JPH03256280A - Magnetic head supporting mechanism for magnetic disk device - Google Patents

Abstract

PURPOSE:To keep the attitude angle of a head slider constant, and in addition, to facilitate the removal of an adhesive agent remaining on an arm by making the mean roughness of the center line of the bonding surface of a spacer rougher than the mean roughness of the center line of the bonding surface of the load arm. CONSTITUTION:After the spacer 1, the load arm 3 and a gimbal 2 are spot- welded, they are grinding-worked so as to remove warp caused on the spacer 1 and the arm 3. At that time, the mean roughness of the center line of the bonding surface of the spacer 1 is made rougher than the mean roughness of the center line of the bonding surface of the arm 3. Then, when a head assembly is fixed to the tip part 6 of the arm, a whole head never comes to be inclined because the spacer 1 is fixed. Further, the attitude angle of the head slider 4 at the time when the magnetic head floats on the surface of a magnetic disk 10 does not change. Besides, the adhesive agent adheres much to the surface of rough surface ruoghness, and most of it remains at the spacer 1, and the removing work of the residual adhesive agent of the surface of the tip part 6 becomes easy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head support mechanism for a magnetic disk drive. The head assembly is composed of an arm and a spacer, and the spacer and gimbal are spot welded to the load arm, and the l\rad lidar is glued to the gimbal. Furthermore, the head slider is supported on the surface of the magnetic disk by screwing, caulking, or gluing the spacer of the head assembly to the tip of the arm of the carriage, thereby positioning the head slider at an arbitrary radial position on the magnetic disk.

[Issues that the investigation seeks to solve]

In the above-mentioned magnetic disk drive, the centerline average roughness of the spacer surface is generally about 0.4 μmRa, and the centerline average roughness of the arm surface is generally about 1.6 μmRa. However, by welding the spacer to the load arm, the entire spacer is warped, and the amount of warpage is about 15 μ at the center of the spacer and the end face of the spacer. When the head assembly is fixed to the arm, this warpage causes the entire head assembly to tilt due to the spacer fixing method, and the attitude angle of the Herad slider when the magnetic head floats above the magnetic disk surface is It will change depending on the method. In addition, when the head assembly is attached to an arm, especially in an integrated carriage where multiple arms are integrally molded by die-casting, when replacing the magnetic head,
Separate the adhesive part between the spacer and arm and glue the new magnetic head. In this case, when the adhesive portion is peeled off, most of the adhesive remains on the arm, and it takes time and effort to remove this residual adhesive.

An object of the present invention is to prevent the head slider attitude angle from changing by the spacer fixing method described above, and to reduce the amount of adhesive remaining on the arm.

[Means to solve the problem]

In order to achieve the above object, a spacer and a gimbal are spot-welded to a load arm, and the surface of the spacer is ground to remove warpage caused by the spot-welding. After the above grinding process, the head slider is bonded to the gimbal to form a head assembly.

By bonding the head assembly to the tip of the arm of the carriage, the head slider is supported on the surface of the magnetic disk, and the head slider is positioned at an arbitrary radial position on the magnetic disk. At this time, the centerline average roughness of the spacer surface after grinding is configured to be rougher than the centerline average roughness of the spacer bonding surface at the tip of the arm of the gear ridge.

[Effect]

By the grinding process, warpage caused by spot welding that occurs in conventional spacers can be removed.

As a result, when the head assembly is fixed to the arm, the spacer fixing method does not cause the entire head assembly to tilt, and the magnetic head is fixed to the surface of the magnetic disk.
The attitude angle of the Herad slider when it floats does not change due to the spacer fixing method described above.

Further, when the adhesive portion between the spacer and the arm is peeled off during the magnetic head replacement operation, the adhesive clings to the rough surface. For this reason, for example, the center line average roughness of the spacer surface can be reduced to 3.2 μmRa to 6.3 μm by the grinding process.
Ra, the center line average roughness of the tip of the carriage arm is 1.
By making the centerline average roughness of the spacer surface rougher, such as 6μmRa or less, most of the adhesive remains on the spacer, making it easier to remove residual adhesive from the arm surface. be.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. A head assembly is constructed by spot welding a spacer 1 and a gimbal 2 to a load arm 3, and gluing a head slider 4 to the gimbal 2. A head actuator is constructed by gluing the head assembly to the arm tip 6 of the carriage 5, attaching the coil 7 and bearing 8 to the carriage 5 (=J), and further attaching the circuit board 9.

The magnetic disk 10 is stacked on a spindle motor 11, and the spindle motor 11 is fixed to a base 12. Further, a shaft 13 is provided on the base 12, and the RAD actuator As5y is supported by the shaft 13. By driving the Rad actuator forward by the magnet 14 fixed to the base 12 and the magnetic coil 7, the Rad slider 4 is moved to an arbitrary radial position of the magnetic disk 10 rotated by the spindle motor 11.
position. The carriage 5 has a plurality of arms 1
5, and is integrally molded by die casting.

In the magnetic disk drive having the above configuration, the surface of the spacer 1 is ground after the spacer 1, load arm 3, and gimbal 2 are spot welded to remove warpage caused by spot welding of the spacer 1 and load arm 3, and For example, the line average roughness is 3.2μmRa to 6.3μ+
++Ra. Further, the center line average roughness of the arm tip of the carriage 5 is set to, for example, 1.6 μmRa or less. As a result, when fixing the head assembly to the arm tip 6,
The method of fixing the spacer 1 prevents the entire head 5ub-assy from being tilted, and the attitude angle of the Herad slider 4 when the magnetic head flies above the surface of the magnetic disk 10 does not change due to the method of fixing the spacer 1. Furthermore, when the adhesive between the spacer 1 and the arm tip 6 is peeled off during magnetic head replacement work, the adhesive clings to the rough surface, so most of the adhesive remains on the spacer 1 and the arm tip 6. It is possible to facilitate the removal of residual adhesive on the surface.

〔Effect of the invention〕

As explained above, the present invention includes spot welding a spacer, a load arm, and a gimbal, and then grinding the spacer surface to remove warping of the spacer caused by spot welding the spacer and load arm. Since the center line average roughness is configured to be rougher than the center line average roughness of the spacer adhesive surface at the end of the arm of the gear ridge, the following effects are achieved.

When fixing the head assembly to the arm, the spacer fixing method prevents the entire head assembly from tilting due to warpage of the spacer, and the attitude angle of the Herad slider when the magnetic head floats above the magnetic disk surface is the same as that of the spacer. It will not change depending on the fixing method. Furthermore, when replacing the magnetic head, when the adhesive part between the spacer and the arm is peeled off, the adhesive sticks to the rough surface, so most of the adhesive remains on the spacer, and the residual adhesive on the arm surface It is possible to facilitate the removal work.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a magnetic disk device according to the present invention, FIG. 2 is a diagram showing a head support mechanism of a magnetic disk device according to the present invention, and FIG. 3 is a diagram showing a head support mechanism of a conventional magnetic disk device. be. 1... Spacer, 2... Gimbal, 3... Load arm, 4... Slider, 5... Carriage, 6...
・Arm tip, 7...coil, 8...bearing,
9... Circuit board, 10... Magnetic disk, 11...
・Spindle motor, 12...Base, 13...Shaft, 14...Magnet, 15...Arm.

Claims (1)

[Claims] 1. A magnetic head support mechanism for a magnetic disk device in which a magnetic head is fixed to a load arm via a gimbal, and the load arm is adhesively fixed to the head arm via a spacer member, wherein the spacer is bonded. A magnetic head support mechanism for a magnetic disk drive, characterized in that the centerline average roughness of the surface is rougher than the centerline average roughness of the adhesive surface of the load arm.