JPS5830314Y2 - Information disk attachment structure - Google Patents

Description

[Detailed explanation of the invention] This invention is an information recording/reproducing disk (hereinafter referred to as a disk).

) in a disk rotation device, and particularly relates to a structure of a mounting portion suitable for a disk whose base body is made of a material that is easily distorted such as glass or plastic.

Figure 1 is a half plan view showing an example of the conventional technology, and Figure 2 is a
It is a cross-sectional view.

The disk 1 is held between a lower flange 2 and an upper flange 3.

To explain in more detail, the lower flange 2 includes a shaft portion 2a that fits into the center hole 1a of the disk 1.
A cushioning material 5 is placed on the lower surface of the holder.

Note that the lower flange 2 is provided with a positioning hole 2b concentric with the shaft portion 2a.

Further, the upper flange 3 fits into the shaft portion 2a and is placed on the upper surface of the disk 1 with the cushion material 5 interposed therebetween.

Furthermore, in order to fix the above-mentioned disk 1, lower flange 2, and upper flange 3 together, clamping bolts 4 are tightened, and the disk 1 is pressed against the lower flange 2 by the upper flange 3.

The cushioning material 5 mentioned above is made of, for example, a polyester film, which advantageously prevents the disk 1 made of a fragile material such as glass from cracking.

Further, when tightening the clamping bolts 4, since the disk 1 is easily distorted, a torque driver or the like is used to apply uniform tightening pressure, and each bolt 4 is tightened with the same torque.

Disc 1 and flange 2 assembled as described above
, 3 to a disk rotation device, the positioning hole 2b of the lower flange 2 is fitted into the spindle 6 of the disk rotation device, and the disk rotation device is placed on the turntable 7.

Then, it is screwed to the turntable 1 using fixing bolts 8.

In this state, the electric motor 9 rotates the disk once.

Note that when tightening the fixing bolt 8, it goes without saying that the torque is constant.

The disadvantage of this conventional method is that after the plurality of clamping ports 4 are tightened with uniform torque, the plurality of fixing bolts 8 are further tightened, so the number of bolts applied to the disk 1 increases, and it is inevitable that Torque imbalance is likely to occur, resulting in non-uniform distortion in the disk 1.

Further, when tightening the fixing bolt 8, if the fixing bolt 8 is tightened with a torque stronger than that of the clamping bolt 4, the tightening pressure of the clamping bolt 4 will be weaker, and the unbalance of the tightening pressure will become even greater.

In this way, if uneven distortion occurs inside the disk 1, high speed rotation, such as 1800 to 3600 R
When rotated at the rotational speed of the PM, the stress due to the above-mentioned distortion and the stress due to centrifugal force are superimposed, and if the base of the disk 1 is made of glass or the like, it becomes extremely susceptible to breakage, which is extremely dangerous. .

Even more inconveniently, the fastening bolt 8 cannot be tightened to a pressure higher than the pressure determined by the material of the disc 1.

That is, since the fixing bolt 8 fixes the disc 1 and the flange 2°3 to the turntable 7, even if you try to tighten it firmly to withstand high-speed rotation, the disc 1 will be like glass. Due to the material, the tightening pressure is limited and it is impossible to tighten even more firmly.

This idea was made in order to eliminate the drawbacks of the conventional ones as mentioned above, and it was designed to create a structure for the disc mounting part that can be firmly fixed to the turntable without causing uneven distortion on the disc. This is what we provide.

Embodiments of this invention will be described in detail below with reference to FIGS. 3 and 4.

The lower flange 10 is disposed on the lower surface of the disk 1 via the cushioning material 5, and its shaft portion 10a fits into the center hole 1a of the disk 1.

This lower flange 10 is provided with a positioning hole 10b concentric with the shaft portion 10a.

The upper flange 11 is arranged on the upper surface of the disk 1 via the cushioning material 5, and its convex portion 11a fits into the center hole 1a of the disk 1.

At this time, in the center hole 1a, the shaft portion 10a and the convex portion 11
No contact with a.

In this arrangement, by tightening the clamping bolts 12, the disk 1, lower flange 10, and upper flange 11 are integrated.

Note that the clamping bolt 12 is tightened at a constant pressure by tightening with a constant torque using a torque driver or the like, as in the conventional case.

Disc 1 and flange 1 integrated as described above
0.11 is fitted into the spindle 6 and the positioning hole 10b of the lower flange 10, and placed on the turntable γ.

Then, it is fixed to the turntable 7 with fixing bolts 13.

Here, the upper flange 11 is provided with a through hole 14 large enough for the head of the fixing bolt 13 to pass through, and the fixing bolt 13 passes through the through hole 14 and connects the lower flange 10 and the turntable I. Fix between.

According to the embodiment described above, after the disc 1 is tightened with the clamping bolt 12, no other external force is applied, so the initially set tightening pressure is maintained, and no distortion due to another external force is applied. In addition, since the fixing bolts 13 that substantially fix the turntable 7 and the disc 1 are simply tightening the lower flange 10, the tightening of the fixing bolts 13 causes pressure to be applied to the disc 1. It has no effect on

Furthermore, since a highly rigid metal is used as the material for the flanges 10 and 11, the fixing bolt 13 can be tightened with a strong torque, so that the disk 1 can be firmly fixed.

As mentioned above, this idea allows even disks whose bases are made of easily breakable materials such as glass to be mounted on a disk rotating device without causing uneven distortion, allowing them to rotate at high speeds. There is no need to worry about damage.

Also, since the disk will be fixed to the disk rotating device via the lower flange fixed to it,
The strong tightening of the disc allows for a firm attachment without applying pressure.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half plan view showing a conventional example, and FIG. 2 is a sectional view of the same. FIG. 3 is a half plan view of one embodiment of this invention, and FIG. 4 is a sectional view of the same. In the figure, 1 is a disk, 1a is a center hole, 6 is a spindle, 7 is a turntable, 10 is a lower flange, 1
0a is a shaft portion, 10b is a positioning hole, 11 is an upper flange, 12 is a clamping bolt, 13 is a rigid bolt, and 14 is a through hole.

Claims (2)

[Scope of utility model registration request] (1) A structure in which an information disc having an information track on the base and a center hole is mounted on a disc rotating device comprising an evening table and a spindle whose tip protrudes from the turntable. A lower flange is disposed on the lower surface of the disk and includes a shaft portion that fits into the center hole of the disk and has a positioning hole concentric with the center hole; The upper flange arranged on the upper surface of the disk is clamped by bolts without contacting the shaft portion of the flange, and the lower flange is attached to the turntable with the spindle fitted in the positioning hole. an information disk positioned and disposed above the turntable, only the lower flange being fixed to the turntable by fixing bolts, and the upper flange provided with a through hole that allows the head of the fixing bolt to pass through. The structure of the attachment part. (2) A cushioning material is interposed between the lower flange and the upper flange and the disk;
A structure for mounting an information disc as set forth in claim (1) of the utility model registration.