JPS61170973A - Sealing-type magnetic disk device - Google Patents

Abstract

PURPOSE:To avoid unnecessary an assembly preliminary means from being adapted and to complete assembly work easily in a short time by setting a housing to a divided body composed of a part and another part which supports rotatably both end parts of a spindle. CONSTITUTION:Plural magnetic disks 16 are piled up on a disk carrying surface in the hub part 13a of the spindle 13, and its lower end is rotatably supported at the prescribed position of a lower base cover 10 through a bearing 14. Then, when a bearing 15 is inserted into the upper end of the spindle 13 to joint an upper base cover 100 to the lower one 10, the upper and lower ends of the spindle 13 are supported by the upper and lower bese covers 10 and 11 rotatably and pivotaly. Then a positioner 19 for including a magnetic head 18 is inserted into the interior through the side openings of the upper and lower base covers 10 and 11 and assembled at the prescribed position on the lower base cover 10. Afterthe positioner 19 is assmebled, a closing cover 12 is fitted at the side openings of the upper and lower base covers 10 and 11.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealed magnetic disk device in which a spindle for carrying a magnetic disk and a positioner for positioning a magnetic head are each sealed with a housing, and more particularly, The present invention relates to a sealed magnetic disk device including a both-end supported spindle in which both ends of the spindle are supported by bearings.

Prior Art 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 spindle that carries the magnetic disk (magnetic disks are usually stacked at regular intervals on a spindle hub that is integrated with the spindle) Increasingly, devices with a so-called spindle both-end supported type structure, in which both ends of the spindle (mounted and fixed) are supported by bearings, are being adopted.

In a conventional magnetic disk device with a spindle supported at both ends, as shown in FIG. 1, the lower part of the rotating spindle 1 is supported by a bearing attached to a base plate 2 forming a housing, and the upper part is supported by a bearing 5 attached to the housing cover 4, and has a structure in which both ends of the spindle 1 are fixedly supported by finally fixing the housing cover 4 to the base plate 2.

When assembling a magnetic disk device with such a configuration, a magnetic head is used to perform servo track writing work (hereinafter referred to as STW) for writing positioning information on the servo surface, and to write and read information to and from the magnetic disk 6. The housing cover 4 cannot be installed from the initial stage of assembly due to the installation work of the positioner 8 that carries the spindle 7 and performs its positioning operation. It is necessary to provide some kind of assembly aid.

As an auxiliary means for temporarily supporting the upper end of the spindle 1, a temporary assembly cover (not shown) is used which has enough space to incorporate the above-mentioned members and has a structure that can temporarily support the upper end of the spindle 1. Then, this temporary assembly cover is replaced with a new one to complete the assembly work.

Because such a work procedure is required, conventional magnetic disk drives have the disadvantage of having to undergo a complicated assembly process.

OBJECT OF THE INVENTION The present invention has been made in order to solve the problems of the conventional device, and it is possible to easily and quickly perform STW work and positioner assembly work without using extra assembly aids. The purpose of the present invention is to provide a sealed magnetic disk device that can be assembled quickly.

Structure of the Invention In order to achieve the above object, in the sealed magnetic disk device of the present invention, the nozzing is made into a divided body of one side and the other side that rotatably supports each end of the spindle. A base cover having an opening wide enough to insert a positioning device including a magnetic disk from the side orthogonal to the spindle when both the divided bodies are combined, and The structure consists of a closure cover that seals the area.

Embodiment Hereinafter, a sealed magnetic disk device which is an embodiment of the present invention will be described with reference to FIG. 2(a), Φ).

The housing has one lower base cover 10 and the other upper base cover 11 which are divided into two parts, upper and lower, and when combined, both base covers 10 and 11 are open on the sides. The structure is such that the interior is sealed by attaching a closing cover 12 to the opening formed by both base covers 10 and 11.

The lower end of the spindle 13 is rotatably supported on a bearing 14 provided on the lower base cover 10 side, and the upper end is rotatably supported on a bearing 15 provided on the upper base cover 11 side. A plurality of magnetic disks 16 are supported in a stacked manner at regular intervals on the hub portion 13a of the spindle 13, and the spindle 13 is rotated by the rotational drive of a spindle motor 17, and the closing cover 12 is attached to the upper and lower bases. When the covers 10 and 11 are removed, a portion of the plurality of magnetic disks 16 mounted on the spindle 13 is exposed to the outside from the side openings of both base covers 10 and 11. .

On the other hand, a positioner 19, which supports a magnetic head 18 for writing or reading information on the magnetic disk 16 and positions it at a predetermined position, has the lower base cover 10 as its mounting base.

Next, the manner of assembling the above-described embodiment device will be described.

A plurality of magnetic disks 16 are stacked on the disk supporting surface of the hub portion 13a of the spindle 13, and the lower end of the spindle 13 is rotatably supported at a predetermined position of the lower base cover 10 via a bearing 14. Next, the bearing 15 is fitted into the upper end of the spindle 13 and the upper base cover 11 is joined to the lower base cup <-10. As described above, at this assembly stage, a portion of the magnetic disk 16 is exposed to the outside of the cover.

ST for the magnetic disk 16 set in this way.
In order to perform W, the magnetic disk device that is currently being assembled is connected to the STW device. When the predetermined STW is completed, the process moves to the next assembly process of the magnetic disk device.

That is, the positioner 19 including the magnetic head 18 is inserted into the side openings of the upper and lower base covers 10 and 11 and assembled at a predetermined position on the lower base cover 10.

As a final assembly step after assembling the positioner 19, a sealed nozzle is formed by attaching the closing cover 12 to the side openings of the upper and lower base covers 10 and 11.

In this way, the upper and lower ends of the spindle 13 are reliably positioned by the upper and lower base covers 10 and 11 from the initial stage of assembly, and there is no correlation with the positioner 19 when assembling the nozzle.

Effects of the Invention As can be understood from the above, according to the sealed magnetic disk device of the present invention, the magnetic disk system mechanism and the magnetic head can be easily connected to each other without using another auxiliary member such as a conventional cover for temporary assembly. Since the housing structure allows the system mechanism to be assembled independently, the time spent on attaching and detaching the temporary assembly cover is omitted, and efficient assembly work is possible.

[Brief explanation of drawings]

Figures 1(a) and 1(b) are the assembled plan view of the conventional device and A
FIGS. 2(a) and 2(b) are an assembled plan view of a sealed magnetic disk device according to an embodiment of the present invention, and a longitudinal sectional view taken along line B-B. Explanation of symbols of main parts 10, 11...Pair of upper and lower base covers 12...
Blocking cover "3-, xey""(fli1'"@) J13a...
Spindle nope part 16...Magnetic disk 18...Magnetic head 19...Positioner (positioning device) Fig. 1(b) Fig. 2(Q) (b)

Claims (1)

[Claims] A sealed magnetic disk device in which information is written to or read from a magnetic disk mounted on a spindle and rotated inside a sealed housing using a magnetic head carried by a positioning device, wherein the housing is mounted on a spindle and rotates. The positioning device including the magnetic disk is inserted into the spindle from a direction perpendicular to the spindle with one and the other divided bodies rotatably supporting each of the two end portions. 1. A sealed magnetic disk device comprising: a base cover having an opening large enough to cover the base cover; and a closing cover that closes the opening of the base cover to seal the inside.