JPH0461012A - Magnetic head - Google Patents

Abstract

PURPOSE:To improve the track width accuracy of a magnetic gap and to execute good recording and reproducing even in a high-frequency region by joining and fixing a 1st core half body and a 2nd core half body while the end face of 1st laminated thin films and the front surface of a 3rd ferromagnetic metallic thin film are held butted on each other via a nonmagnetic material to constitute a magnetic gap. CONSTITUTION:The width of the end face of the 1st laminated thin films 16 exposed on the gap forming surface is set equal to the desired track width of the magnetic gap 27 and the width of the gap butt part of the 2nd ferromagnetic metallic thin film 25 of the 2nd core half body 12b is set larger than the desired track width of the magnetic gap 2 in the case of forming a core block 32 by butting the 1st, 2nd core half body blocks 30a, 30b by melting and solidifying a glass layer 26 in the state in which the end face 31 on the gap forming side of the 1st core half block 30a and the glass layer 26 face each other. The track width of the magnetic gap 27 is set exactly by the film thickness of the 1st laminated thin films 16 at all times in this way and the good recording and reproducing are executed even in a high-frequency region.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a magnetic V-drive suitable for efficiently recording and reproducing high frequency signals.

(b) Prior Art Conventionally, in devices for recording and reproducing high frequency signals such as VTRs, ferrite materials with low high frequency loss have been used as magnetic materials for video ends. However, in recent years, the development of systems that handle even wider band signals, such as high-quality VTRs and digital to 7TRs, has become active, and recording media have also become denser to record such large amounts of information. In this trend, there is a shift from iron oxide based media to high coercive force media such as alloy powder media and metal evaporated media. On the other hand, in ferrite heads, the maximum magnetic flux density is at most 5
000 Gauss, and in order to efficiently reproduce short wavelength signals, it is necessary to make the gap narrow, and in the case of a high coercive force medium with a coercive force Ha of 10000e or more as mentioned above, the ferrite core at the tip of the gap becomes saturated. However, sufficient records cannot be recorded. Therefore, we have developed magnetic materials using metal magnetic materials such as sendust and amorphous magnetic alloy, which have a high maximum magnetic flux density! I'm tired.

Conventionally, in order to eliminate such drawbacks, for example, Japanese Patent Application Laid-open No. 6
A multilayer magnetic head for high frequency has been proposed as disclosed in Japanese Patent No. 2-33309 (G11B5./147C).

This magnetic head consists of a non-magnetic substrate (1
)(]') A pair of first and second cores, between which a laminated thin film (4) of a ferromagnetic metal thin film (2) such as Sendust and an insulating thin film (3) such as SIO is adhered. Half (5a) (
It is formed by abutting the end faces of the laminated thin films (4) (4) of 5b) with a non-magnetic material (7) serving as a magnetic gap (6) interposed therebetween. One of the first core halves (5a, 5b) of the pair of first and second core halves (5a)
A winding groove (8) is formed in a).
) is wound with a winding (9). The gap length of the magnetic gap (6) is determined by the thickness of the non-magnetic material (7), and the gap width is determined by the thickness of the portion where the end surfaces of the laminated thin films (4,) (4) abut against each other. do.

However, in the conventional magnetic head described above, it is difficult to accurately abut the end surfaces of the laminated thin films (4×4) of the first and second core halves (5a) (5b), and the magnetic gap (6) It is difficult to define the track width with high precision.

As a magnetic head that eliminates the above-mentioned drawbacks, for example, Japanese Patent Application Laid-Open No. 63-269310 (GLIB5/127
), etc.

As shown in FIG. 9, this magnetic head has a first core half (5a) in which a winding groove (8) is formed, and a non-magnetic substrate (1) as in the magnetic head shown in FIG. ) (1') In contrast to the structure in which a laminated thin film (4) is formed between
The second core half (5b) has a single-layer ferromagnetic metal thin film (1
1) is deposited, and a non-magnetic thin film (7) serving as a gap spacer is deposited on the ferromagnetic metal thin film (11). The first and second core halves (5a) and (5b) are bonded and fixed in a state where the end face of the laminated thin film (4) and the upper face of the non-magnetic thin film (7) are brought into contact with each other, and a magnetic gap (6) is formed.
is formed. In this magnetic field, the width of the magnetic gap (6) is the width of the first and second core halves (5a) (
Regardless of the alignment accuracy of 5b), the laminated thin film (4)
The tracking accuracy can be greatly improved.

However, even in a magnetic head with this structure, when recording and reproducing in a high frequency region, it is necessary to reduce the thickness of the ferromagnetic metal thin film (11) of the second core half (5b).
Conversely, if the ferromagnetic metal thin film (11) becomes thin, the thin film (11) quickly becomes magnetically saturated, causing a problem that good recording cannot be performed.

(c) Problems to be Solved by the Invention The present invention has been made in view of the drawbacks of the above-mentioned conventional examples.
It is an object of the present invention to provide a magnetic head that has high tracking accuracy of a magnetic gap and can perform good recording and reproduction even in a high frequency range without causing magnetic saturation.

(d) Means for Solving the Problems The present invention comprises a first ferromagnetic metal thin film and an insulating thin film between a pair of non-magnetic substrates, the first laminated thin film having a thickness equal to the desired trunk width of the magnetic gap. a first core half on which is deposited and the end face of the laminated thin film is exposed on the end face on the gap forming side, and a groove on the end face on the gap forming side of the non-magnetic material on the side opposite to the medium sliding contact surface. A second laminated thin film comprising a second ferromagnetic metal thin film and an insulating thin film, the upper surface of which is flush with the end surface on the gap forming side of the non-magnetic material, is deposited in the groove; a second core half on which a third ferromagnetic metal thin film having a width larger than the thickness of the first laminated thin film is deposited on the second laminated thin film; The second core half is bonded and fixed in a state where the end face of the first laminated thin film and the upper face of the third ferromagnetic metal thin film are brought into contact with each other with a non-magnetic material forming a magnetic gap. do.

(E) Effect According to the above configuration, even if some misalignment occurs in the abutment between the first core half and the second core half, the end face of the first laminated thin film of the first core half , whose entire width abuts against the third ferromagnetic metal thin film of the second core half through a non-magnetic material, the width of the end face of the laminated thin film becomes the track width of the magnetic ganob, and the second core half (by the second laminated thin film), eddy current loss is suppressed even in the high frequency range,
Moreover, magnetic saturation does not occur in this part.

(F) Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing the appearance of the magnetic head of this embodiment.

In the figure, (12a) and (12b) are first and second core halves, one of which, the first core half (12a), is a nonmagnetic substrate (13) made of crystallized glass, nonmagnetic ceramic, etc.
A first ferromagnetic metal thin film (14) with a film thickness of 5 gm such as Sendust and an insulating thin film (14) with a film thickness of 0.1 μm such as 8102 are placed on top.
A first laminated thin film (16) consisting of 5) is deposited on the first laminated thin film (16), and a high melting point glass layer (17) acting as an adhesive is applied to the crystallized glass. , a non-magnetic substrate (13°) made of non-magnetic ceramic 7, etc. is bonded and fixed. A winding il! is provided on the end face of the first core half (12a) on the gap formation side. (18) is formed.

Further, the second core half (12b) includes crystallized glass,
The first core half (12a) is made of non-magnetic ceramic or the like.
) of the end face on the gap forming side of the non-magnetic material (19) with the same thickness as the side opposite to the media sliding contact surface (back/back gap side)
A groove (21) having a slope (20) is formed in the groove.

In the groove (21), a second film of Sendust or the like having a thickness of 5 μm is placed.
The film thickness of ferromagnetic metal thin film (22) and Sin, etc. is 0.1μ.
a second laminated thin film (24) consisting of an insulating thin film (23) of m
) is deposited. The gap forming side end face (191) of the non-magnetic material (19) and the second laminated thin film (2
4) is flush with the top surface (241), and the end surface (191)
) to the upper surface (241) of the second laminated thin film (24), a third ferromagnetic metal thin film (25) made of sendust or the like and having a thickness of 5 μm is deposited. A low melting point glass layer (non-magnetic material) (26) for use as a gap spacer is deposited on the third ferromagnetic metal thin film (25).

The first and second core halves (1, 2a) (12b) are joined with the end surface of the first core half (12a) on the Ganob formation side and the glass layer (26) abutting each other. te3
This bonding is achieved by melting and assimilating the glass layer (26). The glass layer (26) has a magnetic gap (
27), the cap length of the magnetic gear knob (27) is equal to the thickness of the glass layer (17), and the trunk width is equal to the thickness of the first laminated film (16).

Next, a method of manufacturing the magnetic head of the above embodiment will be explained.

First, as shown in FIG. 2, a first laminated layer consisting of a first ferromagnetic metal thin film (14) and an insulating thin film (15) with a film thickness equal to the desired track width is formed on the upper surface of the nonmagnetic substrate (13). A plurality of laminated substrates (components) each having a thin film (16) and a high melting point glass layer (17) formed by sputtering or the like are bonded and fixed by the glass (17) to form a laminated block (2).
9).

Next, move the laminated block (29) along the broken line AA'.
to form a first core half block (30a), and then cut the first core half block (30a) as shown in FIG.
The cut surface of a), that is, the end surface (+61) of the laminated thin film (16)
A winding groove (18) is formed on the end face (31) on the gap forming side where the wire is exposed.

On the other hand, as shown in FIG. 4, the first core half block (30a) is made of crystallized glass, non-magnetic ceramic, etc.
A rectangular non-magnetic material (19) with a size corresponding to the size of the non-magnetic material (19) is prepared. A groove (21) having a slope (20) is formed on the side opposite to (192).

Next, as shown in FIG. 5, a second laminated thin film (24) consisting of a second ferromagnetic metal thin film (22) and an insulating thin film (23) is placed in the groove (21). ) top surface (2
41) is formed flush with the end surface (191) of the non-magnetic material (19) on the gap forming side. After forming the second laminated thin film (24) on the entire upper surface of the non-magnetic material (19), the second laminated thin film (24) is attached to the end face (on the gap forming side) of the non-magnetic material (19).
191) is removed by polishing, etching, etc. until it is exposed.

Next, as shown in FIG. 6, the second laminated thin film (
24) A third ferromagnetic metal thin film (25) is deposited over the upper surface (241), and a gap spacer glass layer (26) is coated on the ferromagnetic metal thin film (25) by sputtering or the like. The second core half block (30b
) to form.

Next, the first core half bronc (3t) a) shown in FIG.
and a second core half-bronch (30b) shown in FIG. The end face (31) on the gap forming side of (30a) and the glass 1it (26) are brought into contact with each other while facing each other, and the glass layer (26) is melted and solidified to join to form a core block (32). .

Next, the core block (32) is cut along the broken line BB' to form a plurality of hent chips, and the head chip is subjected to external processing such as rounding of the media sliding surface, and winding grooves are formed on the head chip. Winding wires (33) and (33) are wound through (18) and the first
The magnetic head of this example shown in the figure is formed.

In the magnetic head of this embodiment as described above, the thickness of the first laminated thin film (16) of the first core half (12a), that is, the first laminated thin film (16) exposed on the gap forming surface is ) is equal to the desired trunk width of the magnetic gap (27), and the width of the gap abutting portion of the second ferromagnetic metal thin film (25) of the second core half (1, 2b) is equal to the desired trunk width of the magnetic gap (27). 27), the first,
Even if the second core halves (12a) and (12b) are misaligned, since the magnetic gap (27) is formed on the end face of the laminated thin film (16), the magnetic gap (
The trunk width of 27) is always the same as that of the first laminated thin film (16).
It is precisely defined by the film thickness.

In addition, in the above-mentioned magnetic helix, the second core half (12b)
Since the magnetic path is formed by the second laminated thin film (24), magnetic saturation does not occur even in the high frequency range, eddy current loss can be suppressed, and deterioration of recording and reproducing characteristics can be prevented. Further, the second laminated thin film (24) is not exposed on the medium sliding contact surface, and the insulating thin film (24) of the second laminated thin film (24) is not exposed.
3) does not act as a pseudo gap.

(G) Effects of the Invention According to the present invention, it is possible to provide a magnetic head that has improved trunk width precision of the magnetic gap and can perform good recording and reproduction even in a high frequency region.

[Brief explanation of drawings]

Figures 1 to 6 relate to the present invention; Figure 1 is a perspective view showing the external appearance of the magnetic helix; Figures 2, 3, 4, 5, 6, and 7; 2A and 2B are perspective views showing a method of manufacturing a magnetic head, respectively. FIGS. 8 and 9 are perspective views showing the appearance of conventional magnetic heads, respectively. (12a)...first core half, (12b)...second core half
Core half, (13) (13')...Nonmagnetic substrate, (1
4)...first ferromagnetic metal thin film, (15)(23).
...Insulating thin film, (16)...First laminated thin film, (19
)...Nonmagnetic material, (21)...Groove, (22)...
Second ferromagnetic metal thin film, (24)...Second laminated thin film, (25)...Third ferromagnetic metal thin film, (26)...
・Glass layer (non-magnetic material) (27)...Magnetic gear knob, (191)...End face of gear knob γ type suction side. 1 person, Sanyo Electric Co., Ltd. agent, patent attorney Takuji Nishino (2 others) No. 1 Figure 1' / Figure 4 Figure 8 Figure 9

Claims (1)

[Claims] (1) A first laminated thin film consisting of a first ferromagnetic metal thin film and an insulating thin film and having a thickness equal to the desired track width of the magnetic gap is deposited between a pair of nonmagnetic substrates, and a first layer having an end surface with an end surface of the laminated thin film exposed;
A groove is provided on the side opposite to the medium sliding contact surface of the core half and the end face on the gap forming side of the non-magnetic material, a second ferromagnetic metal thin film and an insulating thin film are formed in the groove, and the upper surface is A second laminated thin film is deposited and formed flush with the end face of the non-magnetic material on the gap forming side, and a third ferromagnetic film having a width larger than the thickness of the first laminated thin film is formed on the second laminated thin film. a second core half on which a metal thin film is deposited, and the first core half and the second core half are connected to the end face of the first laminated thin film and the third ferromagnetic metal thin film. 1. A magnetic head characterized in that the upper surface of the magnetic head is bonded and fixed in a state where the upper surfaces thereof are brought into contact with each other through a non-magnetic material that forms a magnetic gap.