JPS62189608A - Production of magnetic head - Google Patents

Abstract

PURPOSE:To reduce the variance of the effective track width by setting a pair of magnetic blocks so that the gap forming faces of both blocks are linearly symmetrical with each other and forming continuously the track width control grooves on those gap forming faces of the blocks. CONSTITUTION:A pair of magnetic blocks 1 and 2 are set so that their gap forming faces 7 and 8 are linearly symmetrical with each other. Then the track width control grooves are formed continuously on the faces 7 and 8 respectively. Then both blocks 1 and 2 are put together and unified by means of a nonmagnetic material and then cut after the medium rubbing surface of the unified block matter is polished into a mirror surface. In such a way, the variance 12 produced at the abutting part of the effective track width 5a by processing can be reduced together with the calculation accuracy error proper to a groove processing machine and the effect given to the accuracy of the width 5a caused by the measurement carried out after formation of the track width control grooves 5. In such a way the formation quality of the width 5a is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing magnetic heads used in video tape recorders and magnetic disks, and particularly relates to a method for manufacturing a magnetic head having a highly accurate drift width. It is something.

[Prior art]

In recent years, recording media have become smaller and have longer recording times, and track widths are becoming smaller and higher densities are becoming more common. The present invention was developed in view of these circumstances.

□ Concerning the manufacturing method of de.

Figure 1 shows a completed diagram of a magnetic head.The conventional magnetic head processing method is as shown in Figures 2a and b, in which the surfaces of a pair of magnetic blocks 1.2 made of magnetic material are aligned with predetermined planes. Then, winding grooves 3 are formed on the surface of one magnetic block 2.

Thereafter, each magnetic block 1.2 is positioned at a predetermined angle in one direction as shown in FIG. Track processing is performed on both orthogonal end surfaces to form track width regulating grooves 5 as shown in FIGS. 2a and 2b. Then magnetic brovk 1
．． After checking the dimension of the groove width 5b at several locations on one of the magnetic blocks 1 and 2 as shown in FIG. 4, glass 6 is filled into the track width regulating groove 5 of the magnetic blocks 1 and 2.

Thereafter, the gap forming surface 7°8 of the magnetic block 1.2 is mirror-finished to give the gap forming surface 8 SK%.

) A nonmagnetic layer such as J203 is deposited, sputtered, etc. to form the gap 9.

Next, as shown in FIG. 5, the magnetic blocks 1 and 2 are butted together, and as shown in FIG.
form 0. The gap forming surfaces 8 and 9 (tape abutting surfaces) of the magnetic block body 10 are polished in a circular arc as shown in FIG. 7 to finish the gear blade depth 11 to a predetermined dimension. Thereafter, 5 portions of the effective track width of 5a were cut in the A-A direction using a grindstone 4, a wire saw (not shown), etc., and the magnetic material was prepared as shown in FIG.

can be obtained.

[Problems to be Solved by the Invention] Although high-precision groove processing machines have been on the market in recent years, the conventional method causes variations in the effective track width 5a and the truncated deviation 12, as shown in FIG. was occurring. Third
As shown in the figure, when the magnetic blocks 1 and 2 are integrated using the method in which the magnetic blocks are positioned in one direction, the beginning and end portions of the track width regulating groove 5 are reversed, and they are joined as shown in Figure 5. Therefore, there is a temporal indexing amount difference caused by the temperature difference of the groove processing machine, and in the state of the magnetic core block body 10, the central part can be aligned with less misalignment as shown in FIG. 6a, but the magnetic core Figure 6 C at both ends of the block body 10 meters
There is a problem in that a large misalignment occurs as shown in the figure, and the effective track width 5a becomes smaller.

Furthermore, there is no regularity in the method of inputting into the post-process after forming the track width regulating groove 5, and the indexing accuracy deviations unique to several groove processing machines are mixed and joined as shown in Figure 5. , had the same problem as above.

In addition, in the method of measuring the effective top width 5a after forming the track width regulating groove 5, the tip of the track width 5b was measured as shown in FIG.
This measurement method does not take into account the increase or decrease in track radius 5b corresponding to the angle 13 shown in FIG. 3 when the depth 11 dimension shown in FIG. 7 is regulated. Furthermore, the measured quantity did not take into account the variation in the indexing amount of the groove processing machine and the wear in the thickness direction of the blade 4, so there was a difference between the average value of the effective track width 5a and the standard value. occurred.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a high-quality magnetic head that reduces variations in effective track width.

[Means to solve the problem]

In order to solve the above-mentioned conventional drawbacks, the present invention provides a process of arranging a pair of magnetic blocks made of magnetic material so that their respective gap forming surfaces are line symmetrical, and forming gears and pins of the pair of blocks. a step of forming a continuous track width regulating groove on a surface, a step of forming a winding groove in one of the magnetic blocks, a step of abutting the pair of magnetic blocks and bonding them non-magnetically, and bonding the magnetic plotter. a step of mirror-polishing the media sliding surface of the integrated broken body;
A magnetic head was manufactured by cutting this mirror-polished block.

〔Example〕

Examples will be described below using figures.

FIG. 1 is a completed diagram of the magnetic head, and FIGS. 2 to 9 are diagrams showing the processing steps.

The method of processing a magnetic held according to the present invention involves forming a winding groove 3 on the surface of one magnetic block 2 as shown in FIGS. 2a and 2b, and then forming a pair of magnetic blocks 1. 2 is positioned in an inverted V shape (the gear and gear forming surfaces are axisymmetric), and track width regulating grooves 5 are continuously formed using a grindstone 4 or the like in a groove processing machine.

With this positioning method, the effective track width 5a of the magnetic blocks 1 and 2 is the same as the beginning of the track width 5b of magnetic block 1, the beginning of track width 5b of magnetic block 2, and the beginning of track width 5b of magnetic block 1.
At the end of the track width 5b of the magnetic plotter 2, the ends of the track width 5b are brought together in the groove forming process shown in FIG. The effect of wear is eliminated.

After forming the track groove, move one of the magnetic blocks 1.2 to the effective track width 5 at the track groove measurement position 13 in Figure 4.
Measure a. By providing regularity to this track groove measurement position 13, measurement takes into account an increase or decrease in the effective track width 5a caused by the inclination 5 of the track width regulating groove 5, and an increase or decrease in the effective track width 5a corresponding to the inclination angle 13 in Fig. 3. I can do it. Furthermore, the measurement quantity is measured at several locations at the beginning, at several locations at the center, and at several locations at the end of the track width regulating groove 5 of the magnetic blocks 1 and 2, and the average value is calculated. Since this is a representative value for simultaneous machining (for one jig), it is possible to take into account the increase/decrease in the allocated amount for each groove machining machine and the wear of the grinding wheel 4 in the thickness direction.

The method of inputting to the subsequent process is to send one set of groove width regulating groove 5 forming jigs as one group to the gap forming step shown in FIG. 5 so as not to mix with other groups.

This machining method is not affected by indexing accuracy errors inherent in groove machining machines. The magnetic blocks 1 and 2 thus formed are integrated with a non-magnetic material as shown in FIG. 6 in the same manner as in conventional manufacturing, and the integrated block body 10 is shown in FIG. (The magnetic helad is completed by cutting along A-A'.

〔effect〕

As described above in detail, in the method for manufacturing a magnetic head according to the present description, the gap forming surfaces 7 and 8 of the pair of magnetic prolifera 1 and 2 are arranged in a line-symmetrical manner, and the gap forming surfaces 7 and 8 are continuous with each other. The deviation 12 of the mating portion of the effective track width 5a caused by forming the track width regulating groove 5, the indexing accuracy error unique to the groove processing machine, and the effective track width due to the measurement method after forming the track width regulating groove 5. There is an effect that the quality of the effective track width 5a can be improved by reducing the influence on the accuracy of the track width 5a.

[Brief explanation of drawings]

Figure 1 is a completed diagram of the magnetic head, Figures 2, 5, and 7 are machining process diagrams of the magnetic head, and Figures 4, 6, and 8 are the parts of Figures 2, 5, and 1. An enlarged view, FIG. 3 is a conventional track groove machining method, and FIG. 9 is a schematic diagram of a track groove machining method according to the present invention. 1...Magnetic block 2...Magnetic block 2a・Effective track width 3・
Winding groove 4, grinding wheel 5...Track width regulating groove 5a...Effective trap width 5b...Track width 6...Glass 7.8...Gap forming surface 9, gear, block 10, magnetic block integrated 11... Gap depth 3 12... Track deviation 13... Angle Figure 1 Figure 2 Figure 3 Section 4

Claims (1)

[Claims] A step of arranging a pair of magnetic blocks made of a magnetic material so that their respective gap forming surfaces are line symmetrical, and forming track width regulating grooves continuously on the gap forming surfaces of the pair of blocks. a step of forming a winding groove in one of the magnetic blocks; a step of abutting the pair of magnetic blocks and combining them with a non-magnetic material; A method for manufacturing a magnetic head comprising the steps of mirror polishing and cutting the mirror polished block body.