JPH10112106A - Open/close controller for tray in disk changer system and its method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent vibration of a tray and focus drop of a disk by controlling a motor so that it gradually increases its driving speed in opening/closing the tray and gradually decrease the speed at the time of finishing the drive. SOLUTION: A control part 130 decreases a driving force of a motor 110 at a starting point to open/close a tray 100 by a moving part 120, and gradually increases the driving force as the tray 100 moves. When the movement of the tray 100 has reached a fixed speed, the motor 110 keeps its driving force at a steady state for the tray 100 to move at a constant speed and reach near a target, halt point. Then, the control part 130 controls the motor 110 to gradually decrease the moving speed of the tray 100 and supplies the motor 110 with a counter-electromotive force before the tray reaches the target halt point. Thus, it is possible to halt the tray 100 at an accurate target point and prevent the tray from vibrating and also prevent the disk from dropping a focus.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for controlling the opening / closing of a tray in a disc changer system. The present invention relates to a controller and a method for opening / closing a tray without vibration.

[0002]

2. Description of the Related Art As a normal disc reproducing apparatus, a compact disc player (CDP; Compact Disc Pla
yer), laser disk player (LDP; Laser Dis
c Player), and various disc players (Disc Player) such as a compact disc graphic player (CDGP)
There is. Compact disc players are mainly used for audio playback, and laser disc players and compact disc graphic players are mainly used for simultaneous video and audio playback. Recently, a video compact disc player (VV) capable of reproducing audio and video on a disc having the same size as a general compact disc has been developed.
CDP (Video Compact Disc Player) has also been developed and used. These disc players can reproduce video and / or audio recorded on the disc without noise or distortion, and have advantages such as no ghost and random access.

[0003] As the performance and functions of disk players have evolved, the data recorded on the disks has also become diverse. When the amount of data is enormous, such as in a movie, it may not be possible to store all the data corresponding to one movie on one disc. In this case, the disc must be replaced during the movie. There was an inconvenience that it had to be done. In order to improve such inconvenience, a disc changer system (Disc Changer Sys
tem) was developed. The disc changer system is a device that can play back a plurality of discs in one tray and then play the discs one by one or select and play a desired disc as needed. Accordingly, the disc changer system includes a tray for mounting a large number of disks, and a turntable for rotating the large number of disks mounted on the tray.

FIG. 1 is a perspective view of a tray in a disk changer system, showing a tray on which three disks can be mounted. The tray 10 is provided with a rotating roulette 20, and the roulette 20 is provided with three disk mounting portions 30, 40, and 50. The disks mounted on the disk mounting units 30, 40, 50 are chucked and rotated by a turntable (not shown). Recently, the tray 10 has been opened so that one of the discs mounted on the tray 10 can be replaced while another one is being driven for reproduction or recording. A gain disc changer system was developed. While one disc is being driven for recording or reproduction, the disc is not in contact with the roulette 20, so even if the tray 10 is opened during recording and reproduction of the disc, recording and reproduction of the disc will be performed. It has no effect on the operation of.

[0005] However, in such a conventional disk changer system, the tray 1 is driven while one disk is being driven.
When the tray 10 is opened or the tray 10 in the open state is closed, vibration occurs due to the movement of the tray 10 and a focus drop (focus) occurs on the disk being driven.
drop) occurs.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems.
An object of the present invention is to provide a tray open / close control device capable of reducing the vibration of the tray when the tray is opened / closed while the disk is being driven and preventing a focus drop.

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided a disk changer system for selectively driving a large number of disks, wherein the tray is moved in an open / close control apparatus for a tray containing the disks. A moving unit for performing opening / closing; a motor for driving the moving unit; and opening / closing of the tray.
A control unit for controlling the motor so as to gradually increase the drive speed of the motor at the start of closing and gradually decrease the drive speed of the motor at the completion of opening / closing of the tray. This is achieved by a tray open / close controller.

Here, the control unit drives the motor such that the tray receives a force in a direction opposite to the moving direction before the tray reaches the target stop point. In this way, the tray will stop exactly at the target stopping point.

Further, the motor is driven by a PWM signal, and the control unit adjusts the driving speed of the motor by changing the duty ratio of the PWM signal.

Further, according to the present invention, there is provided a tray open / close control method capable of preventing the vibration of the tray by gradually changing the moving speed of the tray as described above.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 2 is a block diagram of a tray control device according to the present invention. The tray control device according to the present invention is a tray 1
Moving unit 12 for opening / closing by moving 00
0, a motor 110 for driving the moving unit 120, and a control unit 130 for controlling the moving speed of the tray 100 by controlling the motor 110. The tray 100 is the same as the conventional tray shown in FIG. The moving unit 120 can be configured by a rack installed on the tray 100 and a pinion installed on the rotation shaft of the motor 110. In the above configuration, when the motor 110 rotates, the tray 100 moves by the combined body of the rack and the pinion. At this time, the control unit 130 controls the power supply to the motor 110 to control the movement of the tray 100.

To open / close the tray 100, the controller 130 supplies power to the motor 110 to move the tray 100. At this time, the vibration of the tray 100 occurs most when the tray 100 starts moving from the stopped state and when the tray 100 changes from the moving state to the stopped state. Accordingly, the controller 130 controls the speed of the tray 100 to gradually change in order to reduce the vibration generated at that time.

That is, the controller 130 reduces the driving force of the motor 110 when the tray 100 starts to open / close, and gradually increases the driving force of the motor 110 as the tray 100 moves. As a result, the speed of the tray 100 gradually increases at the start of the opening / closing of the tray 100. When the moving speed of the tray 100 reaches a predetermined speed, the driving force of the motor 110 maintains a steady state, and the tray 100 moves at a constant speed.

When the tray 100 reaches near the target stop point, the control unit 130 controls the motor 110 so that the moving speed of the tray 100 gradually decreases. At this time, if the power supply to the motor 110 is cut off when the movement of the tray 100 is completed, the motor 110 continues to rotate due to inertia, and the tray 100 comes past the target stop point. In order to prevent this, the control unit 130 controls the tray 10
Before 0 reaches the target stop point, it supplies a back electromotive force to the motor 110. As a result, the tray 100 receives a force from the direction opposite to the moving direction, and stops at the correct target stop point. At this time, by gradually increasing the magnitude of the force applied in the opposite direction, it is possible to prevent vibrations generated in the tray 100 when suddenly applying a force in the opposite direction. It can be stopped accurately.

The control unit 130 controls the motor 1 based on the PWM signal.
Supply power to 10. As described above, in order to control the moving speed of the tray 100 to change gradually, the control unit 130 generates a PWM signal as shown in FIG.
The PWM signal includes a positive electromotive force section A and a counter electromotive force section B. The motor 110 is driven in the direction of moving the tray 100 in the forward electromotive force section A, and is driven in the direction opposite to the moving direction of the tray 100 in the back electromotive force section B.

In the positive electromotive force section A, the duty ratio of the PWM signal gradually increases. That is, the duty ratio of the PWM signal during the 100 msec from the time when the tray 100 starts to move is 20%, and the duty ratio of the PWM signal during the next 100 msec is 30%. Thereafter, the duty ratio increases to 50% and 70% every 100 msec, and becomes 100% after 400 msec. In the section where the duty ratio is increased, the power supplied to the motor 110 is gradually increased, so that the moving speed of the tray 100 is gradually increased. In the section where the duty ratio is 100%, the tray 100 moves at a constant speed. When the movement of the tray 100 continues for 2 to 3 seconds, the tray 100 reaches near the target stop point, and the control unit 130 generates a back electromotive force to stop the tray 100. At this time, the duty ratio of the back electromotive force is 100
Increase every msec. In this case, the force applied to the tray 100 from the opposite direction gradually increases, and the tray 100 arrives at the target stop point accurately without vibration.

[0018]

As described above, according to the present invention,
When opening / closing tray 100, tray 1
00 is gradually increased, so that the tray 100
Vibration when moving is not generated. Therefore, tray 10
The focus drop of the disk being driven among the disks mounted in the disk 0 is prevented. In addition, tray 10
Also when stopping 0, the tray 100 can be accurately arrived at the target stop point without vibration by applying a gradually increasing force from the opposite direction to the tray 100.

Although the present invention has been described in detail with reference to preferred embodiments, the present invention is not limited to these embodiments, and can be modified and improved without departing from the scope of the present invention. Of course.

[Brief description of the drawings]

FIG. 1 is a perspective view of a tray in a disc changer system.

FIG. 2 is a block diagram of a tray control device according to the present invention.

FIG. 3 is a graph showing a change in duty ratio according to time of a PWM signal supplied to a motor.

[Explanation of symbols]

 100 tray 110 motor 120 moving unit 130 control unit

Claims (6)

[Claims] An opening / closing control device for a tray accommodating said disks in a disk changer system for selectively driving a number of disks; a moving unit for moving said tray to open / close; A motor for driving a moving unit; and gradually increasing the driving speed of the motor at the start of opening / closing the tray, and gradually decreasing the driving speed of the motor at the completion of opening / closing the tray. A tray open / close control device, comprising: a control unit for controlling the motor. 2. The tray according to claim 1, wherein the control unit drives the motor so as to receive a force in a direction opposite to a moving direction before the tray reaches a target stop point. Open / close control device. 3. The tray according to claim 1, wherein the motor is driven by a PWM signal, and the controller adjusts a driving speed of the motor by changing a duty ratio of the PWM signal. Close control device. 4. A method for controlling the opening / closing of a tray accommodating a plurality of disks in a disk changer system for selectively driving a plurality of disks, wherein the moving speed of the tray is gradually increased when the opening / closing of the tray is started. When the moving speed of the tray reaches a predetermined speed, moving the tray while maintaining the predetermined speed; gradually moving the tray as the tray approaches a target stop point Controlling the tray to be open / closed, the method comprising: stopping the tray at a target stop point; 5. The method according to claim 4, wherein the step of reducing the moving speed includes the step of applying a force from a direction opposite to a moving direction of the tray. 6. The tray open / close control method according to claim 5, wherein the magnitude of the force applied in the opposite direction gradually increases.