JPH1166726A - Optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reproducing performance without imparing recording performance by making rotation control at the time of recording variable and making rotation control at the time of reproduction almost constant and setting a revolving speed at the time of reproduction to the maximum revolving speed or below at the time of recording. SOLUTION: A laser control circuit 33 records data by controlling a semiconductor laser oscillator 39 with a data clock at the time of recording and recording data of a data generating circuit 34. Moreover, a data reproducing circuit 38 reproduces data for reproduction with a clock for reproduction. At this time, the DVD-RAM format of an optical disk 1 is divided into plural zones and it is needed to decide revolving speeds in respective zones in order to fix a recording and reproducing linear velocity and at the time of recording, revolving speeds are made to be prescribed values in which stable possible linear speeds are limited from the viewpoint of the characteristic of a recording medium and at the time of reproduction, since the influence of the characteristic of the medium is not present, a data read time is shortened by revolving the optical disk as much as fast. However, when revolutions of the disk are made fast in all areas, since at the time of operation shifts among reproductions and recordings, changes of revolving speeds become large every time the operation shifts and changing times are needed largely, a revolution at the time of recording is made a variable type revolution and a revolution at the time of reproduction is made a constant revolution.

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 recording data on an optical disk and reproducing data recorded on the optical disk.

[0002]

2. Description of the Related Art Conventionally, there has been known an optical disk apparatus that records data on an optical disk having a recording track or reproduces data recorded on the optical disk by using a laser beam output from a semiconductor laser oscillator mounted on an optical head. Has been put to practical use.

The above optical disk is divided into a plurality of zones composed of a plurality of tracks in a radial direction of the optical disk, and each zone has the same number of sectors per track.

In the above-described optical disk apparatus, recording can be performed only at a substantially fixed linear velocity (the moving speed of the track on the optical disk by the laser light of the optical head is almost constant) due to the characteristics of the optical disk. For this reason, at the time of data recording, rotation is performed at a different rotation speed for each zone. That is, the number of revolutions is changed according to the radial direction of the recording position.

Also, during reproduction, the number of revolutions is changed for each zone in the radial direction as in recording. For this reason, since the reproducing speed is adjusted at the time of recording, there is a disadvantage that the recording speed and the reproducing speed are determined by the characteristics of the optical disk, and the speed cannot be further increased.

[0006]

SUMMARY OF THE INVENTION According to the present invention, when data is recorded on an optical disk composed of a plurality of zones each having a plurality of tracks, the optical disk is rotated at a different rotation speed for each zone. The data is recorded based on a clock signal having a substantially constant frequency for each zone, and at the time of data reproduction, the rotation speed in each zone is substantially constant, and the data is recorded based on a clock signal having a different frequency for each zone. By playing back the data
That is, the rotation control at the time of recording is a variable type (ZCLV), the rotation control at the time of reproduction is almost constant rotation (ZCAV), and the rotation speed at the time of reproduction is set to be equal to or less than the maximum rotation speed at the time of recording. It is an object of the present invention to provide an optical disk device that can improve the performance at the time of reproduction without deteriorating the performance.

[0007]

An optical disk apparatus according to the present invention is characterized in that data is recorded on an optical disk composed of a plurality of zones each including a plurality of tracks, and data recorded on the optical disk is reproduced. In a state where it rotates at a different rotation speed for each zone of
Recording means for recording data on the optical disc;
Each of the zones of the optical disc is recorded on the optical disc at substantially the same rotational speed and at the same rotational speed as the maximum rotational speed at the time of recording and within 2.4 times the minimum rotational speed. It consists of a reproducing means for reproducing data.

An optical disk apparatus according to the present invention, which records data on an optical disk composed of a plurality of zones each including a plurality of tracks, and reproduces data recorded on the optical disk, is different for each zone of the optical disk. Recording means for recording data on the optical disk while rotating at the same rotational speed, and rotating at substantially the same rotational speed in each zone of the optical disk and within twice the minimum rotational speed at the time of recording. With the number rotated,
It comprises reproducing means for reproducing data recorded on the optical disk.

An optical disk device according to the present invention is a device for recording data on an optical disk comprising a plurality of zones of a plurality of tracks and reproducing data recorded on the optical disk. Generating means for generating a recording clock of the same frequency for each of the zones, and generating a reproduction clock of a different frequency for each of the zones when reproducing the data recorded on the optical disc; Recording means for recording data on the optical disk based on a recording clock generated by the generating means in a state of rotating at different rotational speeds, and each zone of the optical disk at substantially the same rotational speed, and With the rotation at the same rotation speed as the maximum rotation speed at the time of recording and within 2.4 times the minimum rotation speed, Based on the reproduction clock generated by the generating means and a reproducing means for reproducing data recorded on the optical disc.

An optical disk device according to the present invention is a device for recording data on an optical disk composed of a plurality of zones of a plurality of tracks and reproducing data recorded on the optical disk. Generating means for generating a recording clock of the same frequency for each of the zones, and generating a reproduction clock of a different frequency for each of the zones when reproducing the data recorded on the optical disc; Recording means for recording data on the optical disk based on a recording clock generated by the generating means in a state of rotating at different rotational speeds, and each zone of the optical disk at substantially the same rotational speed, and Generated by the generation means in a state where the rotation is performed at a rotation speed within twice the minimum rotation speed at the time of recording. That consists of reproducing means for reproducing data recorded on the optical disc based on the reproduction clock.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG.
1 shows an optical disk device. This optical disc apparatus records data (information) or reproduces recorded data on an optical disc (DVD-RAM) 1 as a recording medium by using focused light.

The optical disk 1 is formed by coating a metal film layer in a donut shape on the surface of a substrate formed in a circle of, for example, glass or plastics.
Data recording or reproduction of recorded data is performed using both concentric or spiral grooves and lands, and address data is recorded at predetermined intervals by recording marks (emboss data) in a mastering step. It is a phase change type and rewritable disk.

The optical disk 1 has a lead-in area 2, a data area 3, and a lead-out area 4, as shown in FIGS. Lead-in area 2
Consists of an emboss data zone 5 composed of a plurality of tracks and a rewritable data zone 6 composed of a plurality of tracks. In the emboss data zone 5, reference signals and control data are recorded at the time of manufacturing. The rewritable data zone 6 includes a guard track zone, a disk test zone, a drive test zone, a disk identification data zone, and a replacement management zone as a replacement management area.

The data area 3 is composed of a plurality of, for example, 24 zones 3a,. The lead-out area 4 is composed of a plurality of tracks, and is a rewritable data zone, like the rewritable data zone 6, so that the same recorded contents as the data zone 6 can be recorded.

The optical disk 1 is, as shown in FIG.
Data zone 6 and data area 3 which are rewritable with emboss data zone 5 of lead-in area 2 in order from the inside
3x, and the data zone of the lead-out area 4.

In the zones 3a,... 3x of the data area 3, the number of sectors per track increases as going from the inner circumference to the outer circumference of the optical disk 1, and the rotation speed (speed) during recording gradually decreases. It is supposed to. In addition, the number of revolutions during reproduction is constant in any zone.

The number of revolutions at the time of recording is 2600.00 r
pm (maximum rotation speed) to 1100.95 rpm (minimum rotation speed), and the rotation speed at the time of reproduction is the same as the maximum rotation speed at the time of recording, and is lower than the minimum rotation speed at the time of recording. Is also within 2.4 times.

The clock frequency at the time of reproduction ranges from 31.11 MHz to 73.1 for each of the zones 3a,.
It changes in order between 9 MHz. The formula for calculating this clock is (number of channel bits in one round) × number of rotations / 60, and number of channel bits in one round = 16 (number of channel bits per byte) × 17 to 40 (number of sectors in one round) ) × 2639 (the number of bytes in one sector).

(DVD-RAM format)
The frequency of the data clock during recording is 31.11 MHz
It is constant. The relationship among the number of sectors per track, the starting radius position, the number of tracks, the number of sectors, the number of reproduction rotations, the number of recording rotations, and the reproduction clock frequency for each of the zones 3a,. Table 10
a.

.. 3x of the data area 3
As shown in FIGS. 2 and 3, data is recorded in advance in each track in units of ECC (error correction code) block data (for example, 38688 bytes) as a unit of data recording.

.. 3x of the data area 3
As shown in FIG. 2, each track has
A header section 11 in which addresses and the like are recorded, respectively.
Are pre-formatted in advance.

In FIG. 1, the optical disk 1
Is rotated at a different rotation speed for each zone by the motor 23, for example. The motor 23 is controlled by a motor control circuit 24.

Recording of data on the optical disc 1;
Alternatively, reproduction of data recorded on the optical disk 1 is performed by the optical head 25. The optical head 25 is fixed to a drive coil 27 constituting a movable part of a linear motor 26, and the drive coil 27 is connected to a linear motor control circuit 28.

A speed detector 29 is connected to the linear motor control circuit 28, and sends a speed signal of the optical head 25 to the linear motor control circuit 28. Further, a permanent magnet (not shown) is provided in a fixed portion of the linear motor 26, and the drive coil 27 is excited by a linear motor control circuit 28,
The optical head 25 is moved in the radial direction of the optical disc 1.

The optical head 25 has an objective lens 30
Are supported by a wire or a leaf spring (not shown), and the objective lens 30 is moved in a focusing direction (an optical axis direction of the lens) by a driving coil 31.
The drive coil 32 can move in a tracking direction (a direction orthogonal to the optical axis of the lens).

Further, the semiconductor laser oscillator 39 is driven by the laser control circuit 33 to generate a laser beam. The laser control circuit 33 corrects the amount of laser light from the semiconductor laser oscillator 39 in accordance with the monitor current from the photodiode PD for monitoring the semiconductor laser oscillator 39.

The laser control circuit 33 operates in synchronization with a recording clock signal from the PLL circuit 37. The PLL circuit 37 divides the frequency of the basic clock signal from the oscillator 36 to generate a clock signal for recording.

PLL (Phase Locked Loop) circuit 37
Is a crystal oscillator 3 as a reference clock generator during recording.
6 is divided into a frequency divided by a predetermined dividing value set by the CPU 50, thereby generating a clock signal (constant) for recording and a basic clock signal generated from the crystal oscillator 36. The clock signal is frequency-divided into a frequency divided by a different frequency for each of the zones 3a,... 3x of the data area 3 set by the CPU 50.
... Rotation control clocks (26
00.00 rpm to 1100.95).

At the time of reproduction, the PLL circuit 37 outputs a basic clock signal from the crystal oscillator 36 to the CPU 50.
, Zone 3a of the data area 3 set by
.. 3x of the data area 3 so that the data clock and the data reproduction circuit 3 have different frequencies for each of the zones 3a,.
8 for selectively outputting a clock signal for reproduction in accordance with one of the binarization signals from a binarization circuit (not shown). That is, when an access involving movement (change) of a zone is performed, the frequency of the clock signal for reproduction is previously adjusted to the frequency of the access destination,
When the access is completed, the process shifts to the generation of the clock signal for reproduction based on the binarized signal from the binarization circuit of the data reproduction circuit 38, thereby quickly generating the clock signal for stable reproduction. be able to.

At the time of reproduction, the PLL circuit 37 outputs a basic clock signal from the crystal oscillator 36 to the CPU 50.
Is divided into a frequency divided by a predetermined dividing value set by the above, whereby the zones 3a,.
x constant rotation control clock signal (2600.00 rp
m).

Then, the laser light generated by the semiconductor laser oscillator 39 driven by the laser control circuit 33 is irradiated on the optical disk 1 via the collimator lens 40, the half prism 41 and the objective lens 30, and is emitted from the optical disk 1. Is guided to the photodetector 44 via the objective lens 30, the half prism 41, the condenser lens 42, and the cylindrical lens 43.

The photodetector 44 is composed of four divided photodetection cells 44a, 44b, 44c and 44d. The output signal of the photodetector cell 44a of the photodetector 44 is supplied to one end of an adder 46a via an amplifier 45a, and the output signal of the photodetector cell 44b is supplied to one end of an adder 46b via an amplifier 45b. And the light detection cell 44c
Is supplied to the other end of the adder 46a via the amplifier 45c, and the output signal of the photodetection cell 44d is supplied to the other end of the adder 46b via the amplifier 45d.

The output signal of the photodetector cell 44a of the photodetector 44 is supplied to one end of an adder 46c via an amplifier 45a, and the output signal of the photodetector cell 44b is supplied to an amplifier 45a.
b is supplied to one end of an adder 46d, and the output signal of the photodetection cell 44c is supplied to the adder 46d via an amplifier 45c.
d, the output signal of the photodetection cell 44d is
The signal is supplied to the other end of the adder 46c via the amplifier 45d.

The output signal of the adder 46a is supplied to the inverting input terminal of the differential amplifier OP2.
Is supplied with the output signal of the adder 46b. As a result, the differential amplifier OP2 outputs a signal (focus error signal) relating to the focus point according to the difference between the adders 46a and 46b.
To be supplied. The output signal of the focusing control circuit 47 is
And the laser light is controlled so that it is always just focused on the optical disc 1.

The output signal of the adder 46c is supplied to the inverting input terminal of the differential amplifier OP1.
Is supplied with the output signal of the adder 46d. Thus, the differential amplifier OP1 supplies a tracking error signal to the tracking control circuit 48 according to the difference between the adders 46c and 46d.
The tracking control circuit 48 creates a track drive signal according to the tracking error signal supplied from the differential amplifier OP1.

The track drive signal output from the tracking control circuit 48 is supplied to the drive coil 32 in the tracking direction. The tracking error signal used in the tracking control circuit 48 is supplied to the linear motor control circuit 28.

Each of the light detection cells 44 of the light detector 44 in the state where the focusing and tracking are performed as described above.
a, the sum signal of the outputs of .about.
The signal obtained by adding the output signal from 6d by the adder 46e is
The change in reflectivity from pits (recording data) formed on the track is reflected. This signal is supplied to a data reproducing circuit 38, where the recorded data is reproduced.

The reproduced data reproduced by the data reproducing circuit 38 is subjected to error correction by an error correcting circuit 52 using an applied error correcting code ECC, and then an optical disk as an external device is transmitted via an interface circuit 55. Output to control device 56.

Further, when the objective lens 30 is moved by the tracking control circuit 48, the linear motor control circuit 28 controls the linear motor 26, that is, the optical motor 26 so that the objective lens 30 is located near the center position in the optical head 25. The head 25 is moved.

A data generation circuit 34 is provided at a stage preceding the laser control circuit 33. The data generation circuit 34 receives the format data of the ECC block as the recording data supplied from the error correction circuit 52,
Recording EC with synchronization code for ECC block
It has an ECC block data generation circuit 34a for converting the data into C block format data, and a modulation circuit 34b for modulating the recording data from the ECC block data generation circuit 34a by the 8-16 code conversion method.

The data generation circuit 34 is supplied with recording data to which an error correction code has been added by the error correction circuit 52 and dummy data for error checking read from the memory 10. Error correction circuit 52
Is supplied with recording data from an optical disk control device 56 as an external device via an interface circuit 55 and a bus 49.

The error correction circuit 52 converts the 32 Kbytes of recording data supplied from the optical disk control unit 56 into 2K bytes.
Each of the horizontal and vertical error correction codes (ECC1, ECC1) for the recording data in the sector unit for each byte.
2), a sector ID (logical address number) is added, and format data of an ECC block is generated.

The optical disk device has a focusing control circuit 47 and a tracking control circuit 4 respectively.
8. A D / A converter 51 used for exchanging information between the linear motor control circuit 28 and the CPU 50 for controlling the entire optical disk device is provided.

The motor control circuit 24, linear motor control circuit 28, laser control circuit 33, data reproduction circuit 3
8, a focusing control circuit 47, a tracking control circuit 48, an error correction circuit 53, etc.
This is controlled by the PU 50, and this C
The PU 50 performs a predetermined operation according to a control program recorded in the memory 10.

The memory 10 stores a control program and is used for data recording. The memory 10 stores, for each of the zones 3a,... 3x, the number of sectors per track, the starting radial position, the number of tracks, the number of sectors, the number of reproduction rotations, the number of recording rotations, the reproduction clock frequency, and the like. 10a.

As shown in FIG. 5, the PLL circuit 37 includes frequency dividers 61, 62, 63, 64, a phase comparator 65,
66, 67, filters and charge pumps 68, 6
9, 70, a voltage controlled oscillator VCO (voltage control oscillator) 71, 72, 73, and a selector 74.

The frequency divider 61 divides the basic clock from the crystal oscillator 36 by the frequency division ratio (1/1) set by the CPU 50.
M; M is a natural number), and the divided signal is output to the phase comparator 65.

The frequency divider 62 divides the frequency of the clock signal (rotation control clock) from the VCO 71 by a frequency division ratio (1 / N; N is a natural number) set by the CPU 50. It is output to the phase comparator 65.

The frequency divider 63 divides the basic clock from the crystal oscillator 36 by the frequency division ratio (1/1) set by the CPU 50.
M ′; M ′ is a natural number), and this frequency-divided signal is output to the phase comparator 66.

The frequency divider 64 divides the frequency of the clock signal (data clock) from the VCO 72 by a frequency division ratio (1 / N ';N' is a natural number) set by the CPU 50. Is output to the phase comparator 65.

The phase comparator 65 is a pull-in type phase comparator, compares the phase of the signal from the frequency divider 61 with the phase of the signal from the frequency divider 62, and is proportional to the compared phase difference and frequency difference. Output a signal having the specified pulse width. The signal from the phase comparator 65 is applied to a filter and a charge pump 68.
Is output to

The phase comparator 67 is a lock-in type phase comparator.
8 and a data clock from a binary signal (reproduction signal) from a binarization circuit (not shown) or a VCO 72 and V
It compares the phase with the clock signal from the CO 73 and outputs a signal having a pulse width proportional to the compared phase difference. The signal from the phase comparator 67 is output to the filter and charge pump 70, and the data for reproduction (channel data) synchronized with the clock signal (channel clock) is output to the data reproduction circuit 38.

The phase comparator 67 operates even if the binarized signal from the binarizing circuit receives a missing signal whose pulse cycle is not regular. The filter and charge pump 68 includes a resistor, a capacitor, an inverting amplifier, a diode, and the like, and removes a harmonic of a signal from the phase comparator 65. The signal from this filter and charge pump 68 is output to VCO 71.

The filter and charge pump 69 includes a resistor, a capacitor, an inverting amplifier, a diode, and the like, and removes a harmonic of the signal from the phase comparator 66.
The signal from this filter and charge pump 69 is V
Output to CO72.

The filter and charge pump 70 includes a resistor, a capacitor, an inverting amplifier, a diode, and the like, and removes a harmonic of the signal from the phase comparator 67.
The signal from this filter and charge pump 70 is V
Output to CO73.

The VCO 71 outputs a binary clock signal (rotation control clock) having a frequency proportional to the voltage (analog value) of the signal supplied from the filter and charge pump 68.

The clock signal from the VCO 71 is output to the frequency divider 62 and also to the motor control circuit 24. The VCO 72 outputs a binary clock signal (data clock) having a frequency proportional to the voltage (analog value) of the signal supplied from the filter and the charge pump 69.

The clock signal from the VCO 72 is output to the frequency divider 64 and the laser control circuit 33
It is output to the selector 74. The VCO 73 outputs a binary clock signal (reproduction clock) having a frequency proportional to the voltage (analog value) of the signal supplied from the filter and the charge pump 70.

The clock signal from the VCO 73 is output to the phase comparator 67 and the data reproduction circuit 3
8 is output. The selector 74 selectively compares the phase of a binarized signal (reproduced signal) from a binarized circuit (not shown) in the data reproducing circuit 38 or a data clock from the VCO 72 in accordance with a switching signal from the CPU 50. Output to the container 67. The switching signal is output when an access is made to another zone at the time of reproduction. During the period from the start of the access to the completion of the access, the selector 74 is switched to the side a in FIG. In other cases, the data is switched to the side b in the drawing, and the binarized signal from the binarizing circuit (not shown) in the data reproducing circuit 38 is selected to perform phase comparison. Output to the device 67.

Next, the operation of the above configuration will be described. For example, at the time of recording data, the track number and the sector number are transmitted from the optical disk control device 56 to the CPU 50 via the interface circuit 55 and the bus 49.
And the recording data from the optical disk control device 56 is supplied to the memory 10 via the interface circuit 55 and the bus 49 and stored therein.

The CPU 50 determines the zone based on the track number, reads the recording speed of the optical disk 1 for this zone from the table 10a, and divides the set value (M, N) corresponding to the read recording speed. Vessels 61, 6
Output to 2.

As a result, a signal obtained by dividing the reference clock signal from the crystal oscillator 36 by the division ratio 1 / M is output from the frequency divider 61 to the phase comparator 65. Then, a signal having a pulse width proportional to the phase difference and frequency difference between the signal from the frequency divider 61 and the signal from the frequency divider 62 is controlled by the phase comparator 65 via the filter and the charge pump 68 and the VCO 71. It is output to the motor control circuit 24 as a clock. As a result, the motor control circuit 24 rotates the motor 23 based on the supplied rotation control clock, thereby rotating the optical disc 1 at a rotation speed corresponding to the zone to be recorded.

Since the CPU 50 is at the time of recording,
Predetermined set values (M ′, N ′) are output to frequency dividers 63 and 64. As a result, a signal obtained by dividing the reference clock signal from the crystal oscillator 36 by the division ratio 1 / M ′ is output from the frequency divider 63 to the phase comparator 66. Then, a signal having a pulse width proportional to the phase difference and frequency difference between the signal from the frequency divider 63 and the signal from the frequency divider 64 is recorded by the phase comparator 66 via the filter and the charge pump 69 and the VCO 72. Laser control circuit 3 as the data clock for
3 is output.

The CPU 50 controls the linear motor control circuit 28 and the tracking control circuit 48 according to the track numbers. Thereby, the optical head 25
Moves to the track corresponding to the track number (access processing).

As a result, the laser control circuit 33 performs data recording by controlling the drive of the semiconductor laser oscillator 39 based on the supplied data clock at the time of recording and the recording data from the data generating circuit 34.

When recording in another zone is instructed in this state, the CPU 50 reads out the recording rotation speed of the optical disk 1 for the other zone from the table 10a, and sets a value corresponding to the read recording rotation speed ( M,
N) is output to frequency dividers 61 and 62. Thereafter, the operation is the same as described above.

When data is reproduced, a track number and a sector number are supplied from the optical disk control device 56 to the CPU 50 via the interface circuit 55 and the bus 49.

As a result, the CPU 50 outputs the predetermined set values (M, N) to the frequency dividers 61 and 62 since the reproduction is being performed. As a result, a signal obtained by dividing the reference clock signal from the crystal oscillator 36 by the division ratio 1 / M is divided by the frequency divider 6
1 to the phase comparator 65. Then, a signal having a pulse width proportional to the phase difference and frequency difference between the signal from the frequency divider 61 and the signal from the frequency divider 62 is controlled by the phase comparator 65 via the filter and the charge pump 68 and the VCO 71. It is output to the motor control circuit 24 as a clock. As a result, the motor control circuit 24 rotates the motor 23 based on the supplied rotation control clock, so that the optical disk 1 rotates at a constant rotational speed (2600.00 rpm) regardless of the zone in which reproduction is performed. I do.

The CPU 50 determines the zone based on the track number, reads the frequency of the data clock for reproducing the optical disk 1 for this zone from the table 10a, and sets the set values (M ',
N ′) is output to the frequency dividers 63 and 64.

As a result, a signal obtained by dividing the reference clock signal from crystal oscillator 36 by the division ratio 1 / M ′ is output from frequency divider 63 to phase comparator 66. Then, a signal having a pulse width proportional to the phase difference and frequency difference between the signal from the frequency divider 63 and the signal from the frequency divider 64 is output from the phase comparator 66 to the filter and charge pump 69 and the VCO 72.
Is output to the selector 74 as a data clock corresponding to the zone to be reproduced.

At the start of the reproduction, the CPU 50 outputs a selection signal to the selector 74 to switch the selector 74 to the side a so that the data clock from the VCO 72 is guided to the phase comparator 67. .

Accordingly, when the data clock from VCO 72 is supplied to phase comparator 67, phase comparator 67 reduces the pulse width proportional to the phase difference and frequency difference between the signal from VCO 73 and the data clock from VCO 72. The signal that the filter and the charge pump 70, VC
A reproduction clock (channel clock) corresponding to the zone to be reproduced is output via O73.

The CPU 50 controls the linear motor control circuit 28 and the tracking control circuit 48 according to the track numbers. Thereby, the optical head 25
Moves to the track corresponding to the track number (access processing).

In this state, the reproduced signal as the output signal from the adder 26 e is binarized by the binarizing circuit of the data reproducing circuit 38 and supplied to the selector 74 of the PLL circuit 37.

When the laser beam from the optical head 25 has moved to the zone for reproduction (determined by the control signal of the linear motor control circuit 28 or the tracking control circuit 48), the CPU 50 switches the selector 74 to the b side. The binary signal from the binary circuit of the data reproducing circuit 38 is supplied to the phase comparator 67 via the selector 74. As a result, a signal having a pulse width proportional to the phase difference and frequency difference between the binary signal from the binary circuit and the signal from the VCO 73 is reproduced by the phase comparator 67 as reproduction data (channel data). The output to the circuit 38, the filter and the charge pump 70, the VCO
A reproduction clock (channel clock) corresponding to the zone to be reproduced is output via 73.

Thus, the data reproduction circuit 38 reproduces the supplied reproduction data based on the reproduction clock. In this state, when reproduction in another zone is instructed, the CPU 50 sets the frequency of the clock for reproducing the optical disk 1 in the other zone in the table 10a.
And the set values (M ′, N ′) corresponding to the read frequency are output to the frequency dividers 63 and 64. Thereafter, the operation is the same as described above.

When the operation shifts from the recording operation to the reproduction operation and from the reproduction operation to the recording operation, the rotation speed and the clock frequency are different even in the same zone. It operates by referring to the value of.

As described above, the optical disk DVD-R
The AM format has zones divided in the radial direction,
To make the transfer rate (recording / playback linear speed) almost fixed,
It is necessary to determine the number of revolutions for recording and reproduction depending on each zone. However, at the time of recording, the linear velocity that can be stabilized is currently limited to the upper limit of the characteristics of the medium (optical disk), so it is necessary to control the rotation speed to a predetermined value. It is advantageous to rotate as soon as possible because the data reading time is shortened.

At this time, if the rotation speed during recording is simply made faster in all the areas on the medium, it is necessary to shift the operation from the reproduction state to the recording state or vice versa. In this case, the number of revolutions has to be greatly changed each time, so that there is a disadvantage that the switching time is required. Power consumption also increases.

That is, during reproduction, the entire surface of the medium is
Attempting to reproduce at a certain rotation speed, the transfer clock is too fast at the outermost circumference, or the rotation speed of recording / reproduction at the outermost circumference is more than doubled, and the rotation speed of recording / reproduction is increased. If the switching time becomes longer, the clock becomes faster and the power consumption increases, or if the power consumption is reduced, the playback speed at the innermost circumference will be slower, which causes a practical downside.

Therefore, as described above, the rotation control at the time of recording is of a variable type (ZCLV), the rotation control at the time of reproduction is substantially constant (ZCAV), and the rotation speed at the time of reproduction is less than the maximum rotation speed at the time of recording. By setting, the performance at the time of reproduction can be improved without impairing the performance at the time of recording.

In this case, it is preferable to keep the recording / reproducing rotation ratio within 2.4 times even at the outermost periphery. Alternatively, if the maximum number of revolutions during recording is equal to or greater than the number of revolutions during reproduction, the change width of rotation between recording and reproduction can be reduced.

In general, the number of times of reproduction of the operation of the optical disk is greater than the number of times of recording, so that the rotation during reproduction is controlled to be substantially constant, even if an access operation between data is performed. In addition, since the rotation change time can be reduced or shortened, and the access speed is increased, the performance of the apparatus as a whole is improved. For the above reason, if the number of rotations is set at the time of performing reproduction after the end of recording, the probability that a reproduction instruction is issued from the host computer (optical disk control circuit) is high. If the recording instruction is issued, Also,
In general, the deceleration time is shorter due to the characteristics of the rotary motor, so that the overall performance can be improved.

Further, as described above, when moving to a predetermined zone and performing reproduction, the frequency of the PLL for generating a reproduction clock is set in advance to a state of generating a clock having a frequency corresponding to the zone. Since the PLL for generating the reproduction clock based on the reproduction data is turned on at the time of the completion of the movement in which the laser light of the optical head is likely to be in the tracking state, the PLL is continually turned on during the movement, thereby causing an error. When the clock frequency is significantly different from the frequency corresponding to the zone (it is possible to generate clocks of various frequencies), it is possible to avoid the disadvantage that it takes time until a normal clock is generated. it can.

In the above example, the case where the reproduction rotation speed is the same as the maximum rotation speed at the time of recording and rotates at a rotation speed within 2.4 times the minimum rotation speed has been described. The same can be applied to a case where the number of rotations is lower than the maximum number of rotations at the time of recording, and the number of rotations for reproduction is less than twice the number of recordings for each zone.

For example, as shown in FIG. 6, the reproduction rotational speed is constant at 2200.00 rpm for each zone, and the recording rotational speed is 2600.00 rpm for zone 0 on the inner peripheral side.
To 1100.95 rpm for zone 23 on the outer peripheral side
Are sequentially changed.

The same applies to the case where the reproduction rotational speed is equal to or lower than the maximum rotational speed at the time of recording, and the reproducing rotational speed for each zone is less than twice the recording rotational speed. it can.

For example, as shown in FIG. 7, the reproduction rotational speed from zone 0 to zone 16 is 2600.00 rpm.
When the reproduction speed from zone 17 to zone 23 is constant,
The rotation speed is sequentially changed from 91.70 rpm to 2201.90 rpm, and the recording rotation speed is 2600.
From 00 rpm to the zone 23 on the outer peripheral side.
This is a case where the speed is sequentially changed to 95 rpm. In the above case, in particular, the width of the transition from the rotation speed at the time of recording of any zone to the rotation speed at the time of reproduction can be suppressed.

[0089]

As described above in detail, according to the present invention, when data is recorded on an optical disk composed of a plurality of zones of a plurality of tracks, the optical disk is rotated at a different rotation speed for each zone. Rotate and record data based on a clock signal with a substantially constant frequency for each zone.When data is reproduced, the number of rotations in each zone is almost constant and a clock signal with a different frequency for each zone By performing the reproduction of the recorded data on the basis of that, that is, the rotation control at the time of recording is of a variable type (ZCL
V), the rotation control at the time of reproduction is substantially constant rotation (ZCAV), and the rotation speed at the time of reproduction is set to be equal to or less than the maximum rotation speed at the time of recording. An optical disk device that can be raised can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of an optical disk device according to an embodiment of the present invention.

FIG. 2 is an exemplary plan view showing a schematic configuration of the optical disc shown in FIG. 1;

FIG. 3 is a diagram showing a schematic configuration of the optical disc shown in FIG. 1;

FIG. 4 is a view showing a storage example of a table for explaining a recording rotation speed, a reproduction rotation speed, and a reproduction clock frequency for each zone of the optical disc shown in FIG. 1;

FIG. 5 is a block diagram showing a schematic configuration of the PLL circuit shown in FIG. 1;

FIG. 6 is a diagram illustrating a storage example of a table for explaining a recording rotation speed, a reproduction rotation speed, and a reproduction clock frequency for each zone of the optical disc illustrated in FIG. 1;

FIG. 7 is a view showing a storage example of a table for explaining a recording rotation speed, a reproduction rotation speed, and a reproduction clock frequency for each zone of the optical disc shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Optical disk 10 ... Memory 10a ... Table 24 ... Motor control circuit 25 ... Optical head 36 ... Crystal oscillator 37 ... PLL circuit 50 ... CPU 56 ... Optical disk control circuit

Claims (10)

[Claims] 1. An optical disk device for recording data on an optical disk comprising a plurality of zones each having a plurality of tracks and reproducing data recorded on the optical disk, wherein the optical disk device has a different rotation speed for each zone of the optical disk. A recording means for recording data on the optical disk in a rotated state; and a zone having substantially the same rotational speed in each zone of the optical disk and having a minimum rotational speed of 2.4 which is the same as the maximum rotational speed during recording.
An optical disk device, comprising: a reproducing unit that reproduces data recorded on the optical disk in a state where the optical disk is rotated at a rotation speed within double. 2. An optical disc apparatus for recording data on an optical disc composed of a plurality of zones each having a plurality of tracks, and reproducing data recorded on the optical disc, comprising: In the rotating state, the recording means for recording data on the optical disc, and each zone of the optical disc is rotated at substantially the same rotation speed and at a rotation speed within twice the minimum rotation speed at the time of recording. An optical disk device comprising: a reproducing unit that reproduces data recorded on the optical disk in a state. 3. A reproduction apparatus according to claim 2, wherein said reproducing means performs reproduction in a state where each of the zones of said optical disk is rotated at the same rotational speed as the minimum rotational speed at the time of recording. Item 3. The optical disk device according to item 2. 4. The optical disk according to claim 2, wherein said reproducing means performs reproduction in a state where each of the zones of the optical disk rotates at a rotational speed within twice the rotational speed at the time of recording. apparatus. 5. An optical disc apparatus for recording data on an optical disc consisting of a plurality of zones each having a plurality of tracks and reproducing data recorded on the optical disc, wherein each zone when data is recorded on the optical disc. Generating means for generating a recording clock of the same frequency at each time, and generating a reproduction clock of a different frequency for each zone when reproducing data recorded on the optical disc; and a different rotation for each zone of the optical disc. Recording means for recording data on the optical disk based on a recording clock generated by the generating means in a state where the number of rotations is equal to the number of rotations of each zone of the optical disk; Is the same as the maximum rotation speed and 2.4
An optical disk device comprising: a reproducing unit that reproduces data recorded on the optical disk based on a reproduction clock generated by the generating unit while rotating at a rotation speed within twice as many times. 6. A reproduction clock generated by said generating means is generated based on data reproduced by said reproducing means, and when a reproduction position moves to another zone of said optical disk, said reproduction clock is generated. The reproduction clock generated by the generation unit is set in advance to a frequency corresponding to the destination zone, and after the movement to the reproduction position is completed, the reproduction clock is generated again based on the data reproduced by the reproduction unit. The optical disk device according to claim 5, wherein 7. An optical disc apparatus for recording data on an optical disc composed of a plurality of zones each having a plurality of tracks, and reproducing data recorded on the optical disc, wherein each zone when data is recorded on the optical disc. Generating means for generating a recording clock of the same frequency at each zone and generating a reproduction clock of a different frequency for each zone when reproducing data recorded on the optical disc; and a different rotation for each zone of the optical disc. A recording unit for recording data on the optical disk based on a recording clock generated by the generating unit in a state where the number of rotations is equal to the number of rotations of each zone of the optical disk; With the rotation at a rotation speed within twice the minimum rotation speed of An optical disk device comprising: a reproducing unit that reproduces data recorded on the optical disk based on the information. 8. A reproduction clock generated by said generation means is generated based on data reproduced by said reproduction means, and when a reproduction position moves to another zone of said optical disc, said reproduction clock is generated. The reproduction clock generated by the generation unit is set in advance to a frequency corresponding to the destination zone, and after the movement to the reproduction position is completed, the reproduction clock is generated again based on the data reproduced by the reproduction unit. The optical disk device according to claim 7, wherein: 9. The apparatus according to claim 1, wherein said reproducing means performs reproduction in a state where each of the zones of said optical disk is rotated at the same rotational speed as the minimum rotational speed at the time of recording and twice as high. Item 8. An optical disk device according to item 7. 10. The optical disk according to claim 7, wherein said reproducing means performs reproduction in a state where each of the zones of the optical disk rotates at a rotation speed within twice the rotation speed at the time of recording. apparatus.