JPS6040519A - Magnetic head and its production - Google Patents

Abstract

PURPOSE:To obtain a magnetic head of high accuracy which is suitable for use for a floppy disk by bonding magnetic cores for record/reproduction and erasion to the surface of a plate-shaped block member which is obtained by butting a magnetic gap for erasion adjacent to a magnetic gap for record/reproduction. CONSTITUTION:Grooves 92 and 92' are formed to the counter faces of nonmagnetic material blocks 91 and 91', and erasion head magnetic materials 52 and 52' having width smaller than the depth of grooves 92 and 92' are fitted into these grooves. While two ferrite thin plates 11 and 11' are butted to each other to obtain a composite plate having a magnetic gap 21. Then blocks 91 and 91' are bonded to both sides of the composite plate so that the gap 21 is positioned at the center between the materials 52 and 52'. These blocks are cut into plural slices as shown by botted lines, and magnetic thin film layers 14 and 14' are formed at both sides of materials 52 and 52' respectively. Thus a slider 9 for floppy disk is obtained. Then magnetic cores 12 and 13 for recording/reproduction and erasion are bonded to the surface of the slider 9. Thus a magnetic head having a high-accuracy gap is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head for recording and reproducing digital signals on a magnetic medium, such as in a floppy disk device, and a method for manufacturing the same.

A magnetic head for a floppy disk drive consists of a 1-channel erase head, which has erasing heads with magnetic gaps in the same direction as the recording/reproducing head on both sides of the recording/reproducing head. There is a straddle erase head that uses a gap between an erasing magnetic pole and a recording/reproducing core that are arranged at a distance as a magnetic gap for erasing.

As shown in FIG. 1, a conventional straddle erase head forms a magnetic gap 21 between a magnetic core 1 and a magnetic core 2 around which a recording/reproducing coil 4 is wound, and closes the magnetic gap with another magnetic core 3. A recording/reproducing head is constructed as a path. In addition, the magnetic yoke 6 around which the erasing coil 7 is wound and has bent portions 8, 8' at its tip, and the erasing magnetic cores 5, 5' embedded in the slider 9 are connected to the bent portion 8.
, 8' form a closed magnetic path, forming an erasing circuit.

These magnetic cores include a magnetic core 1 that forms a magnetic gap 21 for recording and reproducing on the sliding surface of the magnetic medium, as shown in FIG.
2 is supported by a slider 9 made of a non-magnetic material. In addition, the magnetic pole parts 5], 5]' of the magnetic yoke 6 of the erase head embedded in the slider 9 are inserted through the sliding surface, and the magnetic pole parts 51 and 51' and the magnetic cores 1, 2 for recording and reproduction are inserted. A magnetic gap for erasing is formed between the two.

This type of magnetic head has a high-density recording magnetic gap f21 of 2 μm or less, and an erase gap of 20 μm.
Narrow around m, f. The overall dimensions are approximately 6 x 6 in both height and width, and the magnetic cores 1, 2, 3, 5.5', core members such as the magnetic yoke 6, slider 9, and other components are tall. Requires precision processing. In addition, these parts are generally bonded using low-melting point glass or special resin.
Another disadvantage is that the assembly process is complicated and the assembly process requires a lot of man-hours, as an extremely narrow magnetic gap is formed using highly precise parts. Furthermore, it is difficult to obtain a large quantity of magnetic heads with uniform characteristics, and there is a drawback that the characteristics vary widely and lack reliability.

The purpose of the present invention is to eliminate such drawbacks of the conventional method, process the magnetic gap part that requires processing precision using a block, cut this block into thin pieces and use it as the slider surface in contact with the magnetic medium, and facilitate the processing and assembly of the magnetic head. This is to ensure uniformity and high reliability.

The present invention provides a magnetic head in which a magnetic core of an erasing head is disposed on both sides of a magnetic core of a recording/reproducing head. Two plates each having a magnetic material for forming an erasing magnetic gap fitted into a groove cut into one side of a non-magnetic plate are placed adjacent to the recording/reproducing magnetic gag on both sides. A plate-shaped block member which is butt-jointed so that a magnetic material for forming a magnetic gap is located, and is formed on one surface of the plate-shaped block member so as to extend in opposite directions from both sides of the magnetic materials. a plate-shaped block member having a magnetic film layer, and a recording/reproducing magnet on the one surface of the plate-shaped block member, the two magnetic thin plates and the (5) magnetic thin film layer in contact with each other. Furthermore,
The present invention is a method for manufacturing a magnetic head in which a magnetic core of an erasing head is disposed on both sides of a magnetic core of a recording/reproducing head, in which a composite plate-like body is formed by butting two thin plates of magnetic material. f. Two blocks are formed in which a magnetic material is fitted into grooves carved in opposing surfaces of two block-shaped non-magnetic materials, and the abutting portion and the The two blocks are joined by aligning the centers of the magnetic materials of the two blocks, and the joined body is cut into a plurality of slices in a direction perpendicular to the magnetic material, and on one surface of the slices. A magnetic thin film layer is formed on both sides of the magnetic material so as to extend in opposite directions, and a magnetic core for recording and reproducing and a magnetic core for erasing are placed on the one surface of the sliced piece of the composite plate. A method of manufacturing a magnetic head is provided, characterized in that the magnetic head is brought into contact with an exposed surface and an exposed surface of the magnetic thin film layer, respectively.

(6) According to the present invention, the sliding portion having the magnetic gap and the magnetic core portion of the magnetic head are formed separately and assembled later.
Therefore, the precision of the magnetic gap can be increased, and a magnetic head with small variations in characteristics can be easily obtained.

Embodiments of the present invention will be described below with reference to the drawings.

With reference to FIG.
2.92', and in this groove 92.92', a magnetic material 5 as an erase head magnetic pole material having a thickness smaller than the depth of the groove 92.92' is formed.
2. Insert 52'. ! The two thin ferrite plates 11.11"t and 11.11"t are butted against each other with their end faces to form a composite plate having magnetic gaps f21f and r.The magnetic gaps f21 are then placed on both sides of the composite plate 91.
．． Blocks 91 and 91' are brought into contact with each other so as to be in the center of the magnetic material 52 and 52' of 91' and bonded with glass or special resin to obtain a block member as shown in FIG.

Next, process the outer periphery of the block member shown in Figure 4.

As shown by dotted lines, a multi-wire saw or the like is used to cut into a plurality of slices, and on one surface of each slice, magnetic thin film layers 14. 14'.

A slider 9 as shown in FIG. 5 is obtained. According to this method, the ferrite thin plate 11 in the trench forming the block member
．． 11', non-magnetic block 91.91'.

By improving the machining accuracy of the grooves 92, 92' and the magnetic material 52, 52', a highly accurate and uniform slider 9 can be obtained.

Next, as shown in FIG. 6, the recording/reproducing magnetic core 12 around which the recording/reproducing coil 4 is wound is placed on the surface of the slider 90, and the ferrite portions 1.1a, 1.1a, 1.1a, 1.1a, 1.1a, 1.1a, 1.1a, 1.1, 1.1, 1.1, 1.1, 1.1, 1.1, 1.1, 1.2, 1.1, 2.1, 2.1, 2.1, 2.1, 2.1, 2.1.
The erase magnetic core 13 corresponding to the magnetic gaps 7' and 21 and around which the erase coil 7 is wound is inserted into the magnetic thin film layer 1 while passing the recording/reproducing head 12 through the opening 13'.
4.14', a magnetic head is formed by bringing them into contact with each other. Therefore, in this case, the dimensional accuracy of the magnetic cores 12 and 13 of the recording/reproducing head and the erasing head may be rougher than in the past, so the processing accuracy of the members is performed through the magnetic thin film layer 14.14'i in the region where the precision is not so high. 2-dimensional accuracy may be even better.

Note that the slider 9 may be manufactured directly by processing and joining a ferrite plate, a nonmagnetic plate, and a magnetic material, instead of using the method described above in which a block member is formed and then cut into slice pieces. . However, as described above, the block member must first be created.

The slicing method improves processing accuracy.

There is an advantage that a uniform slider can be obtained.

As described above, according to the present invention, the slider 9 of the magnetic head is formed as a member including magnetic gaps for recording/reproducing and erasing.

Since the recording/reproducing and erasing cores are in contact with each other, there is an advantage that a magnetic head having a highly accurate magnetic gap can be easily obtained. ! A recording/reproducing magnetic core 12 and an erasing magnetic core 13
In addition, a highly reliable magnetic head that does not require precision and is easy to assemble can be obtained in large quantities.

(9)

[Brief explanation of the drawing]

Figure 1 is an external perspective view showing the structure of a conventional magnetic head, Figure 2 is an external front view of the slider surface in Figure 1, and Figure 3 is an external perspective view showing the structure of a conventional magnetic head.
The figure is an external perspective view of the constituent members of a block member for manufacturing a slider according to an embodiment of the present invention. FIG. 4 is an external perspective view of a block member obtained from the constituent members shown in FIG. 3, FIG. 5 is an external front view of a slider with a magnetic thin film layer formed by cutting the block member shown in FIG. 4, and FIG. FIG. 1 is an exploded perspective view of a magnetic head according to an embodiment of the present invention. 1.2, 3, 5.5'...magnetic core, 4...recording/reproducing coil, 6...magnetic yoke, 7...erasing coil. 9...Slider, 10...Magnetic gap, 11.1
1'... Ferrite thin plate, 12... Recording/reproducing magnetic core. 12'... air gap, 13... magnetic core for erasing, 1.4.
14'...Magnetic thin film layer, 21...Magnetic gap, 5
1. ．． 51'...Magnetic pole part, 52.52' Magnetic material, 9
1.91'...Nonmagnetic block, 92.92'...Groove. (10) Figure 5 Figure 3 弗 4 JP-A-40519 (5)

Claims (1)

[Claims] 1. A magnetic head in which a magnetic core of an erasing head is disposed on both sides of a magnetic core of a recording/reproducing head. On both sides of the recording/reproducing magnetic gap forming part, which is formed by abutting two magnetic thin plates to form a recording/reproducing magnetic gap,
A magnetic material for forming an erasing magnetic gap is inserted into a groove carved on one side of a non-magnetic plate, and each of the two plates is placed adjacent to the magnetic gap for recording and reproducing to insert the magnetic material for erasing. A plate-shaped block member which is butt-joined so that a gap-forming magnetic material is located, and which is formed on one surface of the plate-shaped block member so as to extend in opposite directions from both sides of the magnetic materials. A magnetic head comprising: a plate-shaped 7" locking member having a magnetic thin film layer removed; the above-mentioned surface of the plate-shaped block member; the two magnetic material thin plates; and the other surface of the magnetic thin film serving as sliding surfaces. 2. In a method of manufacturing a magnetic head in which a magnetic core of an erasing head is disposed on both sides of a magnetic core of a recording/reproducing head, a composite plate-like body is formed by butting two thin plates of magnetic material, and two block-shaped Two blocks are formed by inserting a magnetic material into grooves carved in opposing surfaces of a non-magnetic material, and the abutting portions and the magnetic material of the two blocks are formed on both sides of the composite plate. The two blocks are joined by aligning the centers of the two blocks, the joined body is cut into a plurality of slices in a direction perpendicular to the magnetic material, and on one surface of the slice, the two magnetic materials are A magnetic thin film layer is formed so as to extend in opposite directions from both sides of the material, and a magnetic core for recording and reproduction is formed on the above-mentioned surface of the sliced piece. and an erasing magnetic core are brought into contact with the exposed surface of the composite plate and the exposed surface of the magnetic thin film, respectively.