JPH05210901A - Magnetic recording medium disk device - Google Patents

Abstract

PURPOSE:To reduce the extent of off-track by relaxing the deformation for clamping of magnetic recording medium disks and preventing the disks from coming into contact with the other parts too much to prevent dust from being raised at the time of building-in with respect to magnetic recording medium disks and the laminated structure of spacer rings for assembling of them. CONSTITUTION:Steps of magnetic recording medium disks 9 whose thickness on inner peripheral sides 9a is thicker than that on outer peripheral sides 9b and steps of stepped spacer rings 8 whose thickness on inner peripheral sides is thinner than that on outer peripheral sides are used for positioning to assemble the disks 9 like a lamination. At the time of assembling, thick parts 9a on inner peripheral sides of stepped magnetic recording medium disks 9 are pressed by a clamp ring 3 to fix the structure body of this invention. Outside parts of stepped magnetic recording medium disks 9 and stepped spindle hubs do not come into contact with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording medium disk device, and more particularly to a laminated structure of a magnetic recording medium disk and a spacer ring.

[0002]

2. Description of the Related Art A laminated structure of a conventional magnetic recording medium disk device will be described with reference to the sectional view of FIG. Figure 3
As shown in FIG. 3, a magnetic recording medium disk 1 and a spacer ring 2 attached to a spindle hub 4 of a spindle motor, a magnetic head 5 for recording / reproducing, an arm 6 for holding the magnetic head 5, and a carriage 7 for positioning the magnetic head 5. And a base plate 8 for sealing these elements. The positioning device for the magnetic head 5 in the magnetic recording medium disk device has a servo head dedicated to positioning, and this servo head reads the positioning information previously recorded on the magnetic recording medium disk surface,
Positioning control is performed based on the read information. Therefore, the relative positional error between the servo head and other data heads and the relative displacement amount between the servo disk and the data disk in which the positioning information is written are the deviation amount from the track that should be pursued as it is, that is, the off-track amount. The smaller the size, the higher the positioning accuracy. However, in reality,
Various other factors may cause an unacceptable amount of off-track. Among the off-track amount, the off-track caused by the temperature rise of the device or the change of the environmental temperature is called a thermal off-track, and the linear expansion coefficient between various mechanical parts constituting the magnetic recording medium disk device is Differences are believed to be the main factor. For this reason, recent magnetic recording medium disk devices have been devised to facilitate cooling and heat dissipation due to wind generated when the spindle rotates.

[0003]

In this conventional magnetic recording medium disk device, the magnetic recording medium disk is deformed by tightening by the clamp ring, which adversely affects the flying height between the magnetic recording medium disk and the magnetic head, and causes a head crash. There is a problem in that the amount of off-track increases. Further, since the magnetic recording medium disk is directly fitted in the spindle hub, thermal expansion of the spindle hub due to temperature rise of the device or environment directly affects the magnetic recording medium disk, and as a result, contact between the spindle hub and the magnetic recording medium disk. There is a problem that the state of thermal expansion and thermal strain of the magnetic recording medium disk at each location changes depending on the method. This phenomenon has caused a problem that the thermal off-track becomes larger.

An object of the present invention is to provide a magnetic recording medium disk device which solves the above problems.

[0005]

According to the present invention, a plurality of magnetic recording medium disks are stacked via a spacer ring, clamped and held by a clamp ring, rotated integrally with a spindle hub, and rotated by a magnetic head. In a magnetic recording medium disk device for reading and writing data, the inner peripheral side of the magnetic recording medium disk is thicker than the outer peripheral side, and the thicker inner peripheral side is thinner on the inner peripheral side of the stepped spacer ring. It is characterized in that the spindle hub and the outer peripheral side of the magnetic recording medium disk are arranged so as not to come into direct contact with each other by being pressed by a section.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the magnetic recording medium disk device of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an assembled state of a magnetic recording medium disk device according to an embodiment of the present invention. Similarly, FIG. 2 is an exploded explanatory view of the embodiment of the present invention shown in FIG.

First, in FIG. 2, the shoulder 10 of the stepped spindle hub 10 is formed thinner on the outer peripheral side 10 'than on the inner peripheral side 10 ". Next, the inner peripheral side 8'is thinner than the outer peripheral side 8". The stepped spacer ring 8 thus formed is assembled as shown in FIG. 2 so that the step is used for positioning. Similarly, the magnetic recording medium disk 9 in which the thickness of the inner peripheral side 9a is made thicker than that of the outer peripheral side 9b is assembled by using the step difference for positioning to form a laminated state. Then, the thick portion 9a on the inner peripheral side of the stepped magnetic recording medium disk 9 is pressed and fixed by the clamp ring 3 to form an assembly whose cross section is shown in FIG.

As described above, by adopting the stacking structure shown in FIG. 1, it is possible to eliminate dust generated when the spacer ring 2 and the magnetic recording medium disk 1 are incorporated in the spindle hub 4 of the conventional example whose cross section is shown in FIG. You can Further, it is possible to eliminate an adverse effect such as thermal strain exerted on the magnetic recording medium disk 1 by the thermal expansion due to the temperature rise of the spindle hub 4.

Further, in the embodiment of the present invention, by pressing the clamp ring 3 of the stepped magnetic recording medium disk 9 by means of forming the pressing position 9a portion of the stepped magnetic recording medium disk 9 thick by the clamp ring 3. Various amounts of deformation can be reduced.

[0010]

As described above, according to the present invention, the thickness of the clamp ring pressing position of the magnetic recording medium disk is formed to be thick so that the distortion such as the warp due to the clamp of the magnetic recording medium disk is alleviated and the spindle. By preventing the outer peripheral surface of the hub from coming into direct contact with the magnetic recording medium disk and the spacer ring, there is an effect of preventing dust generation during assembly. Further, it has an effect of alleviating variations in thermal expansion in the radial direction of the magnetic recording medium disk and distortion caused thereby.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a magnetic recording medium disk device of the present invention.

FIG. 2 is an exploded view of the magnetic recording medium disk device of the embodiment of the present invention shown in FIG.

FIG. 3 is a cross-sectional view showing a conventional magnetic recording medium disk device.

[Explanation of symbols]

 3 Clamp ring 8 Stepped spacer ring 9 Stepped magnetic recording medium disk 10 Stepped spindle hub

Claims (1)

[Claims] 1. A magnetic recording medium in which a plurality of magnetic recording medium disks are stacked via a spacer ring, clamped and held by a clamp ring, rotated together with a spindle hub, and data is read and written by a magnetic head. In the recording medium disc device, the inner peripheral side of the magnetic recording medium disc is made thicker than the outer peripheral side, and the thicker inner peripheral side is pressed by the stepped spacer ring inner peripheral side thin portion, and the spindle hub A magnetic recording medium disk device, wherein the magnetic recording medium disk and the outer peripheral side thereof are arranged without being in direct contact with each other.