JPH08293155A - Optical disk reproducing method and optical disk driving device - Google Patents

Abstract

PURPOSE: To shorten access time and to reduce power consumption by enabling reading data before a rotational speed control is completed. CONSTITUTION: In the period from time when an actuator reaches the target track being in an access operation to time when the rotational speed of a spindle motor 203 reaches the prescribed rotational speed at the time of a normal reproducing, a frequency control signal is generated from the position of the actuator and the rotational speed of the spindle motor and then a vaiable reference clock is generated by making a frequency variable oscillator 208 oscillate. After a data readout is started, the rotational speed of the spindle motor 203 is made to be changed until it becomes equal to a fixed master clock by gradually correcting the variable reference clock within the change range of frequencies calculated from the rotational speed of the spindle motor 203 and a capture range. Thus, the synchronization of the range exceeding the frequency pull-in range of a PLL circuit is made possible and the waiting time of a reproducing is made to be eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk reproducing method and an optical disk drive device for driving and controlling an optical disk recording medium.

[0002]

2. Description of the Related Art In recent years, technological innovation in the information processing field has been rapidly progressing, and accordingly, a large-capacity storage medium has become indispensable. Under such circumstances, the optical disk storage medium has been attracting attention as a small-sized, low-cost, large-capacity storage medium.

FIG. 12 is a block diagram of a conventional optical disk drive device. In FIG. 12, 101 is an optical disk storage medium capable of recording about 500 Mbytes of data with a constant surface density. An actuator 102 is composed of an optical unit for reading data from the optical disk storage medium 101 and a driving device for the optical unit. A spindle motor 103 rotates the optical disk storage medium 101.
A servo circuit 104 performs servo control of the drive device of the actuator 102 and servo control of rotating the spindle motor 103 at a constant linear velocity. A signal processing circuit 105 demodulates a signal obtained by the optical unit of the actuator 102, corrects an error, and outputs data. 1
A central processing circuit (CPU) 06 controls the entire optical disk drive device.

An operation of the conventional optical disk drive device having the above-described structure during continuous reproduction and access will be described.

During continuous reproduction, the servo circuit 104 controls the focus direction (see arrow F in the figure) and the track direction (see arrow T in the figure) of the actuator 102 so that the optical unit in the actuator 102 is placed in the optical disc storage medium 101. To follow the track. At the same time, servo circuit 1
Reference numeral 04 controls the rotation speed of the spindle motor 103 so that the linear velocity becomes constant in order to read the data of the optical disk storage medium 101 recorded at the constant surface density.
The signal thus obtained from the optical unit in the actuator 102 is demodulated by the signal processing circuit 105,
The error is corrected and converted into a digital signal.

On the other hand, at the time of access (seek operation), a short jump that moves only the optical unit in the actuator 102 and a long jump that moves together with the actuator 102 are distinguished depending on the number of tracks to be moved.

The short jump can be performed in a relatively short time because the mass of the optical unit is small and the change amount of the spindle rotation speed is minute. However, the long jump requires a considerably long time to complete the movement because the mass of the actuator 102 is large and the amount of change in the spindle rotation speed is large.

Therefore, in order to realize the high speed operation of the optical disk drive device (in particular, the information retrieval device), it is necessary to shorten the time required to complete the movement at the time of accessing the long jump.

[0009]

Analysis of the contents of the time required to complete the movement shows that even if the movement of the actuator is completed, it takes time to complete the rotation speed control of the spindle motor. Waiting without being able to read the data recorded in. That is, a waiting time occurs until the track of the optical disk has a constant linear velocity.

Further, in order to reduce the time required for controlling the rotation speed of the spindle motor, the torque of the spindle motor must be increased, which leads to an increase in the size of the motor and an increase in power consumption. The above problems have been unavoidable, especially when increasing the transfer rate such as a 4 × speed drive device.

[0011]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to read data before the rotation speed control of the spindle motor is completed at the time of access. It is an object of the present invention to shorten the time and accordingly reduce the power consumption associated with the acceleration / deceleration control of the spindle motor.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION In the first embodiment of the present invention, a spindle motor for rotating an optical disk,
Rotation speed detection means for detecting the rotation speed of the spindle motor, an actuator for movably supporting the optical lens and the optical pickup in the focus direction and the tracking direction, and a fixed main clock signal that is the basis for signal processing An optical disk drive device comprising: a basic clock generating unit for controlling a rotation speed of a spindle motor; and a variable reference clock generating unit for generating a variable reference clock whose oscillation frequency is changed by a frequency control signal, A digital PLL circuit that controls the rotation speed of the spindle motor to synchronize with a predetermined clock signal, and the spindle motor is forcibly driven during the access operation of the actuator, and the spindle motor rotates after reaching the target track during the access operation. Where the speed is during normal playback With the period up to the rotational speed to generate a frequency control signal from the actuator position and the spindle motor rotational speed, CPU for controlling each section
And

With the above configuration, the optical disk drive device according to the present invention uses the variable reference clock as the PLL reference clock signal of the digital signal processing circuit and the digital PLL circuit, so that the frequency greatly exceeds the frequency pull-in range of the PLL circuit. It became possible to synchronize the range and read the data of the optical disk storage medium at an arbitrary reproduction speed. After the data reading is started, in order to keep the data transfer rate constant at a predetermined rate, the variable reference clock is corrected stepwise within the frequency change range calculated from the rotation speed of the spindle motor and the capture range. , Change until equal to fixed master clock. Therefore, it is possible to eliminate the reproduction waiting time until the rotation speed of the spindle motor at the time of access reaches a constant linear speed at the time of reproduction.

In the second embodiment of the present invention, a photoelectric conversion means for irradiating a disk surface with laser light to convert reflected light into an electric signal, and an output signal of the photoelectric conversion means are amplified so that the laser light The focus is controlled to a predetermined track position, the data on the disk is read out, and the signal processing means for controlling the rotation of the drive means for rotationally driving the disk, and the read data are temporarily stored and processed to an external device. An optical disk device having a central processing unit for performing data transfer processing and controlling each processing step, comprising variable frequency oscillating means for outputting a clock signal of an arbitrary frequency under the control of the central processing unit, The above-mentioned signal processing means is operated based on the clock signal of the oscillating means.

With the above structure, when seeking is performed on an arbitrary address on the disc recorded at a constant linear velocity, the clock signal of the variable frequency oscillating means is changed according to the direction of the disc to be sought. By operating the signal processing means based on the clock signal, it is possible to read data from the disk, perform signal processing, and transfer the data to an external device before the rotation of the disk reaches a predetermined linear velocity.

Therefore, even if the seek is performed, it is not necessary to wait until the disk reaches a predetermined linear velocity, and high-speed seek can be realized. Also, if you start reading data with a clock signal that is slower than the predetermined clock signal,
Since the amount of data insufficient for the predetermined data transfer amount is stored in the buffer memory in advance, it is possible to always secure the data transfer amount equal to or larger than the predetermined data transfer amount. Further, in both the first and second embodiments described above, the time required for accelerating and decelerating the spindle motor can be shortened, so that it is possible to suppress the current value flowing in the spindle motor and reduce the power consumption.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A first embodiment of the present invention will be described with reference to FIGS. 1 is a block diagram of an optical disk drive device according to a first embodiment of the present invention, FIG. 2 is a block diagram showing in detail the components relating to frequency variable read control in the device of FIG. 1, and FIG. 3 shows the operation during a long jump. It is a flowchart.

In FIG. 1, 201 is an optical disk capable of recording about 500 Mbytes of data with a constant surface density. An actuator 202 is composed of an optical unit for reading the data of the optical disc 201 and a drive device thereof. Optical disc 201 from the optical unit
An RF signal is obtained as a reproduction signal of. A spindle motor 203 rotates the optical disc 201 at a constant linear velocity. A servo circuit 204 performs servo control of the drive device of the actuator 202 and servo control of the spindle motor 203. A signal processing circuit 205 demodulates the reproduced signal obtained by the optical unit of the actuator 202 and corrects the error, and outputs the data. Reference numeral 206 denotes a central processing circuit (hereinafter abbreviated as CPU), which not only controls the entire system, but also forcibly drives the spindle motor 203 during the access operation of the actuator 202 to reach the target track during the access operation and then the spindle. During the period until the rotation speed of the motor 203 reaches the rotation speed at the time of normal reproduction, the VCO (Voltage Controlled) is calculated from the position of the actuator 202 and the rotation speed of the spindle motor 203.
Oscillator) Control signal C1 is generated. A rotation speed detection circuit 207 detects the rotation speed of the spindle motor 203 and converts it into a rotation speed detection signal. 208 is a VCO
The (variable frequency oscillator) outputs a variable reference clock C2 whose oscillation frequency changes according to the VCO control signal C1 from the CPU 206.

FIG. 2 is a block diagram showing in detail components relating to frequency variable read control in the optical disk drive device of FIG. In FIG. 2, the same components as those in FIG. 1 are designated by the same reference numerals, and duplicate description will be omitted. 211 is a digital PLL (Phase Locked Loo)
In the circuit p), the signal processing clock C5 to be controlled is generated so that the data stream included in the reproduction signal is synchronized with the PLL reference clock C4 to be the reference. 212
Is a spindle control circuit, which controls the rotation speed of the spindle motor 203 based on the signal processing clock C5. Two
An actuator drive circuit 13 receives an actuator drive signal from the CPU 206 and outputs the actuator 2
02 operation is controlled. When FIG. 2 is compared with FIG. 1, the digital PLL circuit 211, the spindle control circuit 212, and the actuator drive circuit 213 are included in the servo circuit 204.

The operation of the optical disc drive apparatus according to the first embodiment of the present invention configured as above will be described. First, during continuous data reproduction, the servo circuit 204 controls the focus direction and the track direction of the actuator 202 so that the optical unit in the actuator 202 follows the track of the optical disc 201.

At the same time, the servo circuit 204 reads the data of the optical disc 201 recorded with a constant surface density so that the spindle motor 20 has a constant linear velocity.
Control the rotation speed of 3. The rotation speed control of the spindle motor 203 during continuous data reproduction is performed only by the servo circuit 204, and the oscillation frequency of the VCO 208 is kept constant to keep the transfer rate constant. In this way, the reproduction signal obtained from the optical unit in the actuator 202 is
The signal processing circuit 205 performs demodulation and error correction, and converts the digital signal. The above operation is the same as that of the conventional optical disk drive device, and the description of the operation is also the same.

Next, the data access can be roughly divided into a short jump and a long jump. The short jump ends in a short time because the amount of change in the rotation speed of the spindle motor 203 is minute. Therefore, the operation is similar to that at the time of reproducing the continuous data.

On the other hand, in the long jump, since the change in the rotation speed of the spindle motor 203 is large, the VCO2
The oscillation frequency of 08 is changed according to the reproduction signal, and the waiting time for reading data for establishing the rotation speed of the spindle motor 203 is reduced to achieve high speed.

FIG. 3 is a flow chart showing the operation at the time of a long jump. The operation at the time of this long jump access will be described with reference to FIGS. 2 and 3.

First, the CPU 206 calculates the target track and the target spindle rotation speed from the address of the data to be accessed (S1).

Next, the CPU 206 temporarily turns off the actuator servo and the spindle servo, and forcibly drives the actuator 202 (S2) and the spindle motor 203 (S3). Therefore, the actuator 2
02 starts moving (S4), and the spindle motor 203
Starts acceleration or deceleration (S5).

The CPU 206 monitors arrival at the target track as the actuator 202 moves (S6),
If not reached, steps 4 to 6 are continued.

When the target track is reached, the CPU 20
6 switches the control of the actuator 202 from forced drive to servo control (S7). At the same time, the CPU 206
Switches the signal source of the PLL reference clock signal C4 to the variable reference clock C2 and outputs the VCO control signal C1 to the VCO 208 (S8). Further, the control of the spindle motor 203 is switched from the forced drive signal to the spindle control circuit 212 (S9).

Explaining the control contents of steps 7 to 9 and the actual behavior of the optical disk drive apparatus, the optical disk drive apparatus is where the actuator 202 has moved to the vicinity of the target track, and the spindle motor 203 is at the position of the corresponding track. Is in the process of accelerating or decelerating toward the predetermined linear velocity.

Therefore, the CPU 206 previously calculates the frequency (data rate) of the reproduction signal which is estimated to be obtained from the actuator 202 based on the position of the actuator 202 and the rotation speed of the spindle motor 203, and the calculated frequency. The VCO control signal C1 corresponding to is output. The VCO 208 oscillates at a frequency corresponding to the VCO control signal C1 and outputs the variable reference clock C2.

As a result, although the spindle motor 203 has not reached the predetermined linear velocity at the position of the corresponding track, the digital PLL circuit 211 outputs the signal processing clock C5 in synchronization with the new variable reference clock C2. To do.

Therefore, the spindle control circuit 212, the spindle motor 203, the actuator drive circuit 213,
Actuator 202 and digital PLL circuit 21
The spindle control system servo circuit consisting of 1 is a digital P
The data of the optical disc 201 can be read by synchronizing with the reproduction signal in the frequency range that greatly exceeds the frequency pull-in range (capture range) of the LL circuit 211.

In this way, the number of error tracks for the moving target track is calculated from the read address (S1
0), a short jump is performed until the target track is reached (S11 and S12). Therefore, the data can be read and the data transfer can be started without waiting until the rotation speed control of the spindle motor 203 is completed (S
13).

However, at this stage, although the access by the long jump is completed, the spindle motor 203 is accelerating or decelerating toward the predetermined linear velocity,
In order to keep the data transfer rate constant at a predetermined rate, the variable reference clock C2 is changed until it becomes equal to the fixed master clock C3 (S14). In this case, the frequency change range is changed stepwise within the frequency change range calculated from the rotation speed of the spindle motor 203 and the capture range.

Thus, the variable reference clock C2 is changed step by step until the variable reference clock C2 becomes equal to the fixed master clock C3 (S14 to S15), and when both clocks become equal, the signal of the PLL reference clock C4 is changed. Switch source to fixed master clock C3 (S1
6) The access operation is completed and the normal reproduction mode is resumed.

Next, the loop characteristics of each servo system when the reproduction speed is changed will be verified. In the first embodiment of the present invention, a digital servo using a digital filter is used,
The problem is solved by dividing the sampling clock from the signal processing clock C5 and creating it. Therefore, a method of correcting the loop characteristic of the servo system by changing the reproduction speed will be described with reference to the loop characteristic diagram.

FIG. 4 is a block diagram of the servo circuits of the tracking control system and the focus control system. In FIG. 4, the portions surrounded by the dotted lines respectively constitute a digital filter and an analog filter. Further, as described above, the sampling clock of the digital filter is obtained by dividing the signal processing clock C5 in FIG. FIG. 5 shows a loop characteristic diagram of the analog filter in FIG.
Represents a loop characteristic diagram of the digital filter in FIG.

The general expression of the loop characteristic of the digital filter is expressed by a transfer function H (z), and z = exp (jωt) = exp (j · 2π (f / fs)) (where f: frequency, fs: Sampling frequency), the loop characteristics can be shifted in the frequency axis direction by changing the sampling frequency.

FIG. 7 shows a desirable loop characteristic diagram. Therefore, if the loop characteristic (FIG. 5) of the analog filter is corrected, the stable loop characteristic (FIG. 7) can be obtained in a wide range from low speed to high speed by changing the sampling frequency of the digital filter. it can. That is, by synchronizing the digital servo reference clock with the signal processing clock, stable loop characteristics can be always realized even when the reproduction speed is changed (that is, the PLL reference clock C4 is changed). .

The servo characteristics of the tracking control system and the focus control system described above are the same as those of the optical disc 20.
A response in the high frequency region is required in response to one rotation (for example, eccentricity). However, for the spindle servo, on the other hand, the loop characteristics in the low frequency region can be adequately supported (the loop gain in the high frequency region is not necessary because it only changes the rotation speed slowly), so the tracking control system and focus control system It does not require verification of frequency characteristics such as servo characteristics.

As described above, according to the first embodiment of the present invention, the data on the optical disk can be read at an arbitrary reproduction speed. As a result, the waiting time for establishing the rotation speed of the spindle motor at the time of long jump can be used for data reading, and the access time can be shortened.

Further, since it is not necessary to perform rapid acceleration or deceleration control of the spindle motor, the spindle motor can be downsized and the power consumption can be reduced.

Next, a second embodiment of the present invention will be described. FIG. 8 is a block diagram of an optical disk device according to the second embodiment of the present invention. In FIG. 8, the optical disk 301 is irradiated with the laser emitted by the light emitting element. Three
Reference numeral 02 denotes a pickup unit, which is an optical disc 30.
It has an optical system for converting the reflected light from 1 into an electric signal. The RF amplifier 303 is the pickup unit 30.
The RF signal obtained from 2 is amplified. Reference numeral 305 denotes a digital signal processor (hereinafter abbreviated as DSP) that controls reading of data, and controls the focus of the laser output from the pickup unit 302 to a predetermined track position based on the output signal of the RF amplifier 303. In addition, the rotation speed of the spindle motor 304 for rotating the optical disc 301 to a data readable speed is controlled to read the data reproduced from the optical disc 301.

The driver 306 drives the pickup unit 302 and the spindle motor 304 by the output signal of the DSP 305. The ROM decoder 308 is a DS
The signal output from P305 is decoded and stored in the buffer memory 307. Interface controller 30
9 performs arbitration with the information read internally and transfers data in accordance with an instruction from a host computer connected to the outside. The central processing unit 310 (hereinafter abbreviated as CPU) includes an RF amplifier 303 and a DSP 30.
5 and the ROM decoder 308 and the interface controller 309.

311 is a variable frequency oscillating means, which outputs a clock signal of an arbitrary frequency under the control of the CPU 310. The above-mentioned DSP 305 uses the clock signal output from the variable frequency oscillating means 311 as a reference clock for calculation.

Here, the details of the variable frequency oscillating means 311 will be described. FIG. 9 is a circuit block diagram of the variable frequency oscillator 311 of FIG. In FIG. 9, a phase loop locked (PLL) circuit is configured as a whole by the following component blocks (note that the variable frequency oscillating means 311 described above is included in the DSP 305 in terms of the circuit configuration). In some cases).

The oscillation circuit 401 oscillates at a predetermined frequency,
It outputs the basic clock signal fck. The N divider circuit 402 divides the basic clock signal fck, which is the output of the oscillator circuit 401, by N (a constant set value set in the circuit).

On the other hand, the M division circuit 404 can rewrite the value of M of the M division by the CPU 310, and divides the output signal from the VCO 403 described later by M. The phase comparison circuit 405 detects and outputs the phase difference between both signals output from the N frequency dividing circuit 402 and the M frequency dividing circuit 404. Low-pass filter (hereinafter abbreviated as LPF) 4
Reference numeral 06 shapes the waveform of the output signal of the phase comparison circuit 405 and outputs it as a voltage signal. VCO403 is LPF406
It oscillates at a frequency that has changed according to the output signal from and outputs a clock signal (fvco).

Next, the operation of the variable frequency oscillating means 311 constructed as above will be described. First, in a steady state, a clock frequency (fck / N) obtained by dividing the frequency (fck) of the basic clock signal by N and a clock frequency (fvco / M) obtained by dividing the frequency fvco of the output signal from the VCO 403 by M are given. , The whole P to have the same period
Since the LL circuit works, if the value of M is set to the same as N, f
The VCO 403 oscillates so that vco = fck.

It is also assumed that the value of M is a times N (M =
a ・ N) and fvco = a ・ fck, the CPU
By changing M to the desired value by 310,
A clock signal having an arbitrary oscillation frequency can be obtained.

Further, paying attention to the operation of the DSP 305, since the output signal of the variable frequency oscillating means 311 is used as the reference clock, the characteristics also change in proportion to the frequency of the reference clock. That is, the data transfer rate Vda
The relationship between ta and fvco is Vdata = b · fvc
o (b is a constant determined by data processing).

Further, in the actual operation when reading the optical disc 301 recorded at a constant linear velocity (v = constant), the radius r of the optical disc 301 at the position where the pickup unit 302 exists and the current rotation speed n. Since the relationship of v = 2πrn / 60, n = 60v / (2
πr) can be derived. Therefore, the outer peripheral side (rou
When seeking from t) to the inner circumference side (rin),
The relationship between the rotational speeds nout and nin is that the radius r is rout
Since> rin, the number of rotations is not <nin.

The seek operation and the data transfer rate will be described based on the above description of the operation. First, the seek operation from the outer peripheral side to the inner peripheral side will be described. FIG. 10 is a timing chart of the seek operation from the outer circumference side to the inner circumference side of the optical disk device in the second embodiment. At the time of seek operation from the outer circumference side to the inner circumference side, at the same time as starting the seek operation,
The CPU 310 controls the M value of the M frequency dividing circuit 404 to be smaller than the N value. Therefore, the variable frequency oscillator 3
11 is a frequency lower than the reference clock frequency fck (fv
It oscillates in the co-down) and outputs the reference clock signal of this frequency.

As described above, since the overall characteristic also changes in proportion, the processing is started at the rotation speed lower than the predetermined rotation speed and the slow data transfer speed. Therefore, conventionally, address reference and data reading were impossible until the number of rotations of the optical disk 301 increased to a predetermined number of rotations nin.
As shown in the rotation speed of FIG. 10, address reference and data reading can be performed at a rotation speed nin-down that is lower than the rotation speed nin.

Next, when data reading is started, CP
The value of M of the M divider 404 is controlled by U310 to change the reference clock frequency from fvco-down to fc.
By changing the frequency almost linearly up to k, the data transfer is not interrupted between the data transfer rate Vdata-down and Vdata, and the data transfer can be enabled after the access (data transfer in FIG. 10). See speed).

However, in the above method, since the initial speed of data reading is slow, the following control is performed in order to ensure a constant data transfer speed. At the data transfer rate of FIG. 10, the area S2 corresponding to the data of the portion where the data transfer amount is insufficient and the read data are stored in the buffer memory 3
Buffering is performed so that the area S1 of the data transfer amount stored in 07 becomes the same area, and the data transfer is started when S1 becomes larger than S2.

FIG. 11 is a timing chart of the seek operation from the inner circumference side to the outer circumference side of the optical disk device in this embodiment. When seeking from the inner side to the outer side, CP
The value of M of the M frequency dividing circuit 404 is controlled to be larger than the value of N by U310. Therefore, the variable frequency oscillator 311
Is higher than the reference clock frequency fck (fvco
-Up), and outputs a new reference clock signal.

As described above, since the overall characteristics also change in proportion, the processing is started at a high rotation speed and a high data transfer rate. Therefore, as shown in the rotation speed of FIG. 11, conventionally, the optical disk 30 has a predetermined (regular) rotation speed nout.
The address reference and the data read were impossible until the rotation speed of 1 decreased, but the address reference and the data read can be performed at the rotation speed nout-up higher than the rotation speed nout.

Next, when data reading is started, CP
U 310 controls the value of M of the M divider 404 to change the reference clock frequency from fvco-up to fck almost linearly, thereby making it possible to secure a steady data transfer rate after access. You can Since the seek from the inner circumference side to the outer circumference side does not lower than the predetermined data transfer rate, it is not necessary to perform buffering or the like.

Although the reading method for performing the buffering has been described by using the second embodiment, the use of the buffer memory 307 is not limited to the second embodiment, and the same applies to the first embodiment. It is needless to repeat the description that the read control can be performed.

[0061]

As described above, according to the present invention, when performing a seek to an arbitrary address, the reference clock is changed in the inner peripheral direction and the outer peripheral direction of the seek to start the data read, so that the spindle motor is accelerated / decelerated. The time is short, and the value of the current flowing to the spindle motor can be suppressed. In addition, since the insufficient amount of data when the data is read at a frequency slower than the reference clock is stored in the buffer memory, it is possible to always ensure a data transfer amount that is equal to or greater than a predetermined data transfer amount, and It was possible to realize thinner, thinner, low power consumption, and high-speed seek.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an optical disk drive device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing in detail components related to frequency variable read control in the apparatus of FIG.

FIG. 3 is a flowchart showing an operation during a long jump.

FIG. 4 is a block diagram of a servo circuit of a tracking control system and a focus control system.

5 is a loop characteristic diagram of the analog filter in FIG.

6 is a loop characteristic diagram of the digital filter in FIG.

FIG. 7: Desired loop characteristic diagram

FIG. 8 is a block diagram of an optical disk device according to a second embodiment of the present invention.

9 is a circuit block diagram of the variable frequency oscillating means of FIG.

FIG. 10 is a timing chart of a seek operation from the outer circumference side to the inner circumference side of the optical disc device in the second embodiment.

FIG. 11 is a timing chart of a seek operation from the inner circumference side to the outer circumference side of the optical disc device in the present embodiment.

FIG. 12 is a block diagram of a conventional optical disk drive device.

[Explanation of symbols]

 101 optical disk recording medium 102,202 actuator 103,203,304 spindle motor 104,204 servo circuit 105,205 signal processing circuit 106,206 central processing circuit (CPU) 201,301 optical disk 207 rotational speed detection circuit 208,403 frequency variable detection Circuit (VOC) 211 Digital PLL circuit 212 Spindle control circuit 213 Actuator drive circuit 302 Pickup unit 303 RF amplifier 305 Digital signal processor (DSP) 306 Driver 307 Buffer memory 308 ROM recorder 309 Face controller 310 Central processing unit (CPU) 311 Variable Frequency oscillation means 401 Oscillation circuit 402 N division circuit 404 M division circuit 405 Phase comparison circuit 406 L F

Claims (14)

[Claims] 1. A spindle control step of detecting a rotation speed of a driving means for rotating an optical disk and controlling the driving means so as to attain a predetermined rotation speed, and irradiating a disk surface with a laser beam to electrically generate a reflected light. An optical disc reproducing method comprising: a signal processing step of converting the signal into an RF signal and outputting an RF signal; and a servo control step of servo-controlling the driving means based on the RF signal, wherein a variable reference clock with an oscillation frequency changed And a PLL control step of synchronizing the rotation of the driving means with a predetermined clock signal, and by using the variable reference clock for the predetermined clock signal. An optical disk reproducing method characterized by reproducing data of an optical disk at a rotation speed. 2. A drive means (spindle motor) for rotationally driving an optical disc, a rotation detection means for detecting a rotation speed of the drive means, and the rotation detection so that the rotation speed of the drive means becomes a predetermined rotation speed. A spindle control means for controlling the driving means based on the means, a photoelectric conversion means including an optical lens and an optical pickup for irradiating a disk surface with laser light and converting reflected light into an electric signal, and the photoelectric conversion means. Actuator means for movably supporting in the focus direction and the tracking direction, signal processing means for amplifying an output signal of the photoelectric conversion means and outputting an RF signal, and the actuator means and the spindle control based on the RF signal. An optical disc having servo control means for servo-controlling the means and control means for controlling the operation of the entire apparatus. And a frequency variable oscillating means for generating a variable reference clock with an oscillated frequency changed, and a PLL means for controlling the rotation of the driving means in synchronization with a predetermined clock signal. An optical disk drive device, wherein the means reads the data of the optical disk at an arbitrary rotation speed of the driving means by using the variable reference clock as the predetermined clock signal. 3. A spindle control step of detecting a rotational speed of a driving means for rotationally driving an optical disc and controlling the driving means so as to attain a predetermined rotational speed, and irradiating a disc surface with a laser beam to electrically generate reflected light. An optical disc reproducing method comprising: a signal processing step of converting the signal into a signal and outputting an RF signal; and a servo control step of servo-controlling the driving means based on the RF signal, wherein an arbitrary frequency according to the rotation speed. Variable frequency oscillating step of outputting the clock signal of, and a step of synchronizing the rotation of the driving means with the clock signal of the arbitrary frequency, the signal processing step means based on the clock signal of the arbitrary frequency. An optical disk reproducing method characterized by executing. 4. A drive means for rotationally driving an optical disc, a rotation detection means for detecting a rotation speed of the drive means, and a rotation detection means for controlling the rotation speed of the drive means to a predetermined rotation speed. Spindle control means for controlling the driving means, photoelectric conversion means composed of an optical lens and an optical pickup for irradiating a disk surface with laser light and converting reflected light into an electric signal, and the photoelectric conversion means for focusing direction and tracking. Actuator means for movably supporting in a direction, signal processing means for amplifying an output signal of the photoelectric conversion means and outputting an RF signal, and servoing the actuator means and the spindle control means based on the RF signal. An optical disk drive device having a servo control means for controlling and a control means for controlling the operation of the entire device. A variable frequency oscillating means for outputting a clock signal of an arbitrary frequency according to the rotation speed by the control means, and a PLL means for controlling the rotation of the driving means to be synchronized with the clock signal of the arbitrary frequency. The optical disk device, wherein the control means operates the signal processing means based on the clock signal of the arbitrary frequency. 5. A spindle control step of detecting the rotational speed of a drive means for rotating the optical disk and controlling the drive means so as to attain a predetermined rotational speed, and irradiating the disk surface with laser light to generate reflected light electrically. A signal processing step of converting into a signal and outputting an RF signal; an actuator moving step of supporting a photoelectric conversion means for converting reflected light into an electric signal so as to be movable in a focus direction and a tracking direction; and based on the RF signal, An optical disk reproducing method comprising: a servo control step of servo-controlling a driving means, wherein a frequency variable oscillation step of generating a variable reference clock with an oscillating frequency changed; and rotation of the driving means synchronized with a predetermined clock signal. PLL control step, in the actuator moving step, access movement During the period from the start of the rotation until the rotation speed reaches a predetermined rotation speed during normal reproduction, the variable reference clock is used for the predetermined clock signal, so that the data of the optical disk is read at an arbitrary rotation speed of the drive means. A method for reproducing an optical disk, characterized in that 6. A drive means for rotationally driving an optical disk, a rotation detection means for detecting a rotation speed of the drive means, and a rotation detection means based on the rotation detection means so that the rotation speed of the drive means becomes a predetermined rotation speed. Spindle control means for controlling the driving means, photoelectric conversion means composed of an optical lens and an optical pickup for irradiating a disk surface with laser light and converting reflected light into an electric signal, and the photoelectric conversion means for focusing direction and tracking. Servo control of the actuator means and the spindle control means based on the RF signal and the signal processing means for amplifying the output signal of the photoelectric conversion means and outputting the RF signal. An optical disk drive device having a servo control means for controlling the operation of the device and a control means for controlling the operation of the entire device. A variable frequency oscillating means for generating a variable reference clock calculated based on the rotational speed and the position of the photoelectric conversion means; and a PLL means for controlling the rotation of the driving means in synchronization with a predetermined clock signal, The control means uses the calculated variable reference clock as the predetermined clock signal in a period from the start of the access operation of the actuator means until the rotation speed reaches a predetermined rotation speed during normal reproduction. Thus, the optical disk drive device reads the data of the optical disk before the rotation speed of the drive means is controlled to a predetermined rotation speed. 7. A spindle control step of detecting the rotational speed of a drive means for rotationally driving an optical disk and controlling the drive means so as to attain a predetermined rotational speed, and irradiating the disk surface with laser light to generate reflected light electrically. A signal processing step of converting into a signal and outputting an RF signal; an actuator moving step of supporting a photoelectric conversion means for converting reflected light into an electric signal so as to be movable in a focus direction and a tracking direction; and based on the RF signal, An optical disk reproducing method comprising: a servo control step of servo-controlling a driving means, wherein a variable frequency oscillating step of outputting a clock signal of an arbitrary frequency according to the rotation speed, and a rotation of the driving means by the arbitrary frequency. Synchronizing with the clock signal of, in the actuator moving step, An optical disk, wherein the signal processing step means is executed based on a clock signal of the arbitrary frequency during a period from the start of the access operation until the rotation speed reaches a predetermined rotation speed during normal reproduction. How to play. 8. A drive means for rotationally driving an optical disk, a rotation detection means for detecting a rotation speed of the drive means, and a rotation detection means for controlling the rotation speed of the drive means to a predetermined rotation speed. Spindle control means for controlling the driving means, photoelectric conversion means composed of an optical lens and an optical pickup for irradiating a disk surface with laser light and converting reflected light into an electric signal, and the photoelectric conversion means for focusing direction and tracking. Actuator means for movably moving in a direction, signal processing means for amplifying an output signal of the photoelectric conversion means and outputting an RF signal, and servoing the actuator means and the spindle control means based on the RF signal. An optical disk drive device having a servo control means for controlling and a control means for controlling the operation of the entire device. And a variable frequency oscillating means for outputting a clock signal of an arbitrary frequency according to the rotation speed by the control means, and a PLL means for controlling the rotation of the driving means to be synchronized with the clock signal of the arbitrary frequency. In the period from the start of the access operation of the actuator means until the rotation speed reaches a predetermined rotation speed during normal reproduction, the control means performs the signal processing based on the clock signal of the arbitrary frequency. An optical disk device, characterized in that the data of the optical disk is read before the rotation speed of the drive means is controlled to a predetermined rotation speed by operating the means. 9. A spindle control step of detecting the rotational speed of a drive means for rotationally driving an optical disk and controlling the drive means so as to attain a predetermined rotational speed, and irradiating the disk surface with a laser beam to generate reflected light electrically. A signal processing step of converting into a signal and outputting an RF signal; an actuator moving step of supporting a photoelectric conversion means for converting reflected light into an electric signal so as to be movable in a focus direction and a tracking direction; and based on the RF signal, An optical disk reproducing method comprising: a servo control step of servo-controlling a driving means, wherein a fixed main clock generating step of generating a fixed main clock signal used in the signal processing step, and a variable reference clock with an oscillated frequency changed. Frequency variable oscillating step for synchronizing the rotation of the driving means with a predetermined clock signal. In the actuator moving step, the variable reference clock is set to the predetermined clock during the period from the start of the access operation until the rotation speed reaches a predetermined rotation speed during normal reproduction. By using the signal, the reading of the optical disk data is started before the rotation speed of the drive means is controlled to a predetermined rotation speed, and after the data reading is started, the fixed main clock signal and the calculated value are calculated. An optical disk reproducing method, characterized in that the calculated variable reference clock is changed stepwise within the capture range of the PLL means until the variable reference clock becomes equal. 10. A drive means for rotating and driving an optical disk, a rotation detection means for detecting a rotation speed of the drive means, and a rotation detection means for controlling the rotation speed of the drive means to a predetermined rotation speed. Spindle control means for controlling the driving means, photoelectric conversion means composed of an optical lens and an optical pickup for irradiating a disk surface with laser light and converting reflected light into an electric signal, and the photoelectric conversion means for focusing direction and tracking. Servo control of the actuator means and the spindle control means based on the RF signal and the signal processing means for amplifying the output signal of the photoelectric conversion means and outputting the RF signal. It is an optical disk drive device that has a servo control unit that controls the entire device and a control unit that controls the operation of the entire device. A fixed main clock signal that serves as a basis for processing the output signal of the photoelectric conversion unit, and a frequency variable oscillation unit that generates a variable reference clock calculated based on the position of the rotation speed and the photoelectric conversion unit, PLL means for controlling the rotation of the drive means in synchronization with a predetermined clock signal, wherein the control means has a predetermined rotation speed during normal reproduction after the actuator means starts an access operation. By using the calculated variable reference clock as the predetermined clock signal during the period until the speed is reached, the reading of the data on the optical disc is started before the rotation speed of the drive means is controlled to the predetermined rotation speed. , After the data reading is started, until the fixed main clock signal becomes equal to the calculated variable reference clock. An optical disk drive device characterized in that the calculated variable reference clock is changed stepwise within a capture range of the PLL means. 11. A drive means for rotationally driving an optical disk, a rotation detection means for detecting a rotation speed of the drive means, and a rotation detection means for controlling the rotation speed of the drive means to a predetermined rotation speed. Spindle control means for controlling the driving means, photoelectric conversion means composed of an optical lens and an optical pickup for irradiating a disk surface with laser light and converting reflected light into an electric signal, and the photoelectric conversion means for focusing direction and tracking. Servo control of the actuator means and the spindle control means based on the RF signal and the signal processing means for amplifying the output signal of the photoelectric conversion means and outputting the RF signal. It is an optical disk drive device that has a servo control unit that controls the entire device and a control unit that controls the operation of the entire device. A fixed main clock signal that serves as a basis for processing the output signal of the photoelectric conversion unit, and a frequency variable oscillation unit that generates a variable reference clock calculated based on the position of the rotation speed and the photoelectric conversion unit, The control means includes a PLL means for controlling the rotation of the drive means to be synchronized with a predetermined clock signal, and a buffer means for temporarily storing the read data, and the control means is such that the actuator means starts an access operation. After the rotation speed reaches the predetermined rotation speed during the normal reproduction, the calculated variable reference clock is used as the predetermined clock signal to set the rotation speed of the drive unit to the predetermined rotation speed. Start reading the data on the optical disk before the control is completed, and after starting reading the data, the fixed main clock Until the signal and the calculated variable reference clock become equal, the calculated variable reference clock is changed stepwise within the capture range of the PLL means, and the actuator means moves from the outer peripheral side to the inner peripheral side of the optical disc. The optical disk drive device is characterized in that, when is moved, the read data is stored in the buffer means and the data is transferred to an external device when a predetermined data storage amount is reached. 12. A spindle control step of detecting a rotational speed of a driving means and controlling the rotational speed to a predetermined rotational speed, irradiating a disk surface with laser light, converting reflected light into an electric signal, and outputting an RF signal. A signal processing step; an actuator moving step for supporting a photoelectric conversion means for converting reflected light into an electric signal so as to be movable in a focus direction and a tracking direction; and a servo control step for servo-controlling the driving means based on the RF signal. An optical disc reproducing method including: a variable frequency oscillation step of outputting a clock signal of an arbitrary frequency according to the rotation speed; and a step of synchronizing the rotation of the driving means with the clock signal of the arbitrary frequency. Then, in the actuator moving step, the rotation speed after the access operation is started. During the period until reaching the predetermined rotation speed during normal reproduction, the rotation speed of the driving means is controlled to the predetermined rotation speed by executing the signal processing step means based on the clock signal of the arbitrary frequency. Before starting the reading of the data on the optical disk, after the reading of the data is started, the clock signal of the arbitrary frequency is linearly changed to the clock signal of the frequency corresponding to the predetermined rotation speed during normal reproduction. An optical disk reproducing method characterized by the above. 13. A drive means for rotating and driving an optical disk, a rotation detection means for detecting a rotation speed of the drive means, and a rotation detection means for controlling the rotation speed of the drive means to a predetermined rotation speed. Spindle control means for controlling the driving means, photoelectric conversion means composed of an optical lens and an optical pickup for irradiating a disk surface with laser light and converting reflected light into an electric signal, and the photoelectric conversion means for focusing direction and tracking. Actuator means for movably moving in a direction, signal processing means for amplifying an output signal of the photoelectric conversion means and outputting an RF signal, and servoing the actuator means and the spindle control means based on the RF signal. An optical disk drive device having a servo control means for controlling and a control means for controlling the operation of the entire device. A variable frequency oscillating means for outputting a clock signal of an arbitrary frequency according to the rotation speed by the control means, and a PLL means for controlling the rotation of the driving means to be synchronized with the clock signal of the arbitrary frequency. The control means has a period from the start of the access operation of the actuator means until the rotation speed reaches a predetermined rotation speed during normal reproduction, based on the clock signal of the arbitrary frequency. By operating the signal processing means, the reading of the data on the optical disc is started before the rotation speed of the driving means is completely controlled to the predetermined rotation speed, and after the reading of the data is started, the clock of the arbitrary frequency is set. An optical disc in which a signal is linearly changed into a clock signal having a frequency corresponding to a predetermined rotation speed during normal reproduction. Live equipment. 14. A drive means for rotationally driving an optical disc, a rotation detection means for detecting a rotation speed of the drive means, and a rotation detection means based on the rotation detection means so that the rotation speed of the drive means becomes a predetermined rotation speed. Spindle control means for controlling the driving means, photoelectric conversion means composed of an optical lens and an optical pickup for irradiating a disk surface with laser light and converting reflected light into an electric signal, and the photoelectric conversion means for focusing direction and tracking. Actuator means for movably moving in a direction, signal processing means for amplifying an output signal of the photoelectric conversion means and outputting an RF signal, and servoing the actuator means and the spindle control means based on the RF signal. An optical disk drive device having a servo control means for controlling and a control means for controlling the operation of the entire device. A variable frequency oscillating means for outputting a clock signal of an arbitrary frequency according to the rotation speed by the control means, and a PLL means for controlling the rotation of the driving means to be synchronized with the clock signal of the arbitrary frequency. And a buffer unit for temporarily storing the read data, wherein the control unit is a period from the start of the access operation of the actuator unit until the rotation speed reaches a predetermined rotation speed during normal reproduction. Operates the signal processing means based on the clock signal of the arbitrary frequency to start reading the data of the optical disc before the completion of controlling the rotation speed of the driving means to a predetermined rotation speed. After the reading is started, the clock signal of the arbitrary frequency is clocked with the frequency corresponding to the predetermined rotation speed during normal reproduction. When the actuator means is moved from the outer circumference side to the inner circumference side of the optical disk, the data that has started reading is stored in the buffer means, and when the predetermined data storage amount is reached, An optical disk drive device characterized by transferring data to the device.