JPH10241266A - Optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten access time by changing the frequency of a clock for reproduction generated by a clock generating circuit to a low or high frequency at the time of moving an optical head to another zone and demodulating data based on the changed clock for reproduction. SOLUTION: When the seeking of an optical head is completed and the head is made on to tracks of the innermost zone, a CPU outputs a kick pulse enable signal to a kick pulse generating circuit 51. The current of a constan current source 46 is guided to an adder 44 by allowing a changeover switch 49 to be turned on according to a kick pulse. The frequency of a clock signal to be outputted from a VCO 45 is made to be lowered by a frequency equivalent to one % of the frequency every time the kick pulse is outputted. Then, when the phase of the clock to be outputted from the VCO 45 and phase of the binary signal from a binary circuit coincide with each other and a PLL lock detection signal becomes an H level, the kick enable signal becomes an L level. Thus, a reproduced signal is quickly processed by performing a reproducing processing before the revolving speed of a disk is stablized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk apparatus for reproducing data recorded on an optical disk composed of a plurality of zones, for example, a plurality of tracks, by rotating at a different number of revolutions for each zone. About.

[0002]

2. Description of the Related Art In recent years, an optical disc has been divided into a plurality of zones consisting of a plurality of tracks in the radial direction, and the number of sectors per track has been the same for each zone. The numbers are different. When recording data on an optical disk or reproducing recorded data, the optical disk is rotated at a different number of revolutions for each zone to record data or reproduce recorded data by an optical head. It is supposed to do. The optical head moves in the radial direction of the optical disk to record data on a predetermined track or to reproduce recorded data.

[0003] The number of rotations gradually decreases from the inside to the outside of the optical disk. In such an optical disc device, when reproducing data, the number of rotations of the zone where reproduction is performed has reached, and the data cannot be reproduced unless the rotation is stabilized. That is, mechanically, it took time for the rotation to stabilize.

[0004]

As described above, in the case where data is reproduced by rotating at different rotational speeds for each zone, when the data is reproduced, the rotational speed of the zone to be reproduced is increased. This eliminates the disadvantage that data cannot be reproduced unless the rotation is stabilized and access time is required. When moving to a desired zone, the rotation speed of the zone is reached. It is an object of the present invention to provide an optical disk device that can perform a reproducing operation even before the rotation speed is not stable and can shorten an access time when reproducing data.

[0005]

An optical disk apparatus according to the present invention has a recording track on which data is recorded spirally or concentrically, and reproduces data from an optical disk comprising a plurality of zones of recording tracks. ,
An optical head for reproducing data from the optical disk; rotating means for rotating the optical disk at a different number of revolutions for each zone; and moving the optical head to a predetermined zone by moving the optical head in a radial direction of the optical disk. Moving means, storage means for storing speed data corresponding to the number of rotations of each zone of the optical disc, and moving the optical head by the moving means to perform reproduction in another zone, Reading means for reading out speed data corresponding to the data from the storage means, first processing means for rotating the rotating means with the speed data read out by the reading means, and reproduction on the basis of reproduction data reproduced by the optical head. Generating means for generating a clock for use in reproduction by the optical head based on a clock for reproduction generated by the generating means. Demodulating means for demodulating reproduced data to be reproduced, and when moving to another zone on the optical disk, changing the frequency of a reproducing clock generated by the generating means to a lower or higher frequency, and reproducing the changed frequency. And a second processing means for demodulating the reproduction data reproduced by the optical head based on the clock of the above by the demodulation means.

An optical disk apparatus according to the present invention has a recording track on which data is recorded spirally or concentrically, and reproduces data from an optical disk composed of a plurality of recording track zones. An optical head for reproducing data, a rotating means for rotating the optical disc at a different number of revolutions for each zone, a moving means for moving the optical head to a predetermined zone by moving the optical head in a radial direction of the optical disc, and the optical disc Storage means for storing speed data corresponding to the number of rotations of each zone, when the optical head is moved by the moving means to perform reproduction in another zone, speed data corresponding to the destination zone Reading means for reading the data from the storage means, and rotating the rotating means with the speed data read by the reading means. First processing means, generating means for generating a reproduction clock based on reproduction data reproduced by the optical head, reproduction by the optical head based on the reproduction clock generated by the generation means. Demodulating means for demodulating the reproduction data, and when moving from the inner zone to the outer zone of the optical disc, lower the frequency of the reproducing clock generated by the generating means, The reproduction data reproduced by the optical head is demodulated by the demodulation means on the basis of the frequency of the reproduction clock generated by the generation means when moving from the outer zone to the inner zone of the optical disk. And a second demodulating means for demodulating the reproduction data reproduced by the optical head based on the reproduction clock by the demodulation means. And a processing unit.

An optical disk device according to the present invention has a recording track on which data is recorded spirally or concentrically, and reproduces data from an optical disk comprising a plurality of recording track zones. An optical head for reproducing data, a rotating means for rotating the optical disc at a different number of revolutions for each zone, a moving means for moving the optical head to a predetermined zone by moving the optical head in a radial direction of the optical disc, and the optical disc Storage means for storing speed data corresponding to the number of rotations of each zone, when the optical head is moved by the moving means to perform reproduction in another zone, speed data corresponding to the destination zone Reading means for reading the data from the storage means, and rotating the rotating means with the speed data read by the reading means. First processing means, generating means for generating a reproduction clock based on reproduction data reproduced by the optical head, reproduction by the optical head based on the reproduction clock generated by the generation means. Demodulation means for demodulating the reproduction data, first and second constant current sources for generating constant currents having different directions, and a reproduction clock generated by the generation means after the movement of the optical head is started are locked. Generating means for sequentially generating a kick pulse until the optical disk moves from the inner zone to the outer zone.
When the current from the constant current source is selected and moved from the outer zone to the inner zone of the optical disc, the second
Selecting means for selecting the current from the constant current source, and outputting the current from the first or second constant current source selected by the selecting means for the time of the kick pulse generated by the generating means. Means, and adding the current output by the output means to the generation means,
When moving from the inner zone to the outer zone of the optical disk, the frequency of the reproduction clock generated by the generation means is lowered, and the optical head reproduces the data based on the reproduction clock. When the reproduction data is demodulated by the demodulation means and moves from the outer zone to the inner zone of the optical disk, the frequency of the reproduction clock generated by the generation means is increased, and the reproduction clock is increased. And a second processing means for demodulating the reproduction data reproduced by the optical head based on the above.

An optical disk apparatus according to the present invention has a recording track on which data is recorded in a spiral or concentric manner, and records data on an optical disk composed of a plurality of recording track zones, or records data on the optical disk. In reproducing data, an optical head for recording and reproducing data on and from the optical disk, rotating means for rotating the optical disk at a different number of revolutions for each zone, and moving the optical head in a radial direction of the optical disk Means for moving the optical head to a predetermined zone, a storage means for storing speed data corresponding to the number of rotations of each zone of the optical disc, and moving the optical head by the moving means for reproduction in another zone. Reading means for reading the speed data corresponding to the destination zone from the storage means. First processing means for rotating the rotating means with the speed data read by the stage, generating means for generating a clock for reproduction based on the reproduced data reproduced by the optical head, and reproduction generated by the generating means Demodulating means for demodulating the reproduction data reproduced by the optical head based on the clock for reproduction, and lowering the frequency of the reproduction clock generated by the generation means when moving to another zone on the optical disk. And a second processing unit for demodulating the reproduction data reproduced by the optical head by the demodulation unit based on the reproduction clock having the changed frequency.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an optical disk device. This optical disk device is an optical disk 1
The recording of data or the reproduction of recorded data is performed using focused light.

The optical disk 1 is formed by coating a metal film layer of tellurium or bismuth in a donut shape on a surface of a substrate formed in a circular shape of, for example, glass or plastics, and forming concentric or spiral grooves. This is a phase change type rewritable disc in which data is recorded or recorded data is reproduced using both lands, and address data is recorded at predetermined intervals by recording marks in a mastering step.

As shown in FIG. 2, the optical disc 1
A plurality of zones 1a composed of a plurality of tracks in the radial direction,
It is divided into ... The clock signal for each zone 1a is the same, and the rotation speed (speed) of the optical disc 1 for each zone 1a is different (slower from the inner circumference to the outer circumference). The number of sectors in one track differs for each zone 1a,. The relationship between the speed data as the number of revolutions for each of the zones 1a,... And the number of sectors per track is recorded in the table 2a of the memory 2 as shown in FIG.

On the tracks of the respective zones 1a,... Of the optical disk 1, headers 1 ₁ ,... On which addresses and the like are recorded are preformatted in advance for each sector.

In FIG. 1, the optical disk 1 is rotated by a motor 3 at a different rotation speed for each zone, for example. The motor 3 is controlled by a motor control circuit 4. Recording and reproduction of data on the optical disk 1 are performed by the optical head 5. The optical head 5 is
The linear motor 6 is fixed to a drive coil 7 constituting a movable portion, and the drive coil 7 is connected to a linear motor control circuit 8.

A speed detector 9 is connected to the linear motor control circuit 8, and the optical head 5 detected by the speed detector 9
Is sent to the linear motor control circuit 8. A permanent magnet (not shown) is provided at a fixed portion of the linear motor 6. When the drive coil 7 is excited by the linear motor control circuit 8, the optical head 5 is moved in the radial direction of the optical disc 1.

The optical head 5 is provided with an objective lens 10 supported by a wire or a leaf spring (not shown). The objective lens 10 can be moved in the focusing direction (the direction of the optical axis of the lens) by driving the drive coil 11, and can be moved in the tracking direction (the direction orthogonal to the optical axis of the lens) by driving the drive coil 12. Is possible.

A laser light beam is emitted from the semiconductor laser oscillator 9 by drive control of the laser control circuit 13.
The laser control circuit 13 includes a modulation circuit 14 and a laser drive circuit 15, and operates in synchronization with a recording clock signal supplied from a recording PLL circuit (not shown). The modulation circuit 14 modulates the recording data supplied from the error correction circuit 32 into a signal suitable for recording, that is, 8-16 modulated data. The laser drive circuit 15 receives the 8-
The semiconductor laser oscillator (or argon neon laser oscillator) 19 is driven according to the 16 modulation data.

PLL (Phase Locked Loop) circuit 16
Outputs a reproduction clock signal in response to a control signal (frequency direction setting signal, kick pulse enable signal) from the CPU 30 and a binarization signal from the binarization circuit 18a of the data reproduction circuit 18 during reproduction. .

A laser light beam emitted from a semiconductor laser oscillator 19 is irradiated on the optical disk 1 via a collimator lens 20, a half prism 21, and an objective lens 10. The reflected light from the optical disc 1
0, a half prism 21, a condenser lens 22, and a cylindrical lens 23, and are guided to a photodetector 24.

The photodetector 24 includes a four-divided photodetector cell 24.
a, 24b, 24c, and 24d. The output signal of the photodetector cell 24a is supplied to one end of the adder 26a via the amplifier 25a. The output signal of the light detection cell 24b is supplied to one end of an adder 26b via an amplifier 25b. The output signal of the light detection cell 24c is
5c is supplied to the other end of the adder 26a. The output signal of the light detection cell 24d is supplied to the other end of the adder 26b via the amplifier 25d.

Further, the output signal of the light detection cell 24a is:
The signal is supplied to one end of the adder 26c via the amplifier 25a. The output signal of the light detection cell 24b is supplied to one end of an adder 26d via an amplifier 25b. Photodetection cell 24
The output signal of c is supplied to the other end of the adder 26d via the amplifier 25c. The output signal of the light detection cell 24d is supplied to the other end of the adder 26c via the amplifier 25d.

The output signal of the adder 26a is a differential amplifier OP
2, and the output signal of the adder 26b is supplied to the non-inverting input terminal of the differential amplifier OP. The differential amplifier OP2 outputs a signal related to the focus point according to the difference between the two output signals of the adders 26a and 26b. This output is supplied to the focusing control circuit 27. The output signal of the focusing control circuit 27 is supplied to the focusing drive coil 12. Thus, the laser light beam is controlled to be always just focused on the optical disc 1.

The output signal of the adder 26c is a differential amplifier OP
1, and the output signal of the adder 26d is supplied to the non-inverting input terminal of the differential amplifier OP1. The differential amplifier OP1 outputs a track difference signal according to the difference between the two output signals of the adders 26c and 26d. This output is supplied to the tracking control circuit 28. The tracking control circuit 28 creates a track drive signal according to the track difference signal from the differential amplifier OP1.

The track drive signal output from the tracking control circuit 28 is applied to the drive coil 1 in the tracking direction.
1 is supplied. Further, a track difference signal used in the tracking control circuit 28 is supplied to the linear motor control circuit 8.

By performing the focusing and tracking, each of the light detecting cells 24a, 24a,
... the sum signal of the output signals of 24d,
The change in the reflectance from the pits (recording data) formed on the track is reflected in the output signal of the adder 26e, which is the addition of the two output signals c and 26d. This signal is supplied to the data reproducing circuit 18. Data reproduction circuit 18
Reproduces recorded data based on a reproduction clock signal from the PLL circuit 16.

The data reproducing circuit 18 includes an adder 26
e has a binarization circuit 18a for binarizing the output signal of e, and demodulates the binary signal based on a clock signal for reproduction from the PLL circuit 16 (inverse conversion of 8-16 modulation).
And reproduce the data. The binarized signal from the binarizing circuit 18a in the data reproducing circuit 18 is a PLL.
It is supplied to the circuit 16.

The reproduced data of the data reproducing circuit 18 is transferred to the bus 2
9 is supplied to the error correction circuit 32. The error correction circuit 32 outputs an error correction code (EC
C) to correct the error, or add an error correction code (ECC) to the recording data supplied from the interface circuit 35 and output it to the memory 2.

The reproduced data whose error is corrected by the error correction circuit 32 is transmitted to the bus 29 and the interface circuit 3.
5 is supplied to an optical disk control device 36 as an external device. The recording data emitted from the optical disk control device 36 is transmitted to the interface circuit 35 and the bus 29.
Is supplied to the error correction circuit 32 via the.

When the objective lens 10 is moved by the tracking control circuit 28, the linear motor 6, that is, the optical head 5 is moved by the linear motor control circuit 8 so that the objective lens 10 is located near the center position in the optical head 5. Be moved.

The D / A converter 31 includes a focusing control circuit 27, a tracking control circuit 28, a linear motor control circuit 8, and a CPU 30 for controlling the entire optical disk apparatus.
Used to transfer data between and.

The motor control circuit 4, the linear motor control circuit 8, the laser control circuit 15, the PLL circuit 16, the data reproduction circuit 18, the focusing control circuit 27, the tracking control circuit 28, the error correction circuit 32 and the like are connected via a bus 29. It is controlled by the CPU 30. The CPU 30 performs a predetermined operation according to a program recorded in the memory 2.

As shown in FIG. 4, the PLL circuit 16 includes a phase comparator 41, a charge pump 42, an integrator 43, an adder 44, a voltage controlled oscillator (VCO: voltage control oscillator) 45, a constant current source 46, 47, changeover switches 48, 49, 50, kick pulse generation circuit 5
1 and a PLL lock detection circuit 52.

The phase comparator 41 is a lock-in type phase comparator.
8a from binary signal (reproduction signal) and voltage controlled oscillator 4
5 and outputs a signal having a pulse width proportional to the compared phase difference. The signal from the phase comparator 41 is output to the charge pump 42 and the PLL lock detection circuit 52.

The charge pump 42 generates a signal having a voltage value corresponding to a signal having a pulse width proportional to the phase difference from the phase comparator 41. The signal from the charge pump 42 is output to the adder 44.

The integrator 43 removes harmonics of the signal from the charge pump 42. The charge pump 42 and the integrator 43 constitute a smoothing filter unit.

The adder 44 is provided between the charge pump 42 and the integrator 43 so as to add a constant current corresponding to the kick pulse. The current is added, or the constant current on the negative side from the constant current source 47 is added.

The voltage controlled oscillator 45 outputs a binary clock signal having a frequency proportional to the voltage (analog value) of the signal from the adder 44. The clock signal of the voltage controlled oscillator 45 is output to the phase comparator 41,
The data is output to the data reproducing circuit 18.

The constant current source 46 is a circuit for outputting a positive constant current, and the constant current source 47 is a circuit for outputting a negative constant current. The output of the constant current source 46 and the output of the constant current source 47 are supplied to a changeover switch 48.

The changeover switch 48 is switched in response to a frequency direction setting signal supplied from the CPU 30. When the frequency direction setting signal is at a high level, the switch is switched to the constant current source 46 side, and the frequency direction setting signal is changed. In the case of the low level, it switches to the constant current source 47 side.

The changeover switch 49 switches according to the kick pulse supplied from the kick pulse generation circuit 51, and is turned on while the kick pulse is supplied.

The changeover switch 50 is turned on in response to a PLL lock detection signal supplied from the PLL lock detection circuit 52. When the PLL lock detection signal is at a low level, it is turned on, and when the PLL lock detection signal is at a high level. If you want to turn off.

The kick pulse generating circuit 51 is connected to the CPU 30
Is a circuit that generates a kick pulse while the kick pulse enable signal supplied from is supplied. This kick pulse has a pulse width of T1 time (the output frequency of the clock signal from the voltage control oscillating unit 45 fluctuates by 1%). Thereafter, it is determined whether the clock signal from the voltage control oscillating unit 45 is locked. In this case, a time T2 for performing the operation is left. This kick pulse is output until the clock signal from the voltage controlled oscillator 45 is locked.

When the constant current on the positive side from the constant current source 46 is supplied to the adder 44 for one kick pulse, the output frequency of the voltage controlled oscillator 45 fluctuates by 1%. When the constant current on the negative side from the constant current source 47 is supplied to the adder 44 for one kick pulse, the voltage control oscillator 45
Fluctuates to a higher output frequency by 1%.

The PLL lock detection circuit 52 uses the signal having a pulse width proportional to the phase difference supplied from the phase comparator 41 to output the binarized signal from the binarization circuit 18 a and the clock from the voltage controlled oscillator 45. When the phase of the signal matches, the PLL lock is detected and a PLL lock detection signal is output. The PLL lock detection signal from the PLL lock detection circuit 52 is output to the changeover switch 50.

As shown in FIG. 5D, the CPU 30 outputs the kick pulse enable signal to the kick pulse from the end of the seek to the turning on of a predetermined track until the supply of the PLL lock detection signal. Output to the generation circuit 51.

When the optical head 5 seeks (moves) from the track in the outer zone to the track in the inner zone, the CPU 30 changes the frequency direction setting signal from low level to high level, When the optical head 5 seeks (moves) from the track of the zone on the side to the track of the zone on the outer peripheral side, the frequency direction setting signal changes from the high level to the low level.

Next, a description will be given of a process of pulling in a reproduction clock when the optical head 5 seeks (moves) from a track in a predetermined zone to a track in another zone in the above configuration.

First, the process of pulling in the reproduction clock when the optical head 5 seeks (moves) from the track in the outer zone to the track in the inner zone on the optical disc 1 will be described with reference to FIGS. This will be described with reference to a signal waveform diagram shown in FIG.

For example, the optical head 5 starts to seek from the track on the outer peripheral zone on the optical disc 1 to the track on the inner peripheral zone. During this seek, C
The PU 30 changes the frequency direction setting signal to a high level, as shown in FIG. As a result, the changeover switch 48 is switched to the constant current source 46 side, and the current from the constant current source 46 is guided to the changeover switch 49.

Also, during the seek, the phase of the binary signal from the binary circuit 18a in the data reproducing circuit 18 and the phase of the clock signal from the voltage controlled oscillator 45, which are compared by the phase comparator 41, As shown in FIG. 5F, the PLL lock detection signal goes low from the PLL lock detection circuit 52. Thereby, the changeover switch 5
0 is turned on.

Then, the seek of the optical head 5 is completed,
When turning on the track in the inner zone, the CPU 30
Outputs a kick pulse enable signal to the kick pulse generation circuit 51 as shown in FIG. Then, the kick pulse generating circuit 51 outputs a kick pulse to the changeover switch 49 as shown in FIG.
As a result, when the changeover switch 49 is turned on in response to the kick pulse, the current of the constant current source 46 from the changeover switch 48 is guided to the adder 44 via the changeover switches 49 and 50.

As a result, the output voltage from the adder 44 becomes
As shown in FIG. 5F, the current increases with the current of the constant current source 46. As a result, as shown in FIG. 5G, the frequency of the clock signal output from the voltage controlled oscillator 45 is reduced by 1%.

Thereafter, every time a kick pulse is output,
The frequency of the clock signal output from the voltage controlled oscillator 45 decreases by 1%. Then, the voltage control oscillator 45
When the phase of the clock signal output from the clock signal coincides with the phase of the binary signal from the binary circuit 18a and the PLL lock detection signal goes high, the switch 50 is turned off,
The kick pulse enable signal goes low.

As described above, by locking the PLL, the address of the header of the corresponding track can be read from the reproduction signal, and the reproduction process can be performed before the rotation speed of the motor 3 is stabilized. Processing can be performed quickly.

After the PLL is locked, the clock signal output from the voltage controlled oscillator 45 and the binarization circuit 18a
When the rotation speed of the motor 3 is stabilized by comparing the phase with the binarized signal from the controller and correcting the clock signal, a clock signal of a predetermined frequency (standard) is output from the voltage control oscillator 45. Is output.

When the optical head 5 seeks (moves) from the track in the inner zone to the track in the outer zone on the optical disc 1, the changeover switch 48 is switched to the constant current source 47 side, and the constant current source 47 is set. Since the current from the current source 47 is guided to the adder 44 for each kick pulse, the frequency of the clock signal output from the voltage control oscillator 45 becomes 1%.
It gets higher every minute.

Then, the phase of the clock signal output from the voltage controlled oscillator 45 matches the phase of the binary signal from the binary circuit 18a, and the PLL is locked, so that the header of the corresponding track from the reproduced signal is locked. Can be read, and the reproduction process can be performed before the rotation speed of the motor 3 is stabilized, so that the reproduction process can be performed quickly.

As described above, in the MCLV type optical disk apparatus in which the rotation speed of the optical disk differs for each zone, when data is reproduced by moving the zone, before the rotation speed corresponding to the zone to be reproduced is reached. (Before the motor is established), the reproduction PLL can be pulled in and the data can be reproduced.

That is, when seeking from the outer side to the inner side, the pull-in processing of the reproduction PLL is performed using a frequency lower than the normal frequency, and when seeking from the inner side to the outer side, Using a higher frequency than the regular frequency,
This is to perform a pull-in process of the reproduction PLL.

Thus, when moving to a desired zone, the reproducing operation can be performed before the rotation speed of the zone is reached and the rotation speed is not stable, and the access time for reproducing data can be improved. Can be shortened, and the seek time can be shortened.

That is, before the motor is established, it is known whether the frequency of the reproduced data is higher or lower than the regular frequency based on the seek direction, so that the frequency direction setting output based on the seek direction is set. By signal
The direction of the constant current flowing through the integrator by the kick pulse is set (selected). Thereby, the seek is completed, and PL
When the L servo is stabilized, the kick pulse is enabled, and the frequency of the clock signal from the voltage controlled oscillator increases or decreases depending on the current corresponding to the kick pulse. Thereafter, when the phase of the reproduced binary signal coincides with the phase of the clock signal from the voltage controlled oscillator, the lock of the PLL is detected, and at this point, the output of the kick pulse is stopped. In the above example, the recording / reproducing optical disk device has been described. However, the present invention is not limited to this, and the present invention can be similarly applied to a reproduction-only optical disk device.

[0061]

As described in detail above, according to the present invention, when a user moves to a desired zone, the reproducing operation is performed before the rotation speed of the zone is reached and the rotation speed is not stable. Thus, an optical disk device capable of shortening the access time when reproducing data can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of an optical disk device for describing an embodiment of the present invention.

FIG. 2 is a view for explaining an example of the format of an optical disc.

FIG. 3 is a diagram for explaining a table in which speed data values corresponding to the number of rotations of the optical disk for each zone are stored.

FIG. 4 is a block diagram illustrating a configuration of a PLL circuit.

FIG. 5 is a signal waveform diagram showing a timing chart of a main part of the PLL circuit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Optical disk 1 ₁ ... Header part 2 ... Memory 2a ... Table 13 ... Laser control circuit 14 ... Modulation circuit 15 ... Laser drive circuit 16 ... PLL circuit 18 ... Data reproduction circuit 18a ... Binarization circuit 30 ... CPU 41 ... Phase comparison Device 42 charge pump 43 integrator 44 adder 45 voltage control oscillator 46, 47 constant current source 48, 49, 50 changeover switch 51 kick pulse generation circuit 52 PLL lock detection circuit

Claims (4)

[Claims] 1. An optical disc apparatus having a recording track on which data is recorded in a spiral or concentric manner and reproducing data from an optical disc comprising a zone of a plurality of recording tracks. An optical head for performing, a rotating unit for rotating the optical disk at a different rotation number for each zone, a moving unit for moving the optical head to a predetermined zone by moving the optical head in a radial direction of the optical disk, Storage means for storing speed data corresponding to the number of rotations for each zone; and speed data corresponding to the destination zone when the optical head is moved by the moving means to perform reproduction in another zone. Reading means for reading the data from the storage means, and rotating the rotating means with the speed data read by the reading means. First processing means, generating means for generating a reproduction clock based on reproduction data reproduced by the optical head, and reproduction by the optical head based on the reproduction clock generated by the generation means Demodulating means for demodulating reproduced data to be reproduced, and when moving to another zone on the optical disk, changing the frequency of a reproducing clock generated by the generating means to a lower or higher frequency, and reproducing the changed frequency. An optical disc device, comprising: second processing means for demodulating, by the demodulation means, reproduction data reproduced by the optical head based on the clock. 2. An optical disk apparatus having a recording track on which data is recorded in a spiral or concentric manner and reproducing data from an optical disk comprising a plurality of zones each including a plurality of recording tracks. An optical head for performing, a rotating unit for rotating the optical disk at a different rotation number for each zone, a moving unit for moving the optical head to a predetermined zone by moving the optical head in a radial direction of the optical disk, Storage means for storing speed data corresponding to the number of rotations for each zone; and speed data corresponding to the destination zone when the optical head is moved by the moving means to perform reproduction in another zone. Reading means for reading the data from the storage means, and rotating the rotating means with the speed data read by the reading means. First processing means, generating means for generating a reproduction clock based on reproduction data reproduced by the optical head, and reproduction by the optical head based on the reproduction clock generated by the generation means Demodulating means for demodulating the reproduced data to be reproduced; and when moving from the inner zone to the outer zone of the optical disc, the frequency of the reproducing clock generated by the generating means is reduced. The reproduction data reproduced by the optical head is demodulated by the demodulation means on the basis of the above, and when moving from the outer peripheral zone to the inner peripheral zone of the optical disc, the reproduction clock generated by the generating means is A second frequency for increasing the frequency and demodulating the reproduction data reproduced by the optical head by the demodulation means based on the reproduction clock. Optical disk apparatus characterized by comprising a physical means. 3. An optical disk apparatus having a recording track on which data is recorded spirally or concentrically, and reproducing data from an optical disk comprising a plurality of recording track zones. An optical head for performing, a rotating unit for rotating the optical disk at a different rotation number for each zone, a moving unit for moving the optical head to a predetermined zone by moving the optical head in a radial direction of the optical disk, Storage means for storing speed data corresponding to the number of rotations for each zone; and speed data corresponding to the destination zone when the optical head is moved by the moving means to perform reproduction in another zone. Reading means for reading the data from the storage means, and rotating the rotating means with the speed data read by the reading means. First processing means, generating means for generating a reproduction clock based on reproduction data reproduced by the optical head, and reproduction by the optical head based on the reproduction clock generated by the generation means Demodulating means for demodulating reproduced data to be reproduced, first and second constant current sources for generating constant currents having different directions, and a reproducing clock generated by the generating means after the movement of the optical head is started. Generating means for sequentially generating a kick pulse until is locked; and selecting a current from the first constant current source when moving from an inner zone to an outer zone of the optical disc;
Selecting means for selecting a current from the second constant current source when moving from an outer zone to an inner zone of the optical disc; and the first or second constant selected by the selecting means. Output means for outputting a current from a current source for the time of a kick pulse generated by the generating means; and applying a current output by the output means to the generating means, thereby forming an inner zone of the optical disk. When moving from the zone to the zone on the outer circumference side, the frequency of the reproduction clock generated by the generation means is lowered, and the reproduction data reproduced by the optical head based on the reproduction clock is demodulated by the demodulation means. When moving from the outer zone to the inner zone of the optical disc, the frequency of the reproduction clock generated by the generating means is increased. Optical disc apparatus, wherein a reproduction data reproduced by said optical head based on the clock for raw equipped and a second processing means for demodulating by the demodulation means. 4. An optical disk having a recording track on which data is recorded spirally or concentrically, and for recording data on an optical disk comprising a plurality of zones of recording tracks or reproducing data recorded on the optical disk. In the apparatus, an optical head for recording and reproducing data on and from the optical disk, a rotating means for rotating the optical disk at a different rotation speed for each zone, and moving the optical head in a radial direction of the optical disk Moving means for moving the optical head to a predetermined zone, a storage means for storing speed data corresponding to the number of revolutions of each zone of the optical disc, and moving the optical head by the moving means for reproduction in another zone Reading means for reading speed data corresponding to the destination zone from the storage means when performing First processing means for rotating the rotating means with the speed data read by the optical head; generating means for generating a reproduction clock based on the reproduction data reproduced by the optical head; Demodulation means for demodulating the reproduction data reproduced by the optical head based on the reproduction clock; and when moving to another zone on the optical disk, lowering the frequency of the reproduction clock generated by the generation means. Or an optical disk characterized by comprising: a second processing unit that changes the frequency to a higher value and demodulates the reproduction data reproduced by the optical head based on the clock for reproduction of the changed frequency by the demodulation unit. apparatus.