JP2009015938A - Optical disk recording/playback device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical recording/playback device provided with a recording method for suppressing electric power consumption even when recording to a two-layered optical disk in intermittent recording employed for a DVD-CAM. <P>SOLUTION: The optical recording/playback device includes a laser control means 104 for controlling laser power, a first memory means 108 for storing an optimum recording power value of a first layer and a second layer, a β value measurement means 105 for detecting an asymmetry of a reproduced RF signal, a recording power variation detecting means 107 for detecting a recording power variation in a recording power correction address area, a second memory means 109 for storing the address of the recording power correction address area where the recording power in recording of the first address, and laser control means 106 for outputting a control signal so as to change a laser to the laser control means 104. By reducing the β correction in the first layer, the electric power consumption is suppressed over the entire area of the two-layered optical disks and the recording can be performed without degrading the recording grade. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optical disc recording / reproducing apparatus, and more particularly to recording / reproducing of a two-layer optical disc.

  Conventionally, when recording on an optical disc, learning of recording power is performed using a PCA (Power Calibration Area) further inside than the innermost recording area, and data recording is started with an optimum recording power. is doing. However, even if the recording power is optimum at the start of recording, the optimum recording state may be lost as it goes toward the outer periphery of the disk due to the recording film characteristics of the optical disk, tilt, and the like. In this case, since the recording quality is deteriorated, it is necessary to correct the recording power during recording. Therefore, during the recording of the optical disk, the recording is stopped, the recording power is obtained again, and the interruption / resume process is performed to resume the recording with the obtained recording power.

  During data recording on the optical disc, the recording is stopped and the recording state is detected.If this recording state is worse than the allowable state, the recording power is again obtained, and the recording is restarted from the obtained power. If the recording state is acceptable, recording is resumed without changing the recording power. In this way, recording can be performed over the entire optical disk without degrading the recording quality (see, for example, Patent Document 1).

Further, the β value is generally used to determine the recording state (quality). The β value is a parameter representing the asymmetry of the reproduction signal and is defined as follows.
β value = (A + B) / (A−B)
Here, A is the peak voltage of the envelope of the reproduction RF signal, and B is the bottom voltage. The recording power is changed stepwise, the β value of each recording power is calculated, and the recording power at which the desired β value is obtained is selected as the optimum recording power (see, for example, Patent Document 2).

Further, when recording on a two-layer optical disc, the recording power is learned for each of the first layer and the second layer immediately before the start of recording, and then the first layer is recorded. The second layer is recorded after learning the recording power in the second layer again at the start of recording of the eye (see, for example, Patent Document 3).
JP 2003-331426 A JP 2005-317201 A JP 2006-24246 A

  However, as in data recording with DVD-CAM, for example, “Write” for recording and video data are stored in the memory, for example, the laser power is turned off, or the functional blocks related to LSI recording are turned off. If you are performing intermittent recording that repeats “Idle” without power consumption and does not record, stop recording during recording, detect the recording status, and change the recording power according to the recording status. If it is, “Write” will take time.

  Here, intermittent recording, which is a recording method in DVD-CAM, will be described with reference to FIG.

  In FIG. 5, during the “Idle” period, video data is stored in the memory, so the amount of data stored in the memory increases. When the amount of data stored in the memory exceeds a specific reference value, the “Write” operation is started, and the data stored in the memory is recorded on the disk. Therefore, the data stored in the memory decreases.

  On the other hand, the current consumption of the drive unit for recording data on the optical disc in DVD-CAM is, for example, turning off the laser power during the “Idle” period or performing control while suppressing the functional block current of the LSI related to data recording Therefore, although the current consumption is low, the laser is turned on during the “Write” period to operate the LSI functional blocks related to data recording, so the current consumption is high.

  Furthermore, in the case of recording on a two-layer optical disk, the recording time of the entire disk is longer than that of a single-layer optical disk, so a DVD-CAM mainly for recording on a battery requires a recording method for suppressing power consumption. .

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide an optical disc recording / reproducing apparatus including a recording method for suppressing power consumption even when a two-layer optical disc is recorded.

In order to solve the above-described conventional problems, an optical disk recording / reproducing apparatus of the present invention irradiates an optical disk having a plurality of recording power correction address areas for adjusting laser power with laser light, and stores data and video on the optical disk. An optical disc recording / reproducing apparatus for performing recording or reproduction,
Laser control means for controlling the laser power applied to the optical disc;
The optimum recording power value of the first layer determined in the inner peripheral recording power learning area of the first layer of the optical disc and the second layer determined in the inner or outer recording power learning area of the second layer First storage means for storing an optimum recording power value of the eye;
Β value measuring means for detecting the asymmetry of the reproduction RF signal read from the reflected light from the optical disc;
Recording power change amount detecting means for detecting a recording power change amount using a difference between a target β value preset for the optical disc in the recording power correction address area and a β value detected by the β value measuring means. When,
In the first layer recording, when the recording power change amount is other than 0, the address indicating the position of the recording power correction address area is stored, and the recording power correction address of the second layer corresponding to the address is recorded. Second storage means for causing the β value measuring means to detect the β value when reaching the area;
Using the optimum recording power values of the first layer and the second layer stored in the first storage means and the recording power change amount, the control signal for changing the laser power to the laser control means. Laser control control means for outputting,
It is characterized by having.

  Further, in the optical disk recording / reproducing apparatus of the present invention, the laser control control means is adapted to record the first layer stored in the first storage means when recording the first layer of the optical disk. When the recording power value is the laser power and the recording reaches the recording power correction address area, the β value is detected by the β value measuring unit, and the recording power change obtained by the recording power change amount detecting unit is detected. The value obtained by adding the amount to the optimum recording power value of the first layer is the laser power, and when recording reaches the next recording power correction address area, the β value measuring means and the recording power change amount detection A value obtained by further adding the recording power variation newly obtained by the means is used as the laser power.

  Furthermore, in the optical disk recording / reproducing apparatus of the present invention, the laser control control means is adapted to record the second layer stored in the first storage means when recording the second layer of the optical disk. The recording power value is the laser power, and when recording reaches the recording power correction address area corresponding to the address stored in the second storage means, the β value is detected by the β value measuring means. Then, a value obtained by adding the recording power variation obtained by the recording power variation detecting means to the optimum recording power value of the second layer is used as the laser power, and recording is then stored in the second storage means. When the recording power correction address area corresponding to the recorded address is reached, the recording value newly obtained by the β value measuring means and the recording power change amount detecting means is obtained. Is further added value of change in power that is characterized in that the said laser power.

  Further, in the optical disk recording / reproducing apparatus of the present invention, the laser control control means controls the laser control means to change the laser power stepwise in order to obtain the optimum recording power in the recording power learning area. Is output.

  Furthermore, in the optical disc recording / reproducing apparatus of the present invention, the laser control control means changes the first address from the first address at which the laser power is changed to the second address at which the laser power is subsequently changed at the first address. It is characterized by having a laser power.

  Furthermore, in the optical disc recording / reproducing apparatus of the present invention, the β value measuring means is configured to record the second layer corresponding to the address where the recording power change amount becomes 0 in the recording power correction address area of the first layer. In the power correction address area, the β value is not measured.

  Further, in the optical disk recording / reproducing apparatus of the present invention, the laser control control means may perform recording on the second layer corresponding to the address where the recording power change amount becomes 0 in the recording power correction address area of the first layer. In the power correction address area, the recording power change amount is not obtained.

  As described above, according to the optical disc recording / reproducing apparatus of the present invention, it is possible to perform recording with the optimum laser power and recording with reduced power consumption without deteriorating the recording quality over the entire area of the two-layer optical disc. it can.

  Embodiments of an optical disk recording / playback apparatus according to the present invention will be described below in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram showing a configuration of an optical disc recording / reproducing apparatus according to Embodiment 1 of the present invention. The optical disk reproducing apparatus according to the first embodiment includes a spindle motor 102, an optical pickup 103, a laser control means 104, a β value measurement means 105, a laser control control means 106, a recording power change amount detection means 107, a first storage means 108, The second storage means 109 is included.

  In FIG. 1, a laser control unit 104 controls the laser power of an optical pickup 103 that performs recording and reproduction by irradiating a laser beam to an optical disk 101 that is rotationally driven by a spindle motor 102.

  The β value measuring means 105 detects the asymmetry of the reproduction RF signal read from the reflected light by irradiating the optical disc 101 with laser light of reproduction power from the optical pickup 103.

  The laser control control means 106 stops the recording once in the middle of recording, and uses the difference between the β value detected by the β value measuring means 105 and a preset target β value to confirm the recording state. A change amount is obtained, and a control signal is output to the laser control means 104 so as to change the laser power in accordance with the value of the recording power change amount. Hereinafter, this operation is referred to as β correction. Here, as the target β value, a value recorded in advance on the optical disk may be read out and used, or the target β value is optimal from the value stored in advance in the first storage means 108 or the second storage means 109. The determined value may be selected and used.

  The β correction for adjusting the laser power is performed in a specific area (recording power correction address area) provided in each layer of the optical disc 101. A plurality of recording power correction address areas are provided in each layer of the optical disc 101 from the inner periphery to the outer periphery, and β correction is performed in the address area. For example, a recording power correction address area is provided every 8000h, such as PBA = 38000h, 40000h, 48000h, and β correction is executed. When the target β value> the measured β value, the recording power is increased, and when the target β value <the measured β value, the control signal is output to the laser control unit 104 so as to decrease the recording power. To do. However, when the difference between the target β value and the measured β value is equal to or smaller than a predetermined threshold value, the recording power is not changed, so that no control signal is output to the laser control unit 104.

  Further, the laser control control means 106 performs laser control so as to change the laser power stepwise in order to learn the recording power in the PCA area and obtain the optimum recording power before recording on the optical disc 101. A control signal is output to the means 104.

  The recording power change amount detecting means 107 detects the recording power change amount using the difference between the preset target β value and the β value detected by the β value measuring means 105 in the recording power correction address area. is there.

  The first storage means 108 includes the optimum recording power value of the first layer determined in the inner recording power learning area of the first layer of the optical disc 101 and the inner or outer circumference of the second layer of the optical disc 101. The optimum recording power value of the second layer determined in the recording power learning area is stored.

  The second storage means 109 indicates the position of the recording power correction address area when the recording power change amount detected by the recording power change amount detection means 107 is other than 0 in the recording of the first layer of the optical disc 101. The address is stored, and β correction is executed when the recording reaches the recording power correction address area of the second layer of the optical disc 101 corresponding to the address stored in the second storage means 109.

  Here, the recording method of the double-layer optical disc according to the first embodiment will be described with reference to FIG. Symbols A0 to A6 in the figure represent recording power in the first layer of the optical disc, and symbols B0 to B6 represent recording power in the second layer of the optical disc. Further, a1 to a10 and b1 to b10 indicate recording power correction address areas, and the hatched recording power correction address areas indicate that β correction is performed in these areas.

  First, the optimum recording power A0 of the first layer is obtained in the inner peripheral PCA area of the first layer at the time of starting the disk or at the start of recording. A control signal is output from the laser control control means 106 to the laser control means 104 so that the recording power is varied around the preset initial recording power of the first layer. For example, a control signal is output to the laser control means so as to set a total of 11 levels of recording power in 5 steps up and down every 0.5 mW centering on the initial recording power.

  Next, the β value of each recording power is measured by the β value measuring means 105 from the reproduction RF signal obtained by reproducing the portion recorded at each recording power, and a preset target β of the first layer is set. The recording power closest to the value is the optimum recording power A0 for the first layer.

  Subsequently, the optimum recording power B0 for the second layer is obtained. Using the inner peripheral PCA area or the outer peripheral PCA area of the second layer, as in the case of obtaining A0, the recording power is varied around the preset initial recording power of the second layer, and each recording is performed. The β value of power is obtained, and the recording power closest to the preset target β value of the second layer is set as the optimum recording power B0 of the second layer.

  When the optimum recording power of the second layer is obtained using the inner peripheral PCA area, the recording start position of the second layer is the outer periphery, and therefore an offset for compensating for the recording power difference between the inner and outer periphery. A value may be required.

  The optimum recording powers of the first layer and the second layer obtained here are stored in the first storage means.

  Next, the first layer is recorded with the recording power of A0, and when the recording power correction address area of a1 (for example, PBA = 38000h) is recorded, the first β correction is performed. In this case, the recording power change amount detecting means 107 corrects the recording power change amount obtained from the difference between the preset target β value of the first layer and the β value measured by the β value measuring means 105. The control signal is output from the laser control control means 106 to the laser control means 104 so as to increase the laser power, and the recording power of A1 is obtained.

  Since the recording power has changed, that is, the recording power change amount is other than 0, the address of the recording power correction address area a1 is stored in the second storage means 109.

  Next, when recording is performed up to the recording power correction address area of a2 (for example, PBA = 40000h) with the recording power of A1, the second β correction is performed. Here, since the difference between the preset target β value of the first layer and the β value measured by the β value measuring means is equal to or less than the preset threshold value in the recording power change amount detecting means, the recording power The amount of change was zero. Accordingly, since no control signal is output from the laser control control means to the laser control means, the recording power remains at A1 and recording is performed up to the recording power correction address area a3.

  Since the recording power has not changed, that is, the recording power change amount is 0, the address of the recording power correction address area a2 is not stored in the second storage means.

  In this way, recording is performed up to the outermost periphery of the first layer, and the address of the recording power correction address area in which the recording power is changed is stored in the second storage means by β correction in the middle. In FIG. 2, the addresses where the recording power is A1, A2, A3, A4, A5, A6, that is, the addresses of the recording power correction address areas a1, a3, a5, a6, a8, a9 are stored in the second storage means. Stored.

  Next, when recording the second layer, the optimum recording power B0 of the second layer is read from the first storage means and recorded up to the recording power correction address area b10.

  When recording to the recording power correction address area when recording the first layer, recording is temporarily stopped and β correction is performed, but when recording the second layer, it is stored in the second storage means. Β correction is performed only at addresses corresponding to existing addresses. In FIG. 2, since the address of the recording power correction address area of a10 corresponding to the recording power correction address area of b10 is not stored in the second storage means, β correction is not performed in the recording power correction address area of b10. That is, recording is performed up to the next recording power correction address area of b9 with the recording power of B0.

  Since the address of the recording power correction address area a9 is stored in the second storage means, β correction is performed in the recording power correction address area b9 corresponding to this address. Here, the recording power change amount detecting means 107 has a negative recording power change amount obtained from the difference between the preset target β value of the second layer and the β value measured by the β value measuring means 105. A control signal was output from the laser control control means 106 to the laser control means 104 so as to decrease the laser power, and a recording power of B1 was obtained. Recording is then performed up to the address stored in the second storage means with the recording power of B1, that is, the recording power correction address area of b8 corresponding to the address of the recording power correction address area of a8, where β correction is performed. The recording power of B2 was obtained.

  In this way, recording is performed up to the inner periphery of the second layer, but β correction is performed on the first layer, and recording on the second layer corresponding to the address of the recording power correction address area in which the recording power has changed is performed. Since β correction is performed only in the power correction address area, the number of β corrections can be reduced as compared with the case of recording the first layer.

  In the recording method described above, the two-layer optical disc is formed by laminating discs having the same recording film characteristics, and the recording characteristics from the inner circumference to the outer circumference are the same as those in the first layer and the second layer at the same radial position. This is based on the fact that the layer has substantially the same characteristics.

  As described above, not only the first layer but also the second layer can be recorded over the entire disk without deteriorating the recording quality.

  Here, in order to show the effect of the first embodiment, a DVD-CAM recording method when β correction is performed will be described with reference to FIG.

  In FIG. 4, when the video data stored in the memory during the “Idle” period exceeds a specific reference value, the “Write” operation is started, and the video data stored in the memory is recorded on the optical disk. When the address for β correction is reached during recording, the recording is interrupted once and β correction is performed. Since the video data stored in the memory is not recorded on the optical disc during the β correction, the “Write” period becomes longer by the time required for the β correction. The longer the “Write” period, the shorter the “Idle” period, and the higher the power consumption. This is the same when recording either the first layer or the second layer of a two-layer optical disc, but the recording power of the second layer is higher than the recording power of the first layer. Therefore, the power consumption of the second layer is higher than that of the first layer.

  Therefore, if the recording method for reducing the β correction in the second layer is used as in the first embodiment, the time required for the β correction can be reduced as shown in FIG. Since the “Write” period is short and the “Idle” period can be long, the power consumption can be suppressed as compared with the prior art.

  As described above, in the first embodiment, the β correction in the second layer is executed only at the address where the recording power is expected to change, and the recording in the second layer is performed with the optimum recording power. Since recording can be performed, power consumption can be suppressed, and recording can be performed without degrading the recording quality over the entire area of the two-layer optical disk.

  Moreover, temperature rise can also be suppressed by suppressing power consumption. The internal temperature of the drive unit of the DVD-CAM is higher than the environmental temperature, and when the internal temperature of the drive becomes high, a recording stop process may be entered due to various factors. Therefore, it is desirable to suppress the temperature rise. It is.

  The optical disc recording / reproducing apparatus according to the present invention has an effect that recording can be performed with an optimum laser power and recording with reduced power consumption without deteriorating the recording quality over the entire area of the two-layer optical disc. In particular, it is useful as a recording / reproducing apparatus for a two-layer optical disk.

1 is a block diagram of an optical disc recording / reproducing apparatus according to Embodiment 1 of the present invention. Explanatory drawing about the recording method of the double layer optical disk in Embodiment 1 of this invention Explanatory drawing about the recording method of DVD-CAM when (beta) correction in Embodiment 1 of this invention is not performed Explanatory drawing about the recording method of DVD-CAM at the time of performing beta correction in Embodiment 1 of the present invention Explanatory drawing about the intermittent recording method in DVD-CAM in the subject which the invention of this invention tends to solve

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Optical disk 102 Spindle motor 103 Optical pick-up 104 Laser control means 105 (beta) value measurement means 106 Laser control control means 107 Recording power change amount detection means 108 First storage means 109 Second storage means

Claims (7)

An optical disc recording / reproducing apparatus for irradiating an optical disc having a plurality of recording power correction address areas for adjusting laser power with laser light and recording or reproducing data or video on the optical disc,
Laser control means for controlling the laser power applied to the optical disc;
The optimum recording power value of the first layer determined in the inner peripheral recording power learning area of the first layer of the optical disc and the second layer determined in the inner or outer recording power learning area of the second layer First storage means for storing an optimum recording power value of the eye;
Β value measuring means for detecting the asymmetry of the reproduction RF signal read from the reflected light from the optical disc;
Recording power change amount detecting means for detecting a recording power change amount using a difference between a target β value preset for the optical disc in the recording power correction address area and a β value detected by the β value measuring means. When,
In the first layer recording, when the recording power change amount is other than 0, the address indicating the position of the recording power correction address area is stored, and the recording power correction address of the second layer corresponding to the address is recorded. Second storage means for causing the β value measuring means to detect the β value when reaching the area;
Using the optimum recording power values of the first layer and the second layer stored in the first storage means and the recording power change amount, the control signal for changing the laser power to the laser control means. Laser control control means for outputting,
An optical disc recording / reproducing apparatus having: When recording the first layer of the optical disc, the laser control control means uses the optimum recording power value of the first layer stored in the first storage means as the laser power, and recording is performed. When the recording power correction address area is reached, a β value is detected by the β value measuring means, and the recording power change obtained by the recording power change detecting means is determined as the optimum recording power of the first layer. The value added to the value is used as the laser power, and when the recording reaches the next recording power correction address area, the recording power change amount newly obtained by the β value measuring means and the recording power change amount detecting means The optical disk recording / reproducing apparatus according to claim 1, wherein a value obtained by further adding is used as the laser power. When recording the second layer of the optical disc, the laser control control means uses the optimum recording power value of the second layer stored in the first storage means as the laser power, and recording is performed. When the recording power correction address area corresponding to the address stored in the second storage means is reached, the β value is detected by the β value measuring means and is obtained by the recording power change amount detecting means. The value obtained by adding the recorded recording power change amount to the optimum recording power value of the second layer is used as the laser power, and the recording power correction corresponding to the address stored next in the second storage means When the address area is reached, a value obtained by further adding the recording power change newly obtained by the β value measuring means and the recording power change detecting means is added to the laser power. Optical disc recording and reproducing apparatus according to claim 1,. The laser control control means outputs a control signal to the laser control means so as to change the laser power stepwise in order to obtain an optimum recording power in the recording power learning area. 2. An optical disc recording / reproducing apparatus according to 1. The laser control control means sets the laser power changed at the first address from the first address at which the laser power is changed to the second address at which the laser power is changed next. The optical disk recording / reproducing apparatus according to claim 1. The β value measuring means measures the β value in the recording power correction address area of the second layer corresponding to the address where the recording power change amount becomes 0 in the recording power correction address area of the first layer. 2. The optical disk recording / reproducing apparatus according to claim 1, wherein the optical disk recording / reproducing apparatus is not performed. In the recording power correction address area of the second layer corresponding to the address where the recording power change amount becomes 0 in the recording power correction address area of the first layer, the laser control control means The optical disc recording / reproducing apparatus according to claim 1, wherein:

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