KR100296618B1 - Optical disc rotation stop device and method - Google Patents

Abstract

The present invention relates to an optical disk rotation stop device and a rotation stop method, wherein the optical disk rotation stop device according to the present invention has an optical disk seated on an upper surface, and at the bottom thereof, as shown in FIG. An optical pickup turn-table 10 formed; An optical pickup 20 for reading recording data of an optical disc seated on the optical pickup turntable; A photo diode (30) provided at one side of the optical pickup 20 and moved together when the optical pickup moves; And an optical pickup moving tool 40 which moves in both directions along the guide bar 41 by the composition of the sled motor, and moves the optical pickup 20 and the photo diode 30 fixedly mounted on an upper surface thereof. By completely stopping the disk rotation even during abnormal circuit driving, it is possible to eliminate the occurrence of physical damage and mechanical failure of the optical disk by touching the apparatus without the disk being rotated. It is a very useful invention to prevent the disc from being thrown out and the user may be injured by ejecting the tray without stopping.

Description

Optical disk rotation stop device and method

The present invention relates to an optical disk rotation stop device and a rotation stop method, and more particularly, by determining whether the optical disk is rotated or stopped through the rotation of the optical disk turntable, thereby confirming that the disk rotation is completely stopped even during abnormal circuit driving. The present invention relates to an optical disk rotation stop device and a rotation stop method capable of removing physical damage and mechanical defects of an optical disk by performing an operation such as a tray discharge afterwards.

FIG. 1 shows a mechanical configuration of a general optical disk rotation stop device, in which an optical disk is seated on an upper surface, and an optical pick-up turntable in which a region having a different reflecting dose is repeatedly formed crosswise along the circumferential direction on the lower surface thereof. table) 10; An optical pickup 20 for reading recording data of an optical disc seated on the optical pickup turntable; And an optical pickup moving tool 40 for moving the optical pickup 20 fixedly mounted on the upper surface while bidirectionally moving along the guide bar 41 by the drive of a sled motor. .

FIG. 2 is a block diagram showing the respective components of FIG. 1 and the circuit portion for operating and controlling them, comprising: a spindle motor 12 for rotating the optical pickup turntable 10; A motor driver 14 for controlling the drive of the spindle motor 12; A sled motor 22 for moving the optical pickup 20; A motor driver 24 controlling the driving of the sled motor 22; A servo unit 50 for controlling the motor drivers 14 and 24; A key input unit 60 into which a user command is input; A dropout detector (65) which detects whether the focus is dropped from the R / F unit output signal read out by the optical pickup (20); And a microcomputer 70 for overall control of the process.

In order to eject and replace a disk, the optical disk must be stopped once by using the optical disk rotating device configured as described above. Hereinafter, a conventional optical disk rotating stop process will be described with reference to the third drawing.

If a condition on the premise that the disk rotation stops, such as a disk tray ejection command, is set by the user through the key input unit 60 (S110), the microcomputer 70 once checks whether the disk is currently rotating (S112). If it is not rotating, immediately perform a command such as tray discharge and end (S126). However, if the disc is rotating, the user request command is executed after finally checking whether the disc is stopped or not through the following process.

Once, the microcomputer 70 checks whether the rotating disk is in constant speed (S114), and controls the servo unit 50 at the constant speed, thereby causing the motor driver 14 to perform the spindle motor ( 12, the rotation speed of the disk is gradually reduced.

If a predetermined time elapses after the reverse voltage is applied and the disk is decelerated to a predetermined speed or less, the predetermined signal is input from the servo unit 50 to the microcomputer 70, and the microcomputer 70 sets the speed reduction signal. After continuously checking whether the input of (S118), based on the input signal to calculate the time to apply the reverse voltage to the spindle motor 12 for the final rotation stop of the optical disk (S120), By applying the reverse voltage only for the calculated time (S122), after stopping the rotation of the spindle motor 12 (S124) was discharged to the outside and terminated (S126).

On the other hand, when it is determined that the speed is not constant in the disc speed check step (S114), the microcomputer 70 is a focus-drop (focus-drop) caused by the cause or the external shock due to damage to the disc, etc. After checking whether the signal is input from the dropout detection unit 65 or not (S130), if it is not the focus drop, the reverse voltage remains based on the empirical value based on the time when the constant voltage is applied to the spindle motor 12. After calculating the time (S132), and applying the reverse voltage only for the calculated time (S134, S122) to stop the rotation of the spindle motor 12 (S124) was discharged to the outside and terminated (S126).

However, if the focus drop is confirmed in the focus drop check step (S130), since there is no time basis for applying a reverse voltage, immediately after the power supply to the spindle motor 12 is cut off regardless of whether the optical disk is rotated (S130). In this case, the tray was discharged and finished.

In the conventional optical disc rotation stop device and the rotation stop method constructed and constructed as described above, the rotation speed of the disc cannot be detected in a circuit when the focus is dropped due to damage of the optical disc or external impact, etc. The application of power to the spindle motor 12 was immediately stopped without applying voltage. As a result, the rotation state of the disk is maintained for a certain time even after the power is stopped, so that the rotation of the disc does not stop. By contacting the mechanism of the chaser, there is a problem that the disk surface is damaged or detached from the mechanism, causing a mechanism inoperable state.

In addition, even when the focus is dropped during the deceleration in the constant speed rotation state of the disc, the deceleration degree cannot be detected in a circuit. Therefore, when the reverse voltage is applied for a normal time or more, the reverse rotation is performed at a high speed in the reverse direction. Has a problem that the disc is ejected at a high speed and is dangerous to the user when the tray unit is opened or the disc changer is changed to a disc changer device when the disc is not completely stopped.

Therefore, the present invention was created to solve the above problems, and the optical disk rotation stop device and rotation stop method that can completely eliminate the physical damage and mechanical failure of the optical disk by completely stopping the disk rotation even during abnormal circuit driving The purpose is to provide.

1 is a mechanical configuration diagram of a conventional optical disk rotation stop device,

2 is a block diagram of a conventional optical disk rotation stop device,

3 is a flowchart of a conventional optical disk rotation stop method,

4 is a mechanical configuration diagram of an optical disk rotation stop device according to the present invention,

5 shows a comparison of the bottom surfaces of the optical disk turntables of FIGS. 4 and 1, respectively.

6 is a block diagram of the configuration of the tube disk rotation stop device according to the present invention,

7 is a flowchart of the optical disk rotation stop method according to the present invention.

* Explanation of symbols for main parts of the drawings

10 optical disc turntable 12 spindle motor

14, 24: motor driver 20: optical pickup

22: sled motor 30: photodiode

40: optical pickup moving port 41: guide bar

50: servo unit 60: key input unit

65: Drop-out detector 70: Micom

An optical disk rotation stop device according to the present invention for achieving the above object comprises: a reflecting means having a plurality of regions having different amounts of reflected light are formed in the optical disk mounting portion; Photoelectric conversion means for converting and outputting light reflected from the reflecting means into an electric signal; Detection means for detecting a change in the rotational speed of the optical disc seating part by the electric signal; And control means for determining whether to turn off the power to the optical disk rotation driving means according to the detected rotation speed change.

An optical disk rotation stop method according to the present invention comprises: a first step of applying a reverse voltage to an optical disk rotation driving means when an optical disk stop related command is input; A second step of detecting a change in rotation speed based on whether a pulse signal is detected according to a periodic change in the magnitude of reflected light when the optical disc seating unit rotates according to the reverse voltage applied; And a third step of interrupting power supply to the optical disk rotation driving allowance based on the detection result.

Hereinafter, the configuration and operation of a preferred embodiment of the optical disk rotating apparatus and the rotating method according to the present invention will be described in detail with reference to the accompanying drawings.

4 is a view illustrating a mechanical configuration of an optical disk rotating apparatus according to the present invention, in which an optical disk is seated on an upper surface, and an optical disk is formed on the lower surface of which an area having different amounts of reflected light is repeatedly cross-crossed as shown in FIG. A pickup turn-table 10; An optical pickup 20 for reading recording data of an optical disc seated on the optical pickup turntable; A photo diode (30) provided at one side of the optical pickup 20 and moved together when the optical pickup moves; And an optical pickup moving tool 40 for moving the optical pickup 20 and the photo diode 30 fixedly mounted on an upper surface thereof while bidirectionally moving along a guide bar 41 by driving a sled motor. ) Is configured to include.

FIG. 6 is a block diagram showing the respective components of FIG. 5 and the circuit portion for operating and controlling them, comprising: a spindle motor 12 for rotating the optical pickup turntable 10; A motor driver 14 for controlling the drive of the spindle motor 12; A sled motor 22 for moving the optical pickup 20; A motor driver 24 controlling the driving of the sled motor 22; A servo unit (Digital Signal Processing) 50 for controlling the motor drivers 14 and 24; A key input unit 60 into which a user command is input; And a microcomputer 70 which collectively controls the signal detection from the photo diode 30 and other processes.

The process of completely stopping the rotation of the optical disc using the optical disc rotation stop device configured as described above will be described in detail with reference to FIGS. 7A and 7B showing the flow thereof.

When a user inputs a command to stop the disk rotation such as a disk tray ejection command through the key input unit 60 (S10), the microcomputer 70 once confirms whether the disk is currently rotating (S12). If it is not rotating, immediately perform a command such as tray discharge and end (S26). However, if the disc is rotating, the discharge command is executed after finally checking whether the disc is stopped by the following process.

Once, the microcomputer 70 checks whether the disk being rotated is running at constant speed (S14), and if it is at constant speed, stops the disk through the same process as before (S16, S18, S20, S22, S24, S26), the tray is discharged to the outside.

However, when it is determined that the rotating disk is not constant speed in the constant speed checking step (S14), or the speed decrease signal is not input in the speed decrease signal input checking step (S18) and the cause is confirmed to be the focus drop. In (S30), since the disk rotation stop is not possible through the same process as in the normal case, it is determined whether the disk rotation stops through a separate process as follows.

First, the micom 70 drives the sled motor 12 through the servo unit 50 to move the optical pickup 20 to the innermost circumference (S40), so that the optical pickup 20 It is positioned below the turntable 10.

If the disk is rotating after the optical pickup is moved, the turntable 10 will also be rotated. In this case, as shown in FIG. 5, the reflection reflected from the reflection surface and the non-reflection surface formed on the bottom of the turntable 10 will be described. Since the amount of light will cross over time, the photodiode 30 attached to one side of the optical pick-up 20 will detect this and output a pulse signal having a width corresponding to the crossing period.

Therefore, the microcomputer 70 checks whether the pulse signal is input from the photodiode 30 (S42), and when it is determined that it is not output, the optical disc is completely stopped rotating while moving to the inner circumference of the optical pickup 20. Determined to discharge the tray (S52).

However, if the pulse signal is output, since the optical disk is not rotated yet, the microcomputer 70 drives the servo unit 50 to apply a reverse voltage to the spindle motor 12 (S44). It is detected whether or not the rotation signal pulse width is changed by the applied reverse voltage (S46).

That is, if the rotational speed of the disk decreases due to the reverse voltage, the cross period of the reflected light amount is increased, and thus the width of the detected pulse signal must be gradually increased, so that the width of the pulse signal is increased in the micom 70. Once it is confirmed whether or not (S46), and then the rotational speed decreases and then reaches whether the speed reaches the same speed as when the rotation is almost stopped, that is, when it is confirmed that the pulse width of a predetermined value is reached (S48). In step S550, the disc is stopped, and the tray is discharged to the outside (S52). If the disk is completely stopped, the width of the pulse signal is no longer changed. Instead, only the high or low level signal is continuously maintained depending on whether the region located directly above the photodiode 30 is a reflective or non-reflective surface. Will be detected.

In the winter when it is confirmed that the pulse width does not increase in the pulse width increase step (S46) even though the reverse voltage is applied (S44), first, the reverse voltage is not properly applied, or, rather, the excessive reverse voltage Since the rotational speed is increasing in the opposite direction due to the application, the microcomputer 70 rechecks whether the reverse voltage is being applied to the spindle motor 12 (S60), and then the reverse voltage is applied. If it is being performed, it is determined that it is in excessive reverse rotation, and instead of stopping further application of reverse voltage, by applying a forward voltage (S62), the rotation speed is reduced, and the process of checking the increase or decrease of the pulse width (S46) is performed again. do.

However, if it is confirmed that the reverse voltage is not applied, after applying the reverse voltage again (S64), the process following the step of confirming whether the pulse width increases at all times (S46) is performed.

On the other hand, in the optical disk rotation stop device according to the present invention configured as described above, it is possible to determine whether the disk is inserted or not by using the pre-mounted photo diode 30, as well as when it is determined that the disk is inserted The sled motor 22 is driven to move the optical pickup 20 to the outer circumferential side of at least 8 cm, and then check whether the reflected light is detected again to determine whether the mounted disc is 8 cm or 12 cm. The type can also be determined.

In the optical disk rotation stop device and rotation stop method according to the present invention configured and configured as described above, the disk stops rotating by completely stopping the disk rotation even when the circuit is driven abnormally due to its own cause or external shock due to the damage of the disk. The physical damage and mechanical failure of the optical disc can be eliminated by touching the mechanism in the unused state, and the disc can be thrown out and the user may be injured by ejecting the tray without stopping. This is a very useful invention that can be used for the purpose of preventing the type of the optical disc, as well as preventing it.

Claims (4)

Reflecting means in which a plurality of regions having different amounts of reflected light are formed in the optical disc seating portion; Photoelectric conversion means for converting and outputting the light reflected from the reflecting means into an electric signal; Detection means for detecting a change in the rotational speed of the optical disc seating part by the electric signal; And And a control means for determining whether to shut off power to the optical disk rotation driving means, in accordance with the detected rotation speed change. The method of claim 1, And the detecting means includes a signal width detecting unit for detecting a change in pulse width of the output electrical signal. A first step of applying a reverse voltage to the optical disk rotation driving means when an optical disk stop related command is input; A second step of detecting a change in rotation speed based on whether a pulse signal is detected according to a periodic change in the magnitude of reflected light when the optical disc seating unit rotates according to the reverse voltage applied; And And a third step of interrupting power supply to the optical disk rotation driving means, based on the detection result. The method of claim 3, wherein The second step, A first substep of checking whether an increase in a pulse signal width is caused by decreasing a rotation speed of the optical disc seating unit; A second sub-step of re-confirming a reverse voltage of a voltage applied to the optical disk rotation driving means when the pulse signal width is not increased; And And a third substep of repeating the above steps until an increase in the pulse signal width is confirmed.