JPH09308285A - Revolution controller of discoidal storage medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform revolution control with accuracy by supplying a drive source with a signal corresponding to a first pulse input signal when a first revolution control mode is selected, and a signal geared to the pulse signal generated by a pulse generator when a second revolution control mode is selected. SOLUTION: This controller has a drive source 20 which rotates a discordal storage medium having recorded a specified pattern, and a driver 300 which supplies a drive source 20 with a revolution control signal geared to a given pulse input signal. The driver 300 supplies the drive source 20 with such a revolution control signal that the revolutionary speed of the drive source 20 becomes constan corresponding to the first given pulse input signal when the first revolution control mode is selected, and supplies it with a revolution control signal geared to the pulse signal generated by a pulse generator 200 when the second revolution control mode is selected. Hereby, the accuracy in revolution control improves.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for rotationally driving and controlling a disk-shaped storage medium, and particularly to an optical disk inspection apparatus or the like for rotationally driving and controlling an optical disk in two rotational control modes (CLV, CAV). A device suitable for application.

[0002]

2. Description of the Related Art As a rotation drive control system for a disk storage medium for inspecting a disk storage medium, for example, a system capable of selecting the following two rotation drive control modes has been proposed. . Here, as the disk-shaped storage medium, CD (compact disk), LD (laser disk), DVD (digital video disk) are used.
And the like.

First, the first rotation drive control mode is "C
"AV (Constant Angular Velocity)" mode.
This rotation drive control mode is a mode in which the rotation speed of the disk-shaped storage medium is controlled to reach the target rotation speed.

This will be described with reference to FIG. FIG.
Is a schematic diagram showing a motor for placing and rotating a disk, which is a disk-shaped storage medium, an encoder for detecting rotation information of the motor, and a disk signal detector for reading information recorded on the disk. It is a figure.

Now, assuming that B encode pulses are output when the encoder makes one rotation, assuming that the target rotation speed of the disk is r (rpm), the frequency f of the encode signal output from the encoder is It is represented by a formula.

F (Hz) = r (rpm) · B / 60 (Equation 1) Now, it is assumed that the motor is “1 / B (rotation)” by giving one pulse to a driver for rotationally controlling the motor. For example, the pulse train signal of this frequency f is given to the driver that rotationally controls the motor, and the target rotational speed is r
The CAV mode of (rpm) may be controlled.

Next, the second rotation drive control mode is "C
LV (Constant Linear Velocity) ”. In this rotational drive control mode, rotational drive control of the disk is performed so that the linear velocity (peripheral velocity) becomes constant. For example, when inspecting a disc, the disc signal detector that reproduces the signal recorded on the disc is moved in the radial direction by a moving mechanism (not shown) while the signal recorded on the disc is reproduced to perform various checks. I do. At this time, the rotational drive of the motor is controlled so that the relative velocity between the disc signal detector and the rotating disc, that is, the linear velocity (peripheral velocity) becomes constant. Depending on the distance R from the disk rotation center of, the linear velocity increases as R increases.

That is, in order to perform the CLV control, it is necessary to control the rotation of the motor at a higher rotation speed as the disk signal detector is closer to the rotation center position. Specifically, if the distance from the disk rotation center of the disk signal detector is R (m) and the linear velocity is V (m / s),
The pulse frequency f is expressed by the following equation.

F (Hz) = V (m / s) / (R (m) · 2π) (Formula 2) However, since this frequency f is the rotation frequency of the motor rotation shaft, specifically, for example, , The frequency fe of the encoded signal is “(V (m / s) · B) / (R (m) · 2π)
A pulse train signal having a frequency f such that the target linear velocity is V (m / m /
It is sufficient to control the CLV mode set as s).

A configuration example of a conventional system of a system capable of selecting such two types of rotation control modes and inspecting the disk-shaped storage medium by controlling the rotation drive of the disk-shaped storage medium is shown in FIG. 4 shows.

In this conventional apparatus, a stage 15 is mounted on a rotary shaft and a disk 10 can be placed on the stage 15, and a spindle motor 20 serving as a rotation drive source and a recording signal of a rotated disk 10 are transmitted. Signal regenerator 1 to reproduce
8, a radial direction moving mechanism 27 for moving the signal regenerator 18 in the radial direction, and a CLV control based on a distance R from the disk rotation center of the signal regenerator 18 obtained from the radial direction moving mechanism 27. CLV control pulse generation unit 40 for generating a pulse train (appropriately referred to as “peripheral speed pulse”) for performing the above, and a rotation pulse input terminal capable of inputting a pulse train for CAV control (appropriately referred to as “rotation pulse”) 45, a mode selector 25 for selecting CLV control or CAV control, a driver 30 for supplying a rotation drive control signal corresponding to a given pulse train to the spindle motor 20, and an encoding corresponding to the rotation of the spindle motor 20. The encoder 22 that outputs a signal and a check circuit that determines whether the signal reproduced by the signal regenerator 18 is normal or not. 50, if the reproduced signal does not appear normal, having a display unit 55 for display to that effect, the.
It should be noted that each of the constituent elements is publicly known, and therefore a detailed description of the constituent elements is omitted. Here, CLV and C are used.
The outline of the AV control operation will be described.

Now, it is assumed that the operator operates the mode selector 25 to select the CAV control mode. The operator inputs the pulse train of the frequency f determined by the above formula 1 so as to obtain the desired target rotation speed r (rpm) via the rotation pulse input terminal 45. Then, the driver 30 supplies a rotation drive control signal according to the given pulse train to the spindle motor 20, and the CA of the disk 10 is driven.
V control is performed. At this time, the controller changes the encode signal fed back from the encoder 22 to
A PLL control operation for locking the rotation drive control signal is performed.

At this time, the check circuit 50 determines whether the signal reproduced by the signal regenerator 18 is normal,
When the reproduced signal is not output normally, a display to that effect is displayed on the display 55. If the information stored in advance on the disc is obtained as a reproduction signal, the check circuit 50 determines that the reproduced signal is normal, and otherwise determines that it is abnormal.

The operator inputs a control signal to a control signal input section (not shown) of the radial movement mechanism 27 to move the signal regenerator 18 to a desired position and inspect the disk 10.

Next, it is assumed that the operator operates the mode selector 25 to select the CLV control mode. Then
A distance R (not shown) included in the radial movement mechanism 27
Of the CLV control pulse generator 4
Give to 0. Then, the CLV control pulse generator 40
A pulse train with a frequency f is generated so that the frequency of the encoder signal is the above-mentioned fe, and is provided to the driver 30. The driver 30 supplies a rotation drive control signal according to the given pulse train to the spindle motor 20,
CLV control is performed. At this time, the check circuit 50
It is determined whether or not the signal reproduced by the signal regenerator 18 is normal, and if the reproduced signal is not normal, a display to that effect is displayed on the display 55.

The above is the CAV or CLV in the conventional device.
It is an outline of the control operation.

[0017]

However, in the conventional apparatus as described above, when performing CLV control, R (m) is detected as the distance from the disk rotation center of the disk signal detector, It is necessary to calculate the target linear velocity based on this and generate a pulse train to be given to the driver so that the target linear velocity can be obtained, which is accompanied by the accuracy of the information of the distance R, the complexity of the circuit system and the deterioration of the calculation processing accuracy. The control accuracy was also deteriorated.

Therefore, the present invention was created in order to solve the problems of the prior art as described above, and its purpose is to provide a device capable of controlling two rotation drive of CLV and CAV. In particular, the point is to provide a means for accurately performing CLV control with a simple circuit system.

[0019]

In order to solve the above problems and achieve the object of the present invention, according to the invention of claim 1,
In a device having a drive source for rotationally driving a disk-shaped storage medium recording a signal including a signal of a predetermined pattern, and a driver for supplying a rotational drive control signal according to a given pulse input signal to the drive source, An encoder that outputs an encoded signal according to the rotation state of a drive source, a reproducing mechanism that reproduces a recording signal recorded in the disk-shaped storage medium and is movable in a radial direction, and a given first pulse input A phase difference detector for detecting a phase difference signal corresponding to a phase difference between a signal and a reproduction signal of a predetermined pattern reproduced by the reproduction mechanism, and rotation of the drive source based on the phase difference signal and the encode signal. A pulse generator that generates a pulse signal corresponding to a rotation drive control signal such that the linear velocity is constant, and one of two rotation drive control modes are selected. And a selector which drives the driver so that the rotation speed of the drive source becomes constant in response to the given first pulse input signal when the first rotation drive control mode is selected. A control signal is supplied to the drive source, and when the second rotary drive control mode is selected, a rotary drive control signal corresponding to the pulse signal generated by the pulse generator is supplied to the drive source. A rotational drive control device for a disk-shaped storage medium configured.

More specifically, a drive source for rotationally driving a disk-shaped storage medium in which a signal including a signal of a predetermined pattern is recorded, and a rotary drive control signal according to a given pulse input signal are supplied to the drive source. In a device having a driver, a encoder for outputting a signal according to a rotation state of the drive source, a reproducing mechanism for reproducing a recording signal recorded in the disk-shaped storage medium, and a reproducing mechanism movable in a radial direction, A phase difference detector for detecting a signal corresponding to the phase difference between the given first pulse input signal and the predetermined pattern reproduction signal reproduced by the reproducing mechanism, and a phase difference signal detected by the phase difference detector. A smoothing device for smoothing output, a frequency-voltage converter for converting the output signal of the encoder into a frequency and voltage and outputting the same, and an output of the smoothing device and the frequency-voltage converter are input. The driver is provided with a voltage / frequency converter that generates a voltage-frequency-converted pulse signal and a selector that selects one of two rotation drive control modes, and the first rotation drive control mode is selected by the driver. When
In response to the given first pulse input signal, a rotation drive control signal for keeping the rotation speed of the drive source constant is supplied to the drive source, and the second rotation drive control mode is selected. At this time, a rotation drive control device for a disk-shaped storage medium is provided, which is configured to supply a rotation drive control signal according to the pulse signal generated by the voltage frequency converter to the drive source.

It is also conceivable that the above-mentioned device is provided with an inspection circuit for judging whether or not the signal reproduction state of the reproduction mechanism is normal. With such a configuration, it is possible to accurately determine whether the signal reproduction state is normal.

Further, according to the present invention, the following control method is also provided. That is, it is a method of performing rotation drive control of a drive source that rotates and drives a disk-shaped storage medium that records a signal including a signal of a predetermined pattern by selecting one of two rotation drive control modes. When the rotation drive control mode is selected, the rotation drive control is performed so that the rotation speed of the drive source is constant according to the first input pulse input from the outside, and the second rotation drive control mode is selected. Sometimes, based on a phase difference signal between a second input pulse input from the outside and a reproduction signal of a predetermined pattern of a recording signal of the disk-shaped storage medium, and an encode signal according to a rotation state of the drive source, A rotation drive control method for a disk-shaped storage medium, which generates a rotation drive control signal such that a rotation linear velocity of a drive source is constant. Also according to this method, it is possible to directly read the reproduction signal and perform the rotation drive control so that the linear velocity is constant, and it is possible to perform the rotation drive control with high accuracy.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of the apparatus configuration of this embodiment.

In this apparatus, the stage 15 is mounted on the rotary shaft, and the disk 10 can be placed on the stage 15.
A spindle motor 20 which is a rotary drive source, an encoder 22 which outputs an encode signal corresponding to the rotation of the spindle motor 20, a signal regenerator 18 which regenerates a recording signal of the rotated disk 10, and a signal regenerator 18 Radial direction moving mechanism 270 that enables movement in the radial direction
And a first pulse input signal (appropriately referred to as “circumferential speed pulse”) for performing CLV control, which is given through the peripheral speed pulse terminal 46, and a reproduction signal of a predetermined pattern reproduced by the signal regenerator 18. A phase comparator 100 that detects a phase difference and outputs a phase difference signal, and a pulse that generates a pulse signal corresponding to a rotation drive control signal such that the rotation linear velocity becomes constant based on the phase difference signal and the encode signal. The generator 200, a rotation pulse input terminal 45 capable of inputting a pulse train for performing CAV control (hereinafter referred to as “rotation pulse” as appropriate), and a mode selector 25 for selecting CLV control or CAV control are provided. The driver 300 that supplies the spindle motor 20 with the rotation drive control signal corresponding to the pulse train and whether the signal reproduced by the signal regenerator 18 is normal or not can be determined. A check circuit 50 for, if the reproduced signal does not appear correctly, the display 5 for displaying to that effect
5 and. Further, the pulse generator 200 functions as a filter 210 that functions as a smoothing circuit that smoothes the phase difference signal output from the phase difference detector 100, and as a frequency / voltage conversion circuit that converts the frequency of the encode signal into a voltage value. F / V converter 220 and filter 21
0 and the output of the F / V converter 220 are input, and a V / F converter 230 having an adder that functions as a voltage frequency converter that generates a voltage-frequency converted pulse signal is provided. In the present embodiment, the signal regenerator 18
And a portion having the radial direction moving mechanism 270 constitutes a reproducing mechanism.

The components designated by the same reference numerals as those in FIG. 4 have the same configurations as those described in FIG. 4, and since most of the components are publicly known, the details of the components will be described. Although the detailed description is omitted, the phase difference detector 10
0, the pulse generator 200 will be described.

The phase difference detector 100 has a peripheral speed pulse terminal 4
The phase difference between the peripheral speed pulse (code A) given through 6 and the predetermined pattern reproduction signal (code B) by the signal regenerator 18 is detected, and the phase difference signal (code C) is output.

In order to perform such an operation, as shown in FIG.
First, as shown in, the exclusive logic sum gate (EX-O
R) detects the phase difference between the signal A and the signal B,
When a signal is input to the output signal of the second bit from the lower bit of the bit counter, Vss (for example, 5 (V))
The signal is output to the operational amplifier A that outputs the voltage of No. 2 and the operational amplifier B that outputs the voltage of “−Vss” (for example, −5 (V)) when a signal is input. When the phase of the signal B leads the phase of the signal A, the phase lead determination unit turns on the analog switch A, and
If the phase of signal A leads the phase of signal B,
The analog switch B may be configured to be turned on. As a result, the phase difference detector 100 outputs the signal B
Is positive when the phase of is ahead of the phase of signal A,
On the contrary, when the phase of the signal A leads the phase of the signal B, the output signal of the 2-bit counter having the "negative" polarity is output as the phase difference signal. The 2-bit counter is provided to thin out every other signal indicating the phase difference.

The filter 210 is, for example, a resistor R1.
Although a passive filter including a capacitor C1 and a capacitor C1 is used, an active filter including an operational amplifier, a resistor, and a capacitor may be used.
The output signal code C of the filter 210 is shown.
Further, since the F / V converter 220 is composed of a known circuit, detailed description of the structure will not be given. However, the conversion coefficient K1 is predetermined, and the frequency (f of the encode signal (code E) (f
The voltage value (V1) according to 1) is calculated as “V1 = K1 · f1”
It may be configured to output (reference numeral F) so that

Further, the adder connects the negative feedback resistor R3 to the operational amplifier C, further connects the resistor R2 to the inverting terminal, and guides the output signal of the F / V converter 220 to the non-inverting terminal. Is connected to the resistor R, the resistor R for guiding the output signal of the filter 210, and the resistor R for connecting to the ground point.

Then, the adder outputs the addition result of the signal D and the signal F to the V / F converter 230 as a signal G. Further, since the F / V converter 220 is configured by a known circuit such as a voltage controlled oscillator circuit (VCO), detailed description of the configuration will not be given. However, the conversion coefficient K2 is predetermined and the voltage value of the signal G is set. Output a signal of frequency (f2) corresponding to (V2) so that "V2 = K2.f2" (reference H)
It should be configured to do so.

Next, the operation of this apparatus will be described with reference to FIG. Now, it is assumed that the operator operates the mode selector 25 to select the CAV control mode. The operator inputs the pulse train of the frequency f determined by the above formula 1 so as to obtain the desired target rotation speed r (rpm) via the rotation pulse input terminal 45. The rotation pulse may be supplied by operating a pulse generator such as a pulse generator.

Then, the driver 300 sends a rotation drive control signal corresponding to the given pulse train to the spindle motor 2
0 for CAV control of the disk 10. In addition,
At this time, the controller performs a PLL control operation that locks the encode signal fed back from the encoder 22 to the rotation drive control signal.

At this time, the check circuit 50 determines whether the signal reproduced by the signal regenerator 18 is normal,
When the reproduced signal is not output normally, a display to that effect is displayed on the display 55. If the information stored in advance on the disc is obtained as a reproduction signal, the check circuit 50 determines that the reproduced signal is normal, and otherwise determines that it is abnormal.

The operator inputs a control signal to a control signal input section (not shown) of the radial movement mechanism 27 to move the signal regenerator 18 to a desired position and inspect the disk 10.

Next, it is assumed that the operator operates the mode selector 25 to select the CLV control mode. Here, it is assumed that a signal corresponding to the signal B functioning as a synchronization signal for CLV control is previously recorded as a signal of a predetermined pattern on each track of the disk 10, for example, a signal of a predetermined number of bits. The signal of the predetermined pattern may be configured in columns. Further, since this is a known technique, detailed description thereof will be omitted, but the signal B
Is provided with a synchronization signal detection circuit for detecting and outputting only a signal corresponding to. That is, the synchronization signal detection circuit gives the signal B to the phase difference detector 100. Of course, necessary information including a predetermined pattern signal is recorded.

The operation will be described separately for a first case where the phase of the signal B leads the phase of the signal A and a second case where the phase of the signal A leads the phase of the signal B. First, an operation timing chart of each signal in the first case is shown in FIG.

The operator operates the radial direction moving mechanism 27.
A control signal is applied to a movement control unit (not shown) included in the signal reproduction unit 18 to set the distance R from the disc center of the signal regenerator 18.
Then, in consideration of the distance R, the operator gives a peripheral speed pulse having a frequency f so that the frequency of the encoder signal becomes the above-mentioned fe through the peripheral speed pulse input terminal 46.
The peripheral speed pulse may be supplied by operating a pulse generator such as a pulse generator.

Now, the phase of the signal of the peripheral speed pulse A is behind the phase of the signal B reproduced by the signal regenerator 18, which is a synchronizing signal, and the frequencies of the signals A and B are f0, Let f1. These signals are input to the EX-OR gate and the phase lead determination unit of the phase difference detector 100. The EX-OR gate performs an exclusive logical operation on the signals A and B, and inputs the front-back phase difference signal to the 2-bit counter. The second terminal from the lower bit of the 2-bit counter outputs a signal obtained by thinning out the front-rear phase difference signals one by one, and since the phase of the signal B leads the phase of the signal A, the analog switch A is turned on. In this state, the signal C, which is a positive output pulse from the operational amplifier A, is output. Then, the filter 210 smoothes the signal C and outputs the signal D. This voltage value is “a1”.

On the other hand, the encode signal E output from the encoder 22 in response to the rotation of the spindle motor 20, that is, the rotation of the disk, is frequency / voltage converted by the F / V converter 220, and the signal F of the voltage value "b" is obtained. Becomes Then, the adder adds the voltage values of the signal D and the signal F and outputs the signal G of the voltage value “c1 (a1 + b)”.

Further, the V / F converter 230 supplies the pulse signal H having a frequency corresponding to the voltage of the signal G to the driver. In this case, the frequency of the signal H is f3, and the frequency f
Since the frequency is greater than 0, the spindle motor 22 is driven and the CLV control of the disk 10 is performed so as to cancel the delayed phase difference.

The signal G is a control deviation amount for performing CLV control so that the target linear velocity is obtained with respect to the signal F corresponding to the encode signal E, which is a signal indicating the current disk rotation speed. . Therefore, it becomes possible to perform CLV control so that the target linear velocity is achieved. Therefore,
The conversion coefficient K2 of the V / F converter 230 is a pulse train (signal H) such that when the signal G is input, the driver 300 supplies the spindle motor 20 with a rotation drive control signal corresponding to the given peripheral speed pulse. May be preset while considering the output characteristics of the conversion coefficient K1 of the filter 210 and the F / V converter 220. Regarding the conversion coefficients K1 and K2, in principle, "K1 = K"
2 "is further set so that the voltage signal is not saturated in a circuit manner at the maximum rotation.

Next, the operation in the second case will be described with reference to the operation timing chart of each signal with reference to FIG. First, the operator gives a control signal to a movement control unit (not shown) included in the radial movement mechanism 27 to set the distance R from the disc center of the signal regenerator 18.

Then, in consideration of the distance R, the operator gives a peripheral speed pulse of frequency f via the peripheral speed pulse input terminal 46 so that the frequency of the encoder signal becomes the above-mentioned fe. The peripheral speed pulse may be supplied by operating a pulse generator such as a pulse generator.

Now, the phase of the signal of the peripheral velocity pulse A leads the phase of the signal B reproduced by the signal regenerator 18, which is a synchronizing signal, and the frequencies of the signals A and B are f0, f2. It should be noted that the number of rotations of the disc is the same as that in the first case, and therefore the encode signal is the same. Now, these signals A and B are input to the EX-OR gate and the phase lead determination unit of the phase difference detector 100. The EX-OR gate performs an exclusive logical operation on the signals A and B, and inputs the front-back phase difference signal to the 2-bit counter. The second terminal from the lower bit of the 2-bit counter outputs a signal obtained by thinning out the front-back phase difference signals one by one, and since the phase of the signal A leads the phase of the signal B, the analog switch B is turned on. Then, the signal C, which is a negative output pulse from the operational amplifier B, is output. Then, the filter 210 smoothes the signal C and outputs the signal D. This voltage value is “a2”. Unlike the first case, the voltage value “a2” has a negative value.

On the other hand, the encode signal E output from the encoder 22 according to the rotation of the spindle motor 20, that is, the rotation of the disk is frequency-voltage converted by the F / V converter 220, and the signal F having the voltage value "b" is obtained. Becomes Then, the adder adds the voltage values of the signal D and the signal F and outputs the signal G of the voltage value “c1 (a1 + b)”.

Further, the V / F converter 230 supplies the pulse signal H having a frequency corresponding to the voltage of the signal G to the driver. In this case, the frequency of the signal H is f4. Since the voltage value "c1" is smaller than the voltage value "c2", the frequency f4 is voltage-frequency converted so that the frequency f4 is a frequency smaller than the frequency f0, which is different from the first case.

Since the frequency f4 is smaller than the frequency f0, the spindle motor 22 is driven so as to cancel the advanced phase difference, and the CLV control of the disk 10 is performed.

Also in this case, the signal G is CLV control for controlling the signal F corresponding to the encode signal E, which is a signal indicating the current disk rotation speed, so as to attain the target linear velocity. It is the control deviation amount. Therefore, it becomes possible to perform CLV control so that the target linear velocity is achieved.

The check circuit 50 is used for the signal regenerator 1.
8 determines whether the reproduced signal is normal, and if the reproduced signal is not normal, a display to that effect is displayed on the display unit 5.
5 is displayed. As a result, a highly accurate inspection can be performed.

Disks to be inspected by this apparatus include disk-shaped storage media such as optical disks such as CD (compact disk), LD (laser disk) and DVD (digital video disk). .

As described above, in the present invention, 2
A method of performing rotational drive control of a drive source for rotationally driving a disk-shaped storage medium recording a signal including a signal of a predetermined pattern by selecting one of the two rotational drive control modes,
When the first rotation drive control mode (CAV) is selected, the rotation drive control is performed so that the rotation speed of the drive source becomes constant according to the first input pulse (rotation pulse) input from the outside.

The second rotation drive control mode (CL
When V) is selected, the phase difference signal between the second input pulse (peripheral speed pulse) input from the outside and the reproduction signal of the predetermined pattern of the recording signal of the disk-shaped storage medium, and the rotation state of the drive source are selected. On the basis of the corresponding encode signal, a rotation drive control signal that makes the rotation linear velocity of the drive source constant is generated. Therefore, in order to perform the CLV control so as to achieve the target linear velocity, the control deviation amount that is added or subtracted from the encode signal, which is a signal indicating the current disk rotation speed, is generated from the phase difference signal, and the control deviation amount is added or subtracted. Since the CLV control is performed so that the target linear velocity is achieved, the rotation drive control can be performed with high accuracy.

[0053]

As described above, according to the first aspect of the invention, the phase difference between the first pulse input signal given by the phase difference detector and the predetermined pattern reproduction signal reproduced by the reproducing mechanism is obtained. The pulse generator detects the phase difference signal corresponding to the pulse generator, and the pulse generator generates the pulse signal corresponding to the rotation drive control signal such that the rotation linear velocity of the drive source becomes constant, based on the phase difference signal and the encode signal. Therefore, the rotation drive control can be performed so that the linear velocity is constant by directly reading the reproduction signal, and the accuracy of the rotation drive control is improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a configuration example of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a timing chart of each signal.

FIG. 3 is an explanatory diagram of frequencies of a peripheral speed pulse and a rotation pulse.

FIG. 4 is a configuration diagram of a conventional device.

FIG. 5 is a configuration diagram of a main circuit system according to the embodiment of the present invention.

[Explanation of symbols]

 10 disk 15 stage 18 signal regenerator 20 spindle motor 22 encoder 25 mode selector 27 radial direction moving mechanism 30 driver 40 CLV control pulse generator 45 rotation pulse input terminal 46 peripheral speed pulse input terminal 50 check circuit 55 indicator 100 phase difference Detector 200 Pulse generator 210 Filter 220 F / V converter 230 V / F converter 300 Driver

Claims (1)

[Claims] 1. A drive source for rotationally driving a disk-shaped storage medium on which a signal including a signal of a predetermined pattern is recorded, and a driver for supplying a rotational drive control signal according to a given pulse input signal to the drive source. In an apparatus having, an encoder that outputs an encode signal according to a rotation state of the drive source, and a reproducing mechanism that reproduces a recording signal recorded in the disk-shaped storage medium and is movable in a radial direction are provided. A phase difference detector that detects a phase difference signal according to the phase difference between the first pulse input signal and the predetermined pattern reproduction signal reproduced by the reproduction mechanism; and based on the phase difference signal and the encode signal, A pulse generator that generates a pulse signal corresponding to a rotation drive control signal that keeps the rotation linear velocity of the drive source constant, and one of two rotation drive control modes. And a selector for selecting either Re, the driver, when the first rotation drive control mode is selected, in response to the first pulse input signal applied,
A rotation drive control signal that keeps the rotation speed of the drive source constant is supplied to the drive source, and when the second rotation drive control mode is selected, the pulse generator generates a pulse signal according to the pulse signal generated by the pulse generator. A rotation drive control device for a disk-shaped storage medium, which is configured to supply a rotation drive control signal to the drive source.