KR100236109B1 - Apparatus for detecting a failure of the tray rotation of a disk change system - Google Patents

Abstract

The present invention relates to an apparatus for detecting a rotation failure of an optical disc changer system, which detects whether the rotation speed of the tray roulette is out of the rotation control range by using an ID code of each dish and a pulse signal indicating a start / end code. A first low pass filter for integrating a pulse signal representing the / end code and outputting a first integrated signal; A second low pass filter for integrating the first integrated signal once more to output a second integrated signal; An error detector for differentially amplifying the second integrated signal and a predetermined reference speed and outputting an error signal; Comprising an error comparison unit for comparing the error signal and the error tolerance range and outputs the result of the comparison, by detecting hardware failure in the rotational speed of the tray roulette outside the control range, by reducing the amount of work of the processor, the life of the processor The cost savings can be achieved by prolonging the performance of the processor and by not requiring a high performance processor.

Description

Tray rotation failure detection device of optical disc changer system {APPARATUS FOR DETECTING A FAILURE OF THE TRAY ROTATION OF A DISK CHANGE SYSTEM}

The present invention relates to an optical disc changer system, and more particularly, to an apparatus for detecting a rotational disorder in which tray rotation is out of control.

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 210, and the tray roulette 210 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 210 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. Therefore, 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, for example, 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. Also, between the ID code and the start / end code, or between the start / end code and the ID code is 350 msec. 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, 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. .

On the other hand, in the actual tray ruleset, rotational errors caused by physical factors such as the tightening state of the rotating plate and the difference in the amount of lubricant are generated. If such rotational errors are severe, the tray roulette is not correctly controlled and malfunctions. There was this.

Therefore, in the event that a rotation failure with a large rotation error occurs such that rotation control is not performed, in order to operate the tray roulette normally, the rotation failure of the tray roulette is detected, the error range is reset, or the physical factor is eliminated. Or compensation, which has conventionally been done in a processor.

However, the processor detects the ID of each of the dishes 110, 120, and 130, and detects the number of ID pulses and the widths of ID pulses and start / end pulses in controlling the position of the tray roulette, and other systems. A large number of control tasks are performed throughout, requiring a high performance processor.

As such, when a large number of tasks are concentrated on the processor, not only the life of the processor is shortened due to the execution of the concentrated tasks, but also when the high performance processor is used, the production cost increases.

Therefore, if the above-described tray rotation failure is detected, but implemented in hardware, by reducing the amount of work of the processor, it is possible to reduce the problems caused by the concentration of a number of tasks in the processor.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides an apparatus for detecting a tray rotation failure of an optical disc changer, which is configured to hardwarely detect a rotation failure such that the rotation error of the tray roulette is outside the control range. There is an object of the invention.

In the present invention, in order to achieve the above object, the rotation failure detection device of the optical disk changer system for detecting whether the rotation speed of the tray roulette is out of the rotation control range by using the pulse signal indicating the ID code and start / end code of each dish. A first low pass filter for integrating a pulse signal representing an ID code and a start / end code of the dish and outputting a first integrated signal; A second low pass filter for integrating the first integrated signal once more to output a second integrated signal; An error detector for differentially amplifying the second integrated signal and a predetermined reference speed and outputting an error signal; The present invention provides a rotation failure detection apparatus of an optical disc system including an error comparison unit configured to compare the error signal with an error tolerance and output the comparison result.

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 failure detection device of the optical disk changer system according to a preferred embodiment of the present invention;

FIG. 6 is a pulse waveform diagram showing an output waveform of each component member shown in FIG. 5; FIG.

<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: error comparison unit

410: highest limit comparator 420: lowest limit comparator

430: OR gate 500: microcomputer

Hereinafter, with reference to the accompanying Figures 5 and 6 will be described in detail a preferred embodiment of the present invention.

FIG. 5 is a block diagram showing a tray rotation failure detection device of an optical disk changer system according to an embodiment of the present invention, and FIG. 6 is a pulse waveform diagram showing an output waveform of each component shown in FIG.

Referring to FIG. 5, an apparatus for detecting a rotation failure of a tray of an optical disc changer system according to an exemplary embodiment of the present invention may include a first low pass filter 100, a second low pass filter 200, a rotation error detector 300, and an error. Comparing unit 400, the individual configuration and function are as follows.

The first low pass filter 100 firstly integrates an ID pulse and a start / end pulse signal detected from a conventional sensor (not shown), and then applies the first integrated signal to the second low pass filter 200. To provide.

The second low pass filter 200 integrates the signal received from the first low pass filter 100 once more, and provides the integrated signal to one input terminal of the rotation error detector 300.

The rotation error detection unit 300 generates an error signal by differentiating the output signal of the second low pass filter 200 from the reference value Vr, and converts the generated error signal into the highest limit comparator in the error comparison unit 400 ( 410 and the lowest threshold comparator 420, respectively.

The error comparator 400 may include a maximum threshold comparator 410 for comparing the output signal of the rotation error detector 300 with a maximum value of the preset error tolerance range, and an output signal and a preset error tolerance range of the rotation error detector 300. OR gate 430 outputs the microcomputer 500 to detect whether a failure is detected by ORing the comparison result of the lowest threshold comparator 420 and the highest threshold comparator 410 and the comparison result of the lowest threshold comparator 420. It is composed.

Hereinafter, an operation process of the tray rotation failure detecting device including the individual components as described above will be described with reference to FIG. 6 with reference to FIG. 5. At this time, in order to help the understanding of the present invention, a detection signal corresponding to one rotation of the tray will be described. For convenience, each low pulse is assumed to be -5V for 0V.

First, a signal (that is, a pulse signal including an ID pulse and a start / end signal) detected by a conventional sensor (not shown) is applied to the first low pass filter 100 and integrated first, and the first order. The integrated first integrated signal s1 is applied to the second low pass filter 200 again. At this time, in order to distinguish it from the output signal of the second low pass filter 200 which will be described later, the output signal integrated in the first low pass filter 100 is referred to as a first integration signal s1, and the second low pass filter ( The output signal integrated at 200 is referred to as a second integrated signal s2. For example, the first integrated signal s1 may have a waveform as shown by s1 in FIG. 6A at constant speed, FIG. 6B at slow speed, and FIG. 6C at high speed, respectively. In other words, when the speed is slow, the holding time of each pulse is longer than that at the constant speed, and the holding time of each pulse is short at high speed.

The first integrated signal s1 is secondarily integrated in the second low pass filter 200, and the integrated second integrated signal s2 is one end of the error detector 300 (for example, the non-inverting terminal (+). Is applied to)). At this time, the second integrated signal s2 will be a waveform having an almost constant level, as shown in Figs. 6A, 6B and 6C, and the level will be the average voltage for each detection signal. At this time, compared to the second integrated signal s2 at constant speed, the second integrated signal s2 at slow speed will have a higher voltage level, and the second integrated signal s2 at high speed will have a lower voltage. Will have a level.

That is, referring to the example of the pulse holding time in the description in the prior art, the signal detected when the tray of the disk chain having three dishes is rotated one by one includes six ID pulses and 12 start / end pulses. Appears. In this case, since the ID pulse is 20 msec and the start / end code is 60 msec, it can be seen that the total low pulse is generated from (20 msec × 6) + (60 msec × 12) to 840 ms. Accordingly, the time for applying -5V to the first low pass filter 100 is 840 ms in total.

On the other hand, in the signal detected when the tray of the disc chain having three dishes is rotated once, there are six 0V sections between the ID pulse and the start / end pulse, and nine 0V between the start / end pulses. There is a section, and there are three 0V sections in the ID pulse. At this time, if the interval between start / end pulse is 60msec like the start / end pulse and the interval between ID pulses is 20msec like ID pulse, the interval between ID pulse and start / end pulse is 350msec, so (60msec × 9 It can be seen that a total of 2800 msec is obtained from) + (20 msec × 3) + (350 msec × 6). That is, it can be seen that 0 V is applied to the first low pass filter 100 for 2800 msec.

Therefore, since the time for applying 0V is about 3.5 times compared to the time for applying -5V, when the tray rotates slowly compared to the constant speed and the total pulse width is increased, the 0V section becomes 3.5 times larger than the -5V section. . As a result, the voltage level of the second integrated signal is increased when the tray rotates at a low speed than the voltage level of the second integrated signal at the constant speed.

On the other hand, when the tray rotates slowly compared to the constant speed and the total pulse width decreases, the 0V section is reduced by 3.5 times compared to the -5V section. As a result, the voltage level of the second integrated signal is reduced than the voltage level of the second integrated signal at constant speed when the tray rotates at a low speed.

As described above, the second integrated signal s2 output from the second low pass filter 200 is applied to one input terminal (for example, the non-inverting terminal (+)) of the error detector 300, and the other end thereof. (For example, differentially amplified between the reference signal Vr applied to the inverting terminal (-), an error signal is generated. At this time, the reference signal Vr is a value preset by a plurality of experiments, and will be a voltage level of the second integrated signal when the tray rotates at a constant speed.

The error signal output from the error detector 300 is input to one end of each of the highest limit comparator 410 and the lowest limit comparator 420 included in the error comparator 400.

The error signal input to one input terminal (eg, the non-inverting terminal (+)) of the highest limit comparator 410 is equal to the preset error tolerance input to the other end (eg, the inverting terminal (-)). Compared to the highest limit value Emax, the comparison result is applied to one end of the OR gate 430. At this time, the comparison result of the input error signal with the highest limit value Emax will be displayed as a high or low pulse (for example, high if the input error signal is greater than the maximum limit value Emax and low pulse if the value is smaller). Here, the error signal is larger than the maximum limit value Emax means that the rotation error of the tray roulette rotates slower than the minimum speed that can control the error.

Meanwhile, in the lowest limit comparator 420, an error signal output from the error detector 300 is input to an input terminal (for example, an inverting terminal (−)) opposite to that of the highest limit comparator 410, and the other end thereof (for example, , Compared with the lowest limit value Emin of the error tolerance applied to the non-inverting terminal (+), and the comparison result is at the other end of the OR gate 430 (that is, the other end of the input terminal of the highest limit comparator 410). In this case, the comparison result of the inputted error signal with the lowest limit value Emin may be displayed as a high or low pulse (for example, if the input error signal is less than the minimum limit value Emin, high, if the value is low pulse). In this case, the error signal being smaller than the minimum limit (Emin) means that the rotational error of the tray roulette rotates faster than the maximum speed that can control the error.

The output of the highest limit comparator 410 and the output of the lowest limit comparator 420 applied to one input terminal and the type force terminal of the OR gate 430 are ORed, and the result of the calculation is output as high or low, and the microcomputer 500 is output. Is provided. At this time, in the above-described example, if a high pulse is generated at either the output of the highest limit comparator 410 and the lowest limit comparator 420, a high pulse will be generated at the OR gate 430, which is the rotation of the tray roulette. It means that the speed is faster or slower than the speed that can control the rotational error. That is, it means a state in which the rotational error cannot be controlled beyond the error control range.

Therefore, as described above, when a high pulse is applied from the OR gate 430, the microcomputer 500 determines that a rotation failure has occurred, and will control to stop driving of the tray roulette driver, not shown.

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.

As described above, according to the present invention, by detecting in the hardware the rotation failure of the rotation speed of the tray roulette exceeds the rotation control range of the tray roulette, by sharing the function of the microcomputer (or processor), the lifespan according to the reduction of the workload of the microcomputer The cost savings can be achieved by not having to adopt the high performance microcomputer or the high performance microcomputer.

Claims (2)

In the rotation failure detection device of the optical disc changer system for detecting whether the rotational speed of the tray roulette is out of the rotation control range by using the pulse signal indicating the ID code and start / end code of each dish, A first low pass filter integrating a pulse signal representing an ID code and a start / end code of the dish to output a first integrated signal; A second low pass filter for integrating the first integrated signal once more to output a second integrated signal; An error detector for differentially amplifying the second integrated signal and a predetermined reference speed and outputting an error signal; And an error comparison unit for comparing the error signal with an error tolerance and outputting the comparison result. The method of claim 1, wherein the error comparison unit, A maximum threshold comparison unit comparing whether the error signal is larger than a maximum value of a preset error tolerance range; A minimum threshold comparison unit for comparing whether the error signal is smaller than a minimum value of a preset error tolerance range; And an OR gate configured to logically add a comparison result of the highest limit comparison unit and a comparison result of the lowest limit comparison unit to output a result indicating whether a rotation failure occurs.

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