JPH03212810A - Magnetic head - Google Patents

Abstract

PURPOSE:To allow the easy and good welding operation of a core chip to a slider by forming projecting parts on the side faces of a core chip holding hole and inserting the core chip into the space enclosed by the front end faces of the projecting parts. CONSTITUTION:The core chip 10 is inserted into the core chip holding hole 22 and is fixed and mounted to the slider by a welding material. The projecting parts 26, 28 are formed on both side faces on the long side of the core chip holding hole 22 and the projecting parts 30, 32 are formed on both side faces on the short side. The core chip 10 is inserted into the space enclosed by the front end faces of the projecting parts. A clearance larger than the height of the projecting parts is, therefore, assured between the front end faces and the core chip 10, by which the uniform inflow rate of the welding material is assured. The easy welding operation is thus carried out under specified welding conditions.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a magnetic head used in a magnetic recording device such as a floppy disk drive or a node disk drive for recording, reproducing, or erasing information. It is.

[Prior Art] FIG. 3 is an exploded perspective view showing the main structure of a conventional magnetic head, in which a core chip 10 and a slider piece (small) 12 and a slider piece (large) 14 that sandwich the core chip 10 from both sides are shown. It is organized as a department.

The core chip 10 is made of ferrite and has a recording/reproducing gap 16 and an erasing gear knob 18 formed thereon.

On the other hand, a slider 2 consisting of slider pieces 12 and 14
0 is made of calcium titanate ceramics.

Then, slider pieces 12 are attached to both sides of the core chip 10.
A magnetic head is constructed by bonding 14 and 14 with an organic adhesive or inorganic glass.

FIG. 4 shows a perspective view of the magnetic head thus formed.

In such a conventional magnetic head, since the slider 20 is composed of two parts, the slider pieces 12 and 14, it is necessary to process each part, and the work of sandwiching the core chip 10 between the slider pieces 12 and 14 is required. That is, a series of operations are required before bonding, such as polishing the bonding surfaces of the core chip 10 and both slider pieces 12 and 14, which has the drawback of increasing costs as a whole.

Therefore, in order to compensate for these drawbacks, a magnetic head in which a slider as shown in FIG. 5 is integrally formed has been developed (Japanese Unexamined Patent Publication No. 62-217413, FIG. 1, etc.).

FIG. 5(A) shows an integrally molded slider 20, and a core chip holding hole 22 is formed in the upper surface 20a of the slider 20. This core chip holding hole 22
is formed in a rectangular shape corresponding to the shape of the core chip 10, and penetrates downward from the upper surface of the slider 20.

Then, the core chip 10 shown in FIG. 5(B) is inserted into this core chip holding hole 22 from the leg portion 11 side. Then, it is fixed to the slider 20 with an inorganic glass rod 24 as a welding agent shown in FIG. That is, the inorganic glass rod 24 is melted and flowed into the gap between the outer surface of the core chip 10 inserted into the core chip holding hole 22 and the inner surface of the core chip holding hole 22, so that the two are welded together.

[Problems to be Solved by the Invention] However, according to the configuration of the conventional magnetic head described above,
Although welding work is required to attach the core chip 10 to the slider 20 as described above,
As shown in the figures B) and (C), the relative positional relationship between the core chip 10 and the core chip holding hole 22 varies.

For example, the figure (A) shows the case when the core chip 10 is closer to one of the short sides of the core chip holding hole 22, the figure (CB) shows the case when the core chip 10 approaches the longer side of the core chip holding hole 22, and the figure (CB) shows the case when the core chip 10 approaches the long side of the core chip holding hole 22.
) respectively show the case where the core chip 10 is inserted into the core chip holding hole 22 in an inclined state.

As described above, it is difficult to maintain an even clearance between the core chip 10 and the core chip holding hole 22 by simply inserting the core chip 10 into the core chip holding hole 22. When the core chip 10 is inserted unevenly, specifically, the part with the small clearance is about 1 μm, and the part with the large clearance is about 20 to 30 μm. When performing welding work in such a state, in order to melt and flow the inorganic glass rod 24 well in the part where the clearance is small, the work must be performed at a higher temperature and for a longer time than in the part where the clearance is large.

Figure 7 shows a graph regarding the inflow velocity of such glass into the clearance, where the welding temperature and glass material are constant, the inflow velocity v is plotted on the vertical axis, and the clearance d is plotted on the horizontal axis. ing. As can be understood from this graph, the smaller the clearance, the slower the glass inflow speed.

Therefore, if welding conditions such as temperature and time are adjusted to correspond to a portion with a small clearance, the inorganic glass rod 24 will flow out to an unnecessary portion in a portion with a large clearance, causing a problem.

In addition, when the welding conditions are adapted to areas with large clearance, the compatible glass rod 2
4 did not flow in sufficiently, resulting in insufficient glass filling, resulting in incomplete welding.

As described above, even when the slider is configured as an integrated type, there is a problem in that the installation of the core chip involves work that is difficult to perform accurately.

Purpose of the Invention The present invention has been made to solve the above-mentioned problems, and its purpose is to reduce the cost of the slider by using an integrated slider, and to attach the core chip to the slider by welding. It is an object of the present invention to provide a magnetic head that can be easily and efficiently operated.

[Means for Solving the Problems] In order to achieve the above object, a magnetic head according to the present invention includes a core chip having a recording/reproducing and/or erasing gap, and a core chip having a rectangular hole for holding the core chip. an integrally molded slider having a holding hole; the magnetic head is constructed by inserting the core chip into the core chip holding hole and fixing it to the slider with a welding agent; At least two convex portions are formed on both side surfaces of the side, and at least one convex portion is formed on both side surfaces of the short side,
It is characterized in that the core chip is inserted into a space surrounded by the tip surfaces of all the convex portions.

[Operation] According to the above configuration, the core chip is inserted into the space surrounded by the tip surfaces of the plurality of convex portions formed on each inner side of the core chip holding hole. Therefore, even if there is a difference in the clearance between each distal end surface and the core chip, the portion of the inner surface of the core chip holding hole where no convex portion is formed (the area that occupies most of the inner surface) is at least convex. A clearance greater than the height of the part can be secured, and a substantially uniform inflow speed of the welding material can be secured.

Then, the welding material filled in the large clearance parts other than the protrusions flows into the gap between the tip surface of each convex part and the core chip from both sides, and it is also effective to prevent the occurrence of insufficient glass filling in those parts. is prevented.

As described above, according to the present invention, welding work can be easily performed under certain welding conditions, and manufacturing can be facilitated.

[Embodiments] Hereinafter, preferred embodiments of the magnetic head of the present invention will be described based on the drawings.

FIG. 1 shows a perspective view of the slider and core chip of the embodiment. The slider 20 is integrally formed, and a core chip holding hole 22, which is a characteristic component of the present invention, is formed in the upper surface 20a of the slider 20. . This core chip holding hole 2
2, the core chip 10 is inserted and attached from above as in the conventional case.

The present invention is characterized by the shape of the core chip holding hole 22, and in this embodiment, two protrusions 26a are provided on each of the two long sides of the rectangular core chip holding hole 22.
, 26b and 28a, 28b are provided. One convex portion 30 and one convex portion 32 are formed on each of the short side surfaces. And each convex part 26a, 26b, 28
The core chip 10 is inserted inside the distal end surfaces of the as 28b, 30, and 32.

FIG. 2 is an imaginary diagram showing a state in which the core chip 10 is inserted into such a core chip holding hole 22, and shows that the core chip 10 is surrounded from all sides by the tip of each convex portion.

According to this embodiment, the distance from the tip surface of each convex portion 26, 28, 30 and 32 to the outer surface of the core chip 10, that is, the clearance between them, is determined by the deviation in either direction as in the conventional case. The clearance will vary in size.

However, in most areas other than each convex part within the core chip holding hole 22, a substantially constant clearance (above the height h of the convex part) is obtained. Therefore, in most areas where this clearance is constant, as can be understood from the graph in FIG.
This makes it possible to obtain a substantially constant inflow velocity as a whole even if there is a difference in clearance at the tip end surface of each convex portion. Furthermore, at the tip of each convex portion, the glass flows not only from above but also from both sides of the convex portion as indicated by the arrows in Fig. 2, so it is possible to effectively prevent the occurrence of insufficient glass filling. .

Therefore, even if welding conditions are set according to areas with large clearances and welding is performed under those constant conditions, it is possible to obtain a nearly uniform inflow of glass. Welding work can be easily performed without causing any shortages.

Furthermore, since the core chip 10 is held in the core chip holding hole 22 by the tip surface of each convex part, even if there are some protrusions or curves on the surfaces other than the convex parts, the installation of the core chip 10 will not be affected to the same extent. .

Therefore, in manufacturing the slider 20, the core chip 22
The inside can be manufactured relatively roughly, making manufacturing and dimensional control easier. In particular, since it is permissible to round the four corners of the core chip holding hole 22, it is possible to eliminate the occurrence of harmful hair cracks during the molding, firing, and welding processes, which has the advantage of improving yield. It also has

In this embodiment, two protrusions 26 and 28 are formed on each of the long sides and one protrusion 30, 32 is formed on each of the short sides in the core chip holding hole 22, but it is possible to increase the number of these protrusions. It is also possible to adjust the height h of the protrusion in various ways as long as a substantially uniform glass inflow effect can be obtained. Specifically, the clearance between the core chip 10 and the core chip holding hole 22 is usually 10 μm or more, taking into consideration the mechanical strength of the slider 20 as a single item and the time required for the glass to flow into the clearance.
It is set within a range of 00 μm or less, and the recess height h
must necessarily be 10 μm or more and 100 μm or less. However, the inorganic glass rod 24 used as a welding agent contains an alkali metal oxide (Na20, K2O, etc.) in order to match the expansion coefficient with the core chip 10 and the slider 20; Since it is impossible to match the coefficients exactly, in order to reduce the residual gold after welding and maintain the performance as a magnetic head, the height h of about 10 μm to 30 μm is required to minimize the volume of the glass inlet. It is preferable that

Next, regarding the width W of each convex portion, it is desirable to form it as small as possible in order to prevent the occurrence of insufficient glass filling. However, the thickness is designed to be approximately 50 μm in consideration of the difficulty in machining the molding die for molding the slider 20 and the possibility that the protrusions may be chipped when inserting the core chip 10.

Note that the magnetic head of the present invention can be effectively applied not only to floppy heads but also to hard disk drives and the like as long as they are composite type magnetic heads.

[Effects of the Invention] As explained above, according to the magnetic head of the present invention, the slider can be manufactured at low cost by integrally forming the slider, and the core chip can be accurately attached to the slider by a simple welding operation. be able to.

Thereby, difficulties in manufacturing the magnetic head can be solved, and an inexpensive magnetic head can be obtained.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an embodiment of the present invention, Fig. 2 is an explanatory diagram showing the operation of the embodiment, Fig. 3 is an exploded perspective view showing the configuration of a conventional magnetic head, and Fig. 4 is a conventional magnetic head. Figures 5 (A), (B), and (C) are perspective views showing the assembled state of the head; Figures 5 (A), (B), and (C) are perspective views showing the configuration of a magnetic head using a conventional integrated slider; Figure 6 (A);
, (B), and (C) are explanatory diagrams showing the conventional core chip mounting operation, and FIG. 7 is a graph diagram showing the relationship between the clearance and the glass inflow speed. 10... Core chip 20... Slider 22... Core chip holding holes 26a, 26b, 28a, 28b, 30, 32...
convex part

Claims (1)

[Claims] A core chip having a recording/reproducing and/or erasing gap; and an integrally molded slider having a rectangular core chip holding hole for holding the core chip, the core chip being held in the core chip holding hole. In the magnetic head configured by inserting the core chip into the slider and fixing it to the slider using a welding agent, the core chip holding hole has at least two protrusions formed on both sides of the long side, and the core chip holding hole has at least two protrusions formed on both sides of the short side. A magnetic head characterized in that at least one convex portion is formed on each surface, and the core chip is inserted into a space surrounded by the tip surfaces of all the convex portions.