JPH0661125B2 - Magnetic head manufacturing method - Google Patents

Description

The present invention relates to a method for manufacturing a magnetic head used in a video tape recorder and a magnetic disk, and more particularly to a method for manufacturing a magnetic head having a high precision track width.

[Prior art]

2. Description of the Related Art In recent years, recording media have become smaller and recording has been performed for a long time, and the track width has become finer and denser. The present invention relates to a method of manufacturing a magnetic head made in view of such circumstances.

FIG. 1 shows a completed drawing of a magnetic head. As shown in FIGS. 2a and 2b, a conventional magnetic head processing method is to polish the surfaces of a pair of magnetic blocks 1 and 2 made of a magnetic material to predetermined surfaces. Then, the winding groove 3 is formed on the surface of the one magnetic block 2.

After that, the magnetic blocks 1 and 2 are positioned at a predetermined angle in one direction as shown in FIG. 3 and a groove grinder (a dicing machine, a slicing machine, etc.) is used to cross the magnetic blocks 1 and 2 with a diamond grindstone 4. Track processing is applied to both end surfaces to form track width regulating grooves 5 as shown in FIGS. After confirming several dimensions of the track width 5b shown in FIG. 4 on one of the magnetic blocks 1 and 2, glass 6 is filled in the track width regulating groove 5 of the magnetic blocks 1 and 2.

After that, the gap forming surfaces 7 and 8 of the magnetic blocks 1 and 2 are mirror-finished, and a nonmagnetic layer such as SiO ₂ or A ₂ O ₃ is deposited on the gap forming surface 8 by sputtering or the like to form a gap 9.

Next, as shown in FIG. 5, the magnetic blocks 1 and 2 are butted, and as shown in FIG. 6a, the butted gaps of the effective track width 5a are reduced so as to reduce the butting and press bonding to form the magnetic block body 10. . The gap forming surface 7 of the magnetic block body 10,
8 (tape contact surface) is arc-polished as shown in FIG. 7 to finish the gap depth 11 to a predetermined size. After that, the effective track width 5a portion is cut in the AA direction with a grindstone 4, a wire saw (not shown) or the like to obtain the magnetic head shown in FIG.

[Problems to be solved by the invention]

Although high-precision groove processing machines have been available on the market in recent years, in the conventional method, as shown in FIG. 8, the track deviation 12 varies in the effective track width 5a. As shown in FIG. 3, when the magnetic blocks 1 and 2 are integrated by a method in which the magnetic blocks are positioned in one direction, the beginning and the end of the formation of the track width regulating groove 5 are reversed, as shown in FIG. However, since a difference in the indexing amount with time is generated due to the temperature difference of the groove processing machine, the center portion in the state of the magnetic core block body 10 can reduce the misalignment as shown in FIG. 6a. At both ends of the magnetic core block body 10, there is a problem that a large butt displacement occurs as shown in FIG. 6b, and the effective track width 5a becomes small.

Further, since there is no restriction on the method of introducing the track width regulation groove 5 into the subsequent process, the indexing precision deviations of several groove machining machines are mixed and joined as shown in FIG. , There was a problem similar to the above.

Further, in the effective track width 5a measuring method after the track width regulation groove 5 is formed, the tip portion of the track width 5b is measured as shown in FIG. When the dimension of depth 11 was regulated, the measurement method was such that the increase or decrease in track width 5b corresponding to the angle 13 shown in FIG. 3 was not taken into consideration. Furthermore, since the measured quantity was a quantity that did not take into account variations in the indexing amount of the groove processing machine and wear in the thickness direction of the blade 4 etc., there was a difference between the average value of the effective track width 5a and the standard value. It was

Therefore, an object of the present invention is to solve the above problems and to provide a good quality magnetic head in which variations in the effective track width are reduced.

[Means for solving problems]

In order to solve the above-mentioned conventional drawbacks, the present invention provides a pair of magnetic blocks made of a magnetic material so that each gap forming surface is plane-symmetric with respect to a surface perpendicular to a track width regulation groove processing line. A step of arranging a plurality of pairs, a step of continuously forming track width regulating grooves on the gap forming surfaces of the plurality of pairs of magnetic blocks, a step of forming a winding groove in at least one of the pair of magnetic blocks, and the pair of magnetic blocks By abutting each other with a non-magnetic material, mirror-polishing the medium sliding surface of the block body in which the pair of magnetic blocks are combined and integrated, and cutting the mirror-polished block body to form a magnetic head. It was decided to manufacture.

〔Example〕

 Examples will be described below with reference to the drawings.

FIG. 1 is a completed drawing of the magnetic head, and FIG. 9 is a drawing showing the processing method of the present invention.

As shown in FIGS. 2a and 2b, the magnetic head processing method of the present invention forms a winding groove 3 on the surface of one magnetic block 2 and then forms a pair of magnetic blocks 1 and 2 as shown in FIG. Positioning is performed in an inverted V shape (the gap forming surface is plane-symmetric with respect to a plane perpendicular to the track width regulating groove processing line), and the groove width machine continuously forms the track width regulating groove 5 with the grindstone 4 or the like. .

With this positioning method, the effective track width 5a of the magnetic blocks 1 and 2 begins at the track width 5b of the magnetic block 1, starts at the track width 5b of the magnetic block 2, ends at the track width 5b of the magnetic block 1, and ends at the track width 5b of the magnetic block 2. The end portions are matched with each other in the gap forming process in FIG. 6, and the influence of the time-based index difference due to the temperature difference of the groove processing machine and the wear of the blade 4 in the thickness direction is eliminated.

After the track groove is formed, the effective track width 5a of one of the magnetic blocks 1 and 2 is measured at the track groove measuring position 13 in FIG. By making the track groove measuring position 13 have regularity, the effective track width 5a caused by the inclination 5 of the track width regulation groove 5 is increased or decreased, and the effective track width 5a is increased or decreased by the inclination angle 13 shown in FIG. Can be done. Furthermore, the measurement quantity is the track width regulation groove 5 of the magnetic blocks 1 and 2.
To measure the starting part at several places, the central part at several places, and the ending part at several places, calculate the average value, and make the track width regulation groove 5 a representative value (for one jig) although it was processed at the same time. It is possible to use a representative value that takes into consideration the increase / decrease in the indexing amount of the groove processing machine and the wear of the grindstone 4 in the thickness direction.

Then, as a method of introducing into the subsequent process, one jig for forming the track width regulation groove 5 is sent as one group to the gap forming step of FIG. 5 so as not to be mixed with other groups.
This processing method is not affected by the indexing accuracy error that is unique to the groove processing machine. The magnetic blocks 1 and 2 thus formed are integrated with a non-magnetic material as shown in FIG. 6 as in the conventional manufacturing, and the integrated block body 10 is shown in FIG. A magnetic head is completed by cutting at A-A 'as shown in FIG.

〔effect〕

As described in detail above, in the method of manufacturing a magnetic head according to the present description, a plurality of pairs of magnetic blocks are arranged so that each gap forming surface is plane-symmetric with respect to a plane perpendicular to the track width regulation groove processing line. And the gap forming surfaces 7 and 8
Effective track width 5a caused by machining by continuously forming track width regulation groove on
There is an effect that it is possible to improve the quality of the effective track width 5a by reducing the error in the indexing accuracy of the groove processing machine and the influence on the accuracy of the effective track width 5a by the measuring method after forming the track width regulation groove 5.

[Brief description of drawings]

FIG. 1 is a completed view of a magnetic head, FIGS. 2, 5, and 7 are process drawings of the magnetic head, and FIGS. 4, 6, and 8 are partially enlarged views of FIGS. 2, 5, and 1. FIG. 3 is a schematic view of a conventional track groove processing method, and FIG. 9 is a schematic view of a track groove processing method according to the present invention. 1 ... Magnetic block 2 ... Magnetic block, 2a ... Effective track width 3 ... Winding groove 4 ... Grinding stone 5 ... Track width regulation groove, 5a ... Effective track width 5b ... Track width 6 ... Glass 7,8 ... Gap forming surface 9 ... Gap 10 ... Magnetic block integrated 11 ... Gap depth 12 ... Track deviation 13 ... Angle

Claims (1)

[Claims] 1. A step of arranging a plurality of pairs of magnetic blocks made of a magnetic material such that each gap forming surface is plane-symmetric with respect to a surface perpendicular to a track width regulation groove processing line, A step of continuously forming a track width regulating groove on the gap forming surface of the pair of magnetic blocks; a step of forming a winding groove in at least one of the pair of magnetic blocks; and a pair of magnetic blocks butted with a non-magnetic material. A method of manufacturing a magnetic head comprising a step of bonding, a step of mirror-polishing a medium sliding surface of a block body in which the pair of magnetic blocks are bonded and integrated, and a step of cutting the mirror-polished block body.