JPH0676227A - Magnetic head - Google Patents

Abstract

PURPOSE:To provide the magnetic head having a long life and stable characteristics by constituting the circumference of the magnetic cores on a surface on which a recording medium slides of a wear resistant material which is formed by a thermal spraying method and has the hardness equal to or higher than the hardness of the material of the magnetic head. CONSTITUTION:Windings are formed in the central parts of the magnetic cores 1 consisting of a magnetic metallic material machined to a nearly U shape in section and the magnetic cores 1 are housed in the recessed parts on the inner side of a core holding frame 2 consisting of a high tensile cutting metal. The front ends of the magnetic cores 1 are projected by as much as the height nearly equal to the thickness component 6 of the wear resistant material layer to be thermally sprayed to the peripheries thereof and a magnetic gap material 4 for forming a magnetic gap is held in the front end parts of the magnetic cores 1. The core holding frame 2 is then fixed by means of screws 5 and a resin is injected from the arrow 8 direction and is solidified, by which the intermediate assembly of the magnetic head is formed. A zirconia ceramic layer is then formed as the wear resistant material layer 3 by the thermal spraying method around the projecting parts of the magnetic cores 1 projecting from the core holding frame 2. The wear resistant material layer 3 formed on the front surface on the sliding surface 7 side is so finished by polishing to an arc shape as to expose the front ends of the magnetic cores 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a magnetic tape recorder,
The present invention relates to a magnetic head used in a magnetic recording / reproducing apparatus such as a magnetic card reader, and relates to a structure of a magnetic head sliding surface.

[0002]

2. Description of the Related Art In a conventional general magnetic head, in order to improve wear resistance due to sliding of a magnetic recording medium such as a card or a tape, wear resistance is applied to a sliding surface portion near a magnetic gap of a sliding surface of the magnetic head. The structure of the magnetic head in which the conductive material is arranged is shown in FIG.
The structure was as shown in the example. In FIG. 2 (a),
A substantially C-shaped magnetic core 1 that has been wound in advance is housed in each core holding frame 2. As shown in FIG. 2A, the block-shaped wear resistant material 3 and the magnetic gap material 4 are interposed between the magnetic gap butting portions of the two core holding frames 2 accommodating the magnetic cores, and the screws 5 Through one core holding frame 2 and tighten it to the other core holding frame 2,
The inside of the core holding frame 2 is filled with molding resin from the direction of the arrow 8 in (a). As shown in FIG. 2B, the sliding surface 7 on the magnetic gap side of this assembly was ground into an arc shape to obtain a finished magnetic head.

[0003]

As described above, in the case of the structure in which the block-shaped wear-resistant material is put in a part of the core holding frame and the magnetic core, a partial wear-resistant effect is obtained, but the block-shaped wear-resistant effect is obtained. It is very difficult to accurately process and insert the wear-resistant material, and there is a problem that the wear state becomes non-uniform in the sliding surface and the reliability of the magnetic head is lowered. An object of the present invention is to provide a highly reliable magnetic head which eliminates the above-mentioned problems and in which a wear resistant material layer on a sliding surface of a magnetic head can be easily formed and which has less uneven wear.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a structure of a sliding surface of a magnetic head, in which a tip of a gap portion of a magnetic core is fixed before polishing a magnetic gap portion into an arc shape. By protruding from the core holding frame on the side where the recording medium slides and spraying wear-resistant material on the surface of the core holding frame around it, it adheres to the periphery of the magnetic core and wear-resistant on the sliding surface. Magnetic material layer having a wear-resistant material layer formed by a thermal spraying method on the entire circumference of the magnetic core on the sliding surface, which is obtained by forming a conductive material layer and polishing the sliding surface into an arc shape. To serve.

That is, according to the present invention, a pair of magnetic cores having coil windings and a core holding frame accommodating the magnetic cores inside thereof are abutted with each other to form a butted portion, and the butted portion is formed. In a magnetic head in which a magnetic gap part is formed by inserting a magnetic gap material into one of the parts, is fixed with resin, etc., and the sliding surface part around the magnetic gap on which the recording medium slides is polished into an arc shape. Abrasion resistance having a hardness equal to or higher than the hardness of the magnetic core material used for the magnetic head on the surface of the head on which the recording medium slides and on the core holding frame around the magnetic core on the side of the magnetic gap. A magnetic material layer provided by a thermal spraying method, and then polishing the sliding portion around the magnetic gap into an arc shape, wherein the core around the magnetic core is on the sliding surface side of the core holding frame. Directly sprayed on the holding frame The have equal or higher hardness on the hardness of the magnetic core material of the magnetic head, a magnetic head, characterized in structures wear resistant material layer is provided.

[0006]

According to the present invention, a layer of wear-resistant material having a hardness equal to or higher than the material of the magnetic head formed by the thermal spraying method is provided around the magnetic core on the sliding surface of the recording medium of the magnetic head. With the structure, the magnetic core and its surroundings are worn on average, so that the magnetic core can be used stably for a long period of time and the life can be extended. Further, since the wear resistant material layer is simple and formed in close contact with the magnetic core, a highly reliable magnetic head can be obtained at low cost. Further, by selecting a material equal to or higher than the material of the magnetic core, uniform wear and wear resistance as a magnetic head are improved.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1A and 1B are external perspective views for explaining the assembly of a magnetic head according to an embodiment of the present invention. FIG. 1A shows a state before forming a wear resistant material layer, and FIG. 1B shows a wear resistant material layer. 1C shows the state immediately after the formation, and FIG. 1C shows a state in which the sliding surface is polished and finished into an arc shape. As shown in FIG. 1A, a magnetic core 1 made of a metal magnetic material machined to have a U-shaped cross section has a winding formed in the central portion thereof, and the inside of a core holding frame 2 made of a high machinable metal. The magnetic core 1 in the recess of
And a magnetic gap material 4 for forming a magnetic gap by projecting the tip of the magnetic core 1 by a height approximately equal to the thickness 6 of the wear-resistant material layer sprayed on the periphery.
Is sandwiched between the front ends of the magnetic cores 1, the core holding frame 2 is fixed with screws 5, and resin is injected from the direction of the arrow 8 and solidified to form an intermediate assembly of the magnetic head. Next, as shown in FIG. 1B, the magnetic core 1 protruding from the core holding frame 2.
A layer of zirconia-based ceramics is formed as a three-layer wear-resistant material around the protruding portion by thermal spraying so that the tip of the magnetic core is covered. Next, as shown in FIG. 1C, the tip of the magnetic core 1 is exposed on the sliding surface 7 of the intermediate assembly of the magnetic head in which the three layers of the wear resistant material are formed on the surface on the sliding surface 7 side. Then, the magnetic head is completed by polishing and finishing in an arc shape.

The magnetic head manufactured according to this embodiment is
A wear resistant material layer of zirconia-based ceramics is formed, which is slightly higher in hardness than the material of the magnetic core. When this magnetic head was used as a medium for a magnetic card, the sliding surface of the magnetic head was evenly worn, uneven wear did not appear, and deterioration of the recording / playback characteristics due to deterioration of contact between the magnetic card and the magnetic head was observed. It was not possible to operate, and it operated stably even at operating time that was twice as long as the conventional life time. Further, since the wear-resistant material layer is formed by the thermal spraying method, the formed layer can be formed so as to be in close contact with the magnetic core and the core holding frame to cover the entire surface, and the number of machining and bonding steps can be reduced, resulting in a highly reliable magnetic The head was obtained at low cost.

[0009]

As described above, according to the present invention,
It is possible to inexpensively supply a magnetic head having a stable characteristic with little uneven wear and a long life.

[Brief description of drawings]

1A and 1B are external perspective views illustrating assembly of a magnetic head according to an embodiment of the present invention, FIG. 1A shows a state before a wear resistant material layer is formed, and FIG. 1B shows a wear resistant material. FIG. 1 (c) shows a state immediately after forming the layer, and FIG. 1 (c) shows a state in which the sliding surface is polished and finished into an arc shape.

2A and 2B are external perspective views for explaining the assembly of a conventional magnetic head, FIG. 2A shows a sliding surface side before arc finish polishing, and FIG. 2B shows arc finish polishing. The sliding surface in the state shown in FIG.

[Explanation of symbols]

 1 magnetic core 2 core holding frame 3 wear resistant material 4 magnetic gap material 5 screw 6 thickness of wear resistant material layer 7 sliding surface 8 arrow

Claims (1)

[Claims] 1. A pair of magnetic cores having coil windings, and a core holding frame having the magnetic cores housed therein, the ends of which are abutted to each other to form an abutting portion, and one of the abutting portions is formed. In a magnetic head in which a magnetic gap portion is formed by inserting a magnetic gap material, which is further fixed with resin or the like, and a sliding surface portion around which the recording medium slides is polished into an arc shape, the recording medium of the magnetic head is used. On the surface side on which the slides, a wear-resistant material layer having a hardness equal to or higher than the hardness of the magnetic core material used for the magnetic head is provided on the core holding frame around the magnetic core on the magnetic gap side. The magnetic head is formed by a thermal spraying method and then the sliding portion around the magnetic gap is polished into an arc shape, and the magnetic head is provided on the core holding frame around the magnetic core on the sliding surface side of the core holding frame. The magnetic field processed by the direct spraying method A magnetic head having a structure provided with an abrasion resistant material layer having a hardness equal to or higher than the hardness of the magnetic core material of the pad.