JPH05174522A - Flying magnetic head - Google Patents

Abstract

PURPOSE:To prevent the appearance of a depression at the surface of the front gap of a magnetic head due to shrinkage of resin and thereby prevent detrioration of the electro-magnetic conversion characteristic of the magnetic head used for a fixed magnetic disk apparatus in a head gimbal assembly wherein the gimbal is positioned also on a block A on the side of the head on which a winding is provided. CONSTITUTION:By a construction wherein a very small stepped part 14 corresponding to the thickness of resin 4 is provided in a surface for fitting a gimbal 6 of a block B so that the resin 4 may not flow into a back gap 11, bonding and fixing are made with the resin 4 interposed only in the region of the very small stepped part 14. According to this constitution, the resin 4 is prevented from flowing into the back gap 11 and it is possible to reduce a bending moment generated by shrinkage of the resin 4 and thereby to prevent a front gap 10 from depression at its surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating magnetic head used in a fixed magnetic disk device such as a computer for recording / reproducing data.

[0002]

2. Description of the Related Art A conventional floating magnetic head will be described below. As shown in FIG. 4 and FIG. 5, a magnetic circuit component (hereinafter, referred to as A
Block) 1 and fixed disk (magnetic recording medium)
A slider having an air bearing surface for obtaining lift due to the air flow generated by the rotation of the rotor (hereinafter referred to as B block)
The floating type magnetic head 3 is formed by bonding and fixing 2 and 2 with a glass for bonding. This bonding glass serves as a gap (front gap 10 and back gap 11) of the floating magnetic head 3, and a load arm 7 is provided to apply a load that balances lift with the floating magnetic head 3 through the gimbal 6. There is. The floating posture of the floating magnetic head 3 is held by the gimbal 6 attached to the load arm 7. An insulating tube 9 covering the read / write coil wire 5 is fixed by a claw 8 formed by cutting and raising a part of the load arm 7. Since the front gap 10 of the floating magnetic head 3 is closer to the surface of the magnetic recording medium 15 to obtain higher recording density and larger output, the magnetic recording medium 1 of the normal floating magnetic head 3 is obtained.
5 is formed at the minimum clearance position on the slider surface facing the No. 5 slider.
The minimum clearance position on the slider surface is determined by the shape of the slider surface, the load, and the load action point position 13 (hereinafter referred to as the load point).

Reference numeral 12 in the drawing denotes a pivot of the gimbal 6, r is a radius of the pivot, and L is a distance from the back gap 11 to the center of the pivot 12.

Recently, fixed magnetic disk devices have become smaller and thinner. Along with this, the floating magnetic head 3 has a remarkable tendency to be thin, and the total height H of the floating magnetic head 3 is H.
However, the width dimension t of the A block 1 is 0.5 to 0.9 mm and is 0.2.
It is as thin as 0.45mm and is easily deformed by external load. The floating magnetic head 3 and the gimbal 6 are usually
It is fixed by adhesion with a resin 4 such as a thermosetting epoxy resin, but the longitudinal center line of the gimbal 6 connects the longitudinal center line of the floating magnetic head 3 (connects the head air inflow end and the air outflow end). The gimbal 6 is located also on the A block 1 on the side where the winding of the floating magnetic head 3 is applied, as represented by an in-line type mounted in parallel with the virtual center line). In the head gimbal assay (hereinafter referred to as HGA) in which the resin 4 such as the thermosetting epoxy resin flows into the back gap 11 located on the joint surface of the A block 1 and the B block 2, the arrow M indicates that the resin 4 contracts. A bending moment in the direction indicated by is generated,
Compared to the B block 2 having an air bearing surface, the thickness A is thinner.
The block 1 is recessed from the air bearing surface by a height D (about 80 nm), and the front gap 10 located at the joint surface between the A block 1 and the B block 2 is higher than the air bearing surface of the floating magnetic head 3 by a height d (about 80 nm). 60 nm), and is separated from the surface of the magnetic recording medium 15.

[0005]

As described above, in the conventional structure, the front gap 10 floats above the surface of the magnetic recording medium 15 of the floating magnetic head 3 due to the contraction of the resin 4 flowing into the back gap 11. Height d above the surface
However, there is a problem in that the head void loss increases, and the head recording performance deteriorates and the reproduction output decreases, resulting in deterioration of the head electromagnetic conversion characteristics.

The present invention solves the above-mentioned conventional problems. The front gap of the joint surface between the A block and the B block is not recessed from the air bearing surface of the floating magnetic head, and the head air gap loss is not increased. An object of the present invention is to provide a floating magnetic head in which head electromagnetic conversion characteristics such as deterioration of recording ability and reduction of reproduction output are not deteriorated.

[0007]

To achieve this object, the floating magnetic head of the present invention is used in an in-line type HGA in which the mounting surfaces of the gimbals of the A block and the B block are on the same plane. In order to prevent the joining resin from flowing in, a small step corresponding to the thickness of the joining resin of the B block and the gimbal is provided on the attachment surface of the gimbal of the B block at a predetermined distance from the back gap.

[0008]

In this structure, the resin such as the thermosetting epoxy resin does not flow into the back gap located on the joint surface between the A block and the B block.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 showing an embodiment of the present invention, the same parts as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIGS. 1 and 2, the feature of this embodiment is that the A block 1 and the B block 2 are based on the distance L from the back gap 11 to the center of the pivot 12 of the gimbal 6. In order to prevent the resin 4 such as thermosetting epoxy resin from flowing into the back gap 11 located on the joint surface of the B block 2, the width dimension ω and the depth are set in the B block 2 starting from the position of the distance 1 from the back gap 11. This is because the minute step 14 of h is formed.

However, l is smaller than the radius r of the pivot 12, the depth h is 50 μm or less, and the width ω is L + a /
2-l or more.

As shown in FIG. 3, the resin 4 is attached only to the area of the minute step 14 and the gimbal 6 is adhered and fixed to the B block 2, and the back located at the joint surface of the A block 1 and the B block 2 is fixed. Since the resin 4 does not flow into the gap 11, even if a bending moment in the direction indicated by the arrow M ′ is generated due to the contraction of the resin 4, the bending moment is much smaller than the conventional bending moment, and the floating magnetic head has a bending moment. The phenomenon that the wound A block 1 is recessed from the air bearing surface does not occur. The amount of the resin 4 attached to the area of the minute step 14 of the B block 2 is such that the cross-sectional area X of the resin 4 after adhesion is ω × h ≦ X <with respect to the sectional area (ω × h) of the minute step 14.
ω × h × 1.05 is set to be the optimum amount in the relational expression.

By comparing the flatness data of the air bearing surface of the floating magnetic head of this embodiment after the floating magnetic head 3 is attached to the gimbal 6 with the flatness data of the air bearing surface of the conventional floating magnetic head. This is shown in FIGS. 6 and 7.

As is apparent from FIGS. 6 and 7, the change amount d of the front gap 10 of the floating magnetic head according to the present embodiment is 0 nm, and the A block 1 wound by the floating magnetic head 3 with a bending moment is used. It can be seen that there is no force to dent from the air bearing surface.

As described above, according to this embodiment, by providing the B block 2 with the minute step 14 having the predetermined size to which the resin 4 for joining the B block 2 and the gimbal 6 is attached,
Since the resin 4 does not flow into the back gap 11, even if a bending moment is generated due to the contraction of the resin 4, it is smaller than the conventional bending moment, and the bending moment causes the floating magnetic head 3 to wind the A block 1. Is not depressed from the air bearing surface, and the front gap 10 located at the joint surface between the A block 1 and the B block 2 is not depressed from the air bearing surface of the floating magnetic head 3.

Therefore, the front gap 10 is not separated from the surface of the magnetic recording medium 15 by more than the set flying height, and the magnetic conversion characteristics such as the deterioration of the head magnetic ability and the reduction of the reproducing output are caused by the increase of the head air gap loss. You can avoid it.

[0018]

As is clear from the above description of the embodiments, in the present invention, in the in-line type HGA in which the gimbal mounting surfaces of the A block and the B block are on the same plane, the resin does not flow into the back gap. Like B
The front gap should be recessed from the air bearing surface of the floating magnetic head by providing a minute step corresponding to the thickness of the resin for joining the B block and the gimbal on the mounting surface of the gimbal of the block at a predetermined distance from the back gap. Since the head air gap loss does not increase, it is possible to realize an excellent floating magnetic head in which the head electromagnetic conversion characteristics such as deterioration of head recording ability and reduction of reproduction output are not deteriorated.

[Brief description of drawings]

FIG. 1 is a schematic side view showing the concept of a floating magnetic head according to an embodiment of the present invention.

FIG. 2 is a schematic perspective view of the floating magnetic head.

FIG. 3 is a schematic side view showing a resin adhesion state when the gimbal of the floating magnetic head is joined to the B block.

FIG. 4 is a schematic side view showing the concept of a conventional floating magnetic head.

FIG. 5 is a schematic perspective view of the floating magnetic head.

FIG. 6 is a characteristic diagram showing flatness of an air bearing surface of a floating magnetic head according to an embodiment of the present invention.

FIG. 7 is a characteristic diagram showing flatness of an air bearing surface of a conventional floating magnetic head.

[Explanation of symbols]

 1 A block (magnetic circuit component) 2 B block (slider) 4 Resin 6 Gimbal 11 Back gap 14 Micro step

Claims (1)

[Claims] 1. A floating magnetic head in which a magnetic circuit component having a read / write coil wound thereon and a slider having an air bearing surface for obtaining a levitation force are adhered and fixed with a bonding glass. The mounting surface of the gimbal of the circuit component and the mounting surface of the gimbal of the slider are on the same plane, and the longitudinal centerline of the gimbal that influences the floating posture of the floating magnetic head is the floating magnetic head. In the in-line type head gimbal assay, which is positioned parallel to the longitudinal centerline (imaginary centerline connecting the head air inflow end and the air outflow end), a predetermined distance from the back gap to the mounting surface of the slider gimbal A floating magnetic head with a minute step corresponding to the thickness of the adhesive resin at the position.