JP2003208704A - Magnetic head and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-quality magnetic head wherein there are no bubbles nor cracks in reinforced glass even when high melting point reinforced glass or gap adhesion glass film is used, and a method for manufacturing the same. <P>SOLUTION: By bonding the gap adhesion glass film 3 of a core half 8 having high melting point reinforced glass 7 on a winding wire window to a chrome layer 4 formed on the other core half 9, adhesive strength is improved, and no cavities are generated in a gap portion. Thus, a high-quality magnetic head is manufactured, in which gap length accuracy is good, and no bubbles nor cracks are present in the reinforced glass 7. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital recording V
The present invention relates to a magnetic head used in a high-density magnetic recording device such as a TR and a data streamer, and a manufacturing method thereof.

[0002]

2. Description of the Related Art In recent years, along with digital recording and miniaturization and high density recording of magnetic recording devices, magnetic heads having a composite metal magnetic film have been widely used, and high precision gap width precision and high reliability are ensured. Improvement of production quality and cost reduction are required.

A conventional magnetic head will be described below.

FIG. 3 is a cross-sectional view of an essential part showing the structure of a conventional magnetic head. In the figure, reference numeral 50 denotes a pair of cores, 40 denotes a pair of cores 50, and a heat treatment temperature 500 at the time of joining is set.
A glass film made of a glass material having a softening point of 600 ° C. or higher that does not change even at 40 ° C., a glass film 41 for bonding the glass film 40 and made of a lead borosilicate-based material having a softening point of 445 ° C., and 42 Reinforcing glass composed of low-melting glass having a softening point of 405 ° C., and 43 is a crack entering the glass film 41 and the reinforcing glass.

The operation of the conventional magnetic head having the above structure will be described below.

In the magnetic head including the metal magnetic film, the heat treatment temperature at the time of joining the core 50 is set to about 500 ° C. as an upper limit in order to prevent deterioration of the magnetic characteristics, and the gap material does not change even at the heat treatment temperature of 500 ° C. at the time of joining. The glass film 40 having a softening point of 600 ° C. or more is used as a spacer material, and the softening point is 40
Bonding is performed with a lead borosilicate glass film 41 at 5 ° C. Further, the reinforcing glass 42 was also bonded and reinforced with a low melting point glass having a softening point of 405 ° C.

However, the glass film 41 for gap bonding having a low melting point and the reinforcing glass 42 having a low melting point are low in strength of the glass themselves, and cracks 43 are likely to occur. Further, the range of the coefficient of thermal expansion is narrow, and it is difficult to match it with the composite magnetic head using the metal magnetic film.

Therefore, a method of increasing the pressure applied to the core 50 at the time of gap bonding and a method of making the pressure applied to the core 50 uniform by using a high melting point gap bonding glass film having a softening point of 435 ° C. or higher are available. It is taken. Further, there is adopted a method of using a reinforced glass having good glass strength and good matching with the core 50 by a method of press-fitting and filling a glass having a high melting point even at a low heat treatment temperature.

[0009]

However, in the above-described conventional magnetic head, when the reinforcing glass 44 having a high softening point shown in FIG. 4 is used, the reinforcing glass 44 shrinks in the temperature rising process during heat treatment when the pair of cores 50 are joined. , Expansion occurs, and the flatness of the gap surface of the reinforcing glass 44 is lost. Therefore, the bonding on the bonding surface becomes incomplete, and the cavity 45 is generated. As the heat treatment temperature further rises and reaches the specified temperature,
The glass film 40 undulates due to the cavities 45 formed as described above, and bubbles 46 are also formed in the reinforcing glass 44 as shown in FIG. As a result, there are problems that cracks 47 occur in the reinforcing glass 44 due to the bubbles 46, and the mechanical strength of the gap portion of the core 50 cannot be obtained.

In view of the above problems, the present invention is a high-quality magnetic head and a magnetic head having a large gap adhesion strength without bubbles or cracks in the reinforcement glass even when a high melting point reinforcement glass or a gap adhesion glass film is used. A method for manufacturing a head is provided.

[0011]

In order to solve the above problems, the magnetic head of the present invention has a pair of winding windows in one half of the core, and a pair of reinforcing glass members in a part of the winding windows. A core half is a magnetic head formed by joining via a gap material, and on the gap surface of the core half having the winding window,
A first gap material in which a non-magnetic film and an adhesive glass film are laminated in this order, and a second gap material in which a non-magnetic film and a chromium layer are laminated in this order on the gap surface of one core half body. And the pair of core halves are joined together by joining the bonding glass film and the chrome layer.

According to such a magnetic head, even if a high melting point reinforcing glass or a gap bonding glass film is used, there are no bubbles or cracks in the reinforcing glass, the gap length accuracy is good, and the gap bonding strength is high. To provide a high magnetic head.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claims 1 to 4 of the present invention has a pair of core halves each having a winding window in one core half body and a reinforcing glass in a part of the winding window. A magnetic head comprising a body joined via a gap material, wherein a nonmagnetic film and an adhesive glass film are laminated in this order on the gap surface of the core half having the winding window. A gap material and a second gap material having a nonmagnetic film and a chrome layer laminated in this order on the gap surface of one core half are provided, and the bonding glass film and the chrome layer are joined together. , The pair of core halves are joined, and by such a configuration,
Even if a high-melting glass is used as the reinforcing glass, the glass film for gap bonding of the core half having the reinforcing glass in the winding window part and the chromium film or the chromium alloy film provided on the other core half are good. Since the adhesive strength is high and the voids generated in the gap are eliminated, it is possible to obtain a high quality magnetic head having no bubbles or cracks in the reinforcing glass.

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a perspective view showing a main part of an embodiment of a magnetic head according to the present invention. In the figure, 8
Is a first core half C-type core, 9 is a second core half I-type core, and is a C-type core 8 and an I-type core 9, respectively.
And constitute a pair of core halves. Reference numeral 6 denotes a ceramic substrate provided on the C-shaped core 8 and I-type 9. Reference numeral 5 denotes a metal magnetic thin film disposed on the upper surfaces of the C-shaped core 8 and the I-shaped core 9. It is distributed.
7 is a softening point of 465 ° C. arranged in a part of the winding window of the C-shaped core 8.
Reinforced glass of B2O3-Zn containing no Pb oxide
Reinforced glass having a composition of O-SiO2-Al2O3-Bi2O3-Na2O may be used. 2 is a C-type core 8 and an I-type core 9
Glass film which is a non-magnetic film formed on the gap surface of
Is a chrome layer composed of a chrome film or a chrome alloy film, and the C-type core 8 and the I-type core 9 are joined via the chrome layer 4. 3 is an adhesive glass film for adhering the chrome layer 4 and the glass film 2 to each other.
Is a gap material arranged at the joint between the C-shaped core 8 and the I-shaped core 9, and the glass film 2, the bonding glass film 3 and the chromium layer 4 constitute the gap material layer 1. Further, the glass film 2 on the C-shaped core 8 side and the bonding glass film 3 constitute a first gap material, and the glass film 2 on the I-shaped core 9 side and the chrome layer 4 constitute a second gap material. is doing.

The operation of the magnetic head of the present embodiment configured as described above will be described below.

On both sides of the metal magnetic thin film 5, a laminated head core reinforced by a ceramic substrate 6 which is a non-magnetic material,
One of the C-shaped cores 8 has a softening point 4 on a part of the winding window.
B ₂ O 3 —ZnO—SiO 2 —Al ₂ O 3 -B, which was provided with a reinforcing glass 7 at 65 ° C. but did not contain Pb or Pb oxide.
Reinforced glass of i2O3-Na2O composition may be used. This C
The mold core 8 is integrated with the other I-shaped core 9 via the gap material layer 1.

The gap material layer 1 is a non-magnetic film having a softening point of 820 ° C./thickness of 45 as a spacer material on the C-shaped core 8.
nm glass film 2 and an adhesive glass film 3 having a softening point of 445 ° C./thickness of 30 nm, and these glass materials are B203-ZnO-S containing no Pb oxide.
A glass film having a composition of iO2-Al2O3-Bi2O3-Na2O may be used. The I-shaped core 9 is composed of the same spacer material having a thickness of 45 nm as the C-shaped core 8 and the chromium layer 4 having a thickness of 30 nm. The two cores 8 and 9 are bonded to each other by the bonding glass film 3 and the chromium layer 4 to form a magnetic head core.

Although the chrome layer 4 is formed on the I-shaped core 9 in this embodiment, it may be formed on the gap surface on the C-shaped core 8 side.

With the above structure, even if a glass having a melting point higher than that of the conventional low melting point glass (softening point 405 ° C.) is used as the reinforcing glass 7, the core having the reinforcing glass 7 in the winding window portion is used. A gap bonding glass film 3 of the half body 8;
Due to the good adhesiveness with the chromium layer 4 or the chromium alloy film provided on the other half core 9, the adhesive strength is high, and the voids generated in the gap are eliminated, so that there are no bubbles or cracks in the reinforcing glass 7. A high quality magnetic head can be obtained.

The experimental results are shown in Table 1 below.

[0022]

[Table 1]

Examination No. of (Table 1) As shown in 10 to 12, when chromium is used as the adhered gap film and the heat treatment temperature at the time of gap bonding is 485 ° C., the softening point of the reinforcing glass 7 is 435 ° C. or more and 465 ° C. or less, the glass for gap bonding. If the softening point of the film 3 is composed of a glass film having a temperature of 445 ° C., bubbles and cracks in the reinforcing glass 7 can be prevented,
The gap junction strength is further improved. In Table 1, those having a gap junction strength higher than that of the conventional technology are indicated by ○.
Indicated by.

On the other hand, in the case where the glass film is used as the adhered gap film (Study Nos. 1 to 8), the softening point of the reinforcing glass and the glass film and the conditions of the gap bonding temperature are the same as the above conditions or the following mathematical formulas. Even if they match, the gap junction strength is equal to or lower than that of the conventional technique. In (Table 1), the gap junction strength equivalent to that of the prior art is indicated by Δ, and the strength lower than that of the prior art is indicated by x.

Even if chromium is used as the adhered gap film, the temperature conditions do not match (Study Nos. 1 and 1).
3, 14), the gap junction strength is weakened.

Here, the softening point of the bonding glass film 3 is T1.
C., when the heat treatment temperature during core joining (gap joining temperature in Table 1) is T2.degree. C., it is in the range of (T2-60) <T1 <(T2 + 30), and the softening point of the reinforcing glass 7 is T3.degree. By setting so as to satisfy the condition of (T3-20) <T1 <(T3 + 35), it is possible to prevent the occurrence of bubbles and cracks in the reinforcing glass 7 and improve the gap bonding strength. It became clear by the experiment.

(Embodiment 2) FIG. 2 shows a method of manufacturing a magnetic head having the structure of Embodiment 1. In the figure, 10 is a metal magnetic thin film, 11 is a non-magnetic substrate, 12 is a core block composed of the metal magnetic thin film 10 and the non-magnetic substrate 11,
Reference numeral 21 denotes a C-shaped core block which is a first core half body manufactured through the respective steps from the core block 12, and 22 denotes an I-shaped core block which is a second core half body joined to the C-shaped core block 21. , 13 is a groove for filling glass, 14 is a groove 13
Reinforced glass to be filled in, 15 is a groove for a winding window, 16 is a core joint surface, 17 is a core joint surface which is a surface of the I-shaped core block 22 to be joined to the C-shaped core block 21, 18
Is a glass film formed on the gap surface of the C-shaped core block 21 and the I-shaped core block 22, 19 is an adhesive glass film formed on the glass film 18 of the C-shaped core block 21, 2
Reference numeral 0 denotes a chrome layer formed on the glass film 18 of the I-shaped core block 22, which is made of a chrome film or a chrome alloy film.

The operation of the method of manufacturing the magnetic head having the above structure according to this embodiment will be described below.

First, a method of manufacturing the C-shaped core block 21 will be described.

In the first step shown in FIG. 2A, Fe-T
a alloy metal magnetic thin film 10 and TiO2-MgO-Ni
O-based non-magnetic substrates 11 are alternately laminated to form a core block 12. The metal magnetic thin film 10 may be Fe-Si type or Co-Nb alloy type. The non-magnetic substrate 11 is Fe2O
A 3-MnO-ZnO-based sintered body or a single crystal body may be used.

Next, in a second step shown in FIG. 2 (b), a glass filling groove 13 is formed in the core block 12 produced in the above-mentioned step (a), and a reinforced glass having a softening point of 465 ° C. 14 is melt-filled at a heat treatment temperature of 485 ° C. The reinforcing glass 14 is B2O3-ZnO-SiO2-Al2O3-Bi.
2O3-Na2O type glass may be used.

Next, in a third step shown in FIG. 2C, the groove 13 filled with the reinforcing glass 14 in the above step (b).
The groove 15 for the winding window is formed in a part of the above, and then the core joint surface 16 is mirror-polished by the diamond lapping method or the like to form the gap surface, and the C-shaped core block 21 is completed.

Next, in a fourth step shown in FIG. 2E, a glass film 18 having a softening point of 820 ° C. and a thickness of 45 nm is formed on the gap surface of the C-shaped core block 21 by a sputtering method.
Further, an adhesive glass film 19 having a softening point of 445 ° C. is formed with a thickness of 30 nm by a sputtering method. Adhesive glass film is B2
O3-ZnO-SiO2-Al2O3-Bi2O3-N
An a2O type glass film may also be used.

Next, a method of manufacturing the I-shaped core block 22 will be described.

First, in the fifth step shown in FIG. 2D, only the core joint surface 17 is mirror-polished to form a gap surface, and in the sixth step shown in FIG. 2F, the gap surface is softened. A glass film 18 at a temperature of 820 ° C. is formed with a thickness of 45 nm by a sputtering method, and a chromium layer 20 is further formed with a thickness of 30 nm by a sputtering method. In this way, the I-shaped core block 22 is completed.

The C-shaped core block 21 and the I-shaped core block 22 produced in the above respective steps are shown in FIG.
C-shaped core block 2 in which the gap material is formed in the step of
The 1 and I-shaped core blocks 22 are butted against each other at the gap surface, and heat-treated at 485 ° C. while pressurizing and holding at a prescribed pressure to bond the pair of core blocks. After that, the outer shape of the core block is adjusted, and the metal magnetic film portion 10 is removed from the core block.
The magnetic head core 30 is completed by cutting into a specified thickness having a track width of.

As described above, according to the present embodiment, since the C-type core block 21 and the I-type core block 22 are joined via the chrome layer 20, the tempered glass during the heat treatment during the joining is strengthened. It is possible to manufacture a magnetic head in which bubbles and cracks are not generated in 14 and the gap junction strength is improved.

In the present embodiment, the chrome layer 2
Although 0 is formed on the I-shaped core block 22 side, it may be formed on the gap surface of the C-shaped core block 21.

[0039]

As described above, according to the present invention, even if a high-melting glass is used as the reinforcing glass, the half-pair gap bonding glass film having the reinforcing glass in the winding window portion and the other glass Good adhesiveness with the chrome layer provided in the core half pair has high adhesive strength and eliminates voids generated in the gap portion, so that a high-quality magnetic head having no bubbles or cracks in the reinforcing glass can be produced.

[Brief description of drawings]

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

FIG. 2 is a perspective view of essential parts showing steps of the method of manufacturing the magnetic head of the embodiment.

FIG. 3 is a cross-sectional view of a main part showing a configuration of a gap and a reinforcing glass portion of a conventional magnetic head.

FIG. 4 is a cross-sectional view of an essential part showing the configuration of a gap junction of a conventional magnetic head.

FIG. 5 is a cross-sectional view of an essential part showing a state in which bubbles and cracks are formed in a conventional magnetic head.

[Explanation of symbols]

3 Gap adhesive glass film 4 chrome layer 5 Metal magnetic film 7 Reinforced glass

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Claims (4)

[Claims] 1. A first core half body having a winding window and a reinforcing glass in a part of the winding window, and a second core half body joined to the first core half body via a gap member. A magnetic head including a core half body, wherein a first gap member in which a nonmagnetic film and an adhesive glass film are laminated in this order on a gap surface of the first core half body, and the second gap member A non-magnetic film and a second gap material laminated in the order of a chrome layer are provided on the gap surface of the core half, and the adhesion glass film and the chrome layer are bonded to each other to form the first and the first gaps. A magnetic head comprising two core halves joined together. 2. When the softening point of the bonding glass film is T1 ° C. and the heat treatment temperature at the time of core bonding is T2 ° C., the range of (T2-60) <T1 <(T2 + 30) is satisfied, and the softening of the reinforcing glass is performed. 2. The magnetic head according to claim 1, wherein when the point is T3 [deg.] C., (T3-20) <T1 <(T3 + 35). 3. The magnetic head according to claim 1, wherein the composition of the adhesive glass film is a glass film containing no Pb, and the composition of the reinforcing glass is a glass containing no Pb. 4. A winding window is formed in the first core half, at least a part of the winding window is filled with reinforcing glass, and then a gap surface is formed together with the second core half pair. A nonmagnetic film and an adhesive glass film are laminated in this order on the gap surface of one core half body, and a nonmagnetic film and a chromium layer are laminated in this order on the gap surface of the second core half body. A method of manufacturing a magnetic head, wherein the second core half body is bonded by heat treatment through the bonding glass film and the chromium layer.