JP2000173141A - Recording medium rotating mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording medium rotating mechanism which is capable of suppressing the influence of the uneven centroid of the recording medium at the time of high-speed rotation with the easy attaching and detaching mechanism of the recording medium which does not require more than needed force for an operator and a simple structure even with a device for rotating the disk-shaped recording medium, such as a compact disk, at a high speed. SOLUTION: This rotating mechanism has a turntable 17 on which the disk- shaped recording medium 15 is placed and a drive mechanism 19 which rotationally drives this turntable 17 and is characterized in that the turntable 17 is provided with plural fixing means 16 for fixing the peripheral edge of the recording medium 15 to the turntable 17 and aligning the center of the recording medium 15 with the center of rotation of the turntable 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium rotating mechanism used for a recording / reproducing apparatus for recording and reading information on a disk-shaped recording medium represented by a compact disk.

[0002]

2. Description of the Related Art Conventionally, in a rotating mechanism of a disk-shaped recording medium (including a recording medium in a cartridge such as a magneto-optical disk medium, hereinafter simply referred to as a recording medium) represented by a compact disk, a recording mechanism is used. A fixing structure for holding the medium at a predetermined position is required, and is generally performed by sandwiching the center of the recording medium, which is also the center of rotation of the recording medium, from both sides in some form.

As one conventional example, as shown in FIG.
There is known a structure in which a rotation motor 3 as a driving mechanism having a clamp table 2 is pushed up from below the recording medium 1 and the recording medium 1 is pressed directly onto a clamp pulley 4 fixed above and clamped.

As another conventional example, as shown in FIG. 5, a recording medium 5 is attached to a rotating motor 6 in a general recording medium fixing structure mainly used in portable information equipment and the like. There is also known a structure in which a recording medium 5 is pressed against a clamp table 7 by being placed on a clamp table 7 and a spring 9 in a clamp machine 8 pushing a medium pressing claw 10.

[0005]

However, such a conventional technique has the following problems to be improved. The first problem is that these fixing structures are located near the center of the recording media 1.5, between the clamp base 2 and the clamp pulley 4 in the former, and between the clamp base 7 and the clamp base 7 in the latter. The recording medium 1 is clamped between the recording medium 1 and the clamp pulley 4 or the clamp base 2 and the recording medium 1 or the frictional force between the clamp table 7 or the clamp unit 8 and the recording medium 5. 5 is fixed. However, when rotating the recording media 1.5 at a high speed, it is necessary to fix the recording media 1.5 with a force greater than the torque required for the rotation motor to rotate the recording media 1.5. There is a problem that there is. When such a problem occurs, in particular, in the case of the structure shown in FIG. 5, since all the force of the spring 9 for pushing out the claws 10 cannot be used for the pressing force against the clamp table 7, this part is placed directly above the clamp base 7. While a spring that is stronger than the force required to press down from below is required, when the recording medium 5 is attached or detached, the medium holding claw 10 pushed out by the spring 9 is pushed in. It is necessary to remove all of the pressing force of the medium pressing claw 10 when removing the recording medium 5 in particular. Therefore, there is a problem that the user uses extra force for attaching and detaching the recording medium 5.

A second problem is that when the center of gravity of the recording mediums 1 and 5 is deviated from the center of rotation, the center of gravity is easily affected by the eccentricity, and vibration is generated with the rotation of the recording medium. In the end. This is because each of the rotating systems
As schematically shown in FIG. 6, the rotary bearing (in the motor) 11
And the rotating shaft 12 and the mass 13 corresponding to the eccentricity.
As the distance 14 between 1 and the mass 13 corresponding to the eccentricity increases, the influence of the eccentricity increases, and as a result, the whirling increases, and rotational vibration occurs.

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem. Even in an apparatus which needs to rotate a disk-shaped recording medium such as a compact disk at a high speed, an operator can exert an unnecessary force. It is an object of the present invention to provide a recording medium rotating mechanism capable of suppressing the influence of the eccentricity of the recording medium during high-speed rotation with a simple environment in which a recording medium can be easily attached and detached and that is not required.

[0008]

According to a first aspect of the present invention, there is provided a recording medium rotating mechanism comprising: a turntable on which a disk-shaped recording medium is placed;
A drive mechanism for driving the turntable to rotate,
The turntable is provided with a plurality of fixing means for fixing a peripheral portion of a previous recording medium to the turntable and aligning a center of the recording medium with a rotation center of the turntable. . According to a second aspect of the present invention, in the recording medium rotating mechanism according to the first aspect, the fixing unit slides on the case fixed to the turntable along a radial direction of the turntable. It is characterized by comprising a medium pressing claw that is freely mounted, and a spring that constantly springs the medium pressing claw toward the center of the turntable. According to a third aspect of the present invention, there is provided a recording medium rotating mechanism,
3. The device according to claim 2, wherein at least a portion of the medium holding claw facing the turntable is formed as an inclined surface gradually separated from the turntable as it goes toward the center of the turntable. . According to a fourth aspect of the present invention, there is provided a recording medium rotating mechanism according to any one of the first to third aspects, wherein the turntable is rotatably supported near an outer peripheral portion of the turntable in a state where the turntable is positioned. A vessel is provided. The recording medium rotating mechanism according to a fifth aspect of the present invention is the recording medium rotating mechanism according to any one of the first to fourth aspects.
The drive mechanism is connected to an outer peripheral surface of the turntable. Further, a recording medium rotating mechanism according to a sixth aspect of the present invention is the recording medium rotating mechanism according to any one of the first to fourth aspects, wherein the outer peripheral edge of the turntable has the same central axis as the rotation axis of the turntable. A skirt is formed, and the driving mechanism is connected to an inner peripheral surface of the skirt.

When the recording medium is fixed in a detachable manner and rotated, and when there is no engagement like a gear, a pressing force of a clamper or the like for fixing to the center of the recording medium is used. It will be fixed using frictional force. The location where the pressing force is applied is more required as the position is closer to the rotation center of the recording medium, and becomes smaller as the position is farther from the rotation center. In particular, in the prior art shown in FIG. 5, in the case of a compact disc, the compact disk is fixed at an inner peripheral portion having a diameter of about 15 mm. In order to obtain the same fixing force, a pressing force of about 1/6 is enough. In the case where the recording medium is fixed at the outer peripheral portion, a turntable having a size larger than the outer diameter of the recording medium is required. Since the turntable and the recording medium need to rotate together, the moment of inertia of the rotating body increases, and the rotating shaft torque required for driving increases, but the rotational force is applied to the outer periphery of the turntable. By taking this method, the torque required for the drive motor itself is reduced. In addition, by giving a predetermined weight to the turntable that rotates integrally with the recording medium, the influence of the eccentricity of the recording medium during rotation can be reduced, and as a result, vibration can be suppressed.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows the configuration of the present embodiment from above the turntable. A recording medium 15 and a medium presser 16 (3 in this figure) as fixing means for fixing the recording medium 15
Base), a turntable 17 to which the recording medium 15 is fixed, a turntable supporter 18 (three units in FIG. 1) rotatably supporting the turntable 17, and the above-mentioned. It comprises a drive motor section 19 for driving the turntable 17 to rotate. The medium presser 16 is fixed on a turntable 17. The turntable 17 has an annular guide groove 20 for a turntable support 18, and its center line is the turntable 1.
The recording medium 15 is rotated by applying rotation to the outer periphery of the turntable 17 by the medium driving motor unit 19.

FIG. 2 is a sectional view taken along line AA of FIG. The medium presser 16 is slidably mounted on the medium press case 21 and the medium press case 21 along the radial direction of the turntable 17, and extends from the medium press case 21 toward the center of the turntable 17. A medium pressing claw 22 that can be protruded, and a spring 23 that elastically presses the medium pressing claw 22 toward the center of the turntable 17.
It is composed of And the medium holding claw 22 is
The tip portion is formed in a truncated cone shape, and as shown in FIG. 2, the outer peripheral edge of the recording medium 15 is pressed against the turntable 17 by using the inclined surface.

The turntable support 18 is provided on the upper and lower surfaces of the outer periphery of the turntable 17 and the turntable 1.
7 are provided at three places separated by a predetermined angle in the rotation direction of the turntable 7 and comprise a turntable support case 24 and a support hard ball 25 rotatably mounted on the turntable support case 24. The supporting hard ball 25 of
The turntable 17 is rotatably supported by being rotatably engaged with the guide groove 20 of the turntable 17. Then, the turntable support case 24 is fixed to the side of a reading device such as a compact disk drive provided with this mechanism.

The drive motor unit 19 includes a drive motor 26
And a driving force transmitting roller 27 integrally attached to a driving shaft of the driving motor 26. The driving force transmission roller 27 is in contact with the outer peripheral surface of the turntable 17 so that the driving force of the driving motor 26 can be transmitted to the turntable 17.

Next, the operation of the embodiment constructed as described above will be described. As shown in FIG. 2, the medium pressing claw 22 is inclined. This medium holding claw 22
Is pushed out by the spring 23 to press the recording medium 15 against the turntable 17. The pressing force may be such that the recording medium 15 can be rotated without slipping on the turntable.
Since the force is applied to the outer peripheral side of the recording medium 15, it is possible to obtain the same effect as in the case of applying to the inner peripheral side, and to reduce the force. Further, there is also an action of simultaneously pushing the recording medium 15 in the direction of the center of rotation of the recording medium 15, and a force for pushing out in the center direction by arranging three or more medium pressers 16 at positions along the outer periphery of the recording medium 15 at equal intervals. Is balanced, and the rotation of the recording medium 15 is centered. Thereby, the recording medium 15 and the turntable 17 become one rotating body.

As shown in FIG. 2, the turntable 17 is sandwiched by a plurality of turntable supports 18 arranged above and below the turntable 17, and the supporting hard balls 25 are provided with guide grooves. 20, it is possible to support the recording medium 15 in both the horizontal direction and the vertical direction by using the turntable supporters 18 in three or more sets on one side from both sides. When the recording medium 15 has an eccentric center, the support of the rotating body is
The rotation is performed at a plurality of locations on the outer peripheral side of the rotating body, and since the distance between the center of gravity of the rotating body and the support point is small, whirling as shown in FIG. Is also less likely to occur.

Further, by providing the turntable 17 with a certain weight, the imbalance as the rotating body is reduced, and the generation of vibration during rotation can be suppressed.

When the weight of the rotating body increases in such a manner, a driving force is required more than before, but FIGS.
As shown in (2), since the driving force is applied from the outer peripheral side of the turntable 17, the turntable 17 can be rotated with a smaller force than applying the driving force to the center.

FIG. 3 shows another embodiment of the present invention in which the configuration of FIG. 1 is modified. To elaborate,
The turntable 32 has a shape in which the central portion is greatly hollowed out from the turntable 17 shown in the above embodiment. In the case of the turntable of FIG.
Needs to be mounted with the recording surface facing upward in the drawing. In the case of the turntable 32 of this embodiment shown in FIG.
Since a hole is formed so as to cover only the edge portion of the recording medium 15, the recording surface can be used either above or below. The turntable support 28 is provided with the support hard ball 2 shown in FIG.
5 is changed to a supporting roller 29, and accordingly, the shape of the turntable support case 30 and the guide groove 31 is also changed, but the function is the same as that of FIG. is there. In the drive motor unit 33, the drive force transmission roller 35 mounted on the drive motor 34 is brought into contact with the inner peripheral surface of the turntable 32, and the portion other than the outermost periphery is close to the outer peripheral portion of the turntable 32. At the position, a turning force is applied to the turntable 32. In this configuration,
When the driving position is closer to the center, the driving force needs to be increased, but since there is a distance from the center of rotation, the driving force is smaller than the driving force at the center.

The various shapes, dimensions, and the like of the components shown in the above embodiments are merely examples, and can be variously changed based on design requirements and the like.

[0020]

Since the present invention is configured as described above, the following effects can be obtained. The first effect is that the user can attach and detach the recording medium lightly. The reason is that the fixing of the recording medium is performed by pressing the outer peripheral portion of the recording medium, so that the force for pressing the recording medium can be reduced. The second effect is that higher-speed rotation can be performed than in the conventional method. The reason is the first
Since the method of fixing the outer peripheral portion of the recording medium is employed similarly to the effect of the above, since the arrangement of the medium presser can be more performed,
If necessary, the fixing force of the recording medium can be further increased. Also, the swing of the turntable can be reduced by supporting the turntable on the outer peripheral portion and suppressing the influence of the eccentricity of the recording medium by giving the turntable a certain weight.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is a plan view of a main part showing another embodiment of the present invention.

FIG. 4 is a side view of a main part showing one conventional example.

FIG. 5 is a partial longitudinal sectional side view of a main part showing another conventional example.

FIG. 6 is a schematic diagram for explaining rotational runout in the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 (Disc-shaped) recording medium 2 Clamp table 3 Rotation motor 4 Clamp pulley 5 Recording medium 6 Rotation motor 7 Clamp table 8 Clamping machine 9 Spring 10 Medium holding claw 11 Rotation bearing part 12 Rotation axis 13 Mass 14 Distance 15 Recording medium Reference Signs List 16 medium presser (fixing means) 17 turntable 18 turntable supporter 19 drive motor unit 20 guide groove 21 medium presser case 22 medium presser claw 23 spring 24 turntable supporter case 25 support hard ball 26 drive motor 27 drive Force transmission roller 28 Turntable support 29 Supporting roller 30 Turntable support case 31 Guide groove 32 Turntable 33 Driving motor 34 Drive motor 35 Driving force transmission roller

Claims (6)

[Claims] 1. A turntable on which a disk-shaped recording medium is placed, and a drive mechanism for rotating the turntable, wherein a peripheral portion of a preceding recording medium is fixed to the turntable. And a plurality of fixing means for aligning the center of the recording medium with the rotation center of the turntable. 2. The device according to claim 1, wherein the fixing means includes a case fixed to the turntable, and a medium pressing claw slidably mounted on the case along a radial direction of the turntable. A recording medium rotating mechanism comprising: a spring that constantly repels the medium pressing claw toward the center of the turntable. 3. The medium holding claw according to claim 2, wherein at least a portion of the medium holding claw facing the turntable is formed as an inclined surface gradually separated from the turntable as it goes toward the center of the turntable. A recording medium rotating mechanism, characterized in that: 4. The device according to claim 1, wherein a supporter is provided near an outer peripheral portion of the turntable to rotatably support the turntable in a positioned state. Recording medium rotating mechanism. 5. The recording medium rotating mechanism according to claim 1, wherein the driving mechanism is connected to an outer peripheral surface of the turntable. 6. A skirt having the same central axis as the rotation axis of the turntable is formed on the outer peripheral edge of the turntable according to any one of claims 1 to 4,
The recording medium rotating mechanism, wherein the driving mechanism is connected to an inner peripheral surface of the skirt.