JPS61284808A - Working method for magnetic head - Google Patents

Abstract

PURPOSE:To measure easily a gap depth without requiring an X-ray inspection and a destructive inspection, by forming a reference surface for deriving a target gap depth, on the opposite side of a magnetic recording medium. CONSTITUTION:A recording and reproducing gap G1 and an erasing gap G2 are formed to a target value, a recording and reproducing core 4 and an erasing core 5 are joined, and thereafter, a grinding surface, namely, the opposite side of a medium sliding part is brought to facing so as to become a reference of all and it becomes a reference surface W. Next, based on the reference surface W as a reference, sizes T1, T2 to parts 7a, 8a and a size T3 to a grinding surface N for determining a gap depth of the gaps G1, G2 are measured in advance. Slider supporting parts 6, 7 are joined, and thereafter, ground to a shape for obtaining a soft contact to a medium, and a target gap depth is formed. In this case, the size T3 extending from the reference surface W to the grinding surface N is measured, and compared with the sizes T1, T2 which have been measured in advance, by which the gap depth being in the course of working can be known, and target gap depths D1, D2 are measured with high accuracy.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method of processing a magnetic head, particularly to setting a reference surface when polishing the surface facing a magnetic recording medium to obtain a target gap depth. It is.

[Conventional technology]

Figures 2 to 5 are simplified configuration diagrams showing an example of a conventional magnetic head. The recording/reproducing core 4 and the erasing core 5 are integrated. There is a width of 1 between the recording/reproducing core 4 and the central core 2.
1, a gap G1 having a gap depth Dl is formed by interposing the molded glass 3, and a gap G1 having a width I is located between the erasing core 5 and the central core 2 at both ends of the gap G1.
! 2, a gap G2°G2 with a gap depth D2 is formed. An excitation winding 9.10 is wound around each core 4, 5, and a slider support portion 6.7 is provided to sandwich each core 2, 4.5.

In this case, the central core 2 has tapered surfaces 2a formed on both sides of the tip so that it has a tapered shape, and the recording/reproducing core 4 and the erasing core 5
has tapered surfaces 7 and 8, protrudes in the direction of the tapered surfaces 2a and 2a, and is located at the intersection of the extension line of the tapered surfaces 7 and 8 and the perpendicular line. a, 8a determines the gap depth DI, D2.

In the gap G1, information is recorded and reproduced on the recording medium, and in the gap G2. Erasing of both sides of the information track recorded in G2 is performed to prevent information from being mixed up with adjacent tracks.

When processing such a magnetic head, conventionally, in order to obtain the target gap depths DI and D2, the slider support part 6.
7, as shown in FIG. 4.
The surface of the integral part A of No. 5 facing the magnetic recording medium is surfaced to form a reference surface P.

Next, the gap depth Da is determined using the reference plane P as a reference.

Db is measured to determine the machining allowance S. Next, the slider support parts 6 and 7 are joined together, and the reference surface P is polished according to the machining allowance S, and the machining allowance of 8 is removed to complete the magnetic head having the target gap depths DI and D2.

[Problem that the invention seeks to solve]

However, according to the conventional magnetic head processing method, the position of the reference surface P disappears by polishing the reference surface P.
In addition, since the cores 2 and 4.5 are held between the slider support parts 6.7 and the parts 7a and 8a are not visible, it is difficult to accurately determine the gap depth during or after polishing. The drawback was that there was no other way than to conduct a line inspection or a destructive inspection.

Therefore, an object of the present invention is to enable gap depth to be easily measured without requiring X-ray inspection or destructive inspection.

[Means for solving problems]

In the present invention, the surface of each core opposite to the magnetic recording medium is used as a reference surface, and the dimensions from this reference surface to predetermined portions 7a and 8a that determine the gap depth are measured in advance, and then the magnetic field of both cores is measured. The surface on the side of the recording medium is polished, and the target gap depth is obtained by setting the polishing amount based on the relationship between the dimension from the reference surface to this polished surface and the dimension obtained by the measurement above. It is something to do.

[Effect]

If you measure the dimension between the reference surface provided on the opposite side of each core from the magnetic recording medium and the predetermined part that determines the gap depth, you can calculate the above measured value from the dimension from the reference surface to the polished surface. The value obtained by subtracting is the gap depth.

[Embodiments of the invention]

FIG. 1 is a simplified configuration diagram showing one embodiment of the magnetic head processing method according to the present invention, and the same parts as in FIGS. 2 to 5 are denoted by the same reference numerals.

In this case, extensions 4a and 5 provided at the base of both cores 4.5
a is integrated into the central core 2, and its surface, that is, the surface opposite to the surface (polished surface) N facing the magnetic recording medium, is flattened to form a reference surface W.

Next, the processing procedure will be explained. Recording/reproducing gap G1
．． After forming the erasing gap G2 to a target value and joining the recording/reproducing core 4 and the erasing core 5 as shown in FIG. The surface is leveled and used as a reference surface W. Next, using the reference plane W as a reference, the dimensions T'l and T2 to the parts 7a and 8a, which determine the gap depths of the gaps Gl and G2, and the polished surface N
Measure the dimension T3 up to. Slider support part 6゜7
After bonding, the target gap depth is achieved while polishing into a shape that allows flexible contact with the media. At this time, by measuring the dimension T3 from the reference surface W to the polished surface N and comparing it with the previously measured dimensions TI and T2, the gap depth during machining can be known, and the target gap depth can be determined. D.I.

Can produce D2 with high accuracy. That is, from dimension T3 to dimension T
Polishing may be performed so that the value obtained by subtracting I or T2 is set as the target gap depth.

In addition, if there are a large number of objects, it is sufficient to classify them into classes and process them for each class.

[Effects of the Invention] As explained above, according to the present invention, the reference plane for determining the target gap depth is set on the side opposite to the magnetic recording medium, so the dimensions can be measured during polishing or after polishing is completed. The gap depth can be determined simply by using a single magnetic head, making it possible to manufacture magnetic heads with high precision and stable performance.

[Brief explanation of the drawing]

FIG. 1 is a simplified configuration diagram showing an embodiment of the magnetic head processing method according to the present invention, and FIGS. 2 to 5 are cylindrical configuration diagrams showing an example of the conventional magnetic head processing method. 2... Central core, 4... Recording/reproducing core, 5... Erasing core, 6.7... Slider support section, 7a, 8a...
・Part that determines the gap depth, W...Reference surface, N.
...Polished surface. Agent Masu Oiwa A (2 idiots) Sheep 1
figure

Claims (1)

[Claims] In a method of manufacturing a magnetic head consisting of two cores having a gap of a predetermined depth formed on the surface facing the magnetic recording medium in opposing parts, the surface of each core opposite to the magnetic recording medium is A reference plane is used, and the dimensions from this reference plane to a predetermined part that determines the gap depth are measured in advance, and then the magnetic recording medium side surfaces of both cores are polished.
Machining of a magnetic head characterized in that the target gap depth is obtained by setting the polishing amount based on the relationship between the dimension from the reference surface to the polished surface and the dimension obtained by the measurement. Method.