KR20040066653A - Method for controling a spindle motor in optical disc device - Google Patents

Abstract

PURPOSE: A method for controlling a spindle motor in an optical disk device is provided to change a close loop control method into an open loop control method when changing a speed while recording or reproducing data, and to change into the close loop control method when the speed changing is completed, thereby continuously changing the speed without disconnection. CONSTITUTION: When an optical disk is inserted(S10), a microcomputer carries out a general servo operation(S11), and preforms a series of data recording/reproducing processes(S12). If a data recording process is changed at a low speed(S13), the microcomputer changes into an open loop control method(S14). The optical disk continuously executes the data recording process without disconnection(S15). If the speed changing is completed(S16), the microcomputer changes into a close loop control method(S17). If the data recording process is completed or the reproducing process is completed(S18), the microcomputer stops a rotation of a spindle motor(S19).

Description

Method for controlling a spindle motor in optical disc device

The present invention provides a method of controlling a spindle motor in an optical disc apparatus in order to variably control the rotational speed of the spindle motor by using an open loop control method when the speed is changed during data recording or reproducing. It is about.

FIG. 1 shows a part of an optical disk apparatus to which a general spindle motor control method is applied. The optical disk apparatus includes a controller 10, a motor driver 11, a spindle motor 12, and an FG detector 13. ) May be configured to include.

On the other hand, the controller 10 outputs a control signal (DMO: Disc Motor Out) for controlling the spindle motor in order to rotate the optical disk (not shown) inserted and seated in the device at high speed, and the motor driver 11 ), A driving pulse of a voltage corresponding to the control signal DMO is applied to the spindle motor 12.

In addition, the spindle motor 12 is rotated at a high speed by a driving pulse applied through the above process. At this time, an FG pulse is generated according to the rotation of the spindle motor, so that the FG detector 13 The FG detector 13 counts the number of FG pulses and detects and outputs an RPM (Ratio Per Minute) value corresponding to the rotational speed of the spindle motor.

In addition, the controller 10, after checking the difference value between the RPM value output from the FG detector 13 and the target RPM (Target RPM) value to control the spindle motor, the control corresponding to the difference value The rotational speed of the spindle motor is controlled by using a series of closed loop control schemes that output signals.

On the other hand, in the optical disk apparatus, when the speed is changed while performing a data recording or reproducing operation, for example, as shown in FIG. 2, the spindle at a rotation speed corresponding to the first target RPM (Target RPM 1) If the data recording operation is changed to a low speed while recording data while controlling the motor, the data recording operation until the spindle motor is variably controlled at a rotation speed corresponding to the second target RPM (Target RPM 2). Will pause (Rec_Pause).

When the rotation speed of the second target RPM is reached, the data recording operation is performed again. The reason for this is according to the characteristic of the closed loop control method, as shown in FIG. ), The data recording or reproducing operation is temporarily stopped, and the time required for the recording or reproducing operation becomes long, and due to the discontinuous data signal processing, at the time of resuming the recording or reproducing operation There is a problem that a link error occurs.

Accordingly, the present invention was devised to solve the above problems, and during the data recording or reproducing operation while rotating control of the spindle motor included in the optical disk device using a closed loop control method, In the case of changing the speed, the present invention provides a spindle motor control method in an optical disk device for changing and controlling data in an open loop control method and continuously performing data recording or reproducing operations. The purpose is.

FIG. 1 illustrates some components of an optical disk apparatus to which a general spindle motor control method is applied.

2 is a diagram illustrating the rotational speed and the recording operation state of the spindle motor variably controlled by a general spindle motor control method.

FIG. 3 is a block diagram of an optical disk apparatus to which the spindle motor control method according to the present invention is applied.

4 is a flowchart illustrating the operation of the spindle motor control method in the optical disk apparatus according to the present invention;

5 is a diagram showing the rotational speed and the recording operation state of the spindle motor that is variably controlled by the spindle motor control method according to the present invention.

※ Explanation of code for main part of drawing

10 controller 11 motor driver

12: spindle motor 13: FG detector

20: switch 21: A / D converter

22: micom 23: D / A converter

Spindle motor control method in the optical disk device according to the present invention for achieving the above object, while performing a data recording or reproducing operation while the rotation control of the spindle motor included in the optical disk device using a closed loop control method Stage 1; Two steps of continuously performing a data recording or reproducing operation while changing the closed loop control scheme to an open loop control scheme when changing the speed of the data recording or reproducing operation; And three steps of continuously performing data recording or reproducing operations while changing the open loop control method to the closed loop control method when the double speed change is completed.

In addition, the spindle motor control method in the optical disk apparatus according to the present invention comprises: a step of maintaining the motor speed at a constant value in a closed loop control method when the speed of the spindle motor in the optical disk apparatus; Switching the closed loop control method to an open loop control method when the speed of the spindle motor is changed; And converting the open loop control method to the closed loop control method when the speed change of the spindle motor is completed.

Hereinafter, a preferred embodiment of a spindle motor control method in an optical disk apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 shows a part of an optical disk apparatus to which the spindle motor control method according to the present invention is applied. The optical disk apparatus includes the controller 10 and the motor driver 11 as described above with reference to FIG. 1. ), The spindle motor 12, and the FG detector 13 may be included. The switch 20, the A / D converter 21, the microcomputer 22, and the D / A converter 23 may also be included. It can be configured to include more.

On the other hand, in the controller 10, in order to rotate the optical disk (not shown) inserted and seated in the device at high speed, a control signal (DMO) for controlling the spindle motor is output, and in the motor driver 11, The driving pulse of the voltage corresponding to the control signal DMO is applied to the spindle motor 12, and the spindle motor 12 rotates at high speed by the driving pulse.

And. An FG pulse is generated according to the rotation of the spindle motor, and is output to the FG detector 13. In the FG detector 13, the number of the FG pulses is counted, and an RPM corresponding to the rotational speed of the spindle motor is obtained. The controller 10 detects and outputs a value, and after checking the difference value between the RPM value output from the FG detector 13 and a target RPM value for controlling the spindle motor, the difference is determined. The rotational speed of the spindle motor is controlled by using a series of closed loop control schemes that output control signals corresponding to the values.

On the other hand, in the microcomputer 22, when the speed is changed during the data recording or reproducing operation, the switch 20 is controlled to be switched so that the open loop control scheme for the spindle motor can be changed and used. In addition, even when the speed is changed, the data recording or reproducing operation is performed continuously, which will be described in detail as follows.

4 is a flowchart illustrating a method for controlling a spindle motor in the optical disk apparatus according to the present invention. In the microcomputer 22, when the optical disk is inserted and seated in the apparatus (S10), the switch 20 is controlled to be controlled. Thus, a general servo operation by a closed loop control method in which the control signal DMO of the controller 10 is applied to the motor driver 11 is performed (S11).

In response to a user's request, a data recording or reproducing operation of recording or reproducing data is performed on the optical disc (S12). When a change in speed is requested, for example, as shown in FIG. Similarly, when the data is recorded while the data is being recorded while controlling the spindle motor at a rotational speed corresponding to the first target RPM (Target RPM 1) using the closed loop control method (S13). In the microcomputer 22, the switch 20 is switched so that the control signal DMO ′ of the microcomputer 22 output through the D / A converter 23 is applied to the motor driver 11. The open loop control scheme is changed and applied (S14).

On the other hand, in the microcomputer 22, while referring to the control data of the controller A / D converted by the A / D converter 21, the spindle at a rotational speed corresponding to the second target RPM (Target RPM 2) Until the motor is variably controlled, the rotational speed of the spindle motor is gradually controlled. In this case, the optical disk apparatus continuously performs the data writing operation without disconnection (S15).

When the speed change to the second target RPM value is completed through the above process (S16), the microcomputer 22 switches the switch 20 to its original state and outputs it from the controller 10. The control signal DMO is changed to apply the closed loop control method input to the motor driver 11 (S17).

Thereafter, when the data recording operation ends or the reproduction operation ends (S18), the microcomputer 22 performs a series of servo control operations for stopping the rotation of the spindle motor (S19). It is possible to prevent the recording or reproducing operation from being temporarily disconnected.

On the other hand, in the conventional closed loop control, the reason why the data recording or reproducing operation is stopped in the speed change section of the motor is because the closed loop type control has unstable motor speed due to the transient response characteristic. This is because reproduction or recording deteriorates reproduction or recording characteristics. Therefore, in the present invention, in the speed change section of the motor, the control method is changed to an open loop. In the control of the open loop method, when the speed decrease of the motor is slow, the transient response can be adjusted to be small or non-transient, and the transient response If this value is small or absent, the speed of the motor is not unstable, and playback and recording are possible.

Therefore, in the open loop control, it is necessary to adjust the speed change of the motor so that the transient response of the motor control signal does not affect the reproduction or recording characteristics. For this purpose, the microcomputer of the microcomputer 22 of FIG. The control signal (DMO) is preferably determined so that the speed can be adjusted within the range that the transient response does not come out by experiment.

Or more, preferred embodiments of the present invention described above, for the purpose of illustration, those skilled in the art, within the technical spirit and the technical scope of the present invention disclosed in the appended claims below, to further improve various other embodiments Changes, substitutions or additions will be possible.

Spindle motor control method in the optical disk device according to the present invention configured and configured as described above, while rotating the spindle motor included in the optical disk device using a closed loop control method, data recording or When the speed is changed during the reproducing operation, the control is changed by the open loop control method, and the data recording or reproducing operation is continuously performed, and when the speed change is completed, the closed loop control is performed. It is a very useful invention that the data recording or reproducing operation can be carried out continuously without interruption by changing the speed, thereby making the data recording or reproducing operation faster and more stable.

Claims (6)

A step (1) of performing a data recording or reproducing operation while rotating control of the spindle motor included in the optical disc apparatus using a closed loop control scheme; Changing the closed loop control method to an open loop control method and continuously performing a data recording or reproducing operation when changing the speed of the data recording or reproducing operation; And Comprising three steps of changing the open loop control method to the closed loop control method, and performing data recording or reproducing operation continuously when the double speed change is completed, the spindle motor control method in the optical disk device . The method of claim 1, In the second step, the variable speed of the spindle motor is gradually controlled by using the open loop control method until the rotation speed of the spindle motor corresponding to the double speed to be changed is achieved. To control spindle motors The method of claim 1, In step 3, the FG pulses detected by the rotation of the spindle motor are counted to calculate an RPM value corresponding to the current spindle motor rotation speed, and then the RPM value is to be changed. And the open loop control method is changed back to the closed loop control method when the value is matched with a target RPM value. When controlling the speed of the spindle motor in the optical disk device, Maintaining the motor speed at a constant value in a closed loop control method; Switching the closed loop control method to an open loop control method when the speed of the spindle motor is changed; And When the speed change of the spindle motor is completed, the spindle motor control method of the optical disk device, characterized in that consisting of three steps of switching the open loop control method to a closed loop control method. The method of claim 4, wherein The spindle motor control method of the optical disk apparatus, characterized in that for performing the open loop control of the two stages, the optical disk playback or recording operation. The method of claim 4, wherein In the two-stage open-loop control method, the spindle motor control method of the optical disc apparatus, wherein the speed change of the motor is adjusted so that the transient response of the motor control signal does not affect the reproduction or recording characteristics. .