KR19980039978A - How to control the rotation speed of the tray roulette in the optical disk framer system - Google Patents

Abstract

The present invention searches for the ID of each of the dishes by the ID code and the start / end code of each of the dishes, which is generated when the tray roulette having a plurality of dishes is rotated. A method for controlling the tray roulette rotational speed of an optical disc system which stops the rotation of the tray roulette with a one-shot pulse after braking the rotation of the tray roulette, and the method for detecting the rotational speed of the tray roulette after rotating the tray roulette Stage 1; Searching for an ID of a pre-selected dish when a rotational speed of the tray roulette is detected; A third step of decelerating the rotation of the tray roulette by the PWM pulse when the start point of the AND code is detected after the ID of the pre-selected dish is detected; And a fourth step of stopping the rotation of the tray roulette by a one-shot pulse having a duty ratio preset to correspond to the rotation speed detected in the first step when the end point of the AND code is detected.

Description

How to control the rotation speed of the tray roulette in the optical disk framer system

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tray roulette rotational speed control method for controlling the rotational speed of a tray roulette in which an disk is seated.

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, in order to improve these points, an optical disc marker system has been developed. The optical disc marker system has a plurality of discs mounted in one tray and can be played sequentially. Device.

As described above, in the optical disc signer system, a tray is configured to mount a plurality of disks, and the tray includes a tray roulette mounted and rotatable.

FIG. 1 shows a structure of a disc tray in an optical disc signer system in which three discs can be mounted simultaneously.

As shown in FIG. 1, the disc tray includes a tray roulette 100, and the tray roulette 100 is provided with dishes 10, 20, and 30 for mounting a disc.

Each dish 10, 20, 30 of the tray roulette 100 is provided with an ID code for identifying the dish 10, 20, 30. For example, in FIG. 1, three dishes 10, 20, and 30 are assigned ID1, ID2, and ID3, respectively. This is for easily searching for the desired disk with the disks mounted on the dishes 10, 20, 30.

The conventional disk ID search is performed by a sensor 40, and the sensor 40 for ID search is separated by a certain angle 1 to the left from the disk chucking position Y as shown in FIG. It is located When the disc IDs are determined by the sensor 40, 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 hardware for performing such ID search and position control of tray roulette.

In FIG. 2, the tray roulette 100 is rotated by the driving of the driving unit 210, and the driving unit 210 is controlled by the control unit 220.

In addition, the ID detection sensor 40 generates a pulse capable of discriminating each dish as the tray roulette 100 rotates. That is, as shown in FIG. 3 (A), when the first dish 10 is opposed to the ID detection sensor 40 while the tray roulette 100 rotates, one low pulse A is generated and the second dish is served. Two low pulses B are generated when 20 is opposed to the ID detection sensor 40, and three low pulses C are generated when the third dish 30 is opposed to the ID detection sensor 40. . Therefore, the controller 220 counts the number of low pulses provided from the ID detection sensor 40 to determine the ID code of the corresponding dish.

At this time, in Figure 3 (A) is shown four low pulses between the ID code of each dish, which is to control the rotation and stop operation of the tray roulette 100, start / end code (start / end code). Usually, two low pulses among the four low pulses are called a start code (D) and two right low pulses are called an end code (E). This is performed by rotating the tray roulette 100 clockwise in the ID search mode. D) is detected first, and then the ID code is recognized by counting the number of low pulses detected after the start code D is detected. When the end code E is detected after ID code detection, the rotation of the tray roulette 100 is performed. Because it stops. The dish corresponding to the detected ID code is then stopped at the disc chucking position correctly. For example, if the start code D is detected and rotated clockwise to detect two low pulses, the ID is recognized as ID 2, and if the AND code E is detected after ID code 2 is detected, the tray roulette ( Stop rotation of 100). Then, the ID 20 of the ID 2 stops exactly at the disc chucking position. In this case, 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 100 rotates at constant speed, the low state time of the low pulse indicating 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 and end code, or between the start and end code and the ID code maintains a high state of 350msec. Therefore, checking the width of the low pulse indicates whether the detected pulse is a start / end code or an ID code.

On the other hand, in this way to rotate the tray roulette 100 to search for the ID of the dish, the rotational speed control of the tray roulette 100 is a drive pulse signal provided to the drive unit 210 from the control unit 220 (FIG. 3). (B)).

That is, the control unit 220 detects the start code D provided from the sensor 40 by rotating the tray roulette 100 clockwise by providing a high forward driving pulse F to the driving unit 210. . Then, when the ID code is detected and the falling edge of the first low pulse, which is the start point of the AND code E, is reached by the continuous rotation of the tray roulette 100, the braking PWM signal G having a certain duty ratio is generated. Provided to the drive unit 210 to reduce the rotational speed of the tray roulette 100. Then, when the rising edge of the second low pulse, which is the end point of the end code E, is reached, the controller 220 provides a reverse one-shot pulse H to the driver 210 to provide the tray roulette 100. Stop the rotation of the

As described above, in searching the IDs of the dishes 10, 20, and 30 and controlling the position of the tray roulette, the rotational speed of the tray roulette is very important for accurate position control. This is because the low pulse period of each ID code or start / end code described above may vary according to the rotation speed of the tray roulette 100. However, the rotation speed of the tray roulette is not properly controlled due to the deterioration of the characteristics of the rotary motor, the wear of the rotary gear or the rail, and the reduction of the lubricating fluid. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems. In performing the ID search and position control of the tray roulette, the tray roulette controls the tray roulette to stop accurately according to the rotational speed of the tray roulette converted due to an external environment. It is an object of the present invention to provide a rotation speed control method.

In order to achieve the above object, the present invention searches for the ID of each of the dishes by the ID code and the start / end code of each of the dishes generated when the tray roulette having a plurality of dishes rotates. A tray roulette rotational speed control method of an optical disc system for stopping the rotation of the tray roulette with a one-shot pulse after braking the rotation of the tray roulette by a braking PWM pulse; Detecting a rotational speed of the tray roulette after rotating the tray roulette; Searching for an ID of a pre-selected dish when a rotational speed of the tray roulette is detected; A third step of decelerating the rotation of the tray roulette by the PWM pulse when the start point of the AND code is detected after the ID of the pre-selected dish is detected; And a fourth step of stopping the rotation of the tray roulette by a one-shot pulse having a duty ratio preset to correspond to the rotation speed detected in the first step when the end point of the AND code is detected.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram of a disc tray in an optical disc holder system in which three discs can be mounted simultaneously.

2 is a hardware configuration diagram for performing ID search and position control of the tray roulette of the optical disc marker system.

Figure 3 (A) is a pulse waveform diagram generated to determine the ID of each dish in the tray roulette rotation of the optical disk marker system.

3B is a drive signal waveform diagram for rotating a tray roulette of an optical disk shader system.

4 is a control flowchart showing a preferred embodiment of the tray roulette rotational speed control method of the present invention.

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

40: ID detection sensor 100: tray roulette

210: driver 220: controller

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

4 is a detailed flowchart illustrating a preferred embodiment of the tray roulette rotational speed control method of the present invention. The tray roulette rotational speed control method of the present invention is for performing the ID search and position control of the tray roulette of FIG. You can use hardware. 2, the controller 220 detects the rotation speed of the tray roulette 100 using the low pulse width of the start / end code provided from the sensor 40, and the rotation speed of the tray roulette 100 is a reference speed. When faster or slower, the duty ratio of the one-shot pulse for stopping the rotation of the tray roulette 100 is provided to the driver 210 to control the rotating tray roulette 100 to be accurately stopped. It can be said.

Therefore, hereinafter with reference to Figures 2 and 3 and 4 described above.

First, when power is applied to the disk chaser system (S0), the control unit 220 automatically switches to a mode for determining the ID of the tray roulette 100.

That is, the controller 220 provides the driving unit 210 with a forward driving pulse having a predetermined level, and the driving unit 210 rotates the tray roulette 100 clockwise (S1). The controller 220 waits for a predetermined time, for example, 500 msec after providing a predetermined level of forward driving pulse to the driver 210, and then starts searching for the output of the sensor 40 after 500 msec (S2). ). At this time, the reason for waiting for 500msec in the S2 process is to leave time for the tray roulette 100 starts to rotate until a certain constant speed is reached.

When the falling edge of the low pulse output from the sensor 40 is detected as a result of the process S3 (S4), the controller 220 drives an internal counter to low state of the low pulse output from the sensor 40. The duration time is counted (S5). Then, when a rising edge of the low pulse output from the sensor 40 is detected (S6), the low state duration time T1 counted in step S5 is detected (S7) and the counter is reset (S8). ).

Then, the controller 220 searches whether there is a low state duration T2 previously stored in the internal memory (S9). If there is no low state duration T2 previously stored in the memory of the controller 220, the controller 220 detects the low state duration time T2. After storing the counted low state duration T1 in the internal memory (S10), the process S3 and below are performed again.

However, if there is a low state duration T2 previously stored in the memory inside the control unit 220, the previous low state duration T2 previously stored in the memory and the current low state duration T1 counted in step S5. It is checked whether the absolute value for the difference is less than or equal to the preset value (S11).

If the absolute value of the difference between the previous low state duration T2 previously stored in the memory and the current low state duration T1 counted in step S5 is less than or equal to the preset value, the controller 220 is stored in the memory. The previous low state duration T2 is erased, and the current low state duration T1 counted in step S5 is newly stored in the memory (S12).

However, if the absolute value of the difference between the previous low state duration T2 previously stored in the memory and the current low state duration T1 counted in step S5 is greater than the preset value, the controller 220 stores the previously stored value in the memory. Which of the low state duration T2 and the current low state duration T1 has a larger value is compared (S13).

As a result of the comparison, if the previous low state duration T2 previously stored in the memory is greater than the current low state duration T1 counted in step S5, the controller 220 may determine the previous low state duration time previously stored in the memory. T2) is determined as the low state duration of the start / end code (S14), and if the previous low state duration T2 previously stored in the memory is smaller than the current low state duration T1 counted in step S5, The controller 220 determines the current low state duration T1 counted in step S5 as the low state duration of the start / end code (S15).

Then, it is checked how long the low state duration T of the start / end code is (S16). That is, it is checked whether the low state duration T of the start / end code is contained within, for example, 45-54 msec, or 55-64 msec, or 65-74 msec.

In this way, the low state duration T of the start / end code is to know the rotational speed of the tray roulette 100.

On the other hand, if the low state duration T of the start / end code is checked, the controller 220 searches for the dish 10 of the ID 1. That is, the controller 220 first detects the start code provided from the sensor 40 as the tray roulette 100 rotates forward (S17), and if there is only one low pulse detected after the start code, ID code 1 is used. After recognizing (S18), the starting point of the detected AND code, that is, from the falling edge of the AND code (S19), the braking pulse having a duty cycle of a certain period is provided to the drive unit 210 of the tray roulette 100 Reduce the rotation speed (S20).

Then, when the end point of the end code is reached (S21), the control unit 220 provides a reverse one short pulse to the driving unit 210 (S22) to stop the rotation of the tray roulette 100.

At this time, if the low state duration of the start / end code checked in step S16 is included within 45-54 msec, it is determined that the rotational speed of the tray roulette 100 is faster than the reference speed, and a reverse one-short pulse having a pulse width of 12 msec is generated. When the low state duration of the start / end code is included within 55-64 msec, it is determined that the rotation speed of the tray roulette 100 is the same as the reference speed, and outputs a reverse one-short pulse having a pulse width of 8 msec. When the low state duration of the code is included within 65-74 msec, it is determined that the rotational speed of the tray roulette 100 is slower than the reference speed, and outputs a reverse one short pulse having a pulse width of 4 msec to stop the rotation of the tray roulette 100. do.

At this time, the duty ratio of the reverse one-short pulse corresponding to the low state duration of the start / end code may be a value set to accurately stop the tray roulette according to the rotational speed of the tray roulette.

As described above, the present invention has an effect that the position control of the tray roulette can be performed more easily by checking the rotational speed of the tray roulette and varying the duty ratio of the reverse one short pulse corresponding to the rotational speed of the tray roulette. .

Claims (2)

The ID of each dish is searched by the ID code and start / end code of each dish generated when the tray roulette having a plurality of dishes is rotated. Once the ID is found, the tray roulette is driven by a braking PWM pulse. A tray roulette rotational speed control method of an optical disc system which stops rotation of a tray roulette with a one-shot pulse after braking the rotation once; Detecting a rotational speed of the tray roulette after rotating the tray roulette; Searching for an ID of a pre-selected dish when a rotational speed of the tray roulette is detected; A third step of decelerating the rotation of the tray roulette by the PWM pulse when the start point of the AND code is detected after the ID of the pre-selected dish is detected; And a fourth step of stopping the rotation of the tray roulette by a one-shot pulse having a preset duty ratio corresponding to the rotation speed detected in the first step when the end point of the AND code is detected. Tray roulette rotation speed control method. 2. The method of claim 1, wherein the first step comprises: rotating the tray roulette when power is on; Detecting the start / end code; Checking a low state duration of the start / end code; And recognizing the low state duration of the start / end code as the rotational speed of the tray roulette.