JPS634454A - Disk clamping device - Google Patents

Abstract

PURPOSE:To make a device thin and light weighed, small in the clamp releasing force and to eliminate an exclusive driving source by lifting the end part of a lamp head holder by a clamping arm and separating from the magnet attraction force by utilizing the lever action with the surface of a disk as the fulcrum. CONSTITUTION:The disk 7 is adjusted to the co-axial position with a rotary shaft 16 by a centering guide 23 and pinched between the annular clamp ring 25 providing on a clamp head 18 and a turn table 17. The pinching force thereof elastically pinches with adsorbing the fluctuation in the thickness of the disk 7 with the work of a corrugated plate spring 24 by the magnetic suction force of the annular magnet 20 of the clamp head 18 and the magnetic base 30 of a rotary shaft 16. In case of releasing the clamp, a clamp head holder 26 supported by the fulcrum 27a of a clamp arm 27 is inclined with the contact point of the tip of a clamp ring 25 and the surface of the disk 7 as the fulcrum according to the clamp arm 27 rotating in the direction of an arrow mark A. The annular magnet 20 of the clamp head 18 is separated from the magnetic base 30 like its end being lifted up. In such a way the separation from the magnetic suction force is enabled with extremely light driving force.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a disk clamp device used for driving optical disks, magneto-optical disks, CDs (compact disks), and the like.

(Prior Art) Conventionally, disk clamp devices used in disk drive devices include a spring type that utilizes the biasing force of a spring, and a magnet type that utilizes the attraction force of a magnet. A spring-type disk clamp device has a simple structure, as described in Japanese Patent Laid-Open No. 59-2256, and is therefore often used in CD players and the like.

In addition, the disk clamping device in the magnetic direction was developed in U.S. Pat.
As described in Japanese Patent No. 176291, it has a structure in which a disc is held between the discs by the attraction force of a magnet, and this is also used in CD players and laser disc players.

FIGS. 4(a), 4(b) and 4(c) show an example of a spring type disk clamping device. In the same figure, the disk drive device is rotated by a spindle consisting of a spindle motor 2 and a rotating centering table 3 installed approximately in the center of a base 1, and a support shaft 4 of a column provided at both ends of the base 1. It is composed of a disk storage frame 5 which is freely attached, and a clamp device fixing frame 6 which is rotatably attached to the same support shaft 4 mentioned above.

The centering table 3 has a truncated conical guide protrusion 3a and a guide layer 3b so that the disk 7 is concentric with and perpendicular to the rotation axis of the spindle.

The disk storage frame 5 is formed by bending two side plates 5a and a bottom plate 5b, and a stopper 5C and a through hole 5d are provided at the back and center of the bottom plate 5b, respectively.

The front opening 5e is an input port into which the disk 7 is inserted.

The clamp device fixing frame 6 is made up of two side frames 6 formed into an H shape.
a, a connecting frame 6b, and an operating frame 8 that connects the two side frames 6a at the front. The disk clamp device attached to the above-mentioned connecting frame 6b has a sliding shaft 9 provided with a stopper 9a and a spring seat 9b at the upper end and approximately the center, respectively, and a bearing 1 at the lower end of the sliding shaft 9.
Clamp head 1 rotatably attached via 0
1, and a compression coil spring 12 attached to the above-mentioned sliding shaft 9 which urges the clamp head, and the above-mentioned sliding shaft 9 is mounted through a hole 6c provided in the center of the above-mentioned connecting frame 6b.
The compression coil spring 12 is inserted in a compressed form between the lower surface of the connecting frame 6b and the spring seat 9b.

Furthermore, in order to interlock the disk storage frame 5 and the clamp device fixing frame 6, the bottom plate 5b and the operation frame 8 are provided.
are connected by a tension coil spring 13, and a compression coil spring 14 is fixed between the base 1 and the operation frame 8, which functions to return the disk storage frame 5 and the clamp device fixing frame 6 to their original positions. There is. Furthermore, a guide post 15 is installed on the base 1 to determine the position of the disc storage frame 5 when the disc is mounted.

The clamp head 11 has a shallow bowl shape with a guide layer 3b of the spindle centering table 3 at the lower end.
A flat edge portion 11a for holding the disk 7 is formed.

The operation of the disk drive device and disk clamp device having such a configuration will be explained. First, Figure 4(a)
As shown in FIG. 3, the disk 7 is inserted into the disk storage frame 5 through the opening 5e. The inserted disk 7 is the stopper 5
When it reaches C, the operating frame 8 is pushed down against the repulsive force of the compression coil spring 14. A tension coil spring 13 fixed to the operation frame 8 pulls down the disk storage frame 5 until it hits the guide column 15 and is fixed in position.

First, the disk storage frame 5 is lowered, and the spindle centering base 3 inserted through the through hole 5d supports the disk 7.
The guide protrusion 3a provides centering, and the guide layer 3b provides horizontality. Next, the clamp device fixing frame 6 is lowered, and the clamp head 11 is lowered.
The flat edge portion 11a of the disk 7 is sandwiched between the guide layer 3b and the guide layer 3b, and when the disk 7 is lowered further, the compression coil spring 12 is bent and the disk 7 is fixed.

When the spindle motor 2 rotates and drives the disk 7, the clamp head 11 is supported by a bearing 10 around the sliding shaft 9 and rotates lightly to move the disk 7 to the centering table 3.
The disk 7 is held in the correct rotational plane by pressing against the guide layer 3b.

Figure 5 is a cross-sectional view of a magnetic disk clamp device.
The disk clamp device includes a rotary table 17 fixed to a rotating shaft 16 of a spindle, a clamp head 18 that clamps the disk 7 between the rotary table 17, and an engagement formed on the foot of the clamp head 18. Tsuba 11a
an annular magnet 20 fixed near the upper end of the spindle rotating shaft 16, and an annular magnet 20 opposite to the annular magnet 20. An annular magnetic body 21 fixed inside the clamp head 18 and the spindle rotating shaft 16
and a centering guide 23 that is slidably fitted into the center and biased upwardly by a compression coil spring 22.

The operation of the magnetic disk clamping device having such a configuration will be explained 6. First, when the disk 7 mounted on the disk storage frame (not shown) comes down together with the disk storage frame, the cone of the centering guide 23 The surface guides the inner diameter of the central through hole of the disk 7 and makes it concentric with the spindle rotation axis 16. Subsequently, when the connecting frame 6b of the clamp fixing frame descends, the clamp head 18 held in the engagement box 19 moves into its center hole 18.
At b, the disk 7 is guided by a conical surface provided at the end of the spindle rotation shaft 16 and adjusted concentrically, and the disk 7 is sandwiched between the rotation table 17 and the rotation table 17. Further, when the connecting frame 6b is lowered, the engagement collar 18a of the clamp head 18 comes to play in the engagement box 19 and separates from the inner wall thereof. At the same time, the annular magnet 20 fixed to the spindle rotating shaft 16 attracts the annular magnetic body 21 fixed to the inside of the clamp head 18,
The disk 7 is clamped by magnetic attraction force.

(Problems to be Solved by the Invention) However, although the spring type disk clamp device has a simple structure and is inexpensive, the rotating clamp head 11
The problem is that it is not suitable for business use, which requires a long life, or for disk drives that rotate at high speeds.

In addition, in the magnetic type disk clamping device, the rotating clamp head 18 and the engagement box 19, which has a support mechanism for attaching and detaching the disk 7, are clamped in a non-contact state, so it can be used for commercial or high-speed applications. It is suitable for rotating disk devices, but when releasing the clamp, the annular magnetic body 21 is pulled away in the vertical direction by overcoming the magnetic attraction force, so a large driving force is required, and a dedicated drive device and a large space to install it are required. There was a problem that required

There are disk clamping devices that also use springs to adjust the magnetic attraction force during clamping, but they still require a dedicated drive device and space for its installation.

The present invention solves the above problems and is thin and lightweight.
The present invention provides a compact magnetic type disk clamping device that has a small unclamping force and does not require a dedicated drive source.

(Means for Solving the Problems) In order to solve the above problems, the present invention first uses a disk device in which a disk cartridge is mounted, and a clamp head holder that holds a clamp head equipped with a magnet with play. and a clamp arm that rotatably supports this clamp head holder. A cam roller provided on the above-mentioned clamp arm is driven to rotate the clamp arm, and the clamp arm supports the above-mentioned clamp. The end of the head holder is lifted and released from the magnetic attraction force using a lever action using the surface of the disk as a fulcrum. Further, the crank arm is rotated until it reaches a horizontal state, and a locking mechanism is provided so that the clamp head holder also becomes horizontal in that state.

(Function) With the above configuration, when a disk cartridge is installed, the magnet fixed to the clamp head is attracted to the magnetic body fixed to the spindle rotating shaft, holding the disk and at the same time holding it with some play. Since there is no contact with the clamp head holder, there are no wear parts and a long life.

When the clamp arm rotates when the clamp is released, the clamp head holder, which is rotatably supported at one end by the clamp arm, is tilted with the other end using the surface of the disk as a fulcrum, and is lifted using the lever action. It turns out. The attraction force between a magnet and a magnetic material is extremely large when the magnet is pulled apart perpendicular to its surface, but it is small when the magnet is pulled apart while being rotated at an angle.By utilizing this fact, the clamp can be released with an even smaller pulling force using the principle of leverage. becomes possible.

Furthermore, when the clamp is completely released, the clamp head is held horizontally together with the clamp arm by the clamp head holder, as in the case of clamping.

Therefore, the gap required for play between the clamp head and the clamp head holder can be minimized, and the clamp head can be made extremely thin.

(Example) An example of the present invention will be described with reference to FIGS. 1 to 3. 1, 2, and 3 are side sectional views of the disk clamping device according to the present invention, showing the disk clamping state, the intermediate state of clamping or unclamping, and the fully ramped state, respectively. Note that the same components as in the conventional example will be described with the same symbols.

In FIG. 1, the disk clamping device includes a rotary table 17 attached to a rotating shaft 16 of a spindle motor 2 fixed to a base 1, and a clamp head 18 provided with an annular clamping rod 25 biased by a wavy leaf spring 24. , a clamp head holder 26 which supports this clamp head 18 with play in an engagement groove 18d provided on its outer periphery, and has an annular magnet 20 provided therein.

This clamp head holder 26 is rotatably mounted on a fulcrum 27a.
a clamp arm 27 that is supported by a cam roller 29 that is supported to rotate freely around a support shaft 28 provided on the base 1 and that follows a drive cam (not shown);
A magnetic stand 30 having a center hole in the center fixed to the tip of the rotating shaft 16 of the spindle motor 2, a pre-centering guide 31 fixed to the rotating shaft 16 so as to surround the magnetic stand 30, and a rotating The centering guide 23 is slidably fitted onto the shaft 16 and biased upward by a compression coil spring 22. Further, the clamp head holder 26 is provided with a locking portion 26a extending from its end, and the clamp arm 27 is provided with a stopper 27a that engages with the locking portion 26a.

Note that the disk drive device of the present invention includes a cartridge 32.
Since the disk 7 that is still loaded in the base 1 is installed, the base 1
includes a pedestal 33 for determining the horizontal position of the cartridge 32;
A guide pin 34 is provided to determine the mounting position and horizontal position of the cartridge 32.

The operation of the disk clamp device configured in this way will be explained.

FIG. 1 shows a state in which the disk 7 loaded in the cartridge 32 is completely clamped. It is held between the ring 25 and the rotary table 17. The clamping force is generated by the magnetic adsorption force between the annular magnet 20 of the clamp head 18 and the magnetic base 30 of the rotating shaft 16, and by the action of the corrugated leaf spring 24, the elastic force is generated while absorbing variations in the thickness of the disk 7. to hold.

Since the clamp head holder 26 and the clamp head 18 are not in contact with each other, there is no wear even when the rotating shaft 16 rotates.

When releasing the clamp, the cam roller 29 is pushed up by a drive cam (not shown), and the clamp arm 2
7 rotates in the direction of arrow A. Figure 2 shows a state in which the clamp arm 27 has begun to rotate in the direction of arrow A.
As the clamp head holder 26 rotates, the clamp head holder 26 supported by its fulcrum 27a tilts about the point of contact between the tip of the annular clamp holder 25 and the surface of the disk 7 as a fulcrum. The annular magnet 20 of the clamp head 18 is separated from the magnetic table 30 so that its end is lifted. Therefore, it is possible to separate from the magnetic attraction force with an extremely light driving force. Further, since the clamp head holder 26 also functions as a lever, the driving force required for detachment can be extremely small.

FIG. 3 shows a state in which the clamp has been released, and the locking portion 26a of the clamp holder 26 is attached to the clamp arm 2.
It engages with the stopper 27a of No. 7 and is kept horizontal. Even when mounted as shown in FIG. 1, the clamp head holder 26 is guided by the cartridge 32 and kept in a horizontal position, so the clearance required for play between the clamp head 18 and the clamp head holder 26 can be extremely small. Therefore, a thin disk clamp device can be obtained.

(Effects of the Invention) As explained above, according to the present invention, a thin disk clamping device with an extremely small gap required for play between the clamp head and the clamp head holder can be obtained.

In addition, since the force required to release the magnetic attraction force when releasing the clamp is extremely small, the drive source for attaching and detaching the clamp is small.
A compact disk clamping device that does not require rigidity can be obtained.

Further, since the drive source for attaching and detaching the clamp is small, a dedicated drive source is not required, and the drive source of the loading device can be shared, making it possible to downsize the disk drive device.

[Brief explanation of drawings]

1, 2, and 3 are cross-sectional views of the disc clamping device according to the present invention, respectively showing the states when the disc is mounted, in the middle of clamping or unclamping, and when the clamping is completed, and FIG. 4 ( a), (b) and (c
) is a cross-sectional view of a disk drive device equipped with a conventional spring-type disk clamp device, showing enlarged views of the area when the clamp is released, clamped, and the vicinity of the sliding shaft, respectively. Figure 5 shows the magnetic disk clamp device. FIG. 1... Base, 2... Spindle motor, 3
...Centering block, 3a...Guiding protrusion, 3b...
Guide layer, 4... Support shaft, 5... Disk storage frame, 5a... Side plate, 5b... Bottom plate, 5c...
Stopper, 5d... Through hole, 5e... Opening, 6
...clamp device fixing frame, 6a...side frame, 6b...
...Connection frame, 6c...Mounting hole, 7...Disk, 8...Operation frame, 9...Sliding shaft, 9a, 27
b...stopper, 9b...spring seat, 10...bearing, 11.18...clamp head, 11a...
Flat edge, 12.14.22... Compression coil spring,
13... Tension coil spring, 15... Guide column,
16... Rotating shaft, 17... Rotating table, 18a
... Engaging collar, 19... Engaging box, 20... Annular magnet, 22... Annular magnetic body, 23... Centering guide, 24... Wavy leaf spring, 25... Annular clamp transport, 26... Clamp head holder, 26a...
- Locking part, 27... Clamp arm, 27a...
Fulcrum, 28... Support shaft, 29... Cam roller, 3
0...Magnetic stand, 31...Preliminary centering guide, 32.
...cartridge, 33...cradle, 34...guide pin. Patent applicant Matsushita Electric Industrial Co., Ltd. (b) 15. -, Kanenku Figure 4 10]] Figure 5 23, - IC construction Kanen

Claims (1)

[Claims] means for holding a cartridge containing a disk in a fixed position; a rotary table for centering and mounting the disk;
In a disk clamp device that includes a clamp head that clamps the mounted disk using magnetic attraction and a means for attaching and detaching the clamp head, the clamp head attaches and detaches the clamp head when the disk is clamped on the rotary table. What is claimed is: 1. A disk clamping device that rotates together with a rotary table and a disk without making contact with a means for holding the disk, and uses a lever action to separate the clamp head from magnetic attraction when removing the clamp head.