JP3198374B2 - 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 disc reproducing apparatus such as a compact disc player.

[0002]

2. Description of the Related Art Conventionally, as a reproducing apparatus for a compact disk, there is a so-called CD reproducing apparatus with a rotary changer. As shown in FIG. 22, the CD player 50 with a rotary changer includes a turntable 51 on which a plurality of discs are placed.
One (1) from multiple (or one) discs
One disc is selectively picked up and played. In such a CD reproducing apparatus 50, the following configuration is required to reproduce the next compact disc or any compact disc.

That is, in the CD reproducing apparatus 50,
A gear 52 is provided on the back surface of the turntable 51, a pulley gear 53 is meshed with the gear 52 to drive the turntable 51, and a driving force of a first motor 55 is transmitted via a belt 54. It has become. Further, a disk reproducing section 56 including a pickup is held by a frame 57 which can swing up and down. The frame 57 is engaged with a cam provided on a side surface of the cam gear 58, and the frame 5 is rotated by rotation of the cam gear 58.
7 is configured to move up and down. This cam gear 58
Switch 5 through protrusion on bottom for detecting end position
9 and is engaged with a pulley gear 60 for driving a cam gear. The pulley gear 60 has a structure in which the driving force of the second motor 62 is transmitted to the cam gear 58 via the belt 61, and the disk reproducing unit 56 is moved up and down.

On the back surface of the turntable 51, a disk number detecting member 63 and a turntable stop position detecting member 64 are provided. Further, the respective detection sensors 65 and 66 are connected to the base 6 below the turntable 51.
7 is attached. Further, the turntable 51
A concave portion 68 is provided on the outer periphery of the turntable 51 so as to be stably fixed to a desired position, and a roller 69 urged to press against the concave portion 68 is rotatably provided. The number of the concave portions 68 is equal to the number of disks that can be placed.

[0005] The CD reproducing apparatus 50 constructed as described above.
In order to reproduce a desired compact disk, the second motor 62 is driven by an external signal, the cam gear 58 is rotated clockwise, and the disk reproducing unit 56 is lowered via the frame 57. The cam gear 58 is
When the cam gear 58 makes one rotation, the projection on the bottom surface of the cam gear 58 comes into contact with one side surface of the switch 59 and stops at the same time.
At the same time as receiving the stop signal from the switch 59, a signal is transmitted to the first motor 55, and the drive starts, and the turntable 51 starts rotating clockwise.
The disc number position when the turntable 51 stops is determined by the disc number detecting member 63 and the sensor 65.
Is determined by the number passed. For example, when two are detected, the disc number becomes “2”.

Thereafter, the turntable 51 further continues to rotate, and the first motor 55 stops at the same time when the turntable stop position detecting member 64 passes the sensor 66. At the same time, the cam gear 5 is
A signal is input so that 8 reverses counterclockwise. Next, one revolution of the cam gear 58 causes the disc reproducing unit 56 to rotate.
Rises and stops at the playback position. The cam gear 58 stops when the projection on the bottom surface contacts the switch 59. Since the stop position of the turntable 51 at this time is unstable only by the turntable stop position detecting member 64 and the sensor 66, the roller 69 urged to be pressed against the outer periphery of the turntable 51 is rotated by the turntable 5.
1 is fitted into the concave portion 68 on the outer periphery and can be stopped stably.

The following is a description of the electronic control system of this series of operations.

FIG. 23 is a block diagram showing a conventional control method. FIG. 24 is a schematic plan view showing detection of a disc number and detection of a turntable stop position, and FIG. 25 is a timing chart of each detection signal.

In order to reproduce a compact disc having a desired disc number from a state where the disc is currently stopped at an arbitrary disc number, the control microcomputer 71
First, based on information obtained from the disc number detecting sensor 65, the turntable stop position detecting sensor 66, the ascending position detecting switch 59a and the descending position detecting switch 59b of the disc reproducing unit 56, the ascending and descending motor driving means 73 is used. The second motor 62 is rotated in the forward direction until the lowering position detection switch 59b is turned on. Then, the first motor 55 for rotation of the turntable 51 is rotated by the rotation motor driving means 72 based on the information obtained from the sensor 65 for detecting the disk number and the sensor 66 for detecting the stop position of the turntable. Rotate until it is judged.

Then, the motor drive means 7 for raising and lowering again
By rotating the second motor 62 in the reverse direction by 3 and continuing until the ascending position detection switch 59a is turned on, the reproduction of the compact disk at the desired disk number position becomes possible.

The specific method of determining the disc number position and the turntable stop position is as shown in FIGS. On the back side of the turntable 51, a disk number detecting member (rib) 63 having a number of slits corresponding to the disk number, and a turntable stop position detecting member 6 having a rib corresponding to the turntable stop position.
The photo interrupter is used as a sensor 65 for detecting a disk number and a sensor 66 for detecting a stop position of a turntable so that the optical path is interrupted when the detection members pass by the rotation of the turntable 51. It is provided in.

As the turntable 51 rotates, a signal S65 from the disk number detecting sensor 65 and a signal S66 from the turntable stop position detecting sensor 66 as shown in FIG.
1 is input. Based on this, the control microcomputer 71
When the signal S66 changes from “L” to “H”, it is determined that the turntable 51 is at the non-stop position, and a standby state for the input of the signal S65 from the disk number detection sensor 65 is entered. The disc number is recognized based on the number of input pulses of "H" of the signal S65 accompanying the rotation of 51. Thereafter, the signal S66 changes from “H” to “L”.
Is determined to be the turntable stop position. Further, the control microcomputer 71 performs a braking operation after the disc number is recognized by the rotating motor drive means 72 (a in FIG. 25) in order to accurately stop the turntable 51 at a desired disc number position, and immediately thereafter. The reverse rotation control of the first motor 55 is performed for a short time (FIG. 25B).

[0013]

In the conventional CD reproducing apparatus 50 constructed as described above, when a desired compact disk is to be reproduced, the rotary drive system of the turntable 51 and the lifting / lowering of the disk reproducing section 56 are required. Since the drive systems are separate, the number of parts increases and the structure and control are complicated.
Further, since the stop position of the turntable 51 is not mechanically determined and is stably stopped by the rollers 69 pressed against the outer periphery of the turntable 51, the first motor is driven when the turntable 51 is driven to rotate. There is also a problem that a large load is applied to the belt 55, making it difficult to drive the belt and slipping the belt. Further, since the drive / stop of the turntable 51, the elevation of the disk reproducing unit 56, etc. are all electronically controlled, the circuit system becomes complicated and the control is greatly affected by the load fluctuation of the rotating system.
There is a problem that it is difficult to stabilize the control.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a simplified structure, can rotate a turntable with a smaller driving force, and can further rotate and stop the turntable. The purpose is to make it easier to control the lifting and lowering of the disk playback section, and also to enable the turntable to be inverted with only a small addition of control circuits, resulting in a time loss in playing the farthest disk. It is an object of the present invention to provide a disk reproducing apparatus that does not cause the problem.

In a conventional disk reproducing apparatus with a rotary changer, a disk other than the disk at the reproduction position among the plurality of disks mounted on the turntable can be exchanged. In the mounting state, the disk is almost in close contact with a slightly recessed disk mounting portion, so that it is difficult to remove the disk from the disk mounting portion at the time of disk replacement, and there is a problem that replacement is difficult. Further, discs other than the disc at the playback position are simply placed on the shallow disc mounting portion and are not fixed, so that in the case of a disc reproducing apparatus that is used by moving the place of use. In such a case, the disk becomes unstable on the turntable during the movement, and there is a possibility that the disk may be displaced from the disk mounting portion or the disk may be damaged.

Another object of the present invention is to make it easy to pick up the disk from the disk mounting portion when replacing the disk, and to apply vibration or impact to the disk reproducing device when moving the disk reproducing device. Even when the disk is displaced, it is necessary to surely prevent the disk from being displaced or damaged from a predetermined disk mounting portion of the turntable.

[0017]

According to a first aspect of the present invention, there is provided a disk reproducing apparatus which is rotatably provided with N (N is an integer of 3 or more) disks centered on a rotation center. A turntable that can be placed at approximately equal intervals on the circumference of the
A disc reproducing unit which is provided to be able to move up and down with respect to the turntable and reproduces a disc brought to a position facing the turntable; a cam rotating body having a gear for rotating the turntable; Having a motor to be driven dynamically, rotating the turntable by a predetermined angle to reproduce a desired disk among the N disks,
In the disc reproducing apparatus for reproducing the desired disc by the disc reproducing unit, the turntable includes
Teeth having an appropriate number of teeth to which driving force is applied from the gear
While a wheel is provided, the gear is driven by the gear
A tooth that applies force and a tooth that does not apply driving force to the gear portion.
A tooth portion is provided, and the number of the teeth is determined by the cam rotation.
360 ° / N of turntable by one rotation of body
It is characterized in that it is set to a value for rotation .

(2) The disc reproducing apparatus according to claim 2 of the present invention, in the disc reproducing apparatus according to claim 1, wherein a cam for rotating the disc reproducing unit and a cam for detecting one rotation are provided on the cam rotating body. And a detection switch corresponding to the one-turn detection cam is provided.

(3) The disc reproducing apparatus according to claim 3 of the present invention is arranged such that N (N is an integer of 3 or more) rotatably provided substantially on a circumference centered on the center of rotation. a turntable that can be placed at regular intervals, and a disk playback section for reproducing Kitasa disk has a vertically movably provided opposite position with respect to the turntable, one revolution
Gear for rotating the turntable by 360 ° / N
A cam rotor, and driving the cam rotor to rotate
And a desired data among the N disks.
Turn the turntable at a predetermined angle to play the disc.
And the desired disc is reproduced by the disc reproducing unit.
In a disc player that plays back discs,
When it is brought to a position facing the
A member that prevents the turntable from rotating is provided by the turntable.
When mounted in a state where it can slide in the radial direction of the cable
In both cases, the rotation preventing member is operated by the cam rotating body.
A cam is provided .

(4) The disk reproducing apparatus according to the fourth aspect of the present invention is arranged such that N (N is an integer of 3 or more) rotatably provided substantially on a circumference around the rotation center. A turntable that can be placed at equal intervals, a disc reproducing unit that is provided on the turntable so as to be able to move up and down and reproduces a disc brought to an opposing position, and a gear for rotating the turntable. A cam rotating body having
A motor for driving the cam rotor to rotate;
The desired disc among the discs is
Turntable when brought to a position opposite to
A member for preventing rotation of the cam rotor;
A cam for operating the rotation preventing member,
The turntable is 360 ° by one rotation of the rotating body
/ N disk playback device set to rotate
The rotation preventing member has a recess in the turntable.
A locking portion to be fitted is provided, and
Fits in the recess at the tip of the turntable rotation direction
A small projection is formed .

(5) A disk reproducing apparatus according to a fifth aspect of the present invention is the disk reproducing apparatus according to any one of the first to fourth aspects, wherein a disk number detecting member is provided on the back surface of the turntable. And a disk number detecting switch for detecting the disk number detecting member.

(6) In the disk reproducing apparatus according to claim 6 of the present invention, in the disk reproducing apparatus according to any one of claims 1 to 5, all cam shapes of the cam rotor are symmetric. This enables the turntable to rotate forward and backward.

(7) In the disc reproducing apparatus according to claim 7 of the present invention, the disc reproducing device is rotatable and a plurality of disc mounting portions are provided at substantially equal intervals on a circumference centered on the center of rotation. A turntable, a disc reproducing unit provided to be capable of ascending and descending with respect to the turntable and reproducing a disc brought to an opposing position, and a gear for rotating the turntable and elevating the disc reproducing unit A cam rotating body having a cam to be driven, and a center hole of a disk on a disk mounting portion other than a position facing the disk reproducing portion in response to the elevation of the disk reproducing portion in a non-rotating state of the turntable. An elevating shaft with a disk receiving portion that moves up and down with respect to the turntable while supporting the disk from below. It is a feature.

(8) A disk reproducing apparatus according to an eighth aspect of the present invention is the disk reproducing apparatus according to the seventh aspect, further comprising a cover for covering an upper part of the turntable, wherein the cover has a center hole formed therein. It is characterized in that a retaining cylinder is provided which is fitted on the outer circumference of the inserted elevating shaft.

(9) The disc reproducing apparatus according to a ninth aspect of the present invention is the disc reproducing apparatus according to the eighth aspect, wherein the elevating shaft is vertically slidably mounted on the elevating shaft main body, and the elevating shaft is connected to the elevating shaft. A spring for biasing upward is provided.

[0026]

[Action]

(1) In the disk reproducing device of the first aspect, one rotation of the cam rotator unconditionally brings the disk closest to the disk at the reproduction position to the reproduction position. That is, for example, from the disc at the playback position (36
In order to reproduce a disc separated by 0 ° / N) × k, the cam rotor needs to be rotated k times.

As in the conventional example, in a disk reproducing apparatus in which the rotation of a motor is transmitted to a pulley gear via a belt or the like to rotate a turntable, (360 ° / N) ×
(1-(N-1)) When trying to play a distant disk, the control of the rotation angle of the turntable had to be very complicated. Control was just fine, and control became extremely simple.

(2) In the disk reproducing apparatus according to the second aspect, when the cam rotating body makes one rotation, the disk reproducing section temporarily goes down and moves up to the normal reproducing position, and the turntable rotates 360 ° / N. , The next disk is brought to the playback position.

That is, for example, when selecting the next three disks, the disk reproducing unit goes up and down three times, but only by rotating the cam rotor three times, the turntable rotates to a desired position and The reproducing section is also reliably located at the normal reproducing position.

In the case of the conventional example, when the turntable is moved to a desired position, for example, when three adjacent disks are selected, the turntable is rotated by a predetermined angle at the desired position. And there is a time loss.

Further, if the completion of the movement of the turntable and the completion of the up of the disk reproducing unit are attempted almost simultaneously, it becomes very difficult to control the synchronization.

According to the second aspect, such a problem is solved, and it is sufficient to rotate the cam rotor only by the number of disks to be moved, so that the control is very simple and the switching time of the disk is reduced. Shorter.

Further, since all means for rotating the turntable, elevating and lowering the disk reproducing unit, and detecting the amount of rotation are integrated in the cam rotating body, these operations are inevitably synchronized with each other. It operates with high accuracy and requires a small number of parts. Further, since the rotation of the turntable and the lifting and lowering of the disk reproducing unit are performed by one cam rotating body, only one motor is required.

(3) In the disk reproducing apparatus of the third aspect, the rotation preventing member is driven by the cam rotating body. Since the cam rotator also drives the turntable and the disk reproducing unit, the rotation preventing member is driven in synchronization with these movements, thereby improving accuracy and reliability. Further, when viewed from a different viewpoint, since these are operated by one cam rotating body, the number of parts is reduced. Furthermore, the rotation preventing member slides on the turntable only when the rotation preventing member is fitted to the turntable to perform the rotation preventing function, and otherwise does not slide, so that even if the diameter of the turntable is large, regardless of,
The load applied to the turntable is small (the urging roller of the conventional example is always in sliding contact with the turntable).

(4) In the disk reproducing apparatus of the fourth aspect, when the locking portion of the rotation preventing member slides on the small projection when sliding on the outer peripheral surface of the turntable, the contact area is small and the frictional resistance is small. . Also, when the locking portion approaches the concave portion of the turntable, the small projection of the locking portion first fits into the concave portion, and then the small projection contacts the side wall of the concave portion, so that the entire locking portion fits into the concave portion. Therefore, the turntable can be reliably stopped. If the locking portion has no small protrusions and is flat, the locking portion may pass through the concave portion, but such a risk is reliably prevented.

(5) In the disk reproducing apparatus according to the fifth aspect, the rotation of the turntable can be completed, the disk reproducing unit can be raised and lowered, and the disk number can be detected by using two detecting members. In the case of the conventional example, four detection members are required to perform the above three detections, but the number of components is reduced.

(6) In the disk reproducing apparatus according to the sixth aspect, when reproducing the farthest disk, the cam rotating body only needs to be inverted by one rotation, and a slight control circuit is added to the disk reproducing apparatus as compared with the conventional example. Time loss has been greatly reduced, and accurate reproduction has become possible.

(7) In the disk reproducing apparatus according to the seventh aspect, when the turntable is not rotating, the elevating shaft moves up in response to the rise of the disk reproducing unit, and the elevating shaft is inserted into the center hole of the disk. At the same time, since the disk receiving portion attached to the elevating shaft supports the disk and lifts it above the disk mounting portion of the turntable, the disk was in close contact with the disk mounting portion when replacing the disk. As compared with the conventional example, the lifted disk can be easily picked up, and the disk can be easily replaced. Further, since the lifting shaft is inserted into the center hole of the disk, the disk is not displaced from the predetermined disk mounting portion by a slight vibration.

(8) In the disk reproducing apparatus of the eighth aspect, when the lid is closed, the retaining cylinder provided on the lid is inserted into the elevating shaft inserted through the disk center hole. Therefore, even when the disk reproducing device is moved or when a large vibration or impact is applied to the disk reproducing device, it is possible to prevent the disk from falling out of the elevating shaft.

(9) In the disk reproducing apparatus according to the ninth aspect, when the lid is closed, the retaining cylinder presses the disk, and the retaining cylinder is in contact with the disk receiving portion of the elevating shaft. Even if the disc is sandwiched between them, the spring contracts and absorbs and reduces the pressing force.
Damage to the disk can be avoided while positioning the disk reliably.

[0041]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a disk reproducing apparatus according to the present invention (CD reproducing apparatus with a rotary changer). Here, an embodiment in the case where the number N of the disc mounting portions in the turntable is N = 3 will be described.

FIG. 1 is a plan view of an initial state of a disk reproducing apparatus according to an embodiment, FIG. 2 is a sectional view thereof, and FIG. 3 is an enlarged plan view of a main part thereof. FIG. 4 is a plan view showing a state where the disk reproducing unit is lowered, and FIG. 5 is a sectional view thereof. FIG. 6 is a plan view when the turntable is rotated, and FIG. 7 is a sectional view thereof. FIG. 8 is a plan view when the rotation of the turntable is completed, and FIG. 9 is a sectional view thereof.

First, each component will be described with reference to FIGS.

Reference numeral 1 denotes a base, which rotatably supports a turntable 2 and mounts a disk reproducing section 3 so as to be able to swing up and down about a support section 3a.
Reference numeral 4 denotes a turntable stop lever. A cam rotating body 5 is rotatably supported on the base 1, and the turntable stop lever 4 is slidable along the arrow direction AB through a cam 5 a provided on the cam rotating body 5. And is attached to the base 1. Reference numeral 6 denotes a mechanical chassis, and a cam rotor 5, a counter gear 7, a worm wheel 8, and a shift lever 9 are rotatably mounted on the mechanical chassis 6, respectively.

The cam rotating body 5 has a cam 5b for raising and lowering the shift lever 9 around the side surface thereof.
A pin 9a provided on the shift lever 9 is inserted into the, and the shift lever 9 is changed from an up state to a down state and further to an up state by one rotation of the cam rotating body 5. Further, a cam 5c is provided on the bottom surface of the cam rotator 5, and a part of the cam 5c is applied to an ascending position detection switch 10 attached to the mechanical chassis 6 so that the end of one rotation operation of the cam rotator 5 can be detected. , And the ascending position detection switch 10 is operated.

The gear portion of the cam rotor 5 has a two-stage shape, the first stage is an all-around gear, and the second stage is provided with a missing tooth portion 5d. Is 1
The gear meshes at the second gear, and meshes with the counter gear 7 at the second gear. The counter gear 7 meshes with the cam rotor 5 and also meshes with the gear 2 a of the turntable 2. The worm 11 is press-fitted into the motor 12 mounted on the mechanical chassis 6, the worm 11 meshes with the worm 11, and the rotational driving force of the motor 12 is
1, a worm wheel 8, a cam rotating body 5, a counter gear 7, and a gear portion 2a are transmitted to the turntable 2.

The mechanical chassis 6 to which these parts are attached is attached to the base 1 such that the shift lever 9 is elastically engaged with the disc reproducing section 3 by the engaging section 9b. A disc number detection switch 13 is provided on the base 1, while a disc number detection member 14 is provided on the back surface of the turntable 2, and the disc number detection member 1 is turned while the turntable 2 is rotating.
4, the disc number is detected based on the number of times the disc number detection switch 13 is pressed. A spring 15 always pulls the turntable stop lever 4 inward in the radial direction.

The above are the main components, and the operation will be described below with reference to the drawings.

FIG. 1 shows an initial state of the CD reproducing apparatus with a rotary changer. In this state, the compact disk 16 is placed on the CD mounting position provided on the turntable 2 or taken out therefrom. be able to. At this time, for example, the disc number “2”
When it is desired to reproduce the compact disk 16 placed on the motor 12, the motor 12 is rotated counterclockwise by an external signal. Then, the worm wheel 8 meshing with the worm 11 rotates counterclockwise, the cam rotator 5 meshing with the worm 11 starts rotating clockwise, and the cam 5c comes off the rising position detection switch 10. The turntable stop lever 4 moves in the direction of arrow A (radially outward) along a cam 5a provided on the cam rotating body 5. This movement is completed before the end of the toothless portion 5 d provided on the cam rotor 5 engages with the counter gear 7. By this operation, the turntable stop lever 4 moves the concave portion 2b (N
= 3), the turntable 2 is unlocked, and the turntable 2 is in a rotatable state.

Simultaneously with the projecting operation of the turntable stop lever 4, the shift lever 9 descends along the cam 5b provided on the side surface of the cam rotor 5, and the shift lever 9 is engaged with the shift lever 9 by the engaging portion 9b. The combined disk reproducing unit 3 also moves down. 4 and 5 show this state.

Further, when the cam rotor 5 rotates clockwise, the toothless portion 5d of the cam rotor 5 ends, and at the same time, the cam rotor 5 meshes with the counter gear 7 and rotates the counter gear 7 counterclockwise. Let it. As a result, the turntable 2 in which the gear portion 2a meshes with the counter gear 7 starts rotating clockwise. The rotating state of the turntable 2 at this time is as shown in FIGS.

Here, the rotation angle of the turntable 2 is
360 ° / 3 = 120 °, the number of teeth of the counter gear 7 and the number of teeth of the cam rotor 5 so that only Z / 3 can be rotated with respect to the number of teeth Z of the gear portion 2a provided on the back surface of the turntable 2. The number of teeth other than the missing tooth portion 5d is set.

Further, as the cam rotor 5 continues to rotate,
Before the turntable 2 reaches a predetermined angle (120 °) (for example, at 100 °), the turntable stop lever 4 is moved by a spring 15 along a cam 5 a provided on the cam rotating body 5 in the direction of arrow B (radius). (Inward in the direction) and comes into contact with the outer peripheral surface of the turntable 2. Until then, the tip of the turntable stop lever 4 is separated from the outer peripheral surface of the turntable 2. At this time, the cam 5a is not in contact with the turntable stop lever 4. In this state, the cam rotor 5 rotates,
When the turntable 2 has finished rotating by a predetermined angle, the turntable stop lever 4 is retracted by a spring 15 into a concave portion 2 b provided on the outer periphery of the turntable 2.

Thus, the rotation operation of the turntable 2 is completed and locked.

The compact disk 16 reaches above the disk reproducing unit 3.

At this time, the cam rotor 5 and the counter gear 7
Is disengaged, the toothless portion 5d of the cam rotor 5 again corresponds to the counter gear 7, and only the cam rotor 5 continues to rotate. This state is shown in FIGS.

During the rotation of the turntable 2, the disc number detecting member 14 provided on the back surface of the turntable 2 hits the disc number detecting switch 13 twice, thereby detecting the disc number “2”. .

After the turntable 2 is stopped, the cam rotor 5
, The shift lever 9 is raised by the cam 5b, the disc reproducing unit 3 engaged with the shift lever 9 by the engaging portion 9b is also raised, and the compact disc mounted on the disc number "2" is moved. 16 is loaded into the disk reproducing unit 3 and brought to the reproducing state.

At this time, the cam 5c provided on the cam rotator 5 comes into contact with the ascending position detection switch 10, and it is detected that the cam rotator 5 has made one revolution and all operations have been completed.
The motor 12 is stopped.

The above is the case where the disk with the disk number "2" which is the next disk is reproduced. When the disk with the farthest disk number "3" is reproduced, the above series of operations is repeated. The playback state can be brought back only by repeating the operation, and the disk playback unit 3 only performs the up and down operations twice, and the time loss can be reduced.
Need not be reversed to bring the farthest disk to the playback position.

Hereinafter, the control circuit of this embodiment will be described.

As shown in FIG. 10, the control circuit controls the motor driving means 22 based on the information from the disc number detecting switch 13 and the ascending position detecting switch 10 to control the turntable 2.
And a motor 12 having two functions of rotating the disk reproducing unit 3 and moving the disk reproducing unit 3 up and down. The ascending position detection switch 10 is "L" when the disk reproducing unit 3 is in the raised state, that is, when the compact disk can be reproduced, and is "H" at other times. The signal S1 output from the ascending position detection switch 10 is shown in FIG.
Shown in the upper row.

Also, the disc number detecting switch 1
Reference numeral 3 denotes a mechanical switch in which a disc number detecting member (rib) 14 provided on the back side of the turntable 2 is brought into contact with the rotation of the turntable 2 to open and close contacts as shown in FIG. It is. The operation is to output “H” when the turntable 2 is stopped, and to contact the disk number detection member 14 arranged at a predetermined position on the turntable 2 when rotating, so that “L” of a number corresponding to the disk number is output. Is output. The signal S2 output from the disk number detection switch 13 is shown in the lower part of FIG.

When reproducing the compact disk having the disk number "2" from the state where the disk number is "1", first, the control microcomputer 21 changes the signal S3 to the motor drive means 22 from "H" to "L". Switch to "." Then, the motor 12 that has been in the stopped state starts to rotate. Then, the disc reproducing unit 3 is lowered by the cam operation as described above, and the signal S1 from the ascending position detection switch 10 switches from “L” to “H”. The rotation of the turntable 2 is started following the complete lowering of the disk reproducing unit 3, and two disk number detecting members 14 corresponding to the disk number "2".
Comes into contact with the disk number detection switch 13, two "L" pulses (signal S2) are input to the control microcomputer 21, and the control microcomputer 21 recognizes that the disk number is "2". Thereafter, the rotation of the turntable 2 is mechanically stopped, and the disc reproducing unit 3 is raised by the cam operation. When the disc reproducing unit 3 is completely raised, the ascending position detecting switch 10 is set to "L" again, and the control microcomputer 2
1 switches the signal S3 to the motor driving means 22 from "L" to "H" to stop the rotation of the motor 12, and sets the signal S4 to "H" for a short time to perform a braking operation on the motor 12. (FIG. 12c). After a series of operations described above, the compact disc can be reproduced at the disc number "2". In order to reproduce the compact disc with the disc number "3", the above operation may be repeated twice.

As described above, rotation of the turntable 2, rotation of the disk reproducing unit 3 and detection of the disk number can be performed by one motor 12 and two switches 10 and 13. In general, it is only necessary to detect the disk number, and other operations are controlled by the mechanical system, so the circuit is very simple,
The reliability as a set has also improved.

The rotation of the motor 12 is only a forward rotation and a braking operation, and there is no need for a reverse rotation operation. Therefore, the motor driving means 22 also has a simple circuit configuration of three transistors. No complicated circuit configuration is required, and the output port of the control microcomputer 21 can be saved as compared with the conventional example.

The stop of the turntable 2 is reliably performed mechanically, and the lifting and lowering of the disk reproducing unit 3 is performed by one motor 1
Since the cam rotation by the cam rotating body 5 driven by the cam 2 is performed, the setting of the circuit detecting means is only the detection of the disk number and the ascending position, and not only is the mounting and design accuracy of the switch not required high, but also Can be improved.

Because of the above features, N = 3,
By limiting the rotation of the motor 12 only in the forward direction, the advantages of the present invention can be maximized.

When a mechanical switch is used as the disk number detecting switch 13, a sliding noise with the disk number detecting member 14 is generated when the turntable 2 rotates. This can be prevented by replacing the mechanical switch with a photo interrupter, but in this embodiment, the disc number detecting member 14 is connected to the turntable 2.
By reducing the contact speed by reducing the contact speed by providing the innermost peripheral portion, the cost is reduced as compared with the photo interrupter.

The turntable stop lever 4 is shown in FIG.
As shown in FIG. 3, it is conceivable that the locking portion 4 a has a small projection 4 b with a rounded tip that fits into the recess 2 b on the upper side in the rotation direction of the turntable 2. When the turntable stop lever 4 is pulled back in the direction of arrow B by the cam 5a and the spring 15, and comes into contact with the outer periphery of the turntable 2, it comes into contact with the rounded small projection 4b.
The contact area is small and the frictional resistance is small. Further, when the turntable 2 rotates in the above state and approaches the concave portion 2b, the turntable 2 first rotates with the small projection 4b fitted into the concave portion 2b as shown in FIG. When the turntable 2 stops, the small protrusion 4b abuts against the side wall 2c of the recess 2b of the turntable 2, the locking portion 4a of the turntable stop lever 4 is securely fitted into the recess 2b, and the turntable 2 is stably and reliably stopped. Will be done. If the locking portion 4a is flat without the small projections 4b, the locking portion 4a may pass through the concave portion 2b, but such a risk is surely prevented.

The following can be considered as a modification of the above embodiment. Cams 5a, 5 in the above embodiment
b, 5c and the missing tooth portion 5d are provided on the cam rotor 5 so as to be symmetrical with respect to the respective operation standards.
In the above-described series of operations, the turntable 2 can be rotated in any of the clockwise direction and the counterclockwise direction. Add a few control circuits, motor 12
Only by controlling the rotation direction of the turntable 2, the turntable 2 can be rotated 360 ° / N and −360 ° / N in the forward and reverse directions by one rotation of the cam rotor 5 shown in the above embodiment.

Next, another embodiment of the disk reproducing apparatus according to the present invention (CD reproducing apparatus with rotary changer)
Will be described with reference to FIGS. FIG.
FIG. 15 is a plan view of an initial state of the disc reproducing apparatus, and FIG.
1 is a front view of the initial state, FIG. 16 is a side view of the initial state, FIG.
7 is a front view of a state in which the disk reproducing unit is lowered, FIG. 18 is a side view of a state in which the elevating shaft is lowered, and FIG. 19 is an enlarged view showing a state in which the disk is not lifted and removed. This alternative embodiment has the same configuration as the previous embodiment except for the configuration described below, and the same reference numerals are given to the same portions, and description thereof is omitted.

A lock cam rotator 30 which is interlocked with the cam rotator 5 is rotatably supported by the mechanical chassis 6. A cam groove 30a having a gentle inclination is formed in the lock cam rotating body 30, and a swing frame 31 having a pin 31a engaged with the cam groove 30a is pivoted about a support shaft 31b at both ends thereof. It is mounted so that it can swing up and down. The swing frame 31 is a turntable 2
Is the disk reproducing unit 3
And the remaining two disk mounting portions 2d
Has a rectangular frame 31c at a location corresponding to the center of the frame. The lifting shaft 32 is provided with a pin 32 on each rectangular frame 31c.
It is pivotally supported around the horizontal axis through a.

An elongated hole 2e for scanning the optical pickup in the disk reproducing unit 3 is formed in the disk mounting portion 2d of the turntable 2. The diameter of the elevating shaft 32 is determined by the length of the scanning elongated hole 2e. The diameter of the center hole of the compact disc 16 is slightly smaller than the diameter of the center hole 16a.

The elevating shaft 32 is provided with a disk receiving portion 32b having a diameter larger than the diameter of the center hole 16a so that the compact disk 16 can be placed and supported.

The upper end of the elevating shaft 32 has a frustoconical shape,
The scanning slot 2e of the turntable 2 and the center hole 16a of the compact disc 16 can be inserted and removed. The base 1 also has a through hole (not shown) through which the elevating shaft 32 is inserted. Therefore, regardless of the swing of the swing frame 31, the elevating shaft 32 is guided by the through hole to be in a vertical posture. (See FIG. 18).

Reference numeral 33 shown in FIGS. 14 and 16 denotes a spring for urging the swing frame 31 upward. Reference numeral 34 denotes a swingable openable / closable cover that covers the upper part of the turntable 2. A retaining cylinder 34 a is integrally formed at two places on the lower surface of the top plate of the cover 34 corresponding to the two elevating shafts 32. Is formed. The retaining cylinder 34a is adapted to be fitted on the outer periphery of the elevating shaft 32 in a state where the lid 34 is closed, and in this state, the compact lifted by the disk receiving portion 32b of the elevating shaft 32. The length is set such that a clearance of about 1 mm is secured between the disk 16 and the upper surface. The inner diameter of the retaining cylinder 34 a is larger than the outer diameter of the elevating shaft 32.

As shown in FIG. 14, the pitch diameter of the cam rotator 5 and the lock cam rotator 30 is the same, and the timing is set so that the disk reproducing unit 3 and the elevating shaft 32 move up and down in conjunction with each other. The concave portion 5e formed on the cam rotating member 5 and the convex portion 30b formed on the lock cam rotating member 30 engage each time the cam rotating member 5 and the lock cam rotating member 30 make one rotation. Thus, the lifting and lowering of the disk reproducing unit 3 via the shift lever 9 and the raising and lowering of the swing frame 31 via the lock cam rotating body 30 are reliably linked.

The main components have been described above, and the operation will be described below with reference to the drawings.

FIGS. 14 to 16 show an initial state of the disk reproducing apparatus with a rotary changer. When the lid 34 is opened in this state, the compact disk 16 can be taken out or mounted (to be described in detail later). Do).

When replacing the compact disk 16 to be set in the disk reproducing unit 3, the motor 12 is driven to rotate the cam rotating body 5 clockwise. Then, first, the cam 5c of the cam rotating body 5 is moved to the ascending position detection switch 1.
0, the turntable stop lever 4 starts to come out of the concave portion 2b on the outer periphery of the turntable 2, and the cam 5b of the cam rotating body 5 causes the shift lever 9 to swing downward, and as shown in FIG. 18, the disc reproducing unit 3 engaged with the engaging unit 9b descends, and the lock cam rotating body 30 meshed with the cam rotating body 5 via a gear rotates counterclockwise. As shown, the pin 31a of the swing frame 31 is
And descends along the cam groove 30a of the lock cam rotor 30 with the support shaft portion 31b as the rotation center while the elevating shaft 32 descends vertically while being guided by the through hole of the base 1. It comes out of the retaining cylinder 34a and the scanning long hole 2e of the turntable 2 and is located below it. In this case, the compact disk 16 which has been lifted by the disk receiving portion 32b of the elevating shaft 32 is gently mounted on the disk mounting portion 2d of the turntable 2.

Next, the toothless portion 5d of the cam rotor 5 passes through the counter gear 7, and the gear of the cam rotor 5 meshes with the counter gear 7, so that the turntable 2 starts rotating.

When the turntable 2 is rotated clockwise by 120 °, the missing tooth portion 5d of the cam rotor 5 reaches the counter gear 7 and the transmission of the rotational force is interrupted, so that the rotation of the turntable 2 is stopped. 120 ° of turntable 2
With the rotation of, the next disk mounting portion 2 d is brought above the disk reproducing portion 3 together with the next compact disk 16. The turntable stop lever 4 is engaged with the recess 2b immediately before the turntable 2 stops and when the turntable 2 stops.

Even after the turntable 2 is stopped, the cam rotor 5
, The shift lever 9 is raised by the cam 5b, and the disk reproducing unit 3 engaged with the engaging portion 9b of the shift lever 9 is also raised, and the compact disk 16 which is newly opposed to the disk is removed. Attach it to the playback unit 3 to bring it into a playback state. At this time, the lock cam rotator 30 is rotated in conjunction with the cam rotator 5, and the portion of the cam groove 30a of the lock cam rotator 30 where the pin 31a of the oscillating frame 31 is slid is gradually inclined upward. The swing frame 31 is swung upward by the urging force of the spring 33, and the elevating shaft 3
2 is also raised vertically.

When the elevating shaft 32 is raised in this way, the elevating shaft 32 is
e, and then the center hole 16 of the compact disc 16
a, and the disk receiving portion 32b lifts the compact disk 16 from the disk mounting portion 2d. And
As shown in FIG. 19, the retaining cylinder 34a of the lid 34
The upper end portion of the elevating shaft 32 is fitted into the shaft. The distance between the lifted compact disc 16 and the retaining cylinder 34a is about 1 mm. By the cooperation of the lifting shaft 32 and the retaining cylinder 34a, the compact disk 16 can be held in the retaining state while being lifted from the disk mounting portion 2d. A short time after the elevating shaft 32 reaches its uppermost end, the cam 5c acts on the ascending position detection switch 10, the motor 12 stops, and the one rotation operation of the cam rotor 5 ends. Also, the concave portion 5e formed on the cam rotating body 5 and the convex portion 30b formed on the lock cam rotating body 30 are engaged.

The above operation steps are shown in the timing chart of FIG.

As described above, when the turntable 2 is not rotating, the elevating shaft 32 is
And the disk receiving portion 32b of the elevating shaft 32 supports the compact disk 16 and is lifted above the disk mounting portion 2d of the turntable 2, and at this time, the cover 34 The upper end of the elevating shaft 32 is fitted into the retaining cylinder 34a of
Even when the disk reproducing device is moved or when a large vibration or impact is applied to the disk reproducing device, the compact disk 16 does not fall out of the elevating shaft 32, and is located just above its normal position with respect to the disk mounting portion 2d. The positioning will be maintained. When the cover 34 is opened and the compact disk 16 is replaced, it is difficult to pick up the disk which is in close contact with the very shallow disk mounting portion 2d in the conventional example, whereas in the case of the present example, Since the compact disc 16 is supported by the disc receiving portion 32b of the elevating shaft 32 in a state where the compact disc 16 has already been lifted from the disc mounting portion 2d, the disc can be easily picked up and the disc can be easily replaced. .

FIG. 20 shows still another embodiment. The elevating shaft 32 having the disk receiving portion 32b is
and a spring 32d for urging the elevating shaft 32 upward.

In the case of this embodiment, even if the retaining cylinder 34a comes into contact with the upper surface (label surface) of the compact disc 16 when the lid 34 is closed, the moment the lid 34 is closed Can be absorbed and reduced by the contraction of the spring 32d, and the compact disk 16 can be prevented from being damaged.

In a normal state, the cover 34 is restored and the retaining cylinder 34a is positioned about 1 mm above the upper surface of the compact disk 16. However,
As shown in FIG.
May be kept in contact with the compact disc 16.

[0091]

【The invention's effect】

(1) According to the disk reproducing apparatus of the first aspect, when reproducing a disk separated by (360 ° / N) × k from the disk at the reproducing position, the cam rotating body may be simply rotated k times. This control is very simple.

(2) According to the disk reproducing apparatus of the second aspect, when the k-th disk is selected, the disk reproducing unit goes up and down k times, but the turntable only rotates the cam rotating body k times. Can be rotated to a desired position, and the disc reproducing unit can be reliably positioned at the proper reproducing position, so that the control is very simple and the switching time of the disc is short. In addition, since all means for turning the turntable, raising and lowering the disk reproducing unit, and detecting the amount of rotation are integrated in the cam rotor, these operations are inevitably synchronized with each other and operate accurately. And the number of parts is small. Also,
Since the rotation of the turntable and the raising and lowering of the disk reproducing unit are performed by one cam rotating body, only one motor is required.

(3) According to the disk reproducing apparatus of the third aspect, the rotation preventing member is driven by the cam rotating body, and the cam rotating body also drives the turntable and the disk reproducing unit. As a result, the rotation preventing member is driven, so that the accuracy and reliability can be improved. Further, since these are operated by one cam rotating body, the number of parts can be reduced. Furthermore, the rotation preventing member slides on the turntable only when the rotation preventing member is fitted to the turntable to perform the rotation preventing function, and otherwise does not slide, so that even if the diameter of the turntable is large, Regardless, the load applied to the turntable is small.

(4) According to the disk reproducing apparatus of the fourth aspect, when the engaging portion of the rotation preventing member slides on the small projection when sliding on the outer peripheral surface of the turntable, the contact area is small and the frictional resistance is small. Yes. Also, when the locking portion reaches the concave portion of the turntable, the small projection of the locking portion first fits into the concave portion, and then the small projection contacts the side wall of the concave portion, so that the entire locking portion fits into the concave portion. Therefore, the turntable can be reliably stopped.

(5) According to the disk reproducing apparatus of the fifth aspect, the rotation detection of the turntable, the elevation of the disk reproducing unit, and the detection of the disk number can be performed with two detecting members, and the number of parts can be reduced. You.

(6) According to the disk reproducing apparatus of the sixth aspect, when reproducing the farthest disk, the cam rotating body only needs to be inverted by one rotation, and the addition of a slight control circuit makes it possible to compare with the conventional example. As a result, time loss is greatly reduced, and reproduction can be performed accurately.

(7) According to the disk reproducing apparatus of the present invention, the elevating shaft raised in the non-rotating state of the turntable is inserted into the center hole of the disk, and the disk receiving portion of the elevating shaft mounts the disk on the disk. Since the disk is lifted above the mounting portion, when the disk is replaced, the lifted disk can be easily picked up, and the disk can be easily replaced. Further, since the lifting shaft is inserted into the center hole of the disk, it is possible to prevent the disk from being displaced from the predetermined disk mounting portion even with a slight vibration.

(8) According to the disk reproducing apparatus of the eighth aspect, the retaining cylinder provided on the lid is inserted into the elevating shaft inserted through the center hole of the disk, so that the disk reproducing apparatus can be moved. Even when a large vibration or impact is applied to the disk or the disk reproducing device, it is possible to reliably prevent the disk from falling out of the elevating shaft.

(9) According to the disc reproducing apparatus of the ninth aspect, when the lid is closed, the retaining cylinder presses the disk, and the retaining cylinder between the disc receiving portion of the elevating shaft and the retaining cylinder presses the disc. Even if the disk is sandwiched between them, the spring contracts and absorbs and relaxes the pressing force, so that the disk can be reliably positioned while avoiding damage to the disk.

[Brief description of the drawings]

FIG. 1 is a plan view of an initial state of a disk reproducing apparatus (CD reproducing apparatus with a rotary changer) according to an embodiment of the present invention.

FIG. 2 is a sectional view of an initial state of the disk reproducing apparatus according to the embodiment.

FIG. 3 is an enlarged plan view of a main part of an initial state of the disk reproducing apparatus according to the embodiment.

FIG. 4 is a plan view showing a state where a disk reproducing unit of the disk reproducing apparatus according to the embodiment is lowered.

FIG. 5 is a sectional view corresponding to FIG.

FIG. 6 is a plan view of the disk reproducing apparatus of the embodiment when the turntable is rotated.

FIG. 7 is a sectional view corresponding to FIG.

FIG. 8 is a plan view of the disk reproducing apparatus of the embodiment when rotation of the turntable is completed.

FIG. 9 is a sectional view corresponding to FIG.

FIG. 10 is a block circuit diagram illustrating a configuration of a control circuit according to an embodiment.

FIG. 11 is a schematic plan view showing a relationship between a disk number detection switch and a disk number detection member in the embodiment.

FIG. 12 is a timing chart showing a signal from a rising position detection switch and a signal from a disk number detection switch in the embodiment.

FIG. 13 is an enlarged plan view of a main part showing another embodiment of the turntable stop lever.

FIG. 14 is a plan view of an initial state of a disk reproducing apparatus (CD reproducing apparatus with a rotary changer) according to another embodiment of the present invention.

FIG. 15 is a front view of an initial state of another embodiment.

FIG. 16 is a side view of an initial state of another embodiment.

FIG. 17 is a front view showing a state where a disk reproducing unit according to another embodiment is lowered.

FIG. 18 is a side view of another embodiment in which the elevating shaft is lowered.

FIG. 19 is an enlarged view showing a state in which a disk of another embodiment is prevented from being lifted and removed.

FIG. 20 is an enlarged view showing a state in which the disk is prevented from being lifted and removed showing another embodiment of the lifting shaft.

FIG. 21 is a timing chart for explaining the operation of another embodiment.

FIG. 22 is a plan view showing a configuration of a conventional disk reproducing apparatus (CD reproducing apparatus with a rotary changer).

FIG. 23 is a block diagram showing a configuration of a conventional control circuit.

FIG. 24 is a schematic plan view showing the relationship between a turntable stop position detecting sensor and a disc number detecting sensor in a conventional example.

FIG. 25 is a timing chart showing a signal from a turntable stop position detecting sensor and a signal from a disk number detecting sensor in a conventional example.

[Explanation of symbols]

 2 ... Turntable 2a ... Gear part 2b ... Concave part 2c ... Side wall 2d ... Disc mounting part 2e ... Slotting hole 3 ... Disc reproducing part 3a ... Support part 4 ... Turntable stop lever 4a ... Lock part 4b ... Small protrusion 5 ... Cam rotating body 5a ... Cam 5b ... Cam 5c ... Cam 5d ... Tooth missing part 5e ... Recess 6 ... Mechanical chassis 7 ... Counter gear 8 ... Warm wheel 9 ... Shift lever 9a ... Pin 9b ... Engaging portion 10... Ascending position detection switch 11... Warm 12... Motor 13... Disc number detection switch 14... Disc number detection member 15. Spring 16... Compact disc 16 a. Lock cam rotating body 30a ... Cam groove 30b ... Convex part 31 ... Swing frame 31a ... Pin 31b ... Support shaft part 31c ... Rectangle Frame 32 ... Elevating shaft 32a ... Pin 32b ... Disc receiving part 32c ... Elevating shaft main body 32d ... Spring 33 ... Spring 34 ... Lid 34a ... Cylinder for retaining

Continuation of the front page (56) References JP-A-2-165465 (JP, A) JP-A-4-302850 (JP, A) JP-A-6-60520 (JP, A) (58) Fields investigated (Int) .Cl. ⁷ , DB name) G11B 17/22-17/30

Claims (9)

(57) [Claims] 1. A turntable provided so as to be rotatable and capable of placing N (N is an integer of 3 or more) disks at substantially equal intervals on a circumference centered on a rotation center, and the turntable A disc reproducing unit that is provided to be able to move up and down and that reproduces a disc that has been brought to an opposing position, a cam rotor that has a gear for rotating the turntable, and rotationally drives the cam rotor. and a motor, rotates the predetermined angle the turntable to play the desired disk out of the N disks, the disk reproducing apparatus for reproducing the desired disc by the disc reproducing unit, the turn From the gear on the table
A gear portion having an appropriate number of teeth to which a driving force is applied is provided.
On the other hand, a driving force is applied to the gear portion on the gear.
Teeth and a toothless portion that does not apply a driving force to the gear portion are provided.
And the number of teeth is one rotation of the cam rotor.
Therefore , the disc reproducing apparatus is set to a value at which the turntable rotates 360 ° / N. 2. A cam rotating body comprising: a cam for elevating and lowering a disc reproducing unit; a cam for detecting one rotation; and a detection switch corresponding to the cam for detecting one rotation. 2. The disk reproducing apparatus according to claim 1, wherein: 3. A turntable provided so as to be rotatable and capable of mounting N (N is an integer of 3 or more) disks at substantially equal intervals on a circumference centered on a rotation center, and said turntable. a disc reproducing portion for reproducing Kitasa disk has a vertically movably provided opposite position with respect to one rotation
Therefore, a gear for rotating the turntable by 360 ° / N
A cam rotator having
And a desired motor among the N disks
Turn the turntable at a predetermined angle to play the disc
The disc playback unit to rotate the disc.
In a disc playback device that plays back a disc,
When it is moved to the position facing the disc playback unit,
The member that prevents rotation of the turntable is
Attached so that it can slide in the radial direction of the table
At the same time, the rotation preventing member is operated by the cam rotating body.
A disc reproducing apparatus characterized in that a cam is provided . 4. A turntable provided so as to be rotatable and capable of placing N (N is an integer of 3 or more) disks at substantially equal intervals on a circumference centered on a rotation center, and said turntable. A disk reproducing unit that is provided to be able to move up and down and that reproduces a disk that has been brought to an opposing position, a cam rotor that has a gear for rotating the turntable, and rotationally drives the cam rotor. A desired disc among the N discs,
Turntable when brought to a position facing the raw part
A member for preventing rotation of the cam;
A cam for operating the rotation preventing member is provided on the rolling element,
By one rotation of the cam rotator, the turntable becomes 36
For disc playback devices set to rotate 0 ° / N
The rotation preventing member has a concave portion of the turntable.
A locking portion that fits into the locking portion is provided, and the locking portion
To the recess at the tip of the turntable
A disc reproducing apparatus, wherein a small projection to be fitted is formed . 5. A disk number detecting member provided on a back surface of the turntable, and a disk number detecting switch for detecting the disk number detecting member is provided. The disk reproducing device according to any one of the above. 6. The disk device according to claim 1, wherein the rotation of the turntable is made possible by making all the cam shapes of the cam rotating body symmetrical. 7. A turntable which is rotatable and has a plurality of disk mounting portions provided at substantially equal intervals on a circumference centered on a rotation center, and is provided so as to be able to move up and down with respect to the turntable. A disc reproducing unit for reproducing the disc brought to the opposite position, a cam rotating body having a gear for rotating the turntable and a cam for moving the disc reproducing unit up and down; In a rotating state, in response to lifting and lowering of the disk reproducing unit, the disk reproducing unit moves back and forth with respect to the center hole of the disk on the disk mounting unit other than the position facing the disk reproducing unit, and turns the disk while supporting the disk from below. A disc reproducing apparatus, comprising: a lifting shaft with a disk receiving portion for raising and lowering the table. 8. A lid for covering the upper part of the turntable, wherein the lid is provided with a retaining cylinder inserted into the outer periphery of the elevating shaft inserted through the center hole of the disk. 8. The disc reproducing apparatus according to 7. 9. The disc reproducing apparatus according to claim 8, wherein the lifting shaft is vertically slidably mounted on the lifting shaft main body, and a spring for urging the lifting shaft upward is provided. .