JPH0579706U - Magnetic head - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a magnetic head in which a magnetic metal film is disposed in a magnetic path, and an object thereof is to provide a magnetic head whose output characteristics are improved while preventing uneven wear. And [Structure] A pair of core halves 21, 22 are joined together to form a magnetic head 20, and the abutting surface 2 of the core halves 21, 22 is joined.
By disposing the metal magnetic film 28 in the winding groove 26 (27) on the core half side of at least one of the winding grooves 26 and 27 formed in Nos. 3 and 24, uneven wear in the gap portion 25 is prevented. , A magnetic head that has improved output characteristics at low cost.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a chip-shaped magnetic head in a video tape recorder or a floppy disk drive formed by joining a pair of core halves, and more particularly to a magnetic head having a metal magnetic film arranged in a magnetic path.

[0002]

[Prior Art]

 2. Description of the Related Art Conventionally, as a chip-shaped magnetic head for, for example, a video tape recorder, there are magnetic heads shown by the magnetic head 1 in FIG. 2 and the magnetic head 10 in FIG. 3, which will be described.

The magnetic head 1 shown in FIG. 2 is composed of a pair of core halves 2 and 3 made of a magnetic material such as ferrite. Gap forming portions 4a, 5a, winding groove portions 4b, 5b, and rear joint portions 4c, 5c are formed on the abutting surfaces 4, 5 of the core halves 2, 3, respectively.

Then, metal magnetic films 6 and 7 which are ferromagnetic alloys such as Fe / Al / Si are formed on the abutting surfaces 4 and 5 of the core halves 2 and 3, and are joined to each other in an abutting state. Therefore, the magnetic head 1 has the metal magnetic films 6 and 7 formed in the gap portion 8.

Next, in the magnetic head 10 shown in FIG. 3, the winding grooves 15 and 16 are provided on the abutting surfaces 13 and 14 of the pair of core halves 11 and 12 formed of a magnetic material such as ferrite to form a gap. The structure is such that they are joined to form the portion 17, and no metal magnetic film is formed in the gap portion 17.

[0006]

[Problems to be solved by the device]

 However, in the conventional magnetic heads 1 and 10 described above, first, in the magnetic head 1 in which the metal magnetic films 6 and 7 are disposed in the gap portion 8, the core halves 2 and 3 as the base material are different from the ferrite material in the gap. Since the portion 8 is the magnetic metal films 6 and 7 of the ferromagnetic alloy, when the recording medium, for example, a magnetic tape slides on the gap forming surface and acts, the gap portion 8 and the core halves 2 and 3 on both sides thereof. Uneven wear occurs between the magnetic tape and the sliding surface of the magnetic tape, and good contact with the magnetic tape cannot be obtained, and it is costly to form the metal magnetic films 6 and 7 in the gap portion 8. There was a problem that it required.

In the magnetic head 10 shown in FIG. 3, the magnetic head 10 has a structure in which the gap portion 17 is formed only by joining the core halves 11 and 12 with a magnetic material such as ferrite. Therefore, there is an advantage that the magnetic head can be manufactured at low cost, but there has been a problem that the output characteristics as a magnetic head are deteriorated as compared with a magnetic head having a metal magnetic film in the gap.

The present invention has been devised in view of the above problems, and an object thereof is to provide a magnetic head that is free from uneven wear and has improved output characteristics.

[0009]

[Means for Solving the Problems]

 Therefore, as a means for solving the above-described problems, the present invention provides a magnetic head formed by joining a pair of core halves, and at least one of winding grooves formed on the abutting surface of the core halves. The magnetic head structure is characterized in that the metal magnetic film is disposed in the groove for winding on the core half side.

[0010]

[Action]

 No magnetic metal film is provided in the gap of the magnetic head, and the magnetic metal film is provided in the winding groove that serves as a magnetic path, so the sliding surface with the magnetic tape is only the core half that is the base material. Therefore, it acts so that uneven wear does not occur.

By disposing the metal magnetic film in the winding groove, the output characteristics are improved as compared with the magnetic head in which the metal magnetic film is not disposed.

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to the magnetic head 20 shown in FIG.

As shown in the figure, the magnetic head 20 has a configuration in which a gap portion 25 is formed by joining abutting surfaces 23, 24 of a pair of core halves 21, 22 made of a magnetic material such as ferrite as a base material. It is said that.

Here, in the magnetic head 20, winding grooves 26 and 27 are formed on the abutting surfaces 23 and 24 of the core halves 21 and 22, and Fe-Al is formed only inside the winding grooves 26 and 27. The metal magnetic film 28 made of a ferromagnetic alloy material such as -Si is formed by means such as vapor deposition and sputtering, and the metal magnetic film 28 is not provided in the gap portion 25.

That is, in the magnetic head 20, on the sliding contact surface 29 of the magnetic tape that is the recording medium, only the ferrite material portion that is the base material of the core halves 21 and 22 exists on both sides of the gap portion 25. ing.

Therefore, in the magnetic head 20, the portion of the gap 25 on the magnetic tape sliding contact surface 29 is worn under the same wear condition, so that uneven wear does not occur and a magnetic path is formed. Since the metal magnetic film 28 is provided in the winding groove portion, the saturation magnetic flux density in the magnetic path of the magnetic head 20 can be made higher than that in the case where only the ferrite material is used. It is possible to improve. Here, the metal magnetic film 28 may be a single film or a multilayer film.

In addition, since the magnetic head 20 does not have the metal magnetic film 28 exposed in the gap portion 25 thereof, it is possible to prevent the pseudo gap action from occurring, which is cheaper than the case where the metal magnetic film 28 is provided on the entire surface. It can be configured in various ways.

In addition, as one embodiment of the present invention, the example in which the metal magnetic film 28 is provided on both of the pair of core halves is shown, but the invention is not limited to this, and the core half of the pair of core halves is not limited to this. If the magnetic paths are formed in different shapes and one magnetic path is smaller than the other magnetic path, for example, if a winding groove is formed in only one, the core half with a small magnetic path It may be configured to form a magnetic metal film on the winding part to supplement the magnetic flux density, and the magnetic head is not limited to a head chip for a video tape recorder, but a magnetic head for a magnetic disk drive. You can do it.

[0019]

[Effect of the device]

 Therefore, according to the magnetic head of the present invention having the above-described structure, it is possible to prevent the occurrence of uneven wear in the gap portion of the magnetic head and the occurrence of the pseudo gap effect during the sliding contact with the magnetic tape. Therefore, the characteristics can be kept good and the life of the magnetic head can be improved. In addition, by providing a metal magnetic film inside the winding groove to increase the saturation magnetic flux density, intermediate output characteristics with and without the metal magnetic film in the gap can be obtained. It can be manufactured at a lower cost than a magnetic head having a metal magnetic film on the entire surface, and the cost can be reduced.

[Brief description of drawings]

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

FIG. 2 is a perspective view of a first example of a conventional magnetic head.

FIG. 3 is a perspective view of a second example of a conventional magnetic head.

[Explanation of symbols]

 20 magnetic head 21, 22 core half 23, 24 abutting surface 25 gap part 26, 27 winding groove 28 metal magnetic film 29 magnetic tape sliding contact surface

Claims (1)

[Scope of utility model registration request] 1. A magnetic head formed by joining a pair of core halves, wherein metal winding is formed in at least one core half-side winding groove portion of a winding groove formed on an abutting surface of the core halves. A magnetic head comprising a film.