JPH07249211A - Housing for composite type magnetic head - Google Patents

Abstract

PURPOSE:To avert failure of a core chip by forming a slit to be inserted and fixed with the core chip in either of supporting parts existing in parts to be formed as right and left two air flowing surfaces. CONSTITUTION:The parts where the right and left air floating surfaces 24 re formed are supported by the columnar supporting parts 16 and are subjected, in this state, to grinding and polishing for the purpose of forming the air floating surfaces 24 and, therefore, a ski-jump effect does not arise at all, unlike heretofore in the production process of this composite type magnetic head. Since the core chip 22 is wound with a coil 26 in the state of holding the core chip with the right and left supporting parts 16a, 16b, the leg parts 30 of the core chip 22 are effectively protected. Consequently, problems, such as failure of the core chip, at the time of coil winding do not arise.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite magnetic head housing, and more particularly to a composite magnetic head used in a fixed magnetic disk drive, and more particularly to a housing used to manufacture a core slider thereof. is there.

[0002]

2. Description of the Related Art Among core sliders for floating magnetic heads used in fixed magnetic disk devices, there is a so-called composite type core slider. In this method, a slider body having an air bearing surface (air bearing portion) and a core chip for forming a recording / reproducing unit for writing or reading predetermined information on or from a magnetic disk which is a magnetic recording medium are separately manufactured, And, the slider body and the core chip, which are separately manufactured, are integrally assembled to each other, and have a structure that is different from the monolithic type.
It has a feature that the thickness of the core for recording / reproducing, and eventually the inductance can be reduced to improve the high frequency characteristics.

In manufacturing such a composite type core slider for a magnetic head, a housing for providing the slider body described above is conventionally known, for example, as shown in FIG. There is.
The housing 50 shown in FIG. 6 is composed of a rectangular parallelepiped structure made of nonmagnetic ceramics such as CaTiO ₃ , and has an inclined groove 5 for coil winding at the end thereof.
2 and a groove (slit) 54 for inserting a core chip at the end of the portion that becomes the air bearing surface.

Then, as shown in FIG. 7, a well-known core chip 56 having a rectangular frame-like ring shape is inserted and positioned in the core chip insertion groove 54 of the housing 50, and integrated by glass bonding. As shown in FIG. 8, the left and right air floating surfaces 58, 58 are formed by cutting, further polished and finished, and then the coil 62 is wound around one leg portion 60 of the core chip 56. The desired composite magnetic head 64 is configured.

Incidentally, with the increase in capacity and size of fixed magnetic disk devices, there is a demand for size reduction and higher performance of magnetic heads and also of core sliders used therein, and in particular, reduction of inductance is required. Therefore, in addition to downsizing of the core, it is necessary to reduce the cross-sectional area of each part of the core, particularly the part around which the coil is wound, that is, to make the core thinner (thinner).

However, when the core slider is manufactured using the housing 50 having the conventional structure as described above to manufacture the target magnetic head, the thin core chip 56 is inserted into the core chip insertion hole 54, and the glass is inserted. After the air bearing surface 58 is fixed by bonding, the air bearing surface 58 is formed by cutting, and when this is polished and finished, as shown in FIG. 9A, the load applied to the air bearing surface 58 during polishing is applied to the core chip. Since 56 is deformed (bent) without being supported, as shown in FIG. 9B, the end of the air bearing surface 58 jumps up and a so-called ski jump portion appears after the polishing, as shown in (b) of FIG. In addition to the deterioration of the levitation characteristics, the magnetic head may collide with the magnetic disk (crash), which may lead to unreliable problems. When winding the coil 62 to tip 56, were those also inherent problems on product yield of such leg portion 60 of the thin core chip 56 is damaged. Further, when the thin (thin) leg portion 60 of the core chip 56 is not fixed in the core chip insertion groove 54, noise, which is considered to be due to vibration of the leg portion 60 during operation as a magnetic head, so-called RAW. (Ring After Writ
e) There were also problems such as noise.

[0007]

Here, the present invention has been made in view of the above circumstances, and the subject is to:
An object of the present invention is to provide a housing for a composite type magnetic head having a new structure that solves the above problems.

[0008]

In order to solve the above problems, the present invention comprises a structure made of non-magnetic ceramics, and a through hole serving as a coil winding hole is formed in a magnetic recording medium slide of the structure. The one end side in the moving direction is parallel to the surface on the sliding side of the magnetic recording medium and orthogonal to the sliding direction, and extends in the sliding direction on the surface on the sliding side of the magnetic recording medium. A support portion forming groove reaching the through hole from the end surface on the one end side in the sliding direction of the magnetic recording medium is provided between the portions where two air floating surfaces on the left and right, which are parallel to each other, are formed. A core chip extending from the end face of the structure is formed on one of the support portions formed on the left and right sides of the end portion of the structure in the formation groove and located at the two left and right air-bearing surfaces. Has a slit for inserting and fixing A housing for composite magnetic head according to claim Rukoto is for its gist.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to clarify the present invention more specifically, representative embodiments of the present invention will be described in detail with reference to the drawings.

First, FIG. 1 shows an example of a composite magnetic head housing according to the present invention, and FIG.
An example of a process for manufacturing such a housing is shown. In order to obtain the composite magnetic head housing 10 according to the present invention in these figures, first, as shown in FIG. 2, two flat plates 2 and 4 of a predetermined size made of non-magnetic ceramics such as CaTiO ₃ are prepared. To be done.
A groove 4a having a predetermined depth is formed on the end surface of the one flat plate 4. Then, by sputtering or by a method such as coating or baking glass paste on one or both of the flat plates 2 and 4
A glass film for bonding is formed, and thereafter, the two flat plates 2 and 4 are butted to each other through the glass film, heated, and the glass is softened to bond the glass with such a glass. Thus, the joined body 8 which is a structure for providing the housing is obtained. By joining the two flat plates 2 and 4, the groove 4a formed on the end face of the one flat plate 4 is covered by the other flat plate 2, so that one end side of the joined body 8 is closed. In, the through hole 6 extending in the width direction is formed.

Then, the joined body 8 is subjected to machining such as cutting as shown by a broken line in FIG. 2 so that the support portion forming groove 12 and the core chip insertion slit 14 are formed. Formed respectively. In the groove 12 for forming the support portion, an intermediate portion in the width direction of the bonded body is cut off at a depth reaching the through hole 6 from the end surface of the end of the bonded body 8 on the side where the through hole 6 is provided. Further, the core chip insertion slit 14 is provided in a predetermined width with a length sufficient to accommodate the core chip, which extends across the through hole 6 to the other end side of the bonded body 8.

As shown in FIG. 1, the composite type magnetic head housing 10 thus obtained is composed of a bonded body 8 which is a rectangular plate-shaped or block-shaped structure made of non-magnetic ceramics. The through hole 6 serving as a coil winding hole is located at one end side in the recording medium sliding direction so as to be parallel to the surface on the magnetic recording medium sliding side and orthogonal to the sliding direction. Will have.
Further, the support portion forming groove (notch) 12 reaching the through hole 6 from the end surface of the joined body 8 on the one end side in the magnetic recording medium sliding direction becomes the magnetic recording medium sliding side of the joined body 8. It is provided between the portions where two air floating surfaces on the left and right, which are parallel to each other and extend in the sliding direction, are formed. Due to the presence of the groove 12, the left and right of the end portion of the joined body 8 are provided. The support portions 16, 16 located at the two air bearing surfaces are formed so as to project from the end portions. A slit 14 for inserting and fixing a core chip, which extends from the end surface of the bonded body 8 across the through hole 6 and extends in the sliding direction of the magnetic recording medium, is provided on either one of the left and right support portions 16, 16. It is provided at a predetermined depth (length). In addition, by forming the slits 14 as described above, one support portion 16 is divided into two support portions 16a and 16b.

Then, the composite magnetic head 20 as shown in FIG. 3 is manufactured by using such a housing 10. That is, the slit 1 of the housing 10
A core chip 22 having a known structure similar to the core chip 56 shown in FIG. 7 is inserted and positioned in the housing 4, and the core chip 22 is fixed to the housing 10 by a known glass bonding method.
On the surface of the magnetic recording medium on the sliding side of 0, two air-bearing surfaces 24, 2 on the left and right which are parallel to each other and extend in the sliding direction.
4 is formed by grinding and polishing to have a predetermined width as in the conventional case, and then the coil 26 is formed on the leg portion 30 of the core chip 22.
The desired composite magnetic head 20 is completed by winding. The left and right air bearing surfaces 2
Slope portions (leading ramps) 28, 28 having a gentle slope are formed at the leading end portions of 4, 24 by the same leading ramp processing as in the conventional case.

Therefore, the composite magnetic head 20 as described above is used.
In the manufacturing process of, the grinding and polishing process for forming the air-bearing surface 24 is carried out in a form in which the left and right air-bearing surfaces 24 are supported by the columnar supporting portions 16. Therefore, the conventional ski jump phenomenon in which the end portion of the air bearing surface 24 jumps up due to deformation under the load applied during such processing is not caused at all, and thus the magnetic head Deterioration of the flying characteristics and occurrence of collision with a magnetic disk (magnetic recording medium) can be effectively avoided, and the reliability thereof can be remarkably enhanced.

Further, since the core chip insertion slit 14 is provided in the supporting portion 16, the core chip 22 which is inserted, positioned and fixed in the slit 14 is fixed to the supporting portions 16a, Since the core chip 22 is held in a state of being sandwiched by 16b, the core chip 22 can be effectively thinned (thinned), and the inductance can be effectively reduced. Noise reduction can also be achieved advantageously, and since the coil 26 is wound when the core chip 22 is sandwiched between the left and right support portions 16a and 16b, the leg portion 30 of the core chip 22 is effective. Therefore, the problems such as breakage of the core chip at the time of coil winding can be prevented.

Although the AA cross section of the composite magnetic head 20 of FIG. 3 is shown as (a) in FIG. 5, the core chip 22 has a rectangular annular structure as a whole as described above. And, as is well known, a magnetic gap 32 for recording / reproducing on the upper side thereof.
Further, a track portion is formed on a portion sandwiching the magnetic gap 32 to form a track portion 34 having a predetermined height, while the magnetic gap 32 is formed on the protective glass 36 in the same manner as in the conventional case. It is a structure that is protected.
Then, with respect to the leg portion 30 of the core chip 22 having such a structure, the support portions 16a, 16 sandwiching the leg portion 30 from both sides are provided.
Along with b, the coil 26 is wound as shown in FIG.

Further, in the magnetic head 20 having the structure shown in FIG. 3, the core chip 22 has the housing 10
A support portion 16 (specifically 16a,
16b), and the leg portions 30 have sufficient strength, so that the support portions 16, 16 are fixed in the state where the core chip 22 is fixed as shown in FIGS. 4 and 5B. By forming the groove 42 with respect to 16,
The cross-sectional area of the coil winding portion in the leg portion 30 of the core chip 22 can be further reduced, and as a result,
It is possible to further reduce the inductance.

The composite type magnetic head housing according to the present invention has been described above in detail based on a typical example thereof, but the present invention is construed as being limited to only such specific examples. However, it is understood that the present invention can be carried out in a form in which various changes, modifications, improvements, etc. are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention. Should be.

[0019]

As is apparent from the above description, in the composite magnetic head housing according to the present invention, the core chip insertion slit is formed on the surface of the housing on which the magnetic recording medium slides and on the opposite side. Since the core chip is fixed to the support part having a large strength by being provided for the support part that connects the surface and the core chip is inserted and fixed into such a slit, the coil winding is fixed. At the time of the line, it was possible to effectively prevent the core chip from being damaged, and to obtain the desired air bearing surface,
Even when the polishing finishing process is performed, it is possible to effectively avoid the phenomenon that the air bearing surface jumps up, in other words, the ski jump phenomenon occurs.

In addition, since the core chip is reinforced by the presence of the supporting portion integrally provided in the housing, the core chip can be made thinner and its inductance can be effectively reduced. RAW
Noise can also be advantageously reduced, especially by forming a groove in the support,
It is also possible to further reduce the inductance by making the leg portion of the core chip fixed to such a supporting portion thin and further reducing the cross-sectional area of the coil winding portion of the leg portion. Of.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a composite magnetic head housing according to the present invention.

FIG. 2 is an explanatory diagram showing an example of a manufacturing process of the housing shown in FIG.

3 is a perspective explanatory view showing an example of a composite magnetic head obtained by using the housing shown in FIG. 1. FIG.

FIG. 4 is a perspective explanatory view showing another example of the composite magnetic head having a structure different from that of FIG.

5A and 5B are cross-sectional explanatory views of a core chip fixing portion, FIG. 5A is a cross-sectional view taken along line AA in the composite magnetic head shown in FIG. 3, and FIG. It is a BB sectional explanatory view in a head.

FIG. 6 is an explanatory perspective view showing an example of a conventional housing for a composite type magnetic head.

FIG. 7 is an explanatory view showing an example of a conventional core chip, in which (a) is a perspective view thereof and (b) is a side view thereof.

8 is a perspective explanatory view showing a magnetic head manufactured using the conventional composite type magnetic head housing shown in FIG. 6. FIG.

FIG. 9 is an explanatory view showing a state at the time of polishing the air bearing surface of the conventional composite type magnetic head housing, FIG.
FIG. 6B is a side view showing a state in which the core chip is deformed by a load applied during polishing of the air bearing surface, and FIG. 7B is a side view showing a state of the air bearing surface rising after polishing the air bearing surface.

[Explanation of symbols]

2, 4 plane plate 4a groove 6 through hole 8 bonded body 10 magnetic head housing 12 support portion forming groove 14 core chip insertion slit 16 support portion 20 composite magnetic head 22 core chip 24 air floating surface 26 coil 28 slope portion 30 leg Part 32 Magnetic Gap 34 Track Part 36 Protective Glass 42 Groove 50 Housing 52 Inclined Groove 54 Core Chip Insertion Groove 56 Core Chip 58 Air Floating Surface 60 Leg 62 Coil 64 Composite Magnetic Head

Claims (1)

[Claims] 1. A magnetic recording medium sliding member which is formed of a non-magnetic ceramic structure and has a penetrating hole serving as a coil winding hole at one end side in the magnetic recording medium sliding direction of the structural member. Side surfaces that are parallel to each other and are orthogonal to the sliding direction, and two air floating surfaces on the left and right sides that are parallel to each other and that extend in the sliding direction are formed on the surface that is the sliding side of the magnetic recording medium. A groove for supporting portion reaching from the end surface on one end side in the sliding direction of the magnetic recording medium to the through hole, and the groove for forming a supporting portion is provided between the left and right sides of the end portion of the structure. A slit for inserting and fixing a core chip, which extends from an end face of the structure, is provided on either one of the support portions formed on the left and right air floating surfaces. For complex magnetic head Ng.