JPS63292413A - Floating type magnetic head - Google Patents

Abstract

PURPOSE:To avoid a crack of a head chip caused by a difference of a thermal expansion coefficient at the tie of burying and fixing the head chip into a head chip inserting groove of a slider, by forming the slider by a magnetic material in the same way as the head chip. CONSTITUTION:In floating surfaces 24, 25 provided in the longitudinal direction on both sides of magnetic disk opposes surfaces of a slider 20 consisting of Mn-Zn ferrite of a polycrystal structure being an oxide magnetic material, a head chip inserting groove 21 which extends in the thickness direction is provided on the rear end part side of one floating surface 24, and on the inside of this groove 21, a high melting point glass layer 28 whose thermal expansion coefficient is almost the same as Mn-Zn ferrite is formed and through this layer, a head chip 22 is inserted into the head chip inserting groove 21 and fixed. The slider 20 is formed from a magnetic material in the same way as the head chip 22 and its thermal expansion coefficient is approximate, therefore, at the time of fixing the head chip 22 by molten glass, a crack of the head chip 22 caused by a difference of the thermal expansion coefficient can be avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a floating magnetic head suitable for use in a magnetic disk device such as a file device of an electronic computer.

[1 Summary of the Invention] The present invention relates to a floating magnetic head used in a magnetic disk device such as a file device of an electronic computer, which includes a slider and a bed chip insertion groove formed at the rear end of the slider. In a floating magnetic head having a buried head chip, the slider is made of a magnetic material like the head chip, and when the head chip is fixed to the hent chip insertion groove of the slider with molten glass, the head chip and the slider are This makes it possible to avoid cracking of the head chip due to the difference in the thermal expansion coefficient of the
When chamfering, be careful not to chip the head chip, and also avoid chipping that adheres to the slider when processing the slider, fine dust that adheres to the slider due to the slider being charged, and magnetic disks caused by the hardness of the slider. The C3S characteristics can be improved by avoiding damage to the C3S.

[Conventional technology]

2. Description of the Related Art Hitherto, a floating magnetic head for use in a magnetic disk device, which is a file device of an electronic computer, has been proposed, as shown in a perspective view in FIG.

As shown in FIG. 14, this flying type magnetic head (1) is constructed by fixing a head chip (3) to a slider (2) that serves as a flying member. In this case, the slider (2) is made of calcium titanate, which is a non-conductive, non-magnetic material, and the head chip (3) is made of polycrystalline Mn--Zn ferrite, which is an oxide magnetic material. Further, a groove (4) extending in the longitudinal direction is formed on the magnetic disk facing surface of the slider (2).
One and the other air bearing surfaces (5) and (6) are provided on both sides of this 'a (4), and the front end sides of these one and other air bearing surfaces (5) and (6) are provided with inclined surfaces ( 7) and (8) are formed to ensure good flying when the magnetic disk rotates.

Further, a head chip insertion groove (9) extending in the thickness direction is formed on the rear end side of one of the air bearing surfaces (5), and the hent tip (3) is inserted into this head chip insertion groove (9).
It is fixed in this head chip insertion groove (9) by low melting point glass (10). As shown in FIG. 15, the head chip (3) has an I-shaped core (11) made of polycrystalline Mn-Zn ferrite and a C-shaped core made of polycrystalline Mn-Zn ferrite. A core (12) is joined with a low melting point glass (3A) to form an annular structure, and a magnetic gap (13) is provided at the upper end. Therefore, a groove (14) extending in the width direction is formed on the rear end surface of the slider (2), and a coil (15) is wound around the I-shaped core (11) of the head chip (3) through this groove (14). It is made so that it can be done.

The floating magnetic head (11) constructed in this way is generally a supporting member (16) movable back and forth, as shown in FIG.
) is attached via a spring member (17) to the tip of the magnetic disk (18 ) so that it can simultaneously move in the radial direction.

Here, when the magnetic disk (18) is stationary, these floating magnetic heads (1) are attached to the spring member (17).
However, when the magnetic disk (18) rotates during recording and reproduction, as shown in FIG. (61), and due to this air flow, the floating magnetic head (1) flies slightly, for example, by about 0.3μ, against the elastic force of the spring member (17), and this floating position is Recording and reproduction will be performed on the magnetic disk (18) while it is being held.

Such a floating magnetic head (1) has a magnetic disk (18)
Since there is no contact with the magnetic disk (18) during rotation, wear of the magnetic disk (18) can be avoided, which has the advantage of improving reliability.

[Problem that the invention seeks to solve]

However, in such a conventional floating magnetic head (1), the slider (2) has a thermal expansion coefficient of 120
The head tip (3) is made of calcium titanate with a coefficient of thermal expansion of 110.
Since it is formed of Mn-Zn ferrite with X 1O-1de9-', the head chip 13)
When fixing the slider (2) with the low melting point glass (10), these Herad tip (3) and the slider (
Due to the difference in thermal expansion coefficient between the head chip (3) and
) and the low melting point glass (10) were prone to cracking.

In addition, the slider (2) made of calcium titanate has many pores on its surface, so when the slider (2) is processed, shavings enter the pores, and the slider (2) made of calcium titanate, which is a non-conductive material, gets into the pores.
) is prone to attracting fine dust due to electrostatic charge, and the slider (2) made of calcium titanate has high hardness.
These shavings, fine dust, and high hardness of the slider (2) cause damage to the magnetic disk (18), resulting in a deterioration of so-called C5S characteristics (contact start-stop) characteristics. The magnetic head (1) contacts the magnetic disk (18) until it floats, so the flying surface (51 (6)) of the slider (2), the magnetic disk facing surface of the head chip (3), and the low melting point glass ( Although it is necessary to finish the surface facing the magnetic disk (10) to a mirror finish, the slider (2) formed of calcium titanate and Mn-
Since its hardness is different from that of the head tip (3) formed of Zn ferrite, it is difficult to obtain flatness. There is an inconvenience that the chip (3) may be ground too much, resulting in a step between the air bearing surface (5) of the slider (2) and the magnetic disk facing surface of the Herad chip (3). Zn
If an attempt was made to use a grindstone suitable for ferrite to polish without creating such a step, it would take an extremely long processing time.

In addition, since there is a difference in hardness between calcium titanate and Mn-Zn ferrite, if you try to chamfer the rear end surface using a grindstone suitable for calcium titanate, which has a high hardness, the head tip (3) There is also the problem that the ridge on the rear end surface may be missing.

SUMMARY OF THE INVENTION An object of the present invention is to provide a floating magnetic head that eliminates such disadvantages.

[Means for solving problems]

As shown in FIG. 1, for example, a floating magnetic head according to the present invention includes a slider (20) made of a magnetic material and a head chip insertion groove (21) formed at the rear end of the slider (20). The head chip (22) is provided with a head chip (22).

[Effect]

In the present invention, since the slider (20) is made of a magnetic material like the Herad tip (22), the coefficient of thermal expansion of the slider (20) and the head tip (22)
The coefficient of thermal expansion matches or approximates the coefficient of thermal expansion of

For this reason, the head chip (2
2) into the head chip insertion groove (21) of the slider (20).
), the head chip a due to the difference in thermal expansion coefficient between the head chip (22) and the slider (20)
X) cracks can be avoided.

In addition, since the slider (20) made of magnetic material has fewer pores on its surface than the slider made of calcium titanate, it is possible to reduce the amount of chips that enter the pores on the surface when processing the slider (20). By grounding the slider (20) made of magnetic material, it is possible to avoid the attachment of fine dust due to charging. Further, the slider (20) made of a magnetic material can have lower hardness than the slider made of calcium titanate. This makes it possible to avoid damage to the magnetic disk (18) caused by shavings that adhere to the slider during slider processing, fine dust that adheres to the slider due to the slider being charged, and the hardness of the slider, improving C3S characteristics. can be done.

Further, in the present invention, as described above, the slider (20)
Since the head tip (22) is made of magnetic material like the head tip (22), the hardness of the slider (20) and the head tip (22)
The hardness corresponds to or is similar to the hardness of 2). For this reason, the air bearing surface of the slider (20), the head chip (
When mirror-polishing the magnetic disk facing surface of 22), it is easy to obtain flatness, and it is possible to prevent a difference in level between the air bearing surface of the slider (20) and the magnetic disk facing surface of the head chip (22). When the rear end surface of the slider (20) is chamfered, the rear end surface of the head chip (22) can be smoothly chamfered without being chipped.

〔Example〕

Hereinafter, first, a first embodiment of the floating magnetic head of the present invention will be described with reference to FIGS. 1 and 2.

In FIGS. 1 and 2, (20) indicates a slider made of Mn-Zn ferrite with a polycrystalline structure, which is an oxide magnetic material.
A longitudinally extending groove (23) is formed in the center of the magnetic disk facing surface of the slider (20) made of Zn ferrite, and air bearing surfaces (24) (25) extend longitudinally in the form of strips on both sides of this groove (23). and these air bearing surfaces (
24) Slanted surface (26) (27) on the front end side of (25)
) to ensure good levitation when the magnetic disk rotates. Further, a head chip insertion groove (21) extending in the thickness direction and having a constant width is provided on the rear end side of one of the air bearing surfaces (24) and (25). 21) and fix the head chip (22) therein.

In this case, a high melting point glass 1 (2B) made of a high melting point glass whose coefficient of thermal expansion is approximately the same as that of Mn-Zn ferrite having a polycrystalline structure is formed inside the head chip insertion groove (21), and this high melting point glass 1 (2B) is The head chip (22) is inserted into the head chip insertion groove (21) through the glass layer (28) to achieve magnetic separation between the head chip (22) and the slider (211), and to separate the head chip (22) from the upper part of the hent chip (22). The thermal expansion coefficient is set between the high melting point glass layer (28) and the polycrystalline structure M
Low melting point glass (29
) to fix the head chip (22) in the head chip insertion groove (21). Further, in this example, the rear end surface (30) of the head chip (22)
) and the rear end surface (31) of the slider (20) are approximately flat, insert the head chip (22). 1
4 Fix it to (21). Head chip here (22)
As shown in Fig. 2, the core is made of Mn-Zn ferrite with a polycrystalline structure and is approximately C-shaped (hereinafter referred to as the C-shaped core) with the upper part, that is, the side where the magnetic gap is formed, being narrower.
Like (32), the core is made of Mn-Zn ferrite with a polycrystalline structure, and is approximately I-shaped with the upper part, that is, the side where the magnetic gap forms, narrower (hereinafter referred to as the "1-shaped core").
(33) is joined with low melting point glass Jii (34),
It is constructed by forming a magnetic gap (35) at the top. Therefore, in this example, the slider (2
0) A groove (36) extending in the width direction is provided on the rear end surface (31), and the C of the head chip (22) is passed through this groove (36).
A coil (37) can be wound around the glyph-shaped core (32).

Next, with reference to FIGS. 3 to 6, the manufacturing of the floating magnetic head shown in FIG. 1 will be explained.

First, a slider member having a rectangular parallelepiped shape made of Mn-Zn ferrite having a polycrystalline structure is prepared, and as shown in FIG. - A groove (23) is formed, and both sides of this groove (23) are air bearing surfaces (24) (25).
After that, slope surfaces (26) and (27) are formed on the front end sides of the air bearing surfaces (24) and (25), and then inclined surfaces (26) and (27) are formed on the rear end side of one of the air bearing surfaces (24) in the thickness direction. An extending head chip insertion groove (21) is formed. In this case, the inclined surface (26
) The inclination angle in (27) is, for example, about 5 minutes. Also, the width of the head 4'7 insertion groove (21) is
), for example, about 250 μm, which is about 100 μm wider than 150 μm.

Next, as shown in FIG. 4, the head chip insertion groove (21) is filled with high melting point glass (38) having a melting point of, for example, 750°C, and after solidifying this high melting point glass (38), the fifth
As shown in the figure, the head chip insertion groove (21) is filled with high melting point glass so that a high melting point glass layer (28) having a thickness of, for example, 50 μm is formed inside the head chip insertion groove (21). (38) was ground and the head chip (
A groove (40) into which a head chip (22) can be inserted is formed, and a head chip (40) is formed in the rear end surface (31) of the slider (20).
22) is a groove (
36).

Next, prepare the Herad tip (22) shown in Figure 2,
As shown in Fig. 6, this head chip (22) is inserted into the head chip insertion groove (21) so that the C-shaped core (32) is arranged at the rear end and the ■-shaped core (33) is arranged at the front end. insert,
Thereafter, the melting point is set to, for example, 550'C to 550'C in the space between the upper part of the head chip (22) and the high melting point glass layer (28).
A low melting point glass (29) of 600" C is melted and poured into it, and the head chip (22) is fixed in the head chip insertion groove (21) of the slider (20) via the high melting point glass layer (2 days). In this case, as shown in Fig. 7, a low melting point glass R (42) is formed in advance in the upper narrow part of the hent tip (22), and this head chip (22) is attached to the head chip. After inserting into the insertion groove (21) through the high melting point glass l'ii (2B), heat is applied to melt the low melting point glass layer (42) to form this hent tip (2).
2) may be fixed.

Next, mirror the air bearing surface (24 x 25) of the slider (20), the magnetic disk facing surface of the head chip (22), the magnetic disk facing surface of the high melting point glass M (28), and the magnetic disk facing surface of the low melting point glass (29). After polishing and chamfering each surface, the C-shaped core (
32) by winding the coil (37) around the first
The floating magnetic head shown in the figure can be obtained.

In the floating magnetic head shown in FIG. 1, the slider (20) is made of polycrystalline Mn-Zn ferrite like the Herad tip (22).
The thermal expansion coefficients of the slider (20) and the head chip (22) completely match. Also, the high melting point glass (38) and the low melting point glass (29) forming the high melting point glass layer (28)
) have the same coefficient of thermal expansion as Mn--Zn ferrite having a polycrystalline structure.

Therefore, according to the floating magnetic head of the example in FIG. 1, the head chip (29) is
2) through the high melting point glass layer (28) and the slider (2).
When fixing to the hent tip insertion groove (21) of 0),
There is an advantage that cracking of the head chip (22), cracking of the high melting point glass layer (28) and cracking of the low melting point glass (29) due to differences in thermal expansion coefficients can be avoided.

Further, in the floating magnetic head of the example shown in FIG. 1, the slider (20) is formed of Mn-Zn ferrite having a polycrystalline structure, as described above.
The slider (20) made of n-ferrite has fewer pores on its surface than the slider (2) made of calcium titanate shown in FIG. The slider (20) formed of Mn--Zn ferrite having a polycrystalline structure can be grounded to reduce the amount of shavings entering the slider, and can also avoid the adhesion of fine dust due to charging. Furthermore, the slider (20) made of polycrystalline Mn-Zn ferrite can have lower hardness than the slider (2) made of calcium titanate.

Therefore, according to the floating magnetic head of the example shown in FIG. ) damage can be avoided and C8S characteristics can be improved.

Furthermore, in the floating magnetic head of the example in FIG. 1, the slider (20) is formed of polycrystalline Mn-Zn ferrite like the bed chip (22) as described above. and head tip (2
The hardness with 2) completely matches.

Therefore, according to the floating magnetic head of the example in FIG. 1, the floating surface (24) of the slider (20), the head chip (
22) When polishing the surface facing the magnetic disk to a mirror finish, it is easy to obtain flatness, and it is possible to prevent a step from forming between the air bearing surface (24) of the slider (20) and the surface facing the magnetic disk of the Herad tip (22). Slider (20)
When chamfering the rear end surface (31), there is an advantage that the edge of the rear end surface (30) of the head chip (22) will not be missing.

Next, a second embodiment of the floating magnetic head of the present invention will be described with reference to FIG.

The floating magnetic head shown in FIG. 8 has a slider (2
A head chip insertion groove (43) is provided in the center of the rear end of the groove (23) formed on the surface facing the magnetic disk of 0), and a high melting point glass layer (44) is provided inside this head chip insertion groove (43). The head chip (22) is inserted into the head chip insertion groove (43) through the high melting point glass layer (44).
), and the head chip (22) is fixed with a low melting point glass (45), and the other components are the same as the example shown in FIG.

The floating magnetic head of the example in FIG. 8 can also provide the same effects as the example in FIG. 1.

Next, a third embodiment of the floating magnetic head of the present invention will be described with reference to FIG.

The floating magnetic head shown in FIG. 9 has a slider (2
A head chip insertion groove (46) is provided on the air bearing surface (25) side of the rear end of the groove (23) formed on the surface facing the magnetic disk of 0), and a high melting point glass layer (46) is provided inside this hent chip insertion groove (46). 47), and this high melting point glass N (
The head chip (22) is inserted into the hent chip insertion groove (46) through the glass (47), and the head chip (22) is fixed with the low melting point glass (48), and the other configuration is the same as the example in Fig. 1. It is something.

In the example shown in FIG. 9 as well, the same effects as in the example shown in FIG. 1 can be obtained.

Next, a fourth embodiment of the present invention will be described with reference to FIG. 1O.

In this example in FIG. 10, a head chip insertion groove (49) extending in the thickness direction is formed at the rear end of the air bearing surface (24), but this head chip insertion groove (49) (50), and the groove has a so-called two-stage structure with a narrow portion (51) on the front end side. In this case, the width of the narrow portion (51) is set to be slightly wider than the width of the helad tip (22). In this example in FIG. 10, the I-shaped core (33) of the head chip (22)
) into the narrow part (51) and insert the low melting point glass (5
2). In this case, the part of the C-shaped core (32) around which the coil (37) is wound is completely wide part (50
) so that it does not touch the slider (20) at all, and the slider (20) and C-shaped core (32)
and can be magnetically separated.

In addition, in this example of FIG. 10, as shown in FIG. 11, a groove ( 53), this groove (53) is filled with low melting point glass (52) in advance, and after inserting the I-shaped core (33) into the narrow part (51), it is heated to melt the low melting point glass (52). Melting point glass (
52) to form the narrow part (33) of the I-shaped core (33).
51). The rest of the structure is the same as the example shown in FIG.

In this example in FIG. 10, the same effect as in the example in FIG.
Since magnetic separation between the bed chip (22) and the slider (20) is achieved by preventing the part 2) from coming into contact with the slider (20), high melting point glass Jiii ( There is no need to form 2B), and there are advantages in that the number of members and the number of manufacturing steps can be reduced accordingly.

Next, a fifth embodiment of the present invention will be described with reference to FIG.

The floating magnetic head shown in FIG. 12 has a slider (2
A head chip insertion groove (56) having a narrow part (54) and a wide part (55) is provided in the center of the rear end of the groove (23) formed on the surface facing the magnetic disk of 0). The head chip (2
The I-shaped core (33) of 2) is inserted and fixed, the C-shaped core (32) is arranged in the wide part (55), and the other parts are configured in the same way as the example in Figure 1. be.

In the example shown in FIG. 12, the same effects as in the example shown in FIG. 10 can be obtained.

Next, a sixth embodiment of the present invention will be described with reference to FIG.

The floating magnetic head shown in FIG. 13 has a slider (
A narrow part (57) and a wide part (58) are formed on the air bearing surface (25) side of the rear end of the groove (23) formed on the magnetic disk facing surface of the magnetic disk (20).
), and the I-shaped core (33) of the head chip (22) is inserted and fixed into the narrow part (57) of the head chip insertion groove (59), and the I-shaped core (33) of the head chip (22) is fixed. The glyph-shaped core (32) is disposed in the wide portion (58), and the other features are the same as in the example shown in FIG.

In this example in FIG. 13 as well, the same effects as in the example in FIG. 10 can be obtained.

In the above embodiment, the slider (20) was formed using Mn-Zn ferrite having a polycrystalline structure, but instead, Mn-Zn having a single crystalline structure
The slider can be formed using ferrite, Ni--Zn ferrite with a polycrystalline structure, Ni--Zn ferrite with a single-crystalline structure, or the like, and in this case as well, the same effects as described above can be obtained.

Furthermore, in the above embodiment, the head chip (22) was formed using Mn-Zn ferrite having a polycrystalline structure, but instead, Mn-Zn having a single crystalline structure
The hentochive can be formed using n-ferrite, polycrystalline Ni--Zn ferrite, single-crystalline Ni--Zn ferrite, etc., and in this case, the same effects as described above can be obtained.

Further, the present invention is not limited to the above-described embodiments, and it goes without saying that various other configurations may be adopted without departing from the gist of the present invention.

〔Effect of the invention〕

According to the present invention, since the slider is made of a magnetic material like the Herad tip, when the head chip is fixed to the head chip insertion groove of the slider with molten glass, the difference in thermal expansion coefficient between the hent tip and the slider is There is an advantage that cracking of the head chip caused by this can be avoided.

Further, according to the present invention, the slider is formed of a magnetic material as described above, but since a slider made of a magnetic material has fewer pores on its surface than a slider made of calcium titanate, when processing the slider, In addition to reducing the amount of shavings that enter the pores on the surface, the slider made of magnetic material can be grounded to eliminate the electrical charge, thereby avoiding the adhesion of fine dust due to charging, and the slider made of magnetic material The hardness of the slider can be lower than that of sliders made of calcium titanate, so there are no shavings that get into the pores on the slider surface when the slider is processed, fine dust that sticks to the slider when the slider is charged, and the hardness of the slider. This has the advantage that damage to the magnetic disk caused by this can be avoided and C3S characteristics can be improved.

Further, according to the present invention, as mentioned above, the slider is formed of a magnetic material like the herad tip, so the hardness of the slider and the hent tip are the same or similar, so that the flying surface of the slider and the magnetic disk of the head chip are the same or similar in hardness. When mirror polishing the opposing surface, it is easy to obtain flatness, and when chamfering is performed, there is an advantage that the head tip is not chipped and a good chamfer can be performed.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a first embodiment of the floating magnetic head of the present invention, FIG. 2 is a perspective view of a head chip used in the floating magnetic head of the example shown in FIG. Figure 4, 5th
6 and 7 are diagrams showing an example of the manufacturing process of the floating magnetic head shown in FIG. 1, FIG. 8 is a perspective view showing the second embodiment of the present invention, and FIG. FIG. 10 is a perspective view showing the fourth embodiment of the invention, FIG. 11 is a diagram for explaining the example of FIG.
13 is a perspective view showing a sixth embodiment of the present invention, FIG. 14 is a perspective view showing an example of a conventional floating magnetic head, and FIG. Figure 15 is the 14th
A perspective view of a head chip used in the floating magnetic head shown in the example, FIGS. 16 and 17 are diagrams for explaining the example shown in FIG. 14, respectively. (20) is a slider, (21), (43),
(46), (49). (56) and (59) are respectively the Rad tip insertion groove and (2
2) is the head chip.

Claims (1)

[Claims] A floating magnetic head comprising a slider made of a magnetic material and a head chip embedded in a head chip insertion groove formed at the rear end of the slider.