JPH0550575U - Composite flying magnetic head - Google Patents

Abstract

(57) [Abstract] [Purpose] The purpose of the present invention is to prevent the slider surface from jumping up due to the tension spreading vertically due to the winding wound around the magnetic head core. A ring-shaped magnetic head core 2 in which two core members are joined is attached to a core slit 6 formed so as to be cut inward from an air outflow end side of a slider 1, and one of the magnetic head cores 2 is attached. In the composite flying magnetic head in which the winding 3 is wound around the core member 21, the notch 9 is formed on the air outflow end side on the back side of the slider 1.
Is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 INDUSTRIAL APPLICABILITY The present invention is used for a magnetic disk or the like which is connected to a computer or the like to record / reproduce information, and in particular, it is a composite type flying magnetic head which floats on a rotating magnetic disk medium to record / reproduce information. It is about.

[0002]

[Prior Art]

 In the conventional composite floating magnetic head, high-speed access and high-speed information processing have been advanced, and miniaturization of the magnetic head is required. With this miniaturization, the rigidity of the magnetic head, especially of the slider, is decreasing.

[0003]

[Prior Art]

 As shown in FIG. 5, a conventional composite floating magnetic head is composed of a slider 1 made of non-magnetic ceramic, a magnetic head core 2 of a ring-shaped magnetic body, and a winding 3 (not shown in FIG. 5). ing.

The slider 1 has a substantially rectangular parallelepiped shape, and levitation rails 4 and 5 are formed on the main surface of the slider 1 facing the magnetic recording medium (not shown). A core slit 6 cut in a predetermined inward direction is formed from an air outflow end surface which is a surface, and a winding slot 7 is formed so as to penetrate from the air outflow end surface to one side surface of the slider 1. A ring-shaped magnetic head core 2 formed by joining two core members to each other is attached to the core slit 6 of the slider 1 thus formed, and further firmly joined by the joining glass 8.

As a result, a part of the magnetic head core 2 is exposed from the winding slot 7, and a portion of the magnetic head core 2 exposed from the winding slot 7, for example, the ferrite bar 21, is wound for electromagnetic conversion. The wire is wrapped.

Since the composite type flying head flies over the magnetic disk medium with a very small gap of 0.1 μm, its air bearing surface is required to have a highly precise planar shape.

[0007]

[Problems of conventional technology]

 Due to the miniaturization of the composite type flying magnetic head, the shape of the winding window of the ring-shaped magnetic head core 2 becomes small, and it becomes difficult to maintain a sufficient size for the winding.

As shown in FIG. 6, the winding 3 is wound about 20 to 30 times around the portion where the magnetic head core 2 is exposed from the winding slot 7, and the winding having a diameter of about 10 to 30 μm. The wire 3 is wound around the ferrite bar 21 so as to be stacked in about 3 to 5 steps.

Therefore, as shown in FIG. 6, a tension F is generated so that the winding 3 spreads vertically in the height direction of the magnetic head core 2. As a result, the slider 1 around the core 2 is flipped up from the air bearing surface, and the flying height is varied. It was confirmed that the amount of bounce measured by the present inventor was as large as 50 nm.

Due to this jump, the flying height between the magnetic disk medium and the slider 1 is abnormally reduced, or the flying height varies greatly. In addition, since the composite floating magnetic head is in contact with the magnetic disk medium in the stopped state, the magnetic disk medium will be unnecessarily damaged when starting or stopping.

The present invention has been devised in view of the above problems, and prevents the slider 1 around the core portion 2 from jumping up due to the tension when the core portion 2 is wound, and the flying height is increased. The object is to provide a composite type flying magnetic head with constant and small variations.

[0012]

[Means for Solving the Problems]

 According to the present invention, a ring-shaped magnetic head core, which is formed by joining two core members, is mounted in a core slit cut inward from the end surface of the slider, and a winding is attached to the core member of the magnetic head core. In the composite type flying magnetic head formed by winding, a notch portion is provided on the terminal surface side of the slider back surface so that a part of the core member around which the winding is wound is projected.

[0013]

[Action]

 With the above configuration, the back side of the slider can be free in a part of the magnetic head core. Therefore, even if a part of the ferrite bar of the magnetic head is wound through the winding slot and the winding window of the magnetic head core 2, the tension that spreads in the vertical direction, which is generated by the winding, is applied to the back side of the slider. Since it can be absorbed by the free protruding part of the slider, it does not give any tension to the slider surface.

For this reason, since the rebound that occurs on the slider surface side around the core can be sufficiently reduced, the flatness of the slider air bearing surface can also be maintained with high accuracy, stable flying can be realized, and the recording density can be improved. Help improve.

[0015]

【Example】

 The present invention will be described below with reference to the drawings. FIG. 1 is an external perspective view showing an embodiment of the present invention. The same parts as those of the prior art will be described with the same reference numerals.

As shown in FIG. 1, the composite floating magnetic head is composed of a slider 1 made of non-magnetic ceramic such as calcium titanate, a magnetic head core 2 of a ring-shaped magnetic body, and a winding 3. ..

The slider 1 has a substantially rectangular parallelepiped shape, and levitation rails 4 and 5 are formed on the main surface on the side facing a magnetic recording medium (not shown), and one levitation rail 4 side has a terminal end. A core slit 6 cut in a predetermined inward direction is formed from an air outflow end surface which is a surface, and a winding slot 7 is formed so as to penetrate from the air outflow end surface to one side surface of the slider 1. Further, like the back surface of the slider 1 shown in FIG. 2, a cutout portion 9 including the core slit 6 and penetrating between both side surfaces is formed on the air outflow end surface side.

A ring-shaped magnetic head core 2 formed by joining two core members to each other is attached to the core slit 6 of the slider 1 formed as described above, and further firmly joined by the joining glass 8.

As a result, a part of the ferrite member 21 of the magnetic head core 2 is exposed from the winding slot 7, and further, the front end of the ferrite member 21 exposed from the winding slot 7 is also exposed. become. Therefore, what mechanically fixes the magnetic head core 2 to the slider 1 is the gap between the bonded glass 8 filled in the slider front surface side of the core slit 6 and the remaining core slit 61 on the slider back surface and the magnetic head core 2. This will be achieved by the filled bonding glass 8 or the adhesive resin.

In the slider 1 and the magnetic head core 2 having such a structure, the ferrite bar 21 which is a part of the magnetic head core 2 exposed from the winding slot 7 is electromagnetically converted through the winding slot 7 and the winding window. The winding 3 for winding is wound.

Next, a brief description will be made on a method of manufacturing the composite type flying magnetic head of the present invention. In addition, the slider 1 having the above-described structure, that is, the floating rails 4 and 5, the core slit 6, the winding slot 7 and the rear surface side cutout portion 9 is ground from a non-magnetic ceramic block body such as calcium titanate. Created by.

Next, although not shown, an I-bar-shaped ferrite member and a C-bar-shaped ferrite member are joined via a gap member to form a ring-shaped magnetic head core 2.

Next, the magnetic head core 2 is mounted in the core slit 6 of the slider 1, and the bonding glass 8 is melted and filled in the gap between the core slit 6 and the magnetic head core 2 on the front surface side. Further, a bonding glass or an adhesive resin is filled and cured in the gap between the core slit 61 and the magnetic head core 2 from the back surface side of the slider 1.

Next, the surfaces of the flying rails 4 and 5 of the joined body of the slider 1 and the magnetic head core 2 are mirror-finished by lapping and polishing. By this mirror surface processing, unnecessary bonding glass 8 on the front surface side is removed, and the gap depth is strictly controlled.

Finally, the winding 3 is wound a predetermined number of times through the winding slot 7 and on the ferrite member 21 which is a part of the magnetic head core 2 exposed from the winding slot 7.

In the composite-type flying magnetic head manufactured as described above, the tension spreading vertically due to the winding 3 generated in the winding step which is the final step in the related art is exposed from the winding slot 7 by the ferrite member. Since it is absorbed in the free state portion exposed from the notch 9 of 21, the jumping up on the surface side of the slider 1, particularly around the core slit 6 of the levitation rail 4, becomes extremely small.

The inventor of the present invention measured the cut amount of the cutout portion 9 to the inside of the slider 1. The result is shown in FIG. In FIG. 3, the notch ratio amount of the notch 9 on the horizontal axis is shown by the ratio from the air outflow end face side of the slider 1 to the tip portion of the core slit 61. That is, the notch amount of 1.0 means that the notch portion 9, which is the portion indicated by the alternate long and short dash line in FIG. 2, is formed up to the same position as the tip of the core slit 61. The core slit 61 is 1.1 mm.

As is clear from the figure, a jump of about 50 nm occurs in a conventional composite-type flying magnetic head that does not have any notch on the back surface. On the other hand, if the core slit 61 is formed so as to be entirely exposed in the cutout portion 9, the jump due to the winding can be reduced to about 5 nm.

In an actual composite type flying magnetic head, if the amount of jump is about 10 nm, the flying height becomes sufficiently constant, its variation and CSS characteristics are improved. To some extent, actually, it is desirable that the notch 9 is formed by 0.55 mm or more from the air outflow end surface of the slider 1.

The notch 9 in the height direction from the back surface to the front surface of the slider 1 may be formed so as to reach the winding slot 7 as shown in FIG.

FIG. 4 is an external view of a composite type flying magnetic head showing another embodiment of the present invention.

The cutout portion 9 in FIG. 1 is formed over the entire width so as to penetrate both side surfaces of the slider 1, but as shown in FIG. 4, the cutout portion 9 of the magnetic head core 2 around which the winding is wound is formed. The notch 12 may be provided only at one corner of the slider 1 so that only the light member 21 is exposed. By selectively forming the notch 12 only in the required portion in this manner, the back surface area of the slider 1 increases. As a result, for example, when the surface of the levitation rails 4 and 5 formed on the surface of the slider 1 is mirror-finished, the slider 1 can be stably fixed to the lapping jig, so that the mirror-finishing can be performed quickly and reliably. You can do it.

[0033]

[Effect of the device]

 As described above, according to the present invention, the back side of a part of the magnetic head core mounted on the slider and around which the winding is wound is exposed by the notch formed on the back side of the slider. Since the exposed portion absorbs the tension generated by spreading due to the vertical direction, it is possible to effectively prevent the air bearing surface-shaped jumping up of the core peripheral portion on the slider surface side. As a result, the flying height is stable, and a high-performance floating magnetic head with less variation is obtained.

Further, the CCS characteristics are improved, and the composite type flying magnetic head capable of reducing the damage of the disk is obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of a composite type flying magnetic head of the present invention.

FIG. 2 is a rear view of the composite floating magnetic head of the present invention.

FIG. 3 is a characteristic diagram showing a relationship between a notch ratio of a notch and a jump amount.

FIG. 4 is a perspective view of another composite type flying magnetic head of the present invention.

FIG. 5 is a perspective view of a conventional composite floating magnetic head.

FIG. 6 is a diagram for explaining tension by windings.

[Explanation of symbols]

 1-Slider 2-Magnetic head core 3--Winding 4, 5-Floating rail 6,61-Core slit 7- Winding

Claims (1)

[Scope of utility model registration request] 1. A ring-shaped magnetic head core in which two core members are joined is mounted in a core slit cut inward from the end face of a slider, and a winding is provided in the core member of the magnetic head core. In a composite type flying magnetic head formed by winding, a notch is provided on a rear end surface side of the slider back surface so that a part of a core member around which the winding is wound protrudes. Type floating magnetic head.