JP3995838B2 - Optical information recording / reproducing apparatus and recording power setting method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an information recording / reproducing apparatus capable of optically recording information on an optical disc, and a recording power setting method thereof.
[0002]
[Prior art]
Various types of optical discs such as a read-only type, a write-once type, and a rewritable type have been put into practical use, and the recording / reproducing apparatus condenses a light beam from a light source such as a semiconductor laser on a track with an objective lens, Information is recorded and reproduced by forming a small light spot.
[0003]
Here, FIG. 9 shows a configuration example of the optical pickup optical system of the recording / reproducing apparatus. The light beam emitted from the laser light source 1 is converted into parallel light by the collimator lens 2 and divided into three beams (main beam and two sub beams) by the grating 3, and the polarization beam splitter 4, the quarter-wave plate 5 and the objective lens. 6 is irradiated as a minute light spot on the track of the optical disc 7 and between the tracks. Then, the reflected light from the optical disk 7 is returned to the polarizing beam splitter 4 through the objective lens 6 and the quarter-wave plate 5, reflected by the reflecting surface of the polarizing beam splitter 4, and the condenser lens 8 and the cylindrical lens 9. Is received by a light receiving element 10 having a plurality of light receiving portions. Various signals such as an information reproduction signal, a tracking error signal, and a focus error signal are detected by the signal detection circuit 11 from the photoelectric conversion output by the light receiving element 10. Description of the above-described various signal detection methods is described in Japanese Patent Application Laid-Open No. 9-212891 and the like, and will not be described.
[0004]
On the other hand, information is recorded on the optical disk 7 by irradiating a part of the recording layer on the optical disk 7 with a laser beam to raise the temperature of the recording layer. In the optical disc 7 on which recording using such heat is performed, the optimum recording power is determined by the characteristics of the optical disc 7, the peak intensity of the spot on the optical disc 7, and the like. Therefore, for example, when a disc tilt occurs in which the optical disc 7 is tilted with respect to the objective lens 6, the optimum recording power to be emitted from the laser light source 1 changes as shown in FIG. In other words, the laser beam is not perpendicular to the surface direction of the optical disc 7, but is incident obliquely. If the laser power emitted from the objective lens 6 is not increased as compared with the case where the laser beam is not tilted, recording is performed. It is not possible to obtain the necessary temperature rise.
[0005]
Further, when the objective lens 6 deviates from the optical axis due to tracking or the like, the spot itself on the optical disk 7 becomes large and the peak intensity is lowered, so that the recording power itself changes. Therefore, as shown in FIG. 11, the optimum recording power changes according to the objective lens position. Similarly, even if the beam spot on the optical disc 7 is defocused, the spot diameter increases and the peak intensity decreases, so that the optimum recording power changes according to the defocus amount as shown in FIG. .
[0006]
Therefore, in order to solve such a problem, a recording / reproducing apparatus for controlling the laser power during recording has been proposed. For example, in Japanese Patent Laid-Open No. 9-212891, a movement interlocking mechanism is provided so that an optical axis shift does not occur even when the objective lens is tracked. The laser beam is divided into a main beam and a sub beam, and the sub beam is divided into those of the optical disk. A focus error signal generated from the detection result of the main beam and the tilt is generated by forming an image between the tracks and adding a tracking error signal generated from a plurality of reflected lights to generate a tilt signal corresponding to the disc tilt. The recording power is controlled corresponding to the signal. As a result, the recording power is controlled in accordance with a decrease in the peak intensity of the beam spot due to the disc tilt.
[0007]
Also, for example, in Japanese Patent Laid-Open No. 9-282696, the optimum recording power is measured in advance on the inner and outer circumferences before information is recorded in the user area, and the optimum recording power for an arbitrary zone is obtained by linear approximation.
[0008]
[Problems to be solved by the invention]
Incidentally, the optimum recording power depends not only on the disc tilt but also on the combination of the optical disc and the recording / reproducing apparatus, and cannot be determined uniquely. That is, even with the same apparatus, if the sensitivity of the optical disk is different, the same recording mark shape cannot be obtained even if recording is performed with the same power. Even with the same disk, the recording power differs due to variations in the beam profile of each apparatus. For this reason, the optimum recording power for a combination of an arbitrary optical disc and recording / reproducing apparatus is not known unless it is measured.
[0009]
However, in Japanese Patent Laid-Open No. 9-212891, the optimum recording power corresponding to the detected tilt signal and the optimum recording power corresponding to the detected focus error signal are adjusted in advance, so that recording is performed under different conditions. In such a case, there is a problem that the recording power is not necessarily an optimum value. For example, as shown in FIG. 13, if the optimum recording power corresponding to a tilt signal of a certain level TL0 is adjusted to PW0, an optical disc having a lower sensitivity than that used for the adjustment is used. The optimum recording power is only PW0 ′ larger than PW0, whereas only the power of PW0 can be obtained. The same effect also occurs on the focus error signal, and recording is performed at a lower PW0 with respect to the optimum recording power PW0 ′, so that a mark smaller than an appropriate recording mark is formed. . In addition, a movement interlocking mechanism is provided to create a tilt signal, and the configuration is complicated.
[0010]
On the other hand, in Japanese Patent Laid-Open No. 9-282696, since it corresponds to a change in the zone number, and therefore, a change in the address, if the change in the optimum recording power does not follow the address change linearly, it is not necessarily corrected properly. There is a problem that you can not.
[0011]
An object of the present invention is to provide an optical disc that can accurately record and reproduce information by optimally matching the recording power for any combination of an optical disc and a recording and reproducing device without adding a special configuration. It is to provide an information recording / reproducing apparatus and a recording power setting method thereof.
[0012]
[Means for Solving the Problems]
  The optical information recording / reproducing apparatus of the present invention is an information recording / reproducing apparatus for optically recording / reproducing information on / from an optical disc in which test write areas exist at a plurality of positions. Optimal power detecting means for obtaining the optimum recording power in the test write area, amplitude detecting means for detecting the amplitude of the reproduction signal of the preformat section, and detection of the amplitude detecting means and the optimal power detecting means in each test write area In response to the result, optimum power calculation means for obtaining optimum recording power corresponding to the amplitude of the reproduction signal of the preformat section in an arbitrary area, and recording power control for performing recording at the recording power obtained by the optimum power calculation means IncludingIt is.
[0013]
  Further, the recording power setting method for the optical information recording / reproducing apparatus of the present invention includes a plurality of recording power setting methods for an information recording / reproducing apparatus for optically recording / reproducing information on / from an optical disc having test light areas at a plurality of positions. Recording / reproduction in each test write area, obtaining the optimum recording power in each test write area, detecting the amplitude of the reproduction signal of the preformat portion in each test write area, and optimum recording in each test write area From the power and playback signal amplitude, find the optimum recording power corresponding to the playback signal amplitude of the preformat section in an arbitrary area.Is.
[0014]
According to the above configuration, when performing a test write, the optimum recording power obtained from the reproduction signal of the test-written signal and the amplitude of the reproduction signal of the preformat portion in the test write area are determined in association with each other, The optimum recording power corresponding to an arbitrary amplitude value of the reproduction signal of the preformat portion can be obtained from the result of test writing at a plurality of locations. For example, the data points at each test write location are approximated by connecting them with straight lines or broken lines, and the optimum recording power at any location other than the test write area is determined based on the amplitude of the reproduction signal of the preformat section at that location. From the straight line or broken line approximation, that is, by interpolating data of adjacent data points.
[0015]
  As a reproduction signal of the preformat part,TheTracking error signal when crossing rackIssueCan be used,thisAs described above, the change in the signal amplitude appears corresponding to the change in the optimum recording power.
[0016]
  Therefore, by adding a test write for each combination of an optical disc and a recording / reproducing apparatus without adding a special configuration, the test write is performed at any location other than the test write area. Part, Tracking error when crossing tracksBased on the amplitude of the signal, the optimum recording power can be obtained, and the recording power can be optimally matched, whereby accurate information recording / reproduction can be performed.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS.
[0018]
FIG. 1 is an explanatory diagram illustrating the configuration of an optical pickup optical system, a signal detection system, and a control system in an optical disc recording / reproducing apparatus according to an embodiment of the present invention. The optical pickup optical system 12 and the optical disk 7 are the same as those in FIG. That is, the light beam emitted from the laser light source 1 becomes parallel light by the collimator lens 2 and is divided into three beams (main beam and two sub beams) by the grating 3, and the polarization beam splitter 4, the quarter-wave plate 5 and Light is irradiated as a minute light spot on and between tracks of the optical disk 7 through the objective lens 6. Then, the reflected light from the optical disk 7 is returned to the polarizing beam splitter 4 through the objective lens 6 and the quarter-wave plate 5, reflected by the reflecting surface of the polarizing beam splitter 4, and the condenser lens 8 and the cylindrical lens 9. Is received by a light receiving element 10 having a plurality of light receiving portions. Various signals such as an information reproduction signal, a tracking error signal, and a focus error signal are detected by the signal detection circuit 11 from the photoelectric conversion output by the light receiving element 10. The description of the above-described various signal detection methods is described in JP-A-9-212891.
[0019]
The optical disk 7 can use several tracks and several sectors having specific header information as a test write area. Opposite to the disk surface of the optical disk 7, an optical pickup optical system 12 for writing and reading recording marks is arranged.
[0020]
A recording power control circuit 14 is connected to the laser light source 1. The recording power control circuit 14 creates a recording signal for controlling the output of the laser light source 1 in response to a control signal corresponding to a mark to be recorded from the system controller 13. The laser light source 1 emits a laser beam corresponding to the recording signal, and a recording mark is formed as described above. In the case of a magneto-optical disk, recording is performed in cooperation with a magnetic head (not shown).
[0021]
On the other hand, the tracking error signal generated by the signal detection circuit 11 from the output signal of the light receiving element 10 is supplied to the tracking control circuit 15 and the amplitude detection circuit 16, and the generated focus error signal is supplied to the focusing control circuit 17. The generated information reproduction signal is supplied to the system controller 13. The tracking control circuit 15 and the focusing control circuit 17 perform tracking control and focusing control of the optical pickup in response to the tracking error signal and the focus error signal, respectively. The amplitude detection circuit 16 detects the amplitude of the tracking error signal when the beam spot crosses the track on the optical disc 7 in response to the tracking error signal. The detected amplitude information is supplied to the system controller 13 realized by a microcomputer or the like. The system controller 13 cooperates with the memory 18 to output the information reproduction signal to the demodulator circuit in the subsequent stage, and performs optimum recording power setting processing described later in response to the information reproduction signal and the amplitude information.
[0022]
Here, the relationship between the amplitude of the reproduction signal of the preformat section and the optimum recording power will be described. The optimum recording power is determined by the peak intensity of the beam spot on the optical disc 7 or the like. However, under the influence of the tilt of the optical disc 7, the optical axis shift of the objective lens 6, and the defocus, the peak intensity of the beam spot is lowered, and it is necessary to increase the optimum recording power.
[0023]
FIG. 2 is a graph showing changes in the optimum recording power with respect to changes in the tilt angle of the optical disc 7. As described above, it is understood that the optimum recording power is smallest when the tilt angle is 0 °, and it is necessary to increase the optimum recording power as the tilt angle increases.
[0024]
On the other hand, FIG. 3 is a graph showing the change in the amplitude of the tracking error signal with respect to the change in the tilt angle of the optical disc 7 when the beam spot crosses the track formed by the preformatted lands and grooves. From FIG. 3, it is understood that the amplitude of the tracking error signal is maximized when the tilt angle is 0 °, and that the peak intensity of the beam spot decreases as the tilt angle increases, and the amplitude decreases.
[0025]
Therefore, from FIG. 2 and FIG. 3, the change characteristic of the tracking error signal amplitude with respect to the change of the optimum recording power as shown in FIG. 4 can be obtained. From FIG. 4, even when the optical disc 7 is tilted and the optimum recording power changes, the amplitude of the tracking error signal also changes in accordance with the change, and the recording power changes in accordance with the amplitude of the tracking error signal. Thus, it is understood that recording is always possible with the optimum recording power.
[0026]
Utilizing this, in the present invention, when the optical disc 7 is first inserted, the recording power according to the combination of the optical disc 7 and the recording / reproducing apparatus such as the sensitivity of the optical disc 7 to the laser beam from the laser light source 1 is recorded. The system controller 13 causes the recording power control circuit 14 to perform test write in a plurality of areas of several tracks and several sectors having the specific header information determined in advance, and the signal detection circuit 11 The optimum recording power is obtained from the detected result and stored in the memory 18. At the same time, the system controller 13 causes the tracking control circuit 15 to generate a track jump, obtains the amplitude of the tracking error signal from the detection result of the signal detection circuit 11, and stores it in the memory 18.
[0027]
The test light is recorded while changing the recording power from low power to high power, and each time the information reproduction signal supplied from the signal detection circuit 11 is measured, the laser power that minimizes error and jitter is optimally recorded. This is a process for determining power.
[0028]
FIG. 5 is a graph showing a test write result when the test write area is two places on the outer periphery and the inner periphery of the optical disc 7. The optimum recording power in the outer test write area is Pw1, and the tracking error signal amplitude is A1. The optimum recording power in the inner test write area is Pw2, and the tracking error signal amplitude is A2.
[0029]
Thus, when the test write is completed and the actual recording is performed, if the difference between the amplitudes A1 and A2 of the tracking error signal is equal to or less than a predetermined threshold Ath, the optimum recording power is Pw1, Pw2, or an average value thereof is arbitrary. When the difference between the amplitudes A1 and A2 is larger than a predetermined threshold Ath, the optimum recording power Pw in an arbitrary recording area is used as a tracking error signal in that recording area. As shown by the following equation, the amplitude A of the two is approximated by a straight line L1 between the data points obtained in the two test write regions.
Pw = a · A + b (1)
However,
a = (Pwl−Pw2) / (Al−A2) (2)
b = (Pw2, A1-Pwl, A2) / (A1-A2) (3)
It is.
[0030]
FIG. 6 is a flowchart for explaining the optimum recording power setting processing operation by the test write as described above. In FIG. 6, it is assumed that the test write areas exist on the inner circumference, the middle circumference, and the outer circumference. First, in step S1, a variable TN indicating the number of test write operations is initialized to zero. In step S2, the optical pickup is moved to the outer test light area on the optical disk 7.
[0031]
Next, in step S3, the amplitude of the tracking error signal supplied from the signal detection circuit 11 is detected by the amplitude detection circuit 16, and the amplitude A1 of the tracking error signal when it reaches the test write area is supplied to the system controller 13. Is done. In step S4, the system controller 13 performs the above-described test write operation to obtain the optimum recording power Pw1. In step S5, the optimum recording power Pw1 and the amplitude A1 are stored in the memory 18.
[0032]
When the test write operation is completed once, subsequently, in step S6, 1 is added to the variable TN, and the variable TN becomes 1. In step S7, the value of the variable TN indicates that the test write operation has been completed on the outer periphery. Is returned to step S2 and the optical pickup 12 is moved to the inner test light area. In steps S3 to S5, the optimum recording power Pw2 and amplitude in the inner test write area are determined. A2 is stored in the memory 18.
[0033]
When the test write is performed twice, the variable TN becomes 2 in step S6, and the process proceeds from step S7 to step S8. In step S8, it is determined whether or not the difference between the amplitudes A1 and A2 is larger than the threshold value Ath. If not, in step S9, the amplitudes A1 and A2 and the optimum recording powers Pw1 and Pw2 are Based on Equations 2 and 3, the slope a and the intercept b for obtaining the optimum recording power Pw in an arbitrary area are obtained, and these data are stored in the memory 18 as interpolation information in step S10.
[0034]
When the difference between the amplitudes A1 and A2 at the two inner and outer peripheral points is equal to or smaller than the threshold value Ath in step S8, the denominators of the equations 2 and 3 are considered to be small, and the reliability of the interpolation information is lowered. Therefore, the following processing is performed. When it is determined in step S11 that the test write has been completed at two points on the inner and outer circumferences, the process returns to step S2 to perform the test write on the middle circumference, and the test write is performed in steps S3 to S5. The amplitude A3 and the optimum recording power Pw3 are stored in the memory 18, and the variable TN is set to 3 in step S6, thereby moving again from step S7 to step S8. When either the difference between the amplitudes A1 and A3, the difference between A2 and A3, or both stored in the memory 18 is larger than the threshold Ath, the amplitude data 2 of the larger combination of the two differences In step S9, interpolation information for the slope a and the intercept b is generated from the two pieces of optimum recording power data.
[0035]
Further, when step S8 ends and the difference between the amplitudes A1 and A3 and the difference between A2 and A3 are both equal to or less than the threshold Ath, the optimum recording power on the optical disc 7 is considered to be substantially the same. If it is determined in step S11 that the test light has been performed at three points on the inner, middle, and outer periphery, the inclination a is set to 0 and the intercept b is set to Pw3 in step S9.
[0036]
In the above description, b = Pw3, but any of the optimum recording powers Pwl, Pw2, and Pw3 of the inner, middle, and outer circumferences may be used, or three averages may be used. Further, the test write may be performed at four points or more, and may be performed at a timing other than when the optical disc 7 is inserted.
[0037]
Based on the interpolation information in the memory 18 obtained by the above-described optimum recording power setting process, the system controller 13 performs the actual recording power interpolation process in order to obtain the optimum recording power outside the test write area. FIG. 7 is a flowchart for explaining the actual recording power interpolation processing operation. First, in step S21, the optical pickup is moved to the track to be recorded. Next, in step S 22, the amplitude A of the tracking error signal from the signal detection circuit 11 when reaching the track is detected by the amplitude detection circuit 16 and input to the system controller 13. Subsequently, in step S23, the system controller 13 calls the slope a and the intercept b of the straight line L1 from the memory 18, and approximates the optimum recording power Pw at the track using the equation (1). Based on this, the system controller 13 supplies a control signal to the recording power control circuit 14 in step S24. As a result, the laser light source 1 supplied with the recording signal from the recording power control circuit 14 can perform recording with a laser power approximating the optimum recording power of the track.
[0038]
With such a configuration, the relationship between the amplitude A of the tracking error signal and the optimum recording power Pw is determined by the test write for each combination of differences in sensitivity of the optical disc 7 and variations in characteristics of the recording / reproducing apparatus. Since it is approximated by the straight line L1, the inclination a and the intercept b are generated as interpolation information, and the recording power at an arbitrary position to be recorded is obtained from the amplitude A of the tracking error signal at that position by interpolation processing. The optimum recording power corresponding to the peak intensity of the beam spot on the optical disc 7 can always be obtained even in the data recording area where the optimum recording power Pw cannot be obtained by the test write without adding a special configuration. Therefore, the recording power can always be optimally matched, and accurate information recording / reproduction can be performed.
[0039]
In the above description, the disk tilt of FIG. 2 is illustrated, but the correction effect is also exhibited with respect to the overall decrease in the peak intensity of the beam spot due to the optical axis shift of the objective lens 6 and the defocusing of the beam spot. The Further, the present invention can be applied not only to a disk having a constant linear velocity but also to a disk having a variable linear velocity such as CAV and ZCAV by adding a linear velocity correction.
[0040]
Furthermore, although a test write is performed in advance when the optical disc 7 is inserted to obtain the relationship between the amplitude A of the tracking error signal and the optimum recording power Pw, there is a sufficient margin in the recording speed compared to the transfer speed of the recording data. In some cases, or when the capacity of the recording data buffer is sufficiently large, or when the required tracking time is short, etc., test writing is performed while recording data, and the optimum recording power is corrected and updated as needed. Also good. In the above example, the relationship between the optimum recording power and the amplitude of the tracking error signal is set by linear interpolation. However, when three or more test write areas are provided, other approximation methods such as least square approximation are used. You may do it. Furthermore, in the above example, the amplitude of the tracking error signal when accessing the test write area is used for the optimum recording power setting process. However, the amplitude after the test write operation may be used, or during the test write operation. Alternatively, an average of amplitudes obtained by a plurality of track jump operations may be used.
[0041]
The following will describe another embodiment of the present invention with reference to FIG.
[0042]
FIG. 8 is a graph showing changes in the optimum recording power used in an optical disc recording / reproducing apparatus according to another embodiment of the present invention. The optical disc used in this example has a groove preformatted, and the amplitude detection circuit 16 generates a radial push-pull signal when passing in the track direction through an address portion meandering on one side or both sides of the groove. The change with respect to the change in the tilt angle of the amplitude is obtained, and the change in the optimum recording power with respect to the change in the amplitude of the radial push-pull signal shown in FIG. 8 is obtained from the change characteristic and the change characteristic shown in FIG. An address portion meandering on both sides of the groove is disclosed in Japanese Patent Laid-Open No. 63-103454, and an address portion meandering on one side of the groove is disclosed in Japanese Patent Laid-Open No. 5-314538. ing.
[0043]
Similarly, when an uneven mark is preformatted on the optical disc, the amplitude of the tangential push-pull signal when the mark passes in the track direction can also be used.
[0044]
  Furthermore, in order to cope with the variation in reflectance in the optical disc, the amplitude of the tracking error signal divided by the reflected light amount signal (total signal) may be used. Also, in the case of an optical disc that records on both the land and the groove, a test write area is provided on both, and the optimum recording power setting process and the recording power interpolation process are performed on each of them, so that each of the land and the groove is recorded. An optimum recording power can be set.As described above, the optical information recording / reproducing apparatus of the present invention is an information recording / reproducing apparatus for optically recording / reproducing information on / from an optical disc having test write areas at a plurality of positions. Optimal power detection means for performing reproduction and obtaining optimum recording power in each test write area, amplitude detection means for detecting the amplitude of the reproduction signal of the preformat section, the amplitude detection means in each test write area and the optimum In response to the detection result of the power detection means, the optimum power calculation means for obtaining the optimum recording power corresponding to the amplitude of the reproduction signal of the preformat portion in an arbitrary area, and the recording with the recording power obtained by the optimum power calculation means Recording power control means for carrying out A tracking error signal when cutting, a radial push-pull signal when passing in the track direction through the address portion represented by the meandering of the preformatted groove, or when passing a preformatted uneven mark in the track direction These tangential push-pull signals can be used, and the change in the signal amplitude appears corresponding to the change in the optimum recording power as described above.
[0045]
【The invention's effect】
  As described above, the optical information recording / reproducing apparatus and the recording power setting method according to the present invention provide the optimum recording power obtained from the reproduction signal of the test-written signal and the test write area when performing test write., Tracking error when crossing tracksThe signal amplitude is determined in association with the result of the test write at multiple locations, and in any recording area, Tracking error when crossing tracksThe optimum recording power corresponding to the amplitude value of the signal is obtained from straight line or broken line approximation.
[0046]
  Therefore, without adding a special configuration, even for any combination of an optical disc and a recording / reproducing apparatus, by performing a test write for each combination, any location other than the test write area, Of that part, Tracking error when crossing tracksBased on the amplitude of the signal, the optimum recording power can be obtained, and the recording power can be optimally matched, whereby accurate information recording / reproduction can be performed.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram illustrating the configuration of an optical pickup optical system, a signal detection system, and a control system in an optical disc recording / reproducing apparatus according to an embodiment of the present invention.
FIG. 2 is a graph showing a change in optimum recording power with respect to a change in tilt angle of an optical disc.
FIG. 3 is a graph showing a change in amplitude of a tracking error signal with respect to a change in tilt angle of an optical disc when a beam spot crosses a track formed by preformatted lands and grooves.
FIG. 4 is a graph showing a change in tracking error signal amplitude with respect to a change in optimum recording power.
FIG. 5 is a graph showing test write results when the test write area is two places on the outer periphery and the inner periphery of the optical disc.
FIG. 6 is a flowchart for explaining an optimum recording power setting processing operation by a test write.
FIG. 7 is a flowchart for explaining an actual recording power setting process;
FIG. 8 is a graph showing changes in optimum recording power used in an optical disc recording / reproducing apparatus according to another embodiment of the present invention.
FIG. 9 is a diagram illustrating a configuration example of a general optical pickup optical system of an optical disc recording / reproducing apparatus.
FIG. 10 is a diagram showing the relationship between disc tilt and optimum recording power.
FIG. 11 is a diagram illustrating a relationship between objective lens shift and optimum recording power.
FIG. 12 is a diagram illustrating a relationship between defocus and optimum recording power.
FIG. 13 is a diagram showing the relationship between disc tilt and optimum recording power when optical discs having different sensitivities are used.
[Explanation of symbols]
1 Laser light source
2 Collimator lens
3 grating
4 Polarizing beam splitter
5 1/4 wave plate
6 Objective lens
7 Optical disc
8 Condensing lens
9 Cylindrical lens
10 Light receiving element
11 Signal detection circuit (optimum power detection means)
12 Optical pickup optical system
13 System controller (optimum power detection means, optimum power calculation means)
14 Recording power control circuit (recording power control means)
15 Tracking control circuit
16 Amplitude detection circuit (amplitude detection means)
17 Focusing control circuit
18 memory

Claims (2)

In an information recording / reproducing apparatus for optically recording / reproducing information on / from an optical disc having test light areas at a plurality of positions,
Optimal power detection means for performing recording / reproduction in each of the plurality of test write areas and obtaining optimal recording power in each test write area,
Amplitude detecting means for detecting the amplitude of the tracking error signal when crossing the track;
Optimal power calculation means for obtaining an optimum recording power corresponding to the amplitude of the tracking error signal when crossing a track in an arbitrary area in response to the detection results of the amplitude detection means and the optimum power detection means in each test write area When,
And an optical information recording / reproducing apparatus including recording power control means for performing recording with the recording power obtained by the optimum power calculating means. In a recording power setting method of an information recording / reproducing apparatus for optically recording / reproducing information on / from an optical disc having test light areas at a plurality of positions,
Perform recording and playback in each of the multiple test write areas, and find the optimum recording power for each test write area.
In each test light area, the amplitude of the tracking error signal when crossing the track is detected,
Optical information recording characterized in that an optimum recording power corresponding to the amplitude of the tracking error signal when traversing a track in an arbitrary area is obtained from the optimum recording power and the amplitude of the tracking error signal in each test write area. Recording power setting method for playback apparatus.

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