JP2001266358A - Information recorder and control circuit device using therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably reproduce a wobble reproducing signal even during the reading period of the header area whereon the wobble is recorded, in an optical disk device such as a DVD-RAM. SOLUTION: When the frequency of a wobble detecting signal is largely changed, for instance, during the reading period of the header area, this change is detected by a frequency fluctuation detecting circuit 33 to open switches 25a, 25b. Thus, the storage of a phase error signal supplied from a phase comparator circuit 24 and a frequency detecting signal supplied from a frequency detecting circuit 32 into registers 26a, 26b is interrupted, then based on the phase error signal and frequency detecting signal already stored in the registers 26a, 26b just before the interruption, the reproduction of the wobble reproducing signal in a VCO 29 is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording device and a control circuit device used therefor, and more particularly, to an optical recording device and a magneto-optical device for recording (writing) / reproducing (reading) information using light. It relates to a recording device.

[0002]

2. Description of the Related Art Recently, as an optical recording apparatus for optically writing and reading information on and from a recording medium, a DVD-R
Optical disk devices such as RAMs have been widely used. In these optical disk devices, high-density recording is being promoted year by year, and capacity is being increased. Accordingly, various systems have been proposed for servo systems such as tracking control and focusing control.

FIG. 6 shows a configuration example of a conventional optical disk device (for example, a DVD-RAM disk drive).

The optical disk 100 includes a disk motor 10
Rotated by one. The rotation speed of the disk motor 101 is controlled by the driver amplifier 102, and a pulse signal corresponding to the rotation speed is output to the driver amplifier 102.

Here, one track is formed in a spiral shape from the inner circumference to the outer circumference of the optical disc 100. The track is composed of a concave groove track and a convex land track between the groove tracks. The track is divided into a plurality of sectors, and each sector is composed of a header area and a data area.
The tracks in the data area excluding the header area are formed in a state in which the grooves meander, forming guide meandering grooves (hereinafter referred to as wobbles). The wobble is formed such that the frequency and phase are constant with respect to the header data. For example, a VCO (Voltage Control Oscillator) is generated by using the read signal (wobble signal).
Is controlled by PLL (Phase Locked Loop).
It is used for reproducing a reference signal for generating a timing signal when reproducing header data. An optical disc having such a wobble is described in detail in, for example, Japanese Patent Application Laid-Open No. 11-296911.

The optical pickup 103 irradiates the rotating optical disc 100 with a beam, detects a reflected beam on the track, for example, from a pit row (recording mark) by a built-in photodiode or the like, and outputs an RF (Radio Fr.
equency) signal. The optical pickup 103 is configured to irradiate the optical disk 100 with a beam modulated according to data to be written, thereby forming, for example, a pit row on a track (writing of recording data). .

[0007] The RF amplifier 104 amplifies the RF signal supplied from the optical pickup 103, performs waveform processing, generates a focus error signal, a tracking error signal, and the like, and sends the generated signal to the servo control circuit 105. It is configured to output. Further, the RF amplifier 104 generates a wobble detection signal based on the RF signal, and outputs it to a band-pass filter (B
PF) 106. Further, the RF amplifier 104 converts the data to be written on the optical disc 100 supplied from the recording / reproducing circuit 107 into a predetermined format and outputs the data to the optical pickup 103 or read out from the optical disc 100. It is configured to output data to be reproduced from the RF signal to the recording / reproducing circuit 107.

The servo control circuit 105 drives an actuator (not shown) in the optical pickup 103 while compensating for the gain and phase of the focus error signal and the tracking error signal supplied from the RF amplifier 104. Thus, a focus servo and a tracking servo are applied to the optical pickup 103. The servo control circuit 105 is configured to control a sled mechanism (not shown) for moving the optical pickup 103 in the radial direction of the optical disc 100. further,
This servo control circuit 105 is provided with the disk motor 10
For example, while compensating the gain and phase of the pulse signal supplied from the optical disk 100, the optical disk 100 is driven at a constant linear velocity (CLV (Constant L
inear velocity (velocity)).

The BPF 106 is configured to limit the frequency of the wobble detection signal supplied from the RF amplifier 104, remove a noise component from the wobble detection signal, and output the signal to the comparator 108.

The comparator 108 is connected to the BPF 106
Is subjected to binarization processing, and the binarized wobble detection signal (wobble binarized signal) is output to the frequency detection circuit 109 and the phase comparison circuit 110.

A frequency detection circuit 109 detects the frequency of the wobble binary signal supplied from the comparator 108 and outputs the frequency detection signal to an adder 112 via a low-pass filter (LPF) 111. It is configured to be.

The phase comparator 110 compares the phase of the wobble binary signal processed by the comparator 108 with the VCO
It is configured to compare the phase of the output from the adder 113 and output the phase error signal to the adder 112 via the LPF 114.

The adder 112 includes a VCO frequency control signal supplied via the LPF 111 and the LPF 114
The VCO control signal for controlling the VCO 113 is generated by adding a VCO phase control signal supplied through the VCO control signal.

The VCO 113 oscillates in response to the VCO control signal supplied from the adder 112, and outputs its output (PLL-locked wobble reproduction signal) to the phase comparison circuit 110 and the timing circuit 115. It is configured.

The timing circuit 115 is connected to the VCO 11
3 generates a timing signal for reproducing header data based on the PLL-locked wobble reproduction signal (reference signal) supplied from the recording / reproduction circuit 1.
07.

The recording / reproducing circuit 107 reproduces data to be reproduced from the RF signal supplied from the RF amplifier 104 and outputs the reproduced data to a system control unit (not shown) for controlling each circuit (part). Alternatively, data to be written on the optical disk 100 supplied from the system control unit is output to the RF amplifier 104.

As described above, in the conventional optical disk device, the phase comparison circuit 110, the LPF 114 and the VCO
The PLL circuit is constituted by 113. And
With this PLL circuit, a continuous wobble reproduction signal is reproduced based on a wobble detection signal read from the optical disk 100 by the optical pickup 103.

However, the above-described optical disc 100
In the case of, no wobble is recorded on the track corresponding to the header area. Therefore, the optical pickup 103
Is reading the header area, the comparator 1
08, no wobble binary signal is output, and the respective outputs of the frequency detection circuit 109 and the phase comparison circuit 110 greatly change. Therefore, during the reading period of the header area, the PLL-locked wobble reproduction signal from the VCO 113 largely deviates from the specific frequency.

Further, immediately after the reading period of the header area, there is a problem that it takes a considerable time to draw the wobble binary signal into the PLL operation again.

[0020]

As described above, conventionally, even in the case of an optical disc in which wobble recorded in a meandering track is formed intermittently, a PLL is required.
Although the operation enables continuous wobble reproduction signals to be reproduced, intermittently formed wobbles have a considerable effect on the PLL operation, for example, during the reading period of the header area, the wobble reproduction signals greatly deviate from a specific frequency. There was a problem.

Therefore, according to the present invention, the wobble reproduction signal can be reproduced stably even during the reading period of the header area, and the wobble detection signal can be quickly drawn into the PLL operation immediately after the reading period of the header area. It is an object of the present invention to provide an information recording device capable of performing the control and a control circuit device used for the information recording device.

[0022]

SUMMARY OF THE INVENTION In order to achieve the above object, a control circuit device according to the present invention comprises a guide meandering groove which is optically read from a recording medium provided intermittently. Frequency detecting means for detecting the frequency of the groove read signal; frequency storing means for storing a frequency detected value by the frequency detecting means; and a difference between a frequency stored value in the frequency storing means and a frequency detected value by the frequency detecting means. Control means for controlling the storage of the frequency detection value by the frequency detection means in the frequency storage means, based on the control of the control means. A control signal of an oscillator for outputting a reproduction signal corresponding to the meandering groove read signal from the value.

Further, in the control circuit device according to the present invention, there is provided a frequency detecting means for optically reading from a recording medium provided with intermittent guide grooves, and detecting a frequency of the read signal of the meander grooves. Frequency storage means for storing a frequency detection value by the frequency detection means; and a frequency detection means for detecting the frequency in the frequency storage means based on a difference between the frequency storage value in the frequency storage means and the frequency detection value by the frequency detection means. Control means for controlling storage of the frequency detection value by the means, and under the control of the control means, a control signal of an oscillator for outputting a reproduction signal corresponding to the meandering groove read signal from a specific value. It is characterized by generating.

According to the information recording apparatus of the present invention, there is provided a rotating means for rotating a recording medium provided with a guide meandering groove intermittently along a recording track of information, Reading means for optically reading the meandering groove to convert the meandering groove into an electric signal; frequency detecting means for detecting the frequency of the meandering groove read signal output from the reading means; and a frequency for storing a frequency detection value by the frequency detecting means. Storage means, and control means for controlling storage of a frequency detection value by the frequency detection means in the frequency storage means based on a difference between a frequency storage value in the frequency storage means and a frequency detection value by the frequency detection means. And a recording / reproducing means for writing / reading information to / from the recording medium, and under control of the control means, From the frequency values stored in the frequency storing means and the specific value, and generates a control signal of the oscillator for outputting a reproduced signal corresponding to the meandering channel read signal.

Further, in the information recording apparatus of the present invention, a rotating means for rotating a recording medium provided with a guide meandering groove intermittently along a recording track of information; Reading means for optically reading the meandering groove to convert the meandering groove into an electric signal; frequency detecting means for detecting the frequency of the meandering groove read signal output from the reading means; and a frequency for storing a frequency detection value by the frequency detecting means. Storage means, and control means for controlling storage of a frequency detection value by the frequency detection means in the frequency storage means based on a difference between a frequency storage value in the frequency storage means and a frequency detection value by the frequency detection means. And recording / reproducing means for writing / reading information to / from the recording medium, and under the control of the control means, From value, and generating a control signal of the oscillator for outputting a reproduced signal corresponding to the meandering channel read signal.

According to the information recording device of the present invention and the control circuit device used therein, during the reading period of the header area, the VCO control signal can be complemented by the wobble detection signal immediately before it. Thereby, even if the frequency and the phase difference of the wobble detection signal during the reading period of the header area greatly change before and after the period, it is possible to improve the wobble reproduction signal from largely deviating from the specific frequency. Things.

[0027]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 shows a first embodiment of the present invention.
1 shows a configuration example of an optical disc device according to an embodiment. Here, a DVD-RAM disk drive will be described as an example.

This optical disk device comprises, for example, an optical disk drive 1, a control circuit (control circuit device) 2, and a microcomputer 34.

The optical disk drive 1 includes a disk motor 11 and a driver amplifier 12 that constitute a rotating unit, and an optical pickup 13 and an RF that constitute a reading unit.
An amplifier 14 is provided. Control circuit 2
Is a servo control circuit 21, a BPF 22, a comparator 2
3, phase comparison circuit 24, switches 25a and 25b, registers 26a and 26b, LPFs 27a and 27b, adder 2
8, a VCO 29, a timing circuit 30, a recording / reproducing circuit 31, a frequency detecting circuit 32, and a frequency fluctuation detecting circuit 33.

An optical disk (recording medium) 100 is rotated by a disk motor 11. Disk motor 11
Is configured such that the rotation speed is controlled by the driver amplifier 12 and a pulse signal corresponding to the rotation speed is output to the driver amplifier 12.

Here, referring to FIG.
The outline of 0 is briefly described. As shown in FIG. 1A, for example, a large-capacity high-density phase-change optical disk such as a DVD-RAM has a single track T formed in a spiral shape from the inner periphery to the outer periphery. I have.
The track T includes a concave groove track Tg and a convex land track Tr between the groove tracks Tg.

The track T is located on the optical disk 100.
Data recording surface is divided concentrically into a plurality of zones Z.
Each of the sectors S is formed by dividing the area into several radial areas. Actually, the optical disc 100 is controlled so that the rotation speed of the optical disc in the zones Z0 to Zn becomes constant linear velocity (CLV).

Each sector S is composed of, for example, a header area Hs in which header data (address pit string) is written and a data area Ds in which user data is written, as shown in FIG. Also, the header area Hs
Are headers Hs1 and Hs2 arranged at the boundary between the groove track Tg and the land track Tr adjacent to the groove track Tg, and the boundary between the groove track Tg and the land track Tr adjacent to the groove track Tg in the inner circumference direction. Are comprised of headers Hs3 and Hs4.

The data area D excluding the header area Hs
The track T of s is formed in a state in which the groove is meandering, and is a wobble (guide meandering groove). The wobble is formed such that the frequency and the phase are constant with respect to the header data. The wobble is used, for example, for reproducing a reference signal for generating a timing signal when reproducing header data.

The optical disc 100 having such a configuration can record / reproduce information using both the groove track Tg and the land track Tr as recording tracks.

In FIG. 1, the optical pickup 13 is
The rotating optical disc 100 is irradiated with a beam, and a reflected beam from a recording mark on the track T is detected by a built-in photodiode or the like, and RF (Radio Frequenc) is detected.
y) configured to convert to a signal. The optical pickup 13 is configured to irradiate the optical disk 100 with a beam modulated according to data to be written, thereby forming a recording mark on the track T (writing of recording data).

The RF amplifier 14 amplifies the RF signal supplied from the optical pickup 13, performs waveform processing and the like, generates a focus error signal and a tracking error signal, and sends the signals to the servo control circuit 21. It is configured to output. Also, this RF
The amplifier 14 is configured to generate a wobble detection signal (a meandering groove read signal) based on the RF signal and output it to a band-pass filter (BPF) 22. Further, the RF amplifier 14 converts the data to be written on the optical disc 100 supplied from the recording / reproducing circuit 31 into a predetermined format and outputs the data to the optical pickup 13 or reads out the data from the optical disc 100. Record / reproduce data to be reproduced in RF signal
It is configured to output to the reproduction circuit 31.

The servo control circuit 21 is provided with the RF amplifier 1
By driving an actuator (not shown) in the optical pickup 13 while compensating for the gain and phase of the focus error signal and tracking error signal supplied from the optical pickup 13,
It is configured to apply focus servo and tracking servo to. Also, the servo control circuit 21
Is configured to control a sled mechanism (not shown) for moving the optical pickup 13 in the radial direction of the optical disc 100. Further, the servo control circuit 21 compensates for the gain and phase of the pulse signal supplied from the disk motor 11,
Via the driver amplifier 12, the optical disk 10
The servo is controlled so that 0 rotates at CLV.

The BPF 22 is configured to limit the frequency of the wobble detection signal supplied from the RF amplifier 14, remove a noise component from the wobble detection signal, and output the signal to the comparator 23.

The comparator 23 performs a binarization process on the signal supplied from the BPF 22, and converts the binarized wobble detection signal (wobble binarized signal) into a phase comparison circuit (phase difference detection means) 24. And a frequency detection circuit (frequency detection means) 32.

The phase comparison circuit 24 is provided with the comparator 2
3 and the VCO 29
And outputs the phase error signal (phase difference detection value) to a register (phase difference storage means) 26a via a switch 25a.

The register 26a stores the phase error signal supplied from the phase comparison circuit 24 when the switch 25a is closed, and outputs the signal to the LPF 27a. The register 26a is configured not to update its contents when the switch 25a is opened, and to continue to store the phase error signal (phase difference stored value) stored immediately before.

The LPF 27a is configured to generate a VCO phase control signal by limiting the frequency of the phase error signal supplied from the register 26a, and to output it to the adder 28.

The frequency detection circuit 32 detects the frequency of the wobble binarized signal supplied from the comparator 23, and outputs the frequency detection signal (frequency detection value) to the frequency fluctuation detection circuit (control means) 33 and the switch 25b. Is output to the register (frequency storage means) 26b via the.

The register 26b stores the frequency detection signal supplied from the frequency detection circuit 32 when the switch 25b is closed, and outputs the signal to the LPF 27b and the frequency fluctuation detection circuit 33.
The register 26b is configured to keep storing the frequency detection signal (frequency storage value) stored immediately before, without updating the content when the switch 25b is opened.

The LPF 27b generates a VCO frequency control signal by limiting the frequency of the frequency detection signal supplied from the register 26b,
Is configured to be output.

The frequency fluctuation detection circuit 33 compares the frequency detection signal supplied from the frequency detection circuit 32 with the frequency detection signal supplied from the register 26b, and judges the difference signal (difference) and the frequency fluctuation. The switches 25a and 25b are controlled based on the result of comparison with a threshold value (set value).

The above-mentioned threshold value for determining the frequency fluctuation is supplied from the microcomputer 34. The threshold value of the frequency fluctuation determination threshold is the data area Ds of the optical pickup 13 of the frequency of the wobble detection signal.
This serves as a criterion for detecting a large change due to the movement from to the header area Hs.

That is, while the optical pickup 13 is reading the data area Ds, the frequency of the wobble detection signal does not change so much.
The phase error signal supplied from the phase comparison circuit 24 and the frequency detection signal supplied from the frequency detection circuit 32 via the registers 26a and 26b
Is stored in each. Thus, during the reading period of the data area Ds, the phase error signal (specific value) in the registers 26a and 26b which are sequentially updated.
The VCO 29 reproduces a wobble reproduction signal based on the frequency detection signal.

On the other hand, the reading of the optical pickup 13 shifts to the header area Hs, and during the reading of the header area Hs, the optical pickup 13
The frequency of the wobble detection signal greatly changes compared to the period during which the data area Ds is read. Therefore, when the magnitude of the fluctuation of the frequency of the wobble detection signal is detected by comparison with the frequency fluctuation determination threshold value, the switches 25a and 25b are opened by the frequency fluctuation detection circuit 33 and supplied from the phase comparison circuit 24. Update of the contents of the registers 26a and 26b by the phase error signal and the frequency detection signal supplied from the frequency detection circuit 32 is prevented. Thus, during the period when the optical pickup 13 is reading the header area Hs, the VCO 2 is read based on the phase error signal and the frequency detection signal already stored in the registers 26a and 26b, respectively.
9, the wobble reproduction signal is reproduced.

The adder 28 adds the VCO phase control signal supplied from the LPF 27a and the VCO frequency control signal supplied from the LPF 27b, and
9 is configured to generate a VCO control signal for controlling the VCO 9.

The VCO 29, which is a voltage-controlled oscillator, oscillates in response to the VCO control signal supplied from the adder 28, and outputs its output (PLL-locked wobble reproduction signal) to the phase comparison circuit 24 and the timing circuit. 3
It is configured to output 0.

The timing circuit 30 generates a timing signal for reproducing header data based on the PLL-locked wobble reproduction signal (reference signal) supplied from the VCO 29 and outputs the timing signal to the recording / reproduction circuit 31. It is configured to be.

The recording / reproducing circuit 31 outputs the R signal based on the timing signal supplied from the timing circuit 30.
It is configured to reproduce data to be reproduced from the RF signal supplied from the F amplifier 14 and output the data to a system control unit (not shown) that controls each circuit (unit). The recording / reproducing circuit 31 outputs data to be written on the optical disc 100, which is supplied from the system control unit, to the RF amplifier 14 based on the timing signal supplied from the timing circuit 30. Is configured.

In the case of this optical disk device, the phase comparison circuit 24, the switch 25a, the register 26a,
The LPF 27a and the VCO 29 constitute a known PLL circuit. The optical pickup 13 is used by the optical pickup 13 by the PLL circuit.
00, a continuous wobble reproduction signal is reproduced based on the wobble detection signal read from above.

Next, an operation for reproducing a wobble reproduction signal in the optical disk device having the above-described configuration will be described.

In advance, the microcomputer 34
Thereby, the frequency variation determination threshold value of the frequency variation detection circuit 33 is set. At this time, as the frequency variation determination threshold, for example, the frequency of the wobble detection signal (wobble binary signal) during the period when the optical pickup 13 is reading the data area Ds, and the optical pickup 13
Is set to a predetermined value that is less than the difference from the frequency of the wobble detection signal during the period when the header area Hs is being read.

Thereafter, the track T on the optical disc 100
The wobble reproduction signal is reproduced in accordance with the operation of reading data already recorded in the data area Ds or the operation of writing data to be recorded in the data area.

For example, a wobble is recorded on a track T corresponding to the data area Ds of the optical disc 100. Therefore, the optical pickup 13 is moved to the data area Ds.
During the period in which is read, the frequency of the wobble detection signal does not change so much. Therefore, the magnitude of the fluctuation due to the comparison between the frequency of the frequency detection signal supplied from the frequency detection circuit 32 and the frequency of the frequency detection signal already stored in the register 26b is, of course,
It becomes smaller than the frequency fluctuation determination threshold set by the computer 34.

On the other hand, the header area Hs of the optical disc 100
No wobble is recorded on the track T corresponding to. Therefore, the optical pickup 13 has the header area Hs
As soon as the reading of the data is started, the frequency of the wobble detection signal changes greatly. Therefore, the frequency detection circuit 32
The magnitude of the fluctuation by comparing the frequency of the frequency detection signal supplied from the frequency detection signal with the frequency of the frequency detection signal already stored in the register 26b is, of course, the frequency fluctuation determination threshold set by the microcomputer 34. Greater than the value.

That is, the frequency detection signal detected by the frequency detection circuit 32 is sent to the switch 25b and the frequency fluctuation detection circuit 33. Normally, the switch 25
Both a and 25b are closed, and the phase error signal supplied from the phase comparison circuit 24 and the frequency detection signal supplied from the frequency detection circuit 32 are stored in registers 26a and 26b, respectively.

The frequency detection signal already stored in the register 26b is
At 3, the frequency is compared with a frequency detection signal newly supplied from the frequency detection circuit 32.

The difference signal is compared with a frequency fluctuation determination threshold value. For example, during the period when the optical pickup 13 is reading the data area Ds, the difference signal is smaller than the frequency fluctuation determination threshold. In that case,
The switches 25a, 2
5b are both controlled to maintain a closed state.

Thus, during the reading period of the data area Ds, the contents of the registers 26a and 26b are sequentially updated by the phase error signal and the frequency detection signal supplied from the phase comparison circuit 24 and the frequency detection circuit 32, respectively. You. Then, the updated register 2
A wobble reproduction signal is reproduced by the VCO 29 based on the phase error signal and the frequency detection signal in 6a and 26b.

On the other hand, when the optical pickup 13 enters the reading period of the header area Hs, the frequency detection signal already stored in the register 26b and the frequency detection circuit 32
The difference signal from the frequency detection signal newly supplied from is larger than the frequency fluctuation determination threshold value. In that case, the switches 25a, 25
b are controlled to open together.

This prevents the contents of the registers 26a and 26b from being updated, and maintains the contents of the registers 26a and 26b. As a result, during the reading period of the header area Hs, the wobble reproduction in the VCO 29 is performed based on the phase error signal and the frequency detection signal already stored in the registers 26a and 26b during the reading period of the data area Ds. Signal reproduction (oscillation by a constant VCO control signal) is performed.

Thereafter, when the optical pickup 13 exits the reading period of the header area Hs, the difference signal between the frequency detection signal already stored in the register 26b and the frequency detection signal newly supplied from the frequency detection circuit 32. Becomes smaller than the frequency variation determination threshold. In that case, the frequency fluctuation detection circuit 33 controls again to close both the switches 25a and 25b.

As described above, during the reading period of the header area Hs where no wobble is recorded, based on the immediately preceding phase error signal and frequency detection signal,
The VCO 29 is caused to oscillate at a constant frequency. Thus, a stable operation can be performed even during the reading period of the header area Hs. Therefore, a continuous wobble reproduction signal can be easily reproduced.

As described above, during the reading period of the header area, the VCO control signal can be complemented by the immediately preceding wobble detection signal.

That is, when a change in the frequency of the wobble signal is detected, the frequency and phase difference of the wobble signal immediately before the change can be held. This makes it possible to improve the frequency and phase difference of the wobble signal during the reading period of the header area from greatly changing before and after that period. Therefore, the wobble reproduction signal can be reproduced stably even during the reading period of the header area.

In particular, since a stable operation can be performed even during the reading period of the header area, the wobble detection signal can be quickly pulled into the PLL operation immediately after the reading period of the header area. Things.

In the first embodiment described above, a case has been described as an example in which the fluctuation of the frequency of the wobble detection signal is detected during the reading period of the header area. However, the present invention is not limited to this. It is also possible to detect the fluctuation of the frequency for reasons other than the above, and similarly control the oscillation of the VCO.

Further, the present invention is not limited to the case where the phase error signal and the frequency detection signal are respectively stored in the registers as in the optical disk device shown in the first embodiment. You may comprise.

(Second Embodiment) FIG. 3 shows a second embodiment of the present invention.
1 shows a configuration example of an optical disk device (DVD-RAM disk drive) according to the embodiment. The same parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description is omitted.

In the case of this optical disk device, for example, when the fluctuation of the frequency of the wobble detection signal exceeds the frequency fluctuation judgment threshold value during the reading period of the header area Hs, the switch 25b is opened to open the frequency detection circuit. In addition to preventing the frequency detection signal supplied from 32 from being stored in the register 26, a predetermined (fixed) phase preset in the phase register (phase difference storage means) 41 in response to the switching of the switch 25a '. The signal (arbitrary phase difference stored value) is configured to be output to the LFP 27a.

Therefore, during the reading period of the header area Hs, the VCO control signal supplied to the VCO 29 is
The VCO phase control signal whose frequency is limited by the LPF 27a from the phase signal supplied from the phase register 41 via the switch 25a ', and the frequency is limited by the LPF 27b of the frequency detection signal supplied from the register 26. The VCO frequency control signal is generated by being added by an adder 28.

As described above, when the variation of the frequency of the wobble detection signal exceeds the frequency variation determination threshold, the VCO
Even in a configuration in which the phase control signal is fixed by a predetermined phase signal, it is possible to prevent the VCO control signal from largely deviating from a specific frequency.

The above-mentioned predetermined phase signal includes:
For example, by the microcomputer 34,
What is necessary is just to set an appropriate value.

(Third Embodiment) FIG. 4 shows a third embodiment of the present invention.
1 shows a configuration example of an optical disk device (DVD-RAM disk drive) according to the embodiment. Here, a case will be described as an example where a VCO 29 ′ having a characteristic whose oscillation range is narrower than that of the VCO 29 used in the first and second embodiments is used. The same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description is omitted.

In the case of this optical disc apparatus, for example, when the fluctuation of the frequency of the wobble detection signal exceeds the frequency fluctuation judgment threshold value during the reading period of the header area Hs, the switch 25a is opened and the phase comparison circuit is opened. Register for phase error signal supplied from 24 (phase difference storage means)
26a is prevented from being stored in this register 2a.
The VCO control signal is generated based on the immediately preceding phase error signal (phase difference stored value) already stored in 6a.

Such a VC having a narrow oscillation range
In the case of an optical disc device provided with O29 ', it is possible to realize a PLL operation for reproducing a wobble reproduction signal only with a phase error signal without using a frequency detection signal. In this case, the configuration can be greatly simplified by limiting the oscillation range as compared with the optical disk device shown in the first embodiment.

(Fourth Embodiment) FIG. 5 shows a fourth embodiment of the present invention.
1 shows a configuration example of an optical disk device (DVD-RAM disk drive) according to the embodiment. Here, in the optical disk device shown in the second embodiment, like the optical disk device shown in the third embodiment,
An example will be described in which a VCO 29 'having a narrow oscillation range is used. The same reference numerals are given to the same parts as those in FIGS.

In the case of this optical disc device, for example, when the fluctuation of the frequency of the wobble detection signal exceeds the frequency fluctuation judgment threshold value during the reading period of the header area Hs, the switching of the switch 25a 'is performed. Based on a predetermined phase signal (arbitrary phase difference storage value) preset in a phase register (phase difference storage means) 41, VC
An O control signal is configured to be generated.

The above-mentioned predetermined phase signal includes:
For example, by the microcomputer 34,
What is necessary is just to set an appropriate value.

VC having such a characteristic that the oscillation range is narrow
In the case of an optical disc device provided with O29 ', it is possible to realize a (PLL) operation for reproducing a wobble reproduction signal using only a phase error signal or a predetermined phase signal without using a frequency detection signal. is there. Also in this case, almost in the same manner as in the third embodiment,
By limiting the range of oscillation as compared with the optical disk device shown in the first embodiment, the configuration can be greatly simplified.

Further, in any of the embodiments, the present invention is not limited to the optical disk device, but can be applied to, for example, a magneto-optical disk device.

In addition, it goes without saying that various modifications can be made without departing from the spirit of the present invention.

[0089]

As described above, according to the present invention, the wobble reproduction signal can be stably reproduced even during the reading period of the header area, and the wobble detection signal immediately after the reading period of the header area can be obtained. And a control circuit device used for the information recording device, which can promptly pull in the PLL operation.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram schematically showing a configuration of a main part of an optical disk device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram for explaining an outline of an optical disk.

FIG. 3 is a circuit block diagram schematically showing a configuration of a main part of an optical disc device according to a second embodiment of the present invention.

FIG. 4 is a circuit block diagram schematically showing a configuration of a main part of an optical disc device according to a third embodiment of the present invention.

FIG. 5 is a circuit block diagram schematically showing a configuration of a main part of an optical disc device according to a fourth embodiment of the present invention.

FIG. 6 is shown to explain the prior art and its problems;
FIG. 2 is a circuit block diagram of the optical disk device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Optical disk drive part 2,21,22,23 ... Control circuit part 11 ... Disk motor 12 ... Driver amplifier 13 ... Optical pickup 14 ... RF amplifier 21 ... Servo control circuit 22 ... BPF 23 ... Comparator 24 ... Phase comparison circuit 25a, 25a ', 25b switch 26, 26a, 26b register 27, 27a, 27b LPF 28 adder 29, 29' VCO 30 timing circuit 31 recording / reproducing circuit 32 frequency detection circuit 33 frequency fluctuation detection Circuit 34 Microcomputer 41 Phase register T Track Tg Groove track Tr Land track Z0-Zn Zone S Sector Hs Header area Hs1, Hs2, Hs3, Hs4 Header Ds Data area 100 Optical disk

Claims (20)

[Claims] 1. A frequency detecting means for optically reading from a recording medium in which a guide meandering groove is provided intermittently to detect a frequency of the meandering groove read signal, and stores a frequency detection value by the frequency detecting means. Frequency storage means, and control for controlling storage of a frequency detection value by the frequency detection means in the frequency storage means based on a difference between a frequency storage value in the frequency storage means and a frequency detection value by the frequency detection means. Means for controlling a control signal of an oscillator for outputting a reproduction signal corresponding to the meandering groove read signal from a frequency storage value and a specific value in the frequency storage means under the control of the control means. A control circuit device characterized by generating. 2. A frequency detecting means for optically reading from a recording medium provided with a guide meandering groove intermittently, for detecting a frequency of the meandering groove read signal, and storing a frequency detection value by the frequency detecting means. Frequency storage means, and control for controlling storage of a frequency detection value by the frequency detection means in the frequency storage means based on a difference between a frequency storage value in the frequency storage means and a frequency detection value by the frequency detection means. Means for generating a control signal of an oscillator for outputting a reproduction signal corresponding to the meandering groove read signal from a specific value under the control of the control means. 3. The control means compares a difference between a frequency stored value in the frequency storage means and a frequency detection value by the frequency detection means with a set value, and switches the switch when the difference exceeds the set value. 3. The storage of the frequency detection value by the frequency detection means in the frequency storage means is prohibited by switching the frequency.
3. The control circuit device according to 1. 4. The specific value is detected by a phase difference detecting means for detecting a phase difference between a phase of the meandering groove read signal and an output of the oscillator, and stores a phase difference detected value by the phase difference detecting means. 3. A phase difference stored value stored in a phase difference storage means.
3. The control circuit device according to 1. 5. The control circuit device according to claim 4, wherein the storage of the phase difference detection value by said phase difference detection means in said phase difference storage means is controlled by said control means. 6. The control means compares a difference between a frequency stored value in the frequency storage means and a frequency detected value by the frequency detection means with a set value, and switches the switch when the difference exceeds the set value. 6. The control circuit device according to claim 5, wherein by switching the phase difference storage means, the storage of the phase difference detection value by the phase difference detection means in the phase difference storage means is prohibited. 7. The phase difference detection value detected by a phase difference detection means for detecting a phase difference between the phase of the meandering groove read signal and the output of the oscillator, or a value stored in a phase difference storage means. The control circuit device according to claim 1 or 2, wherein the stored value is an arbitrary stored phase difference value. 8. The phase difference detection value detected by the phase difference detection means and the phase difference storage value stored in the phase difference storage means under the control of the control means. The control circuit device according to claim 7, wherein one of the control circuit devices is selected. 9. The control means compares a difference between a frequency stored value in the frequency storage means and a frequency detection value by the frequency detection means with a set value, and switches the switch when the difference exceeds the set value. By switching the phase difference detection value detected by the phase difference detection means and the phase difference storage value stored in the phase difference storage means as the specific value. The control circuit device according to claim 8. 10. The oscillator according to claim 1, wherein a part of a PLL circuit is constituted by the oscillator.
3. The control circuit device according to 1. 11. A rotating means for rotating a recording medium provided with intermittent guide grooves along an information recording track, and optically reading the guide serpentine grooves from above the recording medium to produce an electric signal. Reading means for converting; frequency detecting means for detecting the frequency of the meandering groove read signal output from the reading means; frequency storing means for storing a frequency detected value by the frequency detecting means; and frequency in the frequency storing means. Control means for controlling storage of a frequency detection value by the frequency detection means in the frequency storage means based on a difference between a stored value and a frequency detection value by the frequency detection means; and writing / reading of information to / from the recording medium Recording / reproducing means for performing the following. Under the control of the control means, a frequency storage value in the frequency storage means and An information recording device for generating a control signal of an oscillator for outputting a reproduction signal corresponding to the meandering groove read signal from a specific value. 12. A rotating means for rotating a recording medium provided with guide meandering grooves intermittently along a recording track of information, and optically reading the guide meandering grooves from above the recording medium to produce an electric signal. Reading means for converting; frequency detecting means for detecting the frequency of the meandering groove read signal output from the reading means; frequency storing means for storing a frequency detected value by the frequency detecting means; and frequency in the frequency storing means. Control means for controlling storage of a frequency detection value by the frequency detection means in the frequency storage means based on a difference between a stored value and a frequency detection value by the frequency detection means; and writing / reading of information to / from the recording medium Recording / reproducing means for performing the following. Under the control of the control means, from a specific value, An information recording apparatus for generating an oscillator control signal for outputting a corresponding reproduction signal. 13. The control means compares a difference between a frequency stored value in the frequency storage means and a frequency detection value by the frequency detection means with a set value, and switches the switch when the difference exceeds the set value. 13. The information recording apparatus according to claim 11, wherein switching of the frequency storage means inhibits storage of a frequency detection value by the frequency detection means in the frequency storage means. 14. The specific value is detected by phase difference detecting means for detecting a phase difference between the phase of the meandering groove read signal and the output of the oscillator, and stores the phase difference detected value by the phase difference detecting means. 13. The information recording apparatus according to claim 11, wherein the information recording value is a phase difference stored value stored in the phase difference storing means. 15. The information recording apparatus according to claim 14, wherein the storage of the phase difference detection value by the phase difference detection means in the phase difference storage means is controlled by the control means. 16. The control means compares a difference between a frequency stored value in the frequency storage means and a frequency detection value by the frequency detection means with a set value, and switches the switch when the difference exceeds the set value. 16. The information recording apparatus according to claim 15, wherein by switching the phase difference storage unit, the storage of the phase difference detection value by the phase difference detection unit in the phase difference storage unit is prohibited. 17. The phase difference detection value detected by phase difference detection means for detecting a phase difference between a phase of the meandering groove read signal and an output of the oscillator, or
13. The information recording apparatus according to claim 11, wherein the information recording value is an arbitrary phase difference stored value stored in the phase difference storing means. 18. The method according to claim 18, wherein the specific value is a value of a phase difference detection value detected by the phase difference detection means and a phase difference storage value stored in the phase difference storage means, based on the control of the control means. 18. The information recording apparatus according to claim 17, wherein any one is selected. 19. The control means compares a difference between a frequency stored value in the frequency storage means and a frequency detection value by the frequency detection means with a set value, and switches the switch when the difference exceeds the set value. By switching the phase difference detection value detected by the phase difference detection means and the phase difference storage value stored in the phase difference storage means as the specific value. The information recording device according to claim 18. 20. The information recording apparatus according to claim 11, wherein a part of a PLL circuit is constituted by said oscillator.