JPS5994280A - Tight closure type magnetic disk device - Google Patents

Abstract

PURPOSE:To obtain an economical tight closure magnetic disk device with which the assembling work is simple by providing at least three coupling members which support an auxiliary base board at a prescribed position to a main base board and a positioning device which mounts a write/read magnetic head for information to a magnetic disk. CONSTITUTION:A magnetic disk device is assembled in the following procedure. That is, a magnetic disk 56 and a space ring 57 are stacked alternately on a magnetic disk mounting surface of a spindle hub 58. Then a rotary shaft 46 which is fixed with a screw via a cover plate 59 is supported rotatably by a base plate 42 via a bearing 48. The upper end of the shaft 46 is fitted into a bearing 50 and supported by a sub-base 60, and this base 60 is fixed to a coupling rod 62 to assemble a spindle. Such a spindle is mounted to a servo track writing device (STW device), and finally the spindle and a positioner are sealed up by a cover 44 to complete the assembly of a magnetic disk device.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealed magnetic disk device having a structure in which a rotating shaft on which a magnetic disk is mounted and a positioning device on which a magnetic head is mounted are sealed with a cover and a substrate, and in particular, the present invention relates to a sealed magnetic disk device having a structure in which a rotating shaft on which a magnetic disk is mounted and a positioning device on which a magnetic head is mounted are sealed with a cover and a substrate. The present invention relates to a sealed magnetic disk device having a rotating shaft supported at both ends.

In recent years, as the recording density of magnetic disk devices has increased, in order to minimize positional errors in writing and reading due to whirling vibrations when the magnetic disk rotates, the rotating axis C magnetic disk on which the magnetic disk is mounted usually has a rotating axis. A so-called rotary shaft support type device has been adopted in which both ends of the rotary shafts (which are mounted and fixed at regular intervals on a spindle hub that is integrated with the rotary shaft) are supported by bearings. There is.

In a conventional magnetic disk device that supports both ends of a rotating shaft, as shown in FIG. is supported by a bearing 10 attached to the cover 4, and the cover 4 is connected to the base plate 2.
It has a configuration in which both ends of the rotating shaft 6 are fixedly supported by being fixed to.

Therefore, when assembling a magnetic disk device with such a configuration, (1) servo track writing work (hereinafter referred to as STW) for writing positioning information to the servo surface, and (2)
Positioning device 14 (writing information on the magnetic disk 12)
Since the sealing cover 4 cannot be used because the sealing cover 4 cannot be used to incorporate the device that carries the magnetic head 16 that performs reading and performs its positioning operation (hereinafter referred to as a body), the above-mentioned After performing the above work using a temporary cover for assembly (hereinafter referred to as a dummy cover) that leaves the space necessary for the work open, the dummy cover is replaced with a sealing cover to complete the assembly. Procedures are required. Therefore, conventional magnetic disk drives have the disadvantage that assembly work is complicated and requires a large number of man-hours.

In order to deal with the above-mentioned disadvantages, in conventional magnetic disk devices that use large-diameter magnetic disks, the sealing cover and the part that holds the bearing 30 are removed, as shown in FIG. Main cover with 2
The rotating shaft 26 is held by the main cover 24 and the pace plate 22 (to which a bearing 28 is attached), and the sub cover 25 is removed. There is a structure in which the above-mentioned STW and positioning device are incorporated, but such a structure cannot be applied when the diameter of the magnetic disk is small. (If the bearing holding part of the main cover is made large enough to ensure strength, the volume of the sub cover will become smaller, making it impossible to secure enough free space to carry out the above-mentioned operations.) SUMMARY OF THE INVENTION It is an object of the present invention to provide a sealed magnetic disk device that is easy to assemble and is therefore economical, mainly for small magnetic disk devices, except for the above-mentioned drawbacks.

A sealed magnetic disk device of the present invention includes: a rotating shaft having a spindle hub on which a plurality of magnetic disks are stacked and mounted; a main board having a first bearing supporting the vicinity of one end of the rotating shaft; an auxiliary board having a second bearing that supports the vicinity of the other end of the rotating shaft; at least three connecting members that support the auxiliary board at a predetermined position with respect to the main board; Write information/
and a positioning device mounting a magnetic head for reading, and the rotary shaft, the auxiliary board, and the positioning device are sealed by a cover and the main board.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIGS. 3(a) and 3(b) are a plan view and a cross-sectional view taken along the line C--C showing one embodiment of the present invention, particularly showing a state in which the sealing cover is removed.

As shown in the figure, the rotating shaft 46 is supported near its lower end by a bearing 48 attached to the pace plate 42, while its upper end is supported by a bearing 50 attached to a sub-board 60 (hereinafter referred to as sub-base). It has a support structure at both ends.

5- The magnetic disks 52 and the space ring 57 are assembled by being alternately stacked on the magnetic disk mounting surface 58a of the spindle hub 58 that is integrated with the rotating shaft 46, and the cover plate 59 is placed on the top and the screws are mounted. These are tightened and fixed, and are integrated with the rotating shaft 46, so the spindle motor 64 requires a minimum of three. ) 62, supports the rotating shaft 46 by a bearing 50, and maintains a constant free space between it and the pace plate 42.

On the other hand, a body 54 equipped with a magnetic head 56 for writing and reading information to and from the magnetic disk 52 is mounted on the base plate 42, and these rotating shafts 46 (including the magnetic disk 52) are attached to the sub-base. 60. The positioner 54 (including the magnetic head 56) has a structure that is sealed by a cover 44 and a pace plate 42.

When assembling the magnetic disk device configured as described above, the magnetic disks 56 and space rings 57 are alternately stacked on the magnetic disk mounting surface of the spindle hub 58, and screws are tightened through the cover plate 59. A fixed rotating shaft 46 is connected to the base plate 42 by a bearing 48.
The upper end of the rotating shaft 46 is rotatably supported by a bearing 50.
Fitted into the sub-base 60 and supported on the sub-base 60
Assemble the spindle by fixing it to the connecting rod 62.

In this state, the four sides sandwiched between the base plate 42 and the sub space 60 are free spaces, except for the part where the connecting rod 62 is located.

In order to perform 8TW work in the above state, this is mounted on a servo track writing device (STW device) K.

(Since the STW work is normally done using the magnetic head that comes with the 8TW device, at this stage, the magnetic disk drive body is not installed as it will get in the way of the 8TW work.) Once the 8TW work is completed, the assembly described above will be carried out. The internal magnetic disk device is removed from the 8TW device, the stand 54 is mounted and fixed in a predetermined position on the base plate 42, and finally the spindle and positioner are sealed with the cover 44 to complete the assembly.

Therefore, by using a magnetic disk device having the configuration of the present invention, unlike conventional magnetic disk devices, the work of using a dummy cover to perform STW work or installing a positioner, and then replacing the dummy cover with the original cover is eliminated. Since this is not necessary, the assembly work is simple and an easy-to-use sealed magnetic disk device can be obtained.

[Brief explanation of drawings]

FIGS. 1(a) and (b) are a plan view and an A-A sectional view of an example of a conventional sealed magnetic disk device, and FIG. 2(a)
3(a) and (b) are a plan view and a BB sectional view of another example of a conventional sealed magnetic disk device, and FIGS.
) is a plan view and a sectional view taken along the line C-C of an embodiment of the present invention. In the figure, 2...base plate, 4...cover, 6...rotating shaft, 8.10...bearing,
12...Magnetic disk, 14...Positioner, 1611°°Magnetic head 1'18...
Spindle hub, 22...Base plate, 2
4...°...°Main cover, 25...Secondary cover,
26...Rotating shaft, 28.30...Bearing, 42...Base plate, 44...
Cover, 46... Rotating shaft, 48.50...
...bearing, 52, old...magnetic head, 54...
Positioner, 56... To magnetic, C, 57...
...Space ring, 58...°° spindle hub, 59°゛°°°cover plate, 60...
Sub-base, 62...Connecting rod, 64...
・Spindle motor. 9-1 (a) (6) Figure 1

Claims (1)

[Claims] A spindle hub on which a plurality of magnetic disks are stacked and mounted; a main board having a first bearing that supports the vicinity of one end of the rotation shaft; and a main board that supports the vicinity of the other end of the rotation shaft. an auxiliary board having a supporting second bearing;
A sealing device comprising at least a positioning device that supports the auxiliary board at a predetermined position with respect to the main board, and the rotary shaft, the auxiliary board, and the positioning device are hermetically sealed by a cover and the main board. type magnetic disk device.