JPS6379207A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To obtain a stable magnetic characteristic by using a side face of a grinding wheel tilted to a gap forming face of a magnetic head core so as to work a winding window thereby sharpening the edge of the boundary between the winding window and the gap forming face. CONSTITUTION:A base 2 is fixed to a V-groove of a jig 3, the cutting edges cut a slot to the base 2 and the side face 5 of the grinding wheel 1 forms a slope 4. Loci of abrasive grain of the slope 4 are lots of circular arcs and to large flaw is caused. Thus, it is not required to grind the slope 4 by a cup wheel or the like, the edge of the boundary between the winding window 16 and the gap forming face 18 is sharpened to obtain the stable magnetic characteristic.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a magnetic head, and more particularly to a method of processing a winding window formed in the vicinity of the lower gap of a magnetic head core.

[Prior Art] Processing operations for a conventional magnetic head will be described below with reference to FIG.

First, a large number of track grooves 14 are formed in the substrate I3 made of magnetic material. Next, glass 15 is molded into the track groove 14, a boat-shaped winding window 16 is cut and the joint surface 18 is mirror polished. Next, attach the gap spacer portion 19 (SiO, etc.) to the front gear knob forming surface in the joint surface! 8'', and is mated with a block 21 formed in the same manner except for the winding window processing, and glass welded.Then, the top portion 20 where the gap is exposed is polished to a curved surface, and the slicing line 22 indicated by the dashed dotted line is formed.
A magnetic head is made by slicing along the . In the prior art, when processing the winding window described above, processing was performed using a grinding blade (rotary type) 6 having a boat-shaped cross section as shown in FIG. The processing method is as shown in Figure 3, using jig 7.
A substrate 13, which is a workpiece fixed to a substrate, is cut and ground by a grinding blade 6.

[Problems to be solved by the invention] Boat-shaped wire-wound window 16 of substrate I3 processed by conventional method
The slope 8 is processed by abrasive grains protruding from the slope IO of the boat-shaped grinding blade 6, as shown in FIGS. 4 and 5. After finishing the machining, when looking at the slope 8, there are many linear scratches as shown in FIG. 6, and the surface roughness of the slope 8 is poor.

That is, the surface of the winding window of the substrate 13, which is scraped by the slope lO and bottom surface 9-a of the grindstone 6 as shown in FIG. 4, leaves linear scratches as indicated by 11 in FIG. 6.

This is because the locus of the abrasive grains protruding from the slope lG and the bottom surface 9-a relative to the workpiece becomes a straight line.

Therefore, even if the gap forming surface 18' is finished as a mirror surface, the surface roughness of the slope 8 is poor, so the edge 17 at the boundary with the gap forming surface 18' will not be sharp (if a magnetic head is configured). The optical image seen with a microscope becomes unclear, the end of the gap becomes unclear, and the width of the gap becomes uneven. It will be necessary to repolish the edges 17 to make them sharp.

[Means for Solving the Problems] The present invention provides a method for processing a winding window formed in the vicinity of the lower gap of a magnetic head core according to the claims, by using a side surface of a grinding blade that is inclined with respect to the gap forming surface. It is characterized by the processing of wire-wound windows.

[Operation] The abrasive grains on the side of the grinding blade and 9-b act in a circular manner on the surface of the workpiece, so even if there are large abrasive grains, they will spread evenly over the entire surface of the workpiece. Since the abrasive grains come in contact with the surface, it is difficult to cause large scratches. On the other hand, if similar abrasive grains were present on the slope of the grinding blade and the bottom surface 9-a, the abrasive grains would draw a straight line (
As a result, linear scratches appear. (Refer to Figure 6!!) [Example 1] Figure 1 shows an example of the present invention. Substrate 2 which is a workpiece
is fixed diagonally inside the groove by the jig 3.

When a groove is made in the substrate 2 by the grinding blade (rotary type) 1 in this state, the abrasive grains located on the side surface 5 of the grinding blade cut away the slope 4.
Can be done. At this time, the trajectory of the abrasive grains on the slope 4 is the seventh
The result is a large number of circular arcs 12 as shown in the figure, and no large scratches occur.

In this way, a surface with good surface roughness can be obtained with a -degree machining process.

In other words, the portion scraped off by the side surface 5 of the grinding blade 1 is
Since the abrasive grains coming out from the side surface 5 draw an arc as shown in FIG. 7 on the finished surface of the substrate 2, there are no linear scratches and the roughness is several steps better than the surface processed by the slopes 5a and 5b. The surface is finished. By processing the slope 4 using the side surface of the grinding blade in this manner, it is possible to sharpen the edge 17 at the boundary with the gap forming surface 18° without polishing with a cup-shaped grindstone.

[Effects of the Invention] As explained above, the present invention has the advantage that a slope with good surface roughness can be obtained and the edge of the boundary between the winding window and the gap forming surface can be sharpened without increasing the number of man-hours such as re-polishing. A magnetic head formed by a workpiece processed in this manner has good dimensions and shape near the gap end, and stable magnetic characteristics can be obtained throughout its life.

[Brief explanation of the drawing]

Fig. 1: A cross-sectional view of a grinding blade showing an embodiment of the present invention and a head core during winding window processing Fig. 2: A cross-section of a grinding blade used in the embodiment Figure 3: To explain the machining process of the magnetic head - Perspective view of the magnetic head Figure 4: Cross-sectional view of the grinding blade used in the conventional technology Figure 5: ...Cross-sectional view of the grinding blade and head core illustrating processing using the conventional technology.
Figure 7 is a perspective view of the head core illustrating the scratches that occur on the inner surface of the RAD core winding window. ... Grinding blade, 2 ... Magnetic head core (substrate), 4 ...
・Slope, 5... Side surface, 16... Winding window, 18'... Gap forming surface. Patent applicant Kansai NEC Corporation 111r
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Claims (1)

[Claims] A method for manufacturing a magnetic head, characterized in that the winding window formed in the vicinity of the lower gap of the magnetic head core is machined using a side surface of a grinding blade tilted with respect to the gap forming surface.