JPS63868A - Head positioning mechanism - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] The head positioning mechanism of the present invention has a configuration in which a ceramic ring is further provided on the outer ring of the ball bearing that supports the carriage to which the head/socket is attached. This reduces the amount of dust generated from the parts.

[Industrial application field]

The present invention relates to a mechanism for determining the head position of a magnetic disk device, and more particularly to an improvement in a ball bearing that supports a head carriage.

In recent years, the flying height of heads in magnetic disk drives has been decreasing more and more, and as a countermeasure against head crashes, it is therefore required to reduce dust generated within disk enclosures.

[Conventional technology]

A conventional moving coil type head positioning mechanism is shown in FIGS. 3 and 4. In this figure, 11 is a head arm supporting a magnetic head 12, 13 is a carriage 7 on which this head arm and a moving coil 14 are mounted, and inclined guide portions are formed on the upper and lower surfaces of both sides thereof. Further, reference numeral 15 denotes permanent magnets that are arranged opposite to each other so as to sandwich the movable coil.

Reference numeral 16 denotes a ball bearing installed in the fixed guide section 17 so as to sandwich the inclined guide section of the carriage.

The head positioning operation generates a linear driving force for the carriage 13 by exciting the movable coil 14 and forming a magnetic circuit between it and the permanent magnet 15. The carriage 13 moves at high speed in the radial direction of the magnetic disk (not shown) by this driving force, and moves the head 1 to a desired track.
Position 2. At this time, the ball bearing 16 smoothly guides the movement.

[Problem that the invention seeks to solve]

In the conventional head positioning mechanism, since the carriage is supported by stainless steel ball bearings, a portion of them is worn out due to sliding between the inclined guide part of the carriage and the outer ring of the ball bearing during high-speed movement. . This abrasion powder scatters and adheres to the recording surface of the magnetic disk, causing a problem of head crash. Another drawback is that the life of the carriage guide mechanism is short. Note that this problem similarly occurs in a linear positioning mechanism in which a ball bearing is provided on the carriage side.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional situation, it is an object of the present invention to provide a head positioning mechanism equipped with a ball bearing, in which the guide portion and ball bearing of the carriage are less likely to be worn out even when the carriage moves at high speed.

[Means for solving problems]

In order to achieve the above object, the present invention includes a ceramic import 2 on the outside of the outer ring 211 of the ball bearing 21, as shown in FIG.
2 is covered.

[Effect]

The ceramic bearing 22 provided on the outside of the outer ring 211 of the ball bearing 21 has high wear resistance, so when the carriage moves at high speed, the wear caused by sliding on the contact surface is significantly reduced.
Therefore, the generation of dust can be significantly reduced.

〔Example〕

FIG. 2 is a sectional view showing an embodiment of the present invention. As is clear from this figure, the conventional structure shown in Fig. 4 is different from the ball bearing 2.
Only 1 is different, and therefore other components are designated by the same reference numerals and detailed description thereof will be omitted.

In the ball bearing 21, which is a feature of this embodiment, a ring 22 made of alumina, which is a type of ceramic, is fitted on the outside of an outer ring 211. Therefore, in this embodiment, the ring 22 of the ball bearing 21 comes into contact with the inclined guide portion of the carriage 13. Since this alumina ring 22 has good wear resistance, there is little wear even when the carriage 13 comes into contact with the inclined guide portion when it moves at high speed, and as a result, very little wear powder is generated.

In order to further enhance this wear-resistant effect, the surface of the alumina ring 22 may be formed into a lubricating surface by utilizing the porosity of alumina itself and impregnating the pores with a lubricant. Furthermore, it is desirable to reduce the surface roughness of the surface of the alumina ring, that is, the contact surface with the inclined guide part, and to reduce the cylindricity of the ring, the load per unit contact area is reduced and from the viewpoint of wear resistance. desirable.

Although one embodiment of the present invention has been described above, the material of the ceramic ring 22 is not limited to this, and silicon nitride, silicon carbide, sialon, boron nitride, titanium nitride, and titanium carbide can be used.

〔Effect of the invention〕

As described above, according to the present invention, wear of the guide mechanism section that guides the straight movement of the carriage during the high speed movement can be significantly reduced, and a carriage guide mechanism with a long life can be obtained. Further, since the amount of dust generated therefrom is greatly reduced, the occurrence of head crashes can be reduced, and a highly reliable magnetic disk device can be obtained.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the basic configuration of the present invention, FIG. 2 is a sectional view showing an embodiment of the invention, and FIGS. 3 and 4 are a perspective view and a sectional view showing a conventional head positioning mechanism. . 1 and 2, 13 is a carriage, 14 is a moving coil, 15 is a permanent magnet, 17 is an identification guide, 21 is a ball bearing, 22 is a ceramic ring, and 211 is an outer ring of a ball bearing. Tsuzuruaki's Jade Axis Sword I Drawing Figure 1, f-Invention/7 [Futotsuzu Drawing 2]

Claims (1)

[Claims] A mechanism for moving and positioning a magnetic head attached to a carriage in a straight line to a desired track on a magnetic disk, comprising a ball bearing (13) that guides the straight movement of the carriage (13).
21) A head positioning mechanism characterized in that a ceramic ring (22) is provided on the outside of the outer ring.