JP2000100032A - Disk clamping device, disk driving device and carriable image pickup device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the detaching of a disk from a disk clamping device even when shocks or vibration is applied from the outside of a camera during its used, and to detach it from the disk clamping device by a force as small as possible during disk replacing regarding a disk clamping device for an optical disk incorporated in a camera or the like. SOLUTION: This disk clamping device is provided with a turntable 3 for placing a disk 8, and a clamper 4 for pressing the disk 8, and adapted to hold the disk 8 between the turntable 3 and the clamper 4. In this case, a locking pin 6 is provided in the turntable 3, and a pin hole 11 for fitting the locking pin 6 is formed in the clamper 4. Thus, even when torque is applied by Coriolis force during the rotation of the disk 8, a force applied from the disk 8 on the clamper 4 is suppressed by the locking pin 6, and the disk 8 is surely held in the turntable 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk clamp device for fixedly holding a disk such as a floppy disk or an optical disk on a rotating turntable, a disk drive device using the disk clamp device, and a disk drive device incorporating the disk drive device. The present invention relates to a portable imaging device.

[0002]

2. Description of the Related Art As shown in a sectional view of FIG. 5, a conventional general disk clamping apparatus has a disk fitting formed in a convex shape at the center of a turntable 53 fixed to a rotating shaft 52 of a spindle motor 51. Align the hole in the center of the disc 56 with the portion 53a and turn the disc 56 on the turntable 53.
And presses and clamps the disk 56 between the turntable 53 and the clamper 54, and the magnet 55 attached to the turntable 53 or the clamper 54.
Then, the turntable 53 and the clamper 54 are suction-coupled to each other, and the disk 56 is fixedly held. The portion of the clamper 54 or the turntable 53 that contacts the magnet 55 is made of a magnetic material.

FIG. 4 shows a camera 30 which is a portable image pickup device incorporating a disk drive device 40 using such a disk clamp device. Since the camera 30 is held by hand and the bottom portion is used on the shoulder, it is easier to take a picture if the width is smaller than the height of the camera 30. Accordingly, as shown in FIG.
The disk surface is arranged parallel to the side surface of the zero and the disk surface is perpendicular to the ground. In FIG. 5, the surface of the disk 56 is shown horizontally, but when actually used,
Generally, the disk surface is arranged vertically.

[0004]

However, when the disk drive device is used in the above-described camera, the camera 30 swings right and left following the subject at the time of photographing. Is subject to Coriolis forces. The Coriolis force will be described with reference to FIG. Although the actual disk 54 has a hole at the center, the disk will be described as a uniform disk-shaped disk in order to briefly explain the Coriolis force. FIG. 6A is a plan view of the disk surface viewed from above, and FIG. 6B is a plan view of FIG.
FIG.

As shown in FIG. 6, when the center point of the disk is the origin, the axis perpendicular to the disk surface is the X axis, and the two axes parallel to the disk surface and orthogonal to the origin are the Y axis and the Z axis, When the camera 30 is moved to follow the subject while the camera 30 is in use, and the camera 30 is used to rotate about the Y axis of the disc, the rotating disc is rotated by the Coriolis force about the Z axis. A torque Tc is generated.

In FIG. 6, R is the radius of the disk, ωc is the rotation speed at which the disk rotates around the Y axis, and ωd is the rotation speed of the disk. Here, assuming that the mass of the disk is M, the torque Tc due to the Coriolis force is expressed by the following equation. This torque is represented by the mass M of the disk, the rotational speed ωc at which the disk rotates around the Y axis, and the rotational speed of the disk. Number ωd
And proportional to the square of the disc radius.

Tc = 1/2 × (M × ωc × ωd × R2)
It acts in the direction of rising or falling off.
As described above, if the disk 56 floats or comes off the turntable 53, there is a problem that data cannot be stored on the disk 56 or data cannot be read from the disk 56.

In particular, since the disk 56 is thin and has low rigidity, it is easy to be twisted, and the disk 56 is easily lifted off the turntable 53 and easily comes off. To solve this,
It is conceivable to increase the magnetic force between the turntable 53 and the magnet 55 to counteract the torque caused by the Coriolis force. However, in this case, a large attractive force is required. When removing the clamper 54, it is necessary to move the clamper 54 against the large suction force, which causes inconvenience.

The present invention solves the above-mentioned conventional problems, and can withstand an external force or the like acting when the disk is rotating, and can easily take out the disk from the disk clamp device even when replacing the disk. An object of the present invention is to provide an excellent disk clamp device.

[0010]

According to the first aspect of the present invention,
In order to solve the above-mentioned problems, a turntable on which a disc is placed, a clamper for pressing the disc, and a magnet for attracting and coupling the turntable and the clamper are provided, and the disc is sandwiched between the turntable and the clamper. In the disk clamp device described above, a lock pin is provided on the turntable or the clamper, a pin hole is formed in the clamper or the turntable, and the lock pin fits into the pin hole. According to a second aspect of the present invention, in the disk clamp device according to the first aspect, the locking pin is formed at a tip of a rotation shaft of a motor that rotates the turntable. It is.

The inventions of claims 3 and 4 are a disk drive device using the above-mentioned disk clamp device and a portable imaging device using this disk drive device, respectively.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on one embodiment of the present invention shown in the drawings. FIG. 1 and FIG.
FIG. 1 is a simplified cross-sectional view of a disk drive device using the disk clamp device of the present invention. FIG. 1 shows a state of the clamp device when the disk rotates, and FIG. 2 shows a state of the clamp device when the disk is replaced. FIG.

As shown in FIG. 1, the disk drive device is fixed to a spindle motor 1, a rotating shaft 2 of the spindle motor 1, a turntable 3 on which a disk 8 is mounted, and a circular shape for pressing the disk 8. And a clamper 4. At the center of the turntable 3, a concentric convex portion 3a and a locking pin 6 that fit into the center hole 8a of the disk 8 are provided. In this embodiment, the locking pin 6 is formed at the tip of the rotating shaft 2 of the spindle motor 1. The annular magnet 5 penetrates the locking pin 6 and is fixed to the upper surface of the projection 3 a of the turntable 3. On the other hand, a pin hole 11 is formed at the center of the clamper 4 so that the locking pin 6 of the turntable 3 is fitted therein, and a portion of the clamper 4 which is in contact with the magnet 5 is made of a magnetic material.

The operation of the disk clamp device thus constructed will be described with reference to FIGS. When the disc 8 is mounted, the clamper 4 is lifted upward along the locking pin 6 against the attraction force of the magnet 5 and removed (second
Figure). With the clamper 4 removed, align the disc 8 with the projection 3a at the center of the turntable and turn the turntable 3
After being placed on the upper side, the clamper 4 is mounted along the locking pin 6, and the disk 8 is clamped between the turntable 3 and the clamper 4. The clamper 4 is attracted and coupled to the turntable 3 by the magnet 5 to fix and hold the disk 8 (FIG. 1).

The disk 8 fixed and held in this manner is
When the spindle motor 1 rotates, the spindle motor 1 is rotated via the rotating shaft 2 to store data on the disk 8 or
The reading of data from is performed. Here, even if the Coriolis force (torque) that causes the disk to float as described above by the photographing operation of the camera while the disk is rotating, the clamper 4 is fitted and locked to the locking pin 6 of the turntable 3. Since the clamper 4 is not tilted and lifted, the disk 8 can be securely fixed to the turntable 3 even if the magnetic attraction force between the magnet 5 and the clamper 4 is small. Therefore, a large force is not required for attaching and detaching the clamper 4.

Next, the operation of opening and closing the clamper of such a disk clamp device will be described with reference to FIG. FIG.
FIGS. 7A and 7B show the disk clamp device shown in FIGS. 1 and 2 with an opening and closing mechanism for the clamper 4 attached thereto. FIG. 3A is a cross-sectional view showing a state in which the clamper 4 is closed, that is, when the disk 8 is rotating.
FIG. 3B is a cross-sectional view showing a state in which the clamper 4 is open, that is, when the disk 8 is replaced.

In FIG. 3, the arm 9 holds the clamper 4 at its tip end so as to be rotatable, restrains the clamper 4 in the vertical direction, and moves up and down as the arm 9 moves up and down. In the case of this example, the clamper 4 is loosely fitted into a clamper holding hole 9a formed at the tip of the arm 9, the clamper flange 4a is supported by the arm 9, and the clamper 4 moves up and down in accordance with the vertical movement of the arm 9. ing.
The rear end of the arm 9 is supported by an arm moving rod 10, and the arm 9 moves up and down by the vertical movement of the arm moving rod 10. The arm moving rod 10 can be moved manually, but it is convenient to automatically move the arm moving rod 10 by a general driving source. Further, the opening / closing mechanism of the clamper 4 can be used integrally with the lid of the drive device, and the opening / closing of the lid and the clamp holding and releasing of the disc can be linked.

In the embodiment of the disk clamp device described above, the locking pin 6 is attached to the turntable 3 and the pin hole 11 is provided in the clamper 4. However, the locking pin is provided in the clamper. Obviously, the same effect can be obtained by providing the pin hole in the turntable. Also, it will be apparent that the magnet 5 is provided on the turntable 3, but the magnet is provided on the clamper, and the attraction portion of the corresponding turntable can be made of a magnetic material. Further, in the embodiment, the locking pin 6 is also used as the rotating shaft 2 of the spindle motor 1 and a simple device is shown. However, the mounting position of the locking pin, and therefore the position of the pin hole, is not limited to the center part. Can be provided at an appropriate position according to the conditions.

With respect to the number of locking pins, in the embodiment, one locking pin 6 is provided at the center of the turntable 3, but a plurality of locking pins may be provided. When a plurality of locking pins are provided, the horizontal force applied to each locking pin is reduced, so that the thickness of each locking pin can be reduced. Furthermore, the shape of the locking pin is
The shape is not limited to a columnar shape having a tapered tip as in the embodiment, but may be a prismatic shape. If the tip of the locking pin has a taper, the disk can be easily inserted. Further, in the case of the prismatic shape, there is an advantage that it does not shift in the rotation direction.

As for the fitting tolerance between the locking pin and the pin hole, the smaller the tolerance, the greater the effect of stably holding the disk. However, it is necessary to attach and detach the clamper, and the tolerance may be reduced as long as the clamper is not hindered. Further, as for the relationship between the locking pin and the pin hole, in this embodiment, the locking pin 6 is configured to penetrate the pin hole 11 in view of the stability of the clamper 4 and the ease of manufacturing the device. It is not always necessary to have a configuration that penetrates the pin hole.In some cases, the pin hole is longer than the pin hole, and even if the locking pin is halfway through the pin hole, it must be long enough to prevent the displacement of the clamper. All you have to do is have it.

As described above, the disk clamp device of the present invention can securely hold the disk even when an external force acts during rotation, so that the performance and reliability of the disk clamp device can be improved by using the disk clamp device. . Further, by using such a disk drive device for an image pickup device, particularly for a portable camera, the performance and reliability of the image pickup device can be improved.

[0022]

As described above, the present invention provides a turntable on which a disc is placed, a clamper for pressing the disc, a magnet for attracting and coupling the turntable and the clamper,
In a disk clamp device having a disk clamped between a turntable and a clamper, a locking pin is provided on the turntable or the clamper, and a pin hole is formed in the clamper or the turntable. Since the locking pin is fitted into the pin hole, even if Coriolis force is applied to the disk on the turntable by external force, the clamper does not tilt and the attraction force of the relatively small magnet Thus, the disk can be reliably held, which contributes to the improvement of the reliability of the disk drive device.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a disk clamp device according to the present invention.

FIG. 2 is a cross-sectional view showing one embodiment of a disk clamp device according to the present invention.

3A and 3B are diagrams for explaining an open / closed state of a clamper in the disk clamp device, wherein FIG. 3A is a cross-sectional side view of the disk clamp device showing a closed state of the clamper;
(B) is a sectional side view of the disk clamp device showing the clamper in an open state.

FIG. 4 is a side view showing a disk drive device incorporated in the camera.

FIG. 5 is a cross-sectional view showing an example of a conventional disk clamp device.

6A and 6B are diagrams for explaining the relationship between the rotation of the disk and the Coriolis force, wherein FIG. 6A is a top view of the disk, and FIG.
FIG. 3 is a view taken along the line AA in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spindle motor 2 Rotation axis 3 Turntable 4 Clamp 5 Magnet 6 Locking pin 8 Disk 9 Arm 10 Arm moving rod 11 Pin hole 30 Camera 40 Disk drive device

Claims (4)

[Claims] A turntable on which a disc is placed, a clamper for pressing the disc, and a magnet for attracting and coupling the turntable and the clamper are provided, and the disc is sandwiched between the turntable and the clamper. A locking pin is provided on the turntable or the clamper, a pin hole is formed in the clamper or the turntable, and the locking pin fits into the pin hole. A disk clamp device characterized by the above-mentioned. 2. The disk clamp device according to claim 1, wherein said locking pin is formed at a tip of a rotation shaft of a motor for rotating said turntable. 3. A disk drive device comprising the disk clamp device according to claim 1. 4. A portable imaging device comprising the disk drive device according to claim 3.