JP2007213711A - Optical disk recording method and optical disk recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk recording method for stabilizing a recording quality even in an optical disk having a difference in recording characteristics between the inner and outer peripheries, and performing a recording with less read error. <P>SOLUTION: The inner and outer circumferential profile information of the optical disk is specified on the basis of the kind of the optical disk read out by irradiating the optical disk with laser beam. When recording, an occasional recording parameter is corrected on the basis of the specified inner and outer circumferential profile information of the optical disk and the current positional information of an occasional recording position on the optical disk. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical disc recording method, and more particularly to control of recording parameters when recording on an optical disc.

  In recent years, the writing speed of optical discs has been increasing year by year, and in particular for CD-R optical discs, optical discs and recording devices that are capable of recording at a speed exceeding 40 times have already become widespread.

FIG. 6 shows a conventional optical disc recording / reproducing apparatus, and FIG. 7 shows a flowchart of the main part during the recording operation.
The optical disk recording / reproducing apparatus shown in FIG. 6 includes an optical head means 2 for optically accessing a recordable optical disk 1, an RF signal generating means 3 for generating a reproduction signal from a read signal of the optical head means 2, and an optical disk 1. Via an access means 4 for driving the optical head means 2 moving in the radial direction, a laser drive means 5 for outputting a recording laser beam in synchronization with an output of an encoder means 7 to be described later at the time of recording, and an RF signal generating means 3 The recorded information demodulating means 6 for detecting the recorded information on the disc from the reproduced signal read out in this manner, and the recording pulse to generate the recording pulse by modulating the data to be recorded into the recording pulse data for recording on the disc 1, and the laser drive Encoder means 7 for driving means 5, control means 8 for operating said access means 4, laser drive means 5, encoder means 7, and information And a storage unit 9.

The information storage means 9 describes a single parameter of sensitivity for each optical disc type for each vendor supplying the optical disc 1.
FIG. 7 is a flowchart of the control means 8 when writing from the address A1 to A2 of the optical disc 1 is executed.

First, in step S0-1 of FIG. 7, the control means 8 instructs the access means 4 to move the optical head means 2 to the recording start address A1.
In step S0-2, the control means 8 corresponds to the optical disk 1 in use on the basis of the reproduction signal read out and demodulated from the optical disk 1 through the optical head means 2, the RF signal generation means 3, and the recorded information detection means 6. The sensitivity parameters thus read out are read from the information storage means 9, and the recording light power and the recording light pulse width are determined based on the recording linear velocity.

In step S0-3, the control unit 8 operates the laser driving unit 5 to start writing so that the recording light power and the recording light pulse width determined in step S0-2 are obtained.
In step S0-4, the current position information or linear velocity information accessed by the optical head means 2 is acquired.

In step S0-5, the recording light power and the recording light pulse width are determined based on the recording linear velocity determined from the information acquired in step S0-4.
In step S0-6, the control unit 8 operates the laser driving unit 5 to start writing so that the recording light power and the recording light pulse width determined in step S0-5 are obtained.

  In step S2-7, the control means 8 determines whether "recording up to address A2 has been completed", and if "recording up to address A2 has not been completed" is detected, from step S0-4 The routine of step S0-6 is repeatedly executed until it is detected in step S2-7 that "recording to address A2 has been completed".

  In this way, the control means 8 performs writing with the same parameters over the entire surface from the inner periphery to the outer periphery of the optical disc 1 based on the single parameter of sensitivity corresponding to the optical disc 1 being used.

  For recording at speeds exceeding 40x speed, the CALV (Constant Angular Velocity Constant Angular Velocity) method or the Zone CLV method where the speed is switched in a partial part (Zone) even if the CLV (Constant Linear Velocity constant linear velocity) is used. As described above, a recording method in which the recording speed differs between the inner periphery and the outer periphery of the optical disc 1 is often employed. In this recording method, the linear velocity at the time of recording differs between the inner circumference and the outer circumference by about 2.5 times. To cope with this, the characteristics of the recording film (sensitivity from the inner circumference to the outer circumference) ) Are different.

  In general, recording at the highest speed is more difficult because the timing conditions are stricter than recording at the lower speed, which is disadvantageous in terms of recording quality and to ensure higher recording quality. It is advantageous to record all areas of the optical disc at a relatively low speed.

In addition, in an optical disk recording / reproducing apparatus that uses a slim type motor as a motor for rotating the optical disk 1, there is a recording apparatus that has a limitation on high-speed recording due to torque limitation.
However, when the entire surface is recorded at a relatively low speed, for example, 8 times speed CLV, on the high-speed compatible optical disc having different sensitivities on the inner and outer circumferences as described above, when recording is performed using the same parameters on the entire surface. Even if it is optimal on the inner periphery, a phenomenon occurs in which the recording quality gradually decreases from the inner periphery toward the outer periphery.

As a conventional method for solving this problem, the reflected light from the optical disk 1 is monitored and recording is performed while changing the recording power according to the reflected light amount (RunningOPC), CAV recording, or divided into a plurality of zones. A method of performing ZoneCAV or ZoneCLV recording using an appropriate parameter for each zone is known.
JP 2001-243627 A

  As described above, there are many optical discs 1 on the market that have greatly different characteristics between the inner periphery and the outer periphery. When recording is started on the optical disk in an optimum state on the inner periphery and the entire surface is recorded using the same recording parameters, an error in data read from the optical disk is obtained as shown in FIG. The value of the state BLER (Block Error Rate) increases as it goes to the outer periphery, and the recording quality deteriorates as it goes to the outer periphery. In a severe case, there arises a problem that data on the outer periphery cannot be read. FIG. 8B is a BLER graph in the case where no malfunction occurs.

  As one method for solving such a problem, there is known a method (Running OPC) in which reflected light from a disk is monitored and recording is performed while changing recording power in accordance with the amount of reflected light. In this case, since the reflected light is monitored, the circuit configuration becomes complicated and the cost of the apparatus increases.

  In addition, when CAV recording, Zone CAV, or Zone CLV recording is performed on an optical disc, recording is performed at a relatively high speed on the outer peripheral side of the optical disc, which is disadvantageous in securing high recording quality. When the optical disc is divided into a plurality of zones and ZoneCLV recording is performed using appropriate parameters for each zone, the difference in recording quality between the innermost and outermost circumferences of the optical disc is somewhat improved. It does not correspond to the inner / outer circumference characteristic difference of, and the recording quality difference between the inner and outer circumferences still remains in each zone, so the recording quality deteriorates near the zone boundary, and if it is severe, reading error There is a problem that is likely to occur.

  The present invention relates to an optical disk recording method capable of stabilizing recording quality and preventing recording from causing unreadable errors, without complicating the apparatus configuration, even for an optical disk having a difference in recording characteristics between the inner and outer circumferences. An object of the present invention is to provide an optical disk recording / reproducing apparatus.

  In the optical disk recording method according to the first aspect of the present invention, when recording is performed by irradiating the optical disk with a laser, information in which the optical disk inner / outer profile information representing the recording characteristics is written from the inner periphery to the outer periphery for each type of the optical disk. The storage means reads out the optical disk based on the type of the optical disk read by irradiating the optical disk to identify the corresponding outer peripheral profile information in the optical disk. At the time of recording, the specified outer peripheral profile information in the optical disk It is characterized in that recording is performed by correcting the recording parameters from time to time based on the current position information of the recording location.

  The optical disk recording method according to claim 2 of the present invention is the optical disk recording method according to claim 1, wherein at least one of the laser power and the pulse width at the time of output to the optical disk is converted into the current position information on the optical disk and the outer peripheral profile information on the optical disk. The correction is based on the above.

  According to a third aspect of the present invention, there is provided an optical disk recording method according to the first aspect, wherein at least one of laser power and pulse width at the time of output to the optical disk is converted into current position information on the optical disk and outer peripheral profile information on the optical disk. On the basis of this, the correction is performed in a curved shape, a staircase shape, or a linear shape from the inner periphery to the outer periphery.

  According to a fourth aspect of the present invention, there is provided an optical disk recording apparatus comprising: reading means for detecting the type of an optical disk set and current position information on the optical disk being recorded; and recording characteristics from the inner circumference to the outer circumference for each type of optical disk. Information storage means in which information on the outer periphery of the optical disk representing the information is written, and information on the outer periphery of the optical disk read from the information storage means based on the type of the optical disk detected by the reading means, and the reading means at the time of recording The recording parameter at the time of recording on the optical disk is corrected on the basis of the current position information on the optical disk detected by the above.

  The optical disk recording apparatus according to claim 5 of the present invention is the optical disk recording apparatus according to claim 4, wherein at least one of the laser power and the pulse width at the time of output to the optical disk is converted into the current position information on the optical disk and the outer peripheral profile information on the optical disk. It is characterized in that the correction is made based on the above.

  The optical disk recording apparatus according to claim 6 of the present invention is the optical disk recording apparatus according to claim 4, wherein the information storage means determines a curved, stepped or linear correction characteristic extending from the inner periphery of the optical disk to the outer periphery for each type of optical disk. A coefficient or a target value necessary for this is written as outer peripheral profile information in the optical disc.

  According to this configuration, it is possible to perform recording using an appropriate recording parameter even on an optical disc having a difference in inner and outer circumference characteristics that has been increasing in recent years, particularly without adding a circuit and complicated processing. Therefore, stable recording quality can be obtained, and an unreproducible error can hardly occur.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
1 to 5 show (Embodiment 1) of the present invention.

  FIG. 1 shows an optical disk recording / reproducing apparatus, and the content of data written in the information storage means 9 is different from the conventional example shown in FIG. Furthermore, the configuration of the control means 8 is also different. The rest is the same as the conventional example shown in FIG.

  An optical disc 1 that is recorded / reproduced by this optical disc recording / reproducing apparatus is a recordable optical disc such as a CD-R optical disc, a CD-RW optical disc, a DVD-R optical disc, or a DVD-RW optical disc.

  When recording data on the optical disc 1, a laser beam tracing the optical disc 1 is irradiated from the optical head means 2 as reading means from the laser driving means 5, thereby reading (reproducing) the recorded data on the disc 1 and recording. Sometimes, the optical head unit 2 irradiates the laser by driving the laser driving unit 5 to record data. The RF signal generating means 3, the access means 4, the recorded information detecting means 6, and the data to be recorded under the control of the control means 8 are modulated into recording pulse data for recording on the disk 1 (generated as recording pulses), The encoder means 7 for driving the laser driving means 5 is the same as that shown in FIG.

  The information storage means 9 stores the optical disc inner periphery profile information 10 of the disc 1. Specifically, a value predetermined by an experiment or the like for each optical disc type is stored in the information storage means 9.

Hereinafter, an example of a method for determining the optical disc inner periphery profile information 10 will be described.
In the first embodiment, the recording power is changed as a recording parameter in order to compensate for the difference between the inner and outer peripheral characteristics of the optical disc 1. The power that provides the best recording quality in the vicinity of specific addresses on the inner circumference, middle circumference, and outer circumference of the optical disc 1 is obtained in advance by experiments. With the horizontal axis as the address on the disk and the vertical axis as the power, an approximate curve that passes through the three obtained points is obtained. In this embodiment, as shown in FIG. 3, as a polynomial representing an approximate curve,
P (x) = ax ² + bx + c... The coefficients a, b, and c are stored in the information storage means 9 as the optical disc outer peripheral profile information 10 in each optical disc 1 to be used, using the first equation. . When the optimum recording power at the address x of the optical disc is obtained based on the outer peripheral profile information 10 in the optical disc, the equation 1 is used. The above is an explanation of an example of a method for determining the optical disc inner-periphery profile information 10 through experiments.

The control means 8 for recording over the addresses A1 to A2 of the optical disk 1 using the data written in the information storage means 9 is configured as shown in FIG.
In executing the flow of FIG. 2, the reading of the type of the optical disc is completed. Specifically, the type of the optical disc is specified by reading recorded information on the disc. For example, in the case of a CD-R, the ATIP Special information recorded on the innermost circumference A0 in FIG. 1 can be read, and the optical disc vendor can be specified by the value.

  When recording from address A1 to address A2 at CLV 8 × speed on the optical disk 1 of the type CD-R after specifying the optical disk vendor, the control means 8 drives the access means 4 in step S1 to perform recording. The optical head means 2 is moved to the start address.

  In step S2, the coefficients a, b, and c corresponding to the optical disc vendor information are acquired as the optical disc inner peripheral profile information 10 corresponding to the set optical disc from the optical disc inner peripheral profile information 10.

  In step S3, the recording power at the address A1 is determined and set on the basis of the outer peripheral profile information 10 in the optical disk acquired from the information storage means 9, and recording is executed in step S4. In this embodiment, recording at the optimum recording power at the address A1 determined based on the coefficients a, b, c obtained at step S2 and the address X = A1 and the first equation is performed at step S4. Yes.

In step S5, the position information recorded in advance on the disk 1 is demodulated by the recorded information demodulating means 6 and read out as current position information during the recording operation.
In step S6, the current position information read in step S5 is substituted into the first equation, and the optical disc inner periphery profile information 10 of the optical disc 1 at the current position is acquired.

In step S7, the recording power at the current position is determined and set based on the information in step S6, and the recording operation is performed.
In step S8, it is determined whether "recording up to address A2 has been completed". Until it is detected in step S8 that "recording up to address A2 has been completed", the process returns to step S4, and in step S5, recording is performed with the optimum recording power determined in the immediately preceding step S7. The routine of S8 is repeated. As described above, when it is detected in step S8 that "recording up to the recording end position address A2 has been completed", the recording operation is terminated.

  In this embodiment, the coefficient is written so that the recording parameter can be controlled in a curved shape based on the first expression. However, as the optical disc inner peripheral profile information 10, the recording parameter at an arbitrary position on the disc is determined. It is sufficient that the information can be obtained. Based on the value obtained by experiment, the section from the inner periphery to the outer periphery is divided as shown in FIG. 4A, and the optimum recording power for each section is written as the target value. Even if it is controlled in a staircase shape, it can be similarly implemented. Further, as shown in FIG. 4B, the same can be implemented by writing coefficients so that the recording parameters can be controlled linearly based on the following second formula.

P (x) = dx + e (2) In each of the above embodiments, the recording power of the mark portion is set as a recording parameter depending on the position on the optical disk during recording in order to compensate for the difference between the inner and outer circumferences of the optical disk. However, instead of the recording power, the recording pulse width of the mark portion may be changed as shown in FIG. 5A or FIG. 5B by using a similar method. Furthermore, the parameter to be changed may be only one of the recording power and the recording pulse width, or may be applied to both parameters.

  Further, the above has been described by taking CLV 8 × recording as an example, but it can also be applied to CAV recording. In CAV recording, since the linear velocity usually increases as it goes to the outer periphery, it is a conventional method to change the recording power in a direction in which the recording power is increased, but by adding the outer peripheral profile information in the optical disk of the disc to the change. The recording quality can be further stabilized.

  In order to cope with changes in the temperature environment and the like, the optimum power is obtained using the generally known OPC method before executing the recording flowchart of FIG. 2, and a value proportional to the obtained value is obtained as described above. By multiplying the control power, it is possible to cope with environmental differences such as temperature.

  In each of the above embodiments, the recording parameters are recorded by correcting the recording parameters by executing steps S3 to S8 for all types of optical discs. It is only necessary to apply to an optical disc that is known to be relatively large. Specifically, before executing the recording flowchart of FIG. 2, after confirming the optical disc vendor, which is the type of optical disc, whether or not it is an optical disc having an inclined recording characteristic at the inner and outer periphery is written in the information recording means 9. It is not necessary to apply this method to an optical disc that is discriminated with reference to the table and whose recording characteristics have an inclination within an allowable range on the inner and outer circumferences.

  As described above, the optical disk inner / outer profile information 10 is provided in the recording apparatus even for a recording optical disk having a difference in inner / outer periphery characteristics without adding a circuit or complicated processing. By performing recording while referring to the inner / outer profile information 10 and appropriately changing the recording parameters according to the recording position, it is possible to stabilize the recording quality over the entire surface of the disk and realize recording that is less likely to cause unreadable errors. .

  Each of the above embodiments is a case of CLV (constant linear velocity) or Zone CLV, but can also be applied to a case of CAV (constant angular velocity).

  The optical disc recording / reproducing apparatus and the optical disc recording method according to the present invention can record using the optimum recording parameters in accordance with the characteristics of the optical disc, can obtain a stable recording quality, and generate an unreproducible error. It is possible to realize recording that is difficult to perform, and is useful as a data recording technique for various optical disks.

1 is a configuration diagram of an optical disc recording / reproducing apparatus according to Embodiment 1 of the present invention. The flowchart figure of the control means of the same embodiment Explanatory drawing of the outer peripheral profile information in the optical disc of the embodiment Explanatory drawing of the outer periphery profile information in the optical disc of another embodiment Explanatory drawing of the pulse width setting parameter of still another embodiment Configuration diagram of a conventional optical disc recording / reproducing apparatus FIG. 6 is a flowchart for explaining a recording operation by a conventional optical disc recording / reproducing apparatus. BLER measurement diagram for cases where failure occurs due to differences in inner and outer peripheral characteristics and BLER measurement diagram for cases where failure has not occurred

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical disk 2 Optical head means 3 RF signal production | generation means 4 Access means 5 Laser drive means 6 Recorded information demodulation means 7 Encoder means 8 Control means 9 Information storage means 10 Optical disk outer periphery profile information

Claims (6)

When recording an optical disc by irradiating a laser,
Information storage means in which optical disc inner / outer profile information representing recording characteristics from the inner circumference to the outer circumference for each type of optical disc is written is read based on the type of optical disc read by irradiating the optical disc with a laser, and the corresponding optical disc Identify inner and outer profile information,
An optical disk recording method for correcting a recording parameter from time to time based on the specified outer peripheral profile information on the optical disk and current position information of a recording position on the optical disk during recording. 2. The optical disc recording method according to claim 1, wherein at least one of laser power and pulse width at the time of output to the optical disc is corrected based on current position information on the optical disc and outer peripheral profile information in the optical disc. Based on the current position information on the optical disc and the outer peripheral profile information on the optical disc, at least one of the laser power and pulse width at the time of output to the optical disc is curved, stepped, or linear from the inner circumference to the outer circumference. The optical disk recording method according to claim 1, wherein the optical disk recording method is corrected. Reading means for detecting the type of the set optical disk and the current position information on the optical disk being recorded;
An optical disk inner / outer profile information representing recording characteristics from the inner circumference to the outer circumference for each type of optical disc;
Based on the optical disc outer periphery profile information read from the information storage means based on the type of the optical disc detected by the reading means and the current position information on the optical disc detected by the reading means during recording, An optical disk recording apparatus configured to correct a recording parameter at the time of recording. 5. The optical disk recording apparatus according to claim 4, wherein at least one of laser power and pulse width at the time of output to the optical disk is corrected based on current position information on the optical disk and outer peripheral profile information in the optical disk. The information storage means writes, as optical disc inner peripheral profile information, a coefficient or a target value necessary for determining a curved, stepped or linear correction characteristic extending from the inner periphery of the optical disc to the outer peripheral direction for each type of optical disc. The optical disk recording apparatus according to claim 4, wherein the optical disk recording apparatus is configured.

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