JPS60261005A - Magnetic head - Google Patents

Abstract

PURPOSE:To improve the linearity of a working gap part and to execute excellent recording and reproduction by forming thin magnetic metallic films in the butt parts of the working gap between the cores of a magnetic head and constituting the working gap part of such thin films. CONSTITUTION:A pair of half blocks 18, 18' for magnetic head cores are constituted by sandwiching and fixing plural sheets of thin magnetic metallic sheets 12 to non-magnetic blocks 10, 11 and the thin magnetic metallic films 19, 19' are formed on the surfaces of such blocks on the side to be formed with the working gap including at least the butt parts of the working gap. The butt parts of the working gap are opposed to each other by such films 19, 19', by which the magnetic head 21 is constituted. A crystalline magnetic alloy of Fe-Si, etc. or a ferromagnetic amorphous alloy of Fe-Co-Si-B, etc. is used for the thin magnetic metallic film 12. Ceramics or the like having the coefft. of thermal expansion approximately equal to the coefft. of thermal expansion possessed by the thin magnetic metallic sheets used in the core part is used for the blocks 10, 11.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to a magnetic head suitable for use in combination with a high coercive force magnetic recording medium, and particularly to a magnetic head constructed by laminating thin metal magnetic plates. .

(Prior Art) It is well known that a magnetic head using a metallic magnetic material having a high saturation magnetic flux density is suitable for use in combination with a high coercivity magnetic recording medium. However, due to the low specific resistance of metal magnetic materials and large overcurrent loss, the effective magnetic permeability at high frequencies is lower than that of conventional high permeability ferrite materials, resulting in a problem that the reproduction efficiency of magnetic heads using this material is low. Ta. In order to solve this problem, we created a multilayer magnetic structure by making the metal magnetic material thinner and using blocks stacked with insulating layers in between.

Configuring a code has become an effective means.

For example, as shown in FIG. 2, a magnetic head using metal magnetic thin plates is made by sandwiching and fixing a plurality of metal magnetic thin plates 12 to blocks 10 and 11 made of non-magnetic material to create a composite flock 13, which is then completely processed. Then, a laminated magnetic heald 14 as shown in FIG. 3 is produced. In this case, the track width is defined by the total sum of the laminated metal magnetic thin plates. 15 is a non-magnetic layer for regulating the gap length, and 16 is a coil winding window.

However, in the above magnetic head, as shown in FIG.
) shows the sliding surface structure of the head, a plurality of metal magnetic thin plates 12 are bonded and laminated in the thickness direction with a non-magnetic material such as resin or glass, and an adhesive layer 1 between the metal magnetic thin plates 1
A problem arises in that the thickness of 7 becomes non-uniform. The thickness of this adhesive layer 17 can be several microns or more, and in such laminated blocks, dimensional errors of the can members accumulate, resulting in poor dimensional accuracy of the finished magnetic head, such as track width. There is a problem. Also.

Since this adhesive layer 17 is made of a non-magnetic material, there arise problems such as a decrease in the effective track width and a decrease in S/N as a whole. On the other hand, when dividing the laminated block 13 into two to form a set of head cores and mirror-polishing the surfaces that will form the two working gaps, the metal magnetic material is fragile, so an enlarged view of the vicinity of the working gap is shown in FIG. 4(b). As shown in FIG. 9, the metal magnetic thin plate 12 at the abutting portion of the 9-operation gap may be plastically deformed, cracked, or chipped. This has problems in that it impairs the accuracy of the gap length and also impairs the linearity of the actuating gear and the abutting portion, deteriorating the recording and reproducing characteristics of the resulting magnetic head.

(Purpose of the invention) The object of the present invention is to eliminate the above-mentioned conventional drawbacks.

The object of the present invention is to provide a magnetic head that has good linearity in the working gap abutting portion, exhibits excellent recording and reproducing characteristics, and is suitable for use in combination with a high coercive force magnetic recording medium.

(Summary of the Invention) The gist of the present invention is that the core part is made of one or more laminated metal magnetic thin plates, and in the magnetic field, an operation including at least an operation gap abutting part of a pair of magnetic core half-dead blocks is provided. By forming a metal magnetic thin film on the gap forming side surface by vapor deposition or slatting, and forming the actuating cap portion by brushing the metal magnetic thin film, an actuating gap portion with excellent linearity is secured, and the gear ?
The aim is to highly precisely regulate the dimensional accuracy of the trunk length, trunk width, etc.

(Embodiments of the Invention) A magnetic head of the present invention will be described in detail below with reference to embodiments.

FIG. 1 shows an embodiment of a magnetic head according to the present invention. Note that the same components as those of the conventional magnetic head shown in FIG. 3 are denoted by the same reference numerals.

Here, a pair of magnetic head core half blocks in which a plurality of metal magnetic thin plates 12 are sandwiched and fixed to non-magnetic blocks 10 and 11 are attached to the surface on the side where the actuating gear and valve are formed, including at least the actuating gap abutting portion of the pair of magnetic head core half blocks. Metal magnetic thin film 1
9 and 19' are formed, and the metal magnetic thin film 19
and 19', the actuating gear and the abutting portion face each other 9
A magnetic head 21 according to the present invention is constructed.

In the present invention, the metal magnetic thin film 12 is Fe-8i based.

Crystalline magnetic alloys such as Fe-8i-At, Fe-At, and Fe-Ni, or Fe-Co-8i-
Ferromagnetic amorphous alloys such as B-based, Oo-MoLZr-based, and Co=Nb-Zr-based alloys are used. In addition, the non-magnetic blocks 10 and 11 are made of various ceramics, clays, glasses, non-magnetic materials, or ferrites whose Curie temperature is below room temperature. There is no particular limitation on the material as long as it has a non-magnetic material, and non-magnetic metals can also be used. on the other hand,
The magnetic material forming the metal magnetic thin films 19 and 19' may be the same as the first magnetic material forming the metal magnetic thin plate of the core portion,
Alternatively, the number may be six using a second magnetic material having a higher saturation magnetic flux density.

FIG. 5 is a diagram showing the structure of the magnetic recording medium sliding surface of the magnetic head according to the present invention in the vicinity of the working gap.

As shown in FIG. 5(a), the metal magnetic thin films 19 and 19' constituting one working gap are uniformly deposited to a desired track width or slightly larger width and a predetermined thickness by vapor deposition or slatting. It is formed into. In this way, the metal magnetic thin films 19 and 19' are formed on the surfaces of the metal magnetic thin plate laminated cores 20 and 20' facing the working gap.

The laminated adhesion interval of the metal magnetic thin plates 12 at the working gap abutting portion is magnetically eliminated, and the effective track width does not decrease. Furthermore, the track width is determined by the metal magnetic thin film 19.
and 19', a magnetic head with high track width accuracy can be easily obtained.

one! Ta. As shown in FIG. 5(b), which is an enlarged view of the abutting portion of the operating gap, the metal magnetic thin plate laminated cores 20 and 20'
The butt part of the operating gap may be plastically deformed.

Even if unevenness occurs due to cracking or chipping, the actuating gap abutting portion is completely covered by the metal magnetic thin films 19 and 19', and one actuating cap portion is constructed with the metal magnetic thin film interposed therebetween. Therefore, the obtained magnetic head has excellent linearity in the working gap portion and also has high gap length accuracy.

(Effects of the Invention) As described above, according to the present invention, in a magnetic head whose core portion is made of a metal magnetic thin plate, a metal magnetic thin film is formed on the operating gap abutting portion of the core of the magnetic head, and the metal magnetic thin film Since the operating gap portion is configured by the following, the dimensional accuracy of track width, gap length, etc. can be regulated with high precision, and the linearity of the first operating cap portion is good and excellent. A magnetic head having E recording and reproducing characteristics and suitable for use in combination with a high coercivity magnetic recording medium can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a magnetic head showing an embodiment of the present invention, FIG. 2 is a perspective view of a conventional composite block made of a metal magnetic thin plate and a non-magnetic material, and FIG. 3 is a magnetic head obtained from the composite block. Perspective views showing the head, FIGS. 4(a) and (b)
) is a plan view showing the structure of the magnetic recording medium sliding surface of the magnetic head, and FIGS. 5(a) and 5(b) are plan views showing the structure of the magnetic recording medium sliding surface of the embodiment head. 10.11: Non-magnetic block, 12: Metal magnetic thin plate. 13: Composite block, 14.21: Magnetic head, 15
: gap regulation layer, 16: coil winding window, 17: laminated adhesive layer, 1s, ts': magnetic head core half block. 19.19': metal magnetic thin film, 20, 20': metal magnetic thin plate laminated core. Agent Patent Attorney Akio Takahashi Figure 1 Figure 2 Figure 3

Claims (3)

[Claims] (1) In a magnetic head in which the core portion is composed of one or more laminated metal magnetic thin plates, metal is applied by vapor deposition or sputtering to the surface of a pair of magnetic head core half-blocks on the working gap forming side, which includes at least the working gap abutting part. 1. A magnetic head characterized in that a magnetic thin film is formed, and an operating gear and a tap portion are formed through the metal magnetic thin film. (2) The magnetic head according to claim 1, wherein the metal magnetic thin film of the core portion and the metal magnetic thin film of the working gap abutting portion are made of the same magnetic material. (3) The metal magnetic thin film of the working gap abutting portion is made of a second magnetic material having a higher saturation magnetic flux density than the first magnetic material forming the metal magnetic thin plate of the core portion. Magnetic heald as described in section.