JPH07201111A - Disk device - Google Patents

Abstract

PURPOSE:To make a disk device small and thin by providing a stationary part and a rotary part provided with a fitting surface for fitting a disk on the side opposite to this stationary part on a rotating means. CONSTITUTION:A magnetic 6 for driving a motor is attracted to a hub 5, and an inner circumferential part of a pressing spring 3 is held in a prescribed position by a part of an attracting surface 11 of the magnetic 6. The outer circumferential part of the pressing spring 3 is held in a bending state by the surface of the disk 1. Thus, the disk 1 is fitted to the disk fitting surface 2 provided on the side opposite to a bracket 8 of the hub 5. In such constitution, since a bearings space is not utilized for holding the pressing spring 3, it is advantageous to miniaturize a bearing part, and since a fixing screw is not protruded out of the side opposite to the bracket 8, it is advantageous to make the device thin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device such as a magnetic disk device, and more particularly to a disk device which has an improved disk holding mechanism and can be made compact and thin.

[0002]

2. Description of the Related Art A disk holding mechanism in a conventional magnetic disk device will be described with reference to FIG. As shown in FIG. 3, in this type of magnetic disk device, a bracket 8 that is a stationary portion is provided with a hub 5 that is a rotating portion via a bearing 7. A plurality of (for example, three) setscrews 4 are used on the circumference of the hub 5 centered on the central axis 10 to fix the disk 1 on the hub 5 via a pressing spring 3. A coil 9 is arranged on the bracket 8, and a magnet 6 is provided on the hub 5 so as to face the coil 9. The magnet 6 and the coil 9 constitute an electric motor.

The mounting surface 2 for mounting the disk 1 on the hub 5 is provided on the surface of the hub 5 opposite to the bracket 8. Further, the pressing spring 3 is attached to the hub 5 with the set screw 4, and the pressing spring 3 presses the inner peripheral portion of the disk 1 against the disk mounting surface 2 so that the disk 1 is fixed to the hub 5. There is.

In such a structure, the set screw 4 is arranged on the magnet 6, the coil 9, the bearing 7, the hub 5 or the like which form the electric motor, which is disadvantageous in reducing the thickness of the device.
Further, in order to lower the position of the set screw, the set screw 4 is conventionally arranged on the central shaft 10, but this hinders the size reduction of the bearing, which is not preferable from the viewpoint of size reduction of the device.

Further, as described above, since the disk 1 is fixed on the hub 5 via the pressing spring 3 using the plurality of setscrews 4, the disk 1 has a petal-like shape with its radial direction as a node. Undulating deformation may occur. Therefore, there is a possibility that a spacing variation between the recording / reproducing head (not shown) and the disk 1 may occur. This hinders lowering of the flying height of the recording / reproducing head, and hinders improvement of recording density.

[0006]

As described above,
In the conventional disc device, the pressing spring is fixed to the hub with a set screw, and the disc is attached by pressing it against the disc mounting surface provided on the side opposite to the bracket of the hub. Hinders

Therefore, an object of the present invention is to provide a disk device which can be made compact and thin.

[0008]

In order to achieve the above object, in the present invention, a disc which is an information recording medium, a rotating means for holding the disc rotatably, and a recording / reproducing of information on the disc. In a disk device having a recording / reproducing head for performing the above, the rotating means includes a stationary portion,
And a rotating portion provided with a mounting surface for mounting the disc on the side facing the stationary portion.

[0009]

According to the above-mentioned structure, as in the conventional case,
Compared to the structure in which the disc is attached to the rotating part via the holding spring with the set screw, the upper part of the rotating part is not used as the mounting space of the member, that is, the set screw does not project on the upper surface of the hub as in the past and the bearing space Since it does not incur any damage, it is advantageous for downsizing and thinning.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to FIGS. The disk device of this embodiment is
As shown in FIG. 1, a bracket 8 as a stationary portion is provided with a hub 5 as a rotating portion via a bearing 7. The disc 1 is fixed to the surface of the hub 5 facing the bracket 8 via a pressing spring 3. A coil 9 is arranged on the bracket 8, and a magnet 6 is provided on the hub 5 so as to face the coil 9. These magnet 6 and coil 9
Constitutes an electric motor.

FIG. 2 shows the mounting relationship between the hub 5, the presser spring 3, and the disk 1. The hub 5 is provided with a recess 5a which functions as a clearance groove on the disk mounting surface thereof, and also on the magnet mounting surface. A recess 5a that functions as a groove is formed. Further, the pressing spring 3 is composed of outer peripheral portions 3a and 3b, a cylindrical portion 3c, and an inner peripheral portion 3d, and the outer peripheral portions 3a and 3b are formed with a flange portion 3a and a pressing portion 3b.

In this embodiment, a magnet 6 for driving an electric motor is attracted to the hub 5 by a magnet attractive force,
The inner peripheral portion 3d of the pressing spring 3 is held at a predetermined position by a part of the attraction surface 11 of the magnet 6. The outer peripheral portions 3a and 3b of the pressing spring 3 are held on the surface of the disc 1 in a bent state. In this case, the pressing force generated by the bending of the collar portion 3a is applied to the disc 1 via the pressing portion 3b, so that the inner peripheral portion of the disc 1 is held against the hub 5.

As described above, the disc 1 is attached to the disc mounting surface 2 provided on the side of the hub 5 facing the bracket 8. In such a configuration, since the bearing space is not used for holding the pressing spring 3, it is advantageous for downsizing the bearing portion, and since the set screw does not project to the side opposite to the bracket 8 of the hub 5, it is advantageous for thinning. Is.

Since the attractive force of the magnet 6 is used,
Another advantage is that it does not require screwing work. Further, as in the conventional case, the central shaft 1 is mounted on the hub 5.
Since the disk 1 is not fixed on the hub 5 via the pressing spring 3 by using a plurality of three setscrews 4 on the circumference centered on 0, the petals having nodes in the radial direction of the disk 1 are used. Wavy deformation is less likely to occur, variation in spacing between the recording / reproducing head (not shown) and the disk 1 can be prevented, and the recording density can be improved.

The present invention is not limited to the above-described embodiments, but can be implemented with various modifications without departing from the scope of the present invention.

[0016]

As described above, according to the present invention, the upper portion of the rotating portion is attached to the member as compared with the conventional configuration in which the disc is attached to the rotating portion via the pressing spring with the set screw. Since it is not used as a space, it is possible to provide a disk device that is advantageous for downsizing and thinning.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a disk device according to an embodiment of the present invention.

FIG. 2 is a view showing a mounting relationship between a hub, a presser spring, and a disk in the same embodiment.

FIG. 3 is a schematic sectional view showing an example of a conventional disk device.

[Explanation of symbols]

 1 ... Disc 2 ... Disc mounting surface 3 ... Presser spring 5 ... Hub 6 ... Magnet 7 ... Bearing 8 ... Bracket 9 ... Coil 11 ... Magnet attraction surface

Claims (1)

[Claims] 1. A disk device comprising a disk which is an information recording medium, a rotating means for holding the disk rotatably, and a recording / reproducing head for recording and reproducing information on the disk, wherein the rotating means comprises: A disk device comprising: a stationary part; and a rotating part having a mounting surface for mounting the disk on a side facing the stationary part.