JPH03219406A - Manufacture of magnetic head core - Google Patents

Abstract

PURPOSE:To reduce outward appearance defects and azimuth defects by cutting a wafer into blocks at right angles to a magnetic alloy film, and joining them together in an abutting state and then slicing them at an azimuth angle to the magnetic alloy film formation surface. CONSTITUTION:The magnetic head wafer 4 is formed by sticking and laminating a thin film 4b of a material with high saturation magnetic flux density such as 'Sendust(R)' on a nonmagnetic substrate 4a by sputtering to thickness equal to track width size. For the manufacture of a magnetic head, the magnetic wafer 4 as a core block blank material is stuck on the reference surface 3 of a slice jig 2 which is formed previously at right angles to the reference surface 5 of a jig main body 1 and the slice jig 2 is stuck abutting on the reference surface 5 of the jig main body 1. Then the wafer is cut with a wafer cutting grindstone 6 into the core blocks A8 and A7. Then a core block 17 in an abutting state is obtained after glass molding, wiring window machining, specular surface polishing, gap formation, abutting, welding, etc. This block 17 is stuck on the reference surface 10 of the slice jig 9 with an azimuth angle 15 and cut with a core block cutting grindstone 11 to obtain a core chip 12.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) The present invention relates to a method for manufacturing a narrow track magnetic head core using a laminated core, and particularly to simplifying the processing process and improving the accuracy of the azimuth angle when manufacturing the core chip.

Narrow track magnetic heads, which have recently begun to be adopted in HDTVs and other devices and have become capable of high-density recording, have a core formed by a Sendust thin film, a high saturation magnetic flux density material, on a non-magnetic substrate. It is made using a core block obtained by laminating the core blocks that are adhered and formed.

Conventionally, as shown in FIG. 5, the conventional method for processing this type of core block is to attach a magnetic held wafer 4 to a plate 14 at an azimuth angle of 15, and then use a grindstone 6 for cutting the wafer.
Alternatively, as shown in FIG. 6, the wafer is pasted on a slicing jig 9 with an azimuth angle and cut with a wafer cutting grindstone 6 to obtain a block. After forming a gap in the block and butt welding, the cylinder 7
A core block 16 with matched azimuth angles as shown in the figure is obtained. The butted core block 16 with the azimuth angle is again angled at the azimuth angle 15 and attached to the plate 14, and then cut with a core block cutting grindstone II, or the azimuth angle is set as shown in Fig. 7. In addition, the core chips were attached to a slicing jig 9 with an azimuth angle and cut with a core block cutting grindstone 11 to obtain core chips.

However, in the above method, the azimuth angle adjustment is
In addition to requiring man-hours to perform the adjustment twice, as shown in Figure 8, due to the accumulation of azimuth deviations 13 that occur during the first and second azimuth adjustments, a large deviation from the original azimuth angle standard occurs, resulting in poor appearance. Therefore, there was a problem that the yield decreased.

° In order to solve the above problem, this invention has changed from the conventional method of adjusting the azimuth twice to using a jig with a right angle protruding in advance, without setting the azimuth angle, when cutting out the core block in the wafer state. The core block is made by cutting the wafer at right angles to the magnetic alloy film, and after butt joining, the wafer is sliced at an azimuth angle to the surface on which the magnetic alloy film is formed.

Production I - By the above method, the azimuth angle can be ignored when cutting the block from the wafer state, which is the raw material for the core block, and the azimuth angle is determined only during core chip slicing, so appearance defects and azimuth defects can be thoroughly reduced. be able to.

L Direction 1 FIGS. 1 to 4 show an embodiment of the magnetic head manufacturing method of the present invention. An embodiment of the present invention will be described below with reference to the drawings. First of all, the magnetic helad wafer 4 is made by laminating a thin film 4b of a high saturation magnetic flux density material such as Sendust with a thickness equal to the track width on a non-magnetic substrate 4a by sputtering, as in the conventional case. It was formed. Therefore, in order to manufacture a magnetic head, a magnetic held wafer 4, which is a core block raw material, is attached in advance to the reference surface 3 of the slicing jig 2, which is perpendicular to the reference surface 5 of the jig body 1, and the slicing jig is The tool 2 is further placed against the reference surface 5 of the jig main body 1 and pasted. After that, the core block A shown in FIG. 2 is cut with a wafer cutting grindstone 6.
8 and Core Pro Tsuk B7. Thereafter, as shown in FIG. 3, after glass molding, winding window processing, mirror polishing, gap formation, butting, and welding are completed, a butted core block 17 is obtained. This butted core block 17 is attached to the reference surface lO of the slicing jig 9 with an azimuth angle 15 and cut by a core block cutting grindstone 11 to obtain a core chip 12.

As explained above, in the present invention, the core block cutting operation in the wa/% state is performed by cutting at right angles to the magnetic alloy film without making an azimuth angle, and by adding an azimuth angle when slicing the core block. Compared to the conventional method of adjusting azimuth twice, appearance defects and azimuth defects are reduced.
Furthermore, it has the excellent effect of reducing manufacturing man-hours.

[Brief explanation of drawings]

1, 2, and 3 are perspective views of a core block and a cutting jig showing an embodiment of the magnetic head manufacturing method of the present invention. FIG. 4 is a perspective view of the completed core chip. 5 and 6 are perspective views of a core block and a jig showing a conventional manufacturing method. FIG. 7 is a perspective view of a conventional defective core chip. 1...Jig main body, 2...Slice jig, 3...Slice jig reference surface, 4...Magnetic rad wafer, 4a... ...Nonmagnetic substrate, 4b...Magnetic alloy film, 5...Jig body reference surface, 6...Wheelstone for cutting wafer, 7...・Core block B1 8...Core block A1 9...Slice jig with azimuth angle, IO...
...Slice jig reference plane with azimuth angle, 11...
... Grindstone for cutting core block, 5-6-l2 ... Core chip, 13 ... Azimuth deviation angle, 14 ... Paste on board, 15 ... ...Azimuth angle, 16...Butted core block, 16...
...Butted core block with azimuth, 17
...Butted core lock. 7- Procedural amendment (method) April 11, 1991 1. Indication of the case 1999 Patent Application No. 25Et479 2. Title of invention Method for manufacturing magnetic head core 3. Person making the amendment Related to the case Patent application Kansai NEC Co., Ltd. 5, 2-9-1 Seiran, Otsu City, Shiga Prefecture 520, "Brief Description of Drawings" column of the application specification to be amended. 6. Contents of the amendment In the 7th line of page 6 of the application specification, "A perspective view of..." has been changed to "A perspective view of... Figure 8 is a conventional defective core chip. This is an enlarged perspective view of the main parts of the

Claims (1)

[Claims] A wafer obtained by laminating a magnetic alloy film on a non-magnetic substrate is cut to make a core block, the core blocks are butted and bonded, and then sliced into individual pieces. A method of manufacturing a magnetic head core used as a core chip is characterized in that the wafer is cut at right angles to the magnetic alloy film to form a core block, and after butt-bonding, the wafer is sliced at an azimuthal angle to the surface on which the magnetic alloy film is formed. A method for manufacturing a magnetic head core.