JPH07240064A - Control circuit for disk motor fo optical disk device - Google Patents

Abstract

PURPOSE:To unnecesitate a memory storing brake operation time information by performing FG control by a FG control signal responding to a rotation stop instructing signal of a motor and performing stop control by a rotation stop signal responding to a lock signal. CONSTITUTION:A microcomputer 10 controls a selected output of a selector 7, at the time of normal CLV control, a control signal from a CLV control section 5 is switched from CLV control to FG control when a stop instruction is made, and a FG control signal from a FG control section 6 is outputted to the selector 7. When the number of revolution is, for example, 60rpm and the microcomputer 10 receives a lock signal from a FG control section 11, also switches it from FG control to stop control, and sends out a brake on signal making a stop control section 9 to generate the brake signal for prescribed time. And the microcomputer 10 outputs a signal from the stop control section 9 through the selector 7, and makes a disk rotate stably and stop.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc motor control circuit for an optical disc device, and more particularly to a disc motor control circuit for an optical disc device for controlling the rotation of a disc.

[0002]

2. Description of the Related Art Constant linear velocity (CLV) control for maintaining the rotation of an optical disc (hereinafter referred to as a disc) of an optical disc device at a constant linear velocity is a wobble signal in which pregroove information engraved on the disc is detected by an optical pickup. Based on. Further, the control for stopping the rotation of the optical disc is stored in the ROM as an appropriate braking time determined for the time information of the disc as a table, and when a stop instruction is given, it is determined from the time information for the reproduction position of the disc. The ROM table is searched, and the braking operation is started and stopped based on the obtained time.

FIG. 4 shows a configuration example of a disk motor control circuit of a conventional optical disk device. Disk 1
Is rotationally controlled by the motor 2 which is driven and controlled by the motor driver 8. The information stored in the disc 1 detected by the pickup 3 is stored in the wobble detector 4
According to the pre-groove engraved on the disc,
A wobble signal is detected. The CLV control unit 5 generates a CLV control signal based on the detected wobble signal and the reference clock signal from the reference clock generation unit 6, and sends it to the selector unit 7. The decoder 12 decodes the wobble signal and sends the decoded signal to the microcomputer 10.

When a disc rotation stop instruction is issued, the microcomputer 10 reads out an appropriate brake operation time stored in a ROM (table) 13 based on the disc time information included in the decode signal, and performs stop control. It is sent to the section 9. The stop signal output from the stop control unit 9 is sent to the selector unit 7.

Based on the select signal from the microcomputer 10, the selector section 7 receives the signal from the CLV control section 5 during the CLV control and the signal from the stop control section 9 during the stop control.
Each is selectively output to the motor driver unit 8 to control the rotation of the motor 2.

On the other hand, when the disk is running out of control, the rotation speed is not known, and if the brake time is set excessively, it will reverse, so it will be left for a predetermined time and other operations will be performed. Suspend.

[0007]

As described above, the disk motor control circuit of the conventional optical disk device performs CLV control based on the wobble signal obtained from the pre-groove engraved on the disk, and also performs stop control. R
It is performed based on the appropriate braking time stored in the OM. In case of a runaway, leave it for a predetermined time,
Other operations are stopped.

By the way, n-fold speed control of a disk has been put into practical use. In this device, two types of tables for 1-fold speed control and n-fold speed control are stored in the ROM, and the brake control for each is performed. On the other hand, in the case of a runaway, I left it alone.

However, in the case of an n-speed device,
Since the disk motor has a high-speed rotation specification, the rotation speed at the time of runaway is high, and the leaving time may be one minute or more. Since the key input for instructing the operation of the apparatus is not possible within this leaving time, the operability is deteriorated. Further, even if the operation is stopped from the normal n-fold speed operation, it is not possible to perform control to completely stop the rotation in consideration of the storage capacity of the ROM.

For example, as shown in FIG. 5, when the stop operation is performed at the time of triple speed operation (1800 rpm rotation) in the innermost part of the disk, there is a limit to the amount of tables that can be used, so that the disk cannot be completely stopped. Also, as shown in FIG.
Since the stop control at the time of runaway is left for a certain period of time, the leaving time becomes long, and there is a problem of operability such as the above key input becomes impossible.

Therefore, an object of the present invention is to eliminate the need for a memory for storing brake operation time information, to enable stable stop control, and to prevent the operability from deteriorating even when the disk goes out of control. To provide.

[0012]

In order to solve the above-mentioned problems, the disk motor control circuit of the optical disk device of the present invention performs the CLV control by the wobble signal obtained from the pre-groove information of the optical disk. In the circuit, C for generating a CLV control signal based on the wobble signal and the reference clock signal.
An FG control signal is generated based on an LV control circuit, an FG signal of a motor that rotationally drives the optical disc, and the reference clock signal, and a lock signal is generated when the rotation speed of the motor reaches a predetermined value. An FG control circuit and a stop control circuit for generating a rotation stop signal to the motor are provided, and FG control is performed by the FG control signal in response to the rotation stop instruction signal of the motor, and in response to the lock signal. It is configured to perform stop control by a rotation stop signal.

[0013]

According to the present invention, CLV control is performed by the CLV control signal generated based on the wobble signal and the reference clock signal, and when the rotation stop control of the motor is performed, the FG signal of the motor and the reference clock signal are changed. The FG control is performed based on the FG control signal generated based on the FG control signal, and the rotation stop / stop control is performed when the rotation speed of the motor that drives the optical disk reaches the predetermined value in the locked state.

[0014]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a configuration block diagram showing an embodiment of a disc motor control circuit of an optical disc device according to the present invention. In FIG. 1, components designated by the same reference numerals as those in FIG. 4 indicate components having the same function.

The CLV control section 5 outputs to the selector 7 a CLV control signal generated based on the wobble signal from the wobble detection section 4 and the reference clock signal from the reference clock generation section 6.

The stop control unit 9 receives control from the microcomputer 10 and sends a control signal of a predetermined voltage for applying a reverse brake to the motor 2 to the selector 7.

The FG control unit 11 receives the FG signal output from the motor 2 and the reference clock signal from the reference clock generation unit 6, and controls the motor as a FG error signal so that the rotation speed of the motor becomes a predetermined rotation speed. Is sent to the selector 7, and a lock signal is generated when the motor speed reaches 600 rpm, for example.

The microcomputer 10 controls the selection output of the selector 7, and during normal CLV control, the control signal from the CLV control section 5 is switched from CLV control to FG control when a stop instruction is issued, and FG control is performed. The FG control signal from the control unit 6 is output to the selector 7. The microcomputer 10 is
When the motor speed reaches 600 rpm and a lock signal is received from the FG control unit 11, the FG control is switched to the stop control, and a brake ON signal for generating a brake signal for a predetermined time is sent to the stop control unit 9, and the selector 7 Outputs a signal from the stop control unit 9 to stably stop the disk rotation.

FIG. 2 shows a sequence of the motor rotation speed in the case where the operation is stopped at the inner peripheral portion during the triple speed operation. 1800 rpm with CLV control as described above
Therefore, when the motor stop instruction is issued, the FG control is changed to 600 rpm, and the stop operation is performed at a stable timing.

FIG. 3 shows the sequence of the stopping operation from the high speed runaway, and when the runaway is 3000 rpm,
When the stop instruction is issued, the FG control is performed, and FIG.
The stop operation is performed at a stable timing of 600 rpm as in the case of. In the above description, the microcomputer 10
It is obvious that may be composed of a sequence circuit.

[0021]

As described above, the disk motor control circuit of the optical disk device according to the present invention does not need to store the time data for stopping the motor in the ROM, and the stable stopping operation can be performed. Even in the event of a runaway, quick and stable stop operation is possible without deteriorating operability. Further, since it is not necessary to store the time information in the ROM, the ROM storage capacity can be effectively utilized for other purposes.

[Brief description of drawings]

FIG. 1 is a configuration block diagram showing an embodiment of a disc motor control circuit of an optical disc device according to the present invention.

FIG. 2 is a diagram showing a sequence of motor rotation speeds in a case where a stop operation is performed in an inner peripheral portion during a triple speed operation.

FIG. 3 is a diagram showing a sequence of a stop operation after a high-speed runaway.

FIG. 4 is a configuration block diagram of a disc motor control circuit of a conventional optical disc device.

FIG. 5 is a diagram for explaining a problem of a conventional optical disc device.

FIG. 6 is a diagram for explaining a problem of a conventional optical disc device.

[Explanation of symbols]

 1 Optical Disc 2 Motor 3 Pickup 4 Wobble Detection Section 5 CLV Control Section 6 Reference Clock Generation Section 7 Selector 8 Motor Driver 9 Stop Control Section 10 Microcomputer 11 FG Control Section 12 Decoder 13 ROM

Claims (1)

[Claims] 1. A disk motor control circuit of an optical disk device for performing CLV control by a wobble signal obtained from pre-groove information of an optical disk, in which CL is controlled based on the wobble signal and a reference clock signal.
A CLV control circuit for generating a V control signal, an FG control signal based on an FG signal of a motor for rotationally driving the optical disc, and the reference clock signal, and when the rotation speed of the motor reaches a predetermined value. A FG control circuit for generating a lock signal and a stop control circuit for generating a rotation stop signal for the motor, and performing FG control by the FG control signal in response to a rotation stop instruction signal for the motor, A disc motor control circuit for an optical disc device, wherein stop control is performed by the rotation stop signal in response to a lock signal.