JPH01235061A - Driving/holding mechanism for disk clamper - Google Patents

Abstract

PURPOSE:To ensure satisfactory clamping force by providing a pin on one of the transmission and driving levers in a single body and forming a driving/ holding slit and a driving/holding slit where a pin, on the other hand, is approximately rectangular to the moving direction of the transmission lever and not rectangular to the driving direction of the drive lever. CONSTITUTION:When a disk clamper 32 is set at a clamping position, an angle alphais obtained between the guiding and driving directions of a pin 53. Thus the driving force is applied to the pin 53 with guidance of a driving/holding slit 54 when the right-left moving force is applied to a drive lever 52. Then the force applied to the pin 53 also tries to move a transmission lever 51. As a result, the clamper 32 is moved up and down. While the movement of the pin 53 is impossible against the force trying to spring up the clamper 32 since the guiding direction of the slit 54 is set approximately triangular to the moving direction of the lever 51. Therefore the clamper 32 is not movable and can give the satisfactory clamping force.

Description

[Detailed Description of the Invention] [Summary] This invention relates to a drive and holding mechanism for a disk clamper for clamping a disk, and includes a transmission lever integrated with a clamper arm to which a disk clamper is attached, and a drive lever driven by a drive means. One of the levers is integrally equipped with a pin, and the other lever is guided in a direction that is approximately perpendicular to the moving direction of the transmission lever and at an angle that is not perpendicular to the driving direction of the drive lever. A driving holding slit is provided to reliably clamp the disk with a relatively small force.

[Industrial application field]

The present invention relates to a disk clamper driving and holding mechanism for driving and holding a disk clamper for clamping an information recording/reproducing disk made of a rigid disk to a recording/reproducing position.

For example, in compact disk (CD), laser disk (LD) devices, etc., the recording medium is a rigid disk (
A disk-shaped medium is used. The present invention relates to a disk clamper driving and holding mechanism for driving and holding a disk clamper for clamping such a rigid disk to a recording/reproducing position.

[Conventional technology]

FIGS. 3 and 4 are diagrams showing a conventional disk clamper holding mechanism. Disc 11 is turntable 3
1 and is pressed against the turntable 31 by a disk clamper 32 attached to a clamper arm 33, thereby being clamped to a predetermined position and rotating together with the turntable 31. During rotation, it is necessary to always press the disk 11 toward the turntable 31 using the disk clamper 32 with a force above a certain level. This is to make the rotation of the disk 11 follow the rotation of the turntable 310 in a positive i direction, to suppress the rocking of the disk 11 due to rotation, and to suppress the movement of the disk 11 away from the turntable 31. The required lamp power is. A first method conventionally used to obtain this clamping force is to bias the clamper arm 33 in the clamping direction with respect to the casing by a spring 41, as shown in FIG. Another method is to cause the turntable 31 and disk clamper 32 to attract each other by magnetic force, as shown in FIG.

[Problem to be solved by the invention]

The disk clamper 32 is not only held at the clamping position, but also must be moved to a disk insertion/ejection position where the disk 11 can be inserted or ejected. However, when the disk clamper 32 is held by the mechanism shown in FIGS. 3 and 4, the force that drives the clamper arm 33 to move the disk clamper 32 to the disk insertion/ejection position is due to the bias of the spring 41. Alternatively, a problem arises in that a force greater than magnetic force is required.

If a new mechanism is added to stop the action of the force during driving, the above problem will not occur, but this will create a new problem of complicating the structure.

Therefore, an object of the present invention is to provide a disk clamper drive and holding mechanism that can obtain a sufficient ramping force even with a relatively simple and compact structure and does not require a large driving force to move to the disk insertion/ejection position. It is in.

[Means to solve the problem]

FIG. 1 is a diagram showing the principle of the present invention, in which (1) shows the disk clamper 32 in the disk insertion/ejection position, and (2)
indicates the state in the clamp position. In this figure, the pin 53 is integrated with the transmission lever 51 and the slit is provided on the drive lever 52, but the reverse is also possible. The disc clamper driving and holding mechanism of the present invention will be explained with reference to this figure. This includes a disc clamper 32 that cooperates with a turntable 31 to clamp the disc to a recording/reproducing position.
from the disk insertion/ejection position to the clamp position,
A disk clamper drive and holding mechanism for holding the disk clamper in a clamping position and moving it from the clamping position to a disk insertion/ejection position, which is driven by a transmission lever 51 integrated with a clamper arm 33 that engages a disk clamper 32, and a driving means. One of the transmission lever 51 and the drive lever 52 is provided with a drive lever 52 .
．． 52 is integrally provided with a pin 53, and the other lever 52;
51 is provided with a drive holding slit 54 that guides the pin 53 in a direction forming a drive holding angle α that is substantially perpendicular to the movable direction of the transmission lever 51 and not perpendicular to the driving direction of the drive lever 52. This is a distinctive feature of the disk clamper drive and holding mechanism.

Further, it is preferable that the other lever is provided with a drive slit 55 for guiding the pin in a direction forming a drive angle β larger than the drive holding angle α with respect to the drive direction.

[For production]

When the disk clamper 32 is in the clamping position (FIG. 1(2)), the pin 53 is guided in the drive holding slit 54. At this time, the guiding direction of the pin 53 and the driving direction are neither parallel nor perpendicular to each other, but form an angle α, so if a force is applied to move the driving lever 52 from side to side in the figure, the pin 53 will be guided by the drive holding slit 54. A force is applied to move the transmission lever 51, and this force becomes a force to move the disc clamper 32 up and down. Conversely, in response to the force acting on the disk clamper 32 from the disk 11 side and trying to flip the disk clamper 32 up, the direction of movement of the transmission lever is almost perpendicular to the guiding direction of the drive holding slit 54. pin 5
3 cannot be moved, and thus the disk clamper 32 cannot be moved. After all, for example, the elastic member 56
By applying a weak force such as that to the drive lever 52 in the clamping direction, a sufficient ramping force can be obtained.

Furthermore, the closer the value of α is to 0, the greater the force that drives the transmission lever 51, but the greater the stroke of the drive lever 52, which requires a larger space. These contradictory problems can be solved by providing the drive slit 55. In other words, at times when it is sufficient to simply drive the disk clamper 32 without requiring any clamping force, (
As shown in FIG. 1(1)), it is preferable that the pin 53 is guided by the drive slit 55 such that the angle β between the guide direction and the drive direction is larger than α.

When used together with a method of obtaining clamping force by magnetic force, the further the disk clamper 32 is away from the turntable 31, the smaller the magnetic force becomes, so the force required to drive against this becomes smaller. Generally speaking, it is appropriate to use α and β as the angles formed by the guiding direction and the driving direction, as described above, also from the point of view of relatively reducing the current at the time of starting the motor.

〔Example〕

FIG. 2 is a side view showing a CD player for playing a compact disc (CD) as an example in which the disc clamper driving and holding mechanism of the present invention is incorporated together with a disc insertion/ejection mechanism and a disc clamping mechanism. Of these (1
) represents the state immediately before the disc clamper 32 is lowered, (3) represents the state where the disc 11 is clamped between the disc clamper 32 and the turntable 31,
(2) represents a state intermediate between (1) and (3).

First, the disk insertion/ejection mechanism will be explained. The guide rail 14 is horizontally long when viewed from the disk insertion side (left side in FIG. 2), and defines the insertion position of the disk 11. The driving roller 12 moves the disk 11 to the driven roller 1.
It is rotated by a drive means (not shown) in order to insert and remove it between the two. The driven roller 13 has two ends on both ends of its shaft.
The two elastic members 16-1 and 1 are guided along two guide grooves 15-1 and 15-2 (15-2 is not shown).
Drive roller 1 by 6-2 (16-2 not shown)
Biased in direction 2.

When a disk is inserted into the long guide rail 14, it is detected by a first detector (not shown) and the drive roller 12 starts rotating in the disk insertion direction.
The driven roller 13 in contact with it also begins to rotate. At this time, the driven roller 13 and guide rail 14 are
) at the position indicated. When the disk 11 is pushed between the rotating drive roller 12 and driven roller 13, the disk 11 is drawn between the two rollers and slides in the insertion direction. When the disk 11 reaches the position shown in FIG. 2(1), a second detector (not shown) detects this and the rotation of the drive roller 12 is stopped. Figure 2 (1
), the driving roller 12 and the driven roller 13 are drawn as if they are in contact with each other, but in reality, after the two rollers have sandwiched the disk 11, the driven roller 13 is drawn as shown in the figure by the thickness of the disk 11. being pushed downwards. At this time, the guide rail 14 cannot move from the position shown in FIG. The pie sparse of the elastic members 16-1 to 16-2 act,
Uniform pressure bonding force can be obtained in the axial direction.

Next, a portion corresponding to a specific example of the disk clamper drive and holding mechanism according to the present invention will be described.

The drive lever 52 is provided with a slit 523 including a drive holding slit 54 and a drive slit 55, as well as two slits 521 and 522. These two slits 521 and 522 horizontally guide pins 103 and 104, which are integrated into the housing 100, respectively.
In other words, the drive lever 52 can slide horizontally with respect to the housing. A pin 712 (described in detail later) pushes the drive lever 52 to the left, and an elastic member 56 biases the drive lever 52 to the right. The clamper arm 33 and the transmission lever 51 are integrated and can rotate about the rotation shaft 34. A pin 53 is integrally provided on the transmission lever 51, and the pin 53 is guided into a slit 523 provided in the drive lever 52, which includes a drive holding slit 54 and a drive slit 55.

The relationship between the clamper arm 33 and the disc clamper 32 is such that the center portion of the disc clamper 32 is loosely fitted into a circular hole of the clamper arm 33. The disk clamper 32 has diameters a, b, c (c>a>
It has a shape in which the disks of b) are stacked concentrically, and the relationship with the diameter d of the hole in the clamper arm 33 is a>d>b. In order to fit this disc clamper 32 into the clamper arm 33, a hole with a diameter e and having the relationship a<e is made in the clamper arm 33, and this hole and a hole with a diameter d are connected like a snowman. ing.

When installing, insert the disc clamper 32 into the hole with diameter e.
The disk clamper 32 is inserted into the hole with a diameter of d, and is screwed onto the clamper arm 33 to prevent the disk clamper 32 from returning to the hole with a diameter of e. It is attached to the clamper arm 33.

Next, the operation of the disk clamper drive and holding mechanism according to the present invention will be explained. When the aforementioned second detector detects that the disk 11 has reached the position shown in FIG. 2(1), the rotation of the drive roller 12 stops and at the same time the pin 712 begins to move rightward. In the position shown in FIG. 2(1), the drive lever 52 is placed against the pin 71 of the elastic member 56.
2 and is in the position shown in the figure. When the pin 712 moves horizontally to the right in FIG. 3, the drive lever 52 is slid to the right by the bias of the elastic member 56. Then, the pin 53 is guided to the slit of the drive lever 52, so the transmission lever 51 and the clamper arm 33, which are integrated with the pin 53, are lowered, and the disk clamper 32 is also lowered. In FIG. 2(2), the pin 53 is guided by the drive slit 55 and is on its way down. In Figure 2 (3), pin 5
3 is guided to the drive holding slit 54 through the drive slit 55, and as a result, the disk clamper 32
1 is clamped at a predetermined position on the turntable 31. Once clamping is completed, the clamper arm 33 will not descend even if you push it any further, so the clamper arm 3
3 stops descending, leaving enough room for the pin 53 to be guided into the drive holding slit 54, and therefore the drive arm 52 also stops. However, pin 712 still moves to the right, causing pin 712 and drive arm 52 to separate. The purpose of this operation will be described later. The drive holding slit 54 is provided so as to guide the pin 53 in the radial direction of a circle centered on the rotation axis 34 of the clamper arm. Therefore, even if the disk clamper 32 receives a force that lifts it, the direction in which the pin 53 moves is perpendicular to the direction in which the pin 53 is guided.
This force does not lift the disc clamper 32. Further, the drive lever 52 is always pulled to the right in the figure by the elastic member 56, and the direction of this force is not perpendicular to the direction in which the pin 53 is guided, so it can move, and since it is not parallel to it, it can move. The force is disk clamper 3
Acts as a force that lowers 2 downward.

Therefore, the clamping force by the elastic member 56 always acts, and the disc clamper 32 and the turntable 31 are completely clamped together with the force that attracts each other by magnetic force. Also, since the angle formed between the guide direction of the drive slit 55 and the drive direction of the drive lever 52 is larger than that of the drive holding slit 54, the horizontal displacement of the drive lever 52 required to move the disk clamper 32 up and down a predetermined distance is This contributes to the miniaturization of the device.

Finally, a disk clamp mechanism for clamping the disk 11 while appropriately holding it will be described.

The main lever 711 has slits 714 and 715, and guides the pins 102 and 105, which are integrated with the housing, in the horizontal direction in the figure. Therefore, like the drive lever 52, this main lever 711 can also slide in the horizontal direction. The main lever 711 is also screwed integrally with a member provided with a rack (not shown), and is driven left and right in the figure by rotating a pinion gear that meshes with the rack using a motor.

The aforementioned pin 712 is integral with this main lever 711, and the left and right movement of the main lever 711 moves the drive lever 52 left and right in cooperation with the elastic member 56, and as a result, the disk clamper 32 is moved up and down. The main lever 711 is also provided with a slit 713, and this slit 71
3 guides the pin 101 that is integrated with the guide rail 14, so the left and right movement of the main lever 711 also plays the role of moving the guide rail 14 up and down.

As an example, if a slit 713 is provided as shown in FIG. 2 and the relative positional relationship between each lever and pin is determined as shown in the figure, the following operation can be performed. First, Figure 2 (
When the main lever 711 is moved to the right from state 1) to state (2), the guide rail 14 does not move, so there is almost no change in the state sandwiched between the drive roller 12 and the driven roller 13, but the disc clamper 32 descends, one end of the disk 11 descends and is held in contact with the fixed support portion 61. When the main lever 711 moves further to the right from the state shown in FIG. Initially, both ends of the shaft of the driven roller 13 are in the guide groove 15-
1 and 15-2, the driven roller also begins to fall, and finally the disk 11 separates from the driving roller 12,
Driven roller 13, disk clamper 32, and fixed support part 6
Supported by the three points 1, the other end begins to descend. slit 5
By appropriately adjusting the inclination of the disk 23 and the inclination of the slit 713, the disk 11 can be supported at three points with a constant force and guided to the clamp position. When the clamping of the disk 11 is completed, the drive arm 52 becomes immobile and separates from the pin 712 as described above, but the guide rail 14 further descends, thereby causing the driven roller 13 to separate from the disk 11, and finally, as shown in FIG. 3) is reached. This state is detected by a protrusion (not shown) provided on the main lever 711 pressing a first limit switch (not shown), and the driving motor is stopped.

As mentioned above, the operation from insertion of the disk to completion of clamping has been explained, but the operation from unclamping to ejection of the disk simply follows the reverse path, so it will not be explained in detail. The end of the leftward movement of the main lever 711 is detected by a second limit switch (not shown) provided opposite to the first limit switch, and at the same time as the main lever 711 stops, the driving roller 12 starts rotating in the ejection direction.

〔Effect of the invention〕

As described above, although the disk clamper drive and holding mechanism of the present invention is small and has a simple structure, it can obtain a sufficient ramping force, and moreover, the disk clamper can be moved to the insertion/ejection position and clamped with a relatively small driving force. It is possible to move between positions.

[Brief explanation of the drawing]

Fig. 1 is a principle diagram of the present invention, Fig. 2 is a side view showing an embodiment of the invention, and Fig. 3 is a diagram showing the principle of the present invention.
FIG. 4 is a diagram showing a second conventional example. In the figure, 11...Disk, 31...Turntable, 32...Disk clamper, 51...Transmission lever, 52...Drive lever, 53...Bin, 54...Drive holding slit , 55... Drive slit. Principle diagram of the present invention

Claims (1)

[Claims] 1. The disc (11) cooperates with the turntable (31).
) to the recording/playback position.
A disk clamper driving and holding mechanism for moving the disk clamper (32) from a disk insertion/ejection position to a clamping position, holding the disk clamper (32) at the clamping position, and moving the disk clamper (32) from the clamping position to the disk insertion/ejection position. ) is provided with a transmission lever (51) that is integrated with the clamper arm (33), and a drive lever (52) that is driven by a drive means. One of the levers (51; 52) is integrally provided with a pin (53), and the other lever (52; 51) is provided with the pin (53) approximately perpendicular to the moving direction of the transmission lever (51). A disk clamper drive and holding mechanism characterized by being provided with a drive holding slit (54) that guides the drive lever (52) in a direction forming a drive holding angle (α) that is not perpendicular to the driving direction of the drive lever (52). 2. The other lever (52; 51) has a drive slit (for guiding the pin in a direction forming a drive angle (β) larger than the drive holding angle (α) with respect to the drive direction.
55).The disk clamper drive and holding mechanism according to claim 1, further comprising: 55).