JPH03216810A - Production of magnetic head - Google Patents

Abstract

PURPOSE:To allow the administration of a gap depth with high accuracy by measuring the size from a working reference plane down to the bottom end of the magnetic gap of a magnetic core and subjecting the joined body obtd., by the ensuing stage to working at the finish size corresponding to the size obtd. by the measurement. CONSTITUTION:The magnetic core 1 and a 1st slider 2 are joined by adhesion using an epoxy resin, etc. The rear surface of the joined body of the magnetic core 1 and the slider 2 is pressed to the working reference plane 4 of a disk sliding surface and the size l3 from the working reference plane 4 to the bottom end 1g of the gap for recording and reproducing of the magnetic core 1 is optically measured. The 2nd slider 3 is joined by adhering or glass welding to the magnetic core 1 and the front surface of the joined body is finished by grinding. The finish size l1 is the total of the size l3 obtd. by the measurement and the gap depth d3 of the gap for recording and reproducing desired to be finally obtd. The administration of the gap depth of the magnetic core with the high accuracy is possible in this way and the yield is improved.

Description

Detailed Description of the Invention [Field of Industrial Application J] The present invention relates to a method of manufacturing a magnetic head for magnetically recording or reproducing information on a magnetic recording medium, and in particular to a method for manufacturing a magnetic head that magnetically records or reproduces information on a magnetic recording medium. The present invention relates to a method of manufacturing a magnetic head, in which first and second sliders are joined to both side surfaces of a magnetic core along the sliding direction of a magnetic recording medium.

[Prior Art] As the above-mentioned type of magnetic head, there is a magnetic head for a floppy disk drive device (hereinafter referred to as FDD).

FIGS. 4 and 5 show the steps from the joining process of the magnetic core and the first and second sliders to the processing process of the disk sliding surface of the assembled body obtained by this process by the conventional manufacturing method of a magnetic head for FDD. explain.

FIG. 4 shows the structure of the magnetic core and the first and second sliders.6 The magnetic core l consists of front cores la-1d, and is a disk sliding surface on which a disk of a magnetic recording medium (not shown) slides. A recording/reproducing gap le and an erasing gap 1f are formed on the top surface in the figure. front core 1a,
1b are joined through a gap le, and the front core lc
．． 1d are joined through a gap If.

Also front core lb. 1d is bonded with epoxy resin or glass welded.

The first and second sliders 2.3 are made of ceramic and are formed into blocks having an L-shaped cross section, and a disk sliding surface of the slider 2 is formed with a groove 2a.

As shown in Fig. 5, the sliders 2 and 3 are joined to both sides of the magnetic core 1 along the disk sliding direction, but in the past, the magnetic core 1 was sandwiched between the sliders 2 and 3, and epoxy resin was applied to the joint surfaces. Three members are joined at the same time by pouring an adhesive such as or by pouring and welding a welding glass. After this joining, the magnetic core l and slider 2 shown in FIG.
The upper surface of the joined body No. 3 in the figure is ground and lapped to finish it as a disk sliding surface. The finished surface of the disk sliding surface is indicated by a triangular symbol. This processing is performed with a finished dimension L1 based on the processing reference surface 4 against which the lower surface of the joined body is abutted. It is done in

Determining the finished dimension l/1: here means determining the final gap depth d3: of the recording/reproducing gap le, which is very important as it affects the characteristics of the magnetic head. Finished dimensions! 1, conventionally the magnetic core l
In the single state shown in FIG. 4, measure in advance the height dimension dll from its lower end to the lower end of the recording/reproducing gap le (the end of the gap in the gap width direction) Ig,
This dimension di-1 and the final gap thickness d3
The finished dimension t1 is determined by the sum of ゛. Since the gap thickness of the erasing gap If has little influence on the erasing characteristics, a method of managing the gap thickness of the recording/reproducing gap is used as a reference.

[Problem to be solved by the invention J However, at the stage of machining the disk sliding surface, the fifth
It is fine if the lower surface of the magnetic core l is in contact with and aligned with the machining reference surface 4 as shown in the figure, but due to dust attached to the machining reference surface 4 or misalignment when the core l is sandwiched between the sliders 2.3, etc. , as shown in FIG. 6, there is a case where the magnetic core l is lifted from the machining reference surface 4 by a dimension β2.

In this case, the conventional method of determining the finished dimension 2 as described above does not include the floating dimension β2, so there is a drawback that the final desired gap depth d3 cannot be obtained.

In Fig. 6, it will be difficult to control the process unless the floating dimension β2 of the magnetic core l is kept below 5 μm, but in reality it is 2 μm or less.
Lifting may occur up to about 0 μm, and in this case, there was a problem that the gap thickness was distorted and the electrical characteristics of the magnetic head (for example, recording and reproduction output voltage, resolution, etc.) deteriorated, and the yield of the magnetic head decreased. .

Further, the magnetic core 1 is usually made of ferrite, is thin, small, and easily chipped, and is difficult to handle when used alone. It is difficult to measure the dimension d1 from the lower end of the magnetic core l to the lower end 1g of the recording/reproducing gap as described above in this difficult-to-handle state, and if done incorrectly, the magnetic core l may be damaged. There was a problem.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to eliminate the above-mentioned drawbacks in a method of manufacturing a magnetic head of this type, and to enable gap debris to be managed with high precision.

[Means for Solving the Problems] In order to solve the above problems, according to the present invention, the first and second sliders for stabilizing the sliding movement between the magnetic core and the magnetic recording medium are connected to the magnetic recording medium of the magnetic core. In the method for manufacturing a magnetic head that is bonded to both sides along the sliding/moving direction of the medium, the first
A step of joining the slider and the magnetic core, and a step of measuring the dimension from the processing reference surface to the lower end of the magnetic gap of the magnetic core when processing the sliding surface of the magnetic recording medium after the bonded body obtained in this step. After this step, a step of bonding a second slider to the magnetic core, and a step of machining the magnetic recording medium sliding surface of the bonded body obtained by this step with finished dimensions according to the dimensions obtained in the above measurement. We adopted a configuration with

F Effect J According to such a configuration, even if the magnetic core floats from the machining reference surface during machining of the media sliding surface, the dimension r7 is included in the above measurement dimension and added to the finished dimension, so the magnetic The effect of core floating can be eliminated and gap fat can be managed with high precision.

[Example] Hereinafter, details of embodiments of the present invention will be described with reference to the drawings.

First Embodiment FIGS. 1 and 2 show a joined body obtained from the step of joining a magnetic core and a first and second slider in the manufacturing process of a magnetic head for FDD as a first example of the present invention. The process up to the processing of the disk sliding surface will be explained. The magnetic core l and the first and second sliders 2 and 3 shown in both figures and FIG. 3, which will be described later, are the same as those shown in FIGS. 4 to 6, which explain the conventional example.

In the process of this embodiment, first, as shown in FIG. 1, the magnetic core 1 and the first slider 2 are joined by adhesion with epoxy resin or glass welding. Next, as shown in FIG. 1, the lower surface (the surface opposite to the disk sliding surface) of the assembled magnetic core l and slider 2 is brought into contact with the processing reference surface 4 of the disk sliding surface mentioned above, and the processing reference The dimension β from the surface 4 to the lower end 1g of the recording/reproducing gap le of the magnetic core 1 is optically measured. Here, the magnetic core l is measured from the machining reference plane 4! 2, and only the lower surface of the slider 2 is in contact with the machining reference surface 4. This floating dimension t
2z and the dimension d1 from the lower end of the magnetic core l to the lower end of the gap 1g becomes the measured dimension 123.

Next, as shown in FIG. 2, the second slider 3 is bonded to the magnetic core l of the assembled body of the magnetic core l and the slider 2 by adhesive or glass welding, and the magnetic core 1 and slider 2 thus obtained are bonded. , 3 is ground and lapped to finish it as a disk sliding surface.

In this case, the finished dimension β1 from the processing reference surface 4 to the finished surface of the disk sliding surface of the above-mentioned assembly is the difference between the dimension L3 obtained in the above measurement and the gap depth d3 of the recording/reproducing gap 1e that is desired to be finally obtained. Total.

In this way, in this embodiment, even if the magnetic core l is floating from the processing standard 4, the floating dimension t2 is the dimension [
3 and is added to the finished dimension i/l,
The effect of floating magnetic core I can be eliminated, gap fat d
3 can be controlled with high accuracy by machining the disk sliding surface, and the yield of magnetic heads can be improved.

Further, in the process of this embodiment, the work of measuring the dimension 13 can be easily carried out with the magnetic core 1 connected to the slider 2 in an easy-to-handle state, and the manufacturing process can be simplified accordingly compared to the conventional method.

Second Embodiment Next, FIG. 3 illustrates a second embodiment of the present invention.

In this embodiment, the magnetic core l and the slider 2 are joined in the same way as in the first embodiment, and after adding Jj1 to the dimension L3 from the machining reference surface 4 to the lower end of the gap 1g, the slider 3 is attached to the magnetic core l.
In this case, as shown in FIG. 3, the slider 3 is intentionally shifted from the processing reference surface 4 by a predetermined distance L4. After this, as in the first embodiment, the sum of the dimension L3 and the gap thickness d3 to be obtained is determined as the finishing dimension t.
The disk sliding surface is machined as 1.

According to this embodiment, it is possible to prevent the slider 2 from floating away from the processing reference surface 4 due to the joining position of the slider 3 and affecting the gap fat.

[Effects of the Invention] As is clear from the above description, according to the present invention, the first and second
A method of manufacturing a magnetic head in which a first slider is joined to both sides of a magnetic core along the sliding direction of a magnetic recording medium includes a step of joining a first slider and a magnetic core, and a joined body obtained in the step. a step of measuring the dimension from the processing reference surface to the lower end of the magnetic gap of the magnetic core when later processing the sliding surface of the magnetic recording medium; and a step of bonding a second slider to the magnetic core after the step; Since we have adopted a configuration that includes a step of processing the magnetic recording medium sliding surface of the assembled body obtained from the process number to a finishing dimension according to the dimension obtained by the measurement, the magnetic core will meet the processing standard when processing the medium sliding surface. Even if the magnetic head is floating from the surface, its influence can be eliminated, the gap thickness of the magnetic core can be managed with high precision, and the yield of magnetic heads can be improved. It also has the excellent effect of simplifying the manufacturing process of the magnetic head.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the process of joining the magnetic core and the first slider and measuring dimensions according to the first embodiment of the present invention, and FIG. 2 is an explanatory diagram of the process of joining the second slider and processing the disk sliding surface according to the same embodiment. FIG. 3 is an explanatory diagram showing the joining state of the magnetic core and slider according to the second embodiment, FIG. 4 is a perspective view of the magnetic core and slider of the FDD magnetic head, and FIG. 5 is a diagram of the conventional disk. FIG. 6 is an explanatory diagram illustrating a method of determining the finished dimensions of a sliding surface, and FIG. 6 is an explanatory diagram illustrating lifting of a magnetic core from a processing reference plane. l-・1 magnetic core laA-1d...Freon 2, 3...Slider 4...Machining reference surface core

Claims (1)

[Claims] 1) A magnetic device in which first and second sliders for stabilizing the sliding movement between the magnetic core and the magnetic recording medium are joined to both sides of the magnetic core along the sliding direction of the magnetic recording medium. In a head manufacturing method, a step of joining a first slider and a magnetic core, and a magnetic gap of the magnetic core from a processing reference surface when processing a magnetic recording medium sliding surface after the bonded body obtained in the step. A step of measuring the dimension to the bottom end, a step of bonding a second slider to the magnetic core after the step, and a step of measuring the magnetic recording medium sliding surface of the bonded body obtained by the step according to the dimension obtained in the measurement. A method of manufacturing a magnetic head, comprising a step of processing the magnetic head to a finished size.