JPH0562142A - Manufacture of composite floating magnetic head - Google Patents

Abstract

PURPOSE:To reduce the breakage of a core caused by a decline in strength of the core and, at the same time, to improve the finishing accuracy of a slider by finish grinding the surface side of the slider and removing the rear side of the joined section of the slider with the core by grinding after the slider and core are joined to each other to constitute a head. CONSTITUTION:At the time of grinding a slider 1, the slider 1 is ground to a dimension larger than its final dimension by taking it into account that its front and rear surfaces 4 and 5 are ground in the succeeding process. In addition, while a core 2 is manufactured by sticking the base materials of an I-and C-shaped ferrites 21 and 22 to each other to a prescribed thickness with joining glass 23 in between, the width of both joined surfaces in the height direction is set at <=0.125mm so as to prevent the damage of the core 2 and, on the bottom of the core 2, the dimension of the core 2 is also made larger than its final dimension by protruding the ferrite 22 from the ferrite 21 by taking it into account that the core 2 is also ground at the time of grinding the slider 1. Thereafter, the surface of floating rails 8 and 8' on the surface side are finish-ground by using the rear surface of the slider 1 as a reference plain and, at the same time, the depth of a front gap section on the FC side is made to a prescribed value by using the lower surface of the ferrite 22 as a reference.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a magnetic disk or the like for recording / reproducing information connected to a computer or the like, and particularly for recording / reproducing information by floating on a rotating magnetic disk medium. The present invention relates to a method of manufacturing a composite floating magnetic head.

[0002]

2. Description of the Related Art Conventionally, in a composite type flying magnetic head, high-speed access and high-speed information processing have been advanced, and miniaturization of the magnetic head is required.

As shown in FIG. 8, a conventional composite floating magnetic head has a slider 101 made of non-magnetic ceramic.
A ring-shaped magnetic core 102 is bonded to the glass with glass 103, and the ring-shaped core 102 is provided with a winding for electromagnetic conversion.

As a manufacturing method thereof, first, the slider 1
The levitation rail 108 is formed on the surface of 01 (the surface facing the magnetic recording medium), the winding groove 107 is formed so as to communicate with the air outflow side end surface and the side surface of the slider 101, and further from the air outflow side end surface side to the inside. A slider 101 having a core slit 109 formed therein is prepared.

Next, a ring-shaped core 102 is formed by joining a pair of ferrites with a gap material such as glass.
Specifically, as shown in FIG. 2, the ring-shaped magnetic core 102 is formed by joining, for example, an I-shaped ferrite bar 21 and a C-shaped ferrite bar 22 with glass 23 or the like. The center portion of the ring surrounded by the bars 21 and 22 becomes a winding window 24. At this time, the joint portion of both ferrites 21 and 22 in the upper portion of the drawing becomes the front gap portion FG, and the joint portion of the lower portion of the drawing becomes the back gap portion BG. Finally, it becomes important to control the depth dimension of the front gap portion FG. Therefore, when the C-type ferrite 21 and the I-type ferrite 22 are in contact with each other, the C-type ferrite 21 is bonded so as to protrude from the I-type ferrite 22 below the core.

Next, the core 102 is temporarily fixed to the core slit 109 of the slider 101, and the slider 101 and the core 102 are integrally bonded to each other using the bonding glass 103 on the front surface side. If necessary, epoxy resin or the like is filled in the gap between the core slit 109 and the core 102 of the slider 101 on the back surface side.

Next, when the epoxy resin is filled,
Excessive resin protruding from the back surface of the slider 101 is removed and polished.

Next, with the back surface of the slider 101 as the reference surface, the slider 101 is placed and fixed on the reference surface of the lapping jig, and the front surface side of the slider 101 is finish-polished. In this final polishing, the depth of the ring-shaped core 102 on the front gap portion FG side is controlled to be a predetermined depth. Specifically, by setting the lower portion of the C-type ferrite 22 on the lower portion of the core 102 as the reference surface, the surface side can be strictly polished and the gap depth can be strictly controlled at the same time.

Finally, the winding groove 107 of the slider 101
A winding (not shown) is applied to a part of the core 102 exposed from the above, and a composite type flying magnetic head is completed.

[0010]

In the conventional method for manufacturing the composite type flying magnetic head described above, the slider 101 and the core 102 are bonded to each other in a miniaturized state in order to cope with the miniaturization currently required. A predetermined joining depth and surface processing are performed.

In the core 102, in the case of joining a pair of ferrites, the joining area on the front surface side and the joining surface on the back surface side are reduced in order to secure the space of the winding window 24 in which the winding is provided and to reduce the size. I will end up. Therefore, in manufacturing the core 102, a breakage failure occurs.

The inventor of the present invention has considered the relationship of breakage of the core 102 due to the bonding area on the front surface side and the bonding surface on the back surface side. As a result, when the thickness of the core 102 is 0.127 mm and the width in the height direction of the joint is not less than about 0.125 mm, damage may occur easily when the pair of ferrites are joined and processed into the core 102. I found out.

[0013]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides a method of manufacturing a composite floating magnetic head in which a small magnetic head can be formed with high dimensional accuracy and good yield. ..

Specifically, in the method of manufacturing a composite type flying magnetic head, a ring-shaped core made of a pair of ferrites is joined to a slider having a flying rail extending in the longitudinal direction on the surface facing the magnetic recording medium. A step of joining a pair of ferrites to form a ring-shaped core;
A step of forming a core slit into which the core is inserted in the slider, a step of attaching the core to the slider and fixing the core with a joining member, and a surface of the slider is ground with the back surface of the slider as a reference surface. And a step of polishing and removing the back surface side of the core joining portion of the slider.

[0015]

According to the present invention, since the slider having a size larger than the completed size and the core whose pair of ferrite joint surfaces can withstand damage are joined to each other, the slider surface and then the slider back surface are processed in this order. It is possible to manufacture a miniaturized composite type flying magnetic head with a good yield, since there is no damage failure due to the decrease, the finishing processing on the surface side of the slider is favorable.

Moreover, since the slider surface is processed first, the depth of the front gap can be controlled and processed with reference to the bottom surface of the C-type ferrite as in the conventional case. High accuracy can be maintained.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of manufacturing a composite type flying magnetic head according to the present invention will be described in detail below. FIG. 1 is an external perspective view of a composite type flying magnetic head according to the present invention. The composite flying magnetic head is
It is composed of a slider 1 made of non-magnetic ceramic, a ring-shaped magnetic core 2, and a winding (not shown).

The slider 1 has a substantially rectangular parallelepiped shape, and for example, two levitation rails 8 and 8'are formed on the surface 4 side facing the magnetic recording medium.

A winding groove 7 used when winding a winding is formed from the end surface on the air outflow side of the slider 1 to one side surface, and further intersects with the winding groove 7. A core slot 9 is formed from the air outflow side of one of the floating rails 8 ′ toward the inside of the slider 1.

As shown in FIG. 2, the ring-shaped magnetic core 2 is formed by joining, for example, an I-type ferrite 21 and a C-type ferrite bar 22 with glass 23 or the like. The enclosed central portion of the ring becomes the winding window 24.

The core 2 is a slot 1 of the slider 1.
2 is attached to the slider 1 and is further integrally bonded to the slider 1 by the bonding glass 3.

A winding is wound around a part of the core 2 exposed from the winding groove 7 around the joined body of the slider 1 and the core 2 configured as described above, and the composite type flying magnetic head is completed.

Next, the manufacturing method of the present invention will be described. First, the slider 1 having the above structure is molded from a non-magnetic ceramic member by grinding or the like. At this time, in consideration of polishing the front surface 4 and the back surface 5 of the slider 1 in a later step, the size is made larger than the final size.

Next, the core 2 is molded. Specifically, the ferrite base material that becomes the I-type ferrite 21 and the ferrite base material that becomes the C-type ferrite 22 are bonded to each other via the bonding glass 23 and sliced to a predetermined thickness to form the core 2. At this time, the joining portion has a front gap FG and a back gap BG on the side corresponding to the surface 4 of the slider 1.
However, in order to prevent breakage of the core 2 during the above-mentioned slicing, it is important that the width of both joint surfaces in the height direction is at least 0.125 mm or more. Further, as shown in FIG. 2, the C-type ferrite 22 is bonded to the lower portion of the core 102 so as to protrude from the I-type ferrite 21. The height of the core 2 is also set to be larger than the final size in consideration of the fact that the core 2 is simultaneously polished by polishing the front surface 4 and the back surface 5 of the slider 1.

Next, the core 2 and the slider 1 are joined.
Using the back surface 5 of the slider as a reference, the core 2 is temporarily fixed to the core slot 12 formed in the slider 1, the glass rod serving as the bonding glass 3 is placed on the front surface 4, and the glass rod is baked and melted. It is poured into the bonding glass 3 in the gap between the core slot 12 and the core 2. Further, if necessary, epoxy resin, glass or the like 6 is applied or welded and fixed in the gap between the core slot 12 and the core 2 on the slider back surface 5, and the extra epoxy resin, glass or the like 6 protruding on the back surface is removed. ..

Next, the back surface 5 of the slider 1 is used as a reference surface and temporarily fixed to the reference surface of the lapping jig, and the front surface side of the slider 1, particularly the surfaces of the levitation rails 8 and 8'are tapered flat type or crown type. Etc. are finished. At the same time, as in the conventional case, the bottom surface of the C-type ferrite bar 22 is used as a reference, and finish processing is performed until the depth on the front cap portion FG side reaches a predetermined value.

Next, the slider back surface 5 is polished to downsize the slider 1 and the core.

At this time, with reference to the surface between the floating rails 8 and 8 ', the entire slider back surface 5 is polished by at least 10 μm or more as shown in FIG. To reduce the size of only the core 2, it is sufficient to remove at least the protrusion of the core 2 in the vicinity of the slot 9 inserted into the slider 1. At this time, as shown in FIGS. The removal parts 31 to 34 may be provided in a part including the core 2 part.

Finally, a part of the core 2 exposed from the winding groove 7 of the slider 1 is wound to complete a composite type flying magnetic head.

In the above steps, the core 2 having a sufficiently large bonding surface is prepared in advance, and after bonding to the slider 1, the small core 2 having a predetermined shape is ground when the back surface 5 of the slider 1 is ground. The slider 1 and the core 2 can be easily downsized without damaging the core 2.

The inventor has found that the final core 2 has a total height of 0.6.
mm, length 1 mm, width 0.1 mm, final slider 1 dimensions were 0.6 mm in total height, 3 mm in total length, and 2 mm in width. In the product of the present invention, the size of the core 2 was previously set to 0.72 mm in total height, and the width in the height direction of both joint portions was set to 0.2 mm. At this time, there is 1% failure of the core 2
It was below. On the other hand, in the conventional manufacturing method, when the total height is set to 0.65 mm in advance and the width of the joint surface on the back gap side in the height direction is 0.12 mm,
As for breakage failure, 10% occurred.

Since the depth of the gap FG on the surface 4 side of the slider 1 can be controlled with reference to the bottom surface of the C ferrite bar 22, its dimensional accuracy can be stably maintained.

Further, the core magnetic flux efficiency is proportional to the parameter expressed by the following equation.

Magnetic resistance of gap portion / (magnetic resistance of gap portion + material + back surface gap portion) There is an improvement of 0.1% in the magnetic flux efficiency, and in the case of this embodiment, a stable and high electromagnetic conversion characteristic is obtained. Confirmed to show.

As the core 2 of the present invention, the gap portion F
A metal-in-gap or the like in which a high magnetic flux density metal thin film is formed in order to cope with a high density of G may be used, and the structural shape of the pair of ferrites can be arbitrarily changed.

[0036]

As described above, according to the present invention, the core can be formed in the strongly joined state as described above, and further the surface side can be finish-polished while the rigidity of the slider is maintained. Since it can be processed into a compact size, it can reduce breakage defects due to strength reduction of the core, can maintain the dimension that is the standard of the gap depth from the air bearing surface with high accuracy, and has a good yield and a compact composite flying magnetic head. Is possible.

Furthermore, the C type and I of the core on the back side of the slider
It is possible to obtain a large magnetic head bonding area and to obtain a magnetic head having high magnetic flux efficiency.

[Brief description of drawings]

FIG. 1 is an external perspective view of a composite floating magnetic head according to the present invention.

FIG. 2 is a side view of a core used in the present invention.

FIG. 3 is an external perspective view of the back surface side of the composite floating magnetic head of FIG.

FIG. 4 is an external perspective view of the back surface side of another composite type flying magnetic head according to the present invention.

FIG. 5 is an external perspective view of the back surface side of another composite type flying magnetic head according to the present invention.

FIG. 6 is an external perspective view of the back surface side of another composite type flying magnetic head according to the present invention.

FIG. 7 is an external perspective view of the back surface side of another composite type flying magnetic head according to the present invention.

FIG. 8 is an external perspective view of a composite type flying magnetic head according to a conventional manufacturing method.

[Explanation of symbols]

 1 ... ・ Slider 2 ・ ・ ・ ・ Core 3 ・ ・ ・ ・ Glass 4 ・ ・ ・ ・ Front surface 5 ・ ・ ・ ・ Back surface 7 ・ ・ ・ ・ Winding groove 8, 8 '・ Floating rail

Claims (1)

[Claims] 1. A method of manufacturing a composite floating magnetic head, comprising a pair of ring-shaped cores made of ferrite bonded to a slider having a flying rail extending in a longitudinal direction on a surface facing a magnetic recording medium. To form a ring-shaped core, forming a core slit into which the core is inserted in the slider, attaching the core to the slider, and fixing the core with a joining member; A method of manufacturing a composite floating magnetic head, comprising: a step of polishing the front surface of a slider with the back surface of the slider as a reference surface; and a step of polishing and removing the back surface side of a core joint portion of the slider.