JPH03241508A - Manufacture of multi-track magnetic head - Google Patents

Abstract

PURPOSE:To easily manufacture a multi-track magnetic head by separately and integrally forming a front core part having a magnetic gap and a back core part having a coil and connecting them. CONSTITUTION:Cores for the number of prescribed tracks are segmented from a core block where multiple cores are previously provided in parallel and the multi-front core part 1 having the magnetic gap is formed. Apart from it, the back core part 2 having the coil is integrally formed and the multi-front core part 1 and the back core part 2 are connected so that respective front cores 10 and the back cores 20 correspond. Thus, the cores of the desired multi-track magnetic head can be obtained. Since the front core part 1 is integrally segmented from the core block, the gap positions and gap depths in respective cores come equal and the precision of a track pitch can be set satisfactory.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multi-track magnetic head, and more particularly to an improvement in the manufacturing method of the multi-core.

[Prior Art] A conventional multi-track magnetic head will be explained based on FIGS. 4 and 5.

The magnetic head having two front cores 40 shown in FIG. 4 is a two-field video floppy head. As shown in the figure, since a back core 44 with a winding 43 is bonded to the side surface of a front core 40 having a magnetic gap, assembly is easy even if the pitch between the cores becomes narrow, but Core multiplication is not possible. In addition, 41 in the figure is a bonded glass, and 42 is a shield.

The multi-track magnetic head shown in FIG. 5 has a structure in which one core chip 50 is joined in the track width direction via a spacer 51, a shield 52, and a spacer 51.
When assembling this, high component precision is required to accurately determine the track pitch (core pitch). Furthermore, in order to align the gap (trunk) position and gap depth of each core chip 50, high assembly accuracy is required, making manufacturing difficult. In addition, 53 in the figure is a winding wire, and 54 is a bonded glass.

[Problems to be Solved by the Invention] This invention solves the difficulty of assembling the multi-cores that the conventional multi-track magnetic head has, and provides a multi-track magnetic head that is easy to assemble and has uniform gap positions, gap depths, etc. The purpose is to provide a manufacturing method for.

[Means for Solving the Problems] In order to solve the above-mentioned problems, in the present invention, a front core part having a magnetic gap and a back core part having a winding are formed separately and integrally, and then, These are joined together to manufacture a multi-track magnetic head core. Furthermore, since the front core section is cut out as one piece from the core block, it is possible to create multi-cores with the same gap position and gap depth for each core.

Furthermore, by inserting the track grooves that define the track width and track pitch after the core blocks are joined, the track alignment work that was done when joining conventional core half blocks can be omitted, and the causes of error in track-related dimensions can be reduced by grooves. By using only the processing accuracy of the insert processing machine, it is possible to easily obtain multi-cores with high dimensional accuracy in track width and track pitch.

Embodiment FIG. 1 shows a method of manufacturing a multi-core of a multi-track magnetic head according to an embodiment of the present invention.

As shown in FIG. 1, the multi-core is broadly divided into two parts: a multi-front core section 1 and a multi-bank core section 2. A method for manufacturing the multi-front core section 1 is shown in FIG. 2, and a method for manufacturing the multi-back core section 2 is shown in FIG. 3, respectively.

The manufacturing method of the multi-front core part 1 is shown in FIGS.
The steps in f) are described below.

FIG. 2(a): After processing a groove for the bonding glass 14 in the unprocessed core half block 10a, it is filled with the bonding glass 14, and then a winding groove is inserted.

FIG. 2(b): The core half blocks 10a are joined to produce a core block 10b.

FIG. 2(C): A track groove is formed in the core block 10b, and the front shield 12 is placed in the track groove.

Fig. 2(d) Place the filled glass slab 1 a on the Nidrank groove.

FIG. 2(e): The glass 11 is heated and filled into the track groove.

FIG. 2(f): Core block 10b in FIG. 2(e)
A multi-front core 1 is obtained by cutting out the broken line portion.

As a modification of this manufacturing method, there is a method in which a groove for the bonding glass 14 is not processed, and a thin bonding glass 14 is placed on the entire surface of the abutting surfaces of the core half blocks 10a as a gap length regulating material and bonding is performed.

The manufacturing method of the multi-back core part 2 is shown in FIGS. 3(a) to (e).
) is explained below according to the steps.

Figure 3 (a): U-shaped bank core 20 and spacer 2
Prepare 1.

Figure 3(b) Bank core 2 between the two varnish spacers 21
0 and laminated and bonded. At this time, the U-shaped openings are staggered.

FIG. 3(C) A winding 23 is attached to the two-bank core 20.

FIG. 3(d): The back core 20 is laminated and bonded with a predetermined number of bag portion shields 22 sandwiched therebetween.

FIG. 3(e): The abutting surface with the multi-front core 1 is polished (or ground) to ensure that each front core 10 and back core 20 are in contact with each other.

Note that the filling glass 11 can be replaced with a nonmagnetic material formed by sintering, reaction hardening, or other methods, as long as it can be filled into the track groove and there is no problem in sliding with the magnetic recording medium. An example thereof is a laminated film of SiO2 or other non-magnetic ceramics formed by sputtering.

If the thus manufactured multi-front core section and the multi-bank core section 2 are joined so that each front core lO and back core 20 correspond to each other as shown in FIG. 1, the desired multi-track magnetic You can get the core of the head.

[Effects of the Invention] As explained above, in the present invention, the multi-core of a multi-track magnetic head is manufactured by dividing it into a multi-front core portion having a magnetic gap and a multi-bank core portion having a winding. Therefore, a multi-track magnetic head with a large number of tracks can be easily obtained, and the core can be easily handled as a semi-finished product during the manufacturing process.

In addition, since the multi-front core is made by cutting out a predetermined number of fronts from the core block, the accuracy of the track pitch can be improved. By simultaneously machining track grooves and filling the track grooves with glass after joining the core half blocks, a multi-core with uniform gap position and gap depth and high accuracy in track pitch and track width can be obtained.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of a multi-core of a multi-track magnetic head manufactured according to the present invention, and FIG.
2(b) is an exploded perspective view showing the front core part and back core part, and FIGS.
f) is a diagram showing the manufacturing process of the multi-front core part, 3rd
The figure shows the manufacturing process of the multi-back core part. Figure 4 shows the conventional back core type two-track magnetic held core. Figure (a) is its perspective view. Figure (b) is its exploded perspective view. FIG. 5 shows another conventional example of a multi-track magnetic head core with a one-piece core chip, of which FIG. 5(a) is a perspective view and FIG. 5(b) is an exploded perspective view. 1... Multi-front core section, 2... Multi-back core section, 10a... Core half block, 10
b... Core block, 11... Filled glass, 13... Magnetic gap, 23... Winding wire. Figure 1 (b) Figure 3 Figure 4 Figure 5

Claims (3)

[Claims] (1) A method for manufacturing a multi-track magnetic head in which a plurality of cores are arranged in parallel in the track width direction and a magnetic gap corresponding to each track is formed in each core, the multi-front core portion having the magnetic gap. and a multi-back core portion having windings corresponding to each core are separately formed integrally, and then the multi-front core portion and the multi-back core portion are joined. manufacturing method. (2) Manufacturing the multi-track magnetic head according to claim 1, wherein the multi-front core section is formed by cutting out a predetermined number of tracks from a core block in which a large number of cores are arranged in parallel in advance. Method. (3) The core block is formed by joining a core half block containing one magnetic pole of a magnetic gap to a core half block containing the other magnetic pole, and providing track grooves in this joined body for regulating track width and track pitch. 3. The method of manufacturing a multi-track magnetic head according to claim 2, wherein the track grooves are formed to a depth greater than the thickness of the front core portion, and the track grooves are filled with a shielding material and glass.