JPH0130213B2 - - Google Patents

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 a floppy disk device, and a method for manufacturing the same.

A magnetic head for a floppy disk drive consists of a tunnel erase head, which has an erase head with a magnetic gap in the same direction on both sides of the recording/reproducing head, and a tunnel erase head, which has an erase head with a magnetic gap in the same direction as the recording/reproducing head. There is a straddle erase head in which the gap between the erasing magnetic pole and the recording/reproducing core is a magnetic gap for erasing.

A conventional straddle erase head has a magnetic gap 21 formed between a magnetic core 1 and a magnetic core 2 around which a recording/reproducing coil 4 is wound, as shown in FIG. The recording/reproducing head is configured as a closed magnetic path. In addition, the erasing coil 7 is wound around a bent part 8 at the tip.
The magnetic yoke 6 provided with the magnetic yoke 8' and the erasing magnetic cores 5, 5' embedded in the slider 9 contact each other at the bent portions 8, 8' to form a closed magnetic path and constitute an erasing head. These magnetic cores have a magnetic gap 2 for recording and reproducing on the sliding surface of the magnetic medium as shown in Figure 2.
The magnetic cores 1 and 2 forming the magnetic core 1 are held between a slider 9 made of a non-magnetic material. Further, the magnetic pole parts 51 and 51' of the magnetic yoke 6 of the erasing head embedded in the slider 9 are provided through the sliding surface and between the magnetic pole parts 51 and 51' and the magnetic cores 1 and 2 for recording and reproduction. Forms a magnetic gap for erasing.

This type of magnetic head has high density recording, so the magnetic gap 21 for recording and reproduction is less than 2 μm, and the erase gap is also narrow, around 20 μm.The overall dimensions are approximately 6 x 6 mm in height and width, and the magnetic core is 1, 2, 3, 5, 5', core members such as the magnetic yoke 6, and component parts such as the slider 9 require highly accurate machining. In addition, these components are generally bonded using low-melting point glass or special resin, and are made of highly precise parts to form an extremely narrow magnetic gap, making the assembly process complicated and requiring many man-hours. Furthermore, it is difficult to obtain a large quantity of magnetic heads with uniform characteristics, and there are drawbacks of large deviations in characteristics and lack of 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 that comes into 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 recording/reproducing magnetic gap forming section in which a magnetic gap for recording/reproducing is constructed by abutting two thin magnetic plates against each other in 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 a magnetic gap for erasing inserted into a groove cut on one side of a non-magnetic plate are placed adjacent to the magnetic gap for recording and reproducing. A plate-shaped block member which is butt-joined 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 thin film layer, and a recording/reproducing magnetic core and an erasing magnetic core that are in contact with the two magnetic material thin plates and the magnetic thin film layer, respectively, on the one surface of the plate-shaped block member. The magnetic head has a magnetic core, and the other surface of the plate-shaped block member is a sliding surface.

Furthermore, the present invention provides 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 abutting two thin plates of magnetic material; Two blocks are formed in which a magnetic material is fitted into grooves cut into opposing surfaces of each block-shaped non-magnetic material, and the abutting portion and the two blocks are formed on both sides of the composite plate-like body. The two blocks are joined by aligning the centers of the magnetic materials of the blocks, the joined body is cut into a plurality of slices in a direction perpendicular to the magnetic material, and the above is placed on one surface of the slices. A magnetic thin film layer is formed extending in opposite directions from both sides of both magnetic materials, and a magnetic core for recording and reproducing and a magnetic core for erasing are placed on the one surface of the sliced piece on the exposed surface of the composite plate. and a method for manufacturing a magnetic head, characterized in that the magnetic head is brought into contact with the exposed surface of the magnetic thin film layer.

According to the present invention, since the sliding part having the magnetic gap and the magnetic core part of the magnetic head can be formed separately and assembled later, the precision of the magnetic gap can be increased, and variations in the characteristics of the magnetic head can be prevented. You can easily get small ones.

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

Referring to FIG. 3, grooves 92, 92' are formed in one side of each of blocks 91, 91' made of a non-magnetic material constituting the slider 9.
A magnetic material 52, 52' as an erase head magnetic pole material having a thickness smaller than the depth is fitted into 92'.
Further, two ferrite thin plates 11 and 11' are butted against each other with their end surfaces to form a composite plate having a magnetic gap 21. Next, on both sides of this composite board,
So that the magnetic gap 21 is located at the center of the magnetic materials 52, 52' of the blocks 91, 91'.
Blocks 91 and 91' are brought into contact with each other and bonded with glass or special resin to obtain a block member as shown in FIG. 4.

Next, process the outer periphery of the block member shown in Fig. 4,
As shown by the dotted lines, the slices are cut into a plurality of slices using a multi-wire saw, and on one surface of the slices, a magnetic thin film layer 14 is placed on both sides of the magnetic material and on opposite sides of both magnetic materials. 14' to obtain a slider 9 as shown in FIG. According to this method, the ferrite thin plates 11, 11', the non-magnetic block 91,
By improving the machining accuracy of 91', grooves 92, 92', and magnetic materials 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 attached to the magnetic gap 21 of the ferrite portions 11a, 11a' with the gap 12' cut off, on the surface of the slider 9. Correspondingly, the erasing magnetic core 13, around which the erasing coil 7 is wound, is inserted into the magnetic thin film layers 14, 14' while passing the recording/reproducing head 12 through its opening 13'.
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 that the machining accuracy of the members does not need to be so high. In particular, regarding the erase head, the connection with the magnetic pole parts 51, 51' is as follows.
Since the magnetic thin film layers 14, 14' are formed in a larger area, the dimensional accuracy may be even rougher.

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 mentioned above, first create the block member,
The method of slicing this has the advantage of increasing processing accuracy and obtaining a uniform slider.

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 and reproduction, and for 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. Also, the recording/reproducing magnetic core 12
Both the erase magnetic core 13 and the erase magnetic core 13 do not require precision, and a highly reliable magnetic head that can be easily assembled in large quantities can be obtained.

[Brief explanation of drawings]

FIG. 1 is an external perspective view showing the structure of a conventional magnetic head, FIG. 2 is an external front view of the slider surface in FIG. 1, and FIG. 3 is a configuration of a block member for manufacturing a slider according to an embodiment of the present invention. FIG. 4 is an external perspective view of the block member obtained from the component shown in FIG. 3, and FIG. 5 is a front view of the slider with a magnetic thin film layer formed by cutting the block member shown in FIG. 4. 6 are exploded perspective views 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,
11'... Ferrite thin plate, 12... Recording and reproducing magnetic core, 12'... Air gap, 13... Erasing magnetic core, 14,
14'...Magnetic thin film layer, 21...Magnetic gap, 51,
51'...Magnetic pole part, 52, 52'...Magnetic material, 91,9
1'...Nonmagnetic block, 92, 92'...Groove.

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, 2
A magnetic material for forming a magnetic gap for erasing is inserted into a groove carved on one side of a non-magnetic plate on both sides of a recording/reproducing magnetic gap forming section in which a magnetic gap for recording/reproducing is formed by butting together two magnetic thin plates. A plate-shaped block member formed by butt-joining two plates each formed by a magnetic material such that the magnetic material for forming the magnetic gap for erasing is located adjacent to the magnetic gap for recording and reproducing, the plate-shaped block member comprising: a plate-shaped block member having a magnetic thin film layer 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 recording/reproducing magnetic core and an erasing magnetic core in contact with a magnetic thin plate and the magnetic thin film layer, respectively, the other surface of the plate-shaped block member being a sliding surface. 2. In a method of manufacturing a magnetic head in which the magnetic core of an erasing head is disposed on both sides of the magnetic core of a recording/reproducing head, a composite plate-like body is formed by butting two thin magnetic material plates, and two block-shaped Two blocks are formed in which a magnetic material is inserted into grooves carved on opposing surfaces of a non-magnetic material, and the abutting portions and each of the magnetic materials of the two blocks are formed on both sides of the composite plate. The two blocks are joined together with their centers aligned, 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 slice, from both sides of both the magnetic materials. Magnetic thin film layers are formed so as to extend in opposite directions, and a magnetic core for recording and reproduction is provided on the one 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.