JPH05114262A - Levitating magnetic head - Google Patents

Abstract

PURPOSE:To prevent the protrusion of a C-type core of a magnetic head with a winding wire from a levitating surface when a magnetic head slider and gimbal are stuck to each other. CONSTITUTION:The fitting surface of the magnetic head sticking section of a magnetic head slider 25 to which a gimbal 26 is stuck is flat and, at the time of constituting this floating magnetic head, a first resin layer 27 of a thermosetting type resin is put between the fitting surface and gimbal 26. A second resin layer 28 having an area which is 172 or larger of that of the first layer 27 is formed on the rear surface of the gimbal 26 opposite to its fitting surface by using the same resin by an amount which is 1/2 to 3/4 of the resin amount of the layer 27. Therefore, this levitating magnetic head can perform stable operations without deteriorating its electromagnetic conversion characteristic, because the protrusion of its C-type core from the levitating surface and damages of magnetic media are eliminated and the gap of the magnetic head is not damaged.

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 for a fixed magnetic disk device used for recording and reproducing data in a computer or the like.

[0002]

2. Description of the Related Art Recently, fixed magnetic disk devices have been made smaller and thinner, and accordingly, the floating magnetic heads have been significantly thinned.

A conventional floating type magnetic head is shown in FIGS. In the figure, a magnetic head slider 5 having an air bearing surface 4 for obtaining a lift force by an air flow generated by rotation of a fixed disk is formed by bonding and fixing a gap 3 with a C-shaped core 1 and an I-shaped core 2 with a bonding glass. It A gimbal 6 is bonded to the magnetic head slider 5 with a resin 7, and a load arm 8 that gives a load that balances lift with the magnetic head slider 5 to the magnetic head slider 5 via the gimbal 6 is attached to form a floating magnetic head.

The floating attitude of the floating magnetic head is held by a gimbal 6 attached to a load arm 8. An insulating tube 12 covering the lead wire 11 of the read / write coil 10 wound around the C-shaped core 1 is fixed by forming a claw 9 on a part of the load arm 8 by cutting and raising. .. Floating magnetic head gap 3
The higher the recording density and the larger the output, the closer the magnetic recording medium 13 is to the magnetic recording medium 13.
The gap 3 of the floating magnetic head is formed at the position of the air outflow end. The minimum gap where the gap 3 of the floating magnetic head faces the magnetic recording medium 13 is determined by the shape of the slider surface, the load, and the position of the load application point.

Further, the mounting surfaces of the magnetic head joint portions of the C-shaped core 1 and the I-shaped core 2 which are joined to the gimbal 6 of the magnetic head slider 5 are flat surfaces, and the air inlet end and the air outlet end in the longitudinal direction are virtually connected. In the in-line type floating magnetic head, which is mounted parallel to the center line of the gimbal 6 in the longitudinal direction with respect to the center line of the gimbal 6 so as to be located also on the C-shaped core 1 in relation to the load point of the gimbal 6, Usually, a resin 7 such as a thermosetting epoxy resin is interposed and bonded to the mounting surfaces of the joint portion of the magnetic head and the joint portion of the gimbal 6. At this time, the gimbal 6 shrinks in the direction of the arrow 14 of the resin 7 such as thermosetting epoxy resin or the like.
The bending moment in the direction of the arrow 15 acts on the C, and the stress in the direction of the arrow 16 acts on the C-shaped core 1 against the bending moment in the direction of the arrow 15 to generate a strain of about 100 nm.

[0006]

As described above, in the above-mentioned in-line type floating magnetic head, the gimbal 6 is used.
When the resin is adhered and fixed with a resin 7 such as a thermosetting epoxy resin interposed, a bending moment in the direction of arrow 15 is generated in the gimbal 6 due to the contraction of the resin 7 in the direction of arrow 14, and the gimbal 6
There is a problem in that the C-shaped core 1 of the magnetic head slider 5 is stressed in the direction of the arrow 16 due to this deformation, causing distortion in the C-shaped core 1 and protruding from the air bearing surface 4.
Further, when the floating magnetic head in this state is repeatedly contacted / started / stopped for a long time, the magnetic recording medium 13 is damaged and the recorded information is destroyed, and the air bearing surface side of the C-shaped core 1 is also damaged. There is a problem that the gap 3 of the floating magnetic head located at the position is damaged and the electromagnetic conversion characteristics are deteriorated.

[0007]

[Means for Solving the Problems] A first resin layer made of resin is provided between the gimbal and the magnetic head joint to bond them, and the magnetic head joint of the gimbal is opposite to the side where the magnetic head is attached. On the side, a second resin layer having the same composition as the former is provided.

[0008]

According to the present invention, the bending moment exerted on the gimbal of the resin in which the gimbal is adhered and fixed to the floating magnetic head having the above-mentioned structure cancels each other due to the contraction of the resin on both sides of the gimbal, and the bending moment does not occur. The influence of stress on the shaped core is reduced, and the protrusion from the air bearing surface can be eliminated.

[0009]

Embodiments of the present invention will be described below with reference to FIGS. In the figure, a gap 23 is bonded and fixed by a bonding glass with a C-shaped core 21 and an I-shaped core 22 to form a magnetic circuit, and an air bearing surface 24 for obtaining a lift force by an air flow generated by rotation of a fixed disk is provided. The magnetic head slider 25 is formed such that the magnetic head bonding portion to the gimbal 26 is in the same plane. A first resin layer 27 made of a thermosetting epoxy resin is provided between the magnetic head slider 25 and the gimbal 26 to bond and fix the magnetic head slider 25 and the gimbal 26. A second resin layer 28 made of the same thermosetting epoxy resin is provided on the side opposite to the side of the gimbal 26 where the magnetic head is attached to the magnetic head.

An insulating tube in which a load arm 29 is attached to and bonded to the gimbal 26, a claw 30 is formed on a part of the load arm 29 by cutting and raising, and a C-shaped core 21 covers a read / write coil 31 and a lead wire 32. Fix 33. The flying posture of the floating magnetic head is such that a load that balances the lift force is applied to the magnetic head slider 25 via the gimbal 26.
And is held by the gimbal 26 attached to the load arm 29 to form a floating magnetic head.

FIG. 3 shows the relationship between the amount of resin in the second resin layer 28 and the protrusion of the C-shaped core 21 due to the deformation of the gimbal 26 in the area of the resin layer 28 with respect to the first resin layer 27. In the figure, by changing the resin amount of the second resin layer 28, a bending moment in the direction of arrow 36 acts on the gimbal 26, the gimbal 26 changes, and stress in the direction of arrow 37 acts on the C-shaped core 21 and the C-shaped core 21. The protrusion of 21 changes. Note that this relationship is also related to the area of the second resin layer 28, and this relationship is established in an area that is 1/2 or more of the area of the first resin layer 27, but in the area of 1/3, the gimbal 26 On the other hand, the C-shaped core 21 projects from the air bearing surface 24 with less resin contraction and bending moment.
Further, even if the area is ½ or more, when the resin amount of the second resin layer 28 is less than ½ of the resin amount of the first resin layer 27, the C-shaped core 21 projects from the air bearing surface 24.

Therefore, it is 1/2 with respect to the first resin layer 27.
The state where the C-shaped core 21 is recessed from the air bearing surface 24 is shown by increasing the resin amount of the second resin layer 28 to more than 1/2 in the above area. On the other hand, the second resin layer 27
When the resin amount of the resin layer 28 is equal to or more than that, the recess of the C-shaped core 21 from the air bearing surface 24 becomes as large as -10 nm or more, and the spacing loss of the gap 23 of the floating magnetic head becomes larger when the resin amount is more than that. The number increases, which leads to deterioration of electromagnetic conversion characteristics. The bending moment in the direction of arrow 36 with respect to the gimbal 26 also leads to the adhesive strength between the gimbal 26 and the magnetic head slider 25, and the smaller the bending moment in the direction of arrow 36, the higher the adhesive strength.

As described above, on the side opposite to the side where the magnetic head is attached to the magnetic head joining portion of the gimbal 26, the same thermosetting type as the resin layer 27 is used with an area of 1/2 or more of the first resin layer 27. By providing the second resin layer 28 having a resin amount of 1/2 to 3/4, which is an epoxy resin, the resins on both surfaces of the gimbal 26 both shrink in the direction of the arrow 35 and cancel each other out. No bending moment is generated in the direction of arrow 36. Therefore, the bending moment of the gimbal 36 does not influence the stress on the C-shaped core 21 in the direction of arrow 37, the C-shaped core 21 does not project from the air bearing surface 24 of the floating magnetic head slider, and contact start for a long time is started. Even after the stop operation is repeated, the magnetic recording medium 34 is not damaged and the gap 23 of the floating magnetic head is not damaged, so that stable operation can be performed without deterioration of electromagnetic conversion characteristics.

[0014]

As described above, according to the present invention, on the opposite side of the first resin layer to which the magnetic head of the gimbal is attached, the same thermosetting type is used in an area of 1/2 or more with respect to the first resin layer. By providing the second resin layer with a resin amount of 1/2 to 3/4, which is an epoxy resin, no bending moment is generated in the gimbal. Therefore, the stress on the C-shaped core is reduced, the C-shaped core does not protrude from the air bearing surface of the magnetic head slider, the magnetic recording medium is not damaged, and the gap of the floating magnetic head is not damaged. It is possible to realize an excellent floating magnetic head capable of stable operation without deterioration.

[Brief description of drawings]

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

FIG. 2 is a perspective view of a floating magnetic head according to an embodiment of the present invention.

FIG. 3 shows the relationship between the area of the resin layer and the protrusion of the resin amount in the example of the invention.

FIG. 4 is a side view of a conventional floating magnetic head.

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

[Explanation of symbols]

 1 C-shaped core 2 I-shaped core 3 Gap 4 Air bearing surface 5 Magnetic head slider 6 Gimbal 7 Resin 8 Load arm 9 Claw 10 Read / write coil 11 Lead wire 12 Insulation tube 13 Magnetic recording medium 14 Arrow 15 Arrow 16 Arrow 21 C-shaped core 22 I-shaped core 23 Gap 24 Air bearing surface 25 Magnetic head slider 26 Gimbal 27 Resin layer 28 Resin layer 29 Load arm 30 Claw 31 Read / write coil 32 Lead wire 33 Insulation tube 34 Magnetic recording medium 35 Arrow 36 Arrow 37 Arrow

Claims (3)

[Claims] 1. A floating magnetic head in which a magnetic head is attached to a load arm via a gimbal, wherein a first resin layer is provided between a magnetic head joint portion of the gimbal and the magnetic head, and the magnetic head joint is provided. A floating magnetic head, wherein a second resin layer is provided on the side opposite to the side where the magnetic head is attached. 2. A floating magnetic head according to claim 1, wherein a thermosetting epoxy resin is used as a resin layer. 3. A second resin with respect to the resin amount of the first resin layer in an area that is 1/2 or more of the first resin layer on the back surface of the portion of the gimbal magnetic head bonding portion which is in contact with the resin. 3. The resin amount of the layer is set to 1/2 to 3/4.
The floating magnetic head described.