic head according to the present invention includes providing a plurality of grooves in one of a pair of wafers made of a synthetic magnetic material, and forming grooves in each pair of the wafers. A transition metal layer is provided on the contact surface by an ion blating method, the pair of wafers are brought into contact with each other and held under pressure, and a glass rod is inserted into the notch and the glass rod is welded. % between the transition metal layers on the opposing surfaces, and then slicing and polishing are performed to create the main core.

(e) Example As shown in FIG. 7, a welding groove T12 (1 m) and a winding groove I are provided on one of the sendust wafers U11 to be matched, and then a groove I for winding is provided on the wafer (2) as shown in FIG. Titanium (T
1) A transition metal layer (or layers) is formed by a well-known ion blasting method. Note that chromium, molybdenum, or tungsten may be used instead of titanium. Such a transition metal layer (15+ is the wafer (111) as shown in FIG.
It is also provided on the opposing surface of the other Sendust wafer that is butted against the other Sendust wafer. A 5103 film 111 is provided on one or both of the wafers 111αυ at the corner a for determining the gap length (c) when they are butted. As shown in Figure 9, both wafers (In(lG) are abutted and
The glass rod (11) placed in the groove (113) (141) was heated to a high temperature (in a vacuum) as shown in Figure 10 with a load (0 applied).
As shown in FIG. 11, the glass α-' easily penetrates between the transition metal layers formed on the abutting surfaces of the UNINO %TTNAE. This is thought to be because glass is poorly compatible with metals and alloys and does not extend over them, but is easily compatible with transition metals and easily extends over them. It should be noted that lead phosphate glass or barium 11 phosphate glass, which has a coefficient of linear expansion similar to that of Sendust, is suitable as the glass .alpha.'.

When the glass (11') sufficiently penetrates into the abutting surfaces in this way, a large cavity ■ whose cross section is close to a perfect circle is formed in the groove αzutt41. Therefore, in the groove Q41 for winding, this The cavity can be used as a winding hole, which is advantageous in manufacturing operations.Next, the block formed by joining in this way is sliced into main core chips in the same manner as before, and each main core chip has the desired shape. The main core is completed by polishing the 12th
As shown in FIG.
They are joined so as to be sandwiched by D and formed into a sandwich shape. After that, a coil is wound as shown in FIG. 12 to complete the magnetic head.

(f) Effects of the Invention As described above, according to the magnetic head of the present invention, the bonding force between the core halves forming the main core is strong, resulting in mechanical stability and improved electrical reproduction characteristics. effective.

In addition, in the manufacturing method of the present invention, the bonding force is strong because the welded glass sufficiently penetrates between the transition metal layers provided on the abutting surfaces of the two wafers, and the gap length does not change during slicing or polishing. There is no possibility of leaving or leaving.

Therefore, it exhibits reliability especially in polishing when producing a small track width such as a video head. Furthermore, once the glass has sufficiently penetrated between the transition metal layers, a large cavity is formed in the glass in the groove, and this cavity can be used as a winding hole.

[Brief explanation of drawings]

1 and 2 are diagrams for explaining a conventional magnetic head and its manufacturing method, and FIG. 3 is an enlarged view of a part of FIG. 2. 4 and 5 are diagrams for explaining a conventional magnetic head and its manufacturing method, and FIG. 6 is a partially enlarged diagram. Figure 7, Figure 8,
9 and 10 are diagrams for explaining the magnetic head of the present invention and its manufacturing method, and FIG. 11 is an enlarged view of the main part of FIG. 10. FIG. 12 is a plan view of the magnetic head of the present invention, and FIG. 13 is a side view thereof. (111(I!-...wafer, a3+13ta41...
・Groove, a9...Transition metal layer, (19...Glass rod,
(11'...Glass. Applicant Sanyo Electric Co., Ltd. Agent Patent Attorney Shizuo Sano Figure 2 Figure 4 Figure 10 Figure 11 Figure 12 Figure 13 n Procedural Amendment (Spontaneous) 1982 May 4th 1, Display of the case Patent Application No. 52722 of 1988 2, Name of the invention Magnetic head and its manufacturing method 6, Person making the amendment Relationship to the case Name of the patent applicant (188) Sanyo Electric Co., Ltd. 4 , the agent address 2-18 Keihan Hondori, Moriguchi City is corrected to "0.2 μm".

Claims (1)

Scope of Claims: (1) A magnetic head having a main core in which an operating gap made of a glass material is formed on the abutting surface of the core half-hole made of an alloy magnetic material, wherein a transition metal is inserted between the glass material and the core half-hole. A magnetic head characterized by being provided with a layer. (2) The magnetic head according to claim 1, wherein the alloy material is Sendust. (3) The magnetic head according to claim 2, wherein the transition metal layer is a titanium film. (4) The magnetic head according to claim 3, wherein the glass material is lead-phosphate glass. 15+ The magnetic chamber according to claim 5, wherein the glass material is barium phosphate glass. . (6) A plurality of grooves are provided in one of a pair of wafers made of a synthetic magnetic material, and a transition metal layer is provided on the facing surface of each of the wafers by an ion blating method, so that the pair of wafers are brought into contact with each other. While pressurizing and holding, inserting a glass rod into the groove and welding the glass rod, glass is infiltrated between the transition metal layers on the facing surface of each sea urchin 11, and then slicing and polishing are performed. A method of manufacturing a magnetic head, characterized in that a main core is created using a method of manufacturing a magnetic head.