JPS6329316A - Floating type magnetic head - Google Patents

Abstract

PURPOSE:To attain the stable floating by injecting glass or resin into both sides of a magnetic chip. CONSTITUTION:A part of CaTiO3 to form an air bearing surface out of the surface to press a chip 8 is notched, the same glass is used to heat it to 450 deg.C and the glass is injected to the notched part. A notched part 18 is made parallel to the chip, and the clearance of the chip and an upper part 19 of the CaTiO3 to form the air bearing surface is made into 20mum. At the time of positioning of the chip, since a clearance is not provided between a lower part 0 of the CaTiO3 and the chip, no hindrance is caused to positioning, glass is heated in an electric furnace, the condition after the heated glass is injected is observed by a microscope, and it can be confirmed that the glass is injected the cutting- out part 18. Consequently, for the magnetic head, flatness of the air bearing surface after grinding and working are applied is satisfactory, and a stable floating can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to magnetic disk drives, and is aimed at improving the flatness of a flying magnetic head that is used in a way that is floated slightly above the surface of a recording medium.

[Conventional technology]

For example, USP-382341 is a magnetic head used for reading information in a magnetic disk device.
A so-called Winchester-type flying magnetic head, as shown in 6.% Publication No. 57-569, is often used. In this floating magnetic head, a magnetic conversion gap is provided at the rear end of the slider, and the entire head is made of an oxide magnetic material with high magnetic permeability. A floating magnetic head lightly contacts the magnetic disk due to the force of a spring when the magnetic disk is stationary. Furthermore, when the magnetic disk is rotating, the air on the surface of the magnetic disk moves and exerts a force that lifts the bottom surface of the slider. Therefore, the magnetic head floats and is away from the magnetic disk during rotation. This separation is called the flying height. The flying height is decreasing year by year due to the increasing density of magnetic disk drives.
Computer Str published by Dataquest
age Industry)' Seruice(Rig
id Disk Drive edition) 1984 edition 2.2-
According to the description on page 6, the flying height is 10 microinches (0.2
In order to keep the submicron flying height, which has reached 5 μff, stable during the rotation of the magnetic disk, special K.
It is necessary to maintain good flatness of the air bearing surface of the magnetic head.The levitation of the magnetic head is achieved by the air flow flowing into the extremely small gap between the air bearing surface of the magnetic head and the medium. This is because if the flatness of the surface is poor, stable levitation cannot be achieved. Above USP
The air bearing surface that controls the flying of the magnetic head as described in No. 3825416 is formed of a single member such as Ni-Zn or Mn-Zn ferrite, and it is easy to obtain good flatness. On the other hand, with the improvement of high-pressure magnetic recording, a floating magnetic head called a so-called combo lift type, as shown in Fig. 10, which can obtain low inductance and narrow track width, has replaced the above-mentioned magnetic head. This magnetic head is attracting attention and is made of CaT.
A slit 6 provided in a non-magnetic slider 2 such as iOs
The magnetic head chip 3 is embedded in the magnetic head and welded with glass. What is important in this magnetic head is that the magnetic head chip 3 is embedded in the 14 (or 5) end of the air bearing surface. Therefore, since the part where the magnetic herad tip is buried also acts as an air bearing part in the same way as the non-magnetic slider surface, it is important that this part has good flatness.

The conventional method for manufacturing a magnetic head as shown in FIG. 10 has a drawback in that the flatness of the portion where the magnetic head chip is buried is poor, as will be described in detail later.

[The gap that the invention attempts to solve]

The present invention solves the conventional drawback of a magnetic head in which a magnetic head chip is embedded and fixed in a slit provided at one end of the air bearing surface of a non-magnetic slider, in which the flatness of the part where the head chip is embedded is poor. The objective is to solve this problem and to obtain a magnetic head that can be stably floated.

[Means for solving problems]

In order to achieve the above object, various causes of the shortcomings of the prior art were investigated, and it was found that the cause was that the glass used to embed and fix the magnetic head chip did not flow into both sides of the magnetic head chip. Therefore, the present invention is characterized in that glass (or resin) for embedding and fixing is flowed into both sides of the head chip.Examples will be described below in detail.

Prior to practical examples, the conventional technology will be explained in detail. 1st 7
10 is a side view of the magnetic head shown in FIG. 10, viewed from the direction of arrow A in FIG. 7 is an air bearing surface, and 8 is a magnetic head chip which is pressed against one end of a slider made of υCaTiOx (thermal expansion coefficient: 110x10-'deg-'). The slit 9 is filled with glass, as shown by the hatched area, to fix the chip.

10 is a magnetic conversion gap, and 15 is a window for winding. When embedding and fixing the magnetic herad chip, the magnetic transducer gap 10 must be placed in the required position, so the chip 8 is pressed against one end of the air bearing surface 7 and fixed, so that the chip 8 and the air bearing There is a portion 11 between the surface 7 and the surface 7 into which no glass flows. In order to obtain the magnetic head having the structure shown in FIG. 7, υ is manufactured by the method schematically shown in FIG.

In FIG. 8, the chip 8 is pressed and positioned against one end of the air bearing portion 7, and is temporarily fixed using, for example, lubricant 17.

Thereafter, the glass 16 to be flowed into the slit 9 is placed and heated in an electric furnace, whereby the glass 16 flows into the gap between the slits and finishes fixing. Such glass has a coefficient of thermal expansion of 90 x 10 degrees and a softening point of 4 degrees.
It is preferable to use one at 50°C and to flow in at 540°C. After solidification, unnecessary glass is removed and the air bearing surface is polished to a good level of flatness to complete the magnetic head. However, this conventional technique does not have good flatness.

FIG. 9 shows the results of measuring the flatness after polishing along the line 12-15 in FIG. 7 using a stylus type surface roughness meter. Air bearing surface on the left side in Fig. 9 (CaTiOx
) toward the right, the surface is not rough and exhibits good flatness.

However, chips without glass inflow and CaTi
The CaTiOs on the right side of the figure, with the Os boundary as a boundary, is not parallel to the three CaTiOs, and its flatness is rapidly worsening.

As a result of various studies on the cause of this problem, the inventor found that it could be solved by flowing glass into both sides of the chip. Examples are shown below. [Example 1] Figure 1 is a diagram showing an example of the present invention. Among the surfaces against which the chip 8 is pressed, Ca T forming the air bearing hole is shown.
A part of iO3 was cut out and the same glass was heated to 450° C. and the glass was introduced in the manner shown in FIG. In this embodiment, the notch 18 is parallel to the chip, and the gap between the chip and the upper part 19 of CaTiOs forming the air bearing surface is 20 μm. According to this method, when positioning the chip, the lower part 20 of CaTiOs
Since there is no gap between the chip and the chip, there is no problem with the positioning K. When the glass was heated and introduced into the electric furnace, the state was observed under a microscope and the notch 18 was observed.
It was confirmed that glass was flowing into the area. After polishing this sample, the surface roughness was similarly measured along the line shown in FIG. 7, 12-13, and the results are shown in FIG. This is the glass portion that has flowed into the notched portion 18ij in FIG. 2, and the left and right CaTiOs portions and the glasses Is i 8 and 19K show extremely good flatness throughout the chip portion.

[Example 2] FIG. 6 shows C where the chip is pressed in the same way as in the first
a In order to make a notch between the upper part 19 of the TiOs surface and the tip 8, it is necessary to make the notch not parallel to the chip but between the chip and Ca.
The lower end 22 of the TiOs is in contact with the CaTiOs, and the gap is continuously increased toward the top, and the gap between the chip and the CaTiOs at the air bearing surface corresponding to the recording medium is 1.
! J23 was set to 80 μm. When the same glass as in Example 1 was used and observed after flowing at the same temperature, it was confirmed that the glass was flowing into the diagonal notch 21. FIG. 4 shows the results of measuring the surface roughness after glass was introduced in this manner and then polished. As can be easily seen from this result, the flatness has been significantly improved compared to the results of the prior art shown in FIG.

[Embodiment 3] The key point of the present invention is to flow the glass into both sides of the chip to fix the chip to the slider. In Examples 1 and 2, a notch was provided in the slider to allow glass to flow into both sides of the chip, but such a state can also be easily achieved by providing a notch in the chip. Figure 5 schematically shows the glass inflow state when a notch is provided in the chip). A notch 24 was provided.The size of the notch was 65 μm in the horizontal direction and 50 μm in the vertical direction.The notch and the CaTiOx slider were observed under a microscope after the same glass as in Examples 1 and 2 was introduced. i of
It was observed that glass was flowing into the J+ gap 21.

The sixth factor is the result of surface roughness measurement after polishing the sample, which shows good flatness with no bending throughout the left and right Ca Ti Os parts, the left and right glass, and the entire chip part.

As detailed in the examples above, the magnetic head of the present invention has good flatness, and this effect is achieved by processing either the slider or the chip, or both, and flowing glass into both sides of the chip. . As can be seen from Example 1, the inflow width of this glass may be 20 μm or more. Furthermore, although the embodiments have shown the case where the chips are fixed using glass, it is obvious that the same applies to the case where the chips are fixed using resin.

〔Effect of the invention〕

As described in detail above, the magnetic head according to the present invention has the effect of realizing stable flying if the air bearing surface after polishing has good flatness, and has great industrial utility value.

[Brief explanation of drawings]

Figure 1.3.5 is a diagram showing the state of the chip and slider to be buried and the inflow state of fixed glass in the embodiment of the present invention, and Figure 2.4.6 is a diagram showing the implementation of each of Figures 1 and 6.5. In the example, the flatness after polishing is measured; FIG. 7 is a diagram showing the state of glass inflow according to the conventional technique; FIG. 8 is a schematic diagram showing the method of glass inflow; and FIG. 9 is the conventional technique. FIG. 10 is an external view of the magnetic head. 3.8. Step 4, 5: Air bearing surface 9°
Slit part 16: Glass rod 18.21 Two notches part 19 Nislider No. 7
Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure a Conception Day 72 Figure 8 Figure 1 and Figure q

Claims (3)

[Claims] (1) In a magnetic head in which a magnetic chip is embedded in a slit provided in the rail part that forms the air bearing surface of the slider and fixed by flowing glass or resin,
This floating magnetic head is characterized by having glass or resin injected into both sides of the chip. (2) A floating magnetic head according to claim 1, characterized in that the width of the glass flowing into both sides of the chip is 20 μm or more. (3) In claim 2, a cutout is provided in the slider above the winding window, or a cutout is provided in the corresponding chip part above the winding window to allow glass to flow in. A floating magnetic head characterized by: