JPH01102704A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To manufacture a magnetic head having small track width with high accuracy and superior productivity by forming a core block by jointing a pair of substrates made of ferromagnetic oxide via a gap spacer, forming a first track width regulating groove on the medium confronting planes of the core blocks, and filling a second glass material in the core block. CONSTITUTION:A pair of substrates 11 and 12 are prepared, and plural winding grooves 13 are formed in the entire area of the upper plane 12a of the substrate 12 on one side, and the gap spacer 14 is formed on the upper plane of both or the substrate 11 or 12 on one side, then, the substrates 11 and 12 are butted with each other via the gap spacer 14. And the pair of substrates 11 and 12 can be glass-jointed by heating as pressurizing and welding a glass bar 15, and the core block 16 can be formed by cutting the pair of jointed substrates 11 and 12. Next, plural first track width regulating grooves 19 being intersected orthogonally to the gap spacer 14 are formed on the disk confronting plane 18 of the core block 16. Next, the second glass material 20 for reinforcement is filled in the first track width regulating groove 19. In such a way, it is possible to attach sufficient mechanical strength on a disk confronting part 18a durable for groove working and to prevent a yield from being aggravated.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a method of manufacturing a magnetic head used in an external storage device of an electronic computer or the like.

←) Conventional technology Conventionally, a monolithic magnetic head has been used as a floating magnetic head in an external storage device.On the other hand, as external storage devices become more densely recorded, the track width of the magnetic head is reduced. However, a monolithic magnetic head formed only of Mn--Zn single crystal ferrite has a problem in mechanical strength.

To solve the above problems, for example, tL8P 8P9
A composite magnetic head as disclosed in No. 8899 has been proposed.

As shown in FIG. 12, this composite type magnetic head is opened by joining a head core (1) with a ceramic slider (2) of K glass +31+41f5. The head core (1) is an Mn-type with track width regulating grooves (6) formed therein as shown in FIG.
7. A pair of cores made of single-crystal ferrite (l
a) (lb) are bonded together by reinforcing glass (7). (8) is a magnetic gap having a track width T, and (9) is a winding groove. Further, in FIG. 12, α■ is the magnetic disk contact surface.

To this composite type magnetism, the magnetic gap (8
) is reinforced with glass +31F41 (7), ensuring sufficient mechanical strength of the track section.

However, even in this conventional composite type magnetic head, when forming the track width regulating groove (6) in the core half hole (xa) (1b), the track @ T is 10 to 30 mm.
Because of the small size, the core half-dead (la) (lb) K chipping, etc. occur, resulting in poor yield.

In addition, a track width regulating groove (6) is formed so that the width of the disk-contacting portion of the core half-hole (la) (lb) is slightly thicker than the track width T, and the core half-hole (ta) (t
b) Grind the surface opposite to the track width regulation fi [61].
There is also a method of making the width of the disc contacting portion match the track width T by immersing the disc, but in this case as well,
There are variations in the thickness of the disc contacting portion within one head core file, making it difficult to define the track width with high precision.

(c) Problems to be solved by the invention The present invention has been made in view of the drawbacks of the above-mentioned conventional examples.
It is an object of the present invention to provide a method for manufacturing a magnetic head that can manufacture a flying type magnetic head with a small track width with high precision and high productivity.

B) Means for Solving the Problems The present invention is a method for manufacturing a magnetic head in which a head core made of ferromagnetic oxide is fitted and fixed by a slider, in which a pair of substrates made of ferromagnetic oxide are joined via a gap spacer. forming a first track width regulating groove on the medium contacting surface of the core block and filling the first track width regulating groove with a second glass material; The medium contacting surface of the core block has the first
forming a second track width regulating groove parallel to the track width regulating groove and forming a medium contacting portion having a thickness equal to the track width; a step of forming a head core by slicing the head core into a core storage portion of a slider, and inserting a third glass material having a melting point lower or equal to that of the second glass material into the second track width regulating groove; The method is characterized in that it comprises a step of fixing the head core to the slider for K seconds after filling.

(e) Effect °
- According to the above method, when machining the second track width regulating groove that defines the track width, the medium sliding contact portion is firmly formed by the second glass material filled in the first track width regulating groove. Reinforced.

(F) Embodiments Hereinafter, the method for manufacturing a magnetic head of the present invention will be explained in detail with reference to the drawings.

First, as shown in FIG. 4, a pair of substrates C111L6 made of Mn''-Zn single crystal ferrite is prepared, and the upper surface (lla) of the substrate (1υ 2) is
(12a) and the lower surface (11b') (12b) are mirror-polished, and a plurality of winding grooves αj are formed over the entire upper surface (12a) of one substrate (121).

Next, a gap spacer (14) made of 5in1 or the like is formed on the upper surface of one or both of the substrates 111) (12) by vapor deposition or the like, and the substrate (11) 1z
t-Abut against each other through gap spacer I as shown in FIG. Then, as shown in FIG. 6, the winding a (
Insert the glass rod (1) into 13, and connect the board + 111LD
In this state, by heating while applying pressure from both sides, the glass rod 1151 is melted and the pair of substrates Cl-
11 (13) is glass-bonded. Then, the glass-bonded pair of substrates (1υC13 are connected to the dashed line A- in FIG.
By cutting along λ, a core block shown in FIG. 7 is formed. +171 is the glass rod (151
The lower end of the magnetic gap formed by the gap spacer (141) is reinforced with a first glass material formed by melting the gap spacer (141).

Next, a plurality of first track original regulating grooves j perpendicular to the gap spacer (2) are formed on the disk contacting surface (medium contacting surface) +tS of the core block (toward).

The first truck cap regulating groove 9 has a substantially square cross section, but it may have any other shape such as a rectangular shape, a 7-shape shape, or a shape. Incidentally, if the machining of the first track width regulating groove (19) is performed on a plurality of the core blocks (to), the workability will be improved.

Next, a second reinforcing groove is formed in the first track width regulating groove αl.
The glass material 121 is filled. It should be noted that during this filling process, workability will be improved if a plurality of the core blocks are lined up at the same time. Further, the second glass material (2) is a first glass material (η) that defines the gap depth of the magnetic gap (I).
It has a lower melting point than

Next, the gap depth d of the magnetic gap is defined by grinding and superimposing the disk contacting surface (1 level) of the core block (to) to the broken line B, and then, as shown in FIG. A second track width regulating groove eυ is formed parallel to the first track width regulating groove (11) on the contacting surface α. By machining between the second track width regulating grooves, The thickness of the disk contacting part (medium contacting part) (18a), which is the remaining part, is equal to the track width TK as shown in FIG. ), but any other shape such as a rectangular shape or a 7-shaped shape may be used.

In addition, the second track width regulation) is a slope (21a)
Because of this, the disk contacting portion (18a) has a thick base;
Has sufficient strength. In addition, in order to remove cracks and process-affected layers, the second track/width regulation m (2n is indicated by the broken line C in FIG. It may be formed by stepwise processing to reduce the amount of processing for the track width regulating portion.

When processing the second track width regulating groove CD, since the first track width regulating groove α9 is filled with the second glass material (1), the disk contacting portion (18a)
has sufficient mechanical strength.

Next, the hatched portion (2) in FIG. 11 is cut and removed using a peripheral blade, a wire saw, etc. to form a plurality of head cores (231) shown in FIG.

Next, as shown in FIG. 2, the head core shown in FIG.
A glass rod (c) is placed on the second track width regulating groove t' 211, and then the glass rod is melted by heating to raise the temperature, and as shown in FIG. Fill the glass material □□□ of No. 3 and fix the head core to the slider (2IO).
A material whose melting point is lower than or equal to that of the second glass material (2) is used. There is also a gap. - Finally, a composite magnetic head in which the head core and the slider 24) are integrated is completed by grinding and stacking the head core (to) and the test/7 contact portion (18a) @ of the slider I2a. do.

In the method for manufacturing a magnetic head as described above, when forming the second track width regulating groove (21J in FIG. 1θ to define the track width T of the disk contacting portion (18a)), one end of the magnetic gap I is Since the defined first track width regulating groove (19) is filled with the second glass material (21), the disc contacting portion (18a) has sufficient mechanical strength to withstand the aforementioned groove processing. This prevents deterioration of yield.

(g) Effects of the invention According to the present invention, a track suitable for high-density recording can be obtained.

[Brief explanation of the drawing]

Figures 1 to 11 relate to the present invention, and include Figure 1, Figure 2 of the calyx,
FIG. 3, FIG. 4, FIG. 5, FIG. 6, FIG. 7, FIG. 8, FIG. 9, FIG. 10, and FIG. 11 are diagrams showing a method of manufacturing a magnetic head, respectively. 12 and 13 relate to a conventional example, in which FIG. 12 is a perspective view of a magnetic head, and FIG. 13 is a perspective view of a head core of the magnetic head.

Claims (1)

[Claims] (1) In a method for manufacturing a magnetic head in which a head core made of ferromagnetic oxide is fitted and fixed to a slider, a step of forming a core block by joining a pair of substrates made of ferromagnetic oxide via a gap spacer; forming a first track width regulating groove on the medium contacting surface of the core block and filling the first track width regulating groove with a second glass material; forming a second track width regulating groove parallel to the first track width regulating groove to form a medium contacting portion having a thickness equal to the track width; forming a head core by slicing along the groove, and inserting a third glass material having a melting point lower or equal to that of the second glass material into the second track width regulating groove by fitting the head core into a core storage portion of a slider. A method of manufacturing a magnetic head, comprising the step of fixing the head core to the slider by filling it with a glass material.