JP2000153451A - Crown forming method and crown forming device for flotation type magnetic head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a crown protruded only in a length direction of a slider at high productivity and with less irregularity is crown form. SOLUTION: Using a jig 3 having a protruded and curved surface 6 and a lapping machine 2 having a recessed and curved machining surface 4, a bar roughly in the form of a rectangular parallelopiped comprising more than one magnetic head elements serially formed in a line on a side wall surface 23 is placed on the protruded and curved surface 6 to put a surface to be machined on the side of the lapping machine 2, the bar is deformed like an arc in a length direction to be affixed to the protruded and curved surface 6, an upper surface (the surface to be operated) of the bar is brought into contact with the machining surface 4, and the upper surface (the surface to be processed) and the machining surface 4 are relatively moved, so the upper surface (the surface to be processed) is lapped. A crown is thus formed in a flotation surface of a flotation type magnetic head.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a crown on a flying surface of a flying magnetic head, and to a crown forming apparatus for a flying magnetic head.

[0002]

2. Description of the Related Art A floating magnetic head performs recording and reproduction of information on and from a magnetic recording medium while floating from the magnetic recording medium. The floating magnetic head operates based on a so-called CSS system in which the magnetic recording medium floats from the magnetic recording medium by moving, and is mounted on the magnetic recording medium again when the magnetic recording medium stops. The floating magnetic head and the magnetic recording medium are easily attracted to each other due to the high smoothness of the surfaces facing each other, and there is a possibility that the floating magnetic head and the magnetic recording medium may have problems. Therefore, the floating surface of the floating magnetic head is made to have a convex curved surface, and the contact area between the floating surface and the magnetic recording medium is reduced to prevent mutual adsorption. The convex curved surface formed on the air bearing surface is called a crown. Various methods have conventionally been employed for forming the crown.

A conventional method for forming a crown of a floating magnetic head will be described with reference to the drawings. FIG. 10 shows a first example of a conventional crown forming method for a floating magnetic head. In FIG. 10, a substantially rectangular parallelepiped bar 61 in which floating magnetic head elements are arranged in a row and a groove jig 62 are prepared. The bar 61 has a plurality of magnetic head elements on one surface (left side surface) 61a. The bar 61 is obtained by cutting a wafer on which a large number of magnetic head elements are formed into a substantially rectangular parallelepiped shape and polishing the other surface (bottom surface) 61c to adjust the gap between the coil of the magnetic head element and the gap. The groove jig 62 has a groove 62a formed on one surface (upper surface).

Next, a molten wax 63 is applied to the groove 62a, and the bar 61 is placed on the other surface 61c with the other surface 61c facing down.
And the wax 63 is placed on the groove jig 62 so as to be in contact with the wax 63. Next, the wax 63 is contracted by cooling and solidifying the wax 63, and the bar 61 is deformed into an arc shape. The bar 61 is fixed to the groove jig 62 by the wax 63. At this time, the other surface 61c of the curved bar is a convex curved surface. Next, the curved surface 61b facing the other surface 61c of the bar 61 is polished to a flat surface 61d. Next, the bar 61 is removed from the groove jig 62 and cut at equal intervals in the longitudinal direction of the bar to obtain a floating magnetic head. The flying magnetic head has a crown formed as a convex curved surface by deformation of the bar 61.

FIG. 11 shows a second example of a conventional method for forming a crown of a floating magnetic head. In FIG. 11, first, a substantially rectangular parallelepiped magnetic head slider 71 is prepared. The magnetic head slider 71 is provided with a magnetic head element (not shown) in advance. Also, the magnetic head slider 7
On one floating surface 72, a pair of rails 72a, 72a is formed. Next, a laser beam 74 is irradiated between the rails 72a, 72a of the magnetic head slider 71 to form a plurality of cracks 73 along the lateral direction of the magnetic head slider 71. Next, the magnetic head slider 71 is deformed in an arc shape along the longitudinal direction, and the flying surface 72 is formed into a convex curved surface. Since the cracks 73 are formed on the flying surface 72, the magnetic head slider 71 is easily deformed.
Thus, the flying surface 72 of the magnetic head slider 71
A crown is formed.

FIG. 12 shows a third example of a conventional method for forming a crown of a floating magnetic head. 12, first, a substantially rectangular parallelepiped magnetic head slider 81 is prepared. Also, a lap surface plate 85 having a processing surface 85a having a concave curved surface is prepared. The magnetic head slider 81 is provided with a magnetic head element (not shown) in advance. Also, a pair of rails 82a are provided on the floating surface 82 of the magnetic head slider 81.
82a are formed.

Next, the magnetic head slider 81 is fixed on the flat surface 84a of the jig 84 via the elastic sheet 83 with the flying surface 82 facing upward. Next, the magnetic head slider 8
The jig 84 to which 1 is fixed is placed on the surface plate 85 so that the flying surface 82 of the magnetic head slider 81 and the processing surface 85a of the lap surface plate 85 are in contact with each other. Next, the processing surface 85a
The abrasive is sprayed on the jig 8 and the jig 8
The floating surface 82 is pressed against the processing surface 85a by applying a load of 4. Further, the jig 84 is rotated while the lapping plate 85 is rotated, and the floating surface 82 of the magnetic head slider 81 and the processing surface 85a are slid with each other to perform the lapping process. At this time, the flying surface 82 is transferred to the shape of the processing surface 85a and becomes a convex curved surface, and its curvature becomes equal to the curvature of the processing surface 85a. On the magnetic head slider 81 thus obtained, a crown 87 having a convex curved surface is formed along the longitudinal direction and the lateral direction.

[0008]

However, in the first example of the conventional method of forming a crown of a floating magnetic head,
Since the formation of the crown is caused by the shrinkage of the wax 63 and the groove 62a of the groove jig 62, there is a problem that the shape of the crown tends to vary.

In the second example of the conventional method of forming a crown of a floating magnetic head, it is necessary to irradiate a laser beam 74 a plurality of times to form a crack 73, so that the process becomes complicated and the productivity is low. There was a problem that.

Further, in the third other example of the conventional method for forming a crown of a floating magnetic head, the productivity is low because the magnetic head sliders 81 are handled one by one. The magnetic head slider 81 has a convex curved surface (cross crown) that is convex in the longitudinal direction and the lateral direction, and there is a problem that a crown that is convex only in the longitudinal direction of the magnetic head slider 81 cannot be formed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is capable of forming a crown having high productivity, small variations in crown shape, and convex only in the longitudinal direction of the slider. It is an object of the present invention to provide a simple crown forming method. Another object of the present invention is to provide a crown forming apparatus which has high productivity, has small variations in crown shape, and can form a crown which is convex only in the longitudinal direction of the slider.

[0012]

In order to achieve the above object, the present invention employs the following constitution. In the method of forming a crown of a floating magnetic head according to the present invention, a surface to be processed adjacent to the side wall surface of a substantially rectangular parallelepiped bar having one or more magnetic head elements formed in a row on the side wall surface is lapped. By cutting the bar along the transverse direction, the surface to be processed becomes a floating surface, and when manufacturing a floating magnetic head including at least one magnetic head element, a convex curved surface is formed. Using a jig having a lap surface having a concave curved processing surface, the work surface of the bar is set on the lap surface side, and the bar is placed on the convex curved surface of the jig, The bar is deformed in an arc shape along the longitudinal direction and attached to the convex curved surface, the processed surface of the bar is brought into contact with the processed surface of the lap platen, and the processed surface and the processed surface are relatively moved. To lap the work surface Ri, characterized in that to form a crown on the floating surface of the floating magnetic head. Preferably, the convex curved surface is a convex spherical surface, and the concave curved surface is a concave spherical surface.

In the method for forming a crown of a floating magnetic head, it is preferable that a radius of curvature of the processing surface of the lap surface plate and a radius of curvature of the convex curved surface of the jig are the same. In the above-mentioned method for forming a crown of a floating magnetic head, the lapping plate is rotated, and the bar is swung in a direction orthogonal to a rotation direction of the lapping plate, so that the work surface of the bar is processed. And the processing surface of the lap surface plate are preferably moved relative to each other. Further, in the method of forming a crown of a floating magnetic head, a dummy bar having the same shape and the same material as the bar is provided in parallel with a longitudinal direction of the bar and separated from the bar. It is preferable that the lapping process is performed by sticking to the convex curved surface.

[0014] The crown forming apparatus of the present invention comprises: a lap surface plate having a concave curved processing surface; a jig having a convex curved surface;
Driving means for moving the jig and the processing surface relative to each other so that the convex curved surface of the jig faces the processing surface of the lap surface plate, wherein one or more floating magnetic head elements are provided. A substantially rectangular parallelepiped bar formed in a row on the side wall surface is deformed into an arc shape along the longitudinal direction with the surface to be processed being the lap surface side and attached to the convex curved surface of the jig. The bar is configured such that the work surface of the bar comes into contact with the work surface of the lap surface plate.

In the crown forming apparatus, it is preferable that a radius of curvature of the processing surface of the lap plate and a radius of curvature of the convex curved surface of the jig are the same. Also,
The driving means includes a rotation mechanism for rotating the lap surface plate, and holding the jig, pressing the work surface of the bar against the processing surface of the lap surface plate to move the jig to the lap surface. A swing mechanism for swinging in a direction orthogonal to the rotation direction of the board, wherein the bar is attached to the jig such that the longitudinal direction of the bar matches the swing direction of the jig. Features. Further, in the crown forming device, a dummy bar having the same shape and the same material as the bar is attached to the convex curved surface of the jig in parallel with a longitudinal direction of the bar and apart from the bar. Preferably, it is attached.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method and apparatus for forming a crown of a floating magnetic head according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a crown forming apparatus 1 according to the present invention. This crown forming device 1
A lap plate 2 provided on a table T, a jig 3 provided thereon, a driving means 10, a control plate S provided upright behind the lap plate 2, The oscillating plate 11 supported by the control panel S, the polishing liquid jet nozzle 16, and the correction ring 15 are mainly configured.

As shown in FIGS. 2A and 2B, the lapping platen 2 has a substantially disk-shaped overall shape and a processed surface 4 having a concave upper surface. The processing surface 4 is inclined downward toward the center of the lap surface plate 2.

The jig 3 has a columnar shape as shown in FIG. Further, a bar 21 is attached to the convex curved surface 6 as shown in FIGS. 4A to 4C. The bar 21 is formed by forming a large number of magnetic head elements on one surface of a wafer made of a material of a slider of a floating magnetic head by using a thin film forming technique or the like, and then cutting out a part of the wafer to form a substantially rectangular parallelepiped. . Bar 21
5A is cut out from the wafer such that a plurality of magnetic head elements 29 are arranged in a row on the side wall surface 23 as shown in FIG. 5A. Side wall surface 23 of bar 21
The upper surface (worked surface) 24 in contact with is the floating surface of the finally obtained floating magnetic head. As shown in FIG. 5B and FIG. 5C, the bar 21 has a top surface (working surface) 24 facing upward, and a bottom surface 25 facing the top surface 24 facing downward.
Are deformed in an arc along the longitudinal direction of the jig 3 and attached to the jig 3. To deform the bar 21, it is preferable to heat the bar 21 in advance.

As shown in FIG. 4A, a dummy bar 22 having the same shape and the same material as the bar 21 is provided on the convex curved surface 6 of the jig 3 in parallel with the longitudinal direction of the bar 21.
And pasted. In addition, as shown in FIG. 4A, an elastic sheet 30 may be interposed between the bar 21 and the dummy bar 22 and the convex curved surface 6. Elastic sheet 3
Numeral 0 is made of, for example, urethane , and its surface has adhesiveness, so that the bar 21 can be fixed to the convex curved surface 6. Further, the elastic sheet 30 may be omitted. In this case, the bar 21 and the dummy bar 22
It is fixed to the convex surface 6 with an adhesive, wax, or the like. The radius of curvature of the processing surface 4 of the lap surface plate 2 and the radius of curvature of the convex curved surface 6 of the jig 3 are the same.

As shown in FIG. 1, the driving means 10 presses the jig 3 against the processing surface 4 of the lap platen 2 by rotating the lapping plate 2 with a rotating mechanism 17 to rotate the jig 3. Board 2
And a swing mechanism 18 for swinging in a direction orthogonal to the rotation direction of The rotating mechanism 17 may be of any type as long as it rotates the lap platen 2. For example, as shown in FIG. 1, a motor 7 connected to the center of the lap surface plate 2 and rotating the lap surface plate 2 in the direction of arrow A may be used. The oscillating mechanism 18 includes an oscillating plate 11 provided on the front side of the control panel S, a convex portion 12 provided on an upper front portion of the oscillating plate 11, and a pair of right and left loads projecting downward from the convex portion 12. It comprises rods 13, 13 and load blocks 14 suspended from the load rods 13, 13.

As shown in FIG. 1, a support surface 19 is provided on the back side of the swing plate 11, and the lap surface plate 2 of the support surface 19 is provided.
The rail members 118, 118 shown in FIG.
And rail receiving members 119 and 119 are provided so as to engage with the rail members 118 and 118. The rail receiving members 119 and 119 are connected to the back surface of the swing plate 11, Are the rail members 118, 1
It is configured to be able to reciprocate left and right along 18.

On the front side of the support surface 19, a motor 120 and a link arm 123 are provided between the swing plate 11 and the support plate 19 as shown in FIG.
One end of a link arm 123 is rotatably connected to an end of an arm plate 122 attached to the rotation shaft 121 of the drive shaft 126 by a pin 125, and the other end of the link arm 123 is connected to a center of a drive plate 126 by a pin 127. In addition to being rotatably connected, rail receiving members 119 and 119 are attached to upper and lower portions of the driving plate 126, respectively.

With the above arrangement, the arm plate 122 is rotated with the rotation of the motor 120, whereby one end of the link arm 123 rotates eccentrically, and the other end of the link arm 123 connects the drive plate 126 to the rail member 118,
Since the reciprocating movement is performed right and left along 118, the swinging plate 11
Are swingable in the direction of arrow X in FIG.

As shown in FIG. 1, the convex curved surface 6 is attached to the load block 14 so as to face the processing surface 4 of the lap platen 2 and is wrapped by an elastic material (not shown) built in the load rods 13, 13. The jig 3 is biased toward the surface plate 2. Thus, the bar 21 and the dummy bar 22
Is pressed against the processing surface 4.

As shown in FIGS. 6 and 7, the jig 3 is disposed on the processing surface 4 so that the upper surface (working surface) 24 of the bar 21 and the processing surface 4 of the lapping plate 2 come into contact with each other. You. Also,
The bar 21 and the dummy bar 22 are preferably attached to the jig 3 such that the longitudinal direction of the bar 21 and the dummy bar 22 coincides with the swing direction of the jig 3.

As shown in FIG. 1, the polishing liquid jet nozzle 16
Is for spraying a polishing liquid toward the processing surface 4 of the lap surface plate 2. The correction ring 15 is fixed in contact with the processing surface 4 of the lap surface plate 2. The rotation of the lap surface plate 2 causes the processing surface 4 and the correction ring 15 to slide, so that the polishing liquid can be uniformly applied to the entire processing surface 4.

In order to form a crown on the upper surface (working surface) 24 of the bar 21 by using the above-described crown forming apparatus 1, the following operation is performed. First, a polishing liquid is sprayed from the polishing liquid jet nozzle 16 onto the processing surface 4. Next, the lapping plate 2 is rotated, and the bar 21 and the dummy bar 22 attached to the jig 3 are rocked in a direction orthogonal to the rotation direction of the lapping plate 2 while being pressed against the processing surface 4 by the rocking mechanism 18. Then, the bar 21 and the dummy bar 22 and the processing surface 4 are relatively moved, and the upper surface (work surface) 24 of the bar 21 and the dummy bar 22 and the processing surface 4 are slid with each other to lap the upper surface 24 of the bar 21. Is applied. At this time, the dummy bar 22
Is wrapped by the processing surface 4 in the same manner as the bar 21.

Here, the main part of the crown forming apparatus 1 is shown in FIG. 4, FIG. 6, and FIG. As shown in FIGS. 4A and 4B,
When the bar 21 is attached to the jig 3, the bar 21 is easily deformed into an arc shape along the longitudinal direction and closely adheres to the convex curved surface 6 of the jig 3, so that the upper surface 24 of the bar 21 extends along the longitudinal direction. The curvature radius is larger than the curvature radius of the convex curved surface 6 by the thickness of the bar 21 and the elastic sheet 30. Since the radius of curvature of the convex curved surface 6 and the processing surface 4 is the same, the radius of curvature of the upper surface 24 of the bar 21 is
Larger than the radius of curvature of. Next, as shown in FIG. 6, when the bar 21 is pressed against the processing surface 4,
The both ends in the longitudinal direction of the elastic sheet 3 are pressed by the processing surface 4.
0 is deformed, and the radius of curvature of the upper surface 24 becomes substantially equal to the radius of curvature of the processing surface 4. When the bar 21 is directly attached to the convex surface 6 with an adhesive, wax, or the like without using the elastic sheet 30, when the bar 21 is pressed against the processing surface 4, both ends in the longitudinal direction of the bar 21 The work surface 4 is pressed and deformed, and the radius of curvature of the upper surface 24 becomes substantially equal to the radius of curvature of the work surface 4.

The upper surface 24 of the bar 21 has substantially the same radius of curvature as the upper surface 24 and the processing surface 4 in the longitudinal direction.
Since the bar 21 is swung by the jig 3 in a direction parallel to the longitudinal direction of the bar 21, the bar 21 is uniformly lapped in the longitudinal direction of the bar 21.

Next, in the short direction of the bar 21, as shown in FIGS. 4C and 7, the bar 21 has high rigidity in the short direction and is hard to bend, so that the upper surface 24 is flat in the short direction. It has become. Therefore, as shown in FIG.
Both ends of the upper surface 24 in the short direction (shaded portions in the figure) are polished into abrasive grains and wrapped in the same manner as described above, and the upper surface 24 becomes a convex curved surface in the short direction. At this time, since the concave curved surface of the processing surface 4 is transferred to the upper surface 24 of the bar 21 and wrapped, the radius of curvature of the upper surface 24 in the short direction becomes the same as the radius of curvature of the processing surface.

In this manner, the bar 21 after the lapping process
As shown in FIG. 9A, the upper surface 24 is a convex curved surface that is convex in the short direction of the bar 21. By cutting the bar 21 at equal intervals in the longitudinal direction, a floating magnetic head 26 is obtained (FIG. 9B). This floating magnetic head 2
The floating surface 27 of the bar 6 is the upper surface 24 of the bar 21, and a crown 28 having the same radius of curvature as the processing surface 4 is formed on the floating surface 27.

In the above-described crown forming method for a floating magnetic head, a bar 21 in which a plurality of magnetic head elements are arranged in a row is attached to the convex curved surface 6 of the jig 3 and the bar 21 is attached to the concave curved processed surface 4. Since the lapping process is performed by pressing, it is possible to lap the floating surfaces of a plurality of floating magnetic heads at the same time, thereby improving the productivity of the floating magnetic head.

In the above-described crown forming method for the floating magnetic head, since the radius of curvature of the processing surface 4 of the lap surface plate 2 and the convex curved surface 6 of the jig 3 are the same, the bar 21 is
, Since both ends of the bar 21 are constantly pressed against the processing surface 4, the lapping process can be performed while the bar 21 is always deformed in an arc shape. In the above-described crown forming method for the floating magnetic head, when the bar 21 is pressed against the processing surface 4, the bar 21 is elastically deformed along the convex curved surface 6 of the jig 3, and the upper surface of the bar 21 is formed. (Work surface) 24
Can be made the same as the radius of curvature of the processing surface 4 so that the upper surface 24 of the bar 21 can be uniformly lapped with respect to the longitudinal direction of the bar 21. A convex curved surface having the same radius of curvature as the processing surface 4 can be formed in the short side direction. Also,
Since the above-mentioned convex curved surface is formed by transferring the shape of the processing surface 4, a crown having excellent dimensional accuracy of the shape can be obtained.

In the above-described method of forming a crown of a floating magnetic head, the bar 2 is rotated by rotating the lap plate 2 and swinging the jig 3 in a direction perpendicular to the rotation direction of the lap plate 2.
Since the workpiece 1 and the processing surface 4 move relative to each other, the lapping process can be performed efficiently. Further, since the bar 21 swings in a direction orthogonal to the rotation direction of the lap surface plate 2, the bar 21
No scratches along the rotation direction of the lapping plate 2 remain on the upper surface (working surface) 24 of the lapping plate 2. Also, the jig 3 is placed on the lapping plate 2
By oscillating in the direction orthogonal to the rotation direction, the bar 21 is uniformly contacted with the entire surface of the processing surface 4 and the lapping process is performed. The entire surface 4 is evenly worn to prevent deformation of the processed surface 4. Further, in the above-described method for forming a crown of a floating magnetic head, the bar 21 and the dummy bar 2
2 are attached to the jig 3 so that they are parallel to each other in the longitudinal direction, and the bar 21 and the dummy bar 22 are constantly pressed against the processing surface 4. On the other hand, the lapping process can be stably performed in contact with the processing surface 4, and a crown having excellent dimensional accuracy of the shape can be formed.

The above-described crown forming apparatus 1 includes a jig 3 on which a bar 21 in which a plurality of magnetic head elements are arranged in a row is mounted, a lap surface plate 2 having a processing surface 4 having a concave curved surface, and a drive. With the provision of the means 10, the floating surfaces of the plurality of floating magnetic heads can be simultaneously lapped. Further, since the jig 3 has the convex curved surface 6, it is possible to hold the bar 21 while deforming the bar 21 in an arc shape in the longitudinal direction.
A convex crown can be formed along the short side direction of. Further, in the crown forming apparatus 1 described above, when the radius of curvature of the processing surface 4 of the lap surface plate 2 is the same as the radius of curvature of the convex curved surface 6 of the jig 3, and the bar 21 is pressed against the processing surface 4. In addition, since both ends of the bar 21 are always pressed against the processing surface 4, the bar 21 is always deformed in an arc shape.
And a convex curved surface is formed by transferring the shape of the processed surface 4 in the short direction of the upper surface 24 of the bar 21, thereby forming a crown having excellent shape dimensional accuracy. be able to.

The above-described crown forming apparatus 1 is provided with the driving means 10 for rotating the lapping plate 2 and swinging the jig 3 in a direction orthogonal to the rotation direction of the lapping plate 2, so that the efficiency is improved. Wrap processing can be performed well. Further, since the bar 21 is swung in the longitudinal direction of the bar 21, the lapping process can be performed uniformly in the longitudinal direction of the bar 21. Further, since the bar 21 is swung in a direction orthogonal to the rotation direction of the lap surface plate 2, scratches along the rotation direction of the lap surface plate 2 may remain on the upper surface (work surface) 24 of the bar 21. Absent. Further, the jig 3 is swung in a direction orthogonal to the rotation direction of the lapping platen 2 so that the bar 21 is rotated.
Is uniformly contacted with the entire surface of the processing surface 4 and lapping is performed, so that a part of the processing surface 4 is not unevenly worn.
The entire surface of the processing surface 4 is evenly worn, so that the deformation of the processing surface 4 can be prevented. Furthermore, the above-described crown forming device 1
Since the bar 21 and the dummy bar 22 are attached to the jig 3 so as to be parallel to each other in the longitudinal direction, the bar 21 is stable without swinging in the short direction of the bar 21. As a result, the crown having excellent dimensional accuracy can be formed.

[0037]

As described above in detail, according to the method for forming a crown of a floating magnetic head of the present invention, a bar in which a plurality of magnetic head elements are arranged in a row is attached to a convex curved surface of a jig, and a concave curved surface is formed. Since the lapping process is performed in contact with the processing surface, the lapping process of the floating surfaces of the plurality of floating magnetic heads can be performed at the same time, and the productivity of the floating magnetic head can be improved.

In the method for forming a crown of a floating magnetic head according to the present invention, since the radius of curvature of the processing surface of the lap surface plate and the convex curved surface of the jig are the same, when the bar is pressed against the processing surface, Since both ends of the bar are always pressed against the processing surface,
Wrapping can be performed while the bar is always deformed in an arc shape. In the method for forming a crown of a floating magnetic head according to the present invention, when the bar is pressed against the processing surface, the bar is elastically deformed along the convex curved surface of the jig, and the length of the processing surface of the bar is reduced. Since the radius of curvature in the direction is the same as the radius of curvature of the processing surface, the processing surface of the bar can be uniformly lapped in the longitudinal direction of the bar and processed in the short direction of the bar. A convex curved surface having the same radius of curvature as the surface can be formed. Further, since the above-mentioned convex curved surface is formed by transferring the shape of the processed surface, a crown having excellent dimensional accuracy of the shape can be obtained.

In the method for forming a crown of a floating magnetic head according to the present invention, the lap plate is rotated, and the jig is swung in a direction perpendicular to the rotation direction of the lap plate so that the bar and the processing surface are relatively opposed to each other. Since it moves, the lapping process can be performed efficiently. Further, since the bar is swung in a direction orthogonal to the rotation direction of the lap surface plate, no scratch is left on the surface to be processed of the bar along the rotation direction of the lap surface plate. In addition, by swinging the jig in a direction orthogonal to the rotation direction of the lap surface plate, the bar is uniformly contacted with the entire surface of the processing surface and the lapping process is performed, so that a part of the processing surface is unevenly worn. Therefore, the entire surface of the processing surface is evenly worn, so that the deformation of the processing surface can be prevented. In the method for forming a crown of a floating magnetic head according to the present invention, the bar and the dummy bar are
The bar and the dummy bar are always pressed against the processing surface by attaching them to the jig so that they are parallel to each other in the longitudinal direction, so that the bar contacts the processing surface stably in the short direction of the bar Then, the lapping process can be performed, and a crown having excellent shape dimensional accuracy can be formed.

A crown forming apparatus according to the present invention includes a jig to which a bar in which a plurality of magnetic head elements are arranged in a row is attached, a lap surface plate having a concave curved processing surface,
Since the driving means is provided, the floating surfaces of the plurality of floating magnetic heads can be simultaneously lapped. Further, since the jig of the crown forming device of the present invention has a convex curved surface, it is possible to hold the bar while deforming the bar in an arc shape in the longitudinal direction, and to apply the bar to the surface to be processed of the bar. A crown that is convex along the short direction can be formed. Further, in the crown forming apparatus of the present invention, when the radius of curvature of the processing surface of the lap platen and the radius of curvature of the convex curved surface of the jig are the same, when the bar is pressed against the processing surface, both ends of the bar are processed. Since the bar is always pressed, the bar can be wrapped while the bar is always deformed in an arc shape, and the shape of the processed surface is transferred to the short side direction of the processed surface of the bar, and the convex curved surface is formed. Since it is formed, a crown having excellent shape dimensional accuracy can be formed.

In the crown forming apparatus of the present invention, the driving means rotates the lapping plate and swings the jig in a direction perpendicular to the rotation direction of the lapping plate, so that the lapping process can be performed efficiently. Can be. Further, since the bar is swung in the longitudinal direction of the bar, the bar can be uniformly lapped in the longitudinal direction of the bar.
In addition, since the bar is swung in a direction orthogonal to the rotation direction of the lap surface plate, no scratch is left on the work surface of the bar along the rotation direction of the lap surface plate. Furthermore, by the jig being swung in a direction orthogonal to the rotation direction of the lap plate,
Since the bar is evenly contacted with the entire surface of the processing surface and wrapped, a part of the processing surface is not unevenly worn.
The entire surface of the processing surface is evenly worn, so that the deformation of the processing surface 4 can be prevented. Furthermore, in the crown forming device of the present invention, the bar and the dummy bar are attached to the jig so as to be parallel to each other in the longitudinal direction. By stably contacting the processed surface without shaking, a crown having excellent dimensional accuracy of the shape can be formed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a crown forming device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a lap surface plate according to an embodiment of the present invention, wherein A is a perspective view and B is a side sectional view.

FIG. 3 is a perspective view showing a jig of the crown forming apparatus according to the embodiment of the present invention.

FIG. 4 is a view showing a jig of the crown forming apparatus according to the embodiment of the present invention, wherein A is a perspective view, B is a front sectional view, and C is a side sectional view.

FIG. 5 is an explanatory diagram illustrating a process of attaching a bar to a jig.

FIG. 6 is a front sectional view showing a main part of the crown forming apparatus according to the embodiment of the present invention.

FIG. 7 is a side sectional view showing a main part of the crown forming apparatus according to the embodiment of the present invention.

FIG. 8 is an explanatory diagram showing a process in which a bar is wrapped.

FIG. 9 is an explanatory view illustrating a process for obtaining a floating magnetic head from a bar.

FIG. 10 is a process diagram illustrating a first example of a conventional method for forming a crown of a floating magnetic head.

FIG. 11 is a process diagram illustrating a second example of a conventional method for forming a crown of a floating magnetic head.

FIG. 12 is a process diagram illustrating a third example of a conventional method for forming a crown of a floating magnetic head.

FIG. 13 is a schematic view showing a main part of a drive mechanism of the crown forming device according to the embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 crown forming device 2 lap surface plate 3 jig 4, processing surface 5 center axis 6 convex curved surface 7 motor 10 drive means 17 rotation mechanism 18 swing mechanism 21 bar 22 dummy bar 23 side wall surface 24 top surface (work surface) 26 floating type Magnetic head 27 Air bearing surface 28 Crown 29 Magnetic head element

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Isao Nakabayashi 1-7 Yukitani Otsuka-cho, Ota-ku, Tokyo Alps Electric Co., Ltd. F-term (reference) 3C049 AA07 AB04 AB08 AB09 CA01 CB01 3C058 AA07 AA09 AA11 AA12 AA16 AA19 AB08 AB09 AC04 BA02 BA09 BC02 CA02 CB01 CB03 DA16

Claims (8)

[Claims] A lapping process is performed on a surface of a substantially rectangular parallelepiped bar having at least one magnetic head element formed in a row on a side wall surface, the surface being processed adjacent to the side wall surface, and the bar is moved in a transverse direction. By cutting along the surface, the surface to be processed becomes an air bearing surface, and when manufacturing a floating magnetic head including at least one magnetic head element, a jig having a convex curved surface and a concave Using a lap surface having a processing surface, the bar is placed on the convex spherical surface of the jig with the work surface of the bar facing the lap surface, and the bar is formed in an arc shape along the longitudinal direction. And affixes the processed surface of the bar to the processed surface of the lap platen, and relatively moves the processed surface and the processed surface to wrap the processed surface. By processing, the floating magnetic head Crown forming method of a floating magnetic head, characterized in that to form a crown on the top surface. 2. The method for forming a crown of a floating magnetic head according to claim 1, wherein the radius of curvature of the processing surface of the lap surface plate is equal to the radius of curvature of the convex curved surface of the jig. 3. The lap plate is rotated, and the bar is swung in a direction orthogonal to the rotation direction of the lap plate, so that the processed surface of the bar and the processed surface of the lap plate are rotated. 3. The method for forming a crown of a flying magnetic head according to claim 1, wherein the relative movement of the crown is performed. 4. A dummy bar having the same shape and the same material as that of the bar is provided in parallel with the longitudinal direction of the bar.
The method for forming a crown of a floating magnetic head according to any one of claims 1 to 3, wherein the lap processing is performed by attaching the jig to the convex curved surface of the jig separately from the bar. 5. A lap surface plate having a concave curved surface, a jig having a convex surface, and the jig with the convex surface of the jig facing the processing surface of the lap surface. And a driving means for relatively moving the processing surface, and a substantially rectangular parallelepiped bar formed by forming at least one floating magnetic head element in a row on the side wall surface wraps the processing surface. It is deformed into an arc shape along the longitudinal direction on the side of the platen and attached to the convex curved surface of the jig so that the processed surface of the bar comes into contact with the processed surface of the lap surface plate. A crown forming apparatus characterized in that: 6. The crown forming apparatus according to claim 5, wherein a radius of curvature of the processing surface of the lap platen is equal to a radius of curvature of the convex curved surface of the jig. 7. A driving mechanism, comprising: a rotating mechanism for rotating the lap plate; holding the jig and pressing the processed surface of the bar against the processed surface of the lap plate; A swinging mechanism for swinging the jig in a direction orthogonal to the rotation direction of the lap platen, wherein the bar is provided with the jig such that a longitudinal direction of the bar coincides with a swinging direction of the jig. The crown forming device according to claim 5, wherein the crown forming device is attached to a crown. 8. A dummy bar having the same shape and the same material as the bar is provided in parallel with a longitudinal direction of the bar.
The crown forming device according to any one of claims 5 to 7, further comprising affixed to the convex curved surface of the jig at a distance from the bar.