JP2009087419A - Recording device and method, and computer program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To more suitably calculate an optimum power by taking into consideration the leakage of a push-pull signal into a focus error signal. <P>SOLUTION: This recording device is provided with: a first control means (27) for controlling a recording means so as to record data for calibration while adjusting power to plurality of ways; a first detecting means (28-2) for detecting the recording quality of the data for calibration; a detecting means (28-1) for detecting recording leakage amplitude obtained by reading the data for calibration; a first calculating means (27) for calculating power that makes recording quality desired quality as first optimum power; a second calculating means (27) for calculating the power that makes recorded leakage amplitude satisfy a first condition and the recording quality satisfy a second condition as a second optimum power when the recorded leakage amplitude corresponding to the optimum power does not satisfy the first condition; and a second control means (24) for controlling the recording means so as to start to record the data by emitting a laser beam of the first optimum power or the second optimum power. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a recording apparatus and method for recording recording data on a recording medium, for example, and a technical field of a computer program that causes a computer to function as such a recording apparatus.

  For example, in a recording apparatus that records recording data on a recording medium such as an optical disk, the recording power related to the laser light is obtained by OPC (Optimum Power Control) processing according to the type of optical disk, the type of recording apparatus, the recording speed, and the like. Optimal power is set. That is, recording power calibration is performed. Thereby, it is possible to realize an appropriate recording operation corresponding to variations in characteristics of the information recording surface of the optical disc. For example, when an optical disc is loaded in the apparatus main body and a write command is input, the light intensity related to the recording laser light is sequentially switched and data for trial writing is recorded in the OPC area (Power Calibration Area). Then, a so-called trial writing process is executed. Thereafter, the trial writing data (OPC pattern) recorded in this manner is reproduced, and the reproduction result is determined according to a predetermined evaluation criterion, and the optimum power is set.

  Also, the optimum power related to the recording laser beam can be set by OPC (so-called running OPC) performed simultaneously with the actual recording operation.

Japanese Patent No. 3159454

  In recent years, development of recording media using a dye film as a recording layer (for example, Blu-ray Disc) has been underway. In this recording medium, it is known that the reflectance of the recording layer increases by recording the recording data (that is, by irradiating with laser light). Further, it has been found by experiments and the like by the inventors of the present application that the amplitude of the push-pull signal obtained at the time of reproduction greatly varies depending on the power when recording the recording data. For this reason, due to the fact that the amplitude of the push-pull signal largely fluctuates, the leakage to the focus error signal may fluctuate (for example, the leakage may increase). For this reason, there is a technical problem that even the focus control may become unstable. Furthermore, as the worst pattern, due to recording the recording data, the amplitude of the push-pull signal becomes too large (that is, due to excessive leakage), An overcurrent flows through the focus actuator for performing the focus control, and as a result, there is a technical problem that the actuator may be burned or damaged.

  Further, the amplitude of the push-pull signal obtained in the recording area where the recording data is recorded may be greatly different from the amplitude of the push-pull signal obtained in the recording area where the recording data is not recorded. In this case, when the servo gain in the tracking control using the push-pull signal is set in accordance with the amplitude of the push-pull signal obtained in the recording area where the recording data is recorded, in the recording area where the recording data is not recorded. Tracking control can become unstable. Similarly, when the servo gain in the tracking control using the push-pull signal is set in accordance with the amplitude of the push-pull signal obtained in the recording area where the recording data is not recorded, in the recording area where the recording data is recorded. Tracking control can become unstable. In other words, particularly during playback, the amplitude of the push-pull signal obtained in the recording area where the recording data is recorded and the amplitude of the push-pull signal obtained in the recording area where the recording data is not recorded are significantly different. Therefore, there is a technical problem that tracking control may become unstable.

  The present invention has been made in view of, for example, the above-described conventional problems, and is more suitably optimized in consideration of, for example, fluctuation of a push-pull signal (particularly, leakage of a push-pull signal into a focus error signal). It is an object to provide a recording apparatus and method capable of calculating power, and a computer program.

  In order to solve the above problems, a recording apparatus according to the present invention irradiates a recording medium with a laser beam whose power can be adjusted, thereby recording recording data on the recording medium, and recording the recording data. Before starting, a first control for controlling the recording means to record calibration data for calibrating the power of the laser beam as the recording data on the recording medium while adjusting the power in a plurality of ways. Means, a first detection means for detecting a predetermined recording quality of the calibration data, and a recorded leakage amplitude indicating a leakage amount of the push-pull signal to a focus error signal obtained by reading the calibration data The second detection means for detecting the power and the power at which the predetermined recording quality detected by the first detection means becomes a desired quality is calculated as the first optimum power of the laser beam. And when the recorded leakage amplitude corresponding to the first optimum power does not satisfy the first condition, the recorded leakage amplitude satisfies the first condition and the predetermined A second calculating means for calculating a power satisfying a second condition of recording quality as a second optimum power of the laser beam; and (i) the recorded leakage amplitude corresponding to the first optimum power is the first optimum power. If the above condition is satisfied, the recording means is controlled to start recording the recording data by irradiating the laser beam with the first optimum power, and (ii) the first optimum power When the recorded leakage amplitude corresponding to the above does not satisfy the first condition, the recording means is configured to start recording the recording data by irradiating the laser beam with the second optimum power. Control And a second controller.

In order to solve the above-mentioned problems, a recording method of the present invention is a recording method in a recording apparatus comprising recording means for recording recording data on the recording medium by irradiating the recording medium with laser light whose power can be adjusted. There,
Before starting recording of the recording data, the recording means adjusts the power in a plurality of ways and records calibration data for calibrating the power of the laser light as the recording data on the recording medium. A first control step for controlling the first calibration step, a first detection step for detecting a predetermined recording quality of the calibration data, and a leak amount of the push-pull signal into the focus error signal obtained by reading the calibration data. A second detection step for detecting a recorded leaking amplitude, and a power at which the predetermined recording quality detected in the first detection step becomes a desired quality as a first optimum power of the laser beam. 1 calculation step, and when the recorded leakage amplitude corresponding to the first optimum power does not satisfy the first condition, the recorded leakage amplitude satisfies the first condition. And (i) the recorded leakage corresponding to the first optimum power, wherein a second calculation step of calculating a power satisfying a second condition of the predetermined recording quality as a second optimum power of the laser beam; If the recording amplitude satisfies the first condition, the recording means is controlled to start recording the recording data by irradiating the laser beam with the first optimum power, and (ii) ) When the recorded leakage amplitude corresponding to the first optimum power does not satisfy the first condition, the recording of the recording data is started by irradiating the laser beam with the second optimum power. And a second control step for controlling the recording means.

  In order to solve the above problems, a computer program according to the present invention irradiates a recording medium with a laser beam capable of adjusting power, recording means for recording recording data on the recording medium, and recording the recording data. Before starting, a first control for controlling the recording means to record calibration data for calibrating the power of the laser beam as the recording data on the recording medium while adjusting the power in a plurality of ways. Means, a first detection means for detecting a predetermined recording quality of the calibration data, and a recorded leakage amplitude indicating a leakage amount of the push-pull signal to a focus error signal obtained by reading the calibration data A second detection means for detecting the power, and a power at which the predetermined recording quality detected by the first detection means becomes a desired quality. And when the recorded leakage amplitude corresponding to the first optimum power does not satisfy the first condition, the recorded leakage amplitude satisfies the first condition and A second calculating means for calculating a power satisfying a second condition of the predetermined recording quality as a second optimum power of the laser beam; and (i) the recorded leakage amplitude corresponding to the first optimum power is If the first condition is satisfied, the recording means is controlled to start recording the recording data by irradiating the laser beam with the first optimum power, and (ii) the first When the recorded leakage amplitude corresponding to one optimum power does not satisfy the first condition, the recording of the recording data is started by irradiating the laser beam with the second optimum power. The record A computer program for recording control for controlling a computer provided in a recording apparatus comprising second control means for controlling a stage, the computer comprising the recording means, the first control means, and the first detection means , Functioning as at least part of the second detection means, the first calculation means, the second calculation means, and the second control means.

  The operation and other advantages of the present invention will become apparent from the embodiments described below.

  Hereinafter, as the best mode for carrying out the invention, description will be given of embodiments of the recording apparatus and method and the computer program of the present invention.

(Embodiment of recording apparatus)
The embodiment of the recording apparatus of the present invention includes a recording unit that records recording data on the recording medium by irradiating the recording medium with a laser beam capable of adjusting power, and before recording of the recording data is started. A first control unit for controlling the recording unit to record calibration data for calibrating the power of the laser beam as the recording data on the recording medium while adjusting the power in a plurality of ways; First detection means for detecting a predetermined recording quality of the calibration data, and a recorded leakage amplitude indicating a leakage amount of the push-pull signal to the focus error signal obtained by reading the calibration data. And a first calculation for calculating a power at which the predetermined recording quality detected by the first detection means becomes a desired quality as a first optimum power of the laser beam. And when the recorded leakage amplitude corresponding to the first optimum power does not satisfy the first condition, the recorded leakage amplitude satisfies the first condition and the predetermined recording quality is And (i) the recorded leakage amplitude corresponding to the first optimum power satisfies the first condition. The second calculating means calculates the power satisfying the condition of 2 as the second optimum power of the laser beam. The recording means is controlled to start recording the recording data by irradiating the laser beam with the first optimum power, and (ii) the first optimum power corresponding to the first optimum power. When the recorded leakage amplitude does not satisfy the first condition, the recording means is controlled to start recording the recording data by irradiating the laser beam with the second optimum power. 2 Control means Equipped with a.

  According to the embodiment of the recording apparatus of the present invention, the optimum power of the laser beam is calculated before recording data such as video data, audio data, and PC data. In other words, OPC (Optimum Power Control) is performed in which calibration data is recorded and an optimum power is calculated based on the read result of the recorded calibration data.

  Particularly in the present embodiment, when calculating the optimum power, first, the power at which the recording quality (for example, modulation degree, jitter, asymmetry, etc.) obtained by reading the calibration data has a desired quality is the first power. Calculated as optimal power. Thereafter, the recorded leakage amplitude corresponding to the first optimum power (that is, the leakage amplitude of the push-pull signal to the focus error signal obtained by reading the calibration data recorded at the first optimum power) is the first. It is determined whether or not the above condition is satisfied.

  When the recorded leakage amplitude corresponding to the first optimum power satisfies the first condition, the recording of recording data is started by irradiating the laser beam with the first optimum power.

  On the other hand, when the recorded leakage amplitude corresponding to the first optimum power does not satisfy the first condition, the leakage amplitude corresponding to the first optimum power is replaced with the first optimum power instead of the first optimum power. The power that satisfies the condition and the recording quality such as the modulation degree and asymmetry satisfies the second condition is calculated as the second optimum power. Thereafter, the recording of the recording data is started by irradiating the laser beam with the second optimum power.

  Here, “recording quality becomes desired quality” means, for example, a state in which the recording quality is an optimum quality on the standard of the recording medium, or a state in which the target quality is determined in advance on the standard of the recording medium Is intended to indicate. On the other hand, “the recording quality satisfies the second condition” means that the recording quality has not deteriorated to such an extent that the recorded recording data cannot be suitably read (in other words, the recorded recording data For example, a state in which a recording quality of a level at which the recording medium can be suitably read is realized), for example, a state in which a good value is allowed in the standard of the recording medium. In other words, the state where “recording quality satisfies the second condition” includes the state where “recording quality becomes desired quality”.

  Further, “the recorded leakage amplitude satisfies the first condition” is intended to indicate that the recorded leakage amplitude is in a state that does not hinder a stable recording operation or reproducing operation.

  As described above, according to the present embodiment, the optimum power (that is, the first optimum power and the second optimum power) is considered in consideration of not only the recording quality such as the modulation degree, jitter, and asymmetry but also the recorded leakage amplitude. In the following, “optimum power” is used to mean the optimum power in a broad sense including the first optimum power and the second power). Therefore, even when the amplitude of the push-pull signal varies greatly, the optimum power is calculated in consideration of leakage of the varying push-pull signal into the focus error signal. For this reason, by recording the recording data using the laser beam having the optimum power calculated in this way, the leakage amount of the push-pull signal to the focus error signal can be stably performed in the recording operation and the reproducing operation. It can be suppressed to the extent that it can. In other words, the amount of the push-pull signal leaking into the focus error signal can be reduced to such an extent that the recording operation and the reproducing operation can be performed stably. Thereby, even when the amplitude of the push-pull signal fluctuates greatly, it is possible to record the recording data with the optimum power that enables stable focus control. Therefore, the above-described problems do not occur even during reproduction, and breakage or burn-in of the actuator that performs focus control can be suitably prevented.

  In addition, by calculating the optimum power in consideration of leakage of the fluctuating push-pull signal into the focus error signal, indirectly calculating the optimum power in consideration of the amplitude of the fluctuating push-pull signal. Can do. For this reason, the amplitude of the push-pull signal (hereinafter referred to as “recorded push-pull signal” as appropriate) obtained in the recording area where the calibration data is recorded, and the push obtained in the recording area where no recording data is recorded. A state in which the amplitude of a pull signal (that is, a push-pull signal obtained in a recording area in which calibration data and recording data are not recorded and is referred to as an “unrecorded push-pull signal”) is greatly different. Can be suppressed accordingly or suitably. As a result, even when the amplitude of the push-pull signal fluctuates greatly, it is possible to record the recording data with the optimum power that enables stable tracking control. Therefore, the above-described problem does not occur even during reproduction.

  Note that in the recording medium using the above-described dye film as a recording layer, the asymmetry used as an index in the conventional OPC hardly or hardly varies with the change in power. Etc. Thus, when there is little or almost no fluctuation of asymmetry, it is difficult or impossible to calculate the optimum power with the conventional OPC. However, according to the present embodiment, the optimum power is calculated in consideration of the amplitude of the recorded push-pull signal and the amplitude of the unrecorded push-pull signal. For this reason, even if the recording medium uses the above-described dye film as a recording layer, OPC can be performed suitably, and as a result, the optimum power can be calculated suitably.

  For a recording medium in which asymmetry used as an index in conventional OPC does not change much or hardly with respect to power changes, the recording quality detected by the first detecting means is other than asymmetry. Preferably the recording quality is detected.

  Further, the present embodiment is not limited to a recording medium using a dye film as a recording layer, as long as the amplitude of the push-pull signal varies somewhat depending on the power when recording data. Needless to say, the recording apparatus can calculate the optimum power.

  In the present embodiment, it is preferable to calculate a power at which the fluctuation of the recorded leakage amplitude does not hinder a stable recording operation and a reproducing operation as the optimum power. In this sense, the condition that “leakage amplitude satisfies the first condition” in this embodiment can be appropriately set according to the characteristics and type of the recording medium, the characteristics and type of the recording apparatus, and the like. preferable.

  In one aspect of the embodiment of the recording apparatus of the present invention, the second calculation means has a recording area in which the recording data is unrecorded, the amplitude of the recorded push-pull signal corresponding to the first optimum power. The power with which the ratio to the amplitude of the unrecorded push-pull signal obtained in step 1 satisfies the first condition is calculated as the second optimum power of the laser beam.

  According to this aspect, the second optimum power is calculated based on the ratio between the recorded leakage amplitude corresponding to the first optimum power and the unrecorded leakage amplitude. For this reason, as described above, by recording the recording data using the laser beam having the second optimum power, the leakage amount of the push-pull signal to the focus error signal is suppressed to such an extent that there is almost no adverse effect on the recording operation. be able to. In other words, the occurrence of a state in which the amplitude of the recorded push-pull signal and the amplitude of the unrecorded push-pull signal are greatly different can be appropriately or suitably suppressed. As a result, the focus error signal The amount of the push-pull signal leaking into the recording medium can be suppressed to such an extent that the stable recording operation and reproducing operation are not hindered.

  In the present embodiment, the power that is suppressed to such an extent that the amount of push-pull signal leakage into the focus error signal does not hinder stable recording and reproduction operations can be calculated as the optimum power. preferable. In this sense, the “condition according to the first condition to be satisfied by the ratio” in the present embodiment may be appropriately set according to the characteristics and type of the recording medium and the characteristics and type of the recording apparatus. preferable.

  As described above, in the aspect of the recording apparatus that calculates, as the second optimum power, the power in which the ratio between the recorded leakage amplitude and the unrecorded leakage amplitude satisfies the first condition, the ratio is the first The power satisfying the above condition may be configured such that the ratio is within ± 6 dB.

  With this configuration, even if the recorded leakage amplitude and the unrecorded leakage amplitude are different (in other words, the amplitude of the recorded push-pull signal is different from the amplitude of the unrecorded push-pull signal). If the recording data is recorded with the second optimum power such that the ratio is within ± 6 dB, focus control (and tracking control) can be stably performed.

  As described above, in the aspect of the recording apparatus in which the ratio between the recorded leakage amplitude and the unrecorded leakage amplitude satisfies the predetermined condition as the optimum power, the ratio satisfies the condition according to the first condition. The satisfying power may be configured such that the ratio is within ± 3 dB.

  With this configuration, the above-mentioned condition that the “ratio is within ± 6 dB” is set to “the ratio is within ± 3 dB” in the sense that there is a margin for the stability of the focus control (and further tracking control). It has been changed to a more severe condition. Therefore, even if the recorded leakage amplitude and the unrecorded leakage amplitude are different (in other words, even if the amplitude of the recorded push-pull signal is different from the amplitude of the unrecorded push-pull signal), If recording data is recorded with the second optimum power such that the ratio is within ± 3 dB, focus control (and tracking control) can be performed more stably.

  As described above, in the aspect of the recording apparatus in which the ratio between the recorded leakage amplitude and the unrecorded leakage amplitude satisfies the predetermined condition as the optimum power, the ratio satisfies the condition according to the first condition. The satisfying power may be configured such that the recorded leakage amplitude and the unrecorded leakage amplitude are substantially the same.

  With this configuration, a state in which the recorded leakage amplitude and the unrecorded leakage amplitude are greatly different (in other words, the amplitude of the recorded push-pull signal and the amplitude of the unrecorded push-pull signal) Can be reliably suppressed from occurring. That is, even when recording data is recorded, the push-pull signal hardly fluctuates, and as a result, the leakage amplitude does not become too large. For this reason, recording data can be recorded with the second optimum power that enables stable focus control (and further tracking control).

  In another aspect of the embodiment of the recording apparatus of the present invention, the second calculation means performs the recording with respect to the amplitude of an S-shaped signal indicating a capture range obtained when focus control is performed using the focus error signal. The optimum power of the laser beam is calculated as the power at which the ratio of the finished leak amplitude satisfies the condition according to the first condition.

  According to this aspect, as described above, the amount of the push-pull signal leaking into the focus error signal can be suppressed to such an extent that there is almost no adverse effect on the recording operation. In other words, the occurrence of a state in which the amplitude of the recorded push-pull signal and the amplitude of the unrecorded push-pull signal are greatly different can be appropriately or suitably suppressed. As a result, the focus error signal The amount of the push-pull signal leaking into the recording medium can be suppressed to such an extent that the stable recording operation and reproducing operation are not hindered.

  In the present embodiment, the power that is suppressed to such an extent that the amount of push-pull signal leakage into the focus error signal does not hinder stable recording and reproduction operations can be calculated as the optimum power. preferable. In this sense, the “condition according to the first condition that the ratio should satisfy” in the present embodiment may be appropriately set according to the characteristics and type of the recording medium, the characteristics and type of the recording apparatus, and the like. preferable.

  As described above, in the aspect of the recording apparatus in which the ratio of the recorded leakage amplitude to the amplitude of the S-shaped signal satisfies the first condition as the second optimum power, the ratio is calculated as the first optimal power. The power satisfying the condition may be configured such that the recorded leakage amplitude with respect to the amplitude of the S-shaped signal is within 20%.

  With this configuration, if the recorded data is recorded with the second optimum power such that the recorded leakage amplitude is within 20% of the amplitude of the S-shaped signal, focus control (and tracking control) is stable. Can be done automatically.

  As described above, in the aspect of the recording apparatus in which the ratio of the recorded leakage amplitude to the amplitude of the S-shaped signal satisfies the first condition as the second optimum power, the ratio is calculated as the first optimal power. The power satisfying the condition may be configured such that the recorded leakage amplitude with respect to the amplitude of the S-shaped signal is within 10%.

  If configured in this way, the above-mentioned condition “the ratio is within 20%” is set to “the ratio is within 10%” in the sense that there is a margin for the stability of the focus control (and further the tracking control). It has been changed to a more severe condition. For this reason, focus control (and tracking control) can be performed more stably.

  In another aspect of the embodiment of the recording apparatus of the present invention, the detecting means detects the recorded leakage amplitude at the time of track jump.

  According to this aspect, it is possible to suitably detect the amount of the push-pull signal leaked into the focus error signal by performing the track jump.

  In another aspect of the embodiment of the recording apparatus of the present invention, the recording medium includes a spiral or concentric track, and the first control unit performs the calibration on one track with one power. After the recording data is recorded, the recording means is controlled so as to record the calibration data in another track different from the one track with another power different from the one power.

  According to this aspect, calibration data is recorded with the same power for each track. Therefore, even if the recording sensitivity or the like fluctuates within the circumference of one track, the recorded leakage amplitude of the calibration data can be suitably detected without being affected by the fluctuation. Thereby, the optimum power can be suitably calculated.

  In another aspect of the embodiment of the recording apparatus of the present invention, the recording medium includes a spiral or concentric track, and the first control unit performs the calibration on one track with one power. After the data for recording is recorded, the other track existing at a position where a predetermined space (for example, several tracks of free space) is interposed between the one track and the other power different from the one power. The recording means is controlled to record calibration data.

  According to this aspect, it is possible to preferably detect the recorded leakage amplitude of the calibration data without being affected by the track adjacent to the track on which the calibration data is recorded. Thereby, the optimum power can be suitably calculated.

  In another aspect of the recording apparatus of the present invention, when the recording quality of the recording data recorded by irradiating the laser beam with the first optimum power or the second optimum power does not become the desired quality. And adjusting means for adjusting the strategy of the laser beam so that the recording quality becomes the desired quality.

  According to this aspect, by recording the recording data using the adjusted strategy, not only the leakage amplitude but also other recording characteristics (for example, modulation degree, jitter, asymmetry, etc.) have a desired quality. As described above, recording data can be recorded.

(Embodiment of recording method)
An embodiment according to the recording method of the present invention is a recording method in a recording apparatus including a recording unit that records recording data on the recording medium by irradiating the recording medium with laser light whose power can be adjusted. Before starting to record recording data, the recording means adjusts the power in a plurality of ways and records calibration data for calibrating the power of the laser light as the recording data on the recording medium. A first control step for controlling, a first detection step for detecting a predetermined recording quality of the calibration data, and a leak amount of the push-pull signal to the focus error signal obtained by reading the calibration data A second detection step for detecting a recorded leakage amplitude, and a power at which the predetermined recording quality detected in the first detection step becomes a desired quality. A first calculation step of calculating as the first optimum power of light, and when the recorded leakage amplitude corresponding to the first optimum power does not satisfy the first condition, the recorded leakage amplitude is the first A second calculation step of calculating, as the second optimum power of the laser beam, a power that satisfies the above condition and the predetermined recording quality satisfies the second condition; (i) the recording corresponding to the first optimum power When the leaked amplitude satisfies the first condition, the recording means is controlled to start recording the recording data by irradiating the laser beam with the first optimum power, and (ii) When the recorded leakage amplitude corresponding to the first optimum power does not satisfy the first condition, the recording data is recorded by irradiating the laser beam with the second optimum power. Start And a second control step for controlling the recording means.

  According to the embodiment of the recording method of the present invention, it is possible to receive the same effects as the various effects that can be enjoyed by the above-described embodiment of the recording apparatus of the present invention.

  Incidentally, in response to the various aspects of the embodiment of the recording apparatus of the present invention described above, the embodiment of the recording method of the present invention can also adopt various aspects.

(Embodiment of computer program)
According to an embodiment of the computer program of the present invention, a recording unit that records recording data on the recording medium by irradiating the recording medium with a laser beam capable of adjusting power, and before recording of the recording data is started. A first control unit for controlling the recording unit to record calibration data for calibrating the power of the laser beam as the recording data on the recording medium while adjusting the power in a plurality of ways; First detection means for detecting a predetermined recording quality of the calibration data, and a recorded leakage amplitude indicating a leakage amount of the push-pull signal to the focus error signal obtained by reading the calibration data. 2 and a power at which the predetermined recording quality detected by the first detection means becomes a desired quality as the first optimum power of the laser beam. And when the recorded leakage amplitude corresponding to the first optimum power does not satisfy the first condition, the recorded leakage amplitude satisfies the first condition and the predetermined And (i) the recorded leakage amplitude corresponding to the first optimum power is the first optimum power for calculating the power satisfying the second condition of the recording quality as the second optimum power of the laser beam. If the condition 1 is satisfied, the recording means is controlled to start recording the recording data by irradiating the laser beam with the first optimum power, and (ii) the first optimum power When the recorded leakage amplitude corresponding to power does not satisfy the first condition, the recording is started so as to start recording of the recording data by irradiating the laser beam with the second optimum power. Control means A recording control computer program for controlling a computer provided in a recording apparatus (that is, the embodiment (including various aspects thereof) according to the recording apparatus of the present invention described above) provided with a second control means. The computer functions as at least part of the recording means, the first control means, the first detection means, the second detection means, the first calculation means, the second calculation means, and the second control means. Let

  According to the embodiment of the computer program of the present invention, if the computer program is read from a recording medium such as a ROM, a CD-ROM, a DVD-ROM, and a hard disk that stores the computer program and executed by the computer, or If the computer program is downloaded to a computer via communication means and then executed, the above-described embodiment of the recording apparatus of the present invention can be realized relatively easily.

  Incidentally, in response to the various aspects of the embodiment of the recording apparatus of the present invention described above, the embodiment of the computer program of the present invention can also adopt various aspects.

(Embodiment of computer program product)
According to an embodiment of the computer program product of the present invention, a recording unit that records recording data on the recording medium by irradiating the recording medium with a laser beam whose power can be adjusted, and before the recording of the recording data starts In addition, a first control unit that controls the recording unit to record calibration data for calibrating the power of the laser beam as the recording data on the recording medium while adjusting the power in a plurality of ways. First detection means for detecting a predetermined recording quality of the calibration data, and a recorded leakage amplitude indicating a leakage amount of a push-pull signal to a focus error signal obtained by reading the calibration data. The second detection means and the power at which the predetermined recording quality detected by the first detection means becomes a desired quality is defined as the first optimum power of the laser beam. And when the recorded leakage amplitude corresponding to the first optimum power does not satisfy the first condition, the recorded leakage amplitude satisfies the first condition and A second calculating means for calculating a power satisfying a second condition of a predetermined recording quality as a second optimum power of the laser beam; and (i) the recorded leakage amplitude corresponding to the first optimum power is If the first condition is satisfied, the recording means is controlled to start recording the recording data by irradiating the laser beam with the first optimum power, and (ii) the first When the recorded leakage amplitude corresponding to the optimum power does not satisfy the first condition, the recording data is started to be recorded by irradiating the laser beam with the second optimum power. Control recording means A program command executable by a computer provided in a recording apparatus comprising the second control means (that is, the embodiment (including various aspects thereof) according to the recording apparatus of the present invention described above). The computer functions as at least part of the recording means, the first control means, the first detection means, the second detection means, the first calculation means, the second calculation means, and the second control means. Let

  According to the embodiment of the computer program product of the present invention, if the computer program product is read into a computer from a recording medium such as a ROM, a CD-ROM, a DVD-ROM, and a hard disk storing the computer program product, or For example, if the computer program product, which is a transmission wave, is downloaded to a computer via communication means, the above-described embodiment of the recording apparatus of the present invention can be implemented relatively easily. More specifically, the computer program product may be configured by computer-readable code (or computer-readable instruction) that functions as an embodiment of the information recording apparatus of the present invention described above.

  Incidentally, in response to the various aspects of the embodiment of the recording apparatus of the present invention described above, the embodiment of the computer program product of the present invention can also adopt various aspects.

  Such an operation and other advantages of the present embodiment will be further clarified from examples described below.

  As described above, according to the embodiment of the recording apparatus of the present invention, the recording means, the first control means, the first detection means, the second detection means, the first calculation means, and the second calculation. Means and second control means. According to the embodiment of the recording method of the present invention, the first control step, the first detection step, the second detection step, the first calculation step, the second calculation step, and the second control step are provided. . According to the embodiment of the computer program of the present invention, the computer is caused to function as the embodiment of the recording apparatus of the present invention. Accordingly, the optimum power can be calculated more preferably in consideration of fluctuations in the push-pull signal (particularly, leakage of the push-pull signal into the focus error signal).

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

(1-1) Basic Configuration First, the basic configuration of the recording apparatus according to the present embodiment will be described with reference to FIG. FIG. 1 is a block diagram conceptually showing the basic structure of the recording apparatus in the example.

  As shown in FIG. 1, the recording apparatus 1 includes a disk drive 2 on which an optical disk 100 is actually loaded and data is recorded and reproduced, and a personal computer that controls data recording on the disk drive 2 and the like. And a host computer 3.

  The disk drive 2 includes an optical disk 100, a spindle motor 21, an optical pickup (PU: Pick Up) 22, an LDD (Laser Diode Driver) 23, a CPU 24, a memory 25, a data input / output control unit 26, and an OPC (Optimum Power Control) unit 27. , A leakage amplitude detection unit 28-1, a modulation degree detection unit 28-2, and a recording compensation unit 29. The host computer 3 includes an operation / display control unit 31, operation buttons 32, a display panel 33, a CPU 34, a memory 35, and a data input / output control unit 36.

  The spindle motor 21 rotates and stops the optical disc 100 and operates when accessing the optical disc 100. More specifically, the spindle motor 21 is configured to rotate and stop the optical disc 100 at a predetermined speed while receiving spindle servo from a servo unit or the like (not shown).

  The optical pickup 22 includes an LD (Laser Diode) 221 that constitutes a specific example of the “recording unit” in the present invention together with the LDD 23 in order to perform recording on the optical disc 100. More specifically, at the time of data recording, the LD 221 included in the optical pickup 22 irradiates the optical disc 100 with a laser beam LB as recording light under the control of the LDD 23. As a result, data is recorded on the optical disc 100.

  The optical pickup 22 further includes a PD (Photo Detector) 222 for reading data recorded on the optical disc 100. More specifically, when reading data, the LD 221 provided in the optical pickup 22 irradiates the optical disc 100 with a laser beam LB as reading light under the control of the LDD 23. Reflected light of the irradiated laser beam LB enters the PD 222. Thereby, the data recorded on the optical disc 100 is read.

  The LDD 23 drives the LD 221 included in the optical pickup 22 so that an optimum recording laser power can be determined by an OPC pattern recording and reading process described later during an OPC process described later. Thereafter, the LDD 23 is configured to drive the LD 221 included in the optical pickup 22 with the optimum recording laser power determined by the OPC process when recording data. At the time of recording this data, the optimum recording laser power is modulated according to the data to be recorded.

  The CPU 24 is connected to various components included in the disk drive 2 via a data bus, and controls the entire disk drive 2 by giving instructions to the various components. Usually, software or firmware for operating the CPU 24 is stored in the memory 25.

  The memory 25 is used in general data processing and OPC processing in the disk drive 2. The memory 25 includes a ROM area that stores a program (that is, firmware) that causes the disk drive 2 to operate, a RAM area that temporarily stores data, and the like.

  The data input / output control unit 26 controls data input / output from the outside to the disk drive 2. A drive control command issued from an external host computer 3 connected to the disk drive 2 via an interface such as SCSI or ATAPI is transmitted to the CPU 24 via the data input / output control unit 26. Similarly, recorded data is exchanged with the host computer 3 via the data input / output control unit 26.

  The OPC unit 27 controls the OPC process. Specifically, the LDD 23 is controlled so as to record the OPC pattern. Further, the OPC unit 27 receives the reading result of the recorded OPC pattern from the PD 222, the leakage amplitude of the push-pull signal to the focus error signal detected by the leakage amplitude detection unit 28-1, and the recorded OPC pattern. An optimum recording laser power is calculated based on each of the modulation degrees detected by the modulation degree detection unit 28-2 that receives the reading result from the PD 222.

  The leakage amplitude detection unit 28-1 is configured to be able to detect the leakage amplitude of the push-pull signal to the focus error (FE) signal. Specifically, the leak amplitude of the push-pull signal to the focus error signal can be detected based on the reading result in the PD 222.

  The modulation degree detection unit 28-2 is configured to be able to detect the modulation degree. Specifically, the modulation degree can be detected based on the reading result in the PD 222.

  The recording compensation unit 29 is configured so that the LDD 23 can adjust the recording strategy for driving the LD 221.

  The operation / display control unit 31 receives and displays an operation instruction for the host computer 3 and transmits an instruction by the operation button 32 such as “record” to the CPU 34.

  Based on the instruction information from the operation / display control unit 31, the CPU 34 transmits a control command (command) to the disk drive 2 via the data input / output control unit 36 to control the entire disk drive 2. Similarly, the CPU 34 can transmit a command requesting the disk drive 2 to transmit the operation state to the host. Thus, since the operation state of the disk drive 2 such as “recording” can be grasped, the CPU 34 outputs the operation state of the disk drive 2 to the display panel 33 such as a fluorescent tube or an LCD via the operation / display control unit 31. can do.

  The memory 35 is an internal storage device used by the host computer 3, for example, a ROM area in which a firmware program such as BIOS (Basic Input / Output System) is stored, an operating system, variables necessary for the operation of an application program, etc. Is constituted by a RAM area or the like in which is stored.

(1-2) Optical Disc Next, with reference to FIG. 2, the basic configuration of the optical disc 100 that is the target of the recording operation of the recording apparatus 1 according to the present embodiment will be described. FIG. 2 is a schematic plan view showing the basic structure of the optical disc 100, and is a schematic conceptual diagram of the recording area structure in the radial direction of the optical disc 100. As shown in FIG.

  As shown in FIG. 2, the optical disc 100 has, for example, an inner peripheral PCA (Power Calibration Area) 111, an RMA (Recording) on the recording surface on the disc main body having a diameter of about 12 cm, with the center hole 101 as the center. Management Area) 112, a lead-in area 113, a data recording area 114, a lead-out area 115, and an outer peripheral PCA 116 are provided. For example, a groove track and a land track are alternately provided in a spiral shape or a concentric shape around the center hole 101. On this track, the data pattern is divided and recorded in units of ECC blocks. The ECC block is a data management unit capable of error correction. In this embodiment, the optical disc 100 may be a write-once recording medium that can record a data pattern only once, or a rewritable recording medium that can record a data pattern multiple times. There may be.

  The groove track is oscillated with a constant amplitude and spatial frequency. That is, the groove track is wobbled, and the wobble cycle is set to a predetermined value. On the land track, pits called land pre-pits (LPP) indicating preformat addresses are formed. With these two addressing (namely, wobble and land pre-pit), it is possible to control disk rotation during recording and to generate a recording clock and to obtain information necessary for data pattern recording such as a recording address. The preformat address may be recorded in advance by modulating the wobble of the groove track by a predetermined modulation method such as frequency modulation or phase modulation.

(1-3) Operation Example Next, with reference to FIG. 3, an operation example of the recording apparatus 1 according to the present embodiment will be described. FIG. 3 is a flowchart conceptually showing a flow of the operation example of the recording apparatus 1 in the example.

  As shown in FIG. 3, before starting the recording of data in the data recording area 114, the OPC process is performed under the control of the OPC unit 27 under the control of the CPU 24. Specifically, first, under the control of the OPC unit 27 that constitutes a specific example of the “first control means” in the present invention, the recording laser power is changed in a stepwise manner with respect to the inner peripheral PCA 111. The OPC pattern is recorded (step S101). As an OPC pattern, for example, a recording pattern in which a short mark corresponding to a 3T pulse and a long mark corresponding to an 11T pulse are alternately formed together with a space of the same length can be given as an example.

  Thereafter, under the control of the OPC unit 27, the OPC pattern recorded on the inner peripheral PCA 111 is read by the PD 222 (step S102). Such reading of the OPC pattern is repeated by the number of times of change of the recording laser power in one OPC process. The reading result by the PD 222 (that is, the reading result of the OPC pattern) is output to each of the leakage amplitude detection circuit 28-1 and the modulation degree detection circuit 28-2.

  Subsequently, by the operation of the modulation degree detection circuit 28-2 constituting a specific example of the “first detection means” in the present invention, the modulation degree (that is, in the recording area where the OPC pattern is recorded) is determined from the read result of the OPC pattern. The degree of modulation is detected (step S103). Similarly, the focus error signal (that is, the OPC pattern) obtained from the read result of the OPC pattern is recorded by the operation of the leakage amplitude detection circuit 28-1 constituting one specific example of the “second detection means” in the present invention. The leakage amplitude of the push-pull signal to the focus error signal in the recorded area is detected (step S103). In the following description, the leakage amplitude of the push-pull signal to the focus error signal in the recording area where the OPC pattern is recorded is appropriately referred to as “recorded leakage amplitude”. Each of the detected modulation degree and leakage amplitude is output to the OPC unit 27. Thereby, the OPC unit 27 can recognize the correlation between the recording laser power and the modulation degree and the correlation between the recording laser power and the leakage amplitude.

  In step S103, it is preferable that the leak amplitude of the push-pull signal to the focus error signal in the recording area where no data such as an OPC pattern is recorded is also detected. In the following description, the leakage amplitude of the push-pull signal to the focus error signal in a recording area where data such as an OPC pattern is not recorded is appropriately referred to as “unrecorded leakage amplitude”.

  Here, a specific configuration example of the leakage amplitude detection circuit 28-1 will be described with reference to FIG. FIG. 4 is a block diagram conceptually showing a configuration example of the leakage amplitude detection circuit 28-1.

  As shown in FIG. 4, the leakage amplitude detection circuit 28-1 includes a recording / non-recording determination unit 281, a peak hold circuit 282, a bottom hold circuit 283, and an adder 284.

  A read result (particularly, an RF signal) of the PD 222 is input to the recording / non-recording determination unit 281. Based on the RF signal, the recording / unrecording determination unit 281 determines whether the recording area currently being read is a recording area where data such as an OPC pattern is recorded (in other words, data such as an OPC pattern). Whether or not the recording area is not recorded. The determination result is output to each of the peak hold circuit 282 and the bottom hold circuit 283.

  The reading result (particularly, the focus error signal) of the PD 222 is input to each of the peak hold circuit 282 and the bottom hold circuit 283. The peak hold circuit 282 and the bottom hold circuit 283 detect the peak value and the bottom value of the focus error signal, respectively. At this time, using the determination result in the recording / unrecording determination unit 281, the peak value and the bottom value of the focus error signal and the data such as the OPC pattern are recorded in the recording area where the data such as the OPC pattern is recorded. Detection is performed while distinguishing the peak value and the bottom value of the focus error signal in the recording area that is not. Thereafter, the adder 284 subtracts the bottom value of the focus error signal detected by the bottom hold circuit 283 from the peak value of the focus error signal detected by the peak hold circuit 282. As a result, the leakage amplitude of the push-pull signal into the focus error signal is obtained. The obtained leakage amplitude is output to the OPC unit 27.

  Here, the detection of the leakage amplitude using the leakage amplitude detection circuit 28-1 is preferably performed when a track jump is performed. Here, when the leakage amplitude is obtained by subtracting the bottom value of the focus error signal detected by the bottom hold circuit 283 from the peak value of the focus error signal detected by the peak hold circuit 282, a track jump is performed. The recording laser power when the data such as the OPC pattern recorded in the previous recording area is recorded is the same as the recording laser power when the data such as the OPC pattern recorded in the recording area after the track jump is recorded. Preferably there is. Alternatively, both the recording area before the track jump and the recording area after the track jump are preferably recording areas in which data such as an OPC pattern is not recorded.

  On the other hand, instead of detecting each of the peak value and the bottom value of the focus error signal, either the peak value or the bottom value of the focus error signal is detected, and any of the detected peak value or bottom value is detected. One of them may be handled as the amplitude of the focus error signal. In this case, the recording laser power when the data such as the OPC pattern recorded in the recording area before the track jump is recorded and the recording laser when the data such as the OPC pattern recorded in the recording area after the track jump is recorded. Power does not have to be the same.

  In FIG. 3 again, the optimum recording laser power is calculated by the operation of the OPC unit 27 constituting one specific example of the “first calculation unit” and the “second calculation unit” in the present invention.

  More specifically, first, a recording laser power that optimizes the modulation degree detected in step S103 is calculated. Thereafter, the leakage amplitude corresponding to the recording laser power at which the modulation degree is optimum (in other words, the focus error signal obtained by reading the OPC pattern recorded at the recording laser power at which the modulation degree is optimum). It is determined whether or not the push-pull signal leakage amplitude) satisfies a predetermined condition (step S104). Here, for example, the ratio of the leakage amplitude corresponding to the recording laser power at which the degree of modulation is optimal with respect to the leakage amplitude in a recording area where data such as an OPC pattern is not recorded satisfies a predetermined condition. It is determined whether or not there is.

  In this embodiment, as the “predetermined condition”, the ratio of the leakage amplitude corresponding to the recording laser power at which the degree of modulation is optimal with respect to the leakage amplitude in a recording area where data such as an OPC pattern is not recorded. May fall within ± 6 dB ”(see“ No. 1 ”in FIG. 5 described later).

  Preferably, as the “predetermined condition”, the ratio of the leakage amplitude corresponding to the recording laser power at which the degree of modulation is optimal with respect to the leakage amplitude in a recording area where data such as an OPC pattern is not recorded is ± The condition of “contain within 3 dB” may be used (see “No. 2” in FIG. 5 described later).

  More preferably, as the “predetermined condition”, the ratio of the leakage amplitude corresponding to the recording laser power at which the degree of modulation is optimal with respect to the leakage amplitude in a recording area where data such as an OPC pattern is not recorded. 1 (that is, the leakage amplitude in a recording area where data such as an OPC pattern is not recorded is substantially the same as the leakage amplitude corresponding to the recording laser power at which the modulation degree is optimal). (See “No. 3” in FIG. 5 described later).

  As a result of the determination in step S104, when it is determined that the leakage amplitude corresponding to the recording laser power that optimizes the modulation degree satisfies a predetermined condition (step S104: Yes), the modulation degree is optimal. Is calculated as the optimum recording laser power (step S105).

  On the other hand, as a result of the determination in step S104, when it is determined that the leakage amplitude corresponding to the recording laser power that optimizes the modulation degree does not satisfy the predetermined condition (step S104: No), the modulation degree The recording laser power corresponding to the recording laser power that optimizes the recording laser power satisfies the predetermined condition and the modulation degree falls within the allowable range permitted by the standard of the optical disc 100 is calculated as the optimal recording laser power. (Step S106). In particular, the leakage amplitude corresponding to the recording laser power at which the modulation degree is optimum satisfies the predetermined condition, and the modulation degree is an optimum value within the allowable range permitted by the standard of the optical disc 100. The recording laser power is preferably calculated as the optimum recording laser power.

  Here, with reference to FIG. 5, the optimum recording laser power calculated by the recording apparatus according to the present embodiment will be described in more detail. FIG. 5 is a graph showing the optimum recording laser power on a graph showing the correlation between the leakage amplitude and modulation degree and the recording laser power in the recording area where the OPC pattern is recorded.

  As shown in FIGS. 5A and 5B, the correlation between the recording laser power and the modulation degree and the recording laser power and the leakage are determined based on the modulation degree and the leakage amplitude detected in step S103 in FIG. Correlation with amplitude is obtained. Similarly, the leakage amplitude in a recording area where data such as an OPC pattern is not recorded is also obtained.

  Here, as the “predetermined condition”, “the ratio of the leakage amplitude corresponding to the recording laser power at which the degree of modulation is optimal with respect to the leakage amplitude in a recording area where data such as an OPC pattern is not recorded is ± It is assumed that the condition “contains within 3 dB” is used.

  In the example shown in FIG. 5A, the leakage amplitude corresponding to the recording laser power at which the modulation degree is optimal is “the modulation degree with respect to the leakage amplitude in a recording area where data such as an OPC pattern is not recorded. The condition that the ratio of the leakage amplitude corresponding to the optimum recording laser power is within ± 3 dB is satisfied. Therefore, in the example shown in FIG. 5A, the recording laser power that optimizes the degree of modulation is calculated as the optimum recording laser power.

  On the other hand, in the example shown in FIG. 5B, the leakage amplitude corresponding to the recording laser power at which the modulation degree is optimal is “the leakage amplitude in the recording area where data such as an OPC pattern is not recorded. The condition that the ratio of leakage amplitude corresponding to the recording laser power at which the degree of modulation is optimal is within ± 3 dB is not satisfied. For this reason, in the example shown in FIG. 5B, “leakage amplitude corresponding to the recording laser power at which the degree of modulation is optimal with respect to the leakage amplitude in the recording area where data such as an OPC pattern is not recorded. Among the recording laser powers satisfying the condition that “the ratio of the values falls within ± 3 dB”, the recording laser power with the optimum modulation degree (for example, the maximum) is calculated as the optimum recording laser power.

  In the above description, the optimum recording laser power is calculated based on the ratio of the leakage amplitude. However, in one optical disc 100, the leakage amplitude in a recording area where data such as an OPC pattern is not recorded generally does not change. In consideration of this, the optimum recording laser power may be calculated based on the leakage amplitude itself in the recording area where the OPC pattern is recorded, instead of the leakage amplitude ratio.

  In FIG. 3 again, after that, it is determined whether or not the recording compensation operation for adjusting the recording strategy is executed under the control of the recording compensation unit 29 that constitutes a specific example of the “adjustment unit” in the present invention. (Step S107). Here, if data is once recorded with the optimum recording laser power calculated in step S105 or step S106, and the recording quality of the recorded data (for example, modulation degree, jitter, asymmetry, etc.) is good. It is determined that the recording compensation is not executed. On the other hand, if the recording quality of the data recorded with the optimum recording laser power is not good, it is determined that the recording compensation is executed.

  As a result of the determination in step S107, if it is determined that the recording compensation operation is to be executed (step S107: Yes), the operation of the recording compensation unit 29 that constitutes a specific example of the “adjustment unit” in the present invention, A recording compensation operation is performed (step S108). Specifically, the recording strategy (particularly, elements other than the peak power) is adjusted so that the recording quality of the data recorded with the optimum recording laser power is good. Refer to Japanese Patent No. 2592086 for details of the recording compensation operation.

  Thereafter, recording of data in the data recording area 114 is started under the control of the CPU 24 constituting one specific example of the “second control means” in the present invention (step S109). In other words, when the leakage amplitude corresponding to the recording laser power at which the modulation degree is optimal satisfies a predetermined condition, the laser beam LB having the optimal recording laser power calculated in step S105 is used in step S108. Data recording is started by irradiating while modulating in accordance with the recording strategy adjusted in. On the other hand, if the leakage amplitude corresponding to the recording laser power at which the modulation degree is optimum does not satisfy the predetermined condition, the laser beam LB having the optimum recording laser power calculated in step S106 is obtained in step S108. Data recording is started by irradiating while modulating in accordance with the recording strategy adjusted in.

  On the other hand, as a result of the determination in step S107, when it is determined that the recording compensation operation is not executed (step S107: No), the data recording area 114 is not executed under the control of the CPU 24 without executing the recording compensation operation. Recording of data is started (step S109). That is, when the leakage amplitude corresponding to the recording laser power at which the modulation degree is optimal satisfies a predetermined condition, the laser beam LB having the optimal recording laser power calculated in step S105 is changed to the default value. Data recording is started by irradiating while modulating in accordance with the recording strategy. On the other hand, if the leakage amplitude corresponding to the recording laser power at which the modulation degree is optimum does not satisfy the predetermined condition, the laser beam LB having the optimum recording laser power calculated in step S106 is changed to the default value. Data recording is started by irradiating while modulating in accordance with the recording strategy.

  Here, in the optical disc 100 (for example, Blu-ray Disc) using a dye film as a recording layer, the amplitude of the push-pull signal obtained during reproduction greatly varies depending on the recording laser power. It has been proved by experiments. For this reason, as shown in the upper part of FIG. 6A, the amplitude of the push-pull signal in the recording area where the data is recorded is greatly different from the amplitude of the push-pull signal in the recording area where the data is not recorded. It can be. Here, an example is shown in which the amplitude of the push-pull signal in the recording area where data is recorded is larger than the amplitude of the push-pull signal in the recording area where data is not recorded. Furthermore, the amount of leakage of the push-pull signal into the focus error signal may increase due to the amplitude of the push-pull signal becoming too large by recording the recording data. In this case, as shown in the lower part of FIG. 6A, the push-pull signal may greatly fluctuate. This is not preferable because there is an increased risk of overcurrent flowing through the focus actuator for performing focus control. This is not preferable because it causes burn-in or breakage of the focus actuator.

  However, in this embodiment, unlike the conventional OPC, not only the recording quality such as the modulation degree, jitter, and asymmetry, but also the leakage amplitude of the push-pull signal to the focus error signal in the recording area where the data is recorded. And the optimum recording laser power so that the difference between the leakage amplitude of the push-pull signal to the focus error signal in the recording area where no data is recorded becomes small (or the difference disappears). Is calculated as For this reason, as shown in the lower part of FIG. 6B, in this embodiment, there is a difference between the leakage amplitude in the recording area where data is recorded and the leakage amplitude in the recording area where data is not recorded. It becomes smaller (or disappears). As a result, even when the amplitude of the push-pull signal varies greatly depending on the recording laser power, the inconvenience of the leakage of the push-pull signal into the focus error signal (for example, the leakage increases). Can be suitably suppressed. Therefore, even when the amplitude of the push-pull signal varies greatly depending on the recording laser power, data can be recorded with a recording laser power that enables stable focus control.

  Furthermore, the difference between the leakage amplitude in the recording area where data is recorded and the leakage amplitude in the recording area where data is not recorded is substantially reduced (or eliminated) in FIG. As shown in the upper part of b), in this embodiment, the difference between the amplitude of the push-pull signal in the recording area where data is recorded and the amplitude of the push-pull signal in the recording area where data is not recorded is small. (Or disappear). Thus, when the servo gain in tracking control is set according to the amplitude of the push-pull signal obtained in the recording area where data is not recorded, and the amplitude of the push-pull signal obtained in the recording area where data is recorded. In either case of setting together, it is possible to suitably suppress the tracking control from becoming unstable. Therefore, even when the amplitude of the push-pull signal varies greatly depending on the recording laser power, data can be recorded with a recording laser power that enables stable tracking control.

  In addition, in the optical disc 100 using the above-described dye film as a recording layer, the inventor of the present application has little or almost no variation in asymmetry used as an index in the conventional OPC with respect to a change in recording laser power. It has been proved by experiments. Thus, when there is little or almost no variation in asymmetry, it is difficult or impossible to calculate the optimum recording laser power with the conventional OPC. However, according to the present embodiment, the optimum recording laser power is calculated in consideration of the leakage amplitude in the recording area where data is recorded and the leakage amplitude in the recording area where data is not recorded. For this reason, even with the optical disc 100 using the above-described dye film as a recording layer, OPC can be suitably performed, and as a result, an optimal recording laser power can be suitably calculated.

  In the above-described embodiment, the configuration for calculating the optimum recording laser power based on the modulation degree and the leakage amplitude has been described. However, instead of the modulation degree, the optimum recording laser power may be calculated based on other recording quality such as jitter and asymmetry and leakage amplitude. However, for the optical disc 100 with little or little variation in asymmetry used as an index in the conventional OPC with respect to the change in recording laser power, it is based on the recording quality other than asymmetry and the amplitude of the push-pull signal. It is preferable to calculate the optimum recording laser power.

  The present embodiment is not limited to the optical disc 100 using the dye film as the recording layer, and any embodiment can be used as long as the amplitude of the push-pull signal varies somewhat depending on the recording laser power when recording data. It goes without saying that an optimum recording laser power can be calculated by the recording apparatus 1 according to the above.

  In the above description, an example of the operation for calculating the optimum recording laser power based on the ratio of the leakage amplitude in the recording area in which data is recorded to the leakage amplitude in the recording area in which no data is recorded is described. did. However, the optimum recording laser power may be calculated based on the ratio of the leakage amplitude in the recording area in which the data is recorded with respect to the amplitude of the S-shaped signal obtained when focus control is performed. In this case, in step S105 of FIG. 3, it is determined whether or not the ratio of the leakage amplitude in the recording area where the data is recorded with respect to the amplitude of the S-shaped signal satisfies a predetermined condition. Further, in step S106 in FIG. 3, the recording laser power that satisfies the condition of the predetermined condition is calculated as the optimum recording laser power in which the ratio of the leakage amplitude in the recording area where the data is recorded with respect to the amplitude of the S-shaped signal. Is done.

  In the present embodiment, as the “predetermined condition”, a condition that “the ratio of the leakage amplitude in the recording area in which data is recorded to the amplitude of the S-shaped signal is 20% or less” may be used. . Alternatively, in order to further secure the stability of the focus control (or tracking control), as the “predetermined condition”, “the ratio of the leakage amplitude in the recording area where the data is recorded to the amplitude of the S-shaped signal is The condition of “10% or less” may be used.

  The present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the gist or concept of the invention that can be read from the claims and the entire specification, and a recording apparatus and method with such changes In addition, computer programs are also included in the technical scope of the present invention.

1 is a block diagram conceptually showing the basic structure of an information recording apparatus in an example. 1 is a schematic plan view showing a basic structure of an optical disc, and is a schematic conceptual diagram of a recording area structure in the radial direction of the optical disc. 3 is a flowchart conceptually showing a flow of an operation example of the recording apparatus according to the embodiment. It is a block diagram which shows notionally the structural example of a leakage amplitude detection circuit. It is a graph which shows the optimal recording laser power on the graph which shows the correlation with the leakage amplitude of the push pull signal to the focus error signal in the recording area in which the OPC pattern was recorded, and recording laser power. It is a graph which shows notionally the aspect of the fluctuation | variation of the amplitude of a push pull signal, and the leak of the push pull signal to a focus error signal.

Explanation of symbols

1 Recording Device 2 Disk Drive 22 Optical Pickup 221 LD
222 PD
23 LDD
24 CPU
27 OPC section 28-1 Leakage amplitude detection section 28-2 Modulation degree detection section 29 Recording compensation section 3 Host computer

Claims (14)

Recording means for recording recording data on the recording medium by irradiating the recording medium with laser light capable of adjusting power; and
Before starting recording of the recording data, the recording means adjusts the power in a plurality of ways and records calibration data for calibrating the power of the laser light as the recording data on the recording medium. First control means for controlling
First detection means for detecting a predetermined recording quality of the calibration data;
Second detection means for detecting a recorded leakage amplitude indicating a leakage amount of a push-pull signal to a focus error signal obtained by reading the calibration data;
First calculation means for calculating a power at which the predetermined recording quality detected by the first detection means becomes a desired quality as a first optimum power of the laser beam;
When the recorded leakage amplitude corresponding to the first optimum power does not satisfy the first condition, the recorded leakage amplitude satisfies the first condition and the predetermined recording quality is the second condition. A second calculating means for calculating a power satisfying as a second optimum power of the laser beam;
(i) When the recorded leakage amplitude corresponding to the first optimum power satisfies the first condition, the recording data is recorded by irradiating the laser beam with the first optimum power. (Ii) when the recorded leakage amplitude corresponding to the first optimum power does not satisfy the first condition, the recording means is controlled to start the second optimum power. And a second control unit that controls the recording unit to start recording the recording data by irradiating the laser beam.   The second calculating means has a ratio of the recorded leakage amplitude to an unrecorded leakage amplitude indicating a leakage amount of a push-pull signal to a focus error signal obtained in a recording area where the recording data is not recorded. 2. The recording apparatus according to claim 1, wherein a power that satisfies a condition corresponding to the first condition is calculated as a second optimum power of the laser light.   3. The recording apparatus according to claim 2, wherein the power satisfying the ratio according to the first condition is a power having the ratio within ± 6 dB.   The recording apparatus according to claim 2, wherein the power satisfying the ratio according to the first condition is a power having the ratio within ± 3 dB.   The power with which the ratio satisfies the condition according to the first condition is a power at which the recorded leakage amplitude and the unrecorded leakage amplitude are substantially the same. The recording device according to item.   The ratio of the recorded leakage amplitude to the amplitude of the S-shaped signal indicating the capture range obtained when focus control is performed using the focus error signal depends on the first condition. The recording apparatus according to claim 1, wherein the optimum power of the laser beam is calculated as the power satisfying the conditions.   7. The power with which the ratio satisfies the condition according to the first condition is a power in which the recorded leakage amplitude with respect to the amplitude of the S-shaped signal falls within 20%. The recording device described in 1.   7. The power with which the ratio satisfies the condition according to the first condition is a power in which the recorded leakage amplitude with respect to the amplitude of the S-shaped signal falls within 10%. The recording device described in 1.   The recording apparatus according to claim 1, wherein the second detection unit detects an amplitude of the recorded push-pull signal during a track jump. The recording medium includes a spiral or concentric track,
The first control means records the calibration data on one track with one power, and then uses the calibration data on another track different from the one track with another power different from the one power. The recording apparatus according to claim 1, wherein the recording unit is controlled so as to record. The recording medium includes a spiral or concentric track,
The first control means records the calibration data on one track with one power and then interposes a predetermined space between the first track and another power different from the one power. 2. The recording apparatus according to claim 1, wherein the recording unit is controlled so as to record the calibration data on another track existing in the recording medium.   The recording quality becomes the desired quality when the recording quality of the recording data recorded by irradiating the laser beam with the first optimum power or the second optimum power is not the desired quality. The recording apparatus according to claim 1, further comprising adjusting means for adjusting the strategy of the laser beam as described above. A recording method in a recording apparatus comprising recording means for recording recording data on the recording medium by irradiating the recording medium with laser light capable of adjusting power,
Before starting recording of the recording data, the recording means adjusts the power in a plurality of ways and records calibration data for calibrating the power of the laser light as the recording data on the recording medium. A first control step for controlling
A first detection step of detecting a predetermined recording quality of the calibration data;
A second detection step of detecting a recorded leakage amplitude indicating a leakage amount of a push-pull signal to a focus error signal obtained by reading the calibration data;
A first calculation step of calculating a power at which the predetermined recording quality detected in the first detection step becomes a desired quality as a first optimum power of the laser beam;
When the recorded leakage amplitude corresponding to the first optimum power does not satisfy the first condition, the recorded leakage amplitude satisfies the first condition and the predetermined recording quality is the second condition. A second calculation step of calculating a power satisfying the above as a second optimum power of the laser beam;
(i) When the recorded leakage amplitude corresponding to the first optimum power satisfies the first condition, the recording data is recorded by irradiating the laser beam with the first optimum power. (Ii) when the recorded leakage amplitude corresponding to the first optimum power does not satisfy the first condition, the recording means is controlled to start the second optimum power. And a second control step of controlling the recording means so as to start recording the recording data by irradiating the laser beam. By irradiating the recording medium with laser light capable of adjusting power, recording means for recording recording data on the recording medium, and before starting recording of the recording data, while adjusting the power in a plurality of ways, First control means for controlling the recording means to record calibration data for calibrating the power of the laser light as the recording data on the recording medium, and detecting a predetermined recording quality of the calibration data First detection means, second detection means for detecting a recorded leakage amplitude indicating a leakage amount of a push-pull signal into a focus error signal obtained by reading the calibration data, and the first detection means Corresponding to the first optimum power for calculating the power at which the detected predetermined recording quality becomes the desired quality as the first optimum power of the laser beam, When the recorded leakage amplitude does not satisfy the first condition, the laser has a power that satisfies the first condition and the predetermined recording quality satisfies the second condition. Second calculating means for calculating the second optimum power of light; and (i) the first optimum when the recorded leakage amplitude corresponding to the first optimum power satisfies the first condition. The recording means is controlled to start recording of the recording data by irradiating the laser beam of power, and (ii) the recorded leakage amplitude corresponding to the first optimum power is the first When the condition is not satisfied, the recording apparatus includes a second control unit that controls the recording unit to start recording the recording data by irradiating the laser beam with the second optimum power. Con A computer program for a record control to control a Yuta,
Causing the computer to function as at least part of the recording means, the first control means, the first detection means, the second detection means, the first calculation means, the second calculation means, and the second control means. A reproduction control computer program.

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