JPH04206015A - Manufacture of floating magnetic head - Google Patents

Abstract

PURPOSE:To reduce basic dimensions and diminish even the error of magnetic gap depth, and to prevent an effect on the accuracy of the thickness of an adhesive layer by machining a floatation surface while using an apex section as a reference. CONSTITUTION:The magnetic substance blocks 1 of a blank are divided into ranks by distances among apex sections and front end sections, and a plurality of the magnetic substance blocks 1 at the same rank are fixed to a jig 2 for machining and machined so that top faces are formed in the same planes. Consequently, since the magnetic substance blocks 1 are divided into ranks and the tops faces are arranged and bonded, sections up to floatation surfaces can be machined while using the apex sections as references. Accordingly, basic dimensions are reduced, the error of magnetic gap depth is also diminished, and the dispersion of the thickness of an adhesive layer also has no effect.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of manufacturing a floating magnetic head used in a fixed magnetic disk device.

2. Description of the Related Art In recent years, fixed magnetic disk drives have shown a trend toward smaller sizes and larger capacities, and as recording density has improved, there have been increasing demands for narrower tracks and tighter tolerances in magnetic heads.

In conventional processing processes, in order to regulate the track width and air bearing surface width of a magnetic head, the magnetic head material is first classified into ranks based on the total height of the magnetic blocks, and magnetic blocks of the same rank are placed on the air bearing surface. Glue multiple pieces to a processing jig with the side facing up, then attach the processing jig to a machine tool, repeatedly process the air bearing surface of the glued magnetic blocks, and remove them from the ones that fit within the standard dimension width. , all magnetic blocks are finished with uniform dimensions.

That is, the conventional processing method is described in U.S. Patent No. 3.982.31.
As seen in specification No. 8 and the drawings, the dimension 17 from the reference plane, which is the bottom surface in FIG. Without B), glue the reference surface (bottom surface) to the processing jig,
A processing jig is attached to a processing machine and the magnetic block is processed to obtain a dimension 18 from the reference plane to the total height.

At this time, the difference between the dimensions 18 and 17, that is, the dimension 19 from the apex portion 16 to the tip portion 15, is the magnetic gap depth.

Problems to be Solved by the Invention However, the conventional method described above has a problem with the accuracy of the magnetic gissep depth, as will be explained below.

Of the magnetic gap length and magnetic gear depth, which affect the characteristics of a magnetic head, is it possible to measure the magnetic gap length from the air bearing surface of the magnetic head?
Since it is difficult to measure, in conventional examples, the bottom surface of the magnetic block is used as a reference surface to measure the depth of the magnetic gap and perform subsequent processing. However, there is a variation in the thickness of the adhesive layer that adheres to the processing jig by ±5 μm, and there is also variation in the processing dimensions in the subsequent process, so even if the overall height is precisely processed, the variation of more than ±5 μm will result in a magnetic gap. It occurs at depth.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a method for manufacturing a floating magnetic head in which the magnetic gap depth is constant.

Means for Solving the Problems In order to achieve the above object, the present invention ranks the magnetic blocks of the material according to the distance between the apex part and the tip part described above, and ranks a plurality of magnetic blocks of the same rank. are fixed to a processing jig so that their upper surfaces are flush with each other and processed.

Effects In the present invention, processing is performed up to the air bearing surface with the apex part as a reference, so the basic dimensions are small and the error in the magnetic gap depth is also small. Furthermore, variations in the thickness of the adhesive layer are also irrelevant.

EXAMPLE An example of the manufacturing method of the present invention will be described below with reference to FIGS. 1 to 3. Fig. 1 is a diagram showing an outline of the bonding method of the present invention for adhering a magnetic block of a magnetic head to be processed to a processing jig, Fig. 2 is a diagram showing an outline of processing the magnetic block, and Fig. 3 is a diagram showing an outline of the adhesion method of the present invention for adhering a magnetic block of a magnetic head to be processed to a processing jig. FIG. 2 is a perspective view of a magnetic head processed according to the invention. First, as shown in FIG. 1, a plurality of magnetic blocks 1 of the same rank are temporarily set in a processing jig 2. As shown in FIG. The magnetic blocks 1 are ranked according to the distance 19 from the apex to the tip.

Next, the processing jig 2 in which the magnetic block 1 was temporarily set,
For attachment to the adhesive gap jig 3 using a vacuum chuck 4 or the like, the adhesive gap jig 3 is slid on the adhesive reference base 5 to bring the upper surface of the magnetic block 1 close to the adhesive jig base 6. Thereafter, the magnetic block adsorption jig 8 with the magnet 7 attached is brought closer to the back side of the adhesive jig base 6, and the top surface of the magnetic block 1 is brought into close contact with the adhesive jig base 6 by magnetic attraction. Using the jig 9, force is applied from the side surface of the magnetic block 1 to align the reference side surface of the magnetic block 1 with the side reference portion of the processing jig 2.

At this time, the gap between the magnetic block 1 and the processing jig 2 is filled with adhesive 10, and the magnetic block 1
and the processing jig 2 is permanently fixed.

Reference numeral 11 denotes a gap adjustment jig which defines the total height 22 from the bottom of the processing jig 2 to the top of the magnetic block 1, making it possible to bond the top surfaces of a plurality of magnetic blocks to the same total height.

FIG. 2 is a diagram showing the machining of the magnetic block 1 bonded to the machining jig 2, in which a diamond grindstone 12 is used to perform slope machining. The magnetic blocks are ranked according to dimension 19 in Figure 4, and since the top surfaces are aligned and glued together, the apex portions are also aligned. Therefore, when the top surface is polished, the magnetic gap depth is machined based on the apex portion. It will be the same as being done. Further, since the upper surfaces are aligned, it is easy to process the track width 31 and the air bearing surface width 32 shown in FIG. 3.

Effects of the Invention As is clear from the above explanation, in the present invention, the air bearing surface is machined based on the apex portion, so that the basic dimensions are small and the error in the magnetic gap depth is also small. Furthermore, the thickness of the adhesive layer has no relation to accuracy. Additionally, processes for all high-value ranks of magnetic blocks are eliminated, improving productivity.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining the manufacturing method of the present invention, FIG. 2 is a schematic diagram of processing a magnetic block, FIG. 3 is a perspective view of a magnetic head manufactured by the present invention, and FIG. 4 is a diagram of a conventional magnetic head. FIG. 3 is a diagram for explaining a manufacturing method. 1...Magnetic block, 2...Processing jig, 10...Adhesive. Name of agent: Patent attorney Haruaki Ogata and 2 others, 1.

Claims (1)

[Claims] After filling and bonding multiple magnetic blocks with adhesive between the processing jig and the bottom surface of the magnetic blocks so that the air bearing surfaces with the front gaps are aligned on a constant plane, the processing jig is attached to the processing machine. 1. A method of manufacturing a floating magnetic head, characterized in that the air bearing surface of a magnetic block is processed by attaching the head to a magnetic block.