JPH03250405A - Magnetic head - Google Patents

Abstract

PURPOSE:To simplify an adhering process and to enhance the accuracy and strength of welding and joining of constituting elements to each other by using specific crystallized glass. CONSTITUTION:The self-adhesive type crystallized glass consisting of such compsn. that the components to be not precipitated as crystals form a glass matrix is used for this magnetic head 10 and is integrally joined with the other constituting elements by heating and melting of the above-mentioned matrix. The crystallized glass contg. respectively prescribed ratios of SiO2, K2O, Al2O3, Na2O, PbO, and Li2O, etc., are usable as this glass. The head 10 is produced by using a pair of core half bodies 11, 12 obtd. by forming the films of magnetic metallic cores 14 on wear resistant nonmagnetic substrates 13 and welding protective substrates 15 of the above-mentioned glass to the cores 14.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic head used in a magnetic recording/reproducing device, and particularly to the manufacture of a magnetic head that requires high precision and high reliability.

(Prior Art) In recent years, the development of systems that handle signals in high frequency bands, such as high-definition video tape recorders (VTRs) and digital signal magnetic recording, has become active. Improvements have also been made accordingly. For example, in the past, ferrite materials with low high frequency loss were most commonly used for high-band magnetic heads, but with the development of thin film forming technology, amorphous,
Metal-based magnetic materials with high saturation magnetic flux density, such as Fe-A, Q-Ni alloy, Fe-N system, etc., are used alone as a magnetic core, or as a composite core joined with a ferrite material.

A magnetic head whose magnetic core is made of a single ferrite material is VT.
Since it has been used as an R magnetic head for a long time, its manufacturing method is largely established. The outline is to prepare a pair of core half blocks made of ferrite magnetic material, form winding grooves on a part of the mirror-finished abutting surfaces, and create multiple track regulating grooves from the tape sliding surface. After forming the winding groove, both blocks are sputtered,
Alternatively, after abutting through a non-magnetic material formed on the abutting surfaces by a thin film forming means such as vapor deposition, and joining them together by, for example, melting and filling a part of the winding groove or the track width regulating groove with a glass material, The chip core is obtained by cutting into a predetermined shape.

When used as the composite core, for example, a composite core can be obtained in the same process as described above by using a metal-based magnetic material formed by sputtering or other means near the track width regulating groove. It will be done.

Furthermore, there is a laminated magnetic head as another head structure. In this method, a thin film of metallic magnetic material is formed on a wear-resistant non-magnetic substrate to a thickness equal to the track width, but when the track width becomes wider, eddy currents occur within this thin film at high frequencies. Because of this loss, nonmagnetic films and magnetic films are alternately laminated by a thin film forming method such as sputtering.

In any case, the general method for bonding in the manufacturing process of these heads is to use low melting point glass, which is an inorganic adhesive with high weather resistance and reliability. These glasses can be produced in the form of fibers that are melted in an electric furnace and then poured or pressed, or by applying a powdered glass called frit to the required locations using a method similar to silk printing. Then, there is a method of melting it in an electric furnace and using it as an adhesive, or a method of forming a thin glass film in the necessary places using a thin film forming technique such as sputtering or vapor deposition, and then melting and bonding it in the same way in an electric furnace. Furthermore, some of the glasses used in these materials have a higher melting point by splitting the crystals during heating and melting.

(Problems to be Solved by the Invention) As described above, when glass is melted and used as an adhesive, there are the following problems.

(1) Effects of air bubbles in the glass adhesive that occur during glass bonding.

For example, in a magnetic head that has a structure in which glass adhesive is exposed on the sliding surface of the medium, air bubbles create depressions on the sliding surface, and during use, dirt accumulates in these depressions and air gets caught in the magnetic head. There is a drawback that the contact with the recording medium becomes impossible, and highly reliable recording and reproduction cannot be performed. Furthermore, even if the recesses caused by air bubbles are not directly exposed on the sliding surface, if air bubbles are present, microcracks will develop from the air bubbles during processing during the head manufacturing process, making the magnetic head more likely to break. The problem was that I couldn't do it.

(2) Adhesive glass has poor abrasion resistance.

In a magnetic head with a structure in which adhesive glass is exposed on the sliding surface of the medium, the wear resistance of the adhesive glass is low, so during use, uneven wear creates dents in this area, and these dents make it difficult to maintain good contact with the medium. There were some inconveniences such as not being able to secure a proper hit.

(3) Bonded glass is weak against impact loads.

Glass has invisible scratches (microcracks) that become the starting point for destruction, so it is a material with low mechanical strength, so glass was used as a component in the head other than as an adhesive. In this case, there were problems with manufacturing yield.

(4) Bonded glass has low heat resistance.

■Generally, as the temperature of glass increases, it begins to melt and eventually becomes as viscous as water. Glass molds take advantage of this property, but for example, when bonding glass twice, the second bonding temperature must be lower than the first bonding temperature, otherwise the first bonded glass part will soften. However, there was an inconvenience that the joints could move. Therefore, it is necessary to select a bonding glass with a low working temperature as the number of times of bonding increases, but glass with a low working temperature has poor reliability in terms of adhesion, strength, weather resistance, etc., making glass bonding difficult. .

(2) One way to solve the above problems is to use glass, which precipitates crystals during bonding, as an adhesive. This takes advantage of the fact that the melting point of crystallized glass is much higher than the working temperature during bonding.

However, this is in the form of a powder and crystallizes when heated, so it cannot be shaped into a predetermined shape, for example (fiber-like), making it difficult to use.

Further, when a powder is dissolved with a binder and applied by a method such as screen printing, there are problems such as bubbles are likely to be generated, thickness is uneven, and the yield is poor.

(Means for Solving the Problems) The present invention has been made to solve the above problems, and uses self-adhesive crystallized glass having a composition such that components that do not precipitate as crystals form a glass matrix for a magnetic head. It is an object of the present invention to provide a magnetic head characterized in that the glass matrix is used as a part of a component of the magnetic head and is integrally joined to other components of the magnetic head by heating and melting the glass matrix.

(Example) The self-adhesive crystallized glass used in the present invention is
Components that are not precipitated as crystals form a glass matrix, for example, L i 20 , S t
There are O2-based, Na2O, Ag2O3°SiO2-based, etc.

Since the crystallized component has a much higher melting point than the non-crystallized component, only the non-crystallized component can be melted at a relatively low temperature and welding becomes possible.

However, to give an example of the components of such crystallized glass without deforming the entire glass during welding, in the Li2O,5i02 system, 5i072.4%, K2
O7.2%, All, 033.5%, Na2
03.7%, PbO3.4%, Li 207.8% (
wt%).

An example in which the above-described self-adhesive crystallized glass is used as a component of a magnetic head will be described below as an example. , [Example 1] FIG. 1 shows a laminated magnetic head 10 according to a first embodiment of the present invention.
FIG. 2 is a perspective view of a pair of magnetic core halves 11 and 12 joined together via a non-magnetic material. Core half 11.1
2 consists of a metal magnetic core 14 formed on a wear-resistant non-magnetic substrate 13, and a protective substrate 15 made of self-adhesive crystallized glass welded to the metal magnetic core 12. The metal magnetic core 14 may be formed by alternately laminating non-magnetic films and magnetic films (not shown) in order to improve high frequency characteristics. 16 is a winding groove, and a coil (not shown) is wound using this groove 16.

Reference numeral 1718 denotes molded glass melted and filled in a part of the winding groove 16 and one mold groove, respectively, and the core half body 11
．． 12 are joined together. A magnetic gap 20 is formed between the metal cores 14 and 14.

FIGS. 2A to 2E are perspective views for explaining the manufacturing process of the laminated magnetic head shown in FIG. 1, and the following description will be made using the same figures.

First, as shown in FIG. 2A, a metal magnetic film made of, for example, amorphous, sendust, Fe-N system, etc. is formed on a non-magnetic substrate 13 by a thin film forming method such as sputtering or vapor deposition. A core 14 is provided. Of course, the metal core 14 may be formed by alternately forming nonmagnetic films and metal magnetic films.

Next, as shown in Figure (B), a plurality of nonmagnetic substrates 13 provided with metal magnetic cores 14 and protective substrates 5 made of self-adhesive crystallized glass are prepared, and as shown in Figure (C). After these substrates 13 and 15 are alternately stacked, pressure and heating are performed. As a result, the glass matrix other than the portion precipitated as crystals from the self-adhesive crystallized glass of the protective substrate 15 is melted out, making it possible to firmly bond the laminated substrates 13 and 15 together, thereby obtaining the laminated block 21. I can do it. At this time, the metal magnetic cores 14 on the nonmagnetic substrate 13 are stacked so that they face in the same direction.

Next, as shown in FIG. 2C, the laminated block 21 is cut along the cutting line 22, and a rectangular core half block 23 is obtained through a process such as polishing.

Next, as shown in FIG. 2D, winding grooves 17 and mold grooves 19 are formed in the core half block 23.

Next, as shown in FIG. 1D, the pair of processed core half blocks 23 are butted together with a thin film (magnetic gap material) made of non-magnetic material interposed therebetween, and then a part of the winding groove 17 is A core block 24 is obtained by melting and filling mold glass 17 and 18 into the mold groove 27.

Next, the core block 24 is cut into a predetermined size and shape to obtain the laminated magnetic head 10 shown in FIG.

As mentioned above, according to the method of manufacturing the laminated magnetic head 10 of the present invention, the process is simpler compared to the glass bonding method using ordinary frit, and there is almost no dimensional change due to pressure or heating. A highly accurate magnetic head can be obtained.

Further, since the medium sliding surface is formed from a substrate made of crystallized glass and wear resistance, there is no occurrence of depressions due to air bubbles, and therefore a highly reliable magnetic head free from dust is obtained.

[Embodiment 2] FIG. 3 shows a laminated magnetic head 30 according to a second embodiment of the present invention.
1 is a perspective view showing an embodiment of the present invention, since it has basically the same structure as the laminated magnetic head 10 shown in FIG.
The same components are given the same reference numerals, and only the different points will be explained.

31 and 32 are core halves, which are joined together via a non-magnetic material as described above.

The difference is that the metal magnetism 14 is formed on a composite substrate 35 in which a magnetic member 33 made of a ferrite magnetic material or the like and a non-magnetic member 34 made of self-adhesive crystallized glass are bonded. It is.

The non-magnetic member 34 is joined to the magnetic member 33 so that the magnetic member 33 is not exposed to the medium sliding surface, and forms the medium sliding surface instead.

With the above configuration, the effect between the magnetic head 10 and the path of the first embodiment can be obtained, but the unique effect of this embodiment is that the cross-sectional area of the magnetic path can be increased even if the track width is narrowed. This has the advantage that a highly efficient laminated magnetic head 30 can be obtained.

FIGS. 4(A) to 4(C) show the laminated magnetic head 3 shown in FIG.
2 is a perspective view for explaining the manufacturing process of the multilayer magnetic head 10 shown in FIG.
Only the different points will be explained.

First, as shown in Figure (A), a thin plate-shaped non-magnetic member 34 made of self-adhesive crystallized glass is bonded onto a block-shaped magnetic member 33 by pressure bonding and heating. After cutting into strips to form a plate-shaped composite substrate,
A metal core 14 is formed on the surface of this composite substrate 35 by a thin film forming means, as shown in FIG. 2(A).

Next, as shown in FIG. 4(B), a plurality of composite substrates 35 on which the metal core 14 is formed and a plurality of plate-shaped protective substrates 15 are prepared, and as shown in FIG. 4(C), these substrates are After 15.35 is laminated alternately, a laminated block 36 is obtained by applying pressure and heating.

Next, the laminated block 36 is cut along the cutting line 37,
A rectangular core half block 38 is obtained through a process such as polishing. After that, FIG. 2 (D), (
By going through the step E), a laminated magnetic head 30 shown in FIG. 3 is obtained.

[Third Embodiment] FIG. 5 is a perspective view showing essential parts of a magnetic head 40 according to a third embodiment of the present invention.

In a normal ring-shaped magnetic head, core halves having similar shapes or core halves having different shapes are butted together through a magnetic gap material having a predetermined thickness, and as described above, Glass is welded using a part of the winding window 16 and the mold groove 19.

In this embodiment, a thin film 43 of self-adhesive crystallized glass is used as a part of the gap material made of non-magnetic material, and the core half 43 is
．． 42 are joined together. That is, the core half 41
．． A thin film 43 made of self-adhesive crystallized glass is placed between the wear-resistant non-magnetic films 44 formed in advance on the abutting surfaces of 42.
By interposing the core half body 41. by applying pressure and heating.
42 are joined together, which allows for a strong joint.

Further, since it is not necessary to fill the winding groove 45 with molded glass, it is possible to sufficiently wind the wire even if the length of the winding groove 45 is shortened, and therefore the length of the magnetic path can be shortened. , and a highly efficient magnetic head can be obtained.

FIG. 6 is a perspective view for explaining a composite type floating head 50 of fourth to sixth embodiments to be described below.

As shown in the figure, a composite type floating head 50 normally consists of a head section 51 and a slider section 52. A rail 54 formed by a pair of grooves 53 is provided on the medium sliding surface of the slider portion 52 . In these embodiments, the head portion 51 is welded directly or indirectly to the side surface 54a of the rail 54 using self-adhesive crystallized glass.

[Fourth Embodiment] FIG. 7 is a plan view of a composite type floating magnetic head 55 according to a fourth embodiment of the present invention. In this embodiment, the slider 56 is made of self-adhesive crystallized glass, and the magnetic head 51 is melt-bonded directly to the side surface 54a of the rail.

With the above configuration, the head part 51 can be directly joined to the slider without using an adhesive or the like, so a groove is formed in the slider as in the past, the head part is dropped into this groove, and the head part 51 is joined using a glass mold. This simplifies the manufacturing process, simplifies positioning, and since there is no deformation, highly accurate assembly is possible.

[Fifth Embodiment] FIG. 8 is a plan view of a composite floating head 57 according to a fifth embodiment of the present invention.

In this example, the head portion 51 is bonded to the rail side surface 54a of the slider portion 52 via a spacer 58 made of self-adhesive crystallized glass.

By providing the spacer 58 in advance on the head portion 51 side, assembly can be easily performed.

[Sixth Embodiment] FIG. 9 is a plan view of a composite type floating head 59 according to a sixth embodiment of the present invention.

In this example, a spacer 60 made of self-adhesive crystallized glass is provided in advance on the entire side surface of the slider portion 52, and the head portion 51 is joined to the spacer 60 by welding.

[Seventh Embodiment] FIG. 10 is a perspective view of a composite head 70 according to a seventh embodiment of the present invention, in which two single heads 7172 are joined together and used. single head 71.
72 is one that is welded and bonded together via a bonding plate 73 made of self-adhesive crystallized glass.

[Eighth Embodiment FIG. 11 shows a composite helad 74 of the eighth embodiment of the present invention.
This is a perspective view of a magnetic head 72 and a sensor 75 other than the magnetic head (for example, an optical sensor) which are welded together via a bonding plate 73 made of self-adhesive crystallized glass. In the seventh and eighth embodiments, crushing positioning is possible 5 [Ninth embodiment] FIG. 12 shows a thin film magnetic head 8 of the ninth embodiment according to the present invention.
FIG. Thin film magnetic head 80 is typically manufactured using IC manufacturing technology.

In the figure, 81 is a substrate made of wear-resistant non-magnetic material, on which a first magnetic film 82 is formed, and on top of this a U-shaped second magnetic film 82 is formed via a non-magnetic film (not shown). A magnetic film 83 is formed to form a ring core 84. 85
is a magnetic gap formed between the first and second magnetic films 82 and 83, and is provided so as to be exposed on the medium sliding surface 86.

87 is a coil pattern made of conductive metal formed so as to surround a part of the magnetic path of the ring core 84, and a lead wire 88 is connected to the end thereof.

A protective film 89 is made of glass or the like, and is formed to cover the ring core 84 and the coil pattern 87 . Reference numeral 90 denotes a protective substrate made of self-adhesive bonded glass, which is the essential part of the present invention, and has a flat surface and is coated with a protective film 8.
It is welded and joined on top of 9. With the above configuration, the protective substrate can be welded and bonded onto the molded glass 89 without using an organic adhesive as in the conventional case, so there is no dirt attached to the medium sliding surface 86 due to uneven friction during use, and reliability is improved. A thin-film magnetic head 80 with a high level of performance can be obtained.

Further, as a modification of this, self-adhesive crystallized glass may be used for the substrate 81. With such a configuration, it can be easily joined to, for example, the slider.

(Effects of the Invention) As described above, according to the present invention, self-adhesive crystallized glass having a composition such that components that do not precipitate as crystals form a glass matrix is used as a part of the component of the magnetic head, and By heating and melting the glass matrix,
To provide a magnetic head with high strength and reliability, which simplifies the bonding process by integrally bonding the other components of the magnetic head, and allows the components to be welded and bonded together with high precision. is possible.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a laminated magnetic head according to a first embodiment of the present invention, and FIGS. 2A to 2E are perspective views for explaining the manufacturing process of the laminated magnetic head shown in FIG. 3 is a perspective view showing an embodiment of the laminated magnetic head according to the second embodiment of the present invention, and FIGS. 4(A) to (C) are diagrams for explaining the manufacturing process of the laminated magnetic head shown in FIG. 3. FIG. 5 is a perspective view showing the main parts of a magnetic head according to a third embodiment of the present invention, and FIG. 6 is a perspective view for explaining composite type floating heads according to fourth to sixth embodiments. 7 is a plan view of a composite type floating magnetic head according to a fourth embodiment of the present invention, FIG. 8 is a plan view of a composite type floating head according to a fifth embodiment of the present invention, and FIG. FIG. 10 is a plan view of a composite type floating head according to a sixth embodiment of the present invention, FIG. 10 is a perspective view of a composite head according to a seventh embodiment according to the present invention, and FIG. 11 is a composite head of an eighth embodiment according to the present invention. FIG. 12 is a perspective view of a thin film magnetic head according to a ninth embodiment of the present invention. 10.30, 40, 50, 55, 57, 59°70.7
4.80...Magnetic head, 11.12, 31, 32, 4], 42 Core half, 1
3...Nonmagnetic substrate, 14...Metal magnetic core, 15...
- Protective substrate made of self-adhesive crystallized glass, 1.6.
45...Winding groove, 17.18...Mold glass, 19...Mold full, 20-...Magnetic gap, 33...Magnetic member, 3
4... Non-magnetic member made of self-adhesive crystallized glass, 35... Composite substrate, 43... Thin film made of self-adhesive crystallized glass, 44.
...Nonmagnetic film, 51...Head part, 52...Slider part, 53...Groove, 54...Rail, 56...Slider part made of self-adhesive crystallized glass, 58.60. ...Spacer made of self-adhesive crystallized glass, 71.72...Single magnetic head, 73...Joining plate made of self-adhesive crystallized glass, 75
... Sensor 81 ... Substrate made of non-magnetic material, 82
．． 83...Magnetic film, 84...Ring core, 85...
- Magnetic gap, 86... Medium sliding surface, 87... Ring core, 88... Lead wire, 89... Protective film, 90... Protective substrate made of self-adhesive crystallized glass.

Claims (9)

[Claims] (1) Self-adhesive crystallized glass having a composition in which components that do not precipitate as crystals form a glass matrix is used as a part of the component of the magnetic head, and by heating and melting the glass matrix, the magnetic A magnetic head characterized by being integrally joined with other components of the head. (2) In a magnetic head formed by joining magnetic core halves together through a non-magnetic material, the self-adhesive crystallized glass according to claim 1 is used as a part of the non-magnetic material. Features a magnetic head. (3) A thin film of metal magnetic material is formed on a wear-resistant substrate, and a pair of core halves, which are made by bonding a protective substrate to this metal core, are bonded together via a non-magnetic material. In the magnetic head according to claim 1, the protective substrate is provided with
A magnetic head characterized by using the self-adhesive crystallized glass described in 1. (4) A magnetic head comprising a plurality of magnetic heads joined together via spacers, characterized in that the self-adhesive crystallized glass according to claim 1 is used for the spacers. (5) A magnetic head formed by joining a magnetic head and a sensor other than the magnetic head via a spacer, characterized in that the self-adhesive crystallized glass according to claim 1 is used for the spacer. head. (6) In a composite floating type magnetic head formed by integrally joining a head part and a slider part, which are separate parts,
A magnetic head characterized in that the head portion and the slider portion are joined via a spacer made of the self-adhesive crystallized glass according to claim 1. (7) In a composite floating type magnetic head formed by integrally joining a head part and a slider part, which are separate parts,
A magnetic head characterized in that the slider portion is formed of the self-adhesive crystallized glass according to claim 1. (8) A thin-film magnetic head constructed by forming and processing a magnetic material, an insulating material, a conductive material, etc. on a substrate using IC manufacturing technology, which is formed on the substrate. A magnetic head characterized in that the self-adhesive crystallized glass according to claim 1 is used as a part of the protective member of the magnetic core. (9) The magnetic head according to claim 8, characterized in that the substrate is made of crystallized glass.