JPH0461609A - Magnetic head - Google Patents

Abstract

PURPOSE:To prevent the deterioration in a recording/reproducing characteristic by providing a laminated film consisting of a first ferromagnetic metallic film and a non-magnetic film on one magnetic core half body, and butting a second ferromagnetic metallic film to the other magnetic core half body through a non-magnetic material which becomes a magnetic gap. CONSTITUTION:One magnetic core half body is provided with a laminated film 7 consisting of a first ferromagnetic metallic film 5 and a non-magnetic film 6, and in an end face 7a of the gap forming side of the laminated film 7, second ferromagnetic metallic films 141, 142 are formed, and second ferromagnetic metallic films 141, 142 are butter to th other magnetic core half body through a non-magnetic material which becomes a magnetic gap 10. Accordingly, since a first ferromagnetic metallic film 5 consists of the laminated film 7 insulated and separated by the non-magnetic film 6, a high frequency loss caused by an eddy current is reduced, and also, since second ferromagnetic metallic films 141, 142 are stuck and formed on the end face of the gap forming side of the laminated film 7, the non-magnetic film 6 for constituting the laminated film 7 does not exist in the vicinity of the gap, and substantial track width becomes equal to virtual track width. In such a way, the high frequency characteristic and the recording/reproducing efficiency are improved.

Description

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

(b) Prior Art In recent years, ferrite materials with low high frequency loss have been used as magnetic materials for video heads in magnetic recording and reproducing devices such as VTRs that record and reproduce high frequency signals. However, in recent years, high-quality VTRs and digital VTRs
The development of systems that handle wider-band signals, such as A shift is being made to high coercivity media such as metal-deposited media. On the other hand, in a ferrite head, the maximum magnetic flux density is about 5,000 Gauss at most, and in order to efficiently reproduce short wavelength signals, it is necessary to have a narrow gap. In high coercive force media, the ferrite core at the tip of the gap becomes saturated and sufficient recording cannot be performed. Therefore, magnetic heads are being developed using metal materials such as sendust and amorphous magnetic alloys, which have a high maximum magnetic flux density.However, using bulk metal magnetic materials causes large high-frequency losses due to eddy currents. Various heads have been proposed that use a laminated film of a metal magnetic film and a nonmagnetic film that have low current loss.

Conventionally, as this type of magnetic head, for example, Japanese Patent Laid-Open No. 6
0-32107 (GIIB 5/127), etc., magnetic heads using a laminated film are known.

FIG. 33 is a perspective view showing the appearance of a conventional magnetic head, and FIG. 34 is a diagram showing a magnetic medium sliding surface of the conventional magnetic head.

In the figure, (1) and (2) are first and second core members made of ferromagnetic oxide such as Mn-Zn ferrite.

The first and second core members (1) and (2) have track width regulating grooves (11) (11) for regulating the track width of the gap on the end faces on the gap forming side, and an angle θ with respect to the track width direction of the gap. Slanted slopes (8) (8) are formed. On the slopes (8) (8) of the first and second core members (1) (2) on the gap forming side, there are first ferromagnetic metal films (5) (5) made of Sendust etc. and S+Os etc. Laminated films (7) (7) are formed by alternately laminating non-magnetic films (6) (6), which cover the first and second magnetic core halves (3) (4'), respectively. Configure. The entire end surfaces (7a) (7a) on the gap forming side of the laminated films (7) (7) of the first and second magnetic core halves (3) (4') are made of a material such as Sin, which forms the gap. A non-magnetic material with a thickness of 0.1 μm is deposited. Above track width regulation groove (11) (11)
Welded glass with excellent wear resistance (21) (21) (
Softening point: 480°C). 1st and 2nd above
The magnetic core halves (3) and (4) are bonded and fixed with the end surfaces (7a) (7a) on the gap forming side of the laminated films (7) (7) being butted against each other via the non-magnetic material, A magnetic gap (10) is formed at the junction. The above-mentioned joining is performed by melting and assimilating the above-mentioned welded glasses (21) (21). The second magnetic core half (4) has a winding (2
2) A winding groove (13) is formed in which (22) is wound.

(c) Problems to be Solved by the Invention In the conventional magnetic head described above, the width T of the end surfaces (7a) (7a) on the gap forming side of the laminated films (7) (7) is the apparent width of the magnetic gap (10). Track width. The actual track width of the magnetic gap (10) for recording and reproducing is:
Non-magnetic films (6) (6) constituting the laminated films (7) (7)
) is not magnetized, so the above non-magnetic film (6)
It becomes smaller than the apparent track width T by (6).

For example, the non-magnetic film (6) exposed on the end face (7a) (7a) on the gap forming side of the laminated film (7) (7)
When (6) has a film thickness of 0.2 μm and has four layers, the actual track width for recording and reproducing is the width of the end face (7a) (7a) on the gap forming side of the laminated film (7) (7), That is, from the apparent track width T, 0.2X4/s in6μ
m becomes smaller. Therefore, a problem arises in that the recording and reproducing efficiency decreases due to the substantial decrease in track width. Furthermore, when reproducing a magnetic medium recorded with the magnetic head having the above structure, if a track misalignment occurs because the portion of the magnetic medium corresponding to the nonmagnetic film (6) (6) is not completely magnetized, There was also the problem that the recording and reproducing efficiency further deteriorated.

Therefore, it is an object of the present invention to provide a magnetic head that does not substantially reduce the track width, has excellent high frequency characteristics, and has good recording and reproducing efficiency.

(d) Means for Solving the Problems Therefore, the present invention has been made in view of the above-mentioned problems, and comprises a pair of magnetic core halves, at least one of the magnetic core halves of the pair of magnetic core halves. The half body includes a laminated film consisting of a first ferromagnetic metal film and a nonmagnetic film, a second ferromagnetic metal film is formed on the end face of the laminated film on the gap forming side, and the second ferromagnetic metal film is A magnetic head is provided in which the magnetic head is butted against the other magnetic core half through a non-magnetic material that forms a magnetic gap.

(e) According to the present invention, since the first ferromagnetic metal film is composed of a laminated film insulated and separated by a non-magnetic film, high frequency loss due to eddy current can be reduced, and the gap formation side of the laminated film can be reduced. Since the second ferromagnetic metal film is deposited on the end face, there is no non-magnetic film constituting the laminated film in the vicinity of the gap, and the actual track width becomes equal to the apparent track width.

(f) Example Hereinafter, a first example 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 the first embodiment;
FIG. 2 is a diagram showing the media sliding surface of the magnetic throat of the first embodiment, and the same parts as in the conventional example are given the same reference numerals and their explanations are omitted.

In the magnetic head of the first embodiment, sendust or the like is applied to the end surfaces (7a) (7a) on the gap forming side of the laminated films (7) (7) of the first and second magnetic core halves (3) (4). A second ferromagnetic metal film (141) (142) is deposited to a thickness of 3 to 6 μm. The second ferromagnetic metal film (141) (1
42) There is a 0.1 μm thick Si layer on the top surface to form a gap.
A non-magnetic material made of O3 or the like is deposited. The first and second magnetic core halves (3) and (4) are bonded and fixed with the second ferromagnetic metal films (141 and 142) butted against each other through the non-magnetic material, and the bonded A magnetic gap (10) is formed in the section.

Next, a method of manufacturing the magnetic head of the first embodiment will be described with reference to FIGS. 3 to 19.

First, first and second substrates (15) (16) made of a ferromagnetic oxide such as Mn-Zn ferrite with a thickness of 1.3 mm
) is prepared, and the upper surfaces of the first and second substrates (15, 16), which will be the end surfaces on the gap forming side, are mirror-finished.

The first and second substrates (15) and (16) are base materials for the first and second core members (1) and (2), respectively. after that,
As shown in FIGS. 3 and 4, the first and second substrates (
1s) A plurality of inclined grooves (23) (23) having slopes (8) (8) are formed by machining at a constant pitch on the upper surface of (16).

In the next step, as shown in FIG. 5 and FIG.
, a 5 μm thick first ferromagnetic metal film (5) (5) made of sendust and Sin, on the upper surface of the second substrate (15) (16);
The first ferromagnetic metal film (
5) Form a laminated film (7) (7) having a six-layer structure in which (5) is insulated and separated by the nonmagnetic films (6) (6). Furthermore, protective films (17) (17) such as 5ift are deposited and expanded to a thickness of 1 μm over the entire upper surface of the laminated films (7) (7). still,
In the figure, the number of laminated films (7) (7) is not shown accurately.

In the next step, as shown in FIG. 7 and FIG.
, inclined grooves (23) (23) of the second substrate (15) (16)
The welded glass (21) (21) is covered with the protective film (17) (1) so that the welded glass (21) (21) is filled inside the welded glass (21) (21).
7) Form over the entire area above.

In the next step, as shown in FIGS. 9 and 10, the inclined grooves (23) (23) of the first and second substrates (15) (16) are
) The laminated film (7) (7) and the protective film (17
) (17) and the welded glass (21) (21) remain, the upper surfaces of the first and second substrates (15) and (16) are polished to a mirror finish. Through this step, the end surfaces (7a) (7a) of the laminated films (7) (7) on the gap forming side are connected to the first and second layers.
It is exposed on the top surface of the substrates (15) and (16).

In the next step, as shown in FIGS. 11 and 12, second ferromagnetic metal films (141) (1, 42)
is deposited to a desired thickness by sputtering or the like, and then a non-magnetic material such as SiO to form a magnetic gap is deposited on the second ferromagnetic metal films (141, 142).

In the next step, as shown in FIGS. 13 and 14, the upper surfaces of the first and second substrates (15) and (16) are etched by ion beam etching to form the laminated films (7) and (7). Etching is performed so that the second ferromagnetic metal films (141) (142) remain on the end faces (7a) (7a) on the gap forming side.

In the next step, as shown in FIGS. 15 and 16, track width regulating grooves (11) (11) are formed on the upper surfaces of the first and second substrates (15) (16) using a dicing saw or the like. do. The track width regulating grooves (11) (11) are formed on the gap forming side end surface (7a) (
7a) and a part of the second ferromagnetic metal film (141) (142) to remove the second ferromagnetic metal film (141) (142).
) is made to match the apparent track width T of the magnetic gap.

Further, a winding groove (13) and a welded glass groove (18) are formed on the upper surface of the second substrate (16) using a dicing saw or the like.

In the next step, as shown in FIG.
The welded glass groove (1
A glass rod made of welded glass (softening point = 480°C) is inserted into 8) (not shown), and the glass rod and the welded glass (21) are melted and solidified at 480°C or higher to form a welded block ( form).

Next, as shown in FIG. 18, the welding block ( ] 9
) with a dicing saw etc., cut the cutting block (2
0) is formed. Thereafter, as shown in FIG. 19, the magnetic medium sliding surface of the cutting block is machined with a radius, and then cut with a dicing saw or the like, and the magnetic medium sliding surface is processed. Thus, the magnetic head shown in FIG. 1 is completed.

In the above magnetic head, the first ferromagnetic metal film (5) (5)
is a laminated film (
7) Since it is a magnetic head consisting of (7), high frequency loss due to eddy current can be reduced, and moreover, the above laminated film (7) (7)
Since the second ferromagnetic metal films (141) (142) are adhered to the end faces (7a) (7a) on the gap forming side, the second ferromagnetic metal films (141) (142) constitute the laminated films (7) (7) in the vicinity of the gap. There is no non-magnetic film (6) (6) and the magnetic gap (1
0) is the substantial track width of the second ferromagnetic metal film (141
) (142), that is, equal to the apparent track width T. Therefore, the recording and reproducing characteristics of the nonmagnetic films (6) (6) constituting the laminated films (7) (7) do not deteriorate.

A second embodiment of the present invention will be described below.

FIG. 20 is a perspective view showing the external appearance of the magnetic head of the second embodiment, and FIG. 21 is a diagram showing the medium sliding surface of the magnetic head of the second embodiment.

In the figure, (31) and (32) are first and second core members.

The first and second core members (31) and (32) are made of a first reinforcing substrate (33a) (33a) made of a non-magnetic material such as crystallized glass and having a thickness of 0.3 mm, and are coated with a first strong material such as sendust. Magnetic metal film (5) (5) and non-magnetic film (6) such as 5iOz (
Laminated films (7) (7) consisting of (6) are deposited. The upper surface of the laminated film (7) (7) is made of Sin.

A protective film (17) (17) is formed to have a thickness of 1 μm, and a second reinforcing substrate (33b) made of crystallized glass or the like and having a thickness of 0.3 mm is formed on the protective film (17) (17). (33
b) are bonded together by an adhesive layer (35) made of high melting point glass or the like. Laminated film of the first and second core members (7) (7)
Second ferromagnetic metal films (1, 41) (142) such as sendust are deposited on the end faces (7a) (7a) on the gap forming side to a desired thickness, and are formed on the first and second magnetic cores, respectively. Half bodies (3) and (4) are formed. Furthermore, a non-magnetic material such as 5iO1, which forms a gap, is deposited to a thickness of 0.1 μm on the upper surfaces of the second ferromagnetic metal films (141) and (142). Welded glass (40) (40) (softening point: 305°C) is formed on its upper surface. The first and second magnetic core halves (3) and (4) are the second ferromagnetic metal films (141 and 142) of the first and second magnetic core halves (3 and 4).
They are bonded and fixed together with the non-magnetic material interposed therebetween, and a magnetic gap (10) is formed at the bonded portion. The aforementioned bonding is accomplished by melting and solidifying the welded glasses (40) (40). In addition, the first magnetic core half (
3) has a welded glass groove (39) filled with the welded glass (40), and the second magnetic core half (4) has a winding around which the winding (22) is wound. A groove (13) is formed.

Next, a method of manufacturing the magnetic head used in the second embodiment will be described with reference to FIGS. 22 to 32.

First, as shown in Fig. 22, a 5μ thick plate is placed on a reinforcing substrate (33) made of a non-magnetic material such as crystallized glass with a thickness of 1 mm.
A first ferromagnetic metal magnetic film (5) made of Sendust, etc., and a non-magnetic film (6), made of 5ift, etc., each having a thickness of 0.2 μm are alternately laminated in four layers by sputtering or the like, resulting in a lamination of a film thickness of 20.6 μm. A film (7) is deposited. Furthermore, the laminated film (7)
A protective film (] 7) of 1 μm thick, such as Sin, is formed over the entire upper area, and high melting point glass (softening point 670° C.) is further coated on the protective film (17) by screen printing. An adhesive layer (35) is formed and a block (36) is produced.

Next, a plurality of the laminated blocks (36) are prepared so that the lower part of the reinforcing substrate (33) of one laminated block (36) faces the laminated film (7) of the other laminated block (36). After that, the adhesive layer (35) is melted and solidified by heating to join the laminated blocks (36) to form an adhesive block (3z) as shown in FIG. 23. After this, the broken line AA′ shown in FIG.
A pair of core blocks (38) as shown in FIG. 24 are created by cutting the core blocks along the lines using a dicing saw or the like, and then polishing the cut surfaces. Through this step, the gap forming side end surfaces (7a) (7a) of the laminated films (7) (7) are formed.
is exposed on the upper surface of the core block (38).

Thereafter, as shown in FIG. 25, one of the core blocks (38a) of the pair of core blocks (38) (38) is
), that is, the end face on the gap forming side of the core block (38a), a welded glass groove (39) is formed using a dicing saw or the like. On the other hand, as shown in FIG. 26, the other core block (38b) has a winding (22).
A winding groove (13) is formed in which the wire (22) is wound.

Next, as shown in FIGS. 27 and 28, a second ferromagnetic metal film (141) such as sendust is applied to the entire area of the gap forming side end surfaces of the pair of core blocks (38a) (38b).
(142) is deposited and formed to a desired thickness.

Thereafter, as shown in FIGS. 29 and 30, the upper surfaces of the pair of core blocks (38a) (38b) are etched by ion beam etching or the like to form the laminated films (7) (7).
The second ferromagnetic metal films (141) and (142) are etched so as to remain only on the end faces (7a) and (7a) on the gap forming side. After that, the core block (38a) (38b
) that forms a gap over the entire area on the end face on the gap forming side
10! A non-magnetic material having a thickness of 0.1 μm is formed by sputtering or the like.

After that, as shown in FIG. 31, the core block (38
The core block (38a) (38b) is filled with adhesive glass (40) made of low melting point glass (softening point: 305°C) into the welded glass groove (39) formed on the end face on the gap forming side of a). is formed over the entire end face on the gap forming side.

Finally, as shown in FIG.
The welded glass (40) is melted and solidified to form a joined core block (42) in a state where they are abutted against each other with the non-magnetic material forming the gap interposed therebetween. After that, the joining block (42) is connected to the broken line B in FIG.
-B' and broken line C-C-, the magnetic head of the second embodiment is completed by cutting the magnetic head using a dicing saw or the like, polishing the sliding surface, and winding the magnetic head as shown in FIG. The reinforcing substrate (33) is divided into reinforcing substrates (33a) and (33b) by dividing along this broken line B-B'.

Also in the magnetic head of the second embodiment described above, the magnetic gap (10) is formed between the nonmagnetic films (6) (6) of the first and second magnetic core halves (3) (4). , the same effects as the magnetic head of the first embodiment can be obtained.

In addition, in the above-mentioned first and second embodiments, both the first and second magnetic core halves (3) and (4) have a laminated film (7×7),
Even in a magnetic head having a structure in which the laminated film (7) is provided only on one of the magnetic core halves, the same effects as in the above embodiment can be obtained.

(g) Effects of the Invention According to the present invention, it is possible to provide a magnetic head that has excellent high frequency characteristics and prevents deterioration of recording and reproducing characteristics due to a decrease in the substantial track width of the magnetic gap relative to the apparent track width.

[Brief explanation of drawings]

1 to 19 relate to the first embodiment of the present invention.
The figures are perspective views showing the magnetic head, FIG. 2 is a view showing the medium sliding surface of the magnetic head, FIGS. 3, 4, 5, 6,
Figure 7, Figure 8, Figure 9, Figure 10, Figure 11, Figure 12
Fig. 13, Fig. 14, Fig. 15, Fig. 16, Fig. 17
18 and 19 are perspective views showing a method of manufacturing a magnetic head, respectively. 20 to 32 relate to a second embodiment of the present invention, in which FIG. 20 is a perspective view showing a magnetic head, FIG. 21 is a diagram showing a medium sliding surface of the magnetic head, and FIG. 22 is a perspective view showing a magnetic head.
Figure, Figure 23, Figure 24, Figure 25, Figure 26, Figure 27
Figures 28, 29, 30, 31 and 3
FIG. 2 is a perspective view showing a method of manufacturing each magnetic head. 33 and 34 relate to a conventional example, in which FIG. 33 is a perspective view showing a magnetic head, and FIG. 34 is a diagram showing a medium sliding surface of the magnetic head. (3)...First magnetic core half, (4)...Second magnetic core half, (5)...First ferromagnetic metal film, (6)...
・Nonmagnetic film, (7)...Laminated film, (7a)...Gap formation side end face of the stacked film, (10)...Magnetic gap, (141) (142)...Second strong magnetic metal film. Figure 1 Figure 19 Figure 20 - Figure A Figure 31 Figure Duck 1 Figure 28 Figure 32 Procedural amendment (voluntary) August 10, 1990 1. Case description Heisei Patent Application No. 168804 2. Name of the invention Magnetic C 3° Person making the amendment Relationship to the case Name Patent applicant Sanyo Electric Co., Ltd. 4° Agent address 2-18 Keihan Hondori, Moriguchi City Contact information: t! (Higashiya) For intellectual property reasons, "Fig. 34" of the drawing of the outpost of the Litter will be amended as shown in the attached sheet. More than that

Claims (1)

[Claims] (1) Consisting of a pair of magnetic core halves, at least one of the pair of magnetic core halves includes a laminated film consisting of a first ferromagnetic metal film and a nonmagnetic film, and the laminated film A second ferromagnetic metal film is formed on the end face on the gap forming side of the magnetic head, and the second ferromagnetic metal film is butted against the other magnetic core half through a nonmagnetic material that forms a magnetic gap.