JPH04132607U - magnetic head - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a magnetic head that prevents uneven wear of a sliding surface on which a magnetic medium slides. [Structure] The sliding material 7 on the sliding surface on which the magnetic card slides is made of a material having the same hardness as the cores 1 and 2.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a magnetic head used in magnetic card readers/writers and the like.

0002

[Conventional technology]

A conventional magnetic head of this type will be explained with reference to FIGS. 2 and 3. Conventional magnetic heads are made of Fe-based magnetic metal material, and have recording and reproducing windings. It has a magnetic core around which wire is wound. This magnetic core has a side cross section as shown in Figure 3. It has cores 1 and 2 cut into a substantially U-shape, and one end is magnetically connected. A magnetic gap G is formed between the other ends. This magnetic core As shown in Figure 2, from high-strength free-cutting metal material (for example, Vickers hardness of about 180) It is held by core holders 4 and 5 consisting of. Core holder 4 and core holder 5, there is a spacer 3 for holding the above-described magnetic gap G. child In the magnetic head shown in the figure, the upper surface is polished to have an R surface. Also, electrical signal input/output (fixed to each end of the winding). In fact, magnetic media such as magnetic cards are polished on the R surface, as shown by the arrow in Figure 2. 3. Slide the surface in the direction across the magnetic gap (spacer 3). When sliding, magnetic The medium is distributed between the surfaces of cores 1 and 2 (indicated by diagonal lines in the figure) and core holders 4 and 5. contact with the surface adjacent to the surfaces of cores 1 and 2 (indicated by diagonal lines in the figure) . Hereinafter, the surface of the magnetic head that comes into contact with the magnetic medium will be referred to as a sliding surface. The width of the sliding surface is shown in the diagram. , denoted by W.

0003

[Problem that the idea aims to solve]

As mentioned above, the conventional magnetic head has a core 1 whose sliding surface is made of a magnetic metal material. and 2, and core holders 4 and 5 made of high-strength free-cutting metal material. . If the sliding surface is made of metal materials with relatively large differences in hardness, , a difference in wear occurs on the surface as the magnetic medium slides. Figure 4 shows a conventional magnetic head. This figure shows the condition of the sliding surface after sliding a magnetic card (magnetic medium) 2 million times using vinegar. Due to the difference in wear, the widthwise edges of the sliding surface of the core sag and the spacing is reduced. There is a problem in that the magnetic properties are deteriorated. The object of this invention is to provide a magnetic head in which uneven wear of the sliding surface is prevented. Ru.

0004

[Means to solve the problem]

According to the present invention, a magnetic core having a magnetic gap and a predetermined hardness; A magnetic head having a core holder for holding a magnetic core, wherein the magnetic medium is When sliding against the magnetic head in a direction across the magnetic gap, the magnetic core (a) the predetermined core surface near the magnetic gap and the predetermined core surface of the core holder; a predetermined core holder surface that is adjacent to the core holder surface that is in contact with the magnetic medium; In the core holder, the core holder defines the predetermined core holder surface. A first holder part that is a part of the holder, and the remaining part excluding the first holder part. a second holder part, the first holder part being the magnetic A magnetic device characterized in that it is formed of a material having substantially the same hardness as the core. You will get the head.

[0005]

【Example】

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a magnetic head according to this embodiment. In the figure, same as conventional example Alternatively, corresponding parts are given the same reference numerals. First, a method of manufacturing a magnetic head according to this embodiment will be explained. It is made of Fe-based magnetic metal material and has a side cross section cut into a substantially U-shape (not shown). Winding wires are wound around the center portions of A 1 and 2, respectively. Cores 1 and 2 are combined to form a magnetic core. Magnetic gap members 6 made of a non-magnetic metal material are combined on both sides of the magnetic core. Furthermore, on both sides there are sliding materials that are the first holder portion made of Fe-based magnetic metal material. Combine 7. The magnetic core in this state is made of a high-strength, free-cutting metal (for example, a Vickers hardness of about 180). ) is held by core holders 4 and 5 consisting of. At this time, in order to form a magnetic gap between the core holder 4 and the core holder 5. sandwich the spacer 3. Each end of the winding is fixed to a terminal 8 for inputting and outputting electrical signals. Inject resin into each core holder and harden. As shown in the figure of this magnetic head, the top surface is polished into a shape that takes into consideration the sliding of the magnetic medium. . The hardness of the spacer 3 and the magnetic gap material 6 is also substantially the same as that of the magnetic core. Identical hardness is desirable. The magnetic head manufactured as described above has the same sliding surface as cores 1 and 2. Made of one material (same hardness).

[0006] Figure 5 shows the results of sliding a magnetic card 2 million times using the magnetic head according to this example. These are the results of measuring the condition of the sliding surface of the magnetic head after the magnetic head was moved. Conventional magnetic head ( When compared with Fig. 4), it can be seen that the difference in wear on the sliding surfaces is small. FIG. 6 shows the sliding movement of the magnetic card in the magnetic head according to this embodiment and the conventional example. It shows changes in the reproduction output of the magnetic head with respect to the number of times. In the figure, this example and the conventional example are shown by solid and broken lines, respectively. In the same figure, a conventional magnetic head has a sliding rotation. It decreases significantly as the number increases. In contrast, the magnetic head of this embodiment It can be seen that the drop in playback output, that is, the characteristic due to spacing, is relatively small in the Karu. In this example, the same magnetic metal material as the core was used as the sliding material, but the same magnetic metal material as the core was used. Using a non-magnetic metal material with hardness (for example, Vickers hardness 350 to 500) In this case, no magnetic gap material is required. In addition, it is not limited to metal materials, but also non-metal materials. It can be made of wood

[0007]

[Effect of the idea]

In the magnetic head according to the present invention, the sliding surface portion on which the magnetic medium slides is substantially the core. Since it is made of metal material with the same hardness, uneven wear on the sliding surface is prevented and the core slides smoothly. The edges of the moving surface in the width direction may sag, resulting in spacing and deterioration of magnetic properties. do not have.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of a magnetic head according to the present invention.

FIG. 2 is a perspective view showing a conventional magnetic head.

FIG. 3 is a diagram showing a conventional magnetic core and a magnetic core applied to the present invention.

FIG. 4 is a diagram showing the state of a sliding surface after a magnetic card is slid on a conventional magnetic head.

FIG. 5 is a diagram showing the state of the sliding surface after a magnetic card is slid on the magnetic head according to the present invention.

FIG. 6 is a diagram showing reproduction outputs of magnetic heads according to the prior art and the present invention with respect to the number of times the magnetic medium is slid.

[Explanation of symbols]

1, 2 core 3 Spacer 4, 5 Core holder 6 Magnetic gap material 7 Sliding material W Width of sliding surface

Claims (3)

[Scope of utility model registration request] 1. A magnetic head having a magnetic gap, a magnetic core having a predetermined hardness, and a core holder holding the magnetic core, wherein a magnetic medium is attached to the magnetic head in a direction crossing the magnetic gap. In the magnetic head, a predetermined core surface of the magnetic core near the magnetic gap and a predetermined core holder surface adjacent to the predetermined core surface of the core holder contact the magnetic medium when sliding against the magnetic medium. , the core holder is divided into a first holder part that is a part of the core holder and defines the predetermined core holder surface, and a second holder part that is the remaining part excluding the first holder part. , said first
A magnetic head, wherein the holder portion is made of a material having substantially the same hardness as the magnetic core. 2. The magnetic core is made of a magnetic metal material, the first holder part is made of substantially the same magnetic metal material as the magnetic core, and the second holder part is made of a non-magnetic metal material. 2. The magnetic head according to claim 1, wherein the first holder portion and the magnetic core are magnetically insulated. 3. The magnetic core is made of a magnetic metal material, and the first holder portion is made of a non-magnetic metal material having substantially the same hardness as the magnetic core. magnetic head.