JPH02260206A - Production of composite type hdd magnetic head - Google Patents

Abstract

PURPOSE:To attain accurate gap depth adjustment and to obtain a magnetic head with high quality and high reliability by setting up the height of a core chip to a value larger than that of a slider and setting up the reference of gap depth work to the bottom of the chip. CONSTITUTION:The height (c), (h) of the core chip 2 is formed so as to be higher than the height (s), (h) of the slider 1 and the core chip 2 and the slider 1 are unitedly joined with a non-magnetic bonding agent, e.g. glass, so that the gap forming upper face 2g of the core chip 2 coincides with the upper face 1a of the slider 1. In the united magnetic head, the gap forming face 2g and the upper face 1a are lapped by using the bottom 4 of the core chip 2 as the reference so that the gap depth (g.d.) has a prescribed depth. Thereby, the reference face of the gap depth (g), (d) is changed from the bottom 4 to the bottom 3 of the slider 1 and the bottom 3 is not stuck to the lap face, so that highly accurate gap depth work can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION Sho 1L Hi's L1 field - This invention is particularly useful for magnetic heads used in HDDs (Hard Disk Drives), which are external storage devices for computers. Composite HDD that is fitted into a slider and integrated into one
The present invention relates to a method of manufacturing a magnetic head for use in the present invention.

In recent years, with the increase in the recording density of magnetic recording media such as magnetic disks in this type of storage device, high-performance magnetic heads have been used to record information on the magnetic media and reproduce information from the magnetic recording media. HDD that realizes density magnetic recording
A composite magnetic head is used. This H
A specific example of a composite magnetic head for DD is shown in FIG. 4 and will be described. In FIG. 4, reference numeral 2 denotes a bulk type core chip in which a pair of cores are bonded together with a non-magnetic adhesive such as glass to form a magnetic gap 13 having a predetermined track width Lw. 1 is a slider made of non-magnetic material,
For example, materials such as CaTlO3 and BaTlO3 are used.

The bulk core chip 2 and the slider 1 are made of non-magnetic adhesive material,
For example, the glass 12 is integrally bonded.

Further, the core chip 2 is wound with a predetermined number of turns of an insulating coated wire 6.

Next, a conventional example of the manufacturing method of the above magnetic head is shown in FIG.
The explanation will be based on e. First, as shown in Figure 5a,
A pair of long rectangular parallelepiped core blocks 2a and 2b are prepared. Core block 2a + 2b is made of ferrite,
Sendust or a composite of these materials. A concave groove 7 that will serve as a winding insertion hole is cut on the inner surface of the core block 2b. The grooves of the core blocks 2a, 2b and the upper part of the groove 7 are filled and molded with low melting point glasses 14a, 14b, 15, respectively, and the inner surfaces that will be the joint surfaces of both core blocks 2a+2b are mirror-finished to form the joint surfaces. A non-magnetic thin film such as 5IO3 is deposited near the top (not shown).

After that, as shown in FIG. 5, both core blocks 2a12b
The molded glass 15. 14a and 14b are melted to join and integrate both core blocks 2as2b.

Then, both core blocks 2at 2 joined and integrated as described above
The core chip 2 shown in FIG. 5C is obtained by slicing b into predetermined thickness sections in the transverse direction as shown by broken lines. This core chip 2 is grooved in the upper part of the core chip with a blade so as to have a track width Lw as shown in FIG. 5d. This core chip 2 is fitted into the slider 1 with a notch K, and while being molded with low melting point glass 12, the core chip 2 is
and slider 1 are heated and joined together.

The top end 16 of this integrated core is mirror-wrapped to a predetermined gap depth, and then winding is performed to obtain a magnetic head as shown in FIG. 4.

Incidentally, in the method for manufacturing the magnetic head described above, the gap depth is controlled by mirror-lapping the core chip 2 together with the slider 1. However, since the core chip 2 is fitted into the slider 1, the core side surface 2c for reading the gap depth is hidden by the slider 1 and cannot be optically read. Conventionally, the bottom surface of the core block 2 was ground to a predetermined dimension from the zero gear depth, and the gap depth was read using the bottom surface of the core block as a reference. However, when the core chip 2 and the slider 1 are integrated, the bottom surface of the core chip 2 and the bottom surface of the slider 1 are aligned and glass welded, so the gap depth reference is shifted to the bottom surface of the slider. However, when the core chip 2 and the slider 1 are integrated, the bottom surfaces of each are slightly misaligned and welded together, making it impossible to accurately control the gap depth and degrading the quality of the magnetic head.
There were problems such as lack of reliability.

1. - This invention has been proposed in view of the above problems, and is a method of manufacturing a magnetic head for a composite HDD in which a core chip is fitted into a slider with a notch and joined together, the core chip Set the height of the slider to be higher than the height of the slider.
The gap depth is adjusted by grinding the top surfaces of the core chip and the slider based on the bottom surface of the core chip that protrudes from the bottom surface of the slider after fitting.

Work 1 - According to the above technical means, the reference plane of the gap depth is
Since there is no change from the bottom of the core chip to the bottom of the slider, it is possible to accurately set the gap depth to a predetermined depth.

One embodiment of the method for manufacturing a composite type HDD magnetic head according to the present invention will be described with reference to FIGS. 1 to 3. The feature of this invention is that the chip height C1h of the core chip 2 is made larger than the slider height 81h,
By using the chip bottom surface 4 as a reference in gap depth processing, the gap depths g and d can be set to predetermined depths.

That is, the heights c and h of the core chip 2 are the slider S.

h, and when integrating the slider 1 and the core chip 2, they are bonded and integrated using a non-magnetic adhesive such as glass so that the gap-forming upper surface 2g of the core chip 2 and the upper surface 1a of the slider 1 match. . Gap depth processing is performed on the integrated magnetic head with the core chip bottom surface 4 as a reference.

In this process, for example, as shown in FIG. 3, the core chip bottom surface 4 of the integrated magnetic head is
is pasted with wax 10 or the like, and the gap forming surface 2g and the slider top surface 1a are lapped so that the gap depths g and d become predetermined depths based on the bottom surface 4 of the core chip.

In this way, the reference surface for the gap depths g and d changes from the core chip bottom surface 4 to the slider bottom surface 3, and the slider bottom surface 3 is not stuck to the lap surface plate 9, so that accurate gap depth machining is possible. It is possible. After winding the magnetic head described above, a composite HDD is manufactured.
Obtain a magnetic head.

Mitsuho! According to this invention, the height of the core chip is made higher than the height of the slider, the core chip is integrated, and the gap forming surface of the core chip and the top surface of the slider are polished based on the bottom surface of the core chip to perform gap depth processing. Therefore, it is possible to accurately adjust the gap depth and provide a high quality and highly reliable magnetic head.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a magnetic head according to the present invention, FIG. 2 is a front view, and FIG. 3 is a sectional view showing a method of manufacturing a magnetic head according to the method of the present invention. FIG. 4 is a perspective view showing a conventional example of a composite type HDD magnetic head, and FIGS. 5a to 5e are perspective views showing a conventional method of manufacturing the magnetic head. DESCRIPTION OF SYMBOLS 1...Slider, 1a...Slider top surface, 2...Core chip, 2g...Gap formation top surface of core chip, 3...Slider bottom surface, 4...Core chip bottom surface. i3FIA Drawing Cleaning Figure 5 Procedural Amendment (Method) % Formula % Name of Invention Method of Manufacturing Magnetic Head for Composite HDD 3゜Relationship with Person Making Amendment Case Patent Applicant 2-chome Seiran, Otsu City, Shiga Prefecture, 520 No. 9-1 Kansai NEC Co., Ltd. Contents of the 6° amendment to the drawing attached to the specification subject to the 5° amendment

Claims (1)

[Claims] A method of manufacturing a magnetic head for a composite HDD in which a core chip is fitted into a slider with a notch and joined together, the height of the core chip being made higher than the height of the slider from the bottom of the slider, and the bottom of the core chip protruding after fitting. 1. A method of manufacturing a magnetic head for a composite HDD, which comprises adjusting the gap depth by grinding the upper surface of a core chip and a slider based on the above.