JPH0855421A - Disk rotating drive device - Google Patents

Abstract

PURPOSE:To enable a disk to rotate in a plane and to reproduce the stable disk by reinforcing the strength of a rotary spindle of a spindle motor and straightening the spindle. CONSTITUTION:When the disk 27 is raised from its placing recessed part 31 of a carriage 17, a surface opposite to a recording surface of the disk 27 is brought into contact with a lower surface of a clamper 50. Moreover, when a turntable 33 is raised, a magnet 52 is separated from a magnetic plate 55 to bring the disk 27 to its clamping position. Under this state, the spindle motor 43 is rotated, and the disk 27 is rotated at a prescribed revolving speed, and also recorded information on the disk 27 is reproduced by emitting a laser beam from a pickup 34. Then, since a metal shaft 45 is force-fitted onto the rotary spindle 44, the disk 27 can stably be rotated without deflection of the rotary spindle 44 due to eccentricity of the disk 27 and a manufacturing error of the roatry spindle 44 of the motor 45.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk rotation driving device for rotating a disk, and more particularly to a disk rotation driving device capable of rotating the disk in the same plane without shaking.

[0002]

2. Description of the Related Art When reproducing information recorded on a disc, the disc is placed on a turntable, the turntable is rotated by a spindle motor while the disc is clamped by a clamper, and a laser beam is emitted from a pickup. To obtain a reproduction signal.

[0003]

In this case, when the disc is eccentrically clamped with respect to the turntable,
Since the center of gravity of the rotating disk does not coincide with the rotation axis of the spindle motor, the turntable receives a pestle-like force. In this case, if the strength of the rotating shaft is weak, the disc does not rotate in one plane, and in the worst case, the disc cannot be reproduced.

If the rotation axis of the spindle motor is not aligned due to a manufacturing error and is slightly bent, the disk does not rotate in one plane but rotates like a pestle, and Adversely affects the reproduction of.

[0005]

A turntable on which a disk is placed, a spindle motor having a turntable fixed to one end of a rotation shaft thereof and driving the turntable to rotate, and a position between the turntable and the spindle motor. And a reinforcing member fixed to the rotating shaft.

[0006]

The reinforcing member corrects the rotating shaft so that it is linear.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the present invention is applied to a changer type disc reproducing apparatus 1 will be described below. 3 and 4 are a top view and a right side view of the disc reproducing apparatus 1,
7 carriages 1 each carrying one disc
1 to 17 can be stored in a stack, and the stocker 10 that can move in the vertical direction with respect to the paper surface of FIG. 3 is located at the uppermost position, and the carriage 17 stored at the lowermost stage is pulled out from the stocker 10 and is in the reproduction position. Shows the state. For the sake of explanation, the eject position where the tray 18 is located outside the disc reproducing apparatus 1 with the carriage 17 accommodated in the tray 18 is also shown.

The tray 18 is provided with two flanges 19. When the carriage 17 is housed in the tray 18, the upper surface of the flange 19 has a mounting recess for the carriage 17 so as to make up for the notch 30 of the carriage 17. It is formed on the same level as the upper surface of 31 and protrudes from the tray 18. Since the mounting recess 31 is formed with a depth substantially equal to 1.2 mm of the thickness of the disk 27 shown by the dotted line, the mounting recess 31 has the same shape as the upper surface of the disk 27 in the state where the disk 27 is mounted on the mounting recess 31. The height of the upper surface of the carriage 17 becomes equal.

Since the notch 30 is formed large in the carriage 17 on which the disc 27 is placed, it becomes unstable when the disc 27 is placed on the carriage 17 at the eject position. However, on the tray 18, the flange 1 is formed so as to be continuous with the mounting recess 31 of the carriage 11.
Since 9 is formed, the support of the disc 27 at the eject position becomes more reliable.

The disk 27, which is mounted on the carriage 17, moves at four positions A to D on a horizontal plane.
That is, in a state where the carriage 17 is housed in the tray 18, the tray 18 is located at the eject position A where the tray 18 projects in front of the disc reproducing apparatus 1, and the tray 18 is located at the loading position B and the loading position where the tray 18 is accommodated in the disc reproducing apparatus 1. The carriage 17 is pulled out from a certain tray 18, and the carriage 1
Four positions, that is, a reproduction position C for reproducing the disk 27 on the recording medium 7 and a stock position D for storing the carriage 17 in the stocker 10 are moved.

Therefore, when reproducing the disc 27 on the carriage 17 at the eject position, the tray 18 is moved from the eject position to the load position by a tray moving mechanism (not shown) including a motor and the like, and the disc 27 is moved.
Is moved from the eject position A to the load position B. After the tray 18 is brought to the loading position, the carriage 1
7 is a carriage moving mechanism (not shown) including a motor and the like.
The disk 27 is moved from the loading position B to the reproducing position C by being pulled out from the tray 18 by. At the reproducing position C, the disc 27 is reproduced by the optical mechanism 2 described later.

The disk 27 located at the reproducing position C and the disks 21 to 21 housed in the stocker 10 are
26 is overlapped with 26 in a plane and contributes to downsizing of the reproducing apparatus 1.

When the disk 27 is stored in the stocker 10, the carriage 17 further moves to the right in FIG. 3 and is brought to the stock position D. Stocker 10
Is movable vertically to the paper surface direction of FIG. 3, and after moving to a position corresponding to the selected desired disc, the carriage on which the desired disc is placed is pulled out from the stocker 10 by the carriage moving mechanism, and the reproduction position C Move up to.

In this embodiment, since the disc 27 at the reproducing position C and the discs 21 to 26 accommodated in the stocker 10 overlap each other, the optical mechanism 2 is located at a non-overlapping position. Must be placed. Therefore, the pickup 34 is arranged so as to move in parallel with the moving direction of the tray 18 in the direction opposite to the overlapping part with the turntable 33 as the center.

However, when the pickup 34 moves to the outermost position of the disk 27, the pickup 3
A part of 4 is located outside the area occupied by the disk 27. Therefore, it is necessary to increase the distance from the end of the disc 27 at the reproduction position C to the front end of the tray 18,
It has a drawback that the amount of protrusion when the tray 18 is ejected becomes large.

On the other hand, in this embodiment, the tray 1
The position where the carriage 17 is further moved in the load direction of the tray 18 from the load position of 8 is the reproduction position. This makes it possible to shorten the length of the front portion of the tray 18.

FIG. 1 is a sectional view taken along line I--I in FIG.
The state in which the disc 27 is brought to the reproduction position C is shown in FIG.
Shows a state in which the optical mechanism 2 is lifted from the state shown in FIG. 1 to clamp the disc 27.

The optical mechanism 2 including a turntable 33, a pickup 34, etc. is mounted on the mechanical chassis 20, and the mechanical chassis 20 is rotatable about a rotation point P by a drive mechanism (not shown). The pickup 34 is movable from the innermost disc position shown by the solid line to the outermost disc position shown by the dotted line. The turntable 33 has a cone portion 41 to be inserted into the center hole 28 of the disk 27 and an annular mounting surface 42 made of a magnetic material for supporting the recording surface side of the disk 27. The turntable 33 has one end of a rotary shaft 44 of a spindle motor 43. It is press-fitted.

When the disk 27 is eccentrically placed on the turntable 33, the center of the disk 27 and the rotating shaft 44
Since they do not match, the rotating shaft 44 that is rotating receives a pestle-like force. Generally, the rotating shaft 44 is formed thin to reduce the cost, and as a result, the rotating shaft is easily bent by this force. As a result, the disc 27 cannot rotate in the same plane, and in the worst case, the disc cannot be reproduced. Will end up. This problem is particularly noticeable in a CD-ROM drive or the like when the disc is rotated at a high rotation speed such as double speed or quadruple speed.

Further, since the rotating shaft 44 is relatively long, it may not be perfectly aligned due to manufacturing variations. In this case as well, the rotary shaft 44 rotates like a pestle, which adversely affects the reproduction of the disc.

In order to solve this problem, a cylindrical metal shaft 45 made of a material having a hardness higher than that of the rotary shaft 44 is press-fitted into a portion of the rotary shaft 44 located between the turntable 33 and the spindle motor 43. To do. This allows
The strength of the rotary shaft 44 is reinforced, and even when the disc 27 is eccentrically placed on the turntable 33, the pestle-like rotation is prevented. Further, even if the rotation shaft 44 is not aligned due to manufacturing variations, the rotation shaft 44 is forcibly corrected into a straight line by press fitting.

A clamper 50 is supported on the upper chassis 40. A flange 51 is provided on the upper end of the clamper 50 so that the clamper 50 does not fall out from the hole 46 formed in the upper chassis 40. A magnet 52 is provided on the surface of the flange 51 that faces the upper chassis 40. In the unclamped state shown in FIG. 1, the magnet 52 is attracted to the magnetic plate 55 provided on the upper chassis 40 so that the clamper 50 is moved upward. It is fixed to the chassis 40 without rattling. The distance between the lower surface of the clamper 50 and the upper surface of the disk 27 when not clamped is 0.5, which is smaller than the thickness of the disk 11 of 1.2 mm in this embodiment.
It is set to 5 mm and is arranged very close to the disk 27.

Further, a protrusion 53 is formed at the center of the lower end of the clamper 50, and the protrusion 53 is inserted into the recess 35 formed in the center of the turntable 33 at the time of clamping shown in FIG. Match the central axes of.

In order to clamp the disk 27 between the turntable 33 and the clamper 50, the clamper 50 is provided with a magnet 54, and is attracted to the mounting surface 42 of the turntable 33 in the clamped state shown in FIG. A force is generated to hold the disk 27 between the turntable 33 and the clamper 50.

The disk reproducing operation in the above configuration will be described. After the tray 18 is moved from the eject position A to the load position B, the carriage 17 is pulled out from the tray 18 at the load position, so that the disc 2
7 is moved to the reproduction position C. At this reproducing position, the disc 27 is held in the mounting recess 31 formed in the carriage 17, but the disc 27 is vibrated by vibration.
May try to jump out from the mounting recess 31. However, since the clamper 50 is arranged close to the disk 27 with a distance shorter than the depth of the mounting recess 31, the surface of the disk 27 that is about to jump out is the clamper 5.
It collides with the lower surface of 0.

Here, the unclamped clamper 50 has a magnetic plate 55 provided on the upper chassis 40 by a magnet 52.
Even if the disk 27 collides with the clamper 50 due to vibration, the clamper 50 holds its position and the disk 27 pops out of the mounting recess 31. Prevent.

From the unclamped state shown in FIG. 1, the mechanical chassis 20 is rotated by the required drive mechanism (not shown) to the rotation point P.
Is rotated counterclockwise around the center of FIG.
By this rotation, the turntable 33 comes into contact with the disc 27 via the notch 30 formed in the carriage 11, and the cone portion 41 of the turntable 33 is brought into contact with the disc 27.
Is inserted into the central hole 28 of the. Also, turntable 33
The protrusions 53 of the clamper 50 are inserted into the recesses 35, and the clamper 50 and the turntable 33 are centered. Further, the mounting surface 42 of the turntable 33 abuts the recording surface side of the disk 27 so that the disk 27 is moved to the carriage 1
Increase from 7.

When the disk 27 rises 0.55 mm from the mounting recess 31 of the carriage 17, the surface of the disk 27 opposite to the recording surface contacts the lower surface of the clamper 50. At this time, the magnet 54 of the clamper 50 sandwiches the disk 27 and attracts the disk 27 to the mounting surface 42 of the turntable 33.
Clamp. When the turntable 33 further rises, the magnet 52 is pulled away from the magnetic plate 55 and brings the disk 27 to the clamp position shown in FIG. In this state,
The spindle motor 43 rotates to rotate the disk 27 at a required number of rotations, and at the same time, the pickup 34 emits a laser beam to reproduce the information recorded on the disk 27. In this clamped state, the clamper 50 can freely rotate in the hole 46 formed in the upper chassis 40.

Further, since the metal shaft 45 is press-fitted into the rotating shaft 44, the rotating shaft 44 does not bend due to the eccentricity of the disk 27 and the manufacturing error of the rotating shaft 44 of the spindle motor 43, so that the disk 27 can be stabilized. It can be rotated.

Although the present invention has been described as applied to the changer type disc reproducing apparatus, the present invention is not limited to this and may be applied to a disc reproducing apparatus for reproducing one disc. Of course.

Further, in the above-mentioned embodiment, the metal shaft 45 as the reinforcing member is press-fitted into the rotary shaft 44 of the spindle motor 43, but the material of the metal shaft 45 can be appropriately selected. Further, the material is not limited to metal as long as it has the strength to reinforce the rotating shaft 44, and it may be formed of other material. Further, the present invention can take various aspects such as the turntable 33 and the metal shaft 45 can be integrally molded.

[0032]

As described above, according to the present invention, the strength of the rotary shaft of the spindle motor is reinforced, and the strength is corrected into a straight line, so that the disk can be rotated in one plane, and a stable disk is obtained. Is the one that can achieve the reproduction of.

[Brief description of drawings]

FIG. 1 is a sectional view taken along line I-I of FIG. 3 in an unclamped state.

FIG. 2 is a sectional view taken along the line II of FIG. 3 in a clamped state.

FIG. 3 is a top view of the disc reproducing device.

FIG. 4 is a right side view of the disc reproducing device.

[Explanation of symbols]

 1 Disc Playback Device 2 Optical Mechanism 20 Mechanical Chassis 27 Disc 33 Turntable 34 Pickup 43 Spindle Motor 44 Rotation Shaft 45 Metal Shaft

Claims (2)

[Claims] 1. A turntable on which a disc is mounted,
The turntable is fixed to one end of the rotary shaft, the spindle motor rotating the turntable, and the rotary shaft located between the turntable and the spindle motor are fixed to each other. A disk rotation drive device, comprising: a reinforcing member that reinforces the rotating shaft so as to form a straight line. 2. The disk rotation drive device according to claim 1, wherein the reinforcing member is a cylindrical metal shaft that is press-fitted into the rotation shaft.