JPH02246043A - Disk clamping device - Google Patents

Abstract

PURPOSE:To prevent vibration in fast rotation from being transmitted to a device by providing a second centering member and a coupling means to couple the member with a spindle or a turntable. CONSTITUTION:The device is equipped with the turntable 3 to load a disk 1, the spindle 2 to drive rotatably the turntable 3, and a clamper 8 to clamp the disk 1 by pressing on the turntable 3. Also, the device is equipped with a first centering member 4 freely engageable with a center hole in one direction of the disk 1, the second centering member 30 freely engageable with the center hole in the other direction of the disk 1, and the coupling means to couple the second centering member 30 with the spindle 2 or the turntable 3. Thereby, it is possible to simplify a thrust receiver 12 which supports a clamper block, or the thrust receiver 12 of the spindle 2, and to prevent the vibration in the fast rotation from being transmitted to the device.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a disc player for reproducing information from a disc on which information is recorded on both sides, and particularly to a disc clamping device thereof.

2. Description of the Related Art Recently, optical discs that record video and audio on both sides have become popular. There are 3 video optical discs currently in use.
Since the recording time on one side is about 80 minutes with a diameter of 0 cm, in order to record a movie etc. that is longer than 60 minutes, it is necessary to
Continuously recorded on the back. Therefore, a disc player that can continuously play both front and back sides is convenient for playing such discs, and the demand for such disc players is expected to increase in the future.

On the other hand, the video optical disc is constructed as a double-sided disc by laminating two discs with signals recorded on one side. The signals of each disk are recorded in a spiral shape around the center hole provided in each disk. In manufacturing, it is difficult to bond two discs together with their center holes perfectly aligned, so when a double-sided disc is completed, the two center holes are often misaligned. When playing a disc with such a misaligned center hole, when playing one side, rotate the disc around the center hole of that side,
When regenerating the other side, it must be rotated around the other center hole. If the disk is rotated around a center hole on a surface different from the playback surface, the center of rotation and the center of the recorded signal will be misaligned, so there is a risk that the signal will not be read correctly. For this reason, in a disc player that can play both sides of a disc without turning the disc over, when changing the playing surface, it is necessary to ensure the correct rotation center by changing the center hole of the disc in accordance with the playing surface.

A conventional disk clamp device will be explained below.

FIG. 5 shows a perspective view of the entire conventional disk clamp device, FIGS. 8, 7, and 8 are right side views thereof, and FIGS. 9, 10, and 11. is a sectional view of the clamper block.

In FIG. 9, reference numerals la and 1b are transparent disks on which signals are recorded on one side, and the disk 1 is constructed by pasting the respective signal surfaces on the inside of each other.

2 is a spindle, and 3 is a turntable on which the disk 1 is mounted, which is fixed to the spindle 2 and rotates as a unit. 8 is a holding member to which a thrust receiver 12 is attached.

Reference numeral 4 denotes a first centering member built into the turntable 3, which is slidably held along the spindle 2, and a tapered portion 4a formed concentrically with respect to the spindle 2 aligns with the center hole of the disk 1a. It can be freely engaged with. 5 is held between the turntable 3 and the first centering member 4, and
This is a first centering spring for elastically biasing the centering member 4 toward the center hole of the disk 1a. 6 is a second centering member having a guide hole 6b in its center and a tapered portion 6a formed concentrically with the guide hole 6b on its outer periphery; the guide hole 8b is engageable with the spindle 2; Further, the tapered portion 6a is a disk 1
It can be freely engaged with the center hole of b. 7 is a second centering spring that is held between the holding member 9 and the second centering member θ and elastically urges the second centering member 6 toward the center hole of the disc 1b; A clamper 10 for pressing the turntable 3 is a clamper spring that is held between the holding member 9 and the clamper 8 and applies a pressing force to the clamper 8. Reference numeral 11 denotes a pressing member for pressing the holding member 9 upward or downward, and two bottles 11a are set up on each side of the holding member 9 (FIG. 5). Second centering member 6
．． 2nd centering spring 7° clamper 8. Holding member 9. The clamper spring 10 constitutes a clamper block.

In FIG. 5, 17 is a tray on which the disk 1 is mounted;
18 and 19 are provided on both sides of the tray 17.
These are tray holders for supporting bins 18 and 18, respectively.
a* 19a (not shown) is planted. 14.
15 is a pin 18a, 1 planted in the tray receiver 18°19.
9a and a clamp cam having a cam groove that engages with a pin lla planted in the pressing member 11, and each has a guide plate 20.
．． It is supported on the outer surface of 21 so as to be movable in the horizontal direction.

16 is a cam drive motor that drives the clamp cam 14;
6a is a cam drive gear 22 that is attached to the cam drive motor 16 and meshes with a rack formed on the clamp cam 14;
are left and right interlocking gears for interlocking the movements of the clamp cams 14 and 15 on both sides, and each clamp cam 1
Two gears that mesh with racks formed in 4.15 are fixed to both ends of the connecting shaft. The guide plate 20.21 is provided with a guide groove 20a for guiding the pins 11a+18a, 19a.

In FIG. 8, the clamp cam 14 has 14a and 14b.
A cam groove is formed. The pressing member 11 has a pin ll.
a is upright and engaged with the cam groove 14b. A pin 18a is installed in the tray receiver 18, and the cam groove 14a
is engaged in.

FIG. 9 shows a sectional view of the clamper block with the disk 1 mounted on the turntable 3. The disk 1 is made by joining disks 1a and 1b, and the center holes of each disk are shifted from each other.

The operation of the clamp device configured as described above will be explained below.

First, in FIG. 5, when the disk 1 is mounted on the tray 17, the cam drive motor 16 rotates and the cam drive gear 18a
The crank and book cam 14 are driven by. The movement of the clamp cam 14 causes the left and right interlocking gear 22 to rotate, driving the other clamp cam 15. Then, as shown in FIG. 6, the cam drive gear lea rotates to the left, so that the clamp cam 14 moves to the left, and the clamp cam 14 moves to the left, and the cam groove 14a and the guide groove 20a provided in the guide plate 20 (shown in FIG. 5) move. The tray receiver 18 is driven downward along the line. Also, cam groove 1
4b and the guide groove 20a, the pressing member 11 is also driven downward, resulting in the state shown in FIG.

A sectional view of the clamper block at this time is shown in FIG. In FIG. 10, the holding member θ is
is pressed, and due to the compression force of the clamp spring 10, the clamper 8
clamps disk 1.

When clamped, the tapered portion 4a of the first centering member 4 engages with the center hole of the disk 1a. Further, the tip of the spindle 2 is engaged with the guide hole θb of the second centering member 8, and the rotation center of the clamper block is made to substantially coincide with the rotation center of the spindle 2. In this way, the center of the disk 1a of the disk 1 coincides with the center of the spindle 2. Rotation of the spindle 2 causes the turntable 3 to rotate. A rubber 3a is provided on the disk mounting surface of the turntable 3, and the rotational force of the turntable 3 is transmitted to the disk 1 by the frictional force between the rubber 3a and the surface of the disk 1 (disc 1a). Rotationally driven.

Next, insert the disk 1 from the opposite side, that is, the disk 1b.
The case of playing from the side will be explained.

In this case, the center of the disc 1b of the disc 1 and the spindle 2
It is necessary to match the centers of the

When the clamp cam 14 moves further to the left from the state shown in FIG. 7, only the pressing member 11 moves downward along the cam groove 14b, resulting in the state shown in FIG. 8. The operation of the clamper block at this time is even more than the state shown in FIG.
is lowered, the second centering member 8 pushes down the first centering member 4 due to the compressive force of the second centering member spring 7, and the tapered part 6a of the second centering member 6 is brought into contact with the corner of the center hole of the disk 1b. come into contact with

As mentioned above, the disk 1 is composed of two disks 1a+tb joined together with their center holes shifted from each other, and in the state shown in FIG. 7, the center of the disk 1a and the center of the spindle 2 are aligned. The center of the disk 1b and the center of the spindle 2 are offset.

On the other hand, since the second centering member 8 is engaged with the spindle 2 to ensure a mutually concentric state, when the second centering member 6 comes into contact with the center hole of the disk 1b, due to the deviation, One-sidedness occurs. Therefore, when the second centering member 6 further descends, a component force is applied from the tapered portion 6a in the radial direction of the disc 1b, thereby causing the disc 1 to engage with its center hole while moving in the radial direction. This state is shown in FIG.

In this way, the center of the disc 1b coincides with the center of the spindle 2, and the disc 1 is brought into a state where it can be played back.

Problems to be Solved by the Invention In the above centering operation, when the second centering member 6 is engaged with the center hole of the disk 1b of the disk 1, the turntable 3
It is necessary to move the disk clamped by the clamper 8 on the turntable. turntable 3
Since the rubber 3a is bonded to the disk mounting surface of
To move the disc, use the disc surface and the rubber 3a.
It is necessary to generate a component force sufficient to overcome the frictional force between the surface and the clamper surface, and the force pushing down the second centering member 8 must be increased. In the above-described configuration, even after the centering operation is completed, the same force applied during centering continues to be applied to the second centering member 6. For this reason, the thrust receiver 1 that supports the clamper block
2 must be able to withstand a large load while rotating at high speed, and must also have high rotational accuracy in terms of vibration. Therefore, expensive thrust bearings and the like were required. The same applies to the thrust receiver of the spindle 2. In addition, since a large force continues to be applied to the center hole of the disk 1b from the tapered part of the second centering member 6,
There was also a concern that the inner periphery of the center hole would be easily damaged.

In view of the above-mentioned problems, the present invention provides a disk clamping device that can keep the force applied to the clamper block to the necessary minimum when the disk is rotated after centering of the disk is completed.

Means for Solving the Problems In solving the above problems, the inventors focused on the following points. That is, (1) when transitioning from the operating state of the first centering member to the operating state of the second centering member, a large force is required only at the moment when the second centering member is engaged with the center hole of the disk. .

(2) When the second centering member is in operation and the disc is being driven to rotate, it is sufficient that the disc is clamped so that it does not shift on the turntable, and the clamping force required for this is the same as that of the second centering member. This is considerably less than the force required to engage the exit member into the central hole of the disc.

Therefore, the force applied to the clamper block can be switched between two stages. However, even when the applied force is weakened, it is necessary to keep the second centering member in the operating state.

From the above points of view, the disk clamp device of the present invention includes a turntable for mounting a disk, a spindle for rotationally driving the turntable, a clamper for pressing and clamping the disk against the turntable, and the a first centering member that can freely engage the center hole from one direction of the disk; a second centering member that can freely engage the center hole from the other direction of the disk; a first pressing force that applies a first pressing force to the second centering member necessary for centering the disk; and a first pressing force that is smaller than the first pressing force necessary for the clamper to clamp the disk. and a second pressing means that applies two pressing forces to the clamper, and when the first centering member is in an operating state and the second core member is in an operating state, the first centering member is applied to the disk. The switching means is configured to switch to the operating state of the second pressing means after the suppressing means is activated.

Further, when switching from the operating state of the first pressing means to the operating state of the second pressing means, the second centering member and the spindle or the turn are arranged so that the second centering member does not become inactive. The configuration includes a coupling means for coupling the tables.

According to the above-described structure, when the second centering member engages with the center hole of the disk, the first pressing force necessary for centering the disk is applied to the second centering member. After the centering operation is completed, a second pressing force smaller than the first pressing force is applied to the clamper instead of putting the first suppressing means into a non-operating state. Enables centering and disc clamping operations using force. Further, even when the first pressing means is inactive, the second centering member is connected to the spindle or turntable, so the state in which the second centering member is engaged with the center hole of the disk is ensured. be done.

Embodiment Hereinafter, a disk clamping device according to an embodiment of the present invention will be described with reference to the drawings.

1, 2, and 3 are cross-sectional views of a clamper block in the clamping device of the present invention.

The overall configuration of the clamp device for driving this clamper block is the same as that of the conventional example shown in FIG. 5. Also, regarding the configuration of the clamper plotter, the same components as the conventional ones are given the same reference numerals. In the figure 1al 1
b is a transparent disk on which a signal is recorded on one side, and the disk 1 is constructed by bonding the disks so that the respective signal surfaces are on the inside of each other. 2 is a spindle, and 3 is a turntable on which the disk 1 is mounted, which is fixed to the spindle 2 and rotates as a unit. 9 is a holding member to which a thrust receiver 12 is attached.

Reference numeral 4 denotes a first centering member built into the turntable 3, which is slidably held along the spindle 2, and a tapered portion 4a formed concentrically with respect to the spindle 2 aligns with the center hole of the disk 1a. It can be freely engaged with. 5 is held between the turntable 3 and the first centering member 4, and
This is a first centering spring for elastically biasing the centering member 4 toward the center hole of the disk 1a. 32 is a stopper for preventing the first centering member 4 from falling off the spindle 2, and a ring-shaped ferromagnetic body is fixed to the spindle 2. 30 is a second centering member having a guide hole 31a at its center and a tapered portion 30a formed at the outer periphery concentrically with the guide hole 31a. An annular permanent magnet 31 having the same inner diameter as the guide hole 31a and concentrically arranged is fixed to the lower center of the second centering member 30. The guide hole 31a common to the second centering member 30 and the permanent magnet 31 is engageable with the spindle 2, and the tapered portion 30a is engageable with the center hole of the disk 1b. 7 is the holding member 9 and the second
A second centering spring 8 is held between the centering members 30 and elastically urges the second centering member 30 toward the center hole of the disc 1b; 8 is a spring for pressing the disc 1 against the turntable 3; The clamper 10 is a clamper spring that is held between the holding member 9 and the clamper 8 and applies a pressing force to the clamper 8. Reference numeral 11 denotes a pressing member for pressing the holding member 9 upward or downward, and two pins lla are installed on each side of the holding member 9 (FIG. 5).

The second centering member 80 described above. Second centering spring7. Clamper 8. Holding member 9. The clamper spring 10 constitutes a clamper block.

The operation of the above-mentioned clamper device will be explained below.

FIG. 1 shows a sectional view of the clamper block with the disk 1 mounted on the turntable 3. As shown in FIG. 2 and 7 show a state in which the first centering member 4 engages with the disk 1a of the disk 1 and is clamped by the turntable 3 and the clamper 8. The operations up to this point are similar to those of the conventional example. This is equivalent to that explained in FIGS. 5 and 6.

When the clamp cam 14 moves further to the left from the state shown in FIG. 7, the suppressing member 11 moves downward by the cam groove 14b, resulting in the state shown in FIG. 8. The state of the clamper block at this time is shown in FIG. While moving it, it engages with the center hole of the disk 1b to perform centering. Also,
A permanent magnet 31 provided at the bottom of the second centering member 30
is attracted to a stopper 32 fixed to the spindle 2, so the second core member 30 is magnetically coupled to the spindle 2.

Immediately after the above centering operation is completed, the clamp cam 14
moves to the right, and stops at a position where the pressing member 11 has been moved upward by a predetermined amount by the cam groove 14b. This operation brings the clamper block into the state shown in FIG. The pressing member 11 rises from the state shown in FIG. 3 and becomes separated from the thrust receiver 12. Furthermore, since the outer peripheral portion of the holding member 9 is also in a position where it does not come into contact with the pressing member 11, no force is applied to the clamper block from the pressing member 11. On the other hand, the clamper 8 presses the disk 1 against the turntable 3 in response to the force (second pressing force) generated by the clamper spring 10, but the reaction force is applied to the holding member 9. This reaction force is applied to the second centering member 30 via the holding member 9.
and acts to raise it. However, since the second centering member 30 is magnetically coupled to the spindle 2, it holds the holding member 9 and the clamper 8 without rising. In order to achieve the above operation, the following conditions must be met. (1) The coupling force that magnetically couples the second centering member 30 to the spindle 2 is greater than the second pressing force.

(2) The force applied from the pressing member 11 to the holding member 9 is
Must be greater than the pressing force.

Generally, the first pressing force is much larger than the second pressing force. Therefore, a considerably large force is required to be applied from the pressing member 11 to the holding member 9 via the thrust receiver 12.

However, as described above, the first pressing force is applied only at the moment when the second centering member 30 moves the clamped disk 1 in its radial direction, and then the first pressing force is removed, and the disk 1 is moved instead. By continuing to apply only the necessary second pressing force to the clamp, centering operation can be achieved with the minimum necessary force.

Effects of the Invention As described above, the present invention provides a method that allows the second centering member to engage only at the moment when the second centering member engages with the center hole of the disk when transitioning from the operating state of the first centering member to the operating state of the second centering member. Great power (1st
By applying a second pressing force, which is smaller than the first pressing force, to clamp the disk so that it does not shift on the turntable when the disk is being rotated, the clamper block is The thrust receiver to support and the thrust receiver of the spindle can be simplified, and vibrations during high-speed rotation can be prevented from being transmitted to the device. Further, since a large force is not continuously applied to the center hole of the disk from the tapered portion of the second centering member, the fear of damaging the inner peripheral portion of the center hole is reduced.

[Brief explanation of drawings]

1, 2, 3 and 4 are cross-sectional views of a clamper block according to an embodiment of the present invention, FIG. 5 is a perspective view of the entire conventional disc clamping device, and FIGS. 6 and 7. and FIG. 8 is its right side view, FIG. 10 and 11 are cross-sectional views of a clamper block of a conventional disk clamp device. 1... Disc, 1al 1b... Disk,
2...Spindle, 3...Turntable,
3a...Rubber, 4...First centering member, 5...
・First centering spring, 6.30... Second centering member, 7
...Second core spring, 8...Clamper, 9...
Holding member, 10... Clamper spring, 11...
- Pressing member, 12... Thrust receiver, 14.
15... Clamp cam, 16... Cam drive motor 1.16a... Cam drive gear, 17... Tray 1
．． 18, 19...Tray receiver, 20.21...Guide plate, 22...Right and left interlocking gear, 31...Permanent magnet, 32...Stopper. Name of agent: Patent attorney Shigetaka Awano Haka 1 person! −・−
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Claims (2)

[Claims] (1) A turntable for mounting a disk on which signals are recorded on both sides and having a center hole at the center thereof, and a spindle for rotationally driving the turntable;
a clamper for pressing and clamping the disk against the turntable; a first centering member that can freely engage the center hole of the disk from one direction; and a first centering member that engages the center hole of the disk from the other direction. A disk clamp device comprising: a second centering member which is freely adjustable; and coupling means for coupling the second centering member to the spindle or the turntable. (2) a turntable for mounting a disk on which signals are recorded on both sides and having a center hole at the center thereof; and a spindle for rotationally driving the turntable;
a clamper for pressing and clamping the disk against the turntable; a first centering member that can freely engage the center hole of the disk from one direction; and a first centering member that engages the center hole of the disk from the other direction. a second centering member that is freely movable; a first pressing means that applies a first pressing force to the second centering member necessary for the second centering member to center the disk; a second pressing means for applying a second pressing force to the clamper that is smaller than the first pressing force necessary for clamping the disk, and the second pressing means applies a second pressing force to the clamper that is smaller than the first pressing force necessary for clamping the disk, and 1. A disk clamping device comprising: switching means for causing the first pressing means to act on the disk and then switching to the acting state for the second pressing means when shifting to the working state of the member.