JPH0568794B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a head disk assembly (hereinafter referred to as
The present invention relates to a device that supports an HDA in a servo track writer for writing servo data to the HDA.

[Conventional technology]

When writing a servo pattern to the magnetic disk in the HDA, the HDA servo track writer must position the HDA with high precision in both the vertical and horizontal directions on the servo track writer to ensure highly accurate writing. It is necessary.

In order to position the HDA in the vertical direction, for example, a support device having four support stands with fixed heights is provided on the servo track writer, and the HDA is placed on each support stand of the support device. ,the
Pressing the top surface of the HDA downward with a pressing means,
This method has traditionally been used.

[Problem that the invention seeks to solve]

However, if an HDA with four or more vertical positioning reference points is placed on each fixed support stand with a corresponding number of heights, the plane connecting each reference point of the HDA and each of the servo truck writers. Unless the planes connecting the support bases match perfectly, in other words, if the machining accuracy of the bottom surface of the HDA housing is poor.
The HDA is supported at only three points and the remaining support stands are floating. If the HDA is pressed from above in this state, the HDA housing will be distorted as all the supports come into close contact with each other, which will not only reduce the dimensional accuracy of the HDA but also distort the spindle axis and deteriorate the spindle rotational accuracy. In addition, if all the supports cannot be brought into close contact due to insufficient pressing force, high rigidity of HDA, or large amount of lifting, unstable support may be the cause.
The HDA vibrated on the support stand, which caused servo pattern writing accuracy to deteriorate.

This invention was made in view of the above points,
The present invention aims to provide a support device that can ensure highly accurate writing of servo patterns regardless of the processing accuracy of the HDA housing.

[Means for solving problems]

The present invention provides a support device for a head disk assembly that includes a plurality of support stands on a base that disperse and support the head disk assembly at four or more locations, including a first support member fixedly provided on the base. and a second support having a support surface on which the head disk assembly is placed, and which is slidably movable between the first support member and changes the height of the support surface by the sliding movement. a member, an elastic member that expands and contracts in response to a load applied to the support surface of the support member to determine the height of the support surface, and presses the second support member against the first support member. It is characterized in that at least one of the plurality of supports is constituted by a height-adjustable support, preferably comprising fixing means for fixing the height of the support surface.

[Effect]

When the HDA is placed on a support stand, the load of the HDA is distributed and supported by each support stand, and the height of the height-adjustable support stand is adjusted by the elastic member being compressed according to the distributed load of the HDA applied there. automatically adjusts to the optimal height. In other words, for example, there are four support stands, three of which are reference supports, and one
If the three locations are telescopic tables, the height is automatically adjusted so that the three reference supports are in close contact with each other. This results in
Regardless of the machining accuracy of the lower surface of the HDA, the HDA and each support stand come into close contact with each other, and the HDA is evenly supported by each support stand. Therefore, if the height of the height-adjustable support is fixed using a fixing means in this state, the HDA will be fixed when the magnetic disk rotates.
Since no vibration occurs, highly accurate writing of the servo pattern can be ensured.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a support device according to the present invention. This support device is installed on the stone surface plate 1 of the HDA servo truck writer.
A U-shaped stand 2 is mounted on the U-shaped stand 2, and support stands 3, 4, and 5 are installed at three of the four points corresponding to the four corners of the HDA on the U-shaped stand 2, and the remaining one point is A height-adjustable support base 6 is provided.

The supports 3, 4, and 5 are cylindrical supports with fixed heights.

As shown in FIG. 2, the height-adjustable support base 6 includes a middle cylinder 8 having a support surface 7 on the top on which the HDA is placed, a middle cylinder 8 into which the middle cylinder 8 is movably inserted in the vertical direction, and a window on the side surface. 9.
A compression spring 11 is provided inside the outer cylinder 10 to support the middle cylinder 8 within the outer cylinder 10 . In order to prevent the middle cylinder 8 from tilting, it is preferable to provide, for example, four compression springs 11 around the middle cylinder 8 at equal intervals (that is, at intervals of 90 degrees). Only two springs 11 are shown). The spring 11 is
It plays the role of changing the height of the support surface 7 (that is, the height of the support base 6) by expanding and contracting in accordance with the load applied to the support surface 7. The strength of this spring 11 is set so that it can handle approximately 1/4 of the load on the HDA so that one of the HDA loads distributed at four points can be received in a well-balanced manner at one point. It is preferable if it has a strong strength.

In the support base 6, a cylinder 13 is provided on the side of the outer cylinder 10, with the tip of a rod 12 extending laterally directed toward the window 9. By pressing the side surface of the middle cylinder 8 with the rod 12 through the window 9, the cylinder 13 is activated by friction between the rod 12 and the middle cylinder 8 and friction between the middle cylinder 8 and the outer cylinder 10. Middle cylinder 8
(i.e., fixes the height of the support surface 7 (height of the support base 6)).

The HDA support operation by this support device is shown below.
It is as follows.

With the rod 12 of the cylinder 13 separated from the side surface of the middle cylinder 8, as shown in FIG.
4 is placed on the support surfaces 7 of the support tables 3 to 5 and the support table 6. Then, in the support stand 6, the height of the support surface 7 (that is, the height of the support stand 6) decreases according to the load on the HDA 14 due to the contraction of the spring 11. As a result, regardless of the machining accuracy of the lower surface of the HDA 14, the HDA 14 and each of the support stands 3 to 6 come into close contact with each other, and the HDA 14 is evenly supported by each of the support stands 3 to 6.

Next, the cylinder 13 is driven to press the side surface of the middle cylinder 8 with the tip of the rod 12, as shown by the two-dot chain line 12' in FIG. Then, the height of the support base 6 is fixed with the HDA 14 being evenly supported as described above.

Next, in the servo track writer, the upper surface of the HDA 14 supported as described above is pressed downward by a pressing means (not shown).
Vertical positioning of HDA 14 is completed.
Thereafter, the servo track writer rotates the magnetic disk 15 in the HDA 14, and writes a servo pattern on the disk 15 using a servo head (not shown). During this rotation of the disk 15, the HDA is equally supported on each support stand 3 to 6.
Since no vibration occurs in the disk 14, it is possible to write the servo pattern on the disk 15 with high precision in this writing.

In this embodiment, as described above, the height-adjustable support has a structure including an inner cylinder and an outer cylinder, and the elastic member and fixing means are composed of a compression spring and a cylinder, respectively. The adjustable support base may be of any other suitable structure, and the elastic member and fixing means may also be comprised of other suitable members and means, respectively.

In addition, in this embodiment, four support stands are provided,
One of the supports is a height-adjustable support, but an appropriate number of two or more supports may be provided, including an appropriate number of height-adjustable supports.

Further, in this embodiment, this support device is used to position the HDA in a servo track writer, but the present invention may be used in other HDA support devices.

〔Effect of the invention〕

As described above, according to the support device according to the present invention, regardless of the processing accuracy of the HDA housing,
The HDA can be evenly supported by each support stand. Therefore, for example, this support device can be
If used to position the HDA in a servo track writer, the HDA will not vibrate on the support stand when the magnetic disk inside the HDA rotates, ensuring highly accurate writing of the servo pattern. Become.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the support device according to the present invention, in which a is a top view, b is a side view, and FIG. 2 is a detailed view of the height-adjustable support base of the support device in FIG. FIG. 3 is a top view with a part of the support surface cut away, b is a side sectional view with a part of the housing cut away, and FIG. 3 is a diagram showing the HDA supported by the support device of FIG. 1. , a is a top view, and b is a side view. 1... Stone surface plate, 2... U-shaped stand, 3, 4, 5
...Support stand, 6...Height-adjustable support stand, 7...
Support surface, 8...middle cylinder, 9...window, 10...outer cylinder,
11... Compression spring, 12... Rod, 13
...Cylinder, 14...HDA, 15...Magnetic disk.

Claims (1)

[Scope of Claims] 1. A support device for a head disk assembly comprising a plurality of support stands on a base that support the head disk assembly in four or more locations in a distributed manner, comprising: a first base fixedly provided on the base; a support member, and a support surface on which the head disk assembly is placed, and a first support member that is slidably movable between the first support member and changes the height of the support surface by the sliding movement. an elastic member that determines the height of the support surface by expanding and contracting in response to a load applied to the support surface of the support member; and an elastic member that determines the height of the support surface; and a fixing means for fixing the height of the support surface by pressing against the head disk assembly. Support device. 2. The first supporting member is a cylindrical body whose end is fixed on the base and has a window on the side surface, and the second supporting member is a cylindrical column inserted so as to be movable in the vertical direction within the cylinder. The elastic member is provided between the base and the cylindrical body in the cylindrical body, and is composed of a compression spring that supports the cylindrical body, and the fixing means is attached to the cylindrical body through the window. 2. A support device for a head disk assembly according to claim 1, characterized in that the device comprises a cylinder that presses a side surface of the head disk assembly with a rod. 3. The support device for a head disk assembly according to claim 1 or 2, which is used for positioning the head disk assembly when writing a servo pattern in a servo track writer for a head disk assembly.