JPH02134780A - Disk lamination structure - Google Patents

Abstract

PURPOSE:To realize a disk lamination structure in which position accuracy of a disk is easily obtained by providing a hub with a nearly cylindrical shape with a guard comprising a cylinder and a flange and forming at least the cylinder of the hub with a single layer. CONSTITUTION:An upper hub 24 consists of a cylinder 24a formed by a single layer and a flange 24b prolonged radially from the side face of the cylinder 24a. Then a disk 25 is fitted to the flange 24b by using an adhesives. Then the cylinder 24a of the upper hub 24 and a spacer 27 are presses in a direction of a projection 21b of a spindle 21 by tightening a nut 31 to position the disk 25. Even when the nut 31 is strongly tightened, the pressing force by the nut 31 is not delivered only the cylinder 24a of the upper hub 24 and the spacer 27 and not delivered to the disk 25, then the disk is not destroyed. Thus, no adhesive layer is interposed to the laminate part of the hub 24 and the spacer 27 and a lower hub 26 is independently of the positioning accuracy, then the positioning accuracy is improved.

Description

[Detailed description of the invention] [A spindle rotationally driven by a 11W commuter, a plurality of hubs that fit on the spindle and have disks attached to them, and a cylindrical spacer that fits on the spindle and performs positioning between the hubs. and a pressing means for pressing a hub and a spacer against a protrusion provided on a spindle. , a substantially flanged cylindrical hub consisting of a cylindrical part that fits into the spindle and is pressed by a pressing means, and a flange part that extends radially from the side surface of the cylindrical part and to which a disk is attached using adhesive. At least the cylindrical portion of the hub is configured to be formed of a single layer.

[Industrial Application Field] The present invention comprises a spindle rotationally driven by a motor;
a plurality of hubs that fit into the spindle and to which disks are attached; a cylindrical spacer that fits into the spindle and performs positioning between the hubs; and a protrusion provided on the spindle that connects the hubs and the spacers. The present invention relates to a laminated disk structure comprising a pressing means for pressing the disk.

In recent years, with the development of electronic computer systems, magnetic and optical disk devices have been used as external storage devices for stably storing large amounts of information. Methods for increasing the storage capacity of this disk device include increasing the storage density and stacking disks. When stacking disks, it is desired to hold the disks stably and to have good positional accuracy of the disks.

[Prior Art] Next, a conventional example will be explained using the drawings. FIG. 5 is a configuration diagram illustrating a conventional example.

In the figure, 1 is a spindle rotationally driven by a motor (not shown). One end of this spindle 1 is provided with a male threaded portion 1a, and the other end is provided with a protrusion 1b.

Reference numeral 2 designates an upper hub having a groove 2a carved in the vicinity of the circumference, and 3 a lower hub having a groove 3a carved in the vicinity of the circumference.

Adhesive is applied to opposing surfaces of the plurality of upper hubs 2 and lower hubs 3, and these are integrally laminated.

Furthermore, a plurality of discs 4 are attached to the space formed by the grooves 2a and 3a of the upper hub 2 and lower hub 3 using adhesive (in the figure, the parts to which the adhesive is applied are indicated by thick lines). ).

5 is a cylindrical spacer for positioning the hubs 2 and 3. Reference numeral 6 denotes a pressing member that fits into the male threaded portion 1a of the spindle 1 and can come into contact with the upper hub 2 at the upper end. 7 is a nut that is screwed into the male threaded portion 1a.

In such a stacked disk structure, by tightening the nut 7, the upper hub 2, lower hub 3, and spacer 5 are pressed toward the protrusion 1b of the spindle 1 via the pressing member 6, and are positioned.

[Problems to be Solved by the Invention]- In the conventional example with the above configuration, if the nut 7 is tightened too strongly, excessive stress is also applied to the disc 4, causing the disc 4 to
There is a problem with the damage.

This is particularly a problem when the base of an optical disc is made of a fragile material such as glass.

Further, since the adhesive is also applied to the contact surface A between the upper hub 2 and the lower hub 3, the thickness of the adhesive layer increases as it goes upward. Furthermore, since there are many parts to be pressed, dimensional errors of each part are added up, resulting in a problem that the positional accuracy of the disk (for example, the dimensions in the drawings) is not good.

The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a disk stacked structure that prevents damage to the disks and facilitates achieving accurate disk positioning.

[Means for Solving the Problems] FIG. 1 is a diagram showing the principle of the present invention. In the figure, 11 is a spindle that is rotationally driven by a motor and is provided with a protrusion 11a, 12 is a spindle that is fitted into the spindle 11, and has a disk 1.
3 are the plurality of hubs to which they are attached. 14 is a cylindrical spacer that fits into the spindle 11 and performs positioning between the hubs 12; 15 is a pressing means that presses the hub 12 and the spacer 14 against a protrusion 11a provided on the spindle 11;

The hub 12 has a cylindrical portion 12a that fits onto the spindle 11 and is pressed by the pressing means 15, and a flange portion 12b that extends in the radial direction from the side surface of the cylindrical portion 12a and to which the disk 13 is attached using adhesive. At least the cylindrical portion 12a of the hub 12 has a cylindrical shape with a flange.
is made of a single layer.

[Function] In the disk stacked structure shown in FIG.
The disk 13 is positioned by pressing the cylindrical portion 12a of the hub 12 and the spacer 14.

[Example] Next, an example of the present invention will be described using the drawings. Second
3 is an enlarged view of the hub in FIG. 2, and FIG. 4 is a diagram illustrating another embodiment of the present invention.

First, in FIGS. 2 and 3, 21 is a spindle that is rotationally driven by a motor (not shown). One end of this spindle 21 is provided with a male threaded portion 21a, and the other end is provided with protrusions 2], b. 22 and 23 are bearing units that rotatably support both ends of the spindle 21. 24 is an upper hub that fits into the spindle 21.

This upper hub 24 has a cylindrical portion 24a formed of a single layer.
and a flange portion 24b extending radially from the side surface of the cylindrical portion 24a.

A disk 25 is attached to the flange 24b using adhesive. The area to which this adhesive is applied is the range S1 in FIG.

Reference numeral 26 denotes a lower hub to which an adhesive is applied in a region S2 and attached to the upper hub 24, an adhesive is also applied in a region S3, and a disk 25 is attached. 27 is a cylindrical spacer for positioning the upper hub 24. 28
A first holding member is fitted into the male threaded portion 21a of the spindle 21, and two are second holding members which are fitted into the cylinder 21 and can come into contact with the cylindrical portion 24a of the upper hub 24 at the upper end. 30 has one end attached to the first holding member 28 and the other end attached to the second holding member 28.
This is a disc spring that comes into contact with the two holding members.

31 is a nut screwed into the male threaded portion 21a.

By tightening the nut 31, the cylindrical portion 24a of the upper hub 24 and the spacer 27 are pressed in the direction of the protrusion 21b of the spindle 21, so that the disc 25
positioning is performed.

According to the above configuration, even if the nut 31 is strongly tightened, the pressing force from the nut 31 is transmitted only to the cylindrical portion 24a of the upper hub 24 and the spacer 27, and is not applied to the disk 25, so that the disk 25 is not damaged.

Further, since there is no adhesive layer in the laminated portion of the upper hub 24 and the spacer 27, which are parts related to the positioning accuracy of the disk 25, and the lower hub 26 has no relation to the positioning accuracy of the disk, Compared to the example, the number of parts is reduced and positioning accuracy is improved.

Note that the present invention is not limited to the above embodiments.

For example, the shape of the hub may be shaped like a hub 41 shown in FIG. In this figure, 41a is a cylindrical portion to which a pressing force is applied, and 42b is a flange portion to which an adhesive is applied in a region S4 and to which the disk 25 is attached.

[Effects of the Invention] As explained above, according to the present invention, there is a cylindrical portion that fits onto the spindle and is pressed by the pressing means, and a disk that extends in the radial direction from the side surface of the cylindrical portion and is attached using an adhesive. A substantially cylindrical hub with a flange is provided, and at least the cylindrical portion of the hub is formed of a layer, which prevents damage to the disk and improves the positioning accuracy of the disk. A simple disk stacking structure can be realized.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the principle of the present invention, Figure 2 is a diagram explaining one embodiment of the invention, Figure 3 is an enlarged view of the hub in Figure 2, and Figure 4 is a diagram explaining another embodiment. , FIG. 5 is a configuration diagram illustrating a conventional example. 1 to 4, 1.1.21 is a spindle, 11a, 21a are protrusions, 12.41 is a hub, 12a, 24a, 41a are cylinder parts, 12b, 24b, 41b are flange parts, 13.25 is a disk, 14.27 is a spacer 24 is an upper hub, and 26 is a lower hub. Figure 2: Principle diagram of the present invention Figure 2: Diagram explaining an embodiment of the present invention

Claims (1)

[Scope of Claims] A spindle (11) rotationally driven by a motor, a plurality of hubs (12) fitted into the spindle (11) and to which disks (13) are attached, and the spindle (1).
A cylindrical spacer (14) that fits into the hub (1) and positions the hub (12); and a protrusion (14) provided on the spindle (11) that connects the hub (12) and the spacer (14) 11a); a cylindrical portion (12a) that fits onto the spindle (11) and is pressed by the pressing means (15); and the cylindrical portion (12a). a substantially flanged cylindrical hub (12) consisting of a flange portion (12b) extending radially from a side surface of the hub and to which the disk (13) is attached using an adhesive; The disk laminated structure is characterized in that the cylindrical portion (12a) is formed of a single layer.