KR100239301B1 - Tray revolution controller of optical disk changer system - Google Patents

Abstract

The present invention searches for the ID code of each of the dishes by the ID code of each of the dishes and the start / end code generated when the tray roulette having a plurality of dishes is rotated, and the ID code of each of the discovered dishes is referred to. In the tray rotation control apparatus of the optical disk changer system that controls the rotation of the tray roulette, the processor performs all the tasks such as detecting the number of ID pulses and the width of the ID pulses and the start / end pulses. In order to solve the problem that the rotation of the tray roulette cannot be accurately controlled by the error of the rotational speed caused by the minute physical change such as the tightening state of the rotating plate and the difference in the amount of lubricant, the ID code of the dish is used. A low pass filter for integrating the start / end code; A rotation error adjusting unit for compensating for a rotation error generated when the tray roulette is rotated using the integral value of the low pass filter; A comparator comprising a plurality of comparators for comparing the output of the low pass filter with a preset reference voltage compensated for by the rotation error in the rotation error adjusting unit; A latch configured to latch and output an output of each of the comparators of the comparator; A microcomputer for identifying the ID code and the start / end code of the dish according to the output of the latch and generating a drive control signal for rotating and stopping the tray roulette: rotating the tray roulette by the drive control signal of the microcomputer Or by providing a tray rotation control apparatus of the optical disk changer system, characterized in that it comprises a drive unit for stopping, there is an effect that can be more accurately control the rotation of the optical disk changer system with a smaller capacity processor.

Description

TRAY REVOLUTION CONTROLLER OF OPTICAL DISK CHANGER SYSTEM}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc changer system, and more particularly, to an apparatus for controlling rotation of a tray of an optical disc changer configured to hardwarely compensate for a rotation error generated during tray rotation.

Conventional optical disc reproducing apparatus, that is, optical disc players, include a compact disc player (CDP: Compact Disc Player), a laser disc player (LDP: Laser Disc Player), and a compact disc graphic player (CDGP). In general, a compact disc player is a device capable of playing only voice, and a laser disc player and a compact disc graphic player are devices capable of simultaneously playing video and audio.

Recently, a video compact disc player capable of playing video and audio on a disc having the same size as a general compact disc has been developed and used.

On the other hand, such optical disc playback devices reproduce images and / or audio recorded on an optical disc and output them through a screen and / or a speaker, and have a higher signal-to-noise ratio than conventional video and / or audio playback devices, resulting in better image quality and / or Or it can reproduce the signal with sound quality, there is no noise caused by irregular playback and advocacy, very little distortion, no ghost, random access, etc. There is a trend that is widely spread Is in.

As the performance and function of the optical disc player develops, the types of data recorded on the optical disc are also diversified. In the case of a large amount of data such as a movie, the data corresponding to one movie cannot be recorded on one disc. In addition, the inconvenience caused by having to replace or replace the disk once every use occurred.

Therefore, an optical disc changer system has been developed to improve these problems. The optical disc changer system is a device that can play a plurality of discs in one tray and sequentially play them, and also select and play a desired disc as needed. .

As described above, in the optical disc changer system, a tray is configured to mount a plurality of discs, and the tray includes a tray roulette on which a plurality of discs are mounted and rotatable.

1 shows a disc tray structure diagram in an optical disc changer system in which three discs can be mounted simultaneously.

As shown in FIG. 1, the disc tray includes a tray roulette, and the tray roulette is provided with dishes 110, 120, and 130 for mounting a disc.

Each dish 110, 120, 130 of the tray roulette is provided with an ID code (IDentification code) for distinguishing the dish (110, 120, 130). For example, in FIG. 1, three dishes 110, 120, and 130 are provided with ID1, ID2, and ID3, respectively. This is to easily search for the desired disk with the disks mounted on the dishes 110, 120, 130.

A typical disk ID search is performed by a sensor 140, and the sensor 140 for ID search is located at an angle to the left from the disk chucking position Y as shown in FIG. . When the disc IDs are determined by the sensor 140, the tray roulette is rotated so that the disc desired by the user is reproduced to move the disc on which the disc is mounted to the disc chucking position (Y).

2 shows conventional hardware for performing such ID search and position control of tray roulette.

In FIG. 2, the tray roulette 210 is rotated by the driving of the driving unit 230, and the driving unit 230 is controlled by the control unit 220.

In addition, the ID detection sensor 140 generates and outputs a pulse for determining each dish as the tray roulette 210 rotates. That is, as shown in FIG. 3, when the first dish 110 is opposed to the ID detection sensor 140 while the tray roulette 210 rotates, one low pulse A is generated and the second dish 120 is performed. Is opposite to the ID detection sensor 140, two low pulses (B) is generated, when the third dish 130 is opposed to the ID detection sensor 140, three low pulses (C) are generated. Accordingly, the controller 220 may determine the ID of the corresponding dish by counting the number of low pulses provided from the ID detection sensor 140.

In this case, four low pulses are shown between the pulses representing the ID codes of the dishes in FIG. 3, which are used to control the rotation and stop operation of the tray roulette, which is called a start / end code. do. Normally, the right two low pulses are called start codes and the left two low pulses are called end codes among the four low pulses.This is done by rotating the tray roulette clockwise to detect the start code first, and then starting code is detected. This is because the number of low pulses detected afterwards is counted and recognized as an ID. When the end code is detected after the ID code is detected, the rotation of the tray roulette is stopped. The dish corresponding to the detected ID then stops at the disc chucking position exactly. For example, after the start code is detected, the controller rotates clockwise to detect two low pulses, and recognizes it as ID 2, and stops rotating the tray roulette when the end code is detected after detecting the ID pulse 2 times. Then, the ID 120 of the ID 2 stops exactly at the disc chucking position. At this time, the low pulse width of the start / end code and the low pulse width of the ID code are configured differently. That is, when the tray roulette 210 rotates at a constant speed, the low state time of the ID code is 20 msec, and the low state time of the start / end code is 60 msec. In addition, between the ID code and the start / end code, or between the start / end code and the ID code is maintained at a high state of 350msec. Therefore, by checking the width of the pulse, it is possible to know whether the detected pulse is a start / end code or an ID code.

Meanwhile, in searching for the ID of the dish by rotating the tray roulette as described above, the rotation speed control of the tray roulette is normally performed by a driving pulse signal (see FIG. 4) provided by the controller 220 to the driver 230. .

That is, the controller 220 provides the driving unit 230 with the forward pulse F in the high state to rotate the tray roulette clockwise to detect the ID code, and the start point of the end code by the continuous rotation of the tray roulette. When the falling edge of the first low pulse is reached, the braking PWM signal G having a certain duty ratio is provided to the driver 230 to reduce the rotation speed of the tray roulette. Then, when the rising edge of the second low pulse, which is the end point of the end code, is reached, the controller 220 provides the driving unit 230 with a reverse one shot pulse H to stop the rotation of the tray roulette. .

Meanwhile, in searching the IDs of the dishes 110, 120, and 130 and controlling the position of the tray roulette, the controller 220 detects the number of ID pulses and the widths of the ID pulses and the start / end pulses. There was a problem that a large amount of work was required to use a large capacity processor.

In addition, in controlling the position of the tray roulette, there is a problem in that the ID of each dish is misjudged due to an error in the rotational speed caused by a minute physical change such as a tightening state of the rotating plate and a difference in the amount of lubricant.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and in order to accurately detect the ID of each dish, the tray rotation control apparatus of the optical disk changer configured to compensate hardware for rotation errors caused by physical factors during rotation of the tray roulette. To provide.

In the present invention, in order to achieve the above object, the ID code of each of the dishes by searching the ID code of each of the dishes and the pulse signal indicating the start / end code generated when the tray roulette provided with a plurality of dishes, A tray rotation control apparatus of an optical disk changer system for controlling the rotation of the tray roulette with reference to the ID code of each found dish; A low pass filter for integrating a pulse signal representing an ID code and a start / end code of the dish; A rotation error adjusting unit for compensating for a rotation error generated when the tray roulette is rotated using the integral value of the low pass filter;

A comparator comprising a plurality of comparators for comparing the output of the low pass filter with a preset reference voltage compensated for by the rotation error in the rotation error adjusting unit; A latch configured to latch and output an output of each of the comparators of the comparator; A micom that identifies an ID code and a start / end code of the dish according to the output of the latch values L4-L0, and generates a drive control signal for rotating and stopping the tray roulette: a drive control signal of the micom It provides a tray rotation control apparatus of the optical disk changer system comprising a drive unit for rotating or stopping the tray roulette by.

1 is a disc tray structure diagram of an optical disc changer system in which three discs can be mounted simultaneously;

2 is a block diagram of hardware for performing ID search and tray rotation control of an optical disc changer system;

FIG. 3 is a pulse waveform diagram showing an ID pulse and a start / end pulse generated to determine each dish during tray rotation of an optical disc changer system. FIG.

4 is a drive signal waveform diagram for rotating a tray of an optical disc changer system;

5 is a block diagram showing a tray rotation control apparatus of the optical disk changer system according to an embodiment of the present invention;

Fig. 6 is a pulse waveform diagram showing an ID pulse and a start / end pulse when a tray error occurs.

<Description of the code | symbol about the principal part of drawing>

100: first low pass filter 200: second low pass filter

300: rotation error detection unit 400: rotation error compensation unit

500: comparison unit 600: latch

700: microcomputer 800: drive unit

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

FIG. 5 is a block diagram of a tray rotation control apparatus of the optical disk changer system according to the present invention, and integrates an ID pulse and a start / end pulse detected from a conventional sensor 140 and outputs an integrated value thereof. (100), the second low pass filter 200 for integrating the integral value input from the first low pass filter 100 once more, and outputting the integrated average voltage to the inverting terminal of the rotation error detector 300, The rotation error detector 300 generating a rotation error signal by comparing the average voltage input from the second low pass filter 200 to a preset reference voltage, and varying a power supply voltage supplied to one input terminal according to the rotation error signal. In addition, the rotation error compensator 400, which provides the variable power supply voltage as a reference voltage to the non-inverting terminal of the comparator 500, the average voltage and the rotation error compensator 400 input from the first low pass filter 100. Offered by) The comparison unit 500 compares the reference voltage and provides the comparison result as a logic signal to the latch 600, a latch 600 which latches and outputs a logic signal provided from the comparison unit 500, and an output of the latch. Accordingly, the microcomputer 700 that identifies the ID pulse and the start / end pulse of each dish and generates a drive control signal for controlling the rotation of the driver 800, and the driver 800 driven by the control of the microcomputer 700. It consists of

Referring to the operation process of the tray rotation control apparatus of the optical disk changer according to the preferred embodiment of the present invention made of the above-described member is as follows.

First, the ID pulses and start / end pulses detected from the conventional sensor 140 are applied to the first low pass filter 100 as shown.

The first low pass filter 100 integrates the ID pulse and the start / end pulse applied from the conventional sensor 220, and integrates the first integrated signal S1 thus integrated into the second low pass filter 200. And an inverting terminal (-) of each of the plurality of comparators 510 to 550 included in the comparator 500. At this time, the first integrated signal S1 obtained by firstly integrating the ID pulse and the start / end pulses in the first low pass filter 100 has a waveform as shown by solid lines in FIGS. 6A to 6C.

The second low pass filter 200 integrates the integration signal S1 provided from the first low pass filter 100 again, and rotates the second integration signal S2 in which the first integration signal S1 is integrated. The non-inverting terminal (+) of the error detector 300 is applied. At this time, the second integrated signal S2 has a waveform as shown by the thick solid line in FIGS. 6A to 6C, and the voltage level will be the average voltage of the voltage levels of the ID pulse and the start / end pulse. It will also coincide with the average voltage level of the first integrated signal S1 indicated by solid lines in 6a to 6c.

The rotation error detector 300 amplifies the voltage difference between the voltage of the second integrated signal S2 and the reference voltage Vr input through two input terminals, and converts the amplified difference voltage into the rotation error compensator 400. To the () side. At this time, the differential voltage output from the rotation error detection unit 300 is a voltage corresponding to the rotation error generated during the rotation of the tray roulette, the reference voltage (Vr) is a voltage set by a number of experiments, the tray rotation is accurately controlled Is the voltage level of the second integrated signal S 2.

The rotation error compensator 400 is supplied with a power supply voltage Vcc at one input terminal thereof, and a differential voltage output from the rotation error detector 300 is applied to the type force stage, and a plurality of series connected in series between the two input terminals. Comprising resistors R1 to R6, the divider voltages applied between the resistors (that is, the voltages indicated by V1 to V5 in FIG. 5) are provided to the non-inverting terminals + of the comparators 510-550, respectively.

Here, the rotation error compensator 400 divides the power supply voltage supplied to the one input terminal by each of the resistors R1-R6, and applies the divided voltages to the non-inverting terminals of the comparators 510-550. do. At this time, the voltage applied to the non-inverting terminal of the comparators 510-550 is a reference voltage of each of the comparators 510-550, and this voltage is varied as follows by the error voltage provided by the rotation error detector 300. do.

First, as shown in FIG. 6A, when the tray roulette operates normally and no error occurs, the average voltage output from the second low pass filter 200 and the preset reference voltage become equal.

Therefore, the error voltage detected by the rotation error detector 300 becomes zero, and the rotation error detector 300 serves as a ground with respect to the reference voltages of the comparators 510-550.

In this case, the reference voltages V1-V5 applied to the inverting terminals of the plurality of comparators 510-550 constituting the comparator 500 are an error signal output from the power supply voltage Vcc and the rotation error detector 300. (Ie, voltage) is a voltage divided by each resistor R1-R6, the value of which is set stepwise between the maximum value and the lowest value of the following rotation error control range, respectively.

Next, as shown in FIG. 6B, when the tray roulette rotates slightly slower than the control, the average voltage Va output from the second low pass filter 200 becomes smaller than the preset reference voltage Vr. In addition, the error voltage detected by the rotation error detector 300 will have a negative value.

Therefore, since the rotation error detector 300 acts as a negative bias with respect to the reference voltages of the comparators 510-550, the reference voltage V1 applied to the inverting terminals of the comparators 510-550. In each of -V5, the error signal (ie, voltage) output from the error detector 300 will be reduced by the amount (voltage level) of voltage division by each resistor R1 -R6.

Therefore, the reference voltage applied to the inverting terminals of the comparators 510-550 decreases as a whole, so that the average voltage output from the second low pass filter 200 and the preset reference voltage Vr coincide with each other. By accurately controlling the rotation of the tray roulette can be placed in the correct position.

Finally, as shown in FIG. 6C, when the tray roulette rotates slightly faster than the control, the voltage level of the second integrated signal output from the second low pass filter 200 is greater than the preset reference voltage Vr. As it becomes large, the error voltage detected by the rotation error detector 300 will have a positive value.

Therefore, the rotation error detector 300 at this time acts as a positive (+) bias with respect to the reference voltages of the comparators 510-550, and thus the reference voltage V1 applied to the inverting terminals of the comparators 510-550. In each of -V5, the error signal (ie, voltage) output from the error detector 300 will be increased by the amount (voltage level) divided by the voltages of the resistors R1-R6.

Therefore, the reference voltage applied to the inverting terminals of the comparators 510-550 increases as a whole, so that the voltage level of the second integrated signal output from the second low pass filter 200 (that is, detection detected from a conventional sensor). The average voltage of the signal) and the predetermined reference voltage (Vr) coincide with each other to precisely control the rotation of the tray roulette, thereby positioning the tray roulette in the correct position.

As described above, since the reference voltages V1-V5 of which the rotation error is compensated are respectively applied to the non-inverting terminals (+) of the comparators 510-550, the comparators 510-550 may use the first low pass filter 100. ) And the reference value (V1-V5) are respectively compared and the comparison value is applied to the latch 600 as a logic signal.

At this time, the latch 600 applies the outputs of the comparators 510-550 to the microcomputer 700 through the terminals L4-L0, and the microcomputer 700 according to the outputs L4-L0 of the latch 600. It is configured to perform the following operation.

That is, when the output of the terminal termination resistor is 1,0,0,0,0, the microcomputer 700 starts a mode for detecting the ID of the dish. When the output of the latch 600 changes, Subtract the latch value before the change (L (t-1)) from the latch value of L (t) (L (t)-(L (t-1)) to subtract the sign (+ or-) of the subtracted result. To judge.

The microcomputer 700 stores the code in the internal ID buffer, but if the code continues for a predetermined number of times (for example, three or five times) in the (+) or (-) state, the microcomputer 700 invalidates the ID recognition of the dish and the ID. Clear the buffer. At this time, the continuous (+) or (-) sign for a predetermined number of times indicates that the rotation error is maintained for a predetermined time or more, and that the rotation error is not controlled (that is, correction of the rotation error).

The microcomputer 700 has a latch value L4-L0 stored in the above-described ID buffer as (1,0,0,0,1) or (1,0,0,1,0) or (1,0,1, One of 1, 1) and the latch value L4-L0 is 0, 0, 0, 0, 0, and the latch is continued for a predetermined time (40 msec in this embodiment as described later). The value is recognized as the ID value of the dish and the ID recognition process is terminated. In other words, if the rotation error is present (at least one is included) and the rotation error is not present (all 0s), it is determined that the ID is correctly detected.

When the ID of the dish is recognized and the latch values L4-L0 are 1,0,0,0,0, as described above, the braking PWM signal G is provided to the driver 800 to rotate the tray roulette. Reduce Then, when the latch value is 1, 1, 1, 1, 1, the microcomputer 700 provides a reverse one shot pulse to the driver 800 to stop the rotation of the tray roulette.

Although the present embodiment has been described in the case where three dishes are configured in the roulette, one of ordinary skill in the art can easily implement the present invention by varying the number of dishes.

According to the present invention as described above, by hardly recognizing the ID pulse of each dish, and by hardware compensation for the rotation error caused by the physical change during the rotation of the tray roulette, the amount of work of the microcomputer can be reduced, The rotation of the tray roulette can be controlled more accurately.

Claims (4)

The ID code of each of the dishes is searched by a pulse signal representing the ID code and the start / end code of each of the dishes generated when the tray roulette having a plurality of dishes is rotated, and the ID codes of the discovered dishes are referred to. A tray rotation control apparatus of an optical disc changer system for controlling rotation of the tray roulette; A low pass filter for integrating a pulse signal representing an ID code and a start / end code of the dish; A rotation error adjusting unit for compensating for a rotation error generated when the tray roulette is rotated using the integral value of the low pass filter; A comparator comprising a plurality of comparators for comparing the output of the low pass filter with a preset reference voltage compensated for by the rotation error in the rotation error adjusting unit; A latch configured to latch and output an output of each of the comparators of the comparator; A microcomputer for identifying an ID code and a start / end code of the dish according to the output of the latch values L4-L0, and generating a drive control signal to rotate and stop the tray roulette: And a drive unit for rotating or stopping the tray roulette by the drive control signal of the microcomputer. The method of claim 1; The rotation error adjusting unit; A second value for integrating the integral value of the pulse signal representing the ID code and the start / end code outputted from the low pass filter once more and outputting the average voltage of the pulse signal representing the ID code and the start / end code of the dish; A low pass filter; A rotation error detector for comparing a mean voltage output from the second low pass filter with a preset reference voltage and generating a rotation error signal corresponding to a rotation error generated when the tray roulette rotates; And a rotation error compensator for varying the reference voltage of the comparator to correspond to the rotation error signal generated by the rotation error detection unit. The method of claim 2; The rotation error detection unit, the tray rotation control apparatus of the optical disk changer system, characterized in that the differential amplifier for amplifying and outputting the difference value of the two input voltages. The method of claim 2 or 3; The rotation error compensator has a power supply voltage supplied to one input terminal thereof, and an output terminal of the rotation error detection unit connected to the other input terminal thereof, and includes a plurality of resistors connected in parallel between the two input terminals to supply voltages to the respective resistors. Is provided as a reference voltage to each of the inverting terminals of the plurality of comparators constituting the comparison unit, the tray rotation control apparatus of the optical disk changer.

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