KR940007517B1 - Spindle motor speed control circuit for laser disk player - Google Patents

Abstract

The controller controls the rotation speed of a motor utilizing the velocity control signal of a phase control unit by horizontal synchronizing signal. The controller comprises; a detector for detecting the rotation number and phase in order to reach the desired value; a frequency controller (11) for generating velocity control signal according to the reference horizontal signal (RHS); a phase controller for generating velocity control signal; a delay unit (22) clearing the counter (21); a latch (24) for latching and outputting the counter value of a counter (21).

Description

Spindle Motor Speed Control Circuit of Laser Disc Player

1 is a circuit diagram showing the configuration of a general laser disc player.

2 is a conventional spindle motor speed control circuit diagram.

A-d of FIG. 3 is an operating waveform diagram of the frequency servo controller of FIG.

4 is an operation waveform diagram of the phase servo controller of FIG.

5 is a graph showing the change of rotational speed of the spindle motor according to the forward and reverse scanning of the forward speed borrowed laser disk.

6 is a spindle motor speed control circuit diagram of the present invention.

7A and 8A are operation waveform diagrams of respective parts of FIG. 6 in the case of performing fast scan operation in the forward and reverse directions.

* Explanation of symbols for main parts of the drawings

11: frequency servo controller 12: phase servo controller

13, 14, 25, 26: multiplexer 21: counter

22: delay 23, 24: latch

27, 28: comparator 29: Oagate

DFG: Rotation Information Signal RFG: Reference Rotation Information Signal

EHS: Regeneration horizontal registration signal RHS: Reference horizontal synchronization signal

FG +, FG-, PLL +, PLL-: Speed control signal MD +, MD-: Motor control signal

CLK: Clock Signal FAST: Maximum Speed Signal

SLOW: Lowest speed signal FWD: Forward scan signal

REV: Reverse scan signal

The present invention provides a laser disc player for reproducing information of a predetermined video signal and an audio signal recorded on a disc such as a video disc player using a laser, the laser disc player controlling a rotation speed of a spindle motor for rotating the disc. The spindle motor speed control circuit of the present invention is specifically related to the spindle motor speed control circuit. In particular, the spindle motor control mode of the spindle motor can be automatically controlled according to the rotation speed of the spindle motor to perform a stable rotation speed. The present invention relates to a spindle motor speed control circuit of a laser disc player.

In general, as shown in FIG. 1, the laser disc player is driven by a system controller 1 for controlling the operation of the entire system, and driven in accordance with a motor control signal to rotate the disc 3 and output the rotation information signal EFG. Processing of the playback information of the spindle motor 2 to be generated, the fill-up control unit 4 to reproduce the information recorded on the rotating disk 3, and the pickup information of the pickup control unit 4 A reproduction information processing unit 5 for outputting a signal, a rotation information signal EFG output from the spindle motor 2, and a reproduction horizontal synchronization signal EHS of the reproduction video signal output from the reproduction information processing unit 5; Spindle motor speed control circuit for outputting a motor control signal to the spindle motor 2 in accordance with a reference rotation information signal RFG, a reference horizontal synchronization signal RHS, and a mode signal RMD output from the system controller 1. It consists of (6). The laser disc player configured as described above rotates according to the rotational speed of the disc 3 while the skid motor 2 is driven in response to the motor control signal output from the speed control circuit 6 rather than the spindle motor. The pick-up control unit 4 controls the pickup, i.e., focus control, tracking control, tilt control, slide control, etc., on the disc 3 to generate and output the information signal EFG, and to record the disc 3 on the rotating disc 3. Accurately reproduce various types of information.

The various information reproduced by the pickup control unit 4 are processed by the reproduction information processing unit 5 under the control of the system controller 1, and are outputted as a reproduced video signal and a reproduced audio signal, and mixed with the reproduced video signal. The signal EHS is detected and input to the spindle motor speed control circuit 6, and the system controller 1 outputs the reference rotation information signal RFG, the reference horizontal synchronization signal RHS, and the mode signal RMD to the spindle. It is input to the motor speed control circuit 6.

The spindle motor speed control circuit 6 then rotates the rotation information signal EFG outputted by the spindle motor 2 and the reference rotation information signal RFG outputted by the system controller 1, and the reproduction information processing section 5 operates. Compares the reproducing horizontal synchronizing signal (EHS) and the reference horizontal synchronizing signal (RHS) outputted from the system controller (1), selects the comparison signal according to the mode signal (RMD), and transmits the Output

In such a laser disc player, the conventional spindle motor speed control circuit compares the rotation information signal EFG and the reference rotation information signal RFG with the speed control signal FG + (FG-) as shown in FIG. A phase servo controller 12 for outputting a speed control signal PLL + and PLL- by comparing the frequency servo controller 11 for outputting the PSP signal with the regeneration horizontal synchronization signal EHS and the reference horizontal synchronization signal RHS; The multiplexer 13 which selects the speed control signals FG +, FG- or PLL + according to the mode signal RMD, respectively, and outputs the motor control signals MD + and MD-, respectively. 14).

The frequency servo controller 11 connects the reference rotation information signal RFG and the rotation information signal EFG to the set terminals SE1 and SE2 of the flip-flops 11A and 11B, respectively, so that the flip-flop ( The output terminals Q1 and Q2 of the 11A) and 11B are connected to the reset terminals RE2 and RE1 of the flip-flop 11B and 11A, respectively, and the speed control signal (Q1) is output from the output terminals Q1 and Q2. The FG + (FG-) is configured to be output, respectively, and the phase servo control unit 12 has the reference horizontal synchronizing signal RHS and the reproducing horizontal synchronizing signal EHS as the set terminals SE3 of the flip-flop 12A and 12B. (SE4), and the output terminals (Q3) and (Q4) of the flip-flops (12A) and 12B are connected to the reset terminals (RE4) and (RE3) of the flip-flops (12B) and 12A, respectively. The speed control signals PLL + and PLL- are output from the output terminals Q3 and Q4, respectively.

In the conventional spindle motor speed control circuit configured as described above, the reference rotation information signal RFG is input from the system controller 1 as shown in a of FIG. 3, and is shown in b of FIG. 3 from the spindle motor 2. As described above, when the rotation information signal EFG is input, the input reference rotation information signal RFG and the rotation information signal EFG are set to the set terminals SE1 of the flip-flops 11A and 11B of the frequency servo controller 11. Is applied to SE2, and the flip-flops 11A and 11B are set respectively, and the output signals of the output terminals Q1 and Q2 are reset terminals RE2 and RE1 of the flip-flops 11B and 11A. The flip-flops 11A and 11B are output terminals Q1 and Q2, respectively, so that the reference rotation information signal RFG and the rotation information signal EFG are respectively shown in cd of FIG. The speed control signal (FG +) (FG-) is output according to the frequency of.

The reference horizontal synchronizing signal RHS is input from the system controller 1 as shown in a of FIG. 4, and the reproduction horizontal synchronizing signal EHS is shown from the reproduction information processing section 5 as shown in b of FIG. Is input, the input reference horizontal synchronizing signal RHS and reproduction horizontal synchronizing signal EHS are respectively applied to the set terminals SE3 and SE4 of the flip-flops 12A and 12B of the phase servo controller 12, respectively. Set, and the output signals of the output terminals Q3 and Q4 are applied to the reset terminals RE4 and RE3 of the flip-flop 12B and 12A, respectively, and reset, so that the outputs of the flip-flops 12A and 12B are reset. With the terminals Q3 and Q4, the speed control signals PLL + and PLL- according to the phases of the reference horizontal synchronizing signal RHS and the reproduction horizontal synchronizing signal EHS as shown in cd of FIG. do.

In this way, the speed control signals FG + (FG-) and (PLL +) (PLL-) output by the frequency servo controller 11 and the phase servo controller 12, respectively, are input terminals A1 of the multiplexers 13 and 14, respectively. The mode signal RMD is input to A2 and B1, B2, and is output from the system controller 1 to the selection terminals S1 and S2 of the multiplexers 13 and 14 so that the multiplexer ( 13 and 14 are applied to the selective output and the spindle motor 2 by the speed control signal FG + (FG-) or the speed control signal PLL + (PLL-) as the motor control signal MD + (MD-). .

In the conventional spindle motor speed control circuit, the speed control signals PLL + and PLL- output by the phase servo controller 12 at the initial stage of driving the spindle motor 2 are the motor control signals MD + and MD-. When driving the spindle motor (2) by outputting the motor controller, it takes a long time for the spindle motor (2) to rotate at a stable rotational speed and malfunctions in synchronization with the frequency of the integer multiple of the reference rotation information signal (RFG). Will occur.

Therefore, at the initial time of driving the spindle motor 2, the motor control signal is output in accordance with the mode signal RMD output by the system controller 1 to the speed control signals FG + and FG- output by the frequency servo controller 11. Speed control signal (PLL +) output by the phase servo controller 12 when the spindle motor 2 rotates at a certain stable speed by selectively outputting the output with (MD +) (MD-). The control speed of the spindle motor 2 is controlled in more detail by outputting PLL- as the motor control signals MD + and MD- according to the mode signal RMD. That is, the mode signal RMD output from the system controller 1 is a signal indicating the switching timing when the spindle motor 2 is driven at the initial speed and the normal speed, and when the spindle motor 2 is rotated at the normal speed. Next, the rotation speed of the spindle motor 2 is controlled by the speed control signals PLL + and PLL- output by the phase servo controller 12.

However, in the conventional spindle motor speed control circuit as described above, a constant angular velocity type disk has a constant rotation speed of the spindle motor when the disk is rotated and a fast scan operation is performed in the forward or reverse direction. On the other hand, in case of constant linear velocity type disc, the rotational speed of the spindle motor should be changed according to the scanning operation. However, the spindle according to the speed control signal output from the phase servo controller in the normal speed state is conventionally used. Phase servo control is performed by using unstable regenerative horizontal synchronizing signal which is reproduced while moving pickup in scan direction when scan command is input while controlling motor. Therefore, spindle motor control operation becomes unstable when fast scan operation is performed. In order to compensate for this, expand the operating range of the phase servo controller. There are problems such as the need to.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and the speed of the phase servo controller by a regeneration horizontal synchronization signal that is unstablely reproduced when a fast scan operation is performed while the disc is rotated at a normal speed. When the rotation speed of the spindle motor is controlled within an appropriate range by using the speed control signal of the frequency servo controller by the rotation information signal generated by the rotation of the spindle motor without using the control signal, and the correct scan operation is terminated. By controlling the rotational speed of the spindle motor by the speed control signal of the phase servo control unit by the regeneration horizontal synchronization signal, the burden of designing the phase servo controller to control the rotational speed of the spindle motor by the unstable regeneration horizontal synchronization signal during fast scan operation Spindle Motor Rotation Using Frequency Servo Control To provide a spindle motor speed control circuit to precisely control the degree with reference to the first figure of five degrees to 8 degrees and attach it to have a purpose to really dont described in detail, wherein the same parts as the prior art have the same reference marks.

5 is a graph showing a change in the rotational speed of the spindle motor 2 in accordance with the playback position when playing a disc of the fixed speed type. As shown in FIG. 5, the innermost speed of the fixed speed type disk is 1800 RPM (Revolution). Per Minitues) and the outermost at 600 RPM. Therefore, it is necessary to control the rotation speed of the spindle motor (2) from the minimum 600 RPM to the maximum 1800 RPM, and if the forward scan from the current position of the pickup to the target 1, the maximum rotation speed of the spindle motor (2) during the scan It should be controlled so as not to be higher than the speed (B), and also to prevent the minimum rotational speed of the spindle motor (2) from being lower than the current rotational speed (B) during the scan during the reverse scan from the current position to the neck 2 In the present invention, when the fast scan operation is performed, the rotation speed of the spindle motor 2 is controlled using the frequency servo control unit 11 as described above without using the phase servo control unit 12.

6 is a diagram of a spindle motor speed control circuit of the present invention, in accordance with the rotation information signal EFG and the reference rotation information signal RFG output from the spindle motor 2, as shown therein. A frequency servo control section 11 for generating-) and a phase servo control section 12 for generating a speed control signal PLL + (PLL-) in accordance with the regeneration horizontal synchronization signal EHS and the reference horizontal synchronization signal RHS. And a multiplexer (13) (14) for selectively outputting the speed control signals (FG +) (FG-) or (PLL +) (PLL-) as motor control signals (MD +) (MD-) according to a mode signal, and a clock signal. A counter 21 for counting CLK, a delayer 22 for clearing the counter 21 by delaying the rotation information signal EFG by one cycle of the clock signal CLK, and the counter 21 A latch 23 for storing and outputting a count value according to the rotation information signal EFG, and for storing and outputting an output signal of the latch 23 according to the control signal LTCH. The multiplexer 25 selects and outputs the output signal of the latch 23 or the maximum speed signal FAST according to the latch 24, the forward scan signal FWD, and the reverse scan signal REW. The multiplexer 26 selects and outputs the output signal of the latch 23 or the minimum speed signal SLOW, and the output signal of the multiplexer 25 is the output signal of the latch 23, and the output signal of the multiplexer 26. A comparator 27 for comparing whether it is larger than that, a comparator 28 for comparing whether it is larger than an output signal of the latch 23, and an output signal of the comparators 27, 28, and the multiplexer 13 (14). ) Is composed of an oragate 29 applied as a mode signal.

In the spindle motor speed control circuit of the present invention configured as described above, the counter 21 counts and outputs the clock signal CLK input when the fast scan operation in the forward direction is performed as shown in a of FIG.

When the rotation information signal EFG generated according to the rotation of the spindle motor 2 is input as shown in b of FIG. 7, the input rotation information signal EFG is input to the control terminal LE1 of the latch 23. Applied to the latch 23 stores the count value of the counter 21, outputs it to the latch 24 and the comparators 27 and 28, and the rotation information signal EFG is clocked through the delay 22. Since it is delayed by one period of the signal CLK and applied to the clear terminal CLR of the counter 21, the counter 21 is repeatedly cleared according to the rotation information signal EFG and counts the clock signal CLK. do.

In this state, the forward scan signal FWD is input to the selection terminal S3 of the multiplexer 25 as shown in d of FIG. 7, and the control signal LTCH as shown in e of FIG. 7. Is input to the control terminal LE2 of the latch 24, the latch 24 stores the output signal of the latch 23 and outputs to the multiplexer 25, 26, the multiplexer 25 is latched ( 24 outputs and selects the signal applied to the input port A3 to the comparator 27 as shown in f of FIG.

Then, the comparator 27 compares the magnitudes of the output signals of the latch 23 and the multiplexer 25. In this case, when performing a fast scan operation in the forward direction, the spindle motor 2 rotates at a speed faster than the reference speed so that the latch is latched. Since the value of the output signal of 23 decreases gradually, the output signal of the latch 23 is smaller than the output signal of the multiplexer 25 so that the comparator 27 outputs a high potential as shown in FIG. The output high potential is applied to the selection terminals S1 and S2 of the multiplexers 13 and 14 through the oragate 29.

Therefore, the multiplexers 13 and 14 output the speed control signals FG + and FG- output from the frequency servo control unit 11 as motor control signals MD + and MD-, so that the rotational speed of the spindle motor 2 is increased. Will be controlled.

In the case of performing the fast scan operation in the reverse direction, the input clock signal CLK is counted and output as shown in a of FIG. 8, and rotated as shown in b of FIG. In accordance with the information signal EFG, the latch 23 stores and outputs the count value of the counter 21 as shown in FIG. 8C, and delays the rotation information signal EFG. After the counter 21 is cleared according to the output signal, the counting of the clock signal CLK is repeated again. In this state, the reverse scan signal REV is input as shown in d of FIG. 8, and is applied to the selection terminal S4 of the multiplexer 26, and the control signal LTCH as shown in e of FIG. 8. Is input to the control terminal LE2 of the latch 24, the latch 24 stores the output signal of the latch 23 and outputs to the multiplexer 25, 26, the multiplexer 26 is a latch ( 24 outputs the signal inputted to the input port A4 to be selected and output to the comparator 28 as shown in FIG.

Then, the comparator 28 compares the magnitudes of the output signals of the latch 23 and the multiplexer 26. In this case, when performing a fast scan operation in the reverse direction, the spindle motor 2 rotates at a speed slower than the reference speed so that the latch is latched. Since the value of the output signal of 23 increases gradually, the output signal of the latch 23 is larger than the output signal of the multiplexer 26 so that the comparator 28 outputs a high potential as shown in FIG. The output high potential is applied to the selection terminals S1 and S2 of the multiplexers 13 and 14 through the oragate 29. Therefore, the multiplexers 13 and 14 output the speed control signals FG + and FG- output from the frequency servo control beam 11 as motor control signals MD + and MD- to rotate the spindle motor 2. To control the speed.

On the other hand, the normal regeneration operation causes the forward scan signal FWD and the reverse scan signal REV to become low potential, respectively, and the multiplexers 25 and 26 select the maximum speed signal FAST and the minimum speed signal SLOW, respectively. Therefore, when the value of the output signal of the latch 23 is equal to or higher than the maximum speed signal FAST or lower than the minimum speed signal SLOW, the comparators 27 and 28 output low potentials. ) Outputs the speed control signals FG + and FG- output from the frequency servo controller 11 as motor control signals MD + and MD- to control the rotation speed of the spindle motor 2, and the latch 23. When the value of the output signal is lower than the maximum speed signal FAST and larger than the minimum speed signal SLOW, the comparators 27 and 28 output low potentials so that the phase servo controller 12 outputs the low potential. Multiplexers 13 and 14 select and output the control signals PLL + and PLL- as motor control signals MD + and MD-, so that the rotational speed of the spindle motor 2 Controls.

As described in detail above, the present invention uses the speed control signal of the frequency servo control unit by the rotation information signal generated by the rotation of the spindle motor when performing the fast scan operation within an appropriate range. Control the rotational speed of the spindle motor with the speed control signal of the phase servo control part by the regeneration horizontal synchronization signal when the fast scan operation is terminated. The phase servo control unit rotates the spindle motor by the unstable regeneration horizontal synchronization signal during the fast scan operation. Eliminating the burden of designing to control the rotational speed of the, it is effective to accurately control the rotational speed of the spindle motor using the frequency servo controller.

Claims (1)

In the disk rotation control apparatus for detecting the number of revolutions and the phase to reach the disk rotation target value, and comparing the detected information with the target value to find the error, and variably control the drive motor speed of the disk according to the obtained error And a frequency servo control unit 11 for generating a speed control signal FG + (FG-) according to the rotation information signal EFG and the reference rotation information signal RFG output from the spindle motor 2, and a horizontal horizontal synchronization signal. A phase servo controller 12 which generates the speed control signals PLL + and PLL- according to the EHS and the reference horizontal synchronization signal RHS, and the speed control signals FG + and FG- in accordance with the mode signal. A multiplexer 13 (14) for selectively outputting (PLL +) (PLL-) as a motor control signal (MD +) (MD-), a counter (21) for counting a clock signal (CLK), and a rotation information signal (EFG). Delay delayed by one cycle of the clock signal CLK to clear the counter 21; A latch 23 for storing and outputting a count value of the counter 21 according to the rotation information signal EFG, and a latch 24 for storing and outputting an output signal of the latch 23 according to the control signal LTCH. And a multiplexer 25 for selectively outputting the output signal of the latch 24 or the maximum speed signal FAST according to the forward scan signal FWD, and the output of the latch 24 according to the reverse scan signal REV. A multiplexer 26 for selectively outputting a signal or a minimum speed signal SLOW, a comparator 27 for comparing whether the output signal of the multiplexer 25 is greater than an output signal of the latch 23, and the latch 23 ) Compares the output signal of the multiplexer 26 with the output signal of the multiplexer 26 and the output signal of the comparators 27 and 28 and applies the mode signal to the multiplexer 13 and 14 as a mode signal. Spindle motor of the laser disk player, characterized in that consisting of an oragate 29 A control circuit.