JPH04358306A - Magnetic head - Google Patents

Abstract

PURPOSE:To provide a metal laminated head which has high efficiency and allows easy process for production. CONSTITUTION:Laminated magnetic metallic films 13 are crimped by a soft magnetic material substrate 15 and a nonmagnetic substrate 14. The substrates varying in magnetic nature face each other on the butt surfaces of magnetic head core half bodies and the back gap side of the butt surfaces of the magnetic head core half bodies face the soft magnetic substrates of the magnetic head core half bodies on which the laminated magnetic metallic films face each other.

Description

[Detailed description of the invention]

[Purpose of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head used in a magnetic recording/reproducing device such as a video tape recorder.

0002

[Prior Art] In recent years, with the increase in recording density in magnetic recording and reproducing devices such as video tape recorders, metal tapes with high coercive force have been adopted and in order to cope with the widening of signal bands, metal magnetic laminated films are used on non-magnetic substrate material substrates. A metal laminate head with a sandwiched structure has been proposed. Furthermore, in order to improve the efficiency of the head, there is also a metal laminate head using a composite structure substrate member, in which the vicinity of the sliding surface is made of a non-magnetic material and the remaining part is made of an oxide magnetic material. ("Method for Manufacturing Magnetic Head" Japanese Patent Application Laid-Open No. 137711/1982). This conventional magnetic head will be explained in detail using FIG. 7.

In FIG. 7, a composite substrate 54a consists of substrate members 55a and 56a. Composite board 54b consists of board members 55b and 56b. A magnetic head core half 60 formed by sandwiching a metal magnetic laminated film 53 formed by alternately arranging metal magnetic thin films 51 and insulating films 52 between a pair of composite substrates 54a and 54b, and another winding similarly formed. Line groove 5
7 and a magnetic head core half 61 with a gap spacer (not shown) interposed therebetween, and a winding wire (not shown) is wound in the winding groove 57 to form a magnetic head.

Here, the substrate members 55a, 5 of the magnetic head
By using a non-magnetic material such as non-magnetic ceramic for 5b, 58a, 58b and an oxide magnetic material such as ferrite for the substrate members 56a, 56b, 59a, 59b, the magnetism of the back gap portion on the opposite side of the sliding surface is reduced. Lowers resistance and improves head efficiency.

However, the conventional metal laminate head, which has a structure in which a metal magnetic laminated film is sandwiched between non-magnetic substrates,
Efficiency is low due to high magnetic resistance in the back gap, and metal laminate heads with a structure sandwiched between composite substrates made of magnetic and non-magnetic substrates are highly efficient, but require separate production of the composite substrate, which reduces the production process. The disadvantage was that it was complicated.

[0006]

[Problems to be Solved by the Invention] As described above, the efficiency of the conventional metal laminated head, which has a structure in which a metal magnetic laminated film is sandwiched between non-magnetic substrates, is low, and the efficiency of the metal laminated head is low. A metal laminate head having a structure in which it is sandwiched between composite substrates has the disadvantage that the manufacturing process is complicated. The object of the present invention is to eliminate the drawbacks of the prior art as described above, and to provide a metal laminate head that is highly efficient and easy to manufacture. [Structure of the invention]

[0007]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a magnetic head core half having a structure in which a metal magnetic laminated film is sandwiched between soft magnetic and non-magnetic substrates. provide the head. Further, the present invention provides the magnetic head, wherein substrates having different magnetic properties are opposed to the front gap side of the abutting surfaces of the magnetic head core halves.

[0008] Furthermore, there is provided the magnetic head, wherein the back gap side of the abutting surface of the magnetic head core halves faces the soft magnetic substrate of the magnetic head core half that the metal magnetic laminated film faces. do.

[0009]

[Operation] In the magnetic head manufactured in this way,
Since one of the substrates on the tape sliding surface is a non-magnetic substrate, sliding noise is reduced. Further, since substrates having different magnetic properties face each other on the sliding surface side of the abutting surfaces of the magnetic head core halves, no magnetic gap is formed on the substrate on the sliding surface side.

[0010] Furthermore, since the area in which the magnetic material (metal thin film portion, magnetic substrate portion) contacts in the back gap portion is large, efficiency is high, and manufacturing is easy because the substrate does not have a composite structure.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described in detail below with reference to FIGS. 1 to 6. FIG. 1 is a perspective view of a metal laminate head in one embodiment of the present invention. However, the windings are omitted.

In FIG. 1, a metal magnetic laminated film 13 obtained by alternately laminating metal magnetic thin films 11 and insulating films 12 is as follows.
The non-magnetic substrate 14 and the magnetic substrate 15 are sandwiched so that half of the non-magnetic substrate 14 and the magnetic substrate 15 appear on the tape sliding surface, and only the magnetic substrate 15 appears at the back gap on the opposite side. They are sandwiched together to form a magnetic head core half 16. Similarly, it has a winding groove 19, a metal magnetic laminated film 24 is sandwiched between a non-magnetic substrate 23 and a magnetic substrate 22, and the other magnetic head core half 18 is formed. Then, the non-magnetic substrate 14 and the magnetic substrate are connected by filler glasses 25 and 26 for bonding the substrates near the working gap 21, which is the magnetic gap on the tape sliding surface side, and filler glass 20 for bonding the substrates on the back gap side. 22, the magnetic substrate 15 and the non-magnetic substrate 23 face each other, and the non-magnetic substrate and the magnetic substrate are joined to face each other at the tape sliding surface.

Next, a method of manufacturing this magnetic head will be explained using FIGS. 2 to 6. 2 to 6 are perspective views for explaining the manufacturing process of a metal laminate head according to an embodiment of the present invention.

In FIG. 2, an insulating film 28 such as SiO2 and a metal magnetic thin film 29 are alternately laminated by a sputtering method or the like on a magnetic substrate (for example, ferrite) 27 having a thickness approximately equal to the head core thickness to form a metal magnetic laminated film 30. . Furthermore, on top of this is a non-magnetic substrate 3 approximately half the thickness of the head core.
Glue 1. Further, the magnetic substrate 32 is bonded again, and the same steps are repeated to obtain a laminate 33 of the magnetic substrate, the metal magnetic laminate film, and the nonmagnetic substrate.

This laminated body 33 is cut at a predetermined angle along A-A' so that the metal magnetic laminated film 30 has an oblique structure like the metal magnetic laminated film 13 shown in FIG. 1, as shown in FIG. A laminated substrate 34 is obtained. The laminated substrate 34 shown in FIG. 3 is cut along BB' according to the azimuth angle to obtain a laminated block 35. A groove 38 for winding and a groove 37 for filling adhesive glass are provided on one side of the BB' section of the laminated block 35 in FIG.
After this is made, this surface is mirror-finished to obtain a magnetic head core half laminated block 36 shown in FIG. 4.

The other magnetic head core half laminated block 39 is formed by gouging the laminated block 35 to form track width regulating grooves 40, and then mirror-finishing this surface to form the other magnetic head core half laminated block 39 as shown in FIG. A head core half laminated block 39 is obtained.

These two magnetic head core half laminated blocks 36 and 39 are arranged so that the metal magnetic laminated film portions coincide with each other on the tape sliding surface, and are bonded together using adhesive glasses 42 and 41, and then fixed as shown in FIG. D-D' so that the core thickness is
Cut it to obtain a magnetic head chip. After this, processing such as forming a sliding surface is performed to obtain the proposed magnetic head core as shown in FIG.

[0018]

[Effects of the Invention] According to the present invention, since one of the substrates on the tape sliding surface is a non-magnetic substrate, sliding noise is reduced, and the abutting surfaces of the magnetic head core halves have substrates with different magnetic properties facing each other. Therefore, no magnetic gap is formed on the substrate. Furthermore, since the area where the magnetic material contacts in the back gap portion of the magnetic head is large, efficiency is high, and manufacturing is easy because the substrate does not have a composite structure.

[Brief explanation of drawings]

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

FIG. 2 is a perspective view of a method of manufacturing an embodiment of a magnetic head according to the present invention.

FIG. 3 is a perspective view of a method of manufacturing an embodiment of the magnetic head according to the present invention.

FIG. 4 is a perspective view of a method of manufacturing an embodiment of the magnetic head according to the present invention.

FIG. 5 is a perspective view of a method of manufacturing an embodiment of the magnetic head according to the present invention.

FIG. 6 is a perspective view of a method of manufacturing an embodiment of the magnetic head according to the present invention.

FIG. 7 is a perspective view of a conventional magnetic head.

[Explanation of symbols]

11 Metal magnetic thin film 12 Insulating film 13 Metal magnetic laminated film 14, 23 Non-magnetic substrate 15, 22 Magnetic substrate 16, 18 Magnetic head core half 19 Winding groove 20, 25, 26 Filling glass 21 Working gap 24 Metal magnetic laminated film

Claims (3)

[Claims] 1. A magnetic head having a magnetic head core half having a structure in which a metal magnetic laminated film is sandwiched between soft magnetic and nonmagnetic substrates. 2. The magnetic head according to claim 1, wherein a front gap side of the abutting surfaces of the magnetic head core halves is opposed to substrates having different magnetic properties. 3. The back gap side of the abutting surface of the magnetic head core halves faces the soft magnetic substrate of the magnetic head core halves to which the metal magnetic laminated film faces. magnetic head.