JP3045377U - Rotating body with automatic eccentricity correction mechanism and turntable with automatic eccentricity correction mechanism - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a low-cost automatic eccentricity correction mechanism on a rotating body (turntable). [Constitution] Turntable 100 with automatic eccentricity correction mechanism
Is mounted on a turntable 100 on which a removable disk-shaped recording medium (not shown) is mounted or mounted by a driving device (not shown).
It has an annular space 110 formed coaxially with 80 and a balancer 150 that can move in this space 110.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a rotating body with an automatic eccentricity correction mechanism and a turntable with an automatic eccentricity correction mechanism, which is provided with an automatic eccentricity correction mechanism for automatically correcting the rotational shake on a rotating body or turntable that is rotationally driven by a driving device. About.

[0002]

[Prior art]

 A reading device (or a recording / reading device) for a disc-shaped recording medium such as a CD or a DVD has a rotational blur caused by a shift in the center of gravity of the disc-shaped recording medium mounted on the turntable portion, that is, an imbalance. However, there is a limit in the standard because it causes a problem in the data reading (or recording) stage. For example, in the case of a CD, the imbalance standard is determined to be 1 g · cm or less.

Conventionally, in order to fit within the unbalance standard, there has been a method of processing with high accuracy so as to suppress the processing deviation of the center hole of the disk-shaped recording medium, which is a main cause of the deviation of the center of gravity of the disk-shaped recording medium. Has been taken. Further, as a disclosed automatic eccentricity correction apparatus, there is a method disclosed in Japanese Patent Application Laid-Open No. 51-73318. This automatic eccentricity correction device, in short, is a sensor for detecting eccentricity in the turntable part, a movement adjusting mechanism using a bimetal provided on the lower side of the turntable part for correcting eccentricity, and It is provided with a control unit for judging a signal from a sensor or the like and operating a movement adjusting mechanism.

[0004]

[Problems to be solved by the invention]

 However, the conventional method of processing the center hole of a disk-shaped recording medium with high precision cannot meet the demand for a high-speed reading device (or recording / reading device) for the disk-shaped recording medium. In other words, it is necessary to rotate the turntable at a higher speed than in the past, and as the rotation speed increases, the disc-shaped recording medium mounting turntable becomes unbalanced due to the displacement of the center hole of the disc-shaped recording medium, that is, the displacement of the center of gravity. Because the vibration of the part becomes intense, the processing accuracy of the center hole of the disk-shaped recording medium is required to increase the precision in accordance with this high speed, while the disk-shaped recording medium made of flexible material as it is now For media, conventional processing accuracy has already reached its limits.

Further, the center hole of the disk-shaped recording medium is also deformed by thermal and mechanical deformation after the formation of the disk-shaped recording medium, so that the displacement of the center of gravity of the disk-shaped recording medium cannot be avoided.

Further, the automatic eccentricity correction apparatus disclosed in Japanese Patent Application Laid-Open No. 51-73318 has a complicated structure and requires a control unit and the like, so that it becomes expensive.

A main object of the present invention is to provide a low-cost automatic eccentricity correction system capable of suppressing the rotation of the rotator even if the object to be rotated attached to the rotator has a deviation in the center of gravity. An object of the present invention is to provide a rotating body with an automatic eccentricity correcting mechanism, particularly a turntable with an automatic eccentricity correcting mechanism, having a built-in mechanism.

[0008]

[Means for Solving the Problems]

 The rotating body with the automatic eccentricity correcting mechanism according to the present invention has an annular space formed coaxially with the center of rotation and a movable space in the rotating body driven by the driving device. Alternatively, a plurality of balancers are provided.

Therefore, in the case of the rotating body with the automatic eccentricity correcting mechanism according to the present invention, the center of gravity of the object to be rotated attached to the rotating body does not coincide with the center of rotation of the rotating body. When the rotating body with the rotating object starts rotating, the center of rotation of the rotating body, that is, the rotating shaft portion is swung in the direction of the eccentricity of the rotating body with the rotating object, so that the balancer is moved to the annular space. Move in a direction opposite to the eccentricity.

Therefore, if the mass of the balancer is m and the distance between the center of gravity of the balancer and the center of rotation is r, the resultant imbalance = | the imbalance of the object to be rotated−mr | The balancer works so as to reduce the rotation of the rotating body with the object to be rotated.

When the rotating body itself has an imbalance, the combined imbalance = | unbalance of the rotating body with the object to be rotated−mr |. As a result, the combined imbalance is reduced. The balancer works to suppress the rotational shake of the rotating body with the rotating object. Furthermore, when the object to be rotated is not attached to the rotating body, that is, when the rotating body has imbalance in the rotation of the rotating body alone, the composite imbalance = | unbalance of rotating body−mr | As a result, the balancer works so as to reduce the imbalance of the composition, and the rotational blur of the rotating body can be suppressed.

The balancer may be, for example, a sphere, a cylinder, or a cylinder.

The turntable with an automatic eccentricity correcting mechanism according to the present invention is rotatably driven by a driving device, and is formed coaxially with the center of rotation on a turntable on which a removable disk-shaped recording medium is placed or mounted. It is characterized by having an annular space portion and one or a plurality of balancers movable in the space portion.

In the case of the turntable with the automatic eccentricity correcting mechanism according to the present invention, the position of the center of gravity of the disk-shaped recording medium attached to the turntable does not coincide with the rotation center of the turntable. When the turntable with the recording medium starts rotating, the center of rotation of the turntable, that is, the rotating shaft, is swung in the direction of the eccentricity of the turntable with the disc-shaped recording medium, so that the balancer is positioned in the annular space. Inside, it moves in a direction opposite to the eccentricity.

Accordingly, if the mass of the balancer is m and the distance between the center of gravity of the balancer and the center of rotation is r, the composite imbalance = | the imbalance of the disk-shaped recording medium−mr | The balancer works so that the turntable with the disk-shaped recording medium can be prevented from rotating.

If the turntable itself also has imbalance, the composite imbalance = | unbalance of turntable with disk-shaped recording medium−m r |. As a result, the composite imbalance is reduced. The balancer works to suppress the rotational fluctuation of the turntable with the disk-shaped recording medium.

The balancer may be, for example, a sphere, a cylinder, or a cylinder.

[0018]

[Embodiment of the invention]

 An embodiment of a turntable with an automatic eccentricity correcting mechanism according to the present invention will be described with reference to FIGS. FIG. 1 is a schematic exploded perspective view showing an embodiment of a turntable with an automatic eccentricity correcting mechanism according to the present invention, and FIG. 2 is a schematic view showing an embodiment of a turntable with an automatic eccentricity correcting mechanism according to the present invention. FIG. 3 is a schematic perspective view showing another embodiment of the balancer of the turntable with an automatic eccentricity correcting mechanism according to the present invention.

The turntable 100 with an automatic eccentricity correcting mechanism (hereinafter, abbreviated as “turntable 100”) according to the present invention is driven to rotate by a driving device (not shown), and is a removable disk-shaped recording medium. An annular space 110 (see FIG. 2) formed coaxially with the rotation center 180 of the turntable 100 is movable on the turntable 100 on which a (not shown) is placed. And a balancer 150.

In view of the shape, the substantially disk-shaped turntable 100 with a shaft is provided on a substantially disk-shaped portion 120 extending around a substantially cylindrical rotating shaft portion 101, and from the upper surface thereof, the rotating shaft portion 101. Body 100a having an annular groove 121 formed coaxially with a rotation center 180 located at the center of the main body 100a, a flat ring-shaped lid 130 covering an upper portion of the annular groove 121 of the main body 100a, and a main body. It has a space formed by the portion 100a and the lid portion 130, that is, a balancer 150 that can move in the space portion 110.

The upper part of the outer edge of the substantially disk-shaped part 120 is a disk-shaped recording medium mounting base part 120a. Steps 121 a and 121 b for fixing the lid 130 are provided at the upper edge of the annular groove 121. After the balancer 150 is placed in the annular groove 121, the lid 130 is engaged with the steps 121a and 121b so as to cover the upper part of the annular groove 121, and is fixed using fixing means such as an adhesive. . That is, the balancer 150 is accommodated in the space 110 formed between the annular groove 121 and the lid 130.

The space 110 has a space shape formed by rotating a rectangle about a rotation center 180. However, if the balancer 150 can freely move in the space 110, the space 110 is formed by rotating, for example, a trapezoid, an ellipse, or a combination thereof instead of a rectangular shape around the rotation center 180. It is also possible to use a space shape that can be used. The balancer 150 is a sphere. The size of the sphere is smaller than the height of the space 110.

Note that the distance from the rotation center 180 to the center of the balancer 150 is r, the weight of the balancer 150 is m, and the unbalance of the turntable 100 is zero (that is, the turntable 100 has no rotation blur). Balance has been adjusted), and the combined imbalance = | unbalance of disk-shaped recording medium−mr |. In order to make the combined imbalance close to zero, it is desirable that the imbalance of the disc-shaped recording medium is equal to mr. However, in practice, the unbalance of the disc-shaped recording medium is caused by variations in the processing of the disc-shaped recording medium and after processing. Since it fluctuates due to the thermal and mechanical deformation of r, r and m are set so that the fluctuation also results in the target combined imbalance value or less.

When the unbalance of the turntable 100 is not zero, that is, when the balance is not adjusted so that the turntable 100 does not rotate, the combined unbalance = | unbalance of the turntable with a disk-shaped recording medium. Balance-mr |.

In order to make this combined imbalance close to zero, it is desirable that the imbalance of the turntable with the disc-shaped recording medium is equal to mr, but in practice, the unbalance of the disc-shaped recording medium is determined by the processing of the disc-shaped recording medium. The variation due to the above variation and thermal / mechanical deformation after processing, and the unbalance of the turntable varies because the balance is not adjusted so that the turntable 100 does not rotate. Also, r and m are set so as to be equal to or less than the target combined imbalance value.

The operation of the turntable 100 according to the present invention is as follows. First, when the unbalance of the turntable 100 is zero, the following is performed. For example, a CD is placed as a disc-shaped recording medium (not shown) on the turntable 100, and the turntable 100 is started to rotate by a driving device (not shown).

Then, the rotating shaft portion 101 of the turntable 100 is swung in the direction of the center of gravity of the turntable 100 on which the CD is mounted, so that the balancer 150 Move in the opposite direction of your mind. Therefore, the balancer 150 operates so that the composite imbalance = | CD imbalance−mr | is reduced, and the rotational fluctuation of the turntable 100 on which the CD is mounted can be suppressed.

Next, when the unbalance of the turntable 100 is not zero, the following occurs. A CD (not shown) is placed on the turntable 100, and rotation of the turntable 100 is started by a driving device (not shown).

Then, the rotating shaft portion 101 of the turntable 100 is swung in the direction of the eccentricity of the turntable 100 on which the CD is mounted, so that the balancer 150 is displaced inside the annular space 110. Move in the opposite direction of your mind. Therefore, the balancer 150 operates so as to reduce the combined imbalance = | the imbalance of the CD-mounted turntable−m r |, and the rotational shake of the CD-mounted turntable 100 can be suppressed.

Note that even if there are a plurality of balancers 150, each balancer 150 performs the same operation as described above. The balancer 150 is not a sphere, but may be a cylindrical balancer 151 as shown in FIG. The height of the balancer 151 is lower than the height of the space 110.

Further, as shown in FIG. 3B, a cylindrical balancer 152 may be used. The height of the balancer 152 is also lower than the height of the space 110. The balancer 152 may have a size such that the through hole 152a of the balancer 152 is inserted into the rotating shaft portion 101, or may have a size similar to that of the spherical balancer 150 shown in FIG. Good.

Further, the balancer 150 may be a liquid such as mercury instead of the solid as described above.

In the case of a rotating body other than the turntable 100, a rotating object having a deviated center of gravity can be provided by providing a rotating body with an equivalent to the space 110 and the balancer 150. It is clear that the rotation of the attached rotator can be suppressed, and the rotation of the rotator with a shifted center of gravity can be suppressed, and the explanation is omitted.

[0034]

[Effect of the invention]

 As described above, the rotating body with the automatic eccentricity correction mechanism according to the present invention includes a rotating body that is rotationally driven by the driving device, an annular space formed coaxially with the center of rotation, and a movement of the space. And one or more balancers that have become possible.

Therefore, in the case of the rotating body with the automatic eccentricity correcting mechanism according to the present invention, the position of the center of gravity of the object to be rotated attached to the rotating body does not coincide with the rotation center of the rotating body. When the rotating body with the rotating object starts rotating, the center of rotation of the rotating body, that is, the rotating shaft portion is swung in the direction of the eccentricity of the rotating body with the rotating object, so that the balancer is moved to the annular space. Move in a direction opposite to the eccentricity.

Accordingly, if the mass of the balancer is m and the distance between the center of gravity of the balancer and the center of rotation is r, the composite imbalance = | the imbalance of the object to be rotated−mr | The balancer works so as to reduce the rotation of the rotating body with the object to be rotated. Therefore, it is possible to rotate the rotating body with the rotating object at a high speed.

When the rotating body itself has an imbalance, the combined imbalance = | unbalance of the rotating body with the rotating object-mr |, and as a result, the combined imbalance is reduced. The balancer works to suppress the rotational shake of the rotating body with the rotating object. Therefore, the unbalance adjustment of the rotating body itself can be omitted.

Further, when the object to be rotated is not attached to the rotating body, that is, when the rotating body has imbalance in the rotation of only the rotating body, the combined imbalance = | unbalance of rotating body−mr As a result, the balancer works so as to reduce the composite imbalance, and the rotational fluctuation of the rotating body can be suppressed.

The turntable with an automatic eccentricity correcting mechanism according to the present invention is formed by driving a rotation device, and is formed coaxially with the center of rotation on a turntable on which a removable disk-shaped recording medium is placed or mounted. It is characterized by having an annular space portion and one or a plurality of balancers movable in the space portion.

In the case of the turntable with an automatic eccentricity correcting mechanism according to the present invention, the position of the center of gravity of the disk-shaped recording medium attached to the turntable does not coincide with the rotation center of the turntable. When the turntable with the recording medium starts rotating, the center of rotation of the turntable, that is, the rotating shaft, is swung in the direction of the eccentricity of the turntable with the disc-shaped recording medium, so that the balancer is positioned in the annular space. Inside, it moves in a direction opposite to the eccentricity.

Therefore, if the mass of the balancer is m, and the distance between the center of gravity of the balancer and the center of rotation is r, the composite imbalance = | the imbalance of the disk-shaped recording medium−mr | The balancer works so that the turntable with the disk-shaped recording medium can be prevented from rotating. Thus, the turntable with the disk-shaped recording medium can be rotated at a high speed. That is, data reading and data writing from the disk-shaped recording medium can be speeded up.

If the turntable itself also has imbalance, the composite imbalance = | unbalance of turntable with disk-shaped recording medium−m r |, so that the composite imbalance is reduced. The balancer works to suppress the rotational fluctuation of the turntable with the disk-shaped recording medium. Therefore, the unbalance adjustment of the turntable can be omitted.

The balancer may be, for example, a sphere, a cylinder, or a cylinder. Therefore, since the automatic eccentricity correcting mechanism has a simple structure, it can be provided on a target rotating body or a turntable at low cost.

[Brief description of the drawings]

FIG. 1 is a schematic exploded perspective view showing an embodiment of a turntable with an automatic eccentricity correcting mechanism according to the present invention.

FIG. 2 is a schematic sectional view showing an embodiment of a turntable with an automatic eccentricity correcting mechanism according to the present invention.

FIG. 3 is a schematic perspective view showing another embodiment of the balancer of the turntable with the automatic eccentricity correcting mechanism according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 Turntable with automatic eccentricity correction mechanism 100a Main body 101 Rotation shaft 110 Space 110a Outer edge 121 Annular groove 121a, 121b Step 130 Cover 130 Balancer 180 Rotation center

Claims (4)

[Utility model registration claims] 1. A rotating body rotatably driven by a driving device has an annular space formed coaxially with a center of rotation, and one or more balancers movable in the space. A rotating body with an automatic eccentricity correction mechanism characterized by the following. 2. The rotating body with an automatic eccentricity correcting mechanism according to claim 1, wherein the balancer is a sphere, a cylinder, or a cylinder. 3. An annular space formed coaxially with the center of rotation on a turntable on which a removable disk-shaped recording medium is mounted or mounted by being rotated by a drive device, and the space can be moved. A turntable with an automatic eccentricity correcting mechanism, comprising one or more balancers. 4. The turntable with an automatic eccentricity correcting mechanism according to claim 3, wherein the balancer is a sphere, a cylinder, or a cylinder.