JP2002358657A - Optical disk and optical disk drive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk on which a wobble made to meander continuously by a signal which is formed by placing a plurality of different frequency signals one upon another, is formed, and to provide an optical disk drive. SOLUTION: The optical disk 1 is provided with a groove meandering continuously by a wobble signal which is formed by placing different frequency signals one upon another. The optical disk drive reads the wobble signal in the optical disk 1 with an optical head 3, and supplies it to a recording and reproducing circuit 5. The recording and reproducing circuit 5 supplies the wobble signal to a first wobble bandpass filter 6 and a second wobble bandpass filter 7 to detect a first and a second wobble signals. A clock generating circuit 8 and a PLL circuit 10 generate a clock from the first wobble signal, and supply it to a control circuit 4 and the recording and reproducing circuit 5. An address detecting circuit 9 detects an address from a second wobble signal. Accordingly, the recording control of the optical disk 1, the rotation control of a spindle motor 2, and the detection of the address can be carried out using the wobble signals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk and an optical disk device, and more particularly, to an optical disk having a wobble and an optical disk device.

[0002]

2. Description of the Related Art In recent years, large-capacity optical disk media have become increasingly narrower in pitch and smaller in pits, or between a guide groove (groove portion) and a guide groove (land portion) as the storage capacity has increased.
As a method of further increasing the recording density from a system using both of them as information tracks, a method of wobbling between a groove portion and a land portion to have various information therein is used. The wobbles are used as address information and synchronization signals.

[0003] As shown in FIG. 4, the method of providing address information is to frequency-modulate the frequency (A) of a fixed period of the basic wobble (B), shift the phase by 180 degrees (C), Alternatively, Pre-Pit is formed in the land portion (D), and the address is recognized by identifying whether the data is “1” or “0”.

As a synchronizing signal, a clock synchronized with the wobble is generated by applying a PLL to synchronize the rotation of the spindle with the wobble cycle, or is used as a recording / reproducing clock to record data on the optical disc with data having a constant Pit length. Or let them do it.

[0005] As another method, a synchronization mark is multiplexed on a wobble to perform registration of recording data. The address information and the synchronization signal enable the signal to be recorded at an arbitrary position on the disk.

Another wobble configuration is disclosed in
As disclosed in Japanese Patent Publication No. -285468, a configuration is shown in which a second wobble having a higher frequency than the first wobble is superimposed on the first wobble. In this superimposition method, the second wobble is intermittently superimposed during one cycle of the first wobble. This second wobble indicates that it is an address mark, and the above-mentioned Land-Pre-
The signal such as Pit is identified, and the address is detected. Similarly to the first wobble, the rotation of the spindle and the use as a recording / reproducing clock are performed from the first wobble.

[0007]

However, in the above-mentioned conventional method, an address can be obtained, but the read time requires a time equal to the wobble period × the number of bits, so that the wobble has more information. There was a problem that it could not be done.

Further, recording on the optical disk is performed by CLV (constant linear velocity method), and reproduction is performed by CAV (constant angular velocity method).
In the case of performing in a zone CLV (ZCLV: a combination of a constant linear velocity method and a constant angular velocity method), there is a problem that an apparatus having these methods must be prepared.

An object of the present invention is to provide an optical disk and an optical disk apparatus capable of having more information by using wobbles formed by continuously superposing a plurality of signals in different frequency bands. is there.

[0010]

According to an aspect of the present invention, there is provided a wobble which is continuously meandered on the basis of a signal in which a plurality of different frequency signals are superimposed in a track lateral direction. It is characterized by having done.

According to a second aspect of the present invention, in the first aspect, at least one of the plurality of different frequency signals is modulated so as to indicate predetermined information.

According to a third aspect of the present invention, in the second aspect, the predetermined information is various information including address information and a set value.

According to a fourth aspect of the present invention, in the first aspect of the invention, the plurality of different frequency signals are CLV (constant linear velocity), CAV (constant angular velocity), ZCLV (Combination of a constant linear velocity method and a constant angular velocity method) or a combination thereof.

According to a fifth aspect of the present invention, there is provided a rotating means for rotating an optical disk having a wobble continuously meandering based on a signal in which a plurality of different frequency signals are superimposed in a track lateral direction, and a rotating means for rotating the optical disk. Reading means for reading a wobble signal from the read optical disk, first extracting means for extracting a first frequency signal from the wobble signal read by the reading means, and a first frequency signal extracted by the first extracting means. It is characterized by comprising a generating means for generating a clock signal, and first control means for controlling rotation of the optical disk by the rotating means using the clock signal generated by the generating means.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, recording on the optical disk is controlled by the recording means for recording on the optical disk and the clock signal generated by the generating means. And second control means.

The invention according to claim 7 is the invention according to claim 5 or 6.
The invention described in the above description is characterized by including a detecting means for detecting various information including address information and a set value from the first frequency signal extracted by the first extracting means.

The invention according to claim 8 is the invention according to claim 5 or 6.
In the invention described above, a second extracting means for extracting a second frequency signal from the wobble signal read by the reading means, and various information including address information from the second frequency signal extracted by the second extracting means And a detecting means for detecting a set value.

According to a ninth aspect of the present invention, there is provided a rotating means for rotating an optical disk having a wobble continuously meandering on the basis of a signal in which a plurality of different frequency signals are superimposed in a track lateral direction, and a rotating means for rotating the optical disk. Reading means for reading a wobble signal from the read optical disc, recording means for recording on the optical disc, first extracting means for extracting a first frequency signal from the wobble signal read by the reading means, and first extracting means Generating means for generating a first clock signal from the first frequency signal extracted by the method, and controlling the rotation of the optical disk by the rotating means using the first clock signal generated by the first generating means. First extracting means for extracting a second frequency signal from the wobble signal read by the reading means, and a second extracting means. Detecting means for detecting various types of information including address information and setting values from the second frequency signal extracted by the detecting means; third extracting means for extracting a third frequency signal from the wobble signal read by the reading means; Third
From the third frequency signal extracted by the extracting means
Second generating means for generating a clock signal of the second type, and second control means for controlling recording on the optical disk by the recording means using the second clock signal generated by the second generating means. It is characterized by.

The invention according to claim 10 is the invention according to claims 5 to 9
In the invention described in any one of the above, the plurality of different frequency signals are any of CLV (constant linear velocity method), CAV (constant angular velocity method), ZCLV (combination of constant linear velocity method and constant angular velocity method), Alternatively, it is characterized in that it is configured for recording and reproduction by a combination of these.

<Operation> In the optical disk and the optical disk apparatus of the present invention, a clock generation circuit and a PL are used for the first wobble signal obtained from the first wobble bandpass filter.
The PLL is applied by the L circuit, the rotation of the disk is controlled by the control circuit, and the recording process is performed by the recording / reproducing circuit. Further, the address detection circuit detects address information from the second wobble signal obtained from the second wobble bandpass filter.

In the optical disk and the optical disk apparatus according to the present invention, a clock generation circuit or a second wobble signal obtained from the first wobble bandpass filter or the second wobble signal obtained from the second wobble bandpass filter is used. The clock generation circuit and the PLL circuit apply PLL, the control circuit controls the rotation of the optical disk, and the recording / reproducing circuit performs recording processing. Further, an address detection circuit detects address information from each of the first wobble signal and the second wobble signal.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an optical disc and an optical disc apparatus according to embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 to 3 show an embodiment of an optical disk and an optical disk apparatus according to the present invention.

<First Embodiment> FIG. 1 shows a first embodiment of the present invention.
1 is a block diagram illustrating a schematic configuration of an optical disc device according to an embodiment. In FIG. 1, an optical disk device according to a first embodiment of the present invention includes a spindle motor 2 for rotating an optical disk 1, an optical head 3 for reading / writing the optical disk 1, a control circuit 4, and a recording / reproducing circuit 5.
, A first wobble bandpass filter 6, a second wobble bandpass filter 7, a clock generation circuit 8, an address detection circuit 9, and a PLL circuit 10.

The optical disc 1 is an optical recording medium in which a groove is formed in which a plurality of different frequency signals are continuously meandered (wobbled) based on a signal obtained by superimposing a first wobble signal and a second wobble signal. is there.

The spindle motor 2 rotates the optical disc 1 at a predetermined rotation speed based on a control signal from the control circuit 4. The optical head 3 irradiates a laser beam to the optical disc 1 to record data, and reproduces data from the reflected light.

The control circuit 4 includes a clock circuit 8 and a PLL.
The rotation of the spindle motor 2 is controlled using the clock signal generated by the circuit 10.

The recording / reproducing circuit 5 converts the signal reproduced by the optical head 3 into a first wobble bandpass filter 6 and a second
The wobble signal is supplied to the wobble bandpass filter 7, and each filter passes only the wobble signal having the respective frequency band.

The clock generation circuit 8 and the PLL circuit 9
A clock signal is generated by using the first wobble signal passed through the first wobble band-pass filter 6 and supplied to the control circuit 4 as a clock for controlling the rotation of the spindle motor 2, and the optical head 3 transmits to the recording / reproducing circuit 5. It is supplied as a clock for recording control.

The address detection circuit 10 detects and outputs address information from the second wobble signal passed through the second wobble band-pass filter 7.

According to the first embodiment of the present invention, a first wobble signal having passed through a filter is converted from a wobble signal in which a plurality of different frequency signals (a first wobble signal and a second wobble signal) are continuously superimposed. To generate a clock signal for rotation control and recording control, and to detect address information using the second wobble signal.

<Second Embodiment> FIG. 2 shows a second embodiment of the present invention.
1 is a block diagram illustrating a schematic configuration of an optical disk and an optical disk device according to an embodiment. In FIG. 2, an optical disc device according to a second embodiment of the present invention includes an optical disc 1
A spindle motor 2 for rotating the optical disk 1, an optical head 3 for reading / writing the optical disk 1, a control circuit 4,
Recording / reproducing circuit 5 and first wobble bandpass filter 6
, A second wobble bandpass filter 7, a clock generation circuit 8a, a clock generation circuit 8b, an address detection circuit 9a, an address detection circuit 9b, and a PLL circuit 10.
And is configured.

In the second embodiment of the present invention, the first
Similarly to the first embodiment, a groove is formed on the optical disc 1 by continuously wobbling based on a signal obtained by superimposing a plurality of different frequency signals. The wobble signal (superimposed signal) of the optical disk 1 read by the optical head 3 is supplied to the first wobble bandpass filter 6 and the second wobble bandpass filter 6.
The wobble bandpass filter 7 detects only wobble signals (first and second) having respective frequency bands.

The first wobble signal obtained by the first wobble band-pass filter 6 is supplied to a clock generation circuit 8a and is also supplied to an address detection circuit 9a to detect address information (address output a).

The second wobble signal obtained by the second wobble band-pass filter 7 is supplied to a clock generation circuit 8b and also to an address detection circuit 9b to detect address information (address output b).

The PLL circuit 10 includes a clock generation circuit 8a
A clock signal is generated using the first wobble signal and the second wobble signal together with the clock generation circuit 8b and supplied to the recording / reproduction circuit 5 as a recording clock and to the control circuit 4 as a rotation control clock.

According to the second embodiment of the present invention, the recording / reproducing circuit 5 uses the first wobble signal and the second wobble signal.
In this case, it is possible to generate a clock signal for controlling the rotation of the spindle motor 2 and to detect the address information.

FIG. 3 is a diagram showing a frequency relationship of a wobble signal in the embodiment of the present invention. FIG.
FIG. 3A shows the waveform of the first wobble signal, and FIG.
FIG. 3C shows a waveform of a second wobble signal higher than the frequency of the wobble signal, and FIG. 3C shows a waveform of a signal obtained by superimposing the first wobble signal and the second wobble signal.

The signals read by the optical head 3 include:
In addition to the recorded data, the first wobble signal and the second wobble signal
A wobble signal is superimposed. Since the frequencies of these wobble signals are known from the disk configuration in advance, it is possible to extract each wobble signal by providing a bandpass filter that allows only the respective frequency bands to pass therethrough, as shown in FIGS. The waveform shown in B) can be obtained.

The frequency bands of these wobble signals are not approximate to each other, but need only be separated to the extent that they can be separated by their respective band-pass filters. Is sufficiently lower than the frequency.

Here, the first wobble signal has a fixed period, and a clock signal synchronized with the optical disk can be generated by applying a PLL based on this. Thus, the rotation of the spindle motor 2 can be locked to the cycle of the optical disk. In addition, since it can be used as a recording clock, it is possible to perform recording locked to the wobble signal on an optical disk that rotates while locking to the wobble signal, and it is possible to record data with a fixed pit length on the optical disk. Become.

Also, address information and the like can be embedded in the second wobble signal. Conventionally, the address information may be provided by frequency-modulating the frequency of a fixed period of the basic wobble signal, shifting the phase by 180 degrees, or using other methods to make the data “1” or “0”.
Was identified and the address was recognized.

The second wobble signal is higher in frequency than the first wobble signal. Conventionally, one bit of one cycle of the first wobble signal is 1 bit. Can be. Thus, the optical disk can have a large number of bits, that is, a large amount of information, while having the same configuration as the conventional one. For example, an address can be obtained in a short period of time, and further, it is possible to attach a parity to the address, and to configure various other information such as disk information. Note that a configuration in which the relationship between the first wobble signal and the second wobble signal is reversed is also possible.

<Other Embodiment> As another embodiment of the present invention, any one wobble signal (only the first wobble signal) is used among the wobble signals in which a plurality of signals in different frequency bands are superimposed. Thus, it is also possible to perform rotation control of the spindle motor, recording control, and detection of address information. In this case, in order to embed address information in one wobble signal, it is necessary to perform FM modulation or shift the phase, and the cycle is not constant.

Further, not only the first wobble signal but also the second wobble signal have the same configuration, and the second wobble signal is superimposed on the first wobble signal to form a continuous wobble. However, the original waveform can be restored by passing both the first wobble signal and the second wobble signal through a band-pass filter that passes each frequency band.

The method of using such a wobble signal is, for example, that the first wobble signal passed through the first wobble band-pass filter 6 at the time of CLV recording / reproduction and the second wobble band-pass filter 7 passed at the time of CAV recording / reproduction. It is preferable to control the rotation of the spindle motor, control the recording, and detect the address information from the two wobble signals.

From this, one disk and one disk
One device can support both the CLV method and the CAV method, and the ZCLV method can be supported in the same manner. In addition, by changing the combination and the relationship between them and using a disk corresponding to the device, the system configuration can be simplified.

The above embodiment is a preferred embodiment of the present invention, and can be variously modified and implemented without departing from the gist of the present invention. For example,
It is also possible that the second wobble signal is higher in frequency than the first wobble signal and has more information than the first wobble signal. This makes it possible to add parity in addition to address information, and to embed various types of information such as disk format type, recording power, recording wavelength, write strategy method, or copy management as disk information. .

In the embodiment of the present invention, the address information to be embedded in the wobble signal may be configured to have a double or triple configuration, and one having no error may be selected and used.

Also, in the embodiment of the present invention, two types of signals, that is, a first wobble signal and a second wobble signal, are formed. Similarly, third and fourth wobble signals are formed and superimposed. By providing a band-pass filter that allows each wobble signal to pass, more information can be stored on the optical disc. Based on each wobble signal, the rotation control of the spindle motor, the recording control, and the detection of address information are performed. It is also possible to do.

Further, in the embodiment of the present invention, the second
By making the wobble signal exactly the same as the first wobble signal, it is possible to use information obtained from a more stable signal after passing through each band-pass filter. , It is possible to select and use an error-free wobble signal.

[0051]

As is apparent from the above description, according to the present invention, more information can be obtained by forming a wobble that is continuously meandered using a signal in which a plurality of different frequency signals are superimposed. An optical disk provided can be provided.

According to the present invention, a frequency signal used for rotation control, recording control, and detection of address information can be respectively extracted from a wobble signal on which a plurality of different frequency signals are superimposed. It is possible to provide an optical disk device that is not affected by the above, and to shorten the reading time.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration of an optical disc and an optical disc apparatus according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a schematic configuration of an optical disc and an optical disc apparatus according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a frequency relationship of a wobble signal in the embodiment of the present invention.

FIG. 4 is a diagram showing how address information is provided;

[Explanation of symbols]

 Reference Signs List 1 optical disk 2 spindle motor 3 optical head 4 control circuit 5 recording / reproducing circuit 6 first wobble bandpass filter 7 second wobble bandpass filter 8 clock generation circuit 9 address detection circuit 10 PLL circuit

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Claims (10)

[Claims] 1. An optical disk, wherein a wobble continuously meandering is formed based on a signal in which a plurality of different frequency signals are superimposed in a track lateral direction. 2. The optical disc according to claim 1, wherein at least one of the plurality of different frequency signals is modulated so as to indicate predetermined information. 3. The optical disk according to claim 2, wherein the predetermined information is various information including address information and a set value. 4. The plurality of different frequency signals are any of CLV (constant linear velocity method), CAV (constant angular velocity method), ZCLV (combination of constant linear velocity method and constant angular velocity method), or a combination thereof. The optical disc according to any one of claims 1 to 3, wherein the optical disc is configured for recording / reproduction by a combination. 5. A rotating means for rotating an optical disk having a wobble continuously meandering based on a signal in which a plurality of different frequency signals are superimposed in a track lateral direction, and a wobble from the optical disk rotated by the rotating means. Reading means for reading a signal; first extracting means for extracting a first frequency signal from the wobble signal read by the reading means; and a signal from the first frequency signal extracted by the first extracting means. An optical disc device comprising: a generating unit that generates a clock signal; and a first control unit that controls rotation of the optical disc by the rotating unit using the clock signal generated by the generating unit. 6. A recording unit for recording on the optical disk, and a second control unit for controlling recording on the optical disk by the recording unit using the clock signal generated by the generation unit. 6. The optical disk device according to claim 5, wherein: 7. Various information including address information from the first frequency signal extracted by the first extraction means,
7. The optical disk device according to claim 5, further comprising a detection unit that detects a set value. 8. A second extracting means for extracting a second frequency signal from the wobble signal read by the reading means, and address information from the second frequency signal extracted by the second extracting means. The optical disk device according to claim 5, further comprising: a detection unit configured to detect various types of information and setting values including the following. 9. A rotating means for rotating an optical disk having a wobble continuously meandering based on a signal in which a plurality of different frequency signals are superimposed in a track lateral direction; and a wobble from the optical disk rotated by the rotating means. Reading means for reading a signal; recording means for recording on the optical disc; first extracting means for extracting a first frequency signal from the wobble signal read by the reading means; and first extracting means A first generation unit that generates a first clock signal from the first frequency signal extracted by the first unit, and the first rotation unit that uses the first clock signal generated by the first generation unit. First control means for controlling the rotation of the optical disc; and extracting a second frequency signal from the wobble signal read by the reading means. A second extracting unit for detecting various information including address information and a set value from the second frequency signal extracted by the second extracting unit; and a wobble read by the reading unit. Third extraction means for extracting a third frequency signal from a signal; second generation means for generating a second clock signal from the third frequency signal extracted by the third extraction means; An optical disk device, comprising: a second control unit that controls recording on the optical disk by the recording unit using the second clock signal generated by the second generation unit. 10. The plurality of different frequency signals are any of CLV (constant linear velocity method), CAV (constant angular velocity method), ZCLV (combination of constant linear velocity method and constant angular velocity method), or a combination thereof. The optical disk device according to any one of claims 5 to 9, wherein the optical disk device is configured for recording / reproduction by a combination.