JPH0785418A - Manufacturing method and jig for magnetic head - Google Patents

Abstract

PURPOSE:To obtain a manufacturing method for a magnetic head whereby the gap depth of a slider block in the magnetic head is well controlled. CONSTITUTION:It is necessary to grind a magnetic head of a magnetic disk apparatus so that the gap depth becomes a specified value (abbreviated as a depth lap hereinbelow). The end 5 of the depth is aligned and fixed in a state of a bar material with the upper end of an aligning dummy work 2 on a special grinding jig 1 to efficiently execute the depth lap. Accordingly, variation in the gap depth is restricted to be small, and many chips can be processed at one time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manufacturing method and a manufacturing jig for polishing a magnetic head gap depth to a prescribed value.

[0002]

2. Description of the Related Art A magnetic head records and reproduces similarly with a leakage magnetic flux of a magnetic gap, and a gap depth defining a gap facing area is an important factor for controlling the leakage magnetic flux. Particularly, when the gap depth becomes too large, the magnetic flux is short-circuited between the gap facing surfaces, and the reproduction efficiency deteriorates. Usually, for a magnetic head for HDD, for example, about 0 to 5 μm is optimum.

During the manufacturing process of the magnetic head, the gap depth is initially several tens of μm, so it is necessary to polish this until the desired gap depth. For example, in the case of a magnetic head for HDD, it is desired to polish the slider simultaneously with the ABS (air bearing surface) surface.
Since the gap depth of the work before polishing has variations, those within a certain range for each layer are attached to a flat polishing jig for each chip and polished. For the attachment of this flat polishing jig, the adhesive layer is made as thin as possible using an instant adhesive. For polishing, the surface of the work adhered to the flat polishing jig is placed on a tin plate coated with an abrasive with the surface of the work facing downward and pressed while rotating.

[0004]

SUMMARY OF THE INVENTION In the above conventional method,
Since it is necessary to attach each chip to a flat polishing jig, and the process for each layer is included, there is a problem in that the number of steps is large and the quality is stable. In addition, the gap depth must be measured for each chip in order to know the end point of the depth wrap, which also requires a large number of steps. Further, recently, there has been a problem that the size of the chip has been reduced and the work has become complicated, and that the number of treatments per surface with the surface grinding jig is limited.

In order to solve this problem, it is possible to polish in a block state without chipping. However, since the block height varies, the work height from the surface to which the surface grinding jig is attached varies. Therefore, there is a problem that the gap depth varies after polishing. Therefore, conventionally, it was not practical to polish in a block state.

[0006]

In order to solve the above-mentioned problems, the present invention makes the depth ends of a plurality of works flush with the reference surface of the polishing jig so as to be flush with each other and compared with the reference surface of the polishing jig. By adopting a magnetic head manufacturing method that simultaneously grinds a plurality of block-shaped works to the desired depth while measuring the work depth, the keeper insertion hole and the reference surface and the keeper that are placed at both ends of the keeper insertion hole are adopted. A polishing jig consisting of a keeper push-up spring and a keeper jig fixing screw placed on the bottom of the insertion hole is used, and more specifically, the process of attaching the work to the keeper and inserting the keeper into the keeper insertion hole of the dedicated jig. And the step of pressing both ends of the keeper with a micrometer so that both reference surfaces and the depth end of the work are aligned and the keeper is fixed in that state In the method of aligning the depth ends of a plurality of works with the reference surface of the special jig, which has three keeper jig fixing screws aligned in the work direction, the central screw is a ball screw. The dedicated jig described above is used.

[0007]

According to the above-mentioned means, since the depth ends of a plurality of block-shaped works are flush with each other, the gap depth of the block-shaped works after polishing varies regardless of the height of the works. Absent. Therefore, the block-shaped work can be used for polishing, and the work for each chip, which has been conventionally performed, becomes unnecessary.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an enlarged perspective view of the keeper 4 set on the depth lap jig. FIG. 2 is an enlarged perspective view when a work is stuck and fixed to the keeper 4, and FIG. 3 is an exploded enlarged perspective view showing a main part of a polishing jig which is an embodiment of the invention.

In FIG. 1, 2 is a positioning dummy for defining the position reference surface 2a, 3 is a work, 4 is a keeper, and 5 is a depth end of the work.

In FIG. 2, the work 3 is preliminarily positioned by a reference jig (not shown) so that the longitudinal direction of the work 3 is based on the reference surface 4a of the keeper 4 with respect to the work, and the work is adhered with wax. After that, the keeper 4 to which the work is attached is inserted into the keeper insertion hole 6 of FIG. 3, and the reference surface 2a of the left and right depth positioning dummies 2 is used as a reference in the height direction by the positioning jig 9 as shown in FIG. As shown in FIG. 4, the depth ends 5 and 2a of the work 3 are shown.
Adjust with a micrometer so that and are in the same position. When the adjustment is completed, the keeper 4 is fixed with the tightening fixing screws 7, 7 ', 7. Finally, the positioning dummy 2
Dummy jig 8 for grinding with a thicker dummy bar attached
Is fixed on the dedicated polishing jig 1. As a result, the work 3 can be accurately ground without directly contacting the grinding wheel. Further, it is desirable to use a screw having a ball-shaped tip for the middle keeper fixing screw because of the need for temporary fixing.

By using the above method, the work 3
Since there is no need to separate the layers to separate the depths, mass productivity is excellent and highly accurate depth polishing is possible.

Although the present invention has been specifically described above based on the embodiments, the present invention is not limited to the above embodiments and can be modified without departing from the gist of the contents.

For example, the position and the number of keeper insertion holes that can be attached to the polishing jig 1 are not particularly limited as long as they cannot be attached.

Further, the present invention is not limited to the depth polishing of the floating magnetic head for the magnetic disk device, but is applied to the polishing of various magnetic heads such as the head for the HD-VTR magnetic head device. it can.

[0015]

According to the present invention, the work 3 is separated,
After performing depth inspection, it is not necessary to layer-separate and fix with adhesive to perform depth wrap, and by setting the depth end on the positioning dummy, multiple workpieces can be depth lapped at the same time, which is excellent in mass productivity. High precision depth control is possible.

[Brief description of drawings]

FIG. 1 is an enlarged perspective view showing a main part when a keeper is set on a polishing jig that is an embodiment of the present invention,

FIG. 2 is an enlarged perspective view when a work is attached and fixed to a keeper,

FIG. 3 is a partially enlarged perspective view showing a main part of a polishing jig that is an embodiment of the present invention.

FIG. 4 is a perspective view showing a state in which a keeper jig is incorporated in a polishing jig and alignment is performed;

FIG. 5 is a perspective view showing a part of the work before separation, and FIG. 6 is a simplified view of a conventional embodiment.

FIG. 6 is a simplified representation of a conventional embodiment.

[Explanation of symbols]

 1 Polishing jig 2 Depth positioning dummy 2a Reference surface 3 Magnetic head slider block 4 Keeper 4a Reference surface for work of keeper 5 Depth end 6 Keeper insertion hole 7 Keeper fixing screw 7'Keeper fixing ball screw 8 Grinding dummy bar set jig 9 Work positioning jig 10 Cut line of magnetic head slider block 11 Slider 12 Depth length 13 Plane polishing jig

Claims (4)

[Claims] 1. A plurality of workpieces are desired while measuring the depth of the workpieces by aligning the depth ends of the plurality of workpieces with the reference surface of the polishing jig to make them flush with each other and comparing the depth ends of the workpieces with the reference surface of the polishing jig. Method of manufacturing a magnetic head in which polishing is performed up to the same depth. 2. A step of attaching a work to a keeper, a step of inserting the keeper into a keeper insertion hole of a dedicated jig, and a step of pressing both ends of the keeper with a micrometer to align the both reference surfaces with the depth end of the work. 2. A method of aligning the depth ends of a plurality of works with a reference surface of a dedicated jig according to claim 1, further comprising the step of fixing the keeper with a keeper fixing screw in this state. 3. A polishing jig for use in the manufacturing method according to claim 1, comprising a keeper insertion hole, a reference surface arranged at both ends of the keeper insertion hole, a keeper pushing spring arranged on the bottom surface of the keeper insertion hole, and a keeper jig fixing screw. Ingredient 4. The dedicated jig according to claim 2, which has three keeper jig fixing screws aligned in the work direction,
The manufacturing jig according to claim 3, wherein the central screw is a ball screw.