JPH04324155A - Spindle hub for magnetic disk device - Google Patents

Abstract

PURPOSE:To reduce the occurrence of a head crush by making the friction coefficient small when a magnetic disk medium and a disk spacer are built-in a spindle hub and then making a trace amount at the worn particles generating when the magnetic medium and the disk spacer are built-in the spindle spacer. CONSTITUTION:On the surface of the spindle hub, a Ni alloy coated film 12 and a fluorine type oil coating film 13 are formed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle hub for a magnetic disk drive, and more particularly to a spindle hub for a sealed magnetic disk drive.

0002

2. Description of the Related Art FIG. 3 is a plan view and a sectional view showing an example of a spindle hub of a conventional magnetic disk drive, in which (a) is a plan view and (b) is a sectional view taken along the line Y--Y.

[0003] A drive shaft that rotates a spindle hub on which magnetic disk media for recording information are stacked and mounted;
an access drive unit that moves a magnetic head that writes and reads information to and from the magnetic disk medium; the drive shaft and the access drive unit are mounted on a predetermined position on a base plate; A conventional spindle hub of a so-called sealed magnetic disk device, which is sealed by a conventional spindle hub, has a configuration as shown in FIG.

Specifically, an aluminum alloy material is formed into a predetermined shape as shown in FIG. 3, its surface is polished, and then washed to remove contaminants to form the spindle hub 31. , has a structure in which the aluminum alloy is exposed.

[0005]

[Problems to be Solved by the Invention] Conventional spindle hubs as described above have unstable oxides on the surface where the aluminum alloy is exposed and have a large coefficient of friction. When incorporating into
A large amount of abrasion powder is generated due to contact between the outer circumference of the spindle hub and the inner circumference of the magnetic disk medium. Abrasion powder generated during the process of assembling the magnetic disk medium and the spindle hub adheres between the surface of the magnetic disk medium and the core of the magnetic head. It has the disadvantage of causing scratches and so-called head crashes.

[0006]

[Means for Solving the Problems] A spindle hub of a magnetic disk device of the present invention includes a drive shaft that rotates a spindle hub on which magnetic disk media for recording information are stacked and mounted, and a drive shaft that rotates a spindle hub on which magnetic disk media for recording information are mounted. an access drive unit that moves a magnetic head for writing and reading information, the drive shaft and the access drive unit being mounted on a predetermined position on a base plate and sealed with a cover. This spindle hub has a nickel alloy coating and a fluorine oil coating formed on its surface.

[0007]

Embodiments Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view and a sectional view showing an embodiment of the present invention, (a) is a plan view, (b) is a sectional view taken along the line X-X, and FIG. 2 is a state in which the embodiment of FIG. 1 is used. FIG.

In FIG. 1, an aluminum alloy member 11
1 is formed by machining an aluminum alloy material into a predetermined shape as shown in FIG. This aluminum alloy member 11 is subjected to pretreatment of zinc substitution,
A 2 μm thick nickel alloy film 12 is formed by electroless nickel plating. By immersing this in a perfluoropolyether solution, a fluorine-based oil film 13 is formed thereon.

The spindle hub constructed in this way is used as shown in FIG. That is, by inserting the magnetic disk medium 23 into the spindle hub 21 and mounting the disk spacer 22 thereon, and repeating this process, a plurality of magnetic disk media 23 and a plurality of disk spacers 22 are alternately inserted. Stack. Magnetic disk medium 23
When inserting the disk spacer 22 into the spindle hub 21, since the surface of the outer circumference of the spindle hub 21 is coated with the fluorine oil coating 13, the coefficient of friction between the magnetic disk medium 23 and the inner circumference of the disk spacer 22 is reduced. Because they are small, only a small amount of abrasion powder is generated when they come into contact.

[0011]

As explained above, the spindle hub of the magnetic disk device of the present invention incorporates the magnetic disk medium and the disk spacer into the spindle hub by forming a nickel alloy coating and a fluorine oil coating on the surface. This has the effect of reducing the coefficient of friction during assembly, thereby minimizing the amount of abrasion powder generated when the magnetic disk medium and disk spacer are assembled into the spindle hub. Therefore, the occurrence of head crashes can be reduced.

[Brief explanation of drawings]

FIG. 1 is a plan view and a cross-sectional view showing an embodiment of the present invention, in which (a) is a plan view and (b) is a cross-sectional view taken along the line X-X.

FIG. 2 is a cross-sectional view showing the embodiment of FIG. 1 in use.

FIG. 3 is a plan view and a sectional view showing an example of a spindle hub of a conventional magnetic disk device, in which (a) is a plan view and (b)
) is a sectional view taken along YY line.

[Explanation of symbols]

11 Aluminum alloy member 12 Nickel alloy coating 13 Fluorine oil film 21 Spindle hub 22 Disc spacer 23 Magnetic disk media 31 Spindle hub

Claims (1)

[Claims] 1. An access drive that moves a drive shaft that rotates a spindle hub on which a stack of magnetic disk media for recording information is mounted, and a magnetic head that writes and reads information to and from the magnetic disk medium. A spindle hub for a sealed magnetic disk device, the spindle hub having a drive shaft and an access drive unit mounted on a predetermined position on a base plate and sealed by a cover,
A spindle hub for a magnetic disk device, characterized in that a nickel alloy coating and a fluorine-based oil coating are formed on the surface.