JP4116993B2 - Disk drive device - Google Patents

Description

  The present invention relates to a disk drive device that rotationally drives a recording disk such as a CD (Compact Disk) or a DVD (Digital Versatile Disk).

  A conventional disk drive device is configured, for example, as shown in FIG. The disk drive device includes a turntable 10 and a drive motor 20 formed of metal or resin mold. The turntable 10 includes a disc support ring portion 11, a disc set ring portion 12 and a support portion 13 which are formed concentrically. A shaft hole 14 penetrating the support portion 13 is formed at the center of the support portion 13.

  In the drive motor 20, a rotary shaft 25 is rotatably supported by a metal bearing 23 fixedly supported by a bearing support portion 22 formed at the center of the frame 21. The rotating shaft 25 is fixed to the rotor 24, and the rotating shaft 25 is rotated by the rotation of the rotor 24 by the electromagnetic action of an electromagnetic circuit member (not shown). The drive motor 20 is fixedly supported by a support member (not shown) so as to be positioned on the lower side of the drive chassis 100, and the rotation shaft 25 is formed on the support portion 13 of the turntable 10 positioned on the upper side of the drive chassis 100. The shaft hole 14 is press-fitted.

  In the disk drive device having such a structure, the turntable 10 is arranged such that the center hole of the recording disk (CD, DVD, etc.) is fitted into the disk set ring part 12 and the disk surface is supported by the disk support ring part 11. The recording disk is set on the top. In this state, the turntable 10 is rotated by the rotation of the rotating shaft 25 of the drive motor 20. An optical pickup unit (not shown) reads information from a recording disk that rotates as the turntable 10 rotates.

  By the way, since the turntable 10 is rotationally supported by the rotating shaft 25 of the drive motor 20 press-fitted into the shaft hole 14 of the support portion 13, the turntable 10 is caused by a drop impact during transportation of the disk drive device. If inertial force or external force is applied to the turn table 10, the turntable 10 may shift to the drive motor 20 side. If the deviation amount is large and the turntable 10 comes into contact with another member located on the drive motor 20 side, for example, the drive chassis 100, the rotation of the turntable 10 is hindered.

In order to solve such a problem, a stopper (locking piece) having a communication hole for closing the tip of the shaft hole 14 of the turntable 10 and communicating the shaft hole 14 with the outside is provided. A structure has been proposed in which the rotary shaft 25 is press-fitted into the shaft hole 14 until the tip thereof abuts against the stopper (see, for example, Patent Document 1). According to such a structure, since the tip of the rotary shaft 25 of the drive motor 20 press-fitted into the shaft hole 14 of the turntable 10 is in contact with the stopper, the turntable is caused by a drop impact or the like during conveyance of the disk drive device. Even if an inertial force or an external force is applied to 10, the turntable 10 does not shift to the drive motor 20 side.
JP-A-6-131784

  However, in the conventional disk drive device as described above, the tip of the rotating shaft 25 of the drive motor 20 is in contact with the stopper that closes the shaft hole 14, so that the press-fitting of the turntable 10 that is rotatably supported by the rotating shaft 25 is performed. Depth and surface runout accuracy depend on the position accuracy and finish accuracy of the end face of the stopper.

  The present invention has been made to solve such a conventional problem. The turntable can be rotationally supported by the rotating shaft of the drive motor without affecting the surface runout and the like, and the drop impact can be achieved. It is an object of the present invention to provide a disk drive device having a structure in which the amount of displacement of the turntable toward the drive motor becomes as small as possible when an external force such as the above is applied.

A disk drive device according to the present invention includes a turntable having a support portion formed with a shaft hole in a central portion, and a rotation shaft that is press-fitted into the shaft hole of the support portion of the turntable and supports the turntable. A drive motor, and an optical pickup unit used for reading information from a recording disk set on the turntable, wherein the support portion of the turntable has the tip at the tip A stopper portion having a communication hole for closing the shaft hole and communicating the shaft hole with the outside is formed, and a first gap is formed between the tip of the rotating shaft of the drive motor and the stopper portion. the rotation shaft in a state that has been press-fitted is press-fitted into the shaft hole, said first gap, wherein the the portion located between the turntable and the drive motor Wherein becomes a turntable-side surface, a smaller configuration than the second gap is a gap between the drive motor side surface of the turntable facing the axial direction of the rotary shaft with respect to the plane of.

According to such a configuration, in the state where the rotation shaft of the drive motor is press-fitted into the shaft hole formed in the support portion of the turntable, the first gap is provided between the tip portion of the rotation shaft and the stopper portion. Therefore, the processing accuracy of the stopper portion does not affect the turntable support (surface runout) by the rotating shaft. Even if the turntable is displaced to the drive motor side due to a drop impact or the like, the tip of the rotation shaft of the drive motor will abut against the stopper portion, so the amount of displacement is between the tip of the rotation shaft and the stopper portion. Even if the turntable does not exceed the first gap formed in the meantime and the turntable is displaced until the tip of the rotating shaft of the drive motor hits the stopper due to a drop impact or the like, the turntable The state which does not interfere with rotation of a turntable by contacting the member arrange | positioned between a drive motor and a drive motor can be maintained.

  Further, in the disk drive device according to the present invention, the first gap is configured to be smaller than a reading position adjustment allowable range in a direction perpendicular to a recording disk surface set on the turntable of the optical pickup unit. it can.

  With this configuration, even if the turntable is displaced until the tip of the rotating shaft of the drive motor hits the stopper due to a drop impact or the like, information can be read from the recording disk set on the turntable by the optical pickup unit. A possible state can be maintained.

  According to the disk drive device of the present invention, the processing accuracy of the stopper portion formed so as to close the shaft hole of the turntable does not affect the support accuracy of the turntable by the rotating shaft, and the drop impact Even if the turntable is displaced toward the drive motor due to the above, the amount of displacement does not exceed the first gap formed between the tip of the rotating shaft and the stopper portion. The amount of deviation toward the drive motor can be minimized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  A disk drive device according to an embodiment of the present invention is configured as shown in FIGS. FIG. 1 is a partially sectional perspective view, and FIG. 2 is a sectional view.

  1 and 2, the disk drive device is formed of a metal or a resin mold and has a disk support ring portion 11, a disk set ring portion 12, and a support portion 13 as in the case shown in FIG. And a drive motor 20. A shaft hole 14 continuing from the back surface of the turntable 10 is formed at the center of the support portion 13, and a communication hole 13 b that closes the shaft hole 14 and communicates the shaft hole 14 with the outside is formed at the tip of the support portion 13. The formed stopper portion 13a is formed.

  As in the case shown in FIG. 3, the drive motor 20 is rotatable by a metal bearing 23 in which a rotary shaft 25 fixed to the rotor 24 is fixedly supported by a bearing support portion 22 formed at the center of the frame 21. It is supported by. And the rotating shaft 25 rotates by rotation of the rotor 24 by the electromagnetic effect | action of an electromagnetic circuit member (not shown). The drive motor 20 is fixedly supported by a support member (not shown) so as to be positioned below the drive chassis 100. Further, the rotary shaft 25 has a first gap ΔB formed in the shaft hole 14 formed in the support portion 13 of the turntable 10 located on the upper side of the drive chassis 100 between the tip and the stopper portion 13a. It is press-fitted in the state. In addition, since the communication hole 13b is formed in the stopper portion 13a that closes the shaft hole 14, the rotary shaft 25 can be easily press-fitted into the shaft hole 14.

  The recording disk DK is set on the turntable 10 so that the center hole of the recording disk (CD, DVD, etc.) DK is fitted in the disk set ring part 12 and the disk surface is supported by the disk support ring part 11. The In this state, the turntable 10 is rotated by the rotation of the rotating shaft 25 of the drive motor 20.

  As described above, the optical pickup unit 30 is provided so as to be positioned below the recording disk DK set on the turntable 10. The optical pickup unit 30 is supported by the support mechanism 40 so as to be movable in the radial direction of the turntable 10. The optical pickup unit 30 has an objective lens 32 supported by a lens holder 31, and information recording light (laser light) is irradiated onto the recording surface of the recording disk DK via the objective lens 32 and reflected therefrom. Light is taken into the optical pickup unit 30 through the objective lens 32. As a result, the optical pickup unit 30 reads information from the recording disk DK that rotates as the turntable 10 rotates.

  The optical pickup unit 30 includes an actuator mechanism that slightly moves the objective lens 32 forward and backward in a direction (focus direction) perpendicular to the recording surface of the recording disk DK via the lens holder 31. Thus, the focal position of the laser beam in the direction perpendicular to the recording surface of the recording disk DK can be adjusted. The advance / retreat range of the objective lens 32 corresponds to a reading position adjustment (focus adjustment) allowable range ΔC in a direction perpendicular to the recording surface of the recording disk DK.

  The first gap ΔB between the tip of the rotating shaft 25 of the drive motor 20 press-fitted into the shaft hole 14 of the turntable 10 and the stopper portion 13 a that closes the shaft hole 14 is formed between the turntable 10 and the drive motor 20. A member disposed therebetween, in this case, smaller than the second gap ΔA between the drive chassis 100 and the turntable 10 (ΔB <ΔA), and the recording surface of the recording disk DK of the optical pickup unit 30 described above Is set to be smaller (ΔB <ΔC) than the reading position adjustment allowable range ΔC in the direction perpendicular to.

  In a state where the rotating shaft 25 of the drive motor 20 is press-fitted into the shaft hole 14 formed in the support portion 13 of the turntable 10, a first portion is provided between the tip of the rotating shaft 25 and the stopper portion 13 a that closes the shaft hole 14. Since there is a gap ΔB, the stopper portion 13a does not affect the support of the turntable 10 by the rotating shaft 25. That is, since the stopper portion 13a and the tip of the rotating shaft 25 do not contact at the time of assembly, even if the processing accuracy and surface roughness of the end surface of the stopper portion 13a (the surface facing the tip of the rotating shaft 25) are rough, The turntable 10 will not run out due to the roughness of the end surface finishing accuracy. Further, the press-fit (height) position of the turntable 10 is not affected by the processing accuracy of the end face of the stopper portion 13a, and can be accurately maintained and managed by a gauge or the like.

  Even if the turntable 10 is displaced toward the drive motor 20 when an external force such as a drop impact is applied, the tip of the rotary shaft 25 of the drive motor 20 abuts against the stopper portion 13a. It does not exceed 1 gap ΔB. Furthermore, even if the turntable 10 is displaced by the first gap ΔB, the first gap ΔB is smaller than the second gap ΔA between the turntable 10 and the drive chassis 100. Does not come into contact with the drive chassis 100 and does not interfere with the rotation of the turntable 10. Further, since the first gap ΔB is smaller than the reading position adjustment allowable range ΔC in the direction perpendicular to the recording surface of the recording disk DK set on the turntable 10 of the optical pickup unit 30, information from the recording disk DK is obtained. It will not be impossible to read.

  If the amount of deviation of the turntable 10 toward the drive motor 20 when an external force such as a drop impact is applied does not reach the first gap ΔB, the turntable 10 is affected by the stopper portion 13a. Therefore, the state of being supported by the rotating shaft 25 of the drive motor 20 is maintained, and the surface shake of the turntable 10 does not occur. Then, when the optical pickup unit 30 performs reading position adjustment (focus adjustment) in a direction perpendicular to the recording surface of the recording disk DK set on the turntable 10, normal information can be read from the recording disk DK. Can be done continuously.

  As described above, the disk drive device according to the present invention can support the turntable on the rotating shaft of the drive motor without the processing accuracy of the turntable affecting surface runout and the like, and When an external force such as a drop impact is applied, the structure is such that the amount of displacement of the turntable toward the drive motor becomes as small as possible, and when the information is read from a recording disk such as a CD or DVD (Digital Versatile Disk) It is useful as a disk drive device for rotating a disk.

1 is a partially sectional perspective view showing a structure of a disk drive device according to an embodiment of the present invention. 1 is a cross-sectional view showing a structure of a disk drive device according to an embodiment of the present invention. It is a partial cross section perspective view which shows the structural example of the conventional disk drive apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Turntable 11 Disc support ring part 12 Disc set ring part 13 Support part 13a Stopper part 13b Communication hole 14 Shaft hole 20 Drive motor 21 Frame 22 Bearing support part 23 Metal bearing 24 Rotor 25 Rotating shaft 30 Optical pick-up unit 40 Support mechanism 100 Drive chassis

Claims (2)

A turntable having a support portion formed with a shaft hole in the center,
A drive motor having a rotating shaft that is press-fitted into a shaft hole of the support portion in the turntable and that supports the turntable in rotation;
A disk drive device comprising an optical pickup unit used for reading information from a recording disk set on the turntable;
The support portion of the turntable has a stopper portion formed with a communication hole that closes the shaft hole and communicates the shaft hole with the outside at the tip thereof.
The rotary shaft is press-fitted into the shaft hole in a state where a first gap is formed between the tip of the rotary shaft of the drive motor and the stopper portion ;
The first gap includes a surface on the turntable side of a member disposed between the turntable and the drive motor, and the drive of the turntable facing the surface in the axial direction of the rotation shaft. A disk drive device characterized in that it is smaller than a second gap which is an interval with a surface on the motor side . 2. The disk drive device according to claim 1, wherein the first gap is smaller than a reading position adjustment allowable range in a direction perpendicular to a recording disk surface set on the turntable of the optical pickup unit .

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