JPH03216806A - Magnetic head - Google Patents

Abstract

PURPOSE:To allow the administration of a gap depth with high accuracy by forming a hole for visually checking the position at the bottom end of the magnetic gap of a magnetic core from the outside in the joined state of a slider to this slider. CONSTITUTION:The sliders 2, 3 are joined on both side faces along the disk sliding direction of the magnetic core 1. The hole 5 is formed straight through the slider 3 so as to intersect orthogonally with the joint surface of the slider 3 to be joined to the magnetic core 1 and is formed in the part of the slider 3 facing the lower part of the gap 1e for recording and reproducing of the magnetic core 1. The position at the bottom end of the gap 1e for recording and reproducing of the magnetic core 1 can be visually checked from the outside toward an arrow A direction in the state of joining the sliders 2, 3 to the magnetic core 1 according to the structure formed with the hole 5 in the slider 3 in such a manner. The administration of the gap depth of the magnetic gap with the high accuracy is possible in this way.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic head that magnetically records or reproduces information by sliding a magnetic core against a magnetic recording medium, and particularly relates to a magnetic head that magnetically records or reproduces information by sliding a magnetic core against a magnetic recording medium. This invention relates to a magnetic head in which sliders for stabilizing movement are joined to both sides of a magnetic core along the sliding direction of a magnetic recording medium.

[Japanese technology 1] This type of magnetic head includes a magnetic head for a floppy disk drive (hereinafter referred to as FDD). The structure of the magnetic core and slider of a conventional FDD magnetic core is shown in FIG.

In FIG. 2, reference numeral 1 denotes a magnetic core, which consists of a front core 1a=ld and a bank core (not shown), and records information on the disk sliding surface (upper surface in the figure) on which the disk of a magnetic recording medium (not shown) slides. A reproducing gear arm 1e and an erasing gap if are formed.

front core la. lb is connected via gear sop 1e, and front core IC. ld is gear sob 1. They are joined via f. Further, the front cores lb and ld are bonded with epoxy resin or the like or welded with glass.

Further, in FIG. 2, reference numerals 2 and 3 are sliders for stabilizing the sliding movement between the magnetic core I and the disk, and they are formed from ceramic into a block shape with an L-shaped cross section. A groove 2a is formed in the moving surface. The sliders 2 and 3 are bonded to both side surfaces of the magnetic core 1 along the disk sliding direction by adhesion using epoxy resin or glass welding so as to sandwich the magnetic core 1 therebetween.

In the manufacturing process of a magnetic head, the magnetic core l and sliders 2 and 3 are
After joining, as shown in FIG. 3, the upper surfaces of the magnetic core l and sliders 2 and 3 are ground and lapped to form a disk sliding surface. The finished surface of the disk sliding surface is indicated by a triangular symbol. When performing this grinding and lapping, the finishing dimension of the disk sliding surface from the processing reference surface 4 formed by the lower end surfaces of the sliders 2 and 3 is determined by the final gap depth d3 of the recording/reproducing gap le. :: is very important because it affects the characteristics of the magnetic head.

In order to obtain the finished dimension L1, conventionally the magnetic core l
In the single state shown in FIG. 2, the height dimension d11 from its lower end to the lower end of the recording/reproducing gap le (the end of the gap in the gap width direction) is measured in advance, and this dimension d12 is set as the height dimension d12. Height dimension dυ of the lower end of the recording/reproducing gap 1e from the processing reference plane 4 shown in Figure 3. Close and dimension d1. And the gap fat d3 that I want to get in the end. The finished dimension L11 is determined by the sum of the above. Since the gap thickness of the erasing gap If has little effect on the erasing characteristics, a method of managing the gap thickness of the recording/reproducing gap is used as a reference. [Problems to be Solved by the Invention] However, in the above-mentioned conventional example, due to dust adhering to the processing reference surface 4 and misalignment when the core l is sandwiched between the sliders 2.3, the magnetic core l is the machining reference plane 4
In some cases, the height may rise even further than the dimension LL. In this case, the height dimension d> is smaller than the dimension dhj. As the height increases, the finished dimension h, is changed to dLi + d3, as shown above.
If so, there was a drawback that the desired gap d3 could not be obtained.

In Fig. 4, it will be difficult to control the process unless the floating dimension L2 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. .

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks in this type of magnetic head 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, a slider for stabilizing the sliding movement between the magnetic core and the magnetic recording medium is arranged along the sliding direction of the magnetic recording medium in the magnetic core. In the magnetic head that is bonded to both sides, a structure is adopted in which a hole is formed in the slider for visually confirming the position of the lower end of the magnetic gap of the magnetic core from the outside when the slider is bonded to the magnetic core.

[Function] According to this structure, when the slider is joined to the magnetic core, the position of the lower end of the magnetic gap of the magnetic core can be visually confirmed from the outside through the hole of the slider, and the magnetic The height dimension of the lower end of the magnetic gap from the processing reference plane of the sliding movement of the recording medium can be accurately measured.

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

FIG. 1 shows the structure of a magnetic core and slider assembly of an FDD magnetic head according to an embodiment of the present invention. In this figure, parts common or corresponding to those in the conventional example shown in FIG. 2 are given the same reference numerals, and explanations of the common parts will be omitted.

In FIG. 1, sliders 2 and 3 are joined to both sides of the magnetic core l along the disk sliding direction, as in the conventional example.
Here, the magnetic core 1 and one slider 2 are common to the conventional example, but the other slider 3 is different from the conventional example in that a hole 5 is formed.

The hole 5 is formed to have a rectangular cross-sectional shape, and is formed to pass straight through the slider 3 so as to be perpendicular to the bonding surface that is bonded to the magnetic core l of the slider 3.
It is formed at a portion of the magnetic core l facing the lower part of the recording/reproducing gap le.

According to the structure in which the hole 5 is formed in the slider 3 in this way,
As shown in the figure, with the sliders 2 and 3 joined to the magnetic core I, the position of the lower end (end in the gap width direction) of the recording/reproducing gap le of the magnetic core I can be visually confirmed from the outside in the eight directions of the arrows. Therefore, it is possible to accurately measure the height dimension of the lower end of the gap 1e from the processing reference surface 4 in the grinding and lapping process of the disk sliding surface mentioned above, and the gap thickness of the gap Ie can be controlled with high precision, thereby improving the yield of magnetic heads. .

Although the hole 5 is formed in the slider 3 in the above description, it may be formed in the slider 2 or both of the sliders 2 and 3. Further, the hole 5 only needs to be able to visually recognize the lower end of the gap 1e, and its cross-sectional shape may of course be other shapes such as circular or triangular.

[Effects of the Invention] As is clear from the above description, according to the present invention, the slider for stabilizing the sliding movement between the magnetic core and the magnetic recording medium is attached to both sides of the magnetic core along the sliding direction of the magnetic recording medium. In the magnetic head that is bonded to the magnetic core, we have adopted a structure in which a hole is formed in the slider for visually confirming the position of the lower end of the magnetic gap of the magnetic core from the outside when the slider is bonded to the magnetic core. In a slider assembly, the height of the lower end of the magnetic gap from the processing reference plane of the sliding surface of the magnetic recording medium can be accurately measured, the gap thickness of the magnetic gap can be managed with high precision, and the yield of magnetic heads can be improved. You can get the same effect.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the structure of a joined body of a magnetic core and a slider constituting a magnetic head for FDD according to an embodiment of the present invention, FIG. 2 is a perspective view of a magnetic core and a slider of a conventional magnetic head for FDD, FIG. 3 is an explanatory diagram of a method for determining the finished dimensions of the disk sliding surface in a magnetic core and slider assembly, and FIG. 4 is an explanatory diagram showing the lifting of the magnetic core from the processing reference plane. l...Magnetic core ■a~1d...-Front core 2, 3-...Slider 4...-Machining reference surface 5--Hole TA receiver for visual confirmation of the lower end of the gap\Core histwriter H , 4〉Tsaitsu of the mantle, Mouth Figure 1

Claims (1)

[Claims] 1) In a magnetic head in which sliders for stabilizing the sliding movement between the magnetic core and the magnetic recording medium are bonded to both side surfaces of the magnetic core along the sliding direction of the magnetic recording medium, the slider is bonded to the magnetic core. 1. A magnetic head characterized in that a hole is formed in a slider for visually confirming the position of the lower end of a magnetic gap of a magnetic core from the outside in a state where the magnetic core is in a state where