JPH0438657A - Changer type disk reproducing device - Google Patents

Abstract

PURPOSE:To easily select a desired carriage by providing a first carriage selecting switch which selects a preliminarily determined carriage and a second carriage selecting switch which selects carriages other than the preliminarily determined carriage in the order of a loop. CONSTITUTION:A first carriage selecting switch 45 is operated to select prelimi narily determined one of (n) carriages 1 to 6. In the following reproducing operation, the single play operation to reproduce only the disk on this carriage is set, and a desired carriage other than the preliminarily determined carriage is selected by a required number of times of operation of a second carriage selecting switch 46. In the following reproducing operation, the changer play operation to reproduce the disk in order on this carriage and disks on following carriages is set. Thus, the desired carriage is selected to improve the operability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a changer-type disc playback device, and more particularly to a changer-type disc playback device equipped with a tray.

[Prior Art] Conventionally, a changer-type disc playback device is known in which a magazine into which a plurality of carriages carrying discs are inserted is mounted, and the discs in the magazine can be selectively played.

In this device, when attempting to play a disc that is not inserted into the magazine, first remove the magazine from the device, pull out the carriage from inside the magazine, place the disc to be played on the carriage, and then insert it into the magazine. The magazine had to be reattached to the device, making it difficult to operate.

Therefore, as described in Japanese Utility Model Application No. 62-195257, a changer-type playback device was proposed which was equipped with a tray into which a carriage similar to the carriage in a magazine was inserted, and this device was commercialized ( US JVC
XL-M2O3) and sold in the USA.

[Problems to be Solved by the Invention] When the above-mentioned device (XL-M2O3) finishes playing back the disc on the carriage P inserted into the I-ray, it then transfers the disc on the carriage in the magazine to the carriage 1. Since the discs are played in order from
~6 is believed to be the same disk.

This device also has a switch P on the front panel for selecting/playing the disc on the carriage P, and a switch P on the carriages 1 to 6.
Although switches 1 to 6 are provided for selecting and reproducing the upper disks, when the reproduction of the disk on the carriage specified by these switches is completed, the remaining disks are thereafter sequentially reproduced in order of carriage number.

For example, if the switch P is operated with the disc on the carriage P, 2.5, the carriage P, 2.5
After the disks on the carriage 2.5 are sequentially reproduced, the apparatus enters a stopped state, and when the switch 2 is operated, the disks on the carriage 2.5 are sequentially reproduced and then the apparatus enters a stopped state.

In this way, although this device is equipped with a tray, it performs a single play operation (playback operation only for a single disk) on only the disk on the carriage P in the tray, similar to the conventional single-player playback device that only has a tray. It had the disadvantage that it could not be done.

Further, although it is possible to immediately select a desired disk on the carriage by operating any one of the switches P, 1 to 6, the large number of switches makes the design of the front panel 1 to panel complicated.

Therefore, it may be possible to provide an UP switch and a DOWN switch to specify the carriage number in an up or down manner, but unless the current carriage number is confirmed by a display etc., how many times do you have to press the switch to select the desired carriage? It has the disadvantage of being difficult to understand and has poor operability.

[Means for Solving the Problems] The present invention provides a changer-type disc playback device that eliminates the above-mentioned drawbacks, and includes n carriages each having a disc loading section on which a disc can be placed. , a tray with a single slot into which the carriage can be inserted and removed;
a tray moving means for moving a tray into which one of the carriages is inserted between an eject position in which it projects outside the apparatus and a load position stored in the apparatus; A stocker having n possible slots, and a stocker moving means for moving the stocker to n positions where each slot of the stocker is at the same height as a slot I~ of the tray brought to the loading position. a carriage moving means for moving the carriage between the tray brought to the loading position and the stocker brought to any of the n positions; and a carriage inserted into the tray brought to the loading position. When the disc reproducing means for reproducing the disc on the top and the tray are brought to the loading position, the disc reproducing means and the carriage inserted in the tray are moved relatively, and the disc on the carriage is mounted on the disc reproducing means. a first carriage selection switch that selects a predetermined one carriage out of n carriages; and a first carriage selection switch that selects a predetermined carriage from among the n carriages; Second to choose
and a control means for controlling each moving means based on the operation of the first and second carriage selection switches.

[Function 1 or more] The device of the present invention selects a predetermined one carriage out of n carriages by operating the first carriage selection switch, and in the subsequent playback operation, the device selects a predetermined one of the n carriages. This is a single play operation in which only the upper disc is played, and a desired carriage other than the predetermined carriage is selected by operating the second carriage selection switch a required number of times. A changer play operation is performed in which the disc on the carriage and the discs on the carriages after the carriage are sequentially played.

[Example] Hereinafter, an example of the apparatus of the present invention will be described with reference to the drawings.

(1) Mechanism explanation Figure 1 schematically shows the mechanism of the device of the present invention, in which the tray 7 has a single-play carriage S equipped with a disc loading section inserted into a slot (not shown) from the left side of the drawing. The disk has been inserted, and the disk on the carriage S has been brought to the load position where it can be placed on standby.

The optical head base 11 is equipped with a spindle motor 9 to which a disk mounting table 8 is attached, and an optical head 10 that is movable in the access direction to read information recorded on the disk, and lifts the disk on the carriage S to a magnetic clamper. 12 to the up position for clamping.

A disk sensor 13 fixedly disposed below the tray 7 detects the presence or absence of a disk on the carriage through an opening (not shown) formed in the tray 1 and the carriage S (formed in all carriages). It is something.

On the other hand, a stocker 14 corresponding to a conventional magazine is provided inside the device so as to be movable up and down, and is at a position S where a carriage S for single play can be inserted and removed from the right side of the figure in the slot 15 at the top end in the figure. slot 16-2
Carriages 1 to 6 for changer play are inserted into 1, respectively.

The tray/carriage moving mechanism 22 uses a tray motor 23 as a driving source, and moves the tray 7 and the disk on the carriage inserted into the tray 7 to a standby loading position (second
Figure (A)) and the eject position that protrudes from the front panel 24 and allows the disc to be placed on the carriage (Figure 2 (A)).
B)), and the carriage alone can also be moved between the load position and the store position (FIG. 2(C)) where it is inserted into the slot of the stocker 14.

The eject position detection switch 25 and the store position detection switch 27 are for detecting the above-mentioned in 191~ position and store position, respectively, by mechanically detecting the operating position of the 1-head tray/carriage moving mechanism 22. The position detection sensor 26 optically detects the operating position of the tray/carriage moving mechanism 22 to detect the load position and the speed deceleration section when bringing the tray/carriage to the load position (details will be explained later). ).

The optical head base vertical mechanism 28 uses a clamp motor 29 as a driving source, and moves the optical head base 11 into an up position (Fig. 3 (A)) and a down position M (Fig. 3 (B)) in which the tray 7 and carriage can be moved. The tray lock mechanism 30 is released from the locked state by moving the optical head base 11 from the up position to the down position while keeping the optical head base 11 in the down position. It is something. Note that the tray lock mechanism 3o enters a locked state by engaging with the tray 7 brought to the loading position, and prevents the tray 7 from shifting.

The up position detection switch 31, the down position detection switch 32, and the unlock detection switch 33 detect the above-mentioned up position, down position, and unlock, respectively, by mechanically detecting the operating position of the optical radar base vertical mechanism 28. It is something.

The stocker 14 is moved from the position S (FIG. 4A) where the carriage S can be inserted and removed, and the position 1 (where the carriage 1 can be inserted and removed) using the movement motor 35 as a driving source. 4 (B)), . . . can be moved to a position 6 (Fig. 4 (G)) where the carriage 6 can be inserted and removed.

The stopper position detection sensor 36 detects each of the above positions by optically detecting the operating position of the stopper moving mechanism 34, and the reference position detection switch 37 is located on the bottom surface of the stopper 14. By engaging, it is detected that the stocker 14 has been lowered to a position approximately halfway between the position S and the position 1.

(2) Description of control circuit The operation control circuit of the above-mentioned mechanism will be explained below with reference to FIG.

One end of each of the switch I to switch 41, eject/load switch 42, playback switch 43, stop switch 44, carriage S selection switch 45, and carriage 1-6 selection switch 46, which select the operation mode, is grounded, and the other end is grounded. The terminals are connected to the power supply B through resistors R1 to R6, respectively, and receive the S1Heck signal 5TOCK and the eject/
Load signal τ operation, playback mode signal PLAY, stop mode signal 5TOP, carriage S selection signal I carriage 1
The lower two -6 selection signals are output to the microcomputer 40.

Further, the load position sensor 26, disk sensor 13, and switch position sensor 36 described above have one end connected to the ground, and the other end connected to the power supply B via the resistors R7 to R9, respectively, so that they are connected to the load position. The signal LOAD, the disk detection signal D-DET, and the stocker position signal 100 copies are output to the microcomputer 40.

Further, one end of each of the reference position detection switch 37, down position detection switch 32, eject position detection switch 25, and store position detection switch 27 is connected to the ground, and each other end is connected to the power supply B through the respective resistors RIO1R12 to R14. and outputs a reference position signal R-PO8, an up position signal .pi., an eject position signal EJECT, and a store position signal STORE, respectively, to the microcomputer 4o. and,
One end of each of the up position detection switch 31 and the lock release detection switch 33 is connected to the ground, and the other end is connected to the power supply B through the resistor R11.
Outputs Wπ with the down position signal ■ to 0.

Therefore, as shown in FIG. 6, when the tray 7 is brought to the eject position, the eject position detection switch 25 is turned on and the eject position signal EJECT becomes "L". The store position signal 5TORE indicates that when the carriage is brought to the store position, the store position detection switch 27 is turned on and becomes rtL''.The load position signal LOAD indicates that the tray 7 or the carriage speed decelerates before and after the load position. When it reaches sections S1 and S2, it becomes HII, and the load position section S
When the carriage is brought to the disk detection zone S4, which is wider than the load position zone S3, the disk sensor 13 can detect the presence or absence of a disk. Signal knee] Σ
If there is a disk on the carriage, T becomes IIL'' in the disk detection section S4.

On the other hand, as shown in FIG. 7, when the up position signal UP is optically brought to the up position, the up position detection switch 31 is turned on and becomes "L", and the tray lock is activated. When the mechanism 30 is unlocked, the lock release switch 33 is turned on and “L” again.
When the optical head 11 is brought to the down position, the down position detection switch 32 is turned on and the down position signal DOWN becomes 11L.

Further, as shown in FIG. 8, the stocker position signal 5-
pos becomes rr L II every time the stocker 14 is brought to each of the above positions S, 1 to 6, and the reference position signal R-
When the stocker 14 descends from approximately the middle between position S and position 1, PO8 turns on the reference position detection switch 37 and becomes "L".

Further, the microcomputer 40 (FIG. 5) detects changes in the state of each of the above signals based on a flowchart described later, and sends a front signal FRONT and a rear signal REAR to the tray motor drive circuit 47 that drives the tray motor 23. A clamp up signal CL-UP and a clamp down signal CL are sent to the clamp motor drive circuit 48 that drives the motor 29.
-D○WN, and a stocker up signal 5T-U to the stocker motor fan circuit 49 that drives the stocker motor 35.
P and stocker down signal 5T-DOWN are output.

Note that the tray motor drive circuit 47 receives the front signal FRO.
When NT becomes irH", the tray motor 23 outputs a voltage that causes the tray 7 to rotate in the direction in which the tray 7 moves to the load position. When the rear signal REAR becomes rrH", the tray motor 23 outputs a voltage in the direction that the tray 7 moves to the load position. outputs the voltage that causes it to rotate.

In addition, when the clamp up signal CL-UP becomes tLHII, the clamp motor 2 movement circuit 48 moves the clamp motor 2 in the direction in which the optical Radbase 11 moves to the up position.
9 outputs a rotating voltage, and a clamp down signal CL-
When DOWN becomes "IIH", a voltage is output to the optical system that causes the clamp motor 29 to rotate in the direction in which the Radbase 11 moves to the down position.

Then, the stocker motor agitating circuit 49 moves the stocker 10 to the position S when the stocker up signal 5T-UP becomes "H".
When the stocker down signal 5T-DOWN becomes "H", the stocker motor 35 outputs a voltage that causes the stocker motor 35 to rotate in the direction in which the stocker 1° moves to position 6.

(3) Flowchart Description A flowchart showing a program executed by the microcomputer 40 mentioned above will be described below.

Note that in flowchart 1- described below, Do-
D6 indicates the presence or absence of a disk in the carriage S, 1 to 6, respectively. For example, D3=1 indicates that the carriage 3 has a disk. In addition, m is the carriage and stocker 14 currently in use.
m=O indicates that the carriage S (O) is in use and the stocker 14 is at position S, m=1 indicates that the carriage 1 is in use and the stocker 14 is at position 1. ..., m=6 indicates that the carriage 6 is in use and the stocker 14 is at position 6. Furthermore, the memory that stores this information is equipped with a backup battery, so that it will not be erased even if the power to the device is turned off.

■Flowchart in Stopped State FIGS. 9(A) to 9(D) show a flowchart in stopped state. In the loop of steps 81 to S5, the stock signal 5TOCK, the eject load signal 100%, the playback mode signal PLAY, The falling edge of the carriage S selection signal 1-6 and the carriage 1-6 selection signal 1-6 is detected.

When the stock switch 41 is operated, step S1 becomes Y.
ES, set n to 1 in step S6, and proceed to step 8.
In a loop from 7 to S9, from D1 to D6, whether or not it is O is searched for, that is, from carriage 1 to carriage 6, a carriage without a disc is searched for. If there is a carriage without a disc and step S7 becomes YES, subroutine L1
The optical head base 7 is moved from the up position to the down position.

A flowchart of the subroutine L1 is shown in FIG. 10, and in step SIO the clamp down signal CL-DOWN is
is set to "H", the RAD base 11 is lowered to the optical system, and the fall of the down position signal - 100% is detected in the loop of step Sll. Then, when the optical Radbase 11 is lowered to the down position, step Sll becomes YES, and the clamp down signal CL -D O is output in step S12.
WN is set to LL L II to stop the optical head base 11 from descending.

When subroutine L1 ends, subroutine L2 moves the carriage at the load position to the store position (inside the stocker).

A flowchart of subroutine L2 is shown in FIG. 11. In step 320, the rear signal REAR is set to II H11 to move the carriage in the store direction, and in step S2
In loop 1, the fall of RE is detected at the stocker position signal 〒. Then, when the carriage moves from position S1 to position A, step S21 becomes YES, and step S822
Then, the rear signal REAR is set to "IIL" to stop the movement of the carriage.

When the subroutine L2 ends, the stocker 14 is moved to the position n set in step S6 or S8 (a position where the carriage n without a disc can be inserted and removed) in the subroutine L3.

A flowchart of subroutine L3 is shown in FIG. 12, and in step S30 it is determined whether n is smaller than m,
The target position n of the stepper 14 is smaller than the current position m,
That is, when moving downward, step S30 becomes YES, and the stocker down signal 5T-DOWN is set to tt Hu in step S31 to move the stocker 14 downward. Then, steps 832 to S
Each time a fall of the stocker position signal 5-pos is detected in the loop of 34, 1 is subtracted from m, and m is the same as n, that is,
When it is detected that the stocker 14 has moved to the target position n, the answer in step S34 becomes YES, and in step 835, the stocker down signal 5T-DOWN is set to /IL'' to stop the movement of the stocker 14.

Further, when the target position n is higher than the current position m, step 830 becomes No, and the stocker up signal 5T-UP is set to ``rrH'' in step S36, and the stocker 14
move upward. Then, steps 837 to S39
In the loop, 1 is added to m every time a fall of the stocker position signal 5-pos is detected, and when it is detected that m is the same as n, that is, that the stocker 14 has moved to the target position n, step S39 is YES. Then, in step S40, the stocker up signal 5T-UP is set to "L 11" and the stocker 1
Stop the movement of 4.

When subroutine L3 ends, subroutine L4 moves the carriage once from the store position (inside the stocker) to the load position.

A flowchart of subroutine L4 is shown in FIG. 13. In step S50, the front signal FRONT is set to "Hn" to move the carriage in the eject direction, and in the loop of step S51, the rise of the load position detection signal LOAD is detected. Deceleration section SL (Fig. 6)
When the movement reaches , step S51 becomes YES, and as shown in FIG. 22(A) in steps 852 to S60, the front signal FRONT is set at a cycle of 10 m5 and the duty cycle is increased until the fall of the load position detection signal LOAD is detected. Decrease the carriage movement speed by setting the pulse output to 50% and stop it accurately at the loading position.

When the subroutine L4 is finished, the tray lock mechanism 3 is moved to the optical base by the rad base moving mechanism 28 in the subroutine L5.
Unlock 0.

A flowchart of the subroutine L5 is shown in FIG. 14, and in step S70 the clamp down signal CL-DOWN is
is set to "H", the optical Rad base moving mechanism 28 is operated in the direction of lowering the optical Rad base 11, and a fall of 1 is detected in the up position signal in the loop of step S71. When the tray lock mechanism 30 is unlocked and the unlock detection switch 33 is turned on, step S7
1 becomes YES, and in step S72, the clamp down signal CL-DOWN is set to "IIL" to stop the operation of the optical to rad base moving mechanism 28.

When the subroutine L5 ends, the tray 7 and the carriage are moved to the eject position in a subroutine L6.

A flowchart of subroutine L6 is shown in FIG. 15, and in step S80, the FRONT signal FRONT is set to "H".
The tray 7 and the carriage are moved in the eject direction, and the load position signal LOA is output in a loop of step S81.
Detect the falling edge of D.

Tray 7 and carriage speed deceleration section S2 (Figure 6)
Move in the eject direction until it comes out, and step S
81 becomes YES, and in step S82, the clamp up signal CL-UP is set to LL H11, and the RAD base moving mechanism 28 toward the optical side is moved in the direction of raising the RAD base 11 toward the optical side.
is operated, and the rise of the up position signal UP is detected in the loop of step S83.

When the lock release detection switch 33 is turned off and the optical base moving mechanism 28 is operated until the tray lock mechanism 30 is in the lockable position again, step S83
becomes YES, and in step S84, the clamp-up signal CL-UP is set to "L" and the optical head base moving mechanism 2
8 is stopped, and the fall of the eject position signal EJECT is detected in a loop of step S85. Tray 7
When the carriage moves to the eject position, the front signal FRONT is set to "L" in step S86 to stop the carriage.

When this subroutine L6 ends, the process proceeds to a flowchart (FIG. 18) for the eject state, which will be described later.

On the other hand, in the loop of steps 87 to S9, if the carriages without a disc are sequentially searched for from carriages 1 to 6, but there are discs in all of them, step S9 becomes YES, and the operation of the stock switch 41 is substantially ignored. Proceed to step S2.

Next, when the eject/load switch 42 is operated, step S2 becomes YES, and the above-mentioned subroutine L
After moving the optical head base 7 from the up position to the down position in subroutine L5 (Fig. 10) and unlocking the tray lock mechanism 30 by the optical head base moving mechanism 28 in subroutine L5 (Fig. 14), subroutine L6 to move the traymer and carriage to the eject position, and follow the flowchart (18th
Proceed to Figure).

Next, when the playback switch 43 is operated, step S3 becomes YES, and in step S90 it is determined whether D (rn) is 1, that is, whether there is a disc in the carriage currently in use, and YES is determined. Then, in step S91, the playback mode is set and the flowchart in the playback state (described later) is executed.
Proceed to Figure 21).

On the other hand, if the result in step S90 is No, n is set to 1 in step S92, and Dl
From Carriage 1 to Carriage 6, a search is made to see if the number is 1 or not, from Carriage 1 to Carriage 6 in order. There is a carriage with a disc, and step S93 is Y.
When ES is reached, subroutine Ll (Figure 10) moves the optical Radbase 7 from the up position to the down position.
In subroutine L2 (FIG. 11), the carriage at the load position is moved to the store position (inside the stocker), and in subroutine L3 (FIG. 12), the stocker 14 is moved to step S9.
0 or to the position n set in S94 (a position where the carriage n with a disc can be inserted and removed), and in subroutine L4 (Fig. 13), the carriage is moved to the store position (
In subroutine L7, the optical head base 7 is moved from the down position to the up position.

A flowchart of subroutine L7 is shown in FIG. 16. In step 5100, the clamp up signal CL-UP is set to "IIH" to raise the radbase 11 to the optical system, and in the loop of step 5101, the fall of the up position signal π-t is detected. Then, when the optical radar base 11 rises to the up position, step 5IOI becomes YES, and the clamp up signal CL-UP is set to II in step 5102.
L” to stop the RAD base 11 from rising to the optical position.

When this subroutine L7 is completed, in step S91 the program is set to playback mode and proceeds to flowcharts 1 to (FIG. 21) in the playback state, which will be described later.

On the other hand, if the loop of steps 893 to S95 sequentially searches for carriages with discs from carriages 1 to 6, but none of them contain discs, and the result in step 895 is YES, the operation of the playback switch 43 is substantially ignored and the process proceeds to step S4. move on.

Next, when the carriage S selection switch 45 is operated, step S4 becomes YES, and m is set to O in step 5110.
In other words, it is determined whether the carriage currently in use is S or not. If YES, there is no need to change the carriage, so the operation of the carriage S selection switch 45 is substantially ignored and the process proceeds to step S5. .

On the other hand, if Step 5Lio is No, subroutine Ll (Fig. 10) moves the optical Radbase 7 from the up position to the down position, and subroutine L2 (Fig. 11)
The carriage at the loading position is moved to the S1 position (inside the stocker) in subroutine L8, and the stocker 14 is moved to position S in subroutine L8.

A flowchart of subroutine L8 is shown in FIG. 17, and in step 5120 stocker down signal 5T-DOW is
Set N to "H" and lower the stocker 14, step 8
121 to 5123, each time the stocker position signal 5-POS falls, m is subtracted by 1, and the stocker reference signal R-PO3 is
When the fall of the stocker 14 is detected and the stocker 14 is lowered to between position S and position 1 and step 5123 becomes YES,
In the loop of step 5124, the stocker position signal S:man
Detects the falling edge of Then, when the stocker 14 descends to position S, step 5124 becomes YES, step 5125 resets m to 0, and step 8126
The stocker down signal 5T-DOWN is set to "L" to stop the movement of the test lever 14.

As described above, according to the subroutine L8, the stocker position signal π-pos changes the value of m indicating the stocker current position to zr.
Since it is reset to O at the fall of the stocker position signal 5-pos after it becomes "L", even if there is a discrepancy between the value of m and the actual position of the stocker 14 due to a counting error, etc., the stocker 14 can be moved to its position. It can be returned by moving the stocker 14 to the S position.Steps 5121 and 122 correspond to interrupt processing, and the value of m always indicates the position of the stocker 14 even while the stocker 14 is moving to the S position. It is set up like this.

When subroutine L8 ends, subroutine L4 (first
3), the carriage S is moved from the store position M (inside the stocker) to the load position, and subroutine L7 (Fig. 16) is performed.
Then move the optical base 7 from the down position to the up position, and proceed to step S5.

Next, when the carriage 1-6 selection switch 46 is operated, step S5 becomes YES, and m
is 0, that is, whether the currently used carriage is S. If YES, step 5131 determines whether n is 0.
1, and in the loop of steps 8132 to 5134, D
From carriage 1 to carriage D6, search is made to see if it is 1 or not, that is, from carriage 1 to carriage 6, a carriage with a disc is searched for.

There is a carriage with a disc, and step 5134 is Y.
When ES is reached, the optical head base 7 is moved from the up position to the down position in subroutine Ll (Fig. 10).
In subroutine L2 (Fig. 11), the carriage S at the load position is moved to the store position (inside the stocker), and in subroutine L3 (Fig. 12), the stocker 14 is moved to step 5.
131 or 5133 (the position where the carriage n with a disc cover can be inserted and removed), and the carriage is moved to the position n set by the subroutine L4 (Fig. 13).
Then, in subroutine L7, the optical base 7 is moved from the down position to the up position, and the process returns to step S1 described above.

On the other hand, if there are no discs in all of the carriages 1 to 6 and the above-mentioned step 5134 becomes YES, then the carriages 1 to 6 are all empty.
The operation of the 6 selection switch 45 is substantially ignored and the process returns to step S1.

Further, if No in step 5130 described above, n is set to m+1 in step 5135, and steps 8136 to
Carriage m- in order from carriage n in a loop of 140
Look for a carriage with discs up to 1. For example, when m is 2 (carriage 2 is in use), carriages 3, 4.
Search for a carriage with a disc in the order of 5.6.1.

There is a carriage with a disc, and step 5137 is Y.
When ES is reached, subroutine Ll (Figure 10) moves the optical Radbase 7 from the up position to the down position.
In subroutine L2 (Fig. 11), the carriage at the load position is moved to the store position (inside the stocker), and in subroutine L3 (Fig. 12), the stocker 14 is moved to step 89.
0 or to the position n set in S94 (a position M where the carriage n with a disc can be inserted and removed), and subroutine L4. (FIG. 13), the carriage is moved from the store position (inside the stocker) to the load position, and in subroutine L7 (FIG. 16), the optical rad base 7 is moved from the down position to the up position, and the process returns to step S1.

On the other hand, carriages 1 to 1 other than the carriage m currently in use
If there is no disc in the carriage 1-6 and the answer in step 8136 is YES, the operation of the carriage 1-6 selection switch 45 is substantially ignored and the process returns to step S1.

■Flowchart in eject state Fig. 18 (A
) to (C) are flowcharts in the eject state, and in the loop of steps 8150 to 5153, the stock signal τ〒100 and the eject load signal E/L are shown.
, detects the falling edge of the reproduction mode signal PLAY and the rising edge of the eject position signal JECT.

When the stock switch 41 is operated, step 5150
becomes YES, and in step 5160 it is determined whether m is O, that is, whether the carriage currently in use is S. Since the carriage S is basically used for single play, it is not moved directly from the eject position to the store position, so if step 5160 becomes YES, the operation of the stock switch 41 is substantially ignored and the process proceeds to step 5151. .

On the other hand, if the carriage is not S but No in step 8160, subroutine L9 moves tray 7 to the loading position.
Move the carriage to the store position.

A flowchart of subroutine L9 is shown in FIG. 19, and in step 8180, the rear signal REAR is set to "H",
The tray 7 and the carriage are moved in the store direction, and the fall of the load position signal LOAD is detected in step 8181.

Then, the tray 7 and the carriage are in the loading position section S3.
(Figure 6), step 5181 is YES.
Then, in step 8182, the disk detection signal D-DE
It is detected whether T is "IIL", that is, whether there is a disk on the carriage, and if YES, step 8183
D (m) is set to 1 in step 5184, and D (m) is set to 0 in step 5184, and in a loop of step 8185, it is detected whether or not the S1 to A position signals 5TORE have fallen.

The carriage moves to the store position, step 818
5 becomes YES, the rear signal REA is activated in step 8186.
Set R to L''' to stop the carriage movement.

When subroutine L9 ends, step S161 returns D.
Determine whether (m) is 1 or not, and if YES, step 8
In step 162, n is set to 1, and in a loop of steps 8163 to 165, from Dl to D6, whether or not O is found, that is, from carriage 1 to carriage 6, a carriage without a disc is searched for.

There is a carriage without a disc, and step 8163 is Y.
When ES is reached, subroutine L3 (FIG. 12) moves the stocker 14 to the position n set in step 5162 or 5164 (position where carriage n with a disk can be inserted and removed), and subroutine L4. (Figure 13)
The carriage is moved from the store position (inside the stocker) to the load position, and the tray lock mechanism 30 is unlocked by the optical rad base moving mechanism 28 in subroutine L5 (Fig. 14), and then subroutine L6 (first
5), the tray 7 and the carriage are moved to the eject position, and the process proceeds to step 8151.

On the other hand, if the loop of steps 8163 to 8165 searches for carriages without a disc in order from carriages 1 to 6, and all of them have discs, step 8165
is YES, n is set to 1 in step 8166, and the stocker 14 is moved to position 1 in subroutine L3 (Fig. 12).
In subroutine L4 (FIG. 13), the carriage 1 is moved from the storage position (inside the stocker) to the load position, and in subroutine L7, the optical head bed 7 is moved from the down position to the amplifier position. The process proceeds to the flowchart (FIG. 9) in the above-mentioned stopped state.

Further, if the above-mentioned step 8161 becomes No, n is set to 1 in step 8167, and steps 8168 to 17
In a loop of 0, it sequentially searches from Dl to D6 to see if it is 1 or not, that is, from carriage 1 to carriage 6, it searches for a carriage with a disc.

There is a carriage with a disc, and step 8168 is Y.
When ES is reached, subroutine L3 (Fig. 12) moves the stocker 14 to the position n set in step 5167 or 5169 (a position where the carriage n with a disc can be inserted and removed), and subroutine L4 (Fig. 13) The carriage is moved from the store position (inside the stocker) to the load position, and the optical head bed 7 is moved from the down position to the up position in subroutine L7, and the process proceeds to the flowchart for the above-mentioned stopped state (FIG. 9).

On the other hand, in the loop of steps 8168 to 5170, if the carriages with discs are searched in order from carriages 1 to 6, but there are no discs, step 5170 is performed.
becomes YES, the stocker 14 is moved to position S in subroutine L8 (Fig. 17), and subroutine L4 (first
3) to move the carriage from the store position (inside the stocker) to the load position, and in subroutine L7 to move the optical Radbase 7 from the down position to the up position.
The process proceeds to the flowchart (FIG. 9) in the above-mentioned stopped state.

Next, when the eject/load switch 42 is operated or the 1-ray in the eject position is pushed in the load direction and the eject position detection switch 25 is turned off, step 5151 or 5152 becomes YES, and subroutine LIO and move the carriage from the eject position to the load position.

A flowchart of the subroutine LIO is shown in FIG. 20, and in step 5190, the rear signal REAR is
I, the tray 7 and the carriage are moved in the store direction, and the load position signal ROA is output in a loop of step 5191.
Detect the rising edge of D.

When the tray 7 and the carriage move to the speed deceleration section S2 and step 5191 becomes YES, step 819
2 to 5200, the rear signal REARk period is 10 m5 and the duty ratio is 5 as shown in Fig. 22 CB).
The pulse output is set to 0% to reduce the moving speed of the tray 7 and the carriage, and the fall of the load position signal ROAD is detected.

Then, the tray 7 and the carriage are in the loading position section S3.
If you move to , step 5195 or 5199 is YE.
S, and the movement of the tray 7 and carriage is stopped.

When the subroutine LIO ends, in step 5210, it is detected whether the disk detection signal D-DET is "L", that is, whether there is a disk on the carriage.

There is a disk on the carriage and step 5210 is Y.
When it becomes ES, D(m) is set to 1 in step 5217,
In subroutine L7, the optical rad base 7 is moved from the down position to the up position to clamp the disk on the carriage, and the above-mentioned flowchart in the stopped state (
Proceed to Figure 9).

On the other hand, if there is no disk on the carriage, step 521
If 0 becomes No, D(m) is set to ◯ in step 5211, and in step 5212 it is determined whether m is ◯, that is, whether the carriage currently in use is S or not.

The carriage currently in use is S and the step ≦212 is YE.
When S is reached, the optical head base 7 is immediately moved from the down position to the up position in subroutine L7, and the process proceeds to the above-described flowchart for the stopped state (FIG. 9).

On the other hand, the carriage currently in use is not S but step 52.
If 12 becomes NO, the carriage at the load position is moved to the store position (inside the stocker) in subroutine L2 (Fig. 11), n is set to 1 in step 5213, and the carriage is sequentially moved from Dl to D6 in a loop of steps 8214 to 216. 1
In other words, from carriage 1 to carriage 6, a search is made for carriages containing a disc.

There is a carriage with a disc, and step 5214 is Y.
When ES is reached, subroutine L3 (Fig. 12) moves the stocker 14 to the position n set in step 5213 or 5215 (a position where the carriage n with a disc can be inserted and removed), and subroutine L4 (Fig. 13) The carriage is moved from the S1-A position (S1-A position) to the -D load position, and the optical head bed 7 is moved from the DOWN position to the UP position in subroutine L7. Proceed to Figure 9).

On the other hand, in the loop of steps 8214 to 8216, if the carriages with discs are searched in order from carriages 1 to 6, but there are no discs, step 8216 is performed.
becomes YES, the stocker 14 is moved to position S in step L8 (Fig. 17), the carriage is moved from the store position (inside the stocker) to the load position in subroutine L4 (Fig. 13), and subroutine L7 (Fig. Figure 16)
Move the RAD base 7 from the down position to the up position and follow the flowchart l~( in the stopped state described above).
Proceed to Figure 9).

Next, when the playback switch 43 is operated, step 51
53 becomes YES, subroutine L10 (Figure 2o)
The tray 7 and the carriage are moved from the eject position to the load position, and in step 5220 it is detected whether the disc detection signal D-DET is "IIL", that is, whether there is a disc on the carriage.

There is a disc on the carriage and step 5220 is Y.
When ES is reached, move the optical Radbase 7 from the down position to the up position in subroutine L7 (Fig. 16).
After instructing the playback mode in step 5222, the process advances to flowchart 1- in the playback state, which will be described later.

On the other hand, if there is no disk on the carriage, step 522
If 0 becomes NO, in step 5224 it is determined whether m is O or not.
That is, it is determined whether the carriage currently in use is S, and if the carriage is S and step 5224 is YES, the optical head base 7 is moved from the down position to the up position in subroutine L7 (FIG. 16). After that, the process proceeds to the flowchart for the stopped state described above.

On the other hand, the carriage currently in use is not S, and step 5
If 224 becomes NO, n is set to 1 in step 5225, and in a loop of steps 8226 to 228, from D1 to D6, whether it is 1 or not, that is, from carriage 1 to carriage 6, a carriage with a disk is searched for.

There is a carriage with a disc, so step 226 is YES.
When S is reached, subroutine L2 (Fig. 11) moves the carriage at the load position to the store position (inside the stocker), and subroutine L3 (Fig. 12) moves the stocker 14 to the position n (set in step 5225 or 5227). (Position where carriage n with disc can be inserted and removed)
In subroutine L4 (Figure 13), the carriage is moved from the store position (inside the stocker) to the load position, and in subroutine L7 (Figure 16), the optical Radbase 7 is moved from the down position to the up position. After
Proceed to the flowchart in the stopped state described above. On the other hand, in the loop of steps 8226 to 8228, carriages with discs are sequentially searched for from carriages 1 to 6, but if none of them have discs, step 5228 is performed.
becomes YES, subroutine L2 (Figure 11) moves the carriage at the load position to the store position (inside the stocker), and subroutine L8 (Figure 17) moves the carriage from step 1 to load 1.
4 to position S, and subroutine L4 (Fig. 13)
After moving the carriage from the slide position (inside the stocker) to the load position, and moving the optical base 7 from the down position to the up position in subroutine L7 (Fig. 16), Proceed to the flowchart in the state.

■Flowchart in playback state Figures 21 (A) to (D) show flowcharts in playback state, and the loop of steps 8230 to 5235 ends with stock signal 5TOCK, eject load signal down T, and stop mode signal π7. , playback mode signal PL
AY, Carriage S selection signal Wind Carriage 1-6 selection signal D: Detect each falling edge of τ and the end of disk reproduction.

When the stock switch 41 is operated, step 8230
becomes YES, and in step 5240, n is set to 1, and in the loop of steps 5241 to 5243, from D1 to D6, whether or not O is found, that is, from carriage 1 to carriage 6, a carriage without a disc is searched for.

There is a carriage without a disc, and step 5241 is Y.
When ES is reached, after instructing the stop mode in step 5244, the optical Radbase 7 is moved from the up position to the down position in subroutine Ll (Fig. 10), and the carriage in the loading position is moved in subroutine L2 (Fig. 11). In subroutine L3 (Fig. 12), the stocker 14 is moved to the position n set in step 5240 or 5242 (a position where the carriage n with a disc can be inserted and removed). , subroutine L4 (Fig. 13) moves the carriage from the store position (inside the stocker) to the load position, and subroutine L5
(FIG. 15), the tray lock mechanism 30 is unlocked by the optical rad base moving mechanism 28, and in subroutine L6 (FIG. 15)), the ray 7 and the carriage are moved to the eject position, and the above-mentioned eject state is achieved. Proceed to the flowchart (FIG. 18).

On the other hand, in the loop of steps 8241 to 5243, if the carriages without a disc are searched for in order from carriages 1 to 6, and all of them have discs, step 5243 is performed.
becomes YES, the operation of the stock switch 41 is substantially ignored and the process proceeds to step 5231.

Next, when the eject/load switch 42 is operated, step 5231 becomes YES, step 5245 instructs the stop mode, and subroutine LL (Figure 10) moves the optical Radbase 7 from the up position to the down position. Then, in subroutine L5 (FIG. 15), the tray lock mechanism 30 is unlocked by the optical base moving mechanism 28, and then the tray 7 and the carriage are moved to the eject position in subroutine L6, and the flowchart in the eject state described above is performed. Proceed to 1. (Figure 18).

Next, when the stop switch 44 is operated, step 523
2 becomes YES and instructs the stop mode in step 8246, "Flowchart 1 in double stop state"
- Proceed to (Figure 9).

Next, when the carriage S selection switch 45 is operated, step 5233 becomes YES, and step 5250 selects m.
is O or not, that is, whether the carriage currently in use is S or not. If YES, there is no need to change the carriage, so the operation of the carriage S selection switch 45 is substantially ignored and step 5234 is performed. Proceed to.

On the other hand, if the result in step 5250 is No, step 52
After entering the stop mode in step 51, subroutine LL (10th
) to move the optical base 7 from the up position to the down position, subroutine L2 (Fig. 11) to move the carriage in the load position to the store position (inside the stocker), and subroutine L8 (Fig. 17) to move the carriage to the stocker. 14 to position S, and subroutine L4. (Fig. 13), the carriage S is moved from the stocker position (inside the stocker) to the loading position, and subroutine L7 (Fig. 16) moves the optical base 7 from the down position to the up position. At step 5252, it is determined whether or not DO is 1, that is, whether or not there is a disk on the carriage S.

If there is a disc on the carriage S and step 5252 becomes YES, step 5253 sets the playback mode, and then the process advances to step 5234.

However, there is no disc in the second carriage, step 52.
If 52 becomes No, the process proceeds to the flowchart for the above-mentioned stopped state (FIG. 9).

Next, when the carriage 1-6 selection switch 46 is operated, step S234 becomes YES, and step 8260
In step 8261, it is determined whether m is O or not, that is, whether the carriage currently in use is S or not.
Set n to 1, and in a loop of steps 8262 to 8264 check whether it is 1 or not from Dl to D6 in order, that is, carriage 1.
Search for carriages with discs in order from 6 to 6.

There is a carriage with a disc, and step 8262 is Y.
When ES is reached, after instructing the stop mode in step 8280, the optical Radbase 7 is moved from the up position to the down position in subroutine Ll (Fig. 10), and the carriage S in the loading position is moved in subroutine L2 (Fig. 11).
is moved to the store position (inside the stocker), and in subroutine L3 (FIG. 12), the stocker]4 is moved to the position n set in step S261 or S263 (a position where the carriage n with a disc can be inserted and removed), Subroutine L4. (Figure 13) to move the carriage to the store position (
In subroutine L7, the RAD base 7 is moved from the down position to the up position, and after instructing the playback mode in step 8281, the process advances to step S235.

On the other hand, if there are no discs in all of the carriages 1-6 and the above-mentioned step 264 becomes YES, then the carriages 1-6
Substantially ignoring the operation of the selection switch 45, step S
Proceed to 235.

Also, the carriage is not S but the step S260 described above.
If the result is NO, n is set to m+1 in step S265, and a carriage with a disc is searched for in order from carriage n to carriage m-1 in a loop of steps S266 to S270.

There is a carriage with a disc, and step 8267 is Y.
When ES is reached, the stop mode is set in step S280, and then the optical Radbase 7 is changed to subroutine Ll (Fig. 10).
is moved from the up position to the down position, the carriage in the load position is moved to the store position (inside the stocker) in subroutine L2 (Fig. 11), and subroutine L3 (
12), the stocker 14 is moved to step 890 or S9.
4 (a position where the carriage n with a disk can be inserted and removed), and the subroutine L4
(Fig. 13) to store the carriage at position M (inside the stocker)
to the load position, and subroutine L7 (16th
After moving the optical head bed 7 from the down position to the up position in FIG. 10 and instructing the playback mode in step 8281, the process advances to step 5235.

On the other hand, carriages 1 to 1 other than the carriage m currently in use
If there is no disc in the carriage 1-6 and the result in step 8266 is YES, the operation of the carriage 1-6 selection switch 45 is substantially ignored and the process proceeds to step 5235.

Next, when it is detected that the reproduction of the last song has ended based on a signal from a signal processing circuit (not shown), step 52
At step 90, a stop mode is set, and at step 5291, it is determined whether or not m is O, that is, whether or not the carriage currently in use is S.

If the carriage is S and step 5291 is YES, the above flowchart in the stopped state (FIG. 9)
Proceed to.

On the other hand, if the carriage is not S and the result in step 5291 is NO, n is set to m+1 in step 'S 292, and in a loop of steps 8293 to 295, carriages with discs are searched for from carriage n to carriage 7 in order.

If there is a carriage with a disk and step 5293 becomes YES, subroutine Ll (Figure 10) moves the optical head base 7 from the up position to the down position, and subroutine L2 (Figure 11) moves the carriage in the loading position. In subroutine L3 (Fig. 12), move the stocker 14 to the position n set in step 5292 or 5294 (position where carriage n with a disc can be inserted and removed). In subroutine L4 (FIG. 13), the carriage is moved from the store position (inside the stocker) to the load position, and in subroutine L7 (FIG. 16), the optical head base 7 is moved from the down position to the up position. Then, it is determined whether D (n) is 1 or not, that is, whether there is a disk on carriage n.

Most likely, step 5293 becomes YES, and step 82
Step 8296 is definitely YES because it has progressed to 96.
Then, after instructing the playback mode in step 5297,
Returning to step 5230 described above.

On the other hand, in the loop from steps 8293 to 5295, carriages with discs were searched for from carriage n to carriage 7, but there were no carriages with discs.
If step 5295 becomes YES, subroutine LL
(Fig. 10) moves the optical Radbase 7 from the up position to the down position, subroutine L2 (Fig. 11) moves the carriage in the load position to the store position (inside the stocker), and subroutine L8 (Fig. 17) ) to move the stocker 14 to position S, and subroutine L4 (13th
), the carriage is moved from the store position (inside the stocker) to the load position, and subroutine L7 (first
6), the optical rad base 7 is moved from the down position to the up position, and in step 8296 it is determined whether D(n) is 1, that is, whether there is a disk on carriage n.

If there is a disc on the carriage S, step 8296 becomes YES, step 5297 instructs the reproduction mode, and then the process returns to step 5230 described above.

On the other hand, if there is no disc on the carriage S, step 8
296 becomes No, and the process proceeds to the flowchart (FIG. 9) for the above-mentioned stopped state.

(4) Operational Description An example of the operation of the apparatus of the present invention will be described below with reference to the above-described flowchart.

First, the operation when the stock switch 24 is operated to store six discs will be explained.

Note that, as shown in FIG. 23(A), the carriage S
is brought to the load position and all carriages are empty of discs.

When the stock switch 41 is operated, the microcomputer 40 advances through steps S1, S6, S7, and subroutine L1 in the flowchart in the stopped state shown in FIG. 23(B)), subroutine L2 sets the carriage S to the store position (FIG. 23(C)), subroutine L3 sets the stocker 14 to position 1 (FIG. 23(D)),
Further, in subroutine L4, the carriage 1 is moved to the loading position (FIG. 23(E)).

Then, in subroutine L5, the tray 7 is unlocked (not shown), and in subroutine L6, the tray 7 is unlocked.
and move the carriage 1 to the eject position (second
Figure 3 (F)).

When the disk D is placed on the carriage 1 that has been moved to the eject position (FIG. 23 (G)) and the stock switch 41 is operated again, the microcomputer 40 is activated as shown in FIG. 18 (A).
The flowchart in the eject state shown in ) advances to steps 5150 and 8160 and subroutine L9, and in subroutine L9, the tray 7 is moved to the load position and the carriage 1 is moved to the store position (FIG. 23 (■)).

Incidentally, when the tray 7 and the carriage 1 pass the loading position (FIG. 23 (G)), in step 8183 (FIG. 19), Dl indicating the presence or absence of a disk in the carriage 1 is memorized as 1 (disk present).

Therefore, the microcomputer 40 performs steps 5161.5162.
Proceed to step 5163, this time n is 2 and step 8163 is Y
ES, and the stocker 14 is moved to position 2 in subroutine L3.
(Fig. 23 (J)), subroutine L4 moves the carriage 2 to the loading position (Fig. 23 (K)), subroutine L5 unlocks the tray 7 (not shown), and subroutine L6 moves the carriage 2 to the loading position (Fig. 23 (K)). Move the carriage 2 to the eject position (Fig. 23 (L)
When the disk D is placed on the carriage 2 that has been moved to the eject position (FIG. 23 (M)) and the stock switch 41 is operated again, the carriage on which the disk is placed is placed in the stocker in the same manner as described above. 14, and moves the carriage without a disk to the eject position.

Then, after the last carriage 6 is moved to the eject position (FIG. 23 (N)) and the disk D is placed (FIG. 23 (0)), when the stock switch 41 is operated again, the same as described above is performed. Then, in subroutine L9, set tray 7.
is moved to the load position and the carriage 6 is moved to the store position (FIG. 23(Q)). When the tray 7 and the carriage 6 pass through the load position (FIG. 23(P)), D6, which indicates the presence or absence of a disk in the carriage 6, is memorized as 1 (disc present) in step 5183 (FIG. 19).

Therefore, since the microcomputer 40 stores D1 to D6 as all 1, step 8165 becomes YES, and subroutine L3 moves the stocker 14 to position 1 (Fig. 23 (R).
)), the carriage 1 is moved to the loading position in subroutine L4 (Fig. 23 (S)), the optical rad base 11 is moved to the up position in subroutine L7, and the disk D on the carriage 1 is placed in standby (Fig. 23 (T)). ), the process proceeds to the flowchart in the stopped state (FIG. 9) and waits for input of the operation switch.

Next, as shown in FIG. 24(A), the operation when the stock switch 41 is operated without a disk being placed on the carriage 3 at the eject position will be described. Note that the disk D is placed only on the carriage 1.2.

When the stock switch 41 is operated, the microcomputer 40 advances the flowchart in the eject state shown in FIG. )).

Note that when the tray 7 and the carriage 3 have moved to the loading position (Fig. 24(B)), step 8184 (first
9), set D3, which indicates the presence or absence of a disk in carriage 3, to O(
(no disk) is stored in memory.

Therefore, the microcomputer 40 performs steps 5161.5167.
516B, step 8168 becomes YES when n=1, subroutine L3 sets the stocker 14 to position 1 (Fig. 24 (D)), subroutine L4 sets the carriage 1 to the loading position (Fig. 24 (E)), Then, in subroutine L7, move the optical Radbase 11 to the up position,
When the disk D on the carriage 1 is placed on standby (FIG. 24(F)), the process proceeds to the flowchart for the stopped state and waits for input of the operation switch.

Next, as shown in FIG. 25(A), the operation will be described when the switches 1 to 41 are operated without a disk being placed on the carriage 1 at the eject position. Note that no disks are placed on any of the carriages.

When the stock switch 41 is operated, the microcomputer 40 advances the flowchart in the eject state shown in FIG. Figure (C)).

When the tray 7 and the carriage 1 pass through the loading position (FIG. 24(B)), in step 8184 (FIG. 19), Dl indicating the presence or absence of a disk in the carriage 1 is memorized as O (no disk).

Therefore, the microcomputer 40 performs step 5161, S]67.
Step 5168 is entered, and since all D1 to D6 are stored as O, step 5170 is YES and subroutine L is entered.
8, the stocker 14 is moved to position S (Fig. 25 (D)), and subroutine L4 moves the carriage S to the loading position (Fig. 25 (D)).
(Fig. 25 (E)), and in subroutine L7 move the optical Radbase 11 to the up position (Fig. 25 (F)),
Proceeding to flowchart 1 in the stopped state, the system waits for input from the operation switch.

Next, as shown in FIG. 26(A), the carriage S
The operation when the stock switch 41 is operated while the above disc is being played will be explained. In addition, the remaining carriages 1 to 6
There are no discs installed in all of them.

When the switches 1 to 41 are operated, the
) in the playback state shown in step 5230. S24. O, S24.1.5244, the stop mode is instructed in step 5244 (Fig. 26 (B)), the optical head base 11 is moved to the down position in subroutine L1 (Fig. 26 (C)), and the carriage is moved in subroutine L2. S to the store position (Fig. 26 (D)), and the stocker 14 to position 1 in subroutine L3 (Fig. 26 (D)).
E)), the carriage 1 is moved to the loading position in subroutine L4 (FIG. 26(F)).

Then, in subroutine L5, the tray 7 is unlocked (not shown), and in subroutine L6, the tray 7 is unlocked.
and move the carriage 1 to the eject position (second
(Fig. 6 (G)) Waits for the input of the operation switch.

First, the operation when the eject/load switch 42 is operated to place a disk on the carriage S will be explained. Note that, as shown in FIG. 27(A), the carriage S has now been brought to the loading position.

When the eject/load switch 42 is operated, the microcomputer 40 proceeds through the flowchart in the stopped state shown in FIG. Figure (B)), subroutine L5 and tray 7
(not shown), subroutine L2
to move the carriage S to the eject position (27th
Figure (C)).

The disc D is placed on the carriage S that has been moved to the eject position (Fig. 27 (D)), and the disc D is ejected again.
When the load switch 42 is operated, the flowchart in the eject state shown in FIG. 18(B) advances to step 5151, subroutine L], O, and the tray 7 and carriage S are moved from 61 to section S2 (FIG. 6). It is moved to the loading position while decelerating the moving speed (FIG. 27(E)).

The microcomputer 40 proceeds to steps 5210 and 5217, and
Memorize O as 1, move the optical rad base 11 to the up position in subroutine L7, put the disk D on the carriage S on standby (Fig. 27 (F)), and go to flowchart 1 in the stopped state (Fig. 9). The machine advances and waits for the input of the operation switch.

Next, as shown in FIG. 28 (A'), the operation when the eject/load switch 42 is operated without placing a disk on the carriage S at the eject position will be described.

When the eject/load switch 42 is operated, the microcomputer 40 advances the flowchart in the eject state shown in FIG.
2 (FIG. 6), the moving speed is reduced while moving to the loading position (FIG. 28(B)).

The microcomputer 40 proceeds to steps 5210 and 5211, and
O is memorized as ○, and the process proceeds to step 5212. However, since the carriage is S, step 5212 becomes YES, and in subroutine L7, the optical head head 11 is moved to the up position (Fig. 28 (C)), and the flowchart in the stopped state is executed. The process advances to steps 1 to 1 (FIG. 9) and waits for input of the operation switch.

Next, the operation when the eject switch 42 is operated to take out all the disks on the carriages 1 to 6 housed in the apparatus will be described. Note that, as shown in FIG. 29(A), the carriage 1 has been brought to the loading position, and the disk D on the carriage 1 is on standby.

When the eject/load switch 42 is operated, the microcomputer 40 advances the flowchart in the stopped state shown in FIG. 29(B)), the tray 7 is unlocked in subroutine L5 (not shown), and the carriage 1 on which the disc D is placed is moved to the eject position in subroutine L2 (FIG. 29(C)).

When the disk D is taken out from the carriage 1 (FIG. 29(D)) and the eject/load switch 42 is operated again, the flowchart in the eject state shown in FIG. 18(B) is executed at step 5151 and subroutine LIO. Proceed and move tray 7 and carriage 1 to section S2
(FIG. 6), the moving speed is reduced while moving to the loading position (FIG. 29(E)).

The microcomputer 40 proceeds to steps 5210 and 5211, and
l is memorized as O, step 5212, subroutine L
2 to move the carriage 1 to the store position (FIG. 29(F)).

Then, the microcomputer 40 proceeds to steps 5213 and 5214, and when n is 2, step 5214 becomes YES, and in subroutine L3, the stocker 14 is moved to position 2 (Fig. 29 (G
)), in subroutine L4, the carriage 2 is moved to the loading position (Fig. 29 (H)), and in subroutine L7, the optical rad base 11 is moved to the up position, and the carriage 2 is moved to the up position.
The upper disk D is put on standby (Fig. 29 (1)).

Thereafter, in the same manner as in the second series, when the eject/load switch 42 is operated, the carriage on which the disk is placed is moved to the eject position, and the disk is taken out.

Then, when the eject/load switch 42 is operated while the disk D on the last carriage 6 is on standby (FIG. 29(J)), the microcomputer 40 is placed in the stopped state shown in FIG. 9(A). The flowchart proceeds to step S2, subroutine L1, and subroutine L1.
to move the optical head base 1] to the down position (second
9(K)), the tray 7 is unlocked in subroutine L5 (not shown), and the carriage 6 on which the disc D is placed is moved to the eject position in subroutine L2 (FIG. 29(L)).

When the disk D is taken out from above the carriage moved to the eject position (Fig. 29 (M)) and the eject/load switch 42 is operated again, the carriage is moved to the eject position.
), the flowchart for the eject 1 to state progresses to step 5151 and subroutine LIO, and the tray 7 and carriage 1 are moved to the loading position (second
Figure 9 (N)).

The microcomputer 40 proceeds to steps 5210 and 5211, and
6 is memorized as ○, step 5212, subroutine L
2 to move the carriage 6 to the store position (FIG. 29(F)).

Then, the microcomputer 40 proceeds to steps 5213 and 5214, and when n=7, step 8216 becomes YES, and in subroutine L8, the switch 14 is moved to the position S (see FIG. 29).
P)), the carriage S is moved to the loading position in subroutine L4 (Fig. 29 (Q)), and the optical rad base 11 is moved to the up position in subroutine L7 (Fig. 29 (R)), and the flow in the stopped state is The program advances to chart 1 (FIG. 9) and waits for the operation switch to be input.

Next, as shown in FIG. 30(A), the carriage S
A single play operation when the playback switch 43 is operated while the upper disc is on standby will be explained. Note that the disk is placed only on the remaining carriages 2, 4, and 6.

When the playback switch 43 is operated, the microcomputer 40
The flowchart in the stopped state shown in FIG. 30(B) progresses through steps S3, S90, and S91, and the playback mode is instructed.The flowchart in the stopped state shown in FIG. 30(B) and FIG. Waits for input or detection of end of playback of the last song.

When the playback of the last song is finished, the microcomputer 40 proceeds to steps 5235 and 5290 in the flowchart in the playback state shown in FIG. 5291 is YE
Flowchart in the stopped state (Fig. 9)
, and waits for the operation switch to be input again.

Next, as shown in FIG. 31(A), the carriage 2
The changer play operation when the playback switch 43 is operated while the upper disk is on standby will be described. Note that the disk is placed only on the remaining carriage S, 4.6.

When the playback switch 43 is operated, the microcomputer 40
The flowchart in the stopped state shown in Figure (B) is shown in steps S3, S90. The process advances to step S91, in which the playback mode is instructed (FIG. 31(B)), and the flowchart for the playback state shown in FIG. 21 waits for the input of the operation switch and the detection of the end of playback of the final song.

When the playback of the last song is finished, the microcomputer 40 proceeds to steps 5235.3290 in the flowchart in the playback state shown in FIG. 529
Proceed to 2.5293.

When n is 4, the microcomputer 40 returns YES in step 5293, moves the optical head bed 11 to the down position in subroutine L1 (FIG. 31 (D)), and moves the carriage 2 to the S1 to A positions in subroutine L2 (FIG. 31). (E)), move the stocker 14 to position M4 in subroutine L3 (Fig. 31 (F)),
In subroutine L4, carriage 4 is moved to the loading position (third
1 (G)), and in subroutine L7, the optical head base 11 is moved to the up position, and the disk D on the carriage 4 is put on standby (FIG. 31 (H)). The program then proceeds to steps 8296 and 5297, instructs the playback mode (FIG. 31 (■)), waits for the input of the operation switch, and the detection of the end of playback of the final song.

When the playback of the last song is finished, the microcomputer 40 again proceeds to steps 5235 and 5290, and instructs the stop mode (FIG. 31 (J)), and steps 5291 and 5292.
．． Proceed to 5293.

When n is 6, the microcomputer 40 returns YES in step 5293, moves the optical head bed 11 to the down position in subroutine L1 (Fig. 31 (K)), and moves the carriage 4 to the store position in subroutine L2 (Fig. 31 (L)). ), the stocker 14 is moved to position 6 in subroutine L3 (Fig. 31 (M)
), subroutine L4 moves carriage 4 to the loading position (
In subroutine L7, the optical disc base 11 is moved to the up position, and the disk D on the carriage 6 is put on standby (FIG. 31(O)). The program then proceeds to steps 8296 and 5297, instructs the playback mode (FIG. 31(P)), and again waits for the operation switch to be input and the end of playback of the final song to be detected.

When the playback of the last song is finished, the microcomputer 40 again proceeds to steps 5235 and 5290, instructs the stop mode (FIG. 31 (Q)), and steps 8291 and 5292.
．． Proceed to 5293.

When n is 7, the microcomputer 40 returns YES in step 5295, moves the optical base 11 to the down position in subroutine L1 (Fig. 31 (R)), and moves the carriage 6 to the store position in subroutine L2 (Fig. 31 (S)). ), the stocker 14 is moved to position S in subroutine L8 (Fig. 31 (T)).
In subroutine L4, the carriage S is moved to the loading position (FIG. 31 (U)), and in subroutine L7, the optical head base 11 is moved to the up position, and the disk D on the carriage S is put on standby (FIG. 31 (V)). )). The program then proceeds to steps 8296 and 5297, instructs the playback mode (FIG. 31 (W)), and again waits for the operation switch to be input and the end of the playback of the last song to be detected.

When the final song has been played, the microcomputer 40 proceeds to steps 5235 and 5290 and instructs the stop mode (FIG. 31 (X)). Step 5291 becomes YES, and the flowchart for the stopped state (FIG. 9) is executed. The screen advances and waits for the operation switch to be input again.

In the above operation example, when there is no disc on the carriage S, the carriage S is moved to the rotary position in subroutine L4 (FIG. 32(A)), and subroutine L7 is
to move the optical head base 11 to the up position (third
2(B)), and since step 8296 becomes No, the flowchart in the stopped state (FIG. 9)
, and waits for the operation switch to be input again.

Next, as shown in FIG. 33(A), the operation when the playback switch 43 is operated with the carriage S without a disc in the loading position and the optical rad base brought to the up position. Explain. Note that the disk is placed only on the remaining carriage 2.

When the playback switch 43 is operated, the microcomputer 40
The flowchart in the stopped state shown in FIG. Proceeding to S92.893, when n is 2, step 93 becomes YES, subroutine L1 moves the optical Radbase 11 to the down position (Fig. 33 (B)), and subroutine L2 moves the carriage S to the store position (Fig. 33). (C)), the stocker 14 is placed in position 2 in subroutine L3 (Fig. 33 (D)), the carriage 2 is placed in the loading position in subroutine L4 (Fig. 33 (E)), and the optical head base 11 is placed in subroutine L7. to the up position, and move disk D on carriage 2 to standby position.
3 (F)), the playback mode is instructed in step S91 (FIG. 33 (G)), the flowchart in the playback state (
The process advances to FIG. 21), and waits for the input of the operation switch and the detection of the end of playback of the final song.

When the playback of the last song is finished, the microcomputer 40 proceeds to steps 5235.5290 and instructs the stop mode (FIG. 33(H)), and steps 5291.5292.5.
Proceed to 293.

When n is 7, the microcomputer 40 returns YES in step 5295, moves the optical base 11 to the down position in subroutine L1 (Fig. 33 (1)), and moves the carriage 2 to the store position in subroutine L2 (Fig. 33 (J)). ), the stocker 14 is moved to position S in subroutine L8 (Fig. 33 (K)).
In subroutine L4, the carriage S is moved to the loading position (Fig. 33 (L)), and in subroutine L7, the optical base 11 is moved to the up position (Fig. 33 (M)).
). Then, since step 8296 becomes No,
The process advances to the flowchart for the stopped state (FIG. 9), and waits for input of the operation switch again.

Next, as shown in FIG. 34(A), the operation when a disk is placed on the carriage S at the eject position and the playback switch 43 is operated will be described. Note that no disks are placed on any of the carriages 1 to 6.

When the playback switch 43 is operated, the microcomputer 40
The flowchart in the eject state shown in FIG. 8(C) proceeds to step 5153 and subroutine LIO, and the tray 7 and carriage S are moved to the funnel position while decelerating the moving speed in section S2 (FIG. 6).
FIG. 34(B) Also, the microcomputer 40 performs step 5220.
．． 5221, memorize Do as 1, move the optical Radbase 11 to the amplifier position in subroutine L7,
The disc D on the carriage S is set to standby (FIG. 34 (C)), the playback mode is instructed in step 5222 (FIG. 34 (D)), the flowchart for the playback state (FIG. 21) is entered, and the operation switch is input. The system waits for detection of the end of playback of the final song.

When the reproduction of the last song is finished, the microcomputer 40 proceeds to steps 5235 and 5290 in the flowchart 1- in the reproduction state shown in FIG. 21(D), and instructs the stop mode (FIG. 34(E)).

Step 5291 becomes YES, the process proceeds to the flowchart for the stopped state (FIG. 9), and waits for the operation switch input again.

Next, as shown in FIG. 35(A), the operation when a disk is placed on the carriage 2 at the eject position and the playback switch 43 is operated will be described. Note that a carriage S and one disk are placed thereon.

When the playback switch 43 is operated, the microcomputer 40
The flowchart in the eject state shown in FIG. 8(C) proceeds to step 5153 and subroutine L10, and the tray 7 and carriage 2 are moved to the loading position while decelerating the moving speed in section S2 (FIG. 6).
Figure 35(B)).

Further, the microcomputer 40 proceeds to steps 5220 and 5221, stores D2 as 1, moves the optical rad base 11 to the up position in subroutine L7, and puts the disk D on the carriage 2 into standby (FIG. 35(C)). Step 5222 instructs the playback mode (FIG. 35(D)), and the flowcharts 1 to 2 in the playback state
The process advances to Figure 1), and waits for the operation switch to be input and the end of playback of the final song to be detected.

When the playback of the last song is finished, the microcomputer 40 proceeds to steps 5235, 5290 in the flowchart in the playback state shown in FIG. 529
Proceed to 2.5293.

When n is 7, the microcomputer 40 returns YES in step 5295, moves the optical head bed 11 to the down position in subroutine L1 (FIG. 35 (F)), and moves the carriage 2 to the store position in subroutine L2 (FIG. 35 (G)). ), the stocker 14 is moved to position S in subroutine L8 (Fig. 35 (T())
, in subroutine L4, move the carriage S to the loading position (
35(I)), and in subroutine L7, move the optical Radbase 11 to the up position and move the carriage S.
Put the upper disk D on standby (Fig. 35 (J)).

The program then proceeds to steps 8296 and 5297, instructs the playback mode (FIG. 35(K)), and again waits for the operation switch to be input and the end of playback of the final song to be detected.

When the reproduction of the last song is finished, the microcomputer 40 proceeds to steps 5235 and 5290 and instructs the stop mode (FIG. 35 (L)), and step 5291 becomes YES, and the flowchart 1- in the stop state (FIG. 9) ) and then
The system waits for the operation switch to be input again.

In the above operation example, when there is no disc on the carriage S, the carriage S is moved to the loading position in subroutine L4 (FIG. 36(A)), and subroutine L7
to the optical RAD base 1] to the up position (3rd
6(B)), the answer at step 8296 is NO, the flowchart in the stopped state (FIG. 9) proceeds, and the process waits again for the operation switch input.

Next, as shown in FIG. 37(A), the operation when the playback switch 43 is operated without a disk being placed on the carriage 2 at the eject position will be described.

Note that disks are placed on carriages S and 1.

When the playback switch 43 is operated, the microcomputer 40
The flowchart in the eject state shown in FIG. 8(C) proceeds to step 5153 and subroutine LIO, and the 1-ray 7 and carriage 2 are moved to the loading position while decelerating the moving speed in section S2 (FIG. 6). (FIG. 37(B) Also, the microcomputer 40 performs step 522
Proceed to 0.5223, memorize D2 as 0, and also 52
24, 5225, 5226, n is 1, 8226 is YES, subroutine L2 moves the carriage 2 to the store position (Fig. 37 (C)), subroutine L8 moves the stocker 14 to position 1 (Fig. 37 (D) )'), the carriage 1 is moved to the loading position in subroutine L4 (Fig. 37(E)).
), and in subroutine L7, the optical head base 11 is moved to the up position and the disk D on the carriage 1 is put on standby (FIG. 37 (F)), and the flowcharts 1 to 1 in the stopped state (FIG. 9) are proceeded to. The system waits for the operation switch input.

Next, the operation when the playback switch 43 is operated without a disc being placed on the carriage 1 at the eject position will be described. Note that no disks are placed on any of the remaining carriages.

When the playback switch 43 is operated, the microcomputer 40
The flowchart in the eject state shown in FIG. 8(C) proceeds to step 5153 and subroutine LIO, and the tray 7 and carriage 1 are moved to the loading position while decelerating the moving speed in section 82 (FIG. 6).
Figure 38(B)).

The microcomputer 40 proceeds to steps 5220 and 5223, and
Memorize l as 0, and also 5224, S225.822
6, n is 7, 8228 is YES, and subroutine L2 moves carriage 1 to the store position (Fig. 38 (C)
)), the stocker 14 is moved to position S in subroutine L8 (Fig. 38 (D)), the carriage S is moved to the loading position in subroutine L4 (Fig. 38 (E)'), and the optical head base 11 is moved in subroutine L7. Move it to the up position,
The process advances to the flowchart for the stopped state (FIG. 9), and waits for input of the operation switch again.

Next, as shown in FIG. 39(A), the carriage 3
The operation when the carriage S selection switch 45 is operated while the upper disk is on standby will be described. Note that a disk is placed on the remaining carriage S, 2.6.

When the carriage S selection switch 45 is operated, the microcomputer 40 executes the flowchart in the stopped state shown in FIG.
1 and move the optical Radbase 11 to the down position (3rd
9 (B)), subroutine L2 moves the carriage 3 to the store position (Fig. 39 (C)), and subroutine L8 moves the carriage 3 to the store position.
- Move the lug 14 to position S (Fig. 39 (D)), and move the carriage S to the loading position in subroutine L4 (Fig. 39 (E)).
), and in subroutine L7, the optical rad base 11 is moved to the up position, the disk D on the carriage S is put on standby (FIG. 39(F)), and the operation waits for the input of the operation switch.

Next, as shown in FIG. 40(A), the carriage S
The operation when the carriage 1-6 selection switch 46 is operated while the upper disk is on standby will be described. Note that a disk is placed on the remaining carriage 2.6.

When the carriage 1-6 selection switch 46 is operated, the microcomputer 40 executes steps 855, 5130, and 5131 in the flowchart in the stopped state shown in FIG.
．． Proceed to step 5132, n is 2 and step 5132 is YES
, move the optical base 11 to the down position in subroutine L1 (Fig. 40 (B)), move the carriage S to the store position in subroutine L2 (Fig. 40 (C)), and move the stocker 14 in subroutine = 81 Chin L8. At position 2 (Figure 40 (D))
, in subroutine L4, the carriage 2 is moved to the load position (fourth
Also, in subroutine L7, the optical disc base 11 is moved to the up position, and the disc D on the carriage 2 is placed on standby (FIG. 40 (F)).

When the carriage 1-6 selection switch 46 is operated again, the microcomputer 40 executes steps S5.5130.5135.
．． Proceed to 5136, n is 6 and step 5137 is YES
, the optical head base 11 is moved to the down position in subroutine L1 (Figure 40 (G)), the carriage 2 is moved to the store position in subroutine L2 (Figure 40 (H)), and the stocker 14 is moved to position 6 in subroutine L8. (Figure 40 (1)
), subroutine L4 moves the carriage 6 to the loading position (
In subroutine L7, the optical disc base 11 is moved to the up position, and the disk D on the carriage 6 is put on standby (FIG. 40(K)).

When the carriage 1-6 selection switch 46 is operated again, the microcomputer 40 executes steps S5.5130.5135.
．． Proceed to 5136, n is 2 and step 5137 is YES
Then, in subroutine L1, move the optical base 11 to the down position (Fig. 40 (L)), in subroutine L2, move the carriage 6 to the store position (Fig. 40 (M)), and in subroutine L8, move the slides 1 to 14. In position 2 (Fig. 40)
N)), in subroutine L4, the carriage 6 is moved to the loading position (FIG. 40 (○)), and in subroutine L7, the optical rad base 11 is moved to the up position, and the disk D on the carriage 2 is put on standby (Fig. 40). Figure (P))
.

Thereafter, in the same manner as above, the carriage 1-6 selection switch 4
6 is operated, the disks on the carriage 2.6 are alternately put on standby.

The typical operation examples of the device of the present invention have been described above, but operations other than the above-mentioned operation side are performed in the same manner as described above, and FIGS.
Flowchart in the stopped state shown in D), the first
The flowcharts in the eject state shown in FIGS. 8A to 8C and the flowcharts in the playback state shown in FIGS.

Note that the above flowchart is described to explain the principle operation, and changes can be made without departing from the spirit of the present invention. In particular, once the switches 41 to 46 for selecting the operation mode are operated, they cannot be operated again until the mechanism operation according to the flowchart is completed, but in the actual product, each switch 41 to Needless to say, it is programmed to allow reception even when the mechanism is operating. In particular, the carriage S selection switch 4
5. Since the carriage 1-6 selection switch 46 is often operated before the mechanism operation is completed, it is programmed to ensure that the mechanism operation based on the switch operation is performed even during operation.

For example, with the disc on the carriage 5 in standby, operating the carriage S selection switch 45,
Even if the carriage 1-6 selection switch 46 is operated twice immediately, the disk on the carriage 2 is programmed to be on standby.

Note that the device of the present invention is not limited to the above-mentioned embodiment and can take various forms. For example, in the above-mentioned embodiment, the tray 7 is moved between the eject position and the load position, and Although a single tray/carriage moving mechanism 22 is used as the mechanism for moving the carriage between the load position and the store position, it is also possible to configure the tray/carriage to be moved by separate mechanisms.

Furthermore, in the above embodiment, the disc on the carriage is clamped by moving the optical disc base to the up position, but conversely, the disc on the carriage is clamped by lowering the carriage and clamper. may be configured.

Further, although a total of seven carriages are used in the above-mentioned apparatus, it goes without saying that the number of carriages is not limited to this.

[Effects of the Invention] As explained above, according to the device of the present invention, there is a first carriage selection switch for selecting a predetermined carriage, and a first carriage selection switch for sequentially selecting a carriage other than the predetermined carriage in a loop. By having two carriage selection switches, even if you do not know the current carriage (without looking at the display), you can first operate the first carriage selection switch and then operate the second carriage selection switch. You can easily select the desired carriage. Of course, since only two carriage selection switches are required, the cost is low and it is suitable for simplifying the design of the front panel.

Further, according to the device of the present invention, when the first carriage selection switch is operated, a predetermined carriage is selected, and the subsequent playback operation is a single play operation in which only the disc on the carriage is played back. Therefore, as soon as the first carriage selection switch is operated, although it is a changer type playback device, it can be operated with the same feel as a conventional single player type playback device.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an outline of the mechanism of the apparatus of the present invention, FIG. 2 is an operation diagram showing the movement positions of the tray 7 and carriage S, and FIG. 3 is an operation diagram showing the movement position of the optical helad base 11. 4 is an operation diagram showing the moving positions of the slider 1 to the lever 14, FIG. 5 is a block diagram showing the operation control circuit in the device of the present invention, and FIG. 6 is a detection switch and detection for the moving position of the carriage. 7 is a timing chart showing the state of the detection switch and the detection signal with respect to the moving position of the optical heliometer 11, and FIG. 8 is a timing chart showing the state of the detection switch and the detection signal with respect to the moving position of the stocker 14. 9 to 21 are flowcharts, and FIG. 22 is a front signal F for the load position detection signal LOAD.
A timing chart showing changes in the states of RONT and rear signal REAR, and FIGS. 23 to 40 are diagrams illustrating the operation of the apparatus of the present invention, respectively. Explanation of symbols S, 1 to 6 Carriage, 7 Tray, 8 Disk mounting table, 9 Spindle motor, 10 Optical head, 11 Optical head base, 12 Magnetic clamper, 13.・・Disc sensor, 14・・
Stocker, 15-21... Slot, 22... Tray/carriage movement mechanism, 23... Tray motor, 24
...Front panel, 25...Eject position detection switch, 26...Load position detection sensor, 27.
- Store position detection switch, 28... Optical head base vertical mechanism, 29... Clamp motor, 30... Tray lock mechanism, 31... Up position detection switch,
32... Down position detection switch, 33... Lock release detection switch, 34... Stocker moving mechanism, 35...
...Stocker motor, 36...Stocker position detection sensor, 37...Reference position detection switch, 40...Microcomputer, 41...Stock switch, 42...Eject/load switch, 43...Regeneration switch, 44・
... Stop switch, 45... Carriage S selection switch, 46... Carriage 1-6 selection switch, 47.
- Tray motor drive circuit, 48... Clamp motor drive circuit, 49... Stocker motor drive circuit, - Disk, R1-R14... Resistor.

Claims (1)

[Scope of Claims] n number of carriages, each of which is provided with a disk mounting portion on which a disk can be placed; a tray provided with a single slot into which the carriage can be inserted and removed; and any one of the carriages. tray moving means for moving a tray into which two carriages are inserted between an eject position where it projects outside the apparatus and a load position where it is housed within the apparatus;
a stocker having n slots, and stocker moving means for moving the stocker to n positions where each slot of the stocker is at the same height as a slot of the tray brought to the loading position; a carriage moving means for moving the carriage between the tray brought to the loading position and the stocker brought to any of the n positions; a disc reproducing means for reproducing a disc on a carriage inserted into the carriage; and a disc reproducing means for reproducing a disc on a carriage inserted in the carriage; a moving means for mounting a disc on the disc reproducing means; a first carriage selection switch for selecting one predetermined carriage from among the n carriages; and a plurality of carriages other than the predetermined carriage. a changer-type disc playback device comprising: a second selection switch that sequentially selects one of the carriage selection switches in a loop; and a control means that controls each of the moving means based on the operation of the first and second carriage selection switches. The device selects a predetermined one of the n carriages by operating the first carriage selection switch, and in the subsequent playback operation, the device selects a predetermined one of the n carriages by operating the first carriage selection switch. This is a single play operation in which only the disc is played back, and a desired carriage other than the predetermined carriage is selected by operating the second carriage selection switch a required number of times, and the subsequent playback operation is A changer-type disc playback device characterized in that it is configured to perform a changer play operation in which the disc on the carriage and the discs on the carriages after the carriage are sequentially played.