JP2004095091A - Method and device of generating information clock, method and device of exposing original disk of optical disk, clv multi-value recording method for device of exposing original disk of optical disk, clv multi-value recording method for optical disk drive, optical disk drive, format of optical disk media, and reproducing method of multi-value information of optical disk media and clv format - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize recording and reproduction of multi-value information of constant linear density (CLV disk format) on the information track of an optical disk in a CAV drive state in which an ideal fundamental clock string (virtual CLV<SB>CLK</SB>) for forming the CLV disk format by CAV drive on an original disk medium or optical disk media is introduced and a comparatively stable drive state is easily realized. <P>SOLUTION: A frequency in a CLV fundamental clock string for forming an information track is generated conforming to the following equation: (ω<SB>0</SB>×R<SB>0</SB>+P×ω<SB>0</SB><SP>2</SP>×n×T<SB>n</SB>/(2×π))/(LCB) wherein: n = 0, 1, 2, 3, etc., ω<SB>0</SB>; rotation angular velocity of turn table, R<SB>0</SB>; exposure start radius position, P; track pitch, T<SB>n</SB>; arbitrary time interval of frequency updating, n; the number of times of updating formatter drive clock from start of exposure, L<SB>CB</SB>; fundamental length on formed CLV information track. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical disc master exposing apparatus for producing an optical disc master having a constant linear velocity spiral information track using a light beam, recording / reproduction of information tracks by an optical disc drive apparatus, and an optical disc medium, and a CAV (Constant Angular). The present invention relates to a method and an apparatus capable of forming an optical disk master equipped with a CLV (Constant Linear Velocity; constant linear velocity) format in a Velocity (constant angular velocity) drive state, and particularly to a multivalued recording / reproducing method and apparatus using a CLV information track. .
[0002]
[Prior art]
In recent years, there has been an increasing demand for large-capacity optical disk media as high-capacity storage media for recording and accessing high-quality moving images. There are several methods for increasing the capacity, for example, a method of forming a recording / reproducing beam spot, a track pitch, a pit length, etc., using near-field light, or a method of forming a multilayer recording layer. Methods such as multi-valued information have been proposed and studied.
[0003]
For example, Patent Literature 1 proposes an optical information recording / reproducing apparatus and an optical information recording / reproducing method for recording / reproducing a CLV type optical disc by a CAV method and realizing a high access and a high transfer rate. Discloses an optical disc master disc exposure method and an exposure apparatus for disclosing a CLV format exposure method in a CAV driving state.
[0004]
Further, Patent Document 3 proposes an optical recording / reproducing method and apparatus which enables high-precision multi-level recording, and Patent Document 4 discloses a method which enables high-density overwriting with a small amount of energy, A magneto-optical recording method, a recording apparatus and a reproducing apparatus for the same, which enable accurate recording / reproducing of data of density recording, have been proposed. Optical information reproducing methods, apparatuses and optical information recording media which enable the same have been proposed.
[0005]
[Patent Document 1]
JP-A-2000-11524 (pages 4 to 5, FIG. 1)
[Patent Document 2]
JP-A-5-234152 (page 3, FIG. 1)
[Patent Document 3]
JP 2001-176071 A (page 3, FIG. 1 and FIG. 2)
[Patent Document 4]
JP-A-6-76399 (page 5, FIG. 1)
[Patent Document 5]
JP-A-8-287468 (pages 4 to 5, FIGS. 13 to 16)
[0006]
[Problems to be solved by the invention]
Conventionally, in terms of the recording density, the information track of the CLV disk format (constant linear velocity; constant linear density) is more advantageous in terms of recording density (capacity). However, it is realized on the CAV disk format because of its easy recording / reproduction.
[0007]
In information recording with a constant linear density, it is difficult to form multi-valued recording pits due to the difficulty in arranging information pits at strictly accurate positions in the CLV driving state. There are also CLV disk format forming methods by CAV drive, but in these methods, a clock for information formation is generated based on rotation information of a turntable, and the clock accuracy is sufficient to form multi-value information. is not.
[0008]
The present invention solves the conventional problem and provides an ideal basic clock train (virtual CLV) for forming a CLV disk format driven by CAV on an optical disk master or an optical disk medium._CLK) To enable recording / reproducing of multi-value information with a constant linear density (CLV disc format) on information tracks of an optical disc in a CAV driving state in which a relatively stable driving state is easily realized. The purpose is to:
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is an optical disc master exposing apparatus or an optical disc drive apparatus, in which a CLV format information track is recorded on an optical disc master or an optical disc medium which is mounted on a turntable and driven by CAV. This is a method of generating an information clock used in forming, wherein a frequency in a CLV basic clock train for generating an information track is set to:
(Ω₀× R₀+ P × ω₀ ²× nxT_n/ (2 × π)) / (L_CB)
(However, n = 0, 1, 2, 3,..., Ω₀; Turntable rotational angular velocity, R₀; Exposure start radial position, P; Track pitch, T_nArbitrary time interval for frequency update, n; Number of formatter drive clock updates from start of exposure, L_CB; Basic length on the formed CLV information track)
According to this method, a CLV basic clock train (virtual CLV) according to the relational expression is generated._CLKBy generating the information clock at the frequency of ()), CLV format exposure with a constant linear density in the CAV driving state becomes possible.
[0010]
According to a second aspect of the present invention, in the method of generating an information clock according to the first aspect, each clock generation time is corrected according to a rotation fluctuation of a turntable that is rotationally driven by CAV driving. According to this method, the virtual CLV is changed according to the rotation fluctuation of the optical disk master or the optical disk medium when the information track is formed._CLKSince the clock generation position is corrected, it is possible to perform a more precise CLV format exposure with a constant linear density in the CAV driving state.
[0011]
The third aspect of the present invention is used when forming an information track of the CLV format on an optical disk master or an optical disk medium which is mounted on an optical disk master exposure apparatus or an optical disk drive and is mounted on a turntable and driven by CAV. Device for generating an information clock, wherein a frequency in a CLV basic clock train for generating an information track is
(Ω₀× R₀+ P × ω₀ ²× nxT_n/ (2 × π)) / (L_CB)
(However, n = 0, 1, 2, 3,..., Ω₀; Turntable rotational angular velocity, R₀; Exposure start radial position, P; Track pitch, T_nArbitrary time interval for frequency update, n; Number of formatter drive clock updates from start of exposure, L_CB; Basic length on the formed CLV information track)
The apparatus is provided with a generating means for generating in accordance with the following relational expression. With this apparatus, it is possible to perform the optical disk master exposure or the optical disk recording by the CLV format exposure according to the first aspect.
[0012]
According to a fourth aspect of the present invention, in the information clock generating apparatus according to the third aspect, there is provided means for correcting each clock generation time in accordance with a rotation fluctuation of a turntable rotationally driven by CAV driving. With this apparatus, CLV format exposure with higher precision and a constant linear density can be performed in a CAV driving state.
[0013]
According to a fifth aspect of the present invention, there is provided a turntable on which an optical disc master is mounted, a rotation driving means for rotating the turntable, and a converging means for converging and irradiating a recording exposure beam based on an information recording signal mounted as an information track. And irradiating means, and traverse driving means for laterally moving the turntable on which the optical disk master is mounted in a plane parallel to the optical disk master, or laterally moving the converging means and the irradiating means in a plane parallel to the optical disk master. An optical disc master exposing method used in an optical disc master exposing apparatus that performs a CAV drive exposure under the control of the rotation driving means and the horizontal feeding driving means, the method comprising: A CLV base generated by the method for generating an information clock according to claim 1 or 2. While outputting information track signal in accordance with clock train to and forming a constant linear velocity format on the optical disc master, by this method, virtual in a stable CAV drive state CLV_CLKSince the exposure can be performed using the information track, it is possible to make the physical arrangement of the information tracks (information tracks having a constant linear density) formed as the CLV disk format formed on the optical disk master more ideal. it can.
[0014]
According to a sixth aspect of the present invention, there is provided a turntable on which an optical disc master is mounted, a rotation driving means for rotating the turntable, and a converging means for converging and irradiating a recording exposure beam based on an information recording signal mounted as an information track. And irradiating means, and traverse driving means for laterally moving the turntable on which the optical disk master is mounted in a plane parallel to the optical disk master, or laterally moving the converging means and the irradiating means in a plane parallel to the optical disk master. 2. A CLV multi-value recording method for an optical disc master exposing apparatus, comprising: a traverse drive unit, wherein a CAV drive exposure is performed under the control of the rotation drive unit and the traverse drive unit. A plurality of CLV basic clock train positions generated by the information clock generating method described in The method is characterized in that multivalued information is formed by forming information pits having a phase difference, and by this method, an optical disc master equipped with an information track containing multilevel information having a constant linear density is manufactured in an optical disc master exposure apparatus. enable.
[0015]
According to a seventh aspect of the present invention, there is provided a turntable on which an optical disc master is mounted, a rotation driving means for rotating the turntable, and a convergence for converging and irradiating a recording exposure beam based on an information recording signal mounted as an information track. Means and irradiating means, traversing drive means for laterally moving the turntable on which the optical disc master is mounted in a plane parallel to the optical disc master, or means for converging the recording exposure beam and irradiating means parallel to the optical disc master. 3. An optical disc master exposure apparatus, comprising: a transverse feed drive means for laterally moving in a plane, and forming an information track on a master optical disc by CAV under the control of said rotary drive means and said transverse feed drive means. The CLV basic clock train position generated by the described information clock generation method is used as a reference position. It is characterized by having formatter means having a multi-valued information generating circuit capable of forming multi-valued information pits having a plurality of phase differences, and by using this device, an information track including multi-valued information having a constant linear density is mounted. An optical disc master can be manufactured.
[0016]
The invention according to claim 8 is a rotation driving means for rotating an optical disk medium, a converging means and an irradiating means for converging and irradiating a recording exposure beam based on an information recording signal mounted as an information track; CLV multi-value recording method for an optical disc drive apparatus, comprising a traverse drive means for laterally moving the irradiation means in a plane parallel to the optical disc medium, and performing CAV drive recording by controlling the rotation drive means and the traverse drive means. In the CAV driving state, formation of multi-valued information by forming information pits having a plurality of phase differences with reference to the CLV basic clock train position generated by the information clock generation method according to claim 1 or 2. Characterized in that the information track having a constant linear density is written on a CLV disk format by this method. Because it is formed, it becomes possible to perform the recording of a large capacity without wasting relative optical disc media in the optical disc drive device.
[0017]
According to a ninth aspect of the present invention, there is provided a rotation driving unit for rotating an optical disk medium, a converging unit and an irradiating unit for converging and irradiating a recording exposure beam based on an information recording signal mounted as an information track; An optical disc drive device for laterally moving the irradiating means in a plane parallel to the optical disc medium and controlling the rotation driving means and the transverse feed driving means to perform CAV recording; And means for forming multi-value information by forming information pits having a plurality of phase differences with reference to the CLV basic clock train position generated by the information clock generation method according to claim 1 or 2; It is characterized by performing recording, and by this device, the linear density is fixed on the CLV disk format. Since distribution tracks are formed, it is possible to perform recording of a large capacity without wasting the optical disc medium.
[0018]
According to a tenth aspect of the present invention, there is provided a format in an optical disk medium used in the optical disk drive device according to the ninth aspect, wherein a sector formed along an information track on the optical disk medium is a binary of CLV format. It is characterized by comprising a header portion formed and a data portion formed in multi-valued CLV format. With this configuration, sector address information and the like are described in a sector configuration formed along an information track. Since the header portion data is formed as binary information of the CLV disk format (constant linear density), the sector can be specified by the same method as the CAV drive reproduction of the conventional optical disk medium equipped with the CLV disk format.
[0019]
According to an eleventh aspect of the present invention, there is provided a format in an optical disk medium used in the optical disk drive device according to the ninth aspect, wherein a sector formed along an information track on the optical disk medium is a binary of the CAV format. It is characterized by comprising a header portion formed and a data portion formed in multi-valued CLV format. With this configuration, sector address information and the like are described in a sector configuration formed along an information track. Since the header portion data is formed as binary information of the CAV disk format, the sector can be specified by the same method as the conventional CAV drive reproduction of the medium mounted with the CAV disk format.
[0020]
According to a twelfth aspect of the present invention, there is provided the optical disk medium according to the tenth or eleventh aspect, wherein the optical disk medium has a multilevel information track formed at a constant linear density by CAV driving. Since multi-valued information tracks having a constant density are mounted, a large-capacity optical disc medium without waste is realized.
[0021]
According to a thirteenth aspect of the present invention, there is provided the method of reproducing multi-valued information in the CLV format on the optical disk medium according to the tenth, the eleventh or the twelfth aspect, wherein the method is rotated and driven by CAV driving. The method is characterized in that reproduction is performed using a CLV basic clock train generated by a method of generating an information clock, and a virtual CLV is reproduced from an optical disk medium in a stable CAV driving state by this method._CLKBy reproducing multi-valued information using, multi-valued information formed on an optical disc medium and having a constant linear density can be reproduced.
[0022]
According to a fourteenth aspect of the present invention, the optical disk drive device according to the ninth aspect and the information clock generating device according to the third or fourth aspect are mounted, and further generate a drive pulse for rotating the optical disk medium and feeding the pickup. A CAV drive pulse generator, a multi-value generating circuit, a multi-value information reproducing circuit, a synchronization detecting circuit, an address detecting circuit, and a controller are provided at least to enable recording / reproducing of multi-value information. With this configuration, it is possible to record / reproduce multi-value information with a constant linear density.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
[0024]
FIG. 1 is a block diagram for explaining a configuration of an embodiment of an optical disk master exposure apparatus according to the present invention, wherein 1 is an exposure laser for exposing a glass master 5 which is an optical disk master coated with a photoresist, and 2 is an exposure laser. An optical system that is an irradiation unit that shapes the laser light emitted from the exposure laser 1 and guides the exposure laser light to a focus actuator 4 that is a converging unit. The focus actuator 4 converts the incident exposure laser light into an exposure spot. And focus control is constantly performed so that the beam waist position is kept at the photoresist position. Reference numeral 3 denotes an optical modulator, which is based on a signal Fout from a formatter 15 which is a format signal generator (including a multiplexed information generating circuit) for generating a signal for forming pre-embossed pits and grooves on the glass master 5. The exposure laser light is turned on / off. Reference numeral 16 denotes a basic clock generator for generating a basic clock for driving the formatter 15.
[0025]
The glass master 5 is attracted and rotated by a turntable T driven by a turntable rotation motor 6 which is a rotation driving means. At the same time, the focus actuator 4 is moved in the radial direction of the glass master 5 by an air slider 8 which is a lateral feed driving means. Reference numeral 7 denotes an encoder provided on the turntable rotation motor 6 and outputs a pulse train according to rotation. Reference numeral 14 denotes a linear encoder for detecting a radial position of the exposure spot on the glass master 5. Reference numerals 9 and 11 denote drivers for driving the air slider 8 and the turntable T. Reference numerals 10 and 12 denote smooth and accurate air / slider 8 and the turntable T in response to a movement / rotation command specified by the drive system controller 13. Is a control circuit for causing
[0026]
Further, 16 is a basic clock generator, 17 is a turntable rotation command pulse generation circuit, 18 is a transverse drive command pulse generation circuit, and 19 is a CLV to be described later._CLKIt is a generating device.
[0027]
SP in the figure_encIs the turntable encoder output pulse, SL_encIs a linear encoder output pulse, CLK is a formatter basic clock, F_goIs the formatter start signal, F_outIndicates a format signal output.
[0028]
In FIG. 1, a sensor for detecting an absolute position for presetting the value of the linear encoder 14 is omitted. Further, as the optical disk master exposure apparatus, it is necessary to set two-beam exposure or meandering of the exposure beam in accordance with various disk formats. However, since various exposure optical systems and the like required for them are not directly related to the present invention, Omitted.
[0029]
Further, in this example, the focus actuator 4 and the exposure optical system 2 are laterally moved in a plane parallel to the glass master 5 by the air slider 8 which is a lateral feed driving means. It is also conceivable to employ a traverse driving means for laterally moving the mounted turntable T in a plane parallel to the glass master 5.
[0030]
In the present embodiment, when the basic length LCB of information formation is assumed on the glass master 5 along an equal-pitch spiral information track, Expression (1) holds.
[0031]
(Equation 1)
r × ω × T_f= L_CB
In CAV driving, the equation (Equation 2) holds.
[0032]
(Equation 2)
r = R₀+ V_s× t
Here, r is the radial position, ω is the rotational angular velocity of the turntable T, T_fIs the basic length L of the information track_CBThe time interval required to form₀Is the start radius of the equal pitch spiral information track, V_SIs a feed speed for moving the turntable T or the exposure optical system 2 sideways, and t is an elapsed time from the start of exposure.
[0033]
In the equation (Equation 1), “r × ω” corresponds to the linear velocity. By changing the rotational angular velocity and the feed rate so that “r × ω = VL (constant)”, a CLV disk format with a constant linear velocity (constant linear density) can be formed.
[0034]
In order to form a CLV disk format having a constant linear density by CAV driving, in Expressions (1) and (2), ω = ω₀= (Constant), V_S= V_S0= (Constant), T_fBy changing the basic length L of the information track._CBCan be formed to a fixed length.
[0035]
Equations (3) and (4) are obtained from the equations (1) and (2).
[0036]
(Equation 3)
F_f= 1 / T_f= ((R₀+ V_S0× t) × ω₀) / L_CB
[0037]
(Equation 4)
V_S0= P × ω₀/ (2 × π)
Equation (Equation 5) is obtained from Equations (Equation 3) and (Equation 4).
[0038]
(Equation 5)
F_f= Ω₀× (R₀+ P × ω₀× t / (2 × π)) / L_CB
Here, t is a continuous value._nIs used, the elapsed time t from the start of the exposure is as shown in Expression (6).
[0039]
(Equation 6)
t = n × T_n(However, n = 1, 2, 3, ...)
And T_nFrequency F per time interval_fnIs updated, the relational expression shown in Expression (7) is established.
[0040]
(Equation 7)
F_fn= (Ω₀× R₀+ P × ω₀ ²× nxT_n/ (2 × π)) / L_CB
Time T_nIs set sufficiently small, it is possible to perform information track exposure in the CLV disk format having a constant linear density in the CAV driving state. As a result, as shown in the explanatory diagram of the frequency update state shown in FIG._CLKAs a result, a clock with sufficient accuracy can be generated.
[0041]
FIG. 3 is a basic configuration diagram of a pulse generator system according to the present embodiment. The pulse generator system includes a turntable rotation command pulse generation circuit 17 that receives a basic clock (CLK), a transverse drive command pulse generation circuit 18, And a turntable rotation drive command pulse (T_CLK), Traverse feed drive command pulse (S_CLK) And a formatter drive pulse train (F_CLK; Virtual CLV_CLK) At the time T_nAnd T_CLKPulse or S_CLKPulse or a pulse obtained by multiplying these pulses._CLKPulse or S_CLKThe period of the pulses or the multiplied pulses of these pulses is constant).
[0042]
The arrangement of these pulses along the time axis makes it relatively easy to make the error negligible with respect to the ideal CLV format information track formation. Actually, the fluctuation component which becomes a problem in the information track of the CLV disk format formed on the optical disk master mainly fluctuates due to a drive error of the turntable drive system and the traverse drive system.
[0043]
As described above, each drive command pulse and virtual CLV_CLKCan be generated ideally along the time axis. Also in the drive system, stable drive characteristics can be easily obtained by CAV drive, but there is a fluctuation in rotational speed when viewed minutely. By detecting this rotation fluctuation, the virtual CLV_CLKBy adding a correction to the clock generation time, it is possible to accurately form an information track with a constant linear density on the glass master 5.
[0044]
FIG. 4 shows a virtual CLV according to the present embodiment._CLKFIG. 4 is an explanatory diagram of a configuration example of a correction circuit for the rotation fluctuation of the turntable of FIG._CLKAre a plurality of virtual CLVs delayed at minute intervals by the delay circuit 21._CLKAnd output to the pulse selection circuit 22. The pulse position correction information generation circuit 23 outputs the pulse selection information to the pulse selection circuit 22, and outputs a plurality of virtual CLVs slightly delayed according to the rotation error information._CLKFrom the virtual CLV of the most ideal occurrence position along the time axis_CLKIs selected and the virtual CLV corrected for the rotation error_CLKOutput.
[0045]
FIG. 5 is a diagram showing a relationship between a rotation drive command pulse train (a) ideally arranged along the time axis and a drive feedback pulse (b) as a rotation error. The signal from the encoder 7 attached to T is used. In FIG. 5, ΔT and ΔT ′ correspond to the rotation error and become the rotation fluctuation information.
[0046]
As shown in FIG. 1, in the optical disk master exposure apparatus that performs CAV (constant angular velocity) drive exposure by controlling the turntable rotation motor 6 and the air slider 8, the above-described virtual CLV is used._CLKExposure of the information track by using the CL makes it possible to form a CLV disk format having a constant linear density.
[0047]
FIG. 6 is a virtual CLV_CLKFIG. 9 is an explanatory diagram illustrating an example of a forming pulse of multi-valued information having a constant linear density and having a discontinuous phase difference with respect to a position as a reference position._CLKΔT in the + and-directions of the time axis with reference to_MVirtual CLV_CLKIs multi-valued information by the time difference (phase difference) with respect to. Virtual CLV by exposure by CAV drive_CLKPeriod changes according to the radial position to form a phase difference. ΔT_MMay be constant or may be changed according to the information track position.
[0048]
As described above, the reproduction of information from the optical disk medium on which the multi-valued information is loaded is performed by CAV driving the optical disk medium and the virtual CLV as in the case of recording._CLKUsing this virtual CLV_CLKThis is performed by extracting phase difference information between the position and the mounting information.
[0049]
Virtual CLV_CLKFor the frequency setting, it is necessary to specify the current address position (disc radial position). However, in the case of adding multi-valued data or reading out information of an arbitrary address, additional writing or rewriting of a CD or DVD system is required. The reading can be performed by using a reading method adopted in the medium, that is, by using address information previously formed by frequency modulation due to meandering of an information track or address information by phase modulation. In addition, virtual CLV_CLKAnd the phase of the reproduced multi-valued information signal can be adjusted by detecting a synchronization pattern previously formed in the multi-valued information track.
[0050]
FIG. 7 is an explanatory diagram showing a sector configuration of an information track in the optical disk medium of the present embodiment. A header portion describing address information of the sector and the like is recorded in a binary recording CLV format.
[0051]
In this case, the access to an arbitrary sector can be performed in the same manner as the conventional CAV drive reproduction of a CLV disk format medium. After specifying the sector number, the virtual CLV_CLKTo reproduce the multi-valued information formed in the CLV format.
[0052]
FIG. 8 is an explanatory diagram showing another example of the sector configuration of the information track in the optical disk medium of the present embodiment. The header section describing the address information of the sector and the like is recorded in a binary recording CAV format.
[0053]
In this case, the access to an arbitrary sector can be performed in the same manner as the conventional CAV drive reproduction of a CAV disk format medium. After specifying the sector number, the virtual CLV_CLKTo reproduce the multi-valued information formed in the CLV format.
[0054]
The CAV drive in the optical disk master exposure apparatus shown in FIG. 1 will be described individually. The turntable rotation drive command pulse train and the traverse drive command pulse are generated by the turntable rotation command pulse generation circuit 17 and the traverse drive command pulse generation circuit 18 by the methods described above. Virtual CLV_CLKIn the generation device 19, the virtual CLV is calculated according to the above equation (Equation 7)._CLK(Formatter drive clock F_fnGenerate A virtual CLV is output by the formatter (including the multi-value information generation circuit) 15._CLKIs generated as a reference. Virtual CLV_CLKMay be updated in synchronization with the multiplied pulse signal of the turntable rotation drive command pulse.
[0055]
In addition, virtual CLV_CLKIs generated by extracting rotation error information from the turntable rotation drive control circuit 12 and generating a virtual CLV._CLKA virtual CLV that has been fed back to the generation device 19 to correct the rotation error_CLKMay be performed.
[0056]
CAV drive is performed by this optical disk master exposure apparatus, and a virtual CLV_CLKOf the formatter driving clock F according to the equation (Equation 7)._fnAnd the formatter driving clock F_fnBy generating multi-value information based on the above, a large-capacity optical disc master equipped with multi-value information having a constant linear density (CLV disc format) by CAV drive can be manufactured.
[0057]
FIG. 9 is a configuration diagram of a main part of a recording / reproduction control system in an embodiment of the optical disk drive device according to the present invention, and shows parts such as a focus system, a tracking system, a writing system, and a drive system that are not directly related to the present invention. Although not shown in the figure, the optical disk drive basically has an optical pickup similar to a known optical disk drive.
[0058]
The present optical disk drive device includes a CAV drive pulse generator 25 that generates drive pulses for rotating the optical disk medium and feeding the optical pickup, and a virtual CLV._CLKThe circuit includes a generation circuit 26, a multi-value conversion circuit 27, a multi-value information reproduction circuit 28, a synchronization detection circuit / address detection circuit 29, a controller 30, and the like.
[0059]
At the time of recording, address information is extracted by a reproduction signal from the optical pickup according to the address information as described above, and the optical pickup is moved to a target sector. The controller 30 drives the optical disk medium by CAV and generates a virtual CLV corresponding to a recording sector position._CLKIs a virtual CLV_CLKThe virtual CLV is generated by the generation circuit 26._CLKThe multi-value information is generated and recorded by the multi-value conversion circuit 27 with reference to. Virtual CLV during data recording_CLKThe frequency is constantly updated.
[0060]
At the time of reproduction, address information is extracted from a reproduction signal from the optical pickup according to the address information, and the pickup is moved to a target sector. The controller 30 drives the optical disk medium by CAV, and outputs a virtual CLV corresponding to a reproduction sector position._CLKIs a virtual CLV_CLKThe virtual CLV is generated by the generation circuit 26._CLKIs reproduced by the multi-valued information reproducing circuit 28 with the reference position as a reference position._CLKAnd the reproduction signal are synchronized). During playback, virtual CLV during data playback_CLKThe frequency is constantly updated.
[0061]
In an information recording medium such as a glass master or an optical disk medium, information is recorded or reproduced by the optical disk master exposing device or the optical disk drive device by including multi-value information having a constant linear density (CLV disk format) in an information track. It is possible to do.
[0062]
【The invention's effect】
As described above, according to the present invention, the frequency in the CLV basic clock train for generating the information track is generated according to the relational expression of the above equation (Equation 7), so that the linear density in the CAV driving state is constant. CLV format exposure is realized.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration of an optical disc master exposure apparatus according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram of a frequency update state in the present embodiment.
FIG. 3 is a basic configuration diagram of a pulse generation system according to the present embodiment.
FIG. 4 shows a virtual CLV according to the embodiment._CLKExplanatory diagram of a configuration example of a correction circuit for rotation fluctuation of a turntable of FIG.
FIG. 5 is a diagram showing a relationship between a rotation drive command pulse train ideally arranged along a time axis and a drive feedback pulse as a rotation error according to the embodiment;
FIG. 6 shows a virtual CLV according to the embodiment._CLKExplanatory diagram showing a forming pulse train of multiplexed information having a constant linear density and having a discontinuous phase difference with respect to a position
FIG. 7 is an explanatory diagram showing a sector configuration of an information track on the optical disc of the embodiment.
FIG. 8 is an explanatory diagram showing another example of a sector configuration of an information track on the optical disc of the embodiment.
FIG. 9 is a configuration diagram of a main part of a recording / reproduction control system in an embodiment of an optical disk drive device according to the present invention.
[Explanation of symbols]
2) Exposure optical system
4 Focus actuator
5 mm glass master
T turntable
6 turntable rotation motor
7 encoder
8 Air slider
10 slider control circuit
12 turntable rotation drive control circuit
13 drive system controller
14 linear encoder
15 format signal generator
16 basic clock generator
17 ° turntable rotation command pulse generation circuit
18 ° traverse drive command pulse generation circuit
19 Virtual CLV_CLKGenerator
20 ° formatter drive pulse generation circuit
21 ° delay circuit
22 pulse selection circuit
23 ° pulse position correction information generation circuit
25 CAV drive pulse generator
26 virtual CLV_CLKGeneration circuit
27 multiplexing circuit
28 ° multiplexed information reproduction circuit
29 Synchronization detection circuit / address detection circuit

Claims (14)

A method for generating an information clock used when forming an information track of a CLV format on an optical disk master or an optical disk medium placed on a turntable and driven by a CAV in an optical disk master exposure apparatus or an optical disk drive apparatus,
The frequency in the CLV basic clock train for generating the information track is
(Ω ₀ × R ₀ + P × ω ₀ ² × n × T _n / (2 × π)) / (L _CB )
(However, n = 0, 1, 2, 3,..., Ω ₀ ; rotational angular velocity of the turntable, R ₀ ; exposure start radial position, P; track pitch, T _n ; arbitrary time interval of frequency update, n ; Number of formatter drive clock updates from start of exposure, L _CB ; basic length on CLV information track to be formed)
A method for generating an information clock, wherein the information clock is generated according to the following relational expression. 2. The information clock generation method according to claim 1, wherein each clock generation time is corrected according to a rotation fluctuation of a turntable that is rotationally driven by CAV driving. An information clock generating device which is mounted on an optical disk master exposing device or an optical disk drive device and is used for forming a CLV format information track on an optical disk master or an optical disk medium which is mounted on a turntable and driven by CAV. ,
The frequency in the CLV basic clock train for generating the information track is
(Ω ₀ × R ₀ + P × ω ₀ ² × n × T _n / (2 × π)) / (L _CB )
(However, n = 0, 1, 2, 3,..., Ω ₀ ; rotational angular velocity of the turntable, R ₀ ; exposure start radial position, P; track pitch, T _n ; arbitrary time interval of frequency update, n ; Number of formatter drive clock updates from start of exposure, L _CB ; basic length on CLV information track to be formed)
An information clock generating device, comprising: generating means for generating in accordance with a relational expression. 4. The information clock generating device according to claim 3, further comprising means for correcting each clock generation time in accordance with a rotation fluctuation of a turntable rotationally driven by CAV driving. A turntable on which the optical disc master is mounted, a rotation drive means for rotating the turntable, a converging means and an irradiating means for converging and irradiating a recording exposure beam based on an information recording signal mounted as an information track; Transverse drive means for laterally moving the turntable in a plane parallel to the optical disc master, or transverse drive means for laterally moving the converging means and the irradiating means in a plane parallel to the optical disc master, An optical disc master exposing method used in an optical disc master exposing apparatus that performs CAV drive exposure under the control of a rotation drive unit and the lateral feed drive unit,
3. A constant linear velocity format is formed on the optical disk master while outputting an information track signal in accordance with the CLV basic clock sequence generated by the information clock generating method according to claim 1 or 2 so that the linear density is constant on the optical disk master. A method for exposing an optical disc master, comprising: A turntable on which the optical disc master is mounted, a rotation drive means for rotating the turntable, a converging means and an irradiating means for converging and irradiating a recording exposure beam based on an information recording signal mounted as an information track; Transverse drive means for laterally moving the turntable in a plane parallel to the optical disc master, or transverse drive means for laterally moving the converging means and the irradiating means in a plane parallel to the optical disc master, A CLV multi-value recording method for an optical disc master exposure apparatus that performs CAV drive exposure under the control of a rotation drive unit and the traverse drive unit,
In the CAV driving state, multi-level information is formed by forming information pits having a plurality of phase differences with reference to a CLV basic clock train position generated by the information clock generation method according to claim 1 or 2. CLV multi-level recording method. A turntable on which the optical disk master is mounted, a rotation driving means for rotating the turntable, a converging means and an irradiating means for converging and irradiating a recording exposure beam based on an information recording signal mounted as an information track; Lateral drive means for moving the mounted turntable laterally in a plane parallel to the optical disc master, or transverse drive for moving the converging means and the irradiating means of the recording exposure beam in a plane parallel to the optical disc master. Means for forming an information track by CAV on the optical disk master under the control of the rotation driving means and the lateral feed driving means.
A formatter means having a multi-level information generation circuit capable of forming a multi-level information pit having a plurality of phase differences with reference to the CLV basic clock train position generated by the information clock generation method according to claim 1 or 2. An optical disc master exposure apparatus, characterized in that: Rotation driving means for rotating the optical disc medium, converging means and irradiating means for converging and irradiating a recording exposure beam based on an information recording signal mounted as an information track, and converging means and the irradiating means parallel to the optical disc medium. A CLV multi-value recording method for an optical disc drive device, comprising a traverse driving means for laterally moving in a plane, and performing CAV driving recording by controlling the rotation driving means and the traverse driving means,
In the CAV driving state, multi-level information is formed by forming information pits having a plurality of phase differences with reference to a CLV basic clock train position generated by the information clock generation method according to claim 1 or 2. CLV multi-level recording method for an optical disk drive device. Rotation driving means for rotating the optical disc medium, converging means and irradiating means for converging and irradiating a recording exposure beam based on an information recording signal mounted as an information track, and converging means and the irradiating means parallel to the optical disc medium. An optical disk drive device having a traverse driving means for laterally moving in a plane, and performing CAV driving recording by controlling the rotation driving means and the traverse driving means,
Means for forming multilevel information by forming information pits having a plurality of phase differences with reference to the CLV basic clock train position generated by the information clock generation method according to claim 1 or 2 in the CAV driving state. And an optical disk drive device for performing CLV multi-level recording. 10. A format in an optical disk medium used in the optical disk drive device according to claim 9, wherein a sector formed along an information track on the optical disk medium is a header formed of binary values in a CLV format and a sector in a CLV format. A format in an optical disc medium, comprising a data part formed by multi-values. 10. A format in an optical disk medium used in the optical disk drive device according to claim 9, wherein a sector formed along an information track on the optical disk medium is composed of a header portion formed in binary of a CAV format and a sector formed in a CLV format. A format in an optical disc medium, comprising a data part formed by multi-values. 12. The optical disk medium according to claim 10, wherein the optical disk medium has a multi-valued information track formed at a constant linear density by CAV driving. 13. A method for reproducing multi-valued information in a CLV format on an optical disk medium according to claim 10, 11 or 12, wherein the information is generated by the information clock generating method according to claim 1 while being rotationally driven by CAV driving. A method of reproducing multi-valued information in a CLV format, characterized in that reproduction is performed using a CLV basic clock train. An optical disk drive device according to claim 9, an information clock generation device according to claim 3 or 4, and a CAV drive pulse generator for generating a drive pulse for rotation of the optical disk medium and feed of a pickup; An optical disc drive device comprising at least a circuit, a multi-valued information reproducing circuit, a synchronization detecting circuit, an address detecting circuit, and a controller, and capable of recording / reproducing multi-valued information.

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