JPH08102010A - Production of magnetic head - Google Patents

Abstract

PURPOSE: To obtain a magnetic head having excellent electromagnetic conversion characteristics by eliminating the variation in gap depths. CONSTITUTION: Magnetic head chips 1 and auxiliary core materials 2 are arranged alternately in plurality on reference planes 4 of jigs. Next, the magnetic head chips 1 are pressed to verge the rear ends 1b of the magnetic head chips 1 on groove parts 7 formed on the reference planes 4 of the jig. The magnetic head chips 1 and the auxiliary core materials 2 are thereafter fused with glass and are subjected to depth polishing and cutting, by which the magnetic heads are completed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a magnetic head suitable for writing and / or reading an information signal to / from a magnetic recording medium such as a floppy disk.

[0002]

2. Description of the Related Art To manufacture a magnetic head for a floppy disk, first, a magnetic head chip having a recording / reproducing gap and an erasing gap and forming a closed magnetic path is formed.

Next, as shown in FIG. 5, this magnetic head chip 101 serves as an auxiliary core material 1 which functions as a slider.
02 so as to be sandwiched by the magnetic head chip 10
1 and the auxiliary core material 102 are alternately arranged on the reference surface 104 of the jig 103.

Next, the arranged magnetic head chips 101.
Then, the auxiliary core material 102 is pressed against the reference surface 104 of the jig 103. After that, the magnetic head chips 101 and the auxiliary core material 102 are fused to each other by glass, so that they are joined and integrated.

Next, the block integrated and joined is cut to attach the magnetic head chip 101 to the pair of auxiliary core materials 1.
A magnetic head block sandwiched by 02 is formed.

Then, the magnetic head block is polished to obtain a predetermined gap depth, and
The magnetic head is completed by performing predetermined groove processing and the like.

[0007]

However, due to variations in height caused by the processing accuracy of the magnetic head chip 101 and the auxiliary core material 102, improper pressing from the top, and the like,
As shown in FIG. 6, the magnetic head chip 101 has a jig 10
3 is in a state of being lifted from the reference plane 104. That is, the gap H is formed between the reference surface 104 and the magnetic head chip 101.

In this state, the subsequent glass fusion is performed,
When the gap depth is polished, there is a gap H, so that the gap depth of each magnetic head chip 101 varies. The depth polishing process is performed by polishing the medium sliding surface 101a on the opposite side of the reference surface 104 of the jig 3, and the medium sliding surface 101a is at a position protruding more than necessary from the auxiliary core material 102. And, I can't give accurate depth.

As described above, when the gap depth varies, it appears as a variation in the electromagnetic conversion characteristics between the magnetic heads. In order to solve this, the dimensional accuracy of the magnetic head chip 101 and the auxiliary core material 102 may be strictly controlled, but if this is done, processing time will increase and the cost of parts will increase.

Therefore, the present invention has been proposed in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a method of manufacturing a magnetic head which can eliminate variations in the gap depth and provide an inexpensive magnetic head. And

[0011]

The present invention is a method of manufacturing a magnetic head in which a magnetic head chip is sandwiched by auxiliary core materials from the thickness direction thereof. In order to manufacture this magnetic head, first, a plurality of magnetic head chips having a recording / reproducing gap and an erasing gap and auxiliary core materials are alternately arranged on the reference surface of the jig. On the reference surface of the jig for arranging the magnetic head chip and the auxiliary core material, a groove is formed corresponding to each magnetic head chip so as to face the chip rear end of the magnetic head chip. Then, the magnetic head chip and the auxiliary core material are bonded with glass. Next, the joined blocks are cut and depth-polished to form a magnetic head.

The width of the groove formed on the reference surface of the jig is made larger than the thickness of the magnetic head chip so that the chip rear end of the magnetic head chip can fit in the groove. For example, the width of the groove is 1.0 mm and the depth of the groove is 0.01 mm.
mm.

[0013]

According to the present invention, the tip end portion of the magnetic head chip is positioned at a position corresponding to each magnetic head chip on the reference surface of the jig on which the plurality of magnetic head chips and the auxiliary core material are arranged. Since the groove portion is provided, when the magnetic head chip is pressed against the reference surface side, the chip rear end portion of the magnetic head chip projects into the groove portion. For this reason,
In the depth polishing process to be performed thereafter, there is no gap between the jig and the magnetic head chip. Therefore, if the chip rear end is used as a reference, polishing can be performed to a predetermined gap depth.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments to which the present invention is applied will be described in detail below with reference to the drawings.

In order to manufacture a magnetic head, first, a magnetic head chip having a recording / reproducing gap and an erasing gap and forming a closed magnetic path is manufactured. To manufacture the magnetic head chip 1, a magnetic core made of ferrite having a predetermined shape is bonded by glass or the like.

Next, as shown in FIG. 1, the manufactured magnetic head chip 1 is used as an auxiliary core material 2 which functions as a slider.
The magnetic head chips 1 and the auxiliary core materials 2 are alternately arranged on the reference surface 4 of the jig 3 so as to be sandwiched by the plate thickness direction.

When mounting the magnetic head chip 1, as shown in FIG. 2, the magnetic head chip 1 is placed on the base 3 so that the recording / reproducing gap g ₁ and the erasing gap g ₂ face upward. In the magnetic head chip 1 here, the back depth indicated by B in the figure is set to a predetermined dimension in advance in the head manufacturing stage, but the gap depth indicated by A in the figure is set to a predetermined dimension in the subsequent depth polishing step. Therefore, the size is set to be equal to or larger than the predetermined gap depth.

The jig 3 is a mounting block 5 having a rectangular parallelepiped shape in which a plurality of magnetic head chips 1 and auxiliary core materials 2 are arranged, and the magnetic head chips 1 and auxiliary core materials 2 are attached to each other. It is composed of a pad block 6.

The mounting block 5 is formed as a rectangular block having a size sufficient for arranging the plurality of magnetic head chips 1 and the auxiliary core material 2. As shown in FIG. 3, on the reference surface 4 which is the mounting surface of the mounting block 5,
A groove portion 7 having a shallow groove depth is formed at a position facing each magnetic head chip 1 when the auxiliary core material 2 and the magnetic head chip 1 are alternately arranged.

The groove portion 7 is formed in a direction orthogonal to the longitudinal direction of the mounting block 5, and the groove width is wider than the thickness of the magnetic head chip 1. The groove portion 7 is
Since the chip rear end portion 1b of the magnetic head chip 1 is made to face the groove portion 7, it is at least wider than the thickness of the magnetic head chip 1 and an error caused by the arrangement pitch of the magnetic head chip 1 and the auxiliary core material 2 is also generated. It has a width that can be absorbed.

Regarding the groove depth, the chip rear end portion 1
Since it suffices that b is flush with the end surface of the auxiliary core material 2 or slightly protrudes from the auxiliary core material 2, it may have a very small depth. In this embodiment,
The groove 7 had a depth of 0.01 mm and a width of 1.0 mm.

When arranging the magnetic head chip 1 and the auxiliary core material 2 on the jig 3 having the above structure, the magnetic head chip 1 and the auxiliary core material 2 are alternately arranged while being pressed against the contact block 6 side.

Next, when the magnetic head chip 1 and the auxiliary core material 2 are arranged, as shown in FIG. 4, the magnetic head chip 1 and the auxiliary core material 2 are applied with a predetermined pressing force F, The magnetic head chip 1 and the auxiliary core material 2 are pressed against the reference surface 4.

Then, as shown in FIG. 4, the chip rear end 1b of the magnetic head chip 1 abuts on the bottom surface of the groove 7. That is, the chip rear end portion 1b of the magnetic head chip 1 projects from the end surface of the auxiliary core material 2. Further, the surface 1 a that becomes the medium sliding surface of the magnetic head chip 1 also projects from the end surface of the auxiliary core material 2.

Next, the magnetic head chip 1 and the auxiliary core material 2 are joined and integrated by glass fusion. And
The bonded and integrated block is cut to manufacture a magnetic head block in which the magnetic head chip 1 is sandwiched by a pair of auxiliary core materials 2.

After cutting into blocks, the magnetic head chip 1
The surface 1a, which is the sliding surface of the medium, is polished so that the magnetic gap g
The depth of ₁ and g ₂ is set to a predetermined gap depth. In this depth polishing step, since the tip rear end 1b of the magnetic head chip 1 projects only slightly from the end face of the auxiliary core material 2, the depth rear polishing is performed using this tip rear end 1b as a reference surface for polishing.

As described above, when the depth polishing is performed using the tip rear end portion 1b of the magnetic head chip 1 as the polishing reference, the back depth B is known in advance, so that the back depth B is determined from the total height of the head after polishing. A predetermined gap depth can be obtained by pulling. Therefore, the depths of the magnetic gaps g ₁ and g ₂ of the magnetic head chip 1 can be made highly accurate, and variations in the gap depths can be suppressed and variations in electromagnetic conversion characteristics can also be suppressed. Further, since the dimensional accuracy of the magnetic head chip 1 can be relaxed to some extent, the processing time can be shortened.

Finally, a magnetic head for a floppy disk is completed by performing groove processing or the like.

[0029]

As is apparent from the above description, according to the method of the present invention, the magnetic head chip and the auxiliary core member are arranged on the reference plane of the jig on a position facing the magnetic head chip. , Since the groove that faces the chip rear end of this magnetic head chip is provided, the chip rear end will protrude into this groove, and in the depth polishing that is performed after that, the chip rear end is used as a reference for polishing. by doing,
It can be processed to a predetermined gap depth. Therefore, variations in the gap depth of the magnetic head can be eliminated, and variations in the electromagnetic conversion characteristics can be suppressed.

Further, since the chip rear end portion of the magnetic head chip can be depth-polished with the depth-polishing standard, the component dimensional accuracy of the magnetic head chip can be made somewhat rough. Therefore, since it is possible to shorten the processing time of the parts, it is possible to reduce the cost.

[Brief description of drawings]

FIG. 1 is a perspective view showing a step of setting a magnetic head chip and an auxiliary core material on a jig.

FIG. 2 is an enlarged perspective view of essential parts showing a state in which a magnetic head chip is set on an auxiliary core material.

FIG. 3 is a main part enlarged perspective view showing a step of setting a magnetic head chip and an auxiliary core material in a jig and showing a state in which a groove is provided in the jig.

FIG. 4 is a main part enlarged perspective view showing a step of pressing a magnetic head chip and an auxiliary core material against a reference surface of a jig, showing a state in which a chip rear end part of the magnetic head chip faces a groove portion. .

FIG. 5 is a perspective view showing a step of setting a magnetic head chip and an auxiliary core material on a conventional jig.

FIG. 6 is a front view showing a step of setting a magnetic head chip and an auxiliary core material in a conventional jig, showing a state in which the magnetic head chip is lifted from a reference surface of the jig.

[Explanation of symbols]

 1 magnetic head chip 1a medium sliding surface 1b chip rear end 2 auxiliary core material 3 jig 4 reference surface 5 mounting block 6 mounting block

Claims (3)

[Claims] 1. A plurality of magnetic head chips having a recording / reproducing gap and an erasing gap and an auxiliary core material are alternately arranged on a reference surface of a jig, and then these magnetic head chips and the auxiliary core material are bonded by glass. When manufacturing the magnetic head in which the joined blocks are cut and the magnetic head chip is sandwiched by a pair of auxiliary core materials, the magnetic head chip is provided on the reference plane of the jig in correspondence with each magnetic head chip. A method of manufacturing a magnetic head, characterized in that a groove is formed so as to face the rear end of the chip. 2. The method of manufacturing a magnetic head according to claim 1, wherein the width of the groove is wider than the thickness of the magnetic head chip. 3. The method of manufacturing a magnetic head according to claim 1, wherein the groove has a depth of 0.01 mm and a width of 1.0 mm.