JP3416678B2 - Disc playback device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk reproducing apparatus having a loading mechanism for transferring a disk. The present invention also relates to a disc reproducing apparatus capable of accommodating a plurality of discs.

[0002]

2. Description of the Related Art Conventionally, as a transfer mechanism for transferring a disc between an eject position and a reproducing position, a transfer mechanism provided with a pair of endless drive belts has been used.
No. 61-24851 and the like.

Further, Japanese Patent Application Laid-Open No. 62-47893 discloses that an endless drive belt conveys the disc between a stocker for accommodating a plurality of discs and a reproducing position.

[0004]

The drive belt in these disc transfer mechanisms moves the disc in its plane, and a rotary drive device for reproducing the disc is separately provided. Therefore, both a belt drive motor and a disk rotation motor are required, which is disadvantageous in terms of cost.

Since the loading and the rotation of the disk are not performed simultaneously, it is possible to use the motor as a unit and mechanically switch the driving force from the motor. It is a cost disadvantage.

[0006]

As a means for solving the above-mentioned problems, the present invention is an endless cable which is stretched substantially parallel to each other between a loading / unloading position and a reproducing position of a disc and wound around the periphery of the disc. A pair of drive belts, a pair of motors that drive the pair of drive belts, respectively, and a pair of motors are controlled so as to drive the disc winding portions of the pair of drive belts in mutually opposite directions when the disc is reproduced,
The motor control means controls the motor so as to drive the disk winding portions of the pair of drive belts in the same direction at the time of transferring the disk between the loading / unloading position and the reproducing position.

According to the present invention, a pair of endless drive belts, which are stretched substantially parallel to each other between a storage position for coaxially storing a plurality of discs and a reproduction position, and are wound around the periphery of the discs, Control the pair of motors to drive the drive belts and the pair of motors to drive the disc winding portions of the pair of drive belts in opposite directions when the disc is reproduced. And a motor control means for controlling the motor so as to drive the disk winding portions of the pair of drive belts in the same direction during transfer.

[0008]

By the pair of drive belts, the disc is rotated at a required rotation speed during the reproduction of the disc, and when the disc is transferred between the loading / unloading position and the reproducing position.
Move the disk in that plane.

Further, the pair of drive belts rotates the disc at a required rotation speed during reproduction of the disc, and moves the disc within its plane during transfer between the storage position and the reproduction position of the disc. To do.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment applied to a changer type disc reproducing apparatus capable of accommodating three discs.

FIG. 1 is a plan view of a disc reproducing apparatus 1 capable of accommodating three discs with three discs accommodated therein, and FIG. 2 is a front view thereof. Outer diameter is 8
The stocker 10 that accommodates a total of three disks 3, 4 and 5 each of which is a cm disk 3 and a 12 cm disk 4, 5 is coaxial with the chassis 2 by a stocker moving mechanism 8 including a motor. It is arranged so that it can move vertically, which is the direction perpendicular to the plane of the paper. In addition, the stocker 10 includes disc mounting plates 11 and 1 on which the discs 3, 4, and 5 are mounted, respectively.
2 and 13, the upper surfaces of the respective mounting plates 11, 12, and 13 support the recording surfaces of the disks 3, 4, and 5. The mounting plates 11, 12 and 13 are the vertical walls 1 at the rear end of the stocker 10.
It is attached to 9.

The disk selected by the stocker moving mechanism 8 can be moved in parallel in the disk reproducing apparatus 1 by a pair of endless drive belts 31 and 32 made of rubber, as shown in FIG. Further, the drive belts 31 and 32 rotationally drive the disk brought to the reproduction position. The drive belt 31 on the left side includes a drive pulley 33 and a driven pulley 34, and the drive belt 32 on the right side.
Are respectively wound around a drive pulley 35 and a driven pulley 36.

The line connecting the rotary shafts 37 and 38 of the drive pulley 33 and the driven pulley 34, and the rotary shafts 39 and 40 of the drive pulley 35 and the driven pulley 36, respectively.
It is always parallel to the line that connects and. Therefore, the stretching directions of the drive belts 31 and 32 are also parallel.

FIG. 3 is a sectional view of the drive pulley 33 taken along the line AA in FIG. The drive pulley 33 has a V-shaped groove 66 formed on the periphery thereof, and the drive belt 31 is wound around the groove 66. The drive belt 31 has a V-shaped cross section, and forms a V-shaped groove 67 on the outer circumference of the closed loop when the drive belt 31 is hung between the drive pulley 33 and the driven pulley 34. Further, on the inner circumference of the closed loop, the drive belt 33 forms a protrusion 68 having a triangular cross section, and the protrusion 68 engages with the groove 66 of each drive pulley 33. The drive pulley 35,
The driven pulleys 34 and 36 have the same shape as the drive pulley 33, and the drive belt 32 has the same shape as the drive belt 31.

The drive pulleys 33, 35 and the driven pulleys 34, 36 are respectively movable with respect to the chassis 2 so that the drive belts 31, 32 can move in the direction of approaching each other. The stocker 10, drive belts 31 and 3 in the disc reproducing apparatus 1 shown in FIG.
A description will be given with reference to FIG. 4, which is a plan view with 2 and the like removed.

Drive pulleys 33, 35 and driven pulley 3
The rotary shafts 37, 39, 38, 40 of 4, 36 are rotatably supported in cylindrical bearings 41, 43, 42, 44, and these bearings 41, 42 are slides arranged on the other side of the chassis 2. The bearings 43, 44 are fixedly arranged at both ends of the plate 47, and at both ends of a slide plate 48 arranged on the other side of the chassis 2.

A pair of rotating arms 45, 46 arranged on one side of the chassis 2 are pivotally supported at their intermediate positions by shafts 50 provided on the chassis 2. Long holes 51 and 52 are formed at both ends of the rotating arm 45, and a bearing 41 is inserted into the long hole 51 and a bearing 44 is inserted into the long hole 52. Similarly, elongated holes 53 and 54 are respectively formed at both ends of the rotating arm 46, and the bearing 42 and the elongated hole 5 are formed in the elongated hole 53.
Bearings 43 are inserted into the respective bearings 4.

Slots 55 to 58 are formed in the chassis 2,
Bearings 41 to 44 are inserted into the elongated holes, respectively. Therefore, the slide plates 47 and 48 are movable in parallel with each other, so that the line connecting the rotation shafts 37 and 38 of the drive pulley 33 and the driven pulley 34 and the drive pulley 3 are connected.
5. The lines connecting the respective rotary shafts 39 and 40 of the driven pulley 36 can be moved in the directions of approaching or separating from each other while keeping the lines parallel to each other.

A drive belt moving mechanism 60 including a motor is connected to one slide plate 48. With the movement of the slide plate 48 by the drive belt moving mechanism 60, the slide plate 47 connected to the slide plate 48 by the rotating arms 45 and 46 also moves by the same amount as the movement amount of the slide plate 48. Therefore, the drive belts 31 and 32 move in the directions toward and away from each other by the same amount. Motors 61 and 62 are attached to the slide plates 47 and 48, respectively, and their rotation shafts penetrate the bearings 41 and 43 and are connected to the rotation shafts 37 and 39 of the drive pulleys 33 and 35, respectively.

As shown in FIG. 1, an optical pickup 6 having an objective lens 7 is fixedly arranged on the chassis 2 so that the information recorded on the disc can be optically reproduced. Tracks (not shown) on which information is recorded are spirally formed on the disks 3, 4, and 5, and during reproduction, light emitted from the optical pickup 6 is emitted to these tracks by a well-known tracking servo. By following the optical pickup 6, the optical pickup 6 relatively moves from the inner circumference to the outer circumference of the disks 3, 4, and 5 as the disk is reproduced.

In this embodiment, the optical pickup 6
Are fixedly arranged with respect to the chassis 1, and the disc being reproduced moves in the radial direction with respect to the optical pickup 6. Therefore, there is no play in the mechanism of the moving mechanism that moves the optical pickup 6, and extremely stable reproduction of the disc becomes possible. Of course, a disc moving mechanism for moving the disc is required, but in the case of the present embodiment, the pair of belts 3 for moving the disc in the apparatus 1 is used.
Since it is shared by 1 and 32, it is advantageous in terms of cost.

Reference numeral 9 denotes a front panel, in which a slit-shaped opening (not shown) is formed so that one disk can be attached to and detached from the apparatus 1.

A disc position regulating means 20 is provided to regulate the positions of the discs 3, 4, 5 in the stocker 10. 5 is a front view of a main portion of the stocker 10 and FIG. 6 is a cross-sectional view of the disk position regulating means 20.
Will be explained.

The disk position regulating means 20 is a hollow upper shaft 21 fixedly arranged on the chassis 2, and a shaft moving mechanism 25 comprising a motor or the like in the upper shaft 21.
It comprises a drive shaft 22 and an upper shaft 21 which are moved by means of a hollow lower shaft 23 which is coaxially fixed to the chassis 2. Between the upper shaft 21 and the lower shaft 23, there is a gap 24 through which a disc can pass.
Are formed.

The disc position restricting means 20 is provided with a restricting shaft 27 which is movable in the upper shaft 21 and is biased by a spring 30 in a direction away from the drive shaft 22. A large-diameter portion 28 formed at the tip of the drive shaft 22 is inserted into the internal space 29 of the regulation shaft 27. In the illustrated state, the drive shaft 22 is moved to the lowered position by the shaft moving mechanism 25 so that the tip end of the regulation shaft 27 is moved to the lower shaft 23.
Is inserted in the hollow portion of the above, and the gap 24 is closed. In addition, when the drive shaft 22 is moved to the raised position by the shaft moving mechanism 25, the restriction shaft 27 moves toward the upper shaft 2.
1 and brought to the position shown in FIG. 7 to open the gap 24.

Upper shaft 21 and lower shaft 23
Is 8 cm which penetrates the center hole of the disk.
Although the discs 3 and the 12 cm discs 4 and 5 have different outer diameters, their center holes 63, 64 and 65 have the same inner diameter. Therefore, the upper shaft 21 or the lower shaft 2
The position of the disc in which any one of 3 is inserted in the center hole is restricted in the stocker 10. In FIGS. 5 and 6, since the movable shaft 22 is exposed in the gap 24, the movement of the disks 3 and 4 is restricted by the upper shaft 21, and the movement of the disk 5 is restricted by the movable shaft 22.

FIG. 8 is a circuit block diagram for controlling the driving of the motors 61 and 62. The microcomputer 70 performs a focus servo for moving the objective lens 7 of the optical pickup 6 in a direction to approach / separate from the recording surface of the disc, and a tracking servo for moving the objective lens 7 in a direction orthogonal to the track of the disc. In order to perform the above, the focus servo signal and the tracking servo signal are output from the output terminals 71 and 72, respectively.

These servo signals move the objective lens 7 in a required direction via the drive circuits 80 and 81, respectively. In addition, a low pass filter (hereinafter, L
(Referred to as PF) 82 is connected to take out the DC component of the tracking servo signal. This DC component is input to the adding circuits 83 and 84.

From the output terminal 73 of the microcomputer 70, a disk transfer signal for transferring the disk in the apparatus 1 is output. That is, a predetermined voltage of positive polarity is output when the disc is moved from the eject position to the stocker 10 direction, and a predetermined voltage of negative polarity is output when the disc is transferred from the stocker 10 to the eject direction. This disk transfer signal is input to the first and second adder circuits 83 and 84, respectively. The output of the adder circuit 83 is input to the third adder circuit 85, and the output of the adder circuit 84 is input to the fourth adder circuit 86 via the polarity inversion circuit 89.

From the output terminal 74 of the microcomputer 70, CL
A CLV servo signal for rotating the disk on which information is recorded by V is output. As is well known, this servo signal rotates the disk at a predetermined speed based on a phase difference signal obtained by comparing the phase of the synchronizing signal included in the reproduction signal from the optical pickup 6 with the reference clock. This CLV servo signal is added to the adder circuit 85,
It is input to 86. The outputs of the adder circuits 85 and 86 drive the motors 61 and 62 to rotate through the motor drive circuits 87 and 88.

When the disk is transferred in the device 1, a voltage having a required polarity is generated from the output terminal 73 of the microcomputer 70 according to the transfer direction, and the motors 61 and 62 are controlled to transfer the disk. During reproduction of the disc, the motors 61 and 62 are controlled by both the CLV servo signal from the output terminal 74 of the microcomputer 70 and the DC component of the tracking servo signal output from the output terminal 72 to rotate the disc.

The output terminal 75 of the microcomputer is connected to the stocker moving mechanism 8 described above, the output terminal 76 is connected to the shaft moving mechanism 25, and the output terminal 77 is connected to the drive belt moving mechanism 60 to control the respective operations.

The operation of the above configuration will be described. From the disk storage state shown in FIG.
When reproducing the 12 cm disc 5 stored at the bottom among the discs stored therein, the microcomputer 70 outputs a control signal for driving the drive belt moving mechanism 60 to its output terminal 77, The drive belt moving mechanism 60 shown in FIG. 4 connects the slide plate 48 to the long holes 57, 58.
Along the direction parallel to the left direction in FIG.

Along with this movement, the slide plate 47 connected to the slide plate 48 by the rotating arms 45 and 46 is also moved rightward in FIG. 4 along the elongated holes 55 and 56, so that the slide plates 47, 48 move parallel to each other. Along with this movement, the drive belts 31 and 32 also move in the directions in which they approach each other, and as shown in FIG. 9, the drive belts 31 and 32 are respectively wound around the outer periphery of the disk 5 at a required angle.

In this state, the microcomputer 7 shown in FIG.
0 outputs a control signal for controlling the shaft moving mechanism 25 from its output terminal 76 before starting the transfer of the disc 5 to the reproducing position, and follows the pulling up of the drive shaft 22 by the shaft moving mechanism 25, and the restriction shaft 27. Is pulled up into the upper shaft 21 to open the gap 24 between the upper shaft 21 and the lower shaft 23, as shown in FIG.

Subsequently, the microcomputer 70 shown in FIG. 8 outputs a disk transfer signal having a predetermined negative voltage to its output terminal 73, whereby the motor 61 rotates clockwise and the motor 62 rotates counterclockwise. , Drive belt 3
By driving the parts of the disks 1 and 32 wound around the disk 5 in the same direction, the disk 5 is pulled out from the stocker 10 and brought to the reproduction start position shown in FIG. At this position, the objective lens 7 of the optical pickup 6 is located at the innermost position indicated by the alternate long and short dash line in the recording range of the disc 5.

After bringing the disk 5 to the position shown in FIG. 10, the microcomputer 70 outputs a positive polarity CLV servo signal from the output terminal 74 of the microcomputer 70.
The parts 1 and 62 are rotated counterclockwise, and the portions of the drive belts 31 and 32 wound around the disk 5 are driven in opposite directions to rotate the disk 5 clockwise at a required rotation speed.

The laser beam emitted from the objective lens 7 is focused on the recording surface of the disk 5 and is tracked to the track of the disk 5, so that the objective lens 7 follows the surface wobbling of the disk 5 by the focus servo. Is moved up and down, and the eccentricity of the disk 5 is followed by the tracking servo to move the objective lens 7 in the direction orthogonal to the track of the disk 5.

Where v is the read linear velocity of the disk,
If p is the track pitch, ri is the innermost radius in the recording range of the disk 5, rt is the read radius t seconds after ri, and rd is the radius of the disk 5, the read radius after t seconds is v.p. t = π (rt ² −ri ² ) Therefore, ∴

[Equation 1] Velocity of each drive belt 31, 32 after t seconds v ₁₁ t, v ₂₁ t
Is

[Equation 2]

[Equation 3] The motors 61 and 62 are controlled so that this speed is achieved during playback of the disc 5.

Since the track is formed in a spiral shape on the disk 5, the objective lens 7 gradually moves toward the outside of the disk 5 as a result of reproduction, and as a result, a positive DC component appears in the tracking servo signal. .

This DC component is taken out by the LPF 82 shown in FIG. 8, and the adder circuits 83 and 85 and the drive circuit 87 are obtained.
Via the adder circuit 84, the polarity reversing circuit 89, the adder circuit 86, and the drive circuit 88 to the motor 61.
2 is applied. Therefore, since the voltages applied to the motors 61 and 62 are the same in the state of being rotated only by the CLV servo signal, the motor 61 should increase its rotational speed and the motor 62 should decrease its rotational speed. The voltage applied to each motor 61, 62 changes.

Therefore, as a result of the speed of the drive belt 31 increasing with respect to the speed of the drive belt 32, a moving force in the direction in which the center of rotation of the disk 5 separates from the objective lens 7 is generated, so that the disk 5 is stored in the stocker 10. The objective lens 7 of the optical pickup 6 follows the spiral track recorded on the disk 5 by moving in the direction.

During the reproduction, the drive belts 31 and 32 are wound around the periphery of the disc 5, so that the vibration of the disc 5 generated during the rotation of the disc 5 is suppressed. Further, the cross sections of the drive belts 31 and 32 are V-shaped as shown in FIG. 3, so that the peripheral edge of the disk 5 is clamped, and it is possible to prevent surface wobbling of the disk 5.

The drive belt 3 along with the reproduction of the disk 5
FIG. 11 is a plan view showing a state in which the disk 5 is moved with respect to the objective lens 7 by 1, 32 and the optical pickup 6 is reproducing the outermost peripheral position shown by the chain double-dashed line in the recording range of the disk 5. At this position, the reproduction of the disc 5 ends. Next, the operation of the shaft moving mechanism 25 when the disk 5 is stored in the stocker 10 will be described in time series with reference to FIG.

At the reproduction end position shown in FIG. 11, since the restriction shaft 27 has moved into the upper shaft 21, the gap 24 between the upper shaft 21 and the lower shaft 23 as shown in FIG. Open this gap 2
A disk 5 is located in the disk 4. When the disc 5 is stored in the stocker 10 after the reproduction of the disc 5, the microcomputer 70 first outputs a control signal to its output terminal 76 so that the restriction shaft 27 is inserted into the lower shaft 23. The drive shaft 22 is moved to the lowered position.

However, since the disc 5 is located in the gap 24, the tip end of the regulating shaft 27 is brought into contact with the surface of the disc 5 as shown in FIG. 12B. Note that FIG. 13 shows a cross-sectional view of the disc position regulating means 20 in this state. In this state, the microcomputer 70 outputs a positive polarity disk transfer signal to the output terminal 73 thereof, so that the disk 5 starts moving in the arrow direction toward the stocker 10 by the drive belts 31 and 32.

Along with this movement, the tip of the regulating shaft 27 slides on the surface of the disk 5, and the center hole 65 of the disk 5 is moved.
When the control shaft 2 is aligned with the control shaft 27, the control shaft 2
7 is inserted into the lower shaft 23 through the center hole 65 of the disk 5 by the urging force of the spring 30. This state is shown in FIG. 12 (c) and FIG. The restriction shaft 27
The drive of the motors 61 and 62 is stopped by detecting that the motor has moved into the lower shaft 23 by a required detection means.

The regulating shaft 27 is attached to the center hole 6 of the disk 5.
5, the disc 5 is inserted into the stocker 10
Positioning is performed inside, and the disk 5 is prevented from jumping out of the stocker 10 due to vibration or the like. Further, the disks 3 and 4 other than the disk 5 moved by the drive belts 31 and 32 are similarly positioned in the stocker 10 by the upper shaft 21, and are prevented from jumping out of the stocker 10.

When the 8 cm disc 3 stored in the uppermost stage of the stocker 10 is reproduced after the disc 5 is stored in the stocker 10, the microcomputer 70 outputs its output terminal 7
5 outputs a stocker drive signal, and the stocker moving mechanism 8 moves the stocker 10 downward until the disk 3 and the drive belts 31 and 32 are flush with each other. Subsequently, the microcomputer 70 connects the output terminal 77 to the drive belt moving mechanism 6
By outputting a control signal for driving 0, the drive belts 31 and 32 are wound around the outer circumference of the disk 3 as shown in FIG.

From this state, the microcomputer 70 outputs a control signal for controlling the shaft moving mechanism 25 from its output terminal 76 before starting the transfer of the disk 3 in the apparatus 1.
The shaft moving mechanism 25 raises the restriction shaft 27 into the upper shaft 21 to open the gap 24 between the upper shaft 21 and the lower shaft 23.

Subsequently, the microcomputer 70 outputs a disk transfer signal having a predetermined negative voltage to the output terminal 73 thereof, whereby the motor 61 rotates in the clockwise direction and the motor 62 rotates in the counterclockwise direction, and the drive belts 31 and 32. The disk 3 is pulled out from the stocker 10 by means of, and the disk 3 is brought to the reproduction start position shown in FIG. 15, and the drive belts 31 and 32 rotate the disk 3 in the clockwise direction at the required rotation speed as described above.

Further, when ejecting the disc 5 which has been reproduced as shown in FIG. 11, a negative disc transfer signal is outputted to the output terminal 73 of the microcomputer 70 so that the motor 61 is rotated clockwise and the motor 62 is turned off. By rotating the disk 5 clockwise, a part of the disk 5 is exposed through an opening formed in the front panel 9 as shown in FIG.

At the reproduction end position shown in FIG. 11, the distance between the inner sides of the drive pulleys 33 and 35 and the driven pulleys 34 and 36 is set so that the drive belts 31 and 32 are wound around the outer periphery of the disc 5. It is smaller than the diameter. Therefore, at the eject position shown in FIG. 16, the distance between the driven pulleys 34 and 36 is increased as the disc 5 moves in the eject direction compared to FIG. 11, and the disc 5 passes between the driven pulleys 34 and 36. It is possible to eject.

When it is detected from the front panel 9 that the disc 5, a part of which is exposed, is ejected by the user, the microcomputer 70 outputs a drive belt movement control signal to the output terminal 77, and the microcomputer 70 outputs 8 cm or 12 cm.
The drive belts 31 and 32 are moved by the drive belt moving mechanism 60 to the loading standby position shown in FIG. In this position, the distance between the inner sides of the driven pulleys 34, 36 is less than the diameter of the 8 cm disc.

At this position, when either a disk of 8 cm or a disk of 12 cm is inserted through the opening of the front panel 9, both driven pulleys 34 and 36 receive a force to increase the distance. Therefore, the rotating arms 45, 4
Similarly, the slide plates 47 and 48 connected by 6 also move in directions away from each other. By detecting this movement, the microcomputer 70 outputs a positive polarity disk transfer signal to the output terminal 73 thereof to drive the drive belts 31 and 32 and load the inserted disk into the apparatus 1.

When the loaded disc is stored in the stocker 10 without being played back, when the center of the loaded disc is located up to the playback end position shown in FIG. When the drive shaft 22 of the regulating means 20 is moved by the shaft moving mechanism 25 so that the tip of the regulating shaft 27 abuts the surface of the disc and the disc is stored in the stocker 10, the regulating shaft 27 is inserted in the center hole of the disc.
The disc is positioned by inserting the.

The tip of the regulation shaft 27 slides on the surface of the disc, so that the disc is not scratched.
Although it is desirable that the regulation shaft 27 is formed of polyacetal resin or the like having good sliding property, a member having a small sliding friction can be attached to the tip of the regulation shaft 27.

In the above-described embodiment, the drive belt is irradiated by the movement of the disc in the device for loading / ejecting and storage in the stocker, the rotation of the disc in the reproducing position, and the optical pickup. In order to move the laser light to move over the recording area of the disc, the optical pickup and the disc are moved relatively to each other, so that three operations of movement within the rotation plane of the disc being reproduced are performed. However, the present invention is not limited to this, for example, by making the optical pickup movable with respect to the chassis, the drive belt moves the disk in the device for loading / ejecting or storing in the stocker. Then, two operations of rotating the disc at the reproduction position may be performed.

[0059]

According to the present invention, the disc is moved between the reproduction position and the loading / unloading position, or between the reproduction position and the storage position by the drive belt, and the drive belt rotates the disc at the reproduction position as required. Since it can be rotationally driven at a speed, a low-cost disk reproducing device can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view of a disc reproducing device.

FIG. 2 is a front view of a disc reproducing device.

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

4 is a plan view of the disc reproducing apparatus 1 shown in FIG. 1 with the stocker 10, drive belts 31, 32, etc. removed.

FIG. 5 is a front view of an essential part showing a disc position regulating means.

6 is a sectional view of FIG.

FIG. 7 is a cross-sectional view showing a disc position restricting means in a state where a gap is opened.

FIG. 8 is a circuit block diagram that controls the drive of a motor that drives a drive belt.

FIG. 9 is a plan view of the drive belt wound around the disc.

FIG. 10 is a plan view showing a state where the disc is brought to the reproduction start position.

FIG. 11 is a plan view showing a state in which the disc is brought to the reproduction end position.

FIG. 12 is a view for explaining the operation of the disc position regulating means in time series.

FIG. 13 is a sectional view of an essential part for explaining the disc position regulating means in a state where the regulating shaft is in contact with the disc.

FIG. 14 is a plan view showing a state in which a drive belt is wound around an 8 cm disc.

FIG. 15 is a plan view showing a state where an 8 cm disc is brought to a reproduction start position.

FIG. 16 is a plan view showing a state where the disc is brought to the eject position.

FIG. 17 is a plan view in a loading standby state.

[Explanation of symbols]

1 Disc player 2 chassis 38 cm disc 4 12cm disc 5 12cm disc 6 Optical pickup 8 Stocker moving mechanism 10 Stocker 20 Disc position control means 21 Upper shaft 22 Drive shaft 23 Lower shaft 25 Shaft moving mechanism 27 Regulated shaft 31 drive belt 32 drive belt 60 Drive belt moving mechanism 61 motor 62 motor 70 Microcomputer

Front page continuation (72) Inventor Jinro Nakamichi 1-153 Suzuki-cho, Kodaira-shi, Tokyo Nakamichi Co., Ltd. (56) Reference JP 62-47893 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G11B 17 / 04,17 / 22-17/30

Claims (2)

(57) [Claims] 1. A pair of endless drive belts, which are stretched substantially parallel to each other between a loading / unloading position and a reproducing position of a disc and wound around the periphery of the disc, and drive the pair of drive belts, respectively. And a pair of motors to control the pair of motors to drive the disc winding portions of the pair of drive belts in mutually opposite directions in order to rotate the disc at a required rotation speed during reproduction of the disc, Further, when the disc is transferred between the loading / unloading position and the reproducing position, the disc winding portions of the pair of drive belts are driven in the same direction so as to move the disc in the plane thereof. A disc reproducing apparatus comprising: a motor control unit that controls a motor. 2. A pair of endless drive belts stretched substantially parallel to each other between a storage position for coaxially storing a plurality of discs and a reproduction position, and wound around the periphery of the discs. A pair of motors for respectively driving the drive belts, and a pair of the pair of drive belts for driving the disk winding portions in opposite directions in order to rotate the disk at a required rotation speed during reproduction of the disk. And controlling the motor of the pair of drive belts so that the disc winding portions of the pair of drive belts move in the same direction in order to move the disc in its plane during transfer between the storage position and the reproduction position. And a motor control means for controlling the motor so as to drive the disc reproducing apparatus.