JP2005190599A - Optical disk recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk recording device in which recording characteristics are stabilized even when disturbance occurs. <P>SOLUTION: At the time of OPC (at the time of learning), a first amount X of reproducing reflected light is obtained from a test area of a recording object disk (the optical disk), at the time just before data logging starts, a second amount Y of a reproducing reflected light is obtained from a data area of the recording object disk, a B/A target value compensation part 10 compensates a target B/A learning value on the basis of the amounts X and Y of the first and the second reproducing reflected light. This compensated target B/A value for the learning value is stored in a B/A target value storing part 21 for a ROPC part 20. The optical disk recording device performs record power control in accordance with this compensated target B/A value for the learning value. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical disk recording apparatus for stably recording data signals at high speed and high density on an additionally recordable / rewritable optical disk.

  Conventional optical disk recording apparatuses control laser power (light intensity) based on the amount of light reflected from the optical disk during data recording (see, for example, Patent Document 1). Hereinafter, recording power control in the conventional optical disk recording apparatus will be described.

For example, when recording data signals on write-once optical disc such as DVD-R, a general optical disc recording apparatus adds the parity for error correction to the data signal, further EFM (E ight to F ourteen M the signal modulation) and recording was performed.

  The modulated signal is given nine time widths 3T to 11T obtained by multiplying a predetermined reference time width T by 3 to 11 as a time width when the signal level is high level or low level. Yes.

  A conventional optical disc recording apparatus irradiates a pulsed laser beam based on the modulated signal, for example, when the signal level is high, and forms pits (marks) in the recording layer of the optical disc, thereby producing an optical disc. The data signal was recorded on the. Note that portions other than the mark period are generally called spaces.

  Hereinafter, the laser light forming the pits is referred to as first laser light, and the laser power (light intensity) of the first laser light is referred to as recording power. Similarly, laser light that does not form pits, that is, laser light that forms spaces, is referred to as second laser light, and laser power (light intensity) of the second laser light is referred to as reproduction power. Note that the second laser beam is also used during disk reproduction.

  A conventional optical disc recording apparatus performs a recording power learning process (hereinafter referred to as “OPC”) before recording a data signal. Generally, a write-once optical disc has a power calibration area (hereinafter referred to as “PCA”) for performing OPC. PCA consists of a test area and a count area. Each of the test area and the count area has a plurality of partitions, and one partition of the test area also has a plurality of frames.

  The conventional optical disk recording apparatus first records a predetermined signal in a test area such as PCA during OPC. For example, a conventional optical disk recording apparatus forms pits using 15 levels of recording power between 15 frames in a test area. Then, the conventional optical disc recording apparatus reproduces the recorded portion, detects the recording power with the best recording characteristics, and acquires this as the target recording power learning value (target light intensity of the first laser beam).

  Further, the conventional optical disk recording apparatus performs a predetermined test recording based on the target recording power learning value, measures a reflected light amount ratio (hereinafter referred to as “B / A value”) between the mark leading end and the mark trailing end, and The B / A value is acquired as the target B / A learning value (target reflected light amount ratio).

  A conventional optical disk recording apparatus performs dynamic laser control (hereinafter referred to as “APC”) and running OPC (hereinafter referred to as “ROPC”) during actual data recording. APC is a process for controlling the recording power so that a power monitor signal (a signal for observing the light intensity of the first laser beam) output from the laser pickup follows a predetermined target recording power. This is a process for dealing with comparatively loose fluctuations due to the characteristics and environmental temperature.

  On the other hand, ROPC compares a target B / A learning value with a B / A measurement value during data recording (a ratio of reflected light amount measured during data recording), and corrects the target recording power as needed based on the comparison result. It is processing. That is, in general, since a change in recording characteristics can be detected by monitoring a B / A measurement value during data recording, a conventional optical disk recording apparatus detects a change in recording characteristics by ROPC and sets a target recording power. Correction was made to stabilize the recording characteristics.

  A mark having a time width of 9T to 11T is used as a mark (pit) for detecting the B / A value. The ratio of the reflected light amount (B level value) at the rear end of the mark to the reflected light amount (A level value) at the front end of the mark is the B / A value.

  FIG. 10 shows an example of calculating the B / A value. FIG. 10A shows the signal waveform after the EFM modulation described above. FIG. 10B shows the light intensity (laser power) of the laser light output from the semiconductor laser diode.

  In FIG. 10B, “Pw” is a laser power value at the time of mark (pit) formation and corresponds to a recording power value. “Pb” is a laser power value when a mark (pit) is not formed (that is, when a space is formed), and corresponds to a reproduction power value.

  FIG. 10C shows marks and spaces formed on the optical disk. When the laser beam shown in FIG. 10B is irradiated, a 3T mark and a 9T mark are formed as shown in FIG.

  FIG. 10D shows a signal waveform obtained by converting the reflected light from the optical disk into an electrical signal. The amplitude value of this signal waveform corresponds to the amount of light reflected from the optical disk. FIG. 10E shows a signal waveform obtained by passing the electric signal through a low-pass filter. In FIG. 10 (e), Va at the L1 location is the signal level obtained from the reflected light amount of the second laser light, and Vb at the L2 location is obtained from the reflected light amount of the pulsed first laser light (multi-pulse part). Indicates the signal level.

In the conventional optical disc recording apparatus, when calculating the B / A value, the reflected light amounts A and B are calculated from the waveform shown in FIG.
A = (Pw / Pb) × Va
B = (Vb−Va) / Tmp + Va
Here, Tmp is the duty ratio of one cycle portion of the multi-pulse part shown in FIG.

  As described above, the conventional optical disk recording apparatus calculates the target B / A learning value and the B / A measurement value during data recording from the reflected light amounts (Va, Vb) of the first laser beam and the second laser beam. Then, both are compared, and the target recording power is corrected as needed so that the B / A measurement value during data recording becomes the target B / A learning value.

  On the other hand, as another method for detecting the recording characteristic, there is a method for observing asymmetry. FIG. 11 shows a superposition of reproduction waveforms of optical discs on which random data is recorded with a constant recording power value and reproduction power value. The recording pattern on the optical disc is composed of a recording length mark of 3T to 11T and an unrecorded length space on a unit time T basis. The operator obtains the amplitude values AH1, AH2, AL1, and AL2 of the longest space, the shortest space, the longest mark, and the shortest mark from the reproduced waveform, and calculates an asymmetry value ASYM (%) using the following equation. .

ASYM = (((((AH2 + AL2) / 2)-((AH1 + AL1) / 2)) / (AH1-AL1))) × 100
When the recording characteristics are good, the eye pattern of the reproduced waveform shown in FIG. 11 is clearly opened. Therefore, the reproduction waveform of an optical disc on which random data is recorded with the recording power with the best recording characteristics obtained at the OPC and without any disturbance has a clear eye pattern. In other words, if the asymmetry value at this time is the target asymmetry value, the asymmetry value calculated from the reproduction waveform of the optical disc recorded with the recording power controlled by the APC and the ROPC follows the target asymmetry value. .

Next, a conventional optical disk recording apparatus will be described in detail with reference to the drawings. FIG. 12 is a schematic block diagram relating to a recording power control portion and a mechanical control portion of a conventional optical disc recording apparatus.
In FIG. 12, the recording power control apparatus 100 performs the APC and ROPC to control the light intensity (recording power) of the first laser beam.

  In the recording power control apparatus 100, the semiconductor laser diode (laser irradiation means) 101 irradiates the optical disk with laser light. The optical disc has a test area such as PCA and a data area such as a user data area. The monitoring photodiode 102 is for observing the light intensity of the first laser light, receives the first laser light immediately after the output from the semiconductor laser diode 101, and receives an electric signal (power) corresponding to the light intensity. Monitor signal).

The servo / RF photodiode 103 receives the reflected light from the optical disk and outputs an electrical signal corresponding to the reflected light quantity.
The B / A value detector 104 measures the B / A value based on the electrical signal from the servo / RF photodiode 103. Further, the B / A value detection unit 104 generates a total reflected light amount signal (AS signal) based on the electrical signal.

The ROPC unit 106 is for performing the above-described ROPC, and sets the gain of the APC unit described later based on the B / A measurement value from the B / A value detection unit 104.
APC (A utomatic P ower C ontrol ) unit 107 is used to perform the APC, based on the outputs of the ROPC unit 106 of the monitor photodiode 102, a first laser in which a semiconductor laser diode 101 is irradiated Control light intensity.

  In FIG. 12, the servo error detection unit 105 is based on the electrical signal from the servo / RF photodiode 103, and includes a tracking error signal (TE signal) and a focus error signal (FE) that are observation signals for mechanical control. Signal). The servo control unit 108 performs laser pickup tracking, focus control, and disk rotation control based on the TE signal, the FE signal, and the AS signal. A mechanical unit 109 is a mechanical unit controlled by the servo control unit 108.

  Hereinafter, an operation at the time of data recording of the optical disc recording apparatus will be described. At the start of data recording, first, the semiconductor laser diode 101 irradiates the optical disc with a first laser beam having a light intensity corresponding to the target recording power learning value obtained by OPC to form pits. The monitoring photodiode 102 receives the first laser beam, converts the light intensity into an electric signal, and outputs the electric signal to the APC unit 107. The APC unit 107 receives the output and controls the light intensity of the first laser light output from the semiconductor laser diode 101 to be constant at the light intensity corresponding to the target recording power learning value.

  The servo / RF photodiode 103 receives the reflected light from the optical disc, converts the reflected light amount into an electrical signal, and outputs the electrical signal. The B / A value detection unit 104 receives the output and calculates a B / A measurement value from the waveform of the electrical signal.

  When a disturbance occurs during data recording, the ROPC unit 106 adjusts the gain of the APC unit 106 based on the difference between the B / A measurement value and the target B / A learning value during data recording. Thereby, even if a disturbance occurs during data recording, the light intensity of the first laser light emitted from the semiconductor laser diode 101 is controlled so that the B / A measurement value becomes a predetermined target value.

  As described above, the recording power control apparatus 100 detects the light intensity (recording power) of the first laser light emitted from the semiconductor laser diode 101 from the reflected light of the optical disc during recording of the data signal. Control is performed so that the value always becomes the target B / A learning value.

  FIG. 13 is a block diagram illustrating the configuration of the ROPC unit 106 and the APC unit 107. In the ROPC unit 106, the B / A target value storage unit 21 holds a target B / A learning value obtained by OPC. The subtracter 22 subtracts the output (B / A measured value during data recording) of the B / A value detection unit 104 from the target B / A learning value held by the B / A target value storage unit 21. The ROPC loop filter 23 controls the output of the subtracter 22 with a predetermined frequency characteristic. The recording current correction unit 24 corrects the recording current (output of a WAPC loop filter described later) based on the output of the ROPC loop filter 23.

  In the APC unit 107, the recording power target value storage unit 31 holds a target recording power learning value obtained by OPC. The adder 32 adds the target recording power learning value held by the recording power target value storage unit 31 and the output (light intensity correction amount) of the ROPC loop filter 23 described above. The subtracter 33 subtracts the output of the adder 32 from the power monitor signal that is the output of the monitoring photodiode 102. A WAPC (Write APC) loop filter 34 controls the output of the subtractor 33 with a predetermined frequency characteristic.

  The adder 35 adds the output of the WAPC loop filter 34 and the output (recording current correction amount) of the recording current correction unit 24 described above. The adder 35 corrects the output of the WAPC loop filter 34 when the output of the subtracter 33 exceeds the control frequency band limit of the WAPC loop filter 34.

  The recording power limiter 36 sets an upper limit and a lower limit for the output of the adder 35 and outputs an upper limit value when exceeding the upper limit value, and outputs a lower limit value when falling below the lower limit value. The recording current is a set value of the recording power. The semiconductor laser diode 101 irradiates a first laser beam having a light intensity (laser power) based on this recording current, thereby forming pits on the optical disk.

  Next, operations of the ROPC unit 106 and the APC unit 107 will be described. In general, in the absence of disturbance (change in output (change in light intensity) due to temperature change of semiconductor laser diode, change in optical disk shape, change in recording sensitivity of disk recording layer, etc.), the measured B / A value and target B / Since there is no difference from the A learning value, the APC unit 107 calculates the laser power value (recording power value) of the first laser beam based on the difference between the power monitor signal and the target recording power learning value obtained by OPC. Set to semiconductor laser diode 101.

  When disturbance occurs, the recording characteristics change, and a difference occurs between the measured B / A value and the target B / A learning value during data recording. Therefore, the ROPC loop filter 23 reduces the recording power so as to eliminate the difference. A correction value (light intensity correction amount) is generated. As a result, when this correction value is input to the adder 32 and the output of the subtractor 33 exceeds the control frequency band limit of the WAPC loop filter 34, the output of the recording current correction unit 24 that has received this correction value. (Recording current correction amount) is input to the adder 35, and the recording characteristics are equivalent to those at the time of OPC.

  Next, the servo / RF photodiode 103, the B / A value detection unit 104, and the servo error detection unit 105 will be described with reference to FIG. The servo / RF photodiode 103 receives the reflected light from the optical disk and outputs an electrical signal corresponding to the light intensity. The B / A value detection unit 104 receives the electrical signal, calculates a B / A value, and generates an AS signal. The servo error detector 105 receives the electrical signal and generates TE and FE signals.

In FIG. 14, Tr indicates the track of the optical disc, and Mb, Sb1, and Sb2 indicate the main beam, sub beam 1, and sub beam 2 from the semiconductor laser diode 101.
In the servo / RF photodiode 103, the main beam photodiode 71 receives the reflected light generated by the main beam Mb and outputs four electric signals (A, B, C, D) corresponding to the light intensity. Output from the split photodiode.

  On the other hand, the sub-beam photodiodes 72 and 73 receive the reflected light generated by the sub-beams Sb1 and Sb2, respectively, and generate electric signals (E, F) and (G, H) corresponding to the light intensity from the two-divided photodiodes. Output each.

  In the servo error detection unit 105, the sample hold circuits 74a to 74d sample and hold the electric signals A, B, C, and D, respectively. The sample hold circuit 74e samples and holds the electric signal E and the electric signal G, and the sample hold circuit 74f samples and holds the electric signal F and the electric signal H.

  The TE operation unit 75 generates a TE signal based on the outputs of the sample hold circuits 74a to 74f, and the FE operation unit 76 generates an FE signal based on the outputs of the sample hold circuits 74a to 74d.

However, the signals sampled by the sample hold circuits 74a to 74f are electrical signals corresponding to the amount of reflected light of the second laser beam, and are signals at the L1 position in FIG.
In the B / A value detection unit 104, the adder 77 generates a sum signal of the electrical signals A, B, C, and D output from the main beam photodiode 71. The sample hold circuit 78 samples and holds this sum signal. However, the signal sampled and held by the sample hold circuit 78 is an electric signal corresponding to the amount of reflected light of the first and second laser beams, and is a signal at L1 and L2 in FIG. 5 (signal level Va, Vb).

  The B / A value calculation unit 79 calculates the A level value and the B level value based on the signal levels Va and Vb sampled and held by the sample and hold circuit 78 to obtain the B / A value.

Note that the signal output by the sample and hold circuit 78 after sampling and holding the electrical signal (signal level Va) corresponding to the reflected light amount of the second laser beam is also an AS signal.
Next, an operation example of the recording power control based on the B / A value of the ROPC unit 106 will be described with reference to FIG. The graph shown in FIG. 15 shows recording power and B / A value characteristics (recording power value vs. B / A value characteristic curve).

  When data recording is started in a data area such as a user data area, the conventional optical disc recording apparatus starts recording at a recording power corresponding to the target recording power learning value Pw0 obtained by OPC. Thereafter, the B / A value detection unit 104 sequentially measures the B / A measurement value during data recording, but the B / A measurement value deviates from the target B / A learning value when affected by disturbance.

  For example, assuming that the position P0 (B / A0) at the start of recording increases in the B / A measurement value due to the influence of the disturbance and becomes stable at “B / A0X”, the position is apparently “P0X”. It will shift to "".

  In this case, the conventional optical disk recording apparatus increases the recording power by ΔP0X in order to return “B / A0X” to the target “B / A0”. By controlling in this way, the recording power value after the control finally becomes “Pw0 + ΔP0X”.

  Similarly, if the B / A measurement value decreases due to disturbance during data recording and becomes stable at “B / A0Y”, the position is apparently shifted to “P0Y”. The apparatus decreases the recording power by ΔP0Y in order to return “B / A0Y” to the target “B / A0”. By controlling in this way, the recording power value after the control finally becomes “Pw0−ΔP0Y”.

  However, in the conventional optical disk recording apparatus, the recording power may be deteriorated due to adverse effects caused by various disturbances. In particular, when an error occurs between the amount of reflected light in the test area (the amount of reflected light at the time of forming a space, which corresponds to Va) and the amount of reflected light in the space in the data area, recording at the start of recording by controlling the ROPC unit Power gets worse.

This is the above formula A = (Pw / Pb) × Va
"Pw / Pb" is a very large value (varies depending on the media manufacturer), so the Va error is amplified, the A level value changes greatly, and finally the B / A value error increases. Due to

  For example, in FIG. 16, the target recording power learning value Pw0 and the target B / A learning value B / A0 obtained by OPC exist on the characteristic curve 501 of the recording power value versus B / A value at the time of OPC (position P0). ). However, when the recording of the data signal to the data area is started using the target recording power learning value Pw0, the amount of reflected space light changes and the characteristic of the recording power value versus the B / A value becomes the state of the characteristic curve 502. If so, the B / A measurement value becomes B / A1, which is smaller than the target B / A learning value B / A0. For this reason, the conventional optical disc recording apparatus tries to control the recording power so that the measured B / A value becomes B / A0 on the characteristic curve 501 (in other words, from the position P2 to the position P0). As a result, at the start of recording, the recording power suddenly decreases by “Pw2−Pw0” (deterioration of recording power).

  Therefore, when an error occurs between the space reflected light amount in the test area and the space reflected light amount in the data area due to disturbance, the asymmetry characteristic (recording characteristic) becomes an unexpected asymmetry characteristic 602 as shown in FIG. was there.

  In other words, the asymmetry characteristic 601 in the case where there is no error in the space reflected light amount at the time of B / A value learning and data recording is originally expected, whereas the original recording is affected by the error of the space reflected light amount due to the disturbance. A data signal is recorded with a recording power lower than the power, resulting in an asymmetry characteristic 602 that is not expected.

  In particular, when recording data at high and low temperatures, the error between the target B / A learning value obtained in the test area and the B / A measurement value immediately after the start of data recording in the data area becomes large. The recording power of will deteriorate. This is because the characteristics of the laser pickup due to the temperature state difference between the B / A value learning in the test area and the data recording in the data area, the difference in recording sensitivity of the recording layer due to the difference in the recording position on the optical disk, Disturbances such as differences in surface shape are influencing.

  Further, when data recording is performed in a high temperature / low temperature state, the output variation of the laser pickup at the start of laser irradiation and the error variation of the power monitor signal become larger than normal temperature. For this reason, the asymmetry value calculated from the reproduction waveform of the optical disk on which the data signal is recorded in the high temperature / low temperature state is, for example, waved like the waveform 207 shown in FIG. 2, and from the target asymmetry value (“5%” in FIG. 2). There was a problem that the recording characteristics deteriorated greatly.

  In addition, a higher recording power is required for high-speed recording than for low-speed recording. However, in high-speed recording, the characteristics of recording power value versus B / A value differ as the recording power increases. That is, as shown in FIG. 4, as the recording power increases, the characteristic curve rises to the right.

Conventionally, ROPC is performed based on the slope of the tangent line of the characteristic curve on the assumption that the characteristic curve is downwardly sloping. For this reason, if high-speed recording is performed as it is, there is a problem that the ROPC unit performs erroneous control in a high recording power region where the characteristic curve rises.
JP 2000-222730 A (page 4-7, FIG. 4)

  In view of the above problems, the present invention obtains the first reproduction reflected light amount from the test area during OPC (learning), and obtains the second reproduction reflected light amount from the data area immediately before the start of data recording. The target B / A learning value (target reflected light amount ratio) is corrected based on the second reproduction reflected light amount, and the recording power control is performed based on the corrected target B / A value learned value (update target reflected light amount ratio). Accordingly, an object of the present invention is to provide an optical disc recording apparatus in which recording characteristics are stable even when disturbance occurs.

  In addition, the present invention detects the temperature inside the apparatus, and controls the upper and lower limit values of the recording power according to the detected temperature value, so that even when disturbances occur during data recording at high and low temperatures. An object of the present invention is to provide an optical disc recording apparatus having stable recording characteristics.

  Further, the present invention obtains a recording power boundary value at which the characteristic curve (see FIG. 4) of the recording power value versus the B / A value rises to the right, and when the recording power exceeds this recording power boundary value. An object of the present invention is to provide an optical disc recording apparatus in which the recording characteristics in high-speed recording are stabilized by stopping the function of the ROPC section and switching to temperature control.

  Also, the present invention provides an optimum recording speed based on the difference between the recording power boundary value at which the characteristic curve of the recording power value versus the B / A value rises to the right and the target recording power learning value, and an external recording speed command. It is an object of the present invention to provide an optical disk recording apparatus in which recording characteristics are stable even when high-speed recording is commanded by recording a data signal at the determined recording speed.

  An optical disk recording apparatus according to claim 1 of the present invention comprises a laser beam irradiation means for irradiating a first laser beam having a light intensity for forming pits and a second laser beam having a light intensity for not forming pits. Before performing data recording on the data area with respect to an optical disc having a test area and a data area irradiated with the first and second laser beams, the target light intensity of the first laser beam is measured in the test area. And the target reflected light amount ratio of the reflected light amount ratio measured from the reflected light amounts of the first and second laser lights, and the reflected light amount ratio measured during data recording in the data area is observed. An optical disc recording apparatus for controlling the first laser beam during data recording based on the light intensity of the first laser beam and the learned target reflected light amount ratio and the target light intensity. Sometimes Irradiate the second laser light to the strike area to obtain a first reproduction reflected light amount, and obtain the second reproduction reflected light amount by irradiating the second laser light to the data region immediately before starting data recording. A target reflected light amount ratio correcting unit configured to generate an updated target reflected light amount ratio by correcting the learned target reflected light amount ratio based on the first and second reproduction reflected light amounts; Holds the updated target reflected light amount ratio, and based on the held updated target reflected light amount ratio and the reflected light amount ratio measured during data recording, the light intensity of the first laser light during data recording Target light intensity correction means for generating a correction amount, holding the learned target light intensity, correcting the held target light intensity based on the light intensity correction amount, and correcting the corrected target light intensity and The first observed during data recording; A light that generates a recording current based on the light intensity of the laser beam, outputs the recording current to the laser light irradiation means, and converges the light intensity of the first laser light during data recording to the corrected target light intensity Strength stabilizing means.

  The optical disk recording apparatus according to claim 2 of the present invention is the optical disk recording apparatus according to claim 1, wherein the target light intensity correction means sets the light intensity correction amount in addition to the light intensity correction amount. A recording current correction amount is generated based on the recording current, and the light intensity stabilizing unit corrects the recording current based on the recording current correction amount and outputs the correction to the laser beam irradiation unit.

  An optical disk recording apparatus according to a third aspect of the present invention is the optical disk recording apparatus according to the first or second aspect, wherein the target reflected light amount ratio correcting means is the learned target reflected light amount ratio. On the other hand, the update target reflected light amount ratio is generated by multiplying the ratio of the first reproduced reflected light amount and the second reproduced reflected light amount.

  Further, an optical disk recording apparatus according to claim 4 of the present invention is the optical disk recording apparatus according to any one of claims 1 to 3, wherein, when additional recording is performed after data recording, prior to the additional recording operation, A new second reproduction reflected light amount is obtained in a region to be additionally recorded on the optical disc, and the target reflected light amount ratio learned by the target reflected light amount ratio correcting means is obtained with the new second reproduced reflected light amount. Correction is performed.

  The optical disk recording apparatus according to claim 5 of the present invention includes a laser beam irradiation means for irradiating a first laser beam having a light intensity that forms pits and a second laser beam having a light intensity that does not form pits, Before performing data recording on the data area with respect to the optical disk having the test area and the data area irradiated with the first and second laser lights, the target light of the first laser light in the test area The first laser light during data recording is learned based on the light intensity of the first laser light observed during data recording in the data area and the learned target light intensity. An optical disc recording device for controlling, wherein the learned target light intensity is retained, and a recording current is based on the retained target light intensity and the light intensity of the first laser light observed during data recording Before generating A light intensity stabilizing means for outputting the laser light irradiation means to converge the light intensity of the first laser light during data recording to the held target light intensity, and a temperature for detecting the internal temperature of the optical disk recording apparatus An upper limit and a lower limit of the light intensity of the first laser light during data recording are determined according to a temperature value detected by the sensor means and the temperature sensor means, and the recording current generated by the light intensity stabilizing means is determined. Variable recording power limiter means for controlling.

  Further, the optical disk recording apparatus according to claim 6 of the present invention comprises a laser beam irradiation means for irradiating a first laser beam having a light intensity that forms pits and a second laser beam having a light intensity that does not form pits, Before performing data recording on the data area with respect to the optical disk having the test area and the data area irradiated with the first and second laser beams, the target of the first laser beam in the test area is recorded. Learning the light intensity and the target reflected light amount ratio of the reflected light amount ratio measured from each reflected light amount of the first and second laser beams, and the reflected light amount ratio measured during data recording in the data area An optical disk recording apparatus for controlling the first laser light during data recording based on the observed light intensity of the first laser light and the learned target reflected light intensity ratio and the target light intensity, Learned The target reflected light amount ratio is retained, and the light intensity correction amount of the first laser light during data recording is determined based on the retained target reflected light amount ratio and the reflected light amount ratio measured during data recording. The target light intensity correction means to be generated, the learned target light intensity are held, the held target light intensity is corrected based on the light intensity correction amount, and the corrected target light intensity and data are being recorded. A recording current is generated on the basis of the light intensity of the first laser beam observed in step S3 and output to the laser beam irradiation means, and the light intensity of the first laser beam during data recording is corrected. Light intensity stabilizing means for converging to the target light intensity, temperature sensor means for detecting the internal temperature of the optical disk recording device, and the first laser light during data recording according to the detected temperature value of the temperature sensor means Determine upper and lower limits of light intensity And, characterized in that it comprises a variable recording power limiter unit for controlling the recording current generated by the light intensity stabilization unit.

  The optical disk recording apparatus according to claim 7 of the present invention is the optical disk recording apparatus according to claim 6, wherein, during the learning, the second laser beam is irradiated to the test area to perform first reproduction reflection. A light amount is obtained, and the second laser beam is irradiated to the data area immediately before starting data recording to obtain a second reproduction reflected light amount. Based on the first and second reproduction reflected light amounts, A target reflected light amount ratio correcting unit that corrects the learned target reflected light amount ratio to generate an updated target reflected light amount ratio, and the target light intensity correcting unit holds the updated target reflected light amount ratio during data recording. Then, the light intensity correction amount is generated based on the held update target reflected light amount ratio and the reflected light amount ratio measured during data recording.

  The optical disk recording apparatus according to claim 8 of the present invention is the optical disk recording apparatus according to any of claims 6 or 7, wherein the target light intensity correction means includes, in addition to the light intensity correction amount, A recording current correction amount is generated based on the light intensity correction amount, and the light intensity stabilizing unit corrects the recording current based on the recording current correction amount and outputs the correction to the laser beam irradiation unit. And

  An optical disk recording apparatus according to claim 9 of the present invention is the optical disk recording apparatus according to any one of claims 5 to 8, wherein the variable recording power limiter means is configured to perform the predetermined temperature range for each media manufacturer. The upper and lower limits of the light intensity of the first laser light are determined.

  The optical disk recording apparatus according to claim 10 of the present invention includes a laser beam irradiation means for irradiating a first laser beam having a light intensity that forms pits and a second laser beam having a light intensity that does not form pits, Before performing data recording on the data area with respect to the optical disk having the test area and the data area irradiated with the first and second laser beams, the target of the first laser beam in the test area is recorded. Learning the light intensity and the target reflected light amount ratio of the reflected light amount ratio measured from each reflected light amount of the first and second laser beams, and the reflected light amount ratio measured during data recording in the data area An optical disk recording apparatus for controlling the first laser light during data recording based on the observed light intensity of the first laser light and the learned target reflected light intensity ratio and the target light intensity, During the learning In the test area, the light intensity of the first laser light is changed stepwise to form a predetermined pit, and the reflected light amount ratio is measured for each light intensity. The target reflected light amount ratio is retained, and the light intensity correction amount of the first laser light during data recording is determined based on the retained target reflected light amount ratio and the reflected light amount ratio measured during data recording. The target light intensity correction means to be generated, the learned target light intensity are held, the held target light intensity is corrected based on the light intensity correction amount, and the corrected target light intensity and data are being recorded. A recording current is generated on the basis of the light intensity of the first laser beam observed in step S3 and output to the laser beam irradiation means, and the light intensity of the first laser beam during data recording is corrected. Stabilize the light intensity to converge to the target light intensity Temperature sensor means for detecting the internal temperature of the optical disk recording device, temperature variable target light intensity generating means for generating an updated target light intensity according to the detected temperature value of the temperature sensor means, and measured during the learning Based on the reflected light amount ratio for each light intensity changed stepwise and the learned target light intensity, the characteristics of the light intensity of the first laser beam and the reflected light amount ratio in the data region are expressed as follows. A recording power boundary value divided into two regions is obtained, the light intensity of the first laser beam observed during data recording is compared with the recording power boundary value, and the first power observed during data recording is compared. When the light intensity of the laser beam is less than the recording power boundary value or less than the recording power boundary value, the light intensity correction amount is input to the light intensity stabilizing means, and the light intensity correction amount is greater than or equal to the recording power boundary value. A reflected light amount ratio variation inspection unit that stops the input of the light intensity correction amount to the light intensity stabilization unit when it is detected that the recording power boundary value is exceeded, by the reflected light amount ratio variation inspection unit When the detection is made, the light intensity stabilizing unit generates the recording current based on the updated target light intensity generated by the temperature variable target light intensity generating unit instead of the learned target light intensity. It is characterized by that.

  The optical disk recording apparatus according to claim 11 of the present invention is the optical disk recording apparatus according to claim 10, wherein the reflected light amount ratio variation inspection means changes each of the stepwise changes measured during the learning. Based on the reflected light amount ratio for each light intensity, the inclination of the reflected light amount ratio with respect to each of the stepwise changed light intensities is calculated, and the inclination in the vicinity of the learned target light intensity is calculated from the calculated inclination group. Obtaining a difference value between the inclination corresponding to a light intensity equal to or greater than the learned target light intensity and the inclination in the vicinity of the target light intensity. Each absolute value of the difference value group is sequentially compared with a predetermined threshold value, and the light intensity from which the inclination corresponding to the difference value first determined to be larger than the predetermined threshold value is calculated is calculated. The recording power boundary value Characterized by and stored.

  An optical disk recording apparatus according to claim 12 of the present invention is the optical disk recording apparatus according to claim 10 or 11, wherein the temperature variable target light intensity generation means is the reflected light quantity ratio variation inspection means. The detected temperature value output from the temperature sensor means and the observed light intensity of the first laser light at the time when the detection by the above is performed, and the stored light intensity as the updated target light intensity The light intensity stabilizing means stores the light intensity of the first laser beam observed during the data recording after the time point when the detection is made, and becomes less than the recording power boundary value or below the recording power boundary value. Every time the difference in increase / decrease between the stored detected temperature value and the detected temperature value output from the temperature sensor means reaches a predetermined value, the stored light intensity is a predetermined correction amount. The light intensity after the increase / decrease and the detected temperature value output from the temperature sensor means at that time are stored again, and the light intensity after the increase / decrease is stored as the updated target light intensity in the light intensity stabilizing means. It is characterized by that.

  An optical disk recording apparatus according to a thirteenth aspect of the present invention is the optical disk recording apparatus according to any one of the tenth to twelfth aspects, wherein the second laser beam is irradiated to the test area during the learning. The first reproduction reflected light amount is obtained, and the second laser beam is irradiated to the data area immediately before the start of data recording to obtain the second reproduction reflected light amount. Based on the reproduction reflected light quantity ratio, it comprises target reflected light quantity ratio correcting means for correcting the learned target reflected light quantity ratio to generate an updated target reflected light quantity ratio, and the target light intensity correcting means is configured to record the data during data recording. An updated target reflected light amount ratio is retained, and the light intensity correction amount is generated based on the retained updated target reflected light amount ratio and the reflected light amount ratio measured during data recording.

  An optical disk recording apparatus according to claim 14 of the present invention is the optical disk recording apparatus according to any one of claims 10 to 13, wherein the target light intensity correction means includes, in addition to the light intensity correction amount, A recording current correction amount is generated based on the light intensity correction amount, and the light intensity stabilization unit corrects the recording current based on the recording current correction amount and outputs the correction to the laser light irradiation unit, and the reflection When the light intensity of the first laser beam observed during data recording is less than the recording power boundary value or less than or equal to the recording power boundary value, the light intensity ratio variation inspection unit sends the light intensity to the light intensity stabilizing unit. When the correction amount and the recording current correction amount are input and it is detected that the recording power boundary value is greater than or equal to the recording power boundary value, the light intensity correction amount to the light intensity stabilizing unit and the previous And wherein the stopping the input of the recording current correction amount.

An optical disk recording apparatus according to claim 15 of the present invention is the optical disk recording apparatus according to any one of claims 10 to 13, wherein the learned target light intensity and the temperature variable target light intensity generating means are used. A first selector means for selecting the updated target light intensity to be generated and outputting it to the light intensity stabilizing means; and a light intensity correction amount and a zero value generated by the target light intensity correction means. Second selector means for outputting to the light intensity stabilizing means;
And when the light intensity of the first laser beam observed during data recording is detected to be greater than or equal to the recording power boundary value or exceeding the recording power boundary value, the reflected light amount ratio variation inspection means generates a flag signal When the flag signal is turned on, the first selector means selects the update target light intensity, and the second selector means selects a zero value when the flag signal is turned on.

  An optical disk recording apparatus according to a sixteenth aspect of the present invention is the optical disk recording apparatus according to the fourteenth aspect, wherein the updated target generated by the learned target light intensity and the temperature variable target light intensity generating means. A first selector that selects light intensity and outputs the light intensity to the light intensity stabilizing unit; and the light intensity stabilizing unit that selects the light intensity correction amount and a zero value generated by the target light intensity correcting unit. And a third selector means for selecting the recording current correction amount and zero value generated by the target light intensity correction means and outputting them to the light intensity stabilization means. When the light intensity of the first laser beam observed during data recording is detected to be greater than or equal to the recording power boundary value or exceeding the recording power boundary value, the reflected light amount ratio variation inspection means When the flag signal is turned on, the first selector means selects the update target light intensity when the flag signal is turned on, and the second and third selector means select a zero value when the flag signal is turned on. It is characterized by.

  An optical disk recording apparatus according to claim 17 of the present invention is the optical disk recording apparatus according to claim 10 or 16, wherein the recording power boundary value is provided with a hysteresis characteristic, and the reflected light amount ratio fluctuation The inspection means performs the comparison using the recording power boundary value when the light intensity of the first laser beam observed during data recording is less than the recording power boundary value or less than the recording power boundary value, The comparison is performed using a recording power value obtained by reducing the recording power boundary value by a predetermined amount when the recording power boundary value is greater than or equal to the recording power boundary value.

  The optical disk recording apparatus according to claim 18 of the present invention comprises a laser beam irradiation means for irradiating a first laser beam having a light intensity that forms pits and a second laser beam having a light intensity that does not form pits, Before performing data recording on the data area with respect to the optical disk having the test area and the data area irradiated with the first and second laser beams, the target of the first laser beam in the test area is recorded. Learning the light intensity and the target reflected light amount ratio of the reflected light amount ratio measured from each reflected light amount of the first and second laser beams, and the reflected light amount ratio measured during data recording in the data area An optical disk recording apparatus for controlling the first laser light during data recording based on the observed light intensity of the first laser light and the learned target reflected light intensity ratio and the target light intensity, During the learning In the test area, the light intensity of the first laser light is changed stepwise to form a predetermined pit, and the reflected light amount ratio is measured for each light intensity. The target reflected light amount ratio is retained, and the light intensity correction amount of the first laser light during data recording is determined based on the retained target reflected light amount ratio and the reflected light amount ratio measured during data recording. The target light intensity correction means to be generated, the learned target light intensity are held, the held target light intensity is corrected based on the light intensity correction amount, and the corrected target light intensity and data are being recorded. A recording current is generated on the basis of the light intensity of the first laser beam observed in step S3 and output to the laser beam irradiation means, and the light intensity of the first laser beam during data recording is corrected. Stabilize the light intensity to converge to the target light intensity And the light intensity of the first laser light in the data region based on the ratio of the reflected light amount for each of the light intensity changed stepwise measured at the learning time and the learned target light intensity A reflected light quantity ratio variation inspection means for obtaining a recording power boundary value that divides the characteristic of the reflected light quantity ratio into two regions, and further calculating a difference amount between the obtained recording power boundary value and the learned target light intensity; Recording speed determination means for determining an optical disk rotation speed based on the difference amount and an optical disk rotation speed designated from the outside, and the data area at the optical disk rotation speed determined by the recording speed determination means It is characterized in that data recording is performed.

  Further, the optical disk recording apparatus according to claim 19 of the present invention is the optical disk recording apparatus according to claim 18, wherein the reflected light amount ratio variation inspection means changes each of the stepwise changes measured during the learning. Based on the reflected light amount ratio for each light intensity, the inclination of the reflected light amount ratio with respect to each of the stepwise changed light intensities is calculated, and the inclination in the vicinity of the learned target light intensity is calculated from the calculated inclination group. Obtaining a difference value between the inclination corresponding to a light intensity equal to or greater than the learned target light intensity and the inclination in the vicinity of the target light intensity. Each absolute value of the difference value group is sequentially compared with a predetermined threshold value, and the light intensity from which the inclination corresponding to the difference value first determined to be larger than the predetermined threshold value is calculated is calculated. The recording power boundary value Characterized in that it.

  An optical disk recording apparatus according to claim 20 of the present invention is the optical disk recording apparatus according to claim 18 or 19, wherein the recording speed determining means is designated from the difference amount and the outside. Table information for determining the final recording speed from the recording speed is held, and data recording in the data area is performed at the recording speed determined by the recording speed determining means.

  The optical disk recording apparatus according to claim 21 of the present invention is the optical disk recording apparatus according to claim 20, wherein the recording speed determining means holds the table information for each media manufacturer in advance, The recording speed is determined for each manufacturer.

  Further, an optical disk recording apparatus according to claim 22 of the present invention is the optical disk recording apparatus according to claim 20 or 21, wherein the recording speed determining means determines the recording speed based on the table information. If the recording speed cannot be determined, the fact that the recording is impossible is taught to the outside.

  An optical disk recording apparatus according to claim 23 of the present invention is the optical disk recording apparatus according to any one of claims 18 to 22, wherein the second laser beam is applied to the test area during the learning. The first reproduction reflected light amount is obtained, and the second laser beam is irradiated to the data area immediately before the start of data recording to obtain the second reproduction reflected light amount. A target reflected light amount ratio correcting unit that corrects the learned target reflected light amount ratio to generate an updated target reflected light amount ratio based on the reproduced reflected light amount, and the target light intensity correcting unit updates the update during data recording. A target reflected light amount ratio is held, and the light intensity correction amount is generated based on the held updated target reflected light amount ratio and the reflected light amount ratio measured during data recording.

  According to the present invention, in data recording at a high temperature, a low temperature, and a high speed, stable recording characteristics even if there are disturbance fluctuations such as a temperature change of the laser pickup output, a change in the shape of the optical disc, and a change in the recording sensitivity of the disc recording layer. It is possible to realize a recording power control capable of obtaining the above. Therefore, a data signal can be stably recorded at a high speed and a high density on an optical disk that can be additionally written and rewritten.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
As described above, the conventional optical disk recording apparatus performs the recording power control based on the target B / A learning value obtained by OPC (learning processing) in a test area such as PCA. On the other hand, the aim of the first embodiment is to update the target B / A learning value based on the difference between the reflected light amount from the test area and the reflected light amount from the data area such as the user data area. is there. That is, since the amount of reflected space light is equal to the amount of reflected reflected light obtained by irradiating the second laser beam, the optical disc recording apparatus according to the first embodiment irradiates the test region with the second laser beam during OPC, and data Immediately before the start of recording, the second laser beam is irradiated onto the data area, and the amount of reproduction reflected light is measured. Then, the optical disc recording apparatus corrects the target B / A learning value from the ratio of the two kinds of reproduction reflected light amounts, generates an updated target B / A learning value, and performs recording power control based on this.

  FIG. 1 is a block diagram of a recording power control portion of the optical disk recording apparatus according to the first embodiment. However, the same members as those described in FIG. 13 described above are denoted by the same reference numerals, and description thereof is omitted.

  In FIG. 1, the ROPC unit (target light intensity correction means) 20 has the same configuration as the ROPC unit 106 shown in FIG. That is, the ROPC unit 20 uses the target B / A value and the B / A measurement value (the reflected light amount ratio measured during data recording) held in the B / A target value storage unit 21 during data recording in the data area. The difference is taken to generate a recording power correction value (light intensity correction amount).

  The APC unit (light intensity stabilizing means) 30 has the same configuration as the APC unit 107 shown in FIG. That is, the APC unit 30 holds the target recording power learning value (target light intensity of the first laser beam) obtained by OPC in the recording power target value storage unit 31. Then, the APC unit 30 corrects the target recording power learning value (gain adjustment) based on the correction value of the recording power input from the ROPC unit 20 during data recording in the data area, and the power monitor signal (during data recording) The difference between the light intensity of the first laser beam observed in (1) and the corrected target recording power learning value is taken, and the recording power (the light intensity of the first laser beam) is controlled based on the difference, and the recording is performed. The power is converged to the corrected target recording power learning value.

  In the optical disk recording apparatus according to the first embodiment, in addition to the configurations of the APC unit 30 and the ROPC unit 20, a B / A target value correcting unit (target reflected light amount ratio correcting unit) 10 and a selector 11 are added. .

  The B / A target value correction unit 10 reproduces the reproduction reflected light amount (first reproduction reflected light amount) X obtained by irradiating the test area with the second laser beam during OPC, and the second data area immediately before the start of data recording. The reproduction reflected light amount (second reproduction reflected light amount) Y obtained by irradiating the laser beam and the target B / A learning value (hereinafter referred to as initial target B / A learning value) obtained during OPC are stored. Based on the reproduction reflected light amounts X and Y, the initial target B / A learning value (target reflected light amount ratio) is corrected to generate an updated target B / A learning value (updated target reflected light amount ratio). The reproduction reflected light amounts X and Y can be obtained from the AS signal output from the sample hold circuit 78 shown in FIG. Further, as the time width of the mark (pit) used for detecting the B / A value, the time width capable of obtaining “Vb” at the L2 location shown in FIG. 10 is used.

  The selector 11 selects an initial target B / A learning value during OPC, and selects an updated target B / A learning value that is an output of the B / A target value correction unit 10 during data recording. The selected value is stored in the B / A target value storage unit 21.

For example, a CPU or the like may be used as the B / A value calculation unit 79 shown in FIG.
Next, the operation of the optical disc recording apparatus will be described. The optical disc recording apparatus first performs OPC in the test area prior to data recording in the data area to obtain a target recording power learning value and an initial target B / A learning value. The target recording power learning value is stored in the recording power target value storage unit 31. At the same time, the initial target B / A learning value is stored in the B / A target value storage unit 21 via the selector 11. The initial target B / A learning value is also stored in the B / A target value correction unit 10. At this time, the OPC period signal to the selector 11 is ON.

Further, the optical disc recording apparatus irradiates the test area with the second laser beam during OPC, acquires the reproduction reflected light amount X (AS value), and stores it in the B / A target value correction unit 10.
Next, the optical disc recording apparatus turns off the OPC period signal to the selector 11 immediately before the start of data recording in the data area, and then irradiates the data area with the second laser beam to obtain the reproduction reflected light quantity Y. And stored in the B / A target value correction unit 10.

  The B / A target value correction unit 10 performs a predetermined calculation based on the reproduction reflected light amounts X and Y and the initial target B / A learning value, calculates an update target B / A learning value, and outputs the B / A target value via the selector 11. A is output to the target value storage unit 21. The updated target B / A learning value is stored in the B / A target value storage unit 21 in the form of being overwritten on the initial target B / A learning value. Subsequent recording power control is the same as in the prior art.

Next, a procedure for calculating the update target B / A learning value from the reproduction reflected light amounts X and Y and the initial target B / A learning value will be described. If the initial target B / A learning value at OPC is B1 / A1, A1 and B1 are
A1 = (Pw / Pb) · X
B1 = (Vb−X) / Tmp + X
It becomes. Here, “Pw” corresponds to a target recording power learning value. “Pb” corresponds to a reproduction power value. “Vb” corresponds to the potential level at the L2 position in FIG. Further, the reproduction reflected light amount X corresponds to the potential level Va at the L1 location in FIG.

On the other hand, since the reproduction reflected light amount when the second laser beam having the reproduction power value Pb is irradiated to the data area is Y, suppose that the B / A value learning process similar to OPC is performed in the data area. If the target B / A learning value is B2 / A2, A2 and B2 are
A2 = (Pw / Pb) · Y
B2 = (Vb−Y) / Tmp + Y
It becomes. Even if an error ΔZ occurs between the reproduction reflected light amount X and the reproduction reflected light amount Y, B1≈B2, but the error “(Pw / Pb) · ΔZ” between A1 and A2 is very large because “Pw / Pb”. , “(Pw / Pb) · ΔZ” becomes large, and the errors of “B1 / A1” and “B2 / A2” are dominated by the errors of A1 and A2.

Therefore, the update target B / A learning value to be finally obtained is
B2 / A2 ≒ B1 / A2
= (B1 / A1) ・ (A1 / A2)
= (B1 / A1) ・ (X / Y)
Thus, the initial target B / A learning value B1 / A1 is multiplied by the ratio of the reproduction reflected light amounts X and Y.

  In the first embodiment, correction / update processing of the initial target B / A learning value is performed prior to the first data recording after the OPC in the test area. Even when data is recorded in the form of being added to the first recording location after the end of recording (so-called additional recording operation), the initial target B / A learning value correction / update processing is performed prior to the additional recording operation. May be.

  That is, the B / A target value correction unit 10 holds the initial target B / A learning value and the reproduction reflected light amount ratio X, and the optical disc recording apparatus newly reproduces the reproduction reflected light amount in the data area to be additionally recorded prior to the additional recording operation. Y is acquired, and the B / A target value correction unit 10 performs correction / update processing using the new reproduction reflected light amount Y.

  As described above, according to the first embodiment, it is possible to avoid an unexpected asymmetry characteristic that is generated due to an error between the space reflected light amount from the test area and the space reflected light amount from the data area.

(Embodiment 2)
As described above, when data recording is performed in a high temperature / low temperature state, the output variation of the laser pickup at the start of laser irradiation and the error fluctuation of the power monitor signal become larger than normal temperature. Therefore, when data recording is performed in a high temperature / low temperature state, the asymmetry value largely fluctuates from the target asymmetry value, and the recording characteristics deteriorate.

  FIG. 2 shows an example of the asymmetry value for each radial position of the optical disk calculated from the reproduction waveform of the optical disk on which the data signal is recorded in the high temperature / low temperature state. As shown in FIG. 2, when data recording is performed in a high temperature / low temperature state, the asymmetry value undulates like a waveform 207, and the asymmetry value temporarily decreases / increases.

  Therefore, in the second embodiment, the temperature inside the apparatus is detected, and the upper limit value and the lower limit value of the recording power are appropriately set according to the detected temperature value so that the asymmetry value does not deviate significantly from the target asymmetry value. This prevents the recording characteristics from becoming unstable.

  FIG. 3 is a block diagram of a recording power control portion of the optical disk recording apparatus according to the second embodiment. However, the same members as those described in FIG. 13 are denoted by the same reference numerals, and description thereof is omitted.

  In FIG. 3, the ROPC unit 20 has the same configuration as the configuration of the ROPC unit 106 shown in FIG. Further, the APC unit 30 has substantially the same configuration as the APC unit 107 shown in FIG. 13 described above, but differs in that a variable recording power limiter (variable recording power limiter means) 41 is provided instead of the recording power limiter. In addition to the configuration of the APC unit 30 and the ROPC unit 20, a temperature sensor (temperature sensor means) 40 is added to the apparatus.

  The temperature sensor 40 detects the temperature value of the APC unit 30. However, the temperature sensor is not limited to the temperature of the APC unit, and may be configured to detect, for example, the temperature inside the drive or the internal temperature of the laser pickup. Hereinafter, the temperature value detected by the temperature sensor 40 will be described as “T”.

  The variable recording power limiter 41 controls the upper limit value and the lower limit value of the recording power corresponding to the temperature value detected by the temperature sensor 40. A controller (for example, a CPU) may monitor the detected temperature value during data recording and instruct the variable recording power limiter 41 to specify an upper limit value and a lower limit value of the recording power.

  For example, as shown in FIG. 2, when the target asymmetry value calculated from the reproduction waveform of the optical disk on which the data signal is recorded by the target recording power learning value obtained by OPC is “5%”, the variable recording power limiter 41 is The upper and lower limits of the recording power are controlled for each temperature range as follows.

  That is, in the case of 20 ° C ≦ T <30 ° C, the upper limit value of the recording power is the laser power value corresponding to the asymmetry value “12%” (201 shown in FIG. 2), and the lower limit value is the asymmetry value “−2%. ”(206 shown in FIG. 2).

  When 30 ° C ≦ T <40 ° C. or 10 ° C ≦ T <20 ° C., the upper limit value of the recording power is the laser power value corresponding to the asymmetry value “10%” (202 shown in FIG. 2). The lower limit value is a laser power value corresponding to the asymmetry value “0%” (205 shown in FIG. 2).

  In the case of 40 ° C ≦ T or T <10 ° C, the upper limit value of the recording power is the laser power value corresponding to the asymmetry value “8%” (203 shown in FIG. 2), and the lower limit value is the asymmetry value “ The laser power value is equivalent to 2% "(204 shown in FIG. 2).

  Each recording power value corresponding to each asymmetry value described above varies by 1% when the recording power value (so-called target recording power learning value) with respect to the target asymmetry value (here, 5%) is 10 mW. Assuming that the recording power value fluctuates by 0.1 mW each time, the recording power corresponding to the asymmetry value “12%”, “10%” “8%” “2%” “0%” “-2%” The values are “10.7 mW”, “10.5 mW”, “10.3 mW”, “9.7 mW”, “9.5 mW”, and “9.3 mW”, respectively.

  When the temperature environment is good, the output of the laser pickup is stable, and good recording characteristics can be obtained by controlling APC and ROPC. However, at high and low temperatures, the output is related to the temperature characteristics of the laser pickup output. Since the output reliability is lowered, the reliability of the recording characteristics obtained by the control of APC and ROPC is also lowered. In view of this, at high and low temperatures, the upper and lower limits of the asymmetry value are thus narrowed to prevent the deterioration of the recording characteristics obtained by the control of APC and ROPC.

  However, the amount of change in the recording power value corresponding to the change of 1% in the asymmetry value may vary depending on the media manufacturer. Therefore, a table in which the upper limit value and the lower limit value of the recording power for each temperature range for each media manufacturer are stored in advance in the variable recording power limiter 41, and the variable recording power limiter 41 is the medium of the optical disc to be recorded at present. The upper limit value and the lower limit value of the recording power may be determined based on the manufacturer information. In addition, the above table is held in advance in a controller (for example, CPU), the media manufacturer information of the optical disk to be recorded at present is input to the controller, and the controller monitors the detected temperature value during data recording. The upper and lower limits of the recording power may be instructed to the variable recording power limiter 41. Note that the media manufacturer information (manufacturer name) may be acquired, for example, by reading the media manufacturer information recorded in advance on the optical disc, or may be input by the user from an external input device. .

  Next, the operation of the optical disc recording apparatus will be described. The variable recording power limiter 41 always acquires the detected temperature value T from the temperature sensor 40 during data recording in the data area, and the detected temperature value T is recorded in accordance with the above-described determination conditions to determine the recording power during data recording. Determine the upper and lower limits.

  The variable recording power limiter 41 outputs a recording current corresponding to the upper limit value when the recording power value corresponding to the recording current output from the adder 35 in the APC unit 30 is larger than the upper limit value. The variable recording power limiter 41 outputs the recording current output from the adder 35 as it is when the recording power value corresponding to the recording current output from the adder 35 is not more than the upper limit value and not less than the lower decrease value. . The variable recording power limiter 41 outputs a recording current corresponding to the lower limit value when the recording power value corresponding to the recording current output from the adder 35 is smaller than the lower limit value.

  For example, when a data signal is recorded in a temperature state of 30 ° C ≦ T <40 ° C. or 10 ° C ≦ T <20 ° C., in the conventional optical disk recording apparatus, the asymmetry value is as shown by a waveform 207 shown in FIG. On the other hand, in the optical disc recording apparatus, the asymmetry value does not fall below “0%” as in the waveform 208, and does not deviate significantly from the target asymmetry value “5%”. .

  Although the conventional ROPC unit 106 is used as the ROPC unit 20 in the second embodiment, of course, the target B / A learning is performed by adding the B / A target value correcting unit 10 and the selector 11 as in the first embodiment. A function for correcting the value may be provided.

  As described above, according to the second embodiment, even when the ROPC unit is operating normally, when the error fluctuation of the power monitor signal input to the APC unit becomes larger than that at normal temperature depending on the temperature state, the asymmetry is performed. By preventing the value from significantly deviating from the target asymmetry value, the recording characteristics are prevented from becoming unstable.

(Embodiment 3)
As described above, higher recording power is required for high-speed recording than for low-speed recording. However, in high-speed recording, the characteristics of recording power value versus B / A value are low and high in recording power. Different.

  FIG. 4 is a diagram illustrating an example in which the characteristics of the recording power value versus the B / A value are different between a low recording power area and a high recording power area. As shown in FIG. 4, the characteristics of the recording power value versus the B / A value are divided into a downwardly rising area and an upwardly rising area in the low and high recording power areas.

  However, in the conventional optical disk recording apparatus, ROPC is performed on the assumption that the characteristic of the recording power value versus the B / A value is downward. For this reason, when trying to perform high-speed recording, the conventional optical disk recording apparatus has a problem that the ROPC unit performs erroneous control in a region where the characteristic of the recording power value versus the B / A value rises to the right.

  As will be described later, the optical disk recording apparatus according to the third embodiment obtains a recording power value corresponding to the boundary 401 shown in FIG. 4 and sets the characteristic of the recording power value versus the B / A value at the boundary 401 as B / A. The area is divided into a value controllable area 402 and a B / A value non-controllable area 403. When the recording power value during data recording is within the range of the B / A value uncontrollable area 403, the optical disc recording apparatus turns off the ROPC function and performs temperature control to be described later. Prevents erroneous control in the ROPC section.

  FIG. 5 shows a block diagram of a recording power control portion of the optical disk recording apparatus according to the third embodiment. However, the same members as those described in FIGS. 3 and 13 are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 5, the ROPC unit 20 and the APC unit 30 have the same configuration as the configuration of the APC unit 107 and the ROPC unit 106 shown in FIG.
The optical disk recording apparatus includes a temperature sensor (temperature sensor means) 40, a temperature variable recording power target value generation unit (temperature variable target light intensity generation means) 50, a selector in addition to the configurations of the ROPC unit 20 and the APC unit 30. (First selector means) 51, B / A value fluctuation inspection section (reflected light quantity ratio fluctuation inspection means) 52, selector (second selector means) 53, and selector (third selector means) 54 are added. .

  The temperature sensor 40 detects the temperature value of the APC unit 30 as in the second embodiment described above. However, the temperature sensor is not limited to the temperature of the APC unit, and may be configured to detect, for example, the temperature inside the drive or the internal temperature of the laser pickup.

  The B / A value variation inspection unit 52 is different in processing at the time of OPC and data recording. The optical disc recording apparatus performs predetermined pit formation using a plurality of recording powers that change in stages during OPC, determines a target recording power learning value, and sets a B / A value of a recording location by each recording power. Ask.

  The B / A value variation inspection unit 52 acquires the plurality of recording power values, each B / A value, and the target recording power learning value at the time of OPC, and the characteristic of the recording power value versus the B / A value is right shoulder. A rising area (B / A value non-controllable area 403 shown in FIG. 4) is detected, and the recording power value at the boundary 401 with the downward-sloping area (B / A value controllable area 402 shown in FIG. 4) is Store as a recording power boundary value.

  Further, the B / A value variation inspection unit 52 compares the input power monitor signal with the stored recording power boundary value when data is recorded in the data area, and the current recording power value is the B / A value shown in FIG. When it exists within the controllable area 402, the recording power boundary flag (flag signal) is turned OFF, and when it exists within the B / A value uncontrollable area 403, the recording power boundary flag is turned ON. Output.

  When the recording power boundary flag is turned ON, the temperature variable recording power target value generation unit 50 generates an updated target recording power value with reference to the output (detected temperature value) of the temperature sensor 40 and the power monitor signal.

  When the recording power boundary flag is turned ON, the selector 51 selects the update target recording power value (update target light intensity) generated by the temperature variable recording power target value generation unit 50 and transfers it to the recording power target value storage unit 31. . The recording power target value storage unit 31 stores the updated target recording power value for each temperature change in a form of overwriting the target recording power learning value or the updated target recording power value.

  The selector 53 selects the output of the ROPC loop filter 23 when the recording power boundary flag is OFF, and selects the zero value when the flag is ON. Similarly, the selector 54 selects the output of the recording current correction unit 24 when the recording power boundary flag is OFF, and selects the zero value when the flag is ON.

  Next, the operation of the optical disc recording apparatus will be described. In conventional OPC, a target recording power learning value is obtained by forming a predetermined pit for each recording power in 0.5 mW increments within a range of ± 5 mW centered on a predetermined recording power value and reproducing the recording location. Was.

  The optical disc recording apparatus measures the B / A value when the predetermined power is formed by changing the recording power stepwise during OPC, and inputs it to the B / A value fluctuation inspection unit 52. The B / A value variation inspection unit 52 acquires and stores a B / A value for each recording power value that changes in stages.

For example, when a predetermined pit is formed by increasing the recording power value by 0.5 mW in the range of 5 mW to 15 mW, the B / A value at 5 mW is D0, the B / A value at 5.5 mW is D1, ..., when the B / A value at 15 mW is D20, the B / A value fluctuation inspection unit 52 determines the slope of the recording power value versus the B / A value as
Inclination G0 = (D0−D1) /0.5
Inclination G1 = (D1-D2) /0.5
...
Inclination G19 = (D19−D20) /0.5
Is calculated. If the separately determined target recording power learning value is 10 mW, the B / A value fluctuation inspection unit 52
Inclination G9 = (D9−D10) /0.5
And slope G10 = (D10−D11) /0.5
Average slope GG = (G9 + G10) / 2
Is regarded as the gradient of the recording power value near the target recording power learning value versus the B / A value. And the B / A value fluctuation | variation test | inspection part 52 calculates the difference of average inclination GG and each inclination G11-G19 more than a target recording power learning value.

That is, the B / A value variation inspection unit 52
Difference ΔG11 = GG−G11
Difference ΔG12 = GG−G12
...
Difference ΔG19 = GG−G19
Then, each absolute value of the differences ΔG11 to ΔG19 is compared with a predetermined value (predetermined threshold value) F in order from ΔG11. The B / A value variation inspection unit 52 records the recording power value corresponding to the B / A value D15 that is the basis of the calculation of G15, assuming that the difference that first becomes larger than the predetermined value F is, for example, ΔG15. Store as power boundary value.

  Further, the B / A value variation inspection unit 52 compares the power monitor signal with the recording power boundary value (here, 12.5 mW) during data recording, and the recording power value during data recording is less than the recording power boundary value. Determines that ROPC (control by B / A value) is possible, and turns off the recording power boundary flag.

  Thus, the selector 51 selects the target recording power learning value and stores it in the recording power target value storage unit 31, the selector 53 selects the output (light intensity correction amount) of the ROPC loop filter 23, and the selector 54 records the recording current. The output (recording current correction amount) of the correction unit 24 is selected. That is, when the recording power value is less than the recording power boundary value, the optical disc recording apparatus performs recording power control by APC and ROPC as before.

  On the other hand, when the recording power value during data recording becomes equal to or higher than the recording power boundary value, the B / A value variation inspection unit 52 determines that ROPC is impossible and sets the recording power boundary flag to ON.

  Thereby, the selector 51 selects the output of the temperature variable recording power target value generation unit 50 and causes the recording power target value storage unit 31 to store the updated target recording power value for each temperature change. The selectors 53 and 54 select a zero value. That is, when the recording power value is equal to or higher than the recording power boundary value, the optical disc recording apparatus turns off the ROPC function and performs recording power control by temperature fluctuation.

  Next, the outline of the control operation will be described with reference to FIG. The graph shown in FIG. 4 is a graph showing the characteristics of the recording power value versus the B / A value, the horizontal axis shows the recording power value, and the vertical axis shows the B / A value. In FIG. 4, Pw0 is the target recording power learning value 10 mW, Pw1 is 12 mW, Pw2 is the recording power boundary value 12.5 mW, and Pw3 is 14.5 mW. Therefore, the B / A value variation inspection unit 52 regards the state where the recording power is less than Pw2 as the B / A value controllable area 402 and the state where the recording power is greater than Pw2 as the B / A control impossible area 403.

  Note that the recording power boundary flag may have a hysteresis characteristic. For example, when the recording power is Pw2 when the recording power boundary flag changes from OFF to ON, the recording power boundary flag may change from ON to OFF when the recording power becomes Pw2-ΔPh. . Here, ΔPh is a predetermined value (predetermined amount) prepared for providing hysteresis.

  Next, the recording power control operation due to temperature fluctuation in the B / A value uncontrollable area 403 will be described with reference to FIG. The temperature variable recording power target value generation unit 50 recognizes the temperature during data recording with reference to the output from the temperature sensor 40 (hereinafter referred to as T), and the recording power boundary flag changes from OFF to ON. At this time, the temperature Ti and the recording power value Po which is the output of the monitoring photodiode are stored, and this recording power value Po is input and stored in the recording power target value storage unit 31 as an updated target recording power value.

  Thereafter, each time the temperature variable recording power target value generation unit 50 reaches the predetermined temperature (ΔT = 5 ° C. in FIG. 6), the predetermined recording power correction amount (see FIG. 6). Is increased or decreased with respect to the recording power value Po, and “Po + ΔP” or “Po−ΔP” is input and stored in the recording power target value storage unit 31 as an updated target recording power value, and this updated target recording power value is also stored. A new “Po” is set, and “Ti + ΔT” or “Ti−ΔT” is set as a new “Ti”.

  The temperature variable recording power target value generation unit 50 repeats the above operation every time the detected temperature value T changes by ΔT. That is, when the above temperature determination becomes T−Ti> ΔT, the recording power value Po is updated to “Po + ΔP”, the temperature Ti is updated to “Ti + ΔT”, and the updated recording power value is recorded. This is sent to the power target value storage unit 31. When Ti−T> ΔT, the recording power value Po is updated to “Po−ΔP”, the temperature Ti is updated to “Ti−ΔT”, and the updated recording power value is recorded as the recording power. This is sent to the target value storage unit 31.

Thus, by updating the recording power in accordance with the temperature change, it is possible to prevent the deterioration of the recording characteristics due to the temperature characteristics of the laser pickup output and the temperature characteristics of the recording layer of the optical disk.
Thereafter, when the recording power boundary flag changes from ON to OFF, the selector 51 selects the target recording power learning value obtained by OPC, and the selectors 53 and 54 output the ROPC loop filter 23, and the recording current correction unit 24. Therefore, normal recording power control is performed.

  In the third embodiment, the conventional ROPC unit 106 and APC unit 107 are used as the ROPC unit 20 and the APC unit 30. Of course, the B / A target value correction unit 10 and the selector 11 are used as in the first embodiment. Or a variable recording power limiter 41 may be added as in the second embodiment.

  As described above, according to the third embodiment, it is possible to obtain stable recording characteristics even when the characteristics of the recording power value versus the B / A value are different between high-speed recording and low-speed recording. In addition, the recording power can be controlled.

(Embodiment 4)
As described above, a higher recording power is required for high-speed recording than for low-speed recording. However, if high-speed recording is performed, the recording power value vs. the B / A value in the low and high recording power areas. The characteristics are different. In the conventional optical disk recording apparatus, ROPC is performed on the assumption that the characteristic of the recording power value versus the B / A value is downwardly sloping. Therefore, when high-speed recording is performed, the recording power value versus the B / A There is a problem that the ROPC unit performs erroneous control in a region where the A value characteristic rises to the right. The purpose of the fourth embodiment is to prevent erroneous control by the ROPC section, as in the third embodiment.

  In the fourth embodiment, the recording power boundary value (Pw2 shown in FIG. 4) increases as the recording linear velocity decreases, and the recording linear velocity is intentionally decreased. We are trying to solve the problem.

  FIG. 7 shows a block diagram of a recording power control portion of the optical disk recording apparatus according to the fourth embodiment. However, the same members as those described in FIGS. 5 and 13 are denoted by the same reference numerals, and the description thereof is omitted.

In FIG. 7, the ROPC unit 20 and the APC unit 30 have the same configuration as the configuration of the APC unit 107 and the ROPC unit 106 shown in FIG.
In addition to the configurations of the ROPC unit 20 and the APC unit 30, the optical disc recording apparatus includes a B / A value variation inspection unit (reflected light quantity ratio variation inspection unit) 52 and a recording speed determination unit (recording speed determination unit) 60. Have been added.

  The B / A value fluctuation inspection unit 52 in the optical disc recording apparatus is similar to the B / A value fluctuation inspection unit in the third embodiment in that the recording power boundary value is calculated during OPC. The difference from the B / A value variation inspection unit in the third embodiment is that a power difference value, which is a difference amount between the value and the target recording power learning value, is calculated.

  Further, the B / A value variation inspection unit in the third embodiment generates a flag signal by referring to the power monitor signal at the time of data recording. However, the B / A value variation inspection unit 52 in the optical disc recording apparatus uses the data It does not operate during recording and therefore does not generate a flag signal.

  The recording speed determination unit 60 determines the final recording line based on the recording linear speed (recording speed) designated from the outside (for example, a host computer) and the power difference value output from the B / A value variation inspection unit 52. The speed is determined and the servo control unit is instructed (see the servo control unit 108 shown in FIG. 12).

  In the optical disc recording apparatus, the recording power boundary value is calculated at the recording linear velocity designated from the outside during OPC, and the recording speed determination unit 60 performs data recording based on the difference from the target recording power learning value obtained during the OPC. It is characterized in that the recording linear velocity at the time is determined.

  Hereinafter, the operation of the optical disc recording apparatus will be described. The operation of calculating the recording power boundary value by the B / A value fluctuation inspection unit 52 at the time of OPC is the same as that in the third embodiment. In the following description, it is assumed that the recording linear velocity designated externally is 6 ×, the recording power boundary value is “12.5 mW”, and the target recording power learning value obtained by OPC is “10 mW”.

  Before performing data recording in the data area, OPC is performed at a recording linear velocity of “6 ×”, a power difference value Ps between the recording power boundary value and the target recording power learning value is calculated, and transferred to the recording velocity determining unit 60. To do. Here, the power difference value Ps is “2.5 mW”.

  The recording speed determining unit 60 determines the final recording linear speed based on the recording linear speed designated from the outside (for example, a host computer) and the power difference value Ps, and instructs the servo control section. Specifically, the recording speed determining unit 60 holds a matrix table for determining a final recording linear speed according to the recording linear speed designated from the outside and the power difference value Ps. The final recording linear velocity is determined using a table.

  FIG. 8 shows an example of the matrix table. In the example shown in FIG. 8, the power difference value is divided every predetermined power amount ΔPs “1 mW”. For example, when 2 mW ≦ Ps <3 mW and the designated recording linear velocity is 6 × speed, 2 × speed is selected from this matrix table. Accordingly, the recording speed determination unit 60 instructs the servo control unit to set the final recording linear velocity to double speed.

Thereafter, OPC is performed again at double speed, and recording power control by ROPC and APC is performed as in the conventional case.
For example, when 1 mW ≦ Ps <2 mW and the designated recording linear velocity is double speed, recording is disabled in the matrix table shown in FIG. 8, but in this case, the recording line to the servo control unit is selected. It teaches that recording is impossible to the outside of the host computer or the like by stopping the rotation of the optical disk by specifying zero as the speed.

  Further, the characteristics of the recording power value versus the B / A value may be different for each media manufacturer. Therefore, the recording speed determination unit holds a matrix table for each media manufacturer, and the recording speed determination unit determines the final recording speed for each media manufacturer based on the media manufacturer information of the optical disk to be recorded at present. You may comprise so that it may do. Note that the media manufacturer information (manufacturer name) may be acquired, for example, by reading the media manufacturer information recorded in advance on the optical disc, or may be input by the user from an external input device. .

  In the fourth embodiment, the conventional ROPC unit 106 and APC unit 107 are used as the ROPC unit 20 and the APC unit 30. Of course, the B / A target value correction unit 10 and the selector 11 are used as in the first embodiment. Or a variable recording power limiter 41 may be added as in the second embodiment. Furthermore, after the recording linear velocity is determined as in the fourth embodiment, the temperature control in the B / A value uncontrollable region may be enabled as in the third embodiment. FIG. 9 shows a block diagram of a recording power control portion having all the configurations described in the first to fourth embodiments.

  As described above, according to the fourth embodiment, stable recording characteristics can be obtained even when the characteristics of the recording power value versus the B / A value are different between high-speed recording and low-speed recording. In addition, the rotational speed of the optical disk can be controlled.

  The optical disk recording apparatus according to the present invention is stable even when there are disturbance fluctuations such as temperature change of laser pickup output, optical disk shape change, disk recording layer recording sensitivity change in data recording at high temperature / low temperature / high speed. Therefore, it is possible to perform recording power control so as to obtain the above-mentioned recording characteristics, and it is useful as an apparatus for stably recording a data signal at high speed and high density on a replaceable, additionally recordable / rewritable optical disk.

1 is a block diagram of a recording power control portion of an optical disk recording apparatus according to Embodiment 1 of the present invention. The figure for demonstrating operation | movement of the optical disk recording device based on Embodiment 2 of this invention. Block diagram of the recording power control portion of the optical disc recording apparatus according to Embodiment 2 of the present invention The figure for demonstrating the operation | movement of recording power control in the optical disk recording device which concerns on Embodiment 3 of this invention. Block diagram of the recording power control portion of the optical disk recording apparatus according to Embodiment 3 of the present invention The figure for demonstrating the operation | movement of recording power control by the temperature fluctuation in Embodiment 3 of this invention. Block diagram of the recording power control portion of the optical disc recording apparatus according to Embodiment 4 of the present invention The figure which shows the matrix table for recording speed determination in Embodiment 4 of this invention. The block diagram of the recording power control part of the optical disk recording device which concerns on other embodiment of this invention The figure which shows an example of the waveform of the laser power value and reflected light amount when recording a data signal on an optical disk Diagram for explaining how to calculate asymmetry value Schematic block diagram relating to recording power control and mechanical control of a conventional optical disk recording apparatus The block diagram which shows the structure of the ROPC part and APC part in the conventional optical disk recording device The block diagram which shows the structure of the path | route which calculates the reflected light of the conventional optical disk recording device The figure for demonstrating the operation | movement of recording power control by B / A value in the conventional optical disk recording device. The figure which shows the fluctuation | variation of the characteristic of recording power value versus B / A value at the time of disturbance occurrence Diagram showing errors in recording characteristics when a disturbance occurs

Explanation of symbols

10 B / A target value correction unit 11, 51, 53, 54 Selector 20 ROPC unit 21 B / A target value storage unit 22, 33 Subtractor 23 ROPC loop filter 24 Recording current correction unit 30 APC unit 31 Recording power target value storage Unit 32, 35 adder 34 WAPC loop filter 36 recording power limiter 40 temperature sensor 41 variable recording power limiter 50 temperature variable recording power target value generation unit 52 B / A value variation inspection unit 60 recording speed determination unit 71 photodiode for main beam 72, 73 Sub-beam photodiode 74, 78 Sample hold circuit 75 TE calculation unit 76 FE calculation unit 77 Adder 79 B / A value calculation unit 100 Recording power control device 101 Semiconductor laser diode 102 Photodiode for monitoring 103 For servo / RF photo Diode 104 B / A value detection unit 105 Servo error detection unit 106 ROPC unit 107 APC unit 108 Servo control unit 109 Mechanical unit 401 Boundary value 402 B / A value controllable area 403 B / A value control impossible area

Claims (23)

A test region that includes laser light irradiation means for irradiating a first laser beam having a light intensity that forms pits and a second laser beam having a light intensity that does not form pits, and is irradiated with the first and second laser beams And before recording data in the data area, the target light intensity of the first laser light and the reflections of the first and second laser lights are reflected in the test area. The target reflected light amount ratio of the reflected light amount ratio measured from the light amount is learned, and the reflected light amount ratio measured during data recording in the data area and the observed light intensity of the first laser light and the learning An optical disk recording apparatus for controlling the first laser light during data recording based on the target reflected light amount ratio and the target light intensity,
During the learning, the test area is irradiated with the second laser beam to obtain a first reproduction reflected light amount, and immediately before the start of data recording, the data area is irradiated with the second laser beam to obtain a second It is configured to obtain the reproduction reflected light amount,
Based on the first and second reproduction reflected light amounts, target reflected light amount ratio correcting means for correcting the learned target reflected light amount ratio to generate an updated target reflected light amount ratio;
The updated target reflected light amount ratio is held during data recording, and the first laser light during data recording is based on the held updated target reflected light amount ratio and the reflected light amount ratio measured during data recording. Target light intensity correction means for generating a light intensity correction amount of
The learned target light intensity is held, the held target light intensity is corrected based on the light intensity correction amount, and the corrected target light intensity and the first laser observed during data recording Based on the light intensity of light, a recording current is generated and output to the laser light irradiation means, and the light intensity of the first laser light during data recording is converged to the corrected target light intensity. And
An optical disc recording apparatus comprising:   2. The optical disc recording apparatus according to claim 1, wherein the target light intensity correction unit generates a recording current correction amount based on the light intensity correction amount in addition to the light intensity correction amount, and stabilizes the light intensity. The means corrects the recording current based on the recording current correction amount and outputs the corrected recording current to the laser beam irradiation means.   The target reflected light amount ratio correcting unit multiplies the learned target reflected light amount ratio by a ratio of the first reproduction reflected light amount and the second reproduced reflected light amount to generate the updated target reflected light amount ratio. The optical disk recording apparatus according to claim 1, wherein the optical disk recording apparatus is an optical disk recording apparatus.   When the additional recording is performed after the data recording is finished, prior to the additional recording operation, a new second reproduction reflected light amount is obtained in the additional recording area on the optical disk, and the new second reproduced reflected light amount is obtained. 4. The optical disc recording apparatus according to claim 1, wherein the learned target reflected light amount ratio is corrected by the target reflected light amount ratio correcting means. A test region that includes laser light irradiation means for irradiating a first laser beam having a light intensity that forms pits and a second laser beam having a light intensity that does not form pits, and is irradiated with the first and second laser beams Before recording data in the data area, the target light intensity of the first laser beam is learned in the test area and observed during data recording in the data area. An optical disk recording apparatus that controls the first laser light during data recording based on the light intensity of the first laser light and the learned target light intensity,
The laser light irradiation means that holds the learned target light intensity, generates a recording current based on the held target light intensity and the light intensity of the first laser light observed during data recording. And a light intensity stabilizing means for converging the light intensity of the first laser light during data recording to the held target light intensity,
Temperature sensor means for detecting the internal temperature of the optical disk recording device;
Variable recording for determining the upper and lower limits of the light intensity of the first laser beam during data recording in accordance with the detected temperature value of the temperature sensor means and controlling the recording current generated by the light intensity stabilizing means Power limiter means;
An optical disc recording apparatus comprising: A test region that includes laser light irradiation means for irradiating a first laser beam having a light intensity that forms pits and a second laser beam having a light intensity that does not form pits, and is irradiated with the first and second laser beams And before recording data in the data area, the target light intensity of the first laser light and the reflections of the first and second laser lights are reflected in the test area. The target reflected light amount ratio of the reflected light amount ratio measured from the light amount is learned, and the reflected light amount ratio measured during data recording in the data area and the observed light intensity of the first laser light and the learning An optical disk recording apparatus for controlling the first laser light during data recording based on the target reflected light amount ratio and the target light intensity,
The learned target reflected light amount ratio is retained, and based on the retained target reflected light amount ratio and the reflected light amount ratio measured during data recording, the light intensity of the first laser light during data recording Target light intensity correction means for generating a correction amount;
The learned target light intensity is held, the held target light intensity is corrected based on the light intensity correction amount, and the corrected target light intensity and the first laser observed during data recording Based on the light intensity of light, a recording current is generated and output to the laser light irradiation means, and the light intensity of the first laser light during data recording is converged to the corrected target light intensity. And
Temperature sensor means for detecting the internal temperature of the optical disk recording device;
Variable recording for determining the upper and lower limits of the light intensity of the first laser beam during data recording in accordance with the detected temperature value of the temperature sensor means and controlling the recording current generated by the light intensity stabilizing means Power limiter means;
An optical disc recording apparatus comprising: An optical disk recording apparatus according to claim 6, wherein
During the learning, the test area is irradiated with the second laser beam to obtain a first reproduction reflected light amount, and immediately before the start of data recording, the data area is irradiated with the second laser beam to obtain a second It is configured to obtain the reproduction reflected light amount,
Based on the first and second reproduction reflected light amounts, the target reflected light amount ratio correcting means for correcting the learned target reflected light amount ratio to generate an updated target reflected light amount ratio,
The target light intensity correction means holds the updated target reflected light amount ratio during data recording, and the light intensity based on the held updated target reflected light amount ratio and the reflected light amount ratio measured during data recording. An optical disk recording apparatus that generates a correction amount.   8. The optical disc recording apparatus according to claim 6, wherein the target light intensity correction unit generates a recording current correction amount based on the light intensity correction amount in addition to the light intensity correction amount. The optical intensity recording means corrects the recording current based on the recording current correction amount and outputs the corrected recording current to the laser light irradiation means.   9. The optical disk recording according to claim 5, wherein the variable recording power limiter unit determines an upper limit and a lower limit of the light intensity of the first laser beam for each predetermined temperature range for each media manufacturer. apparatus. A test region that includes laser light irradiation means for irradiating a first laser beam having a light intensity that forms pits and a second laser beam having a light intensity that does not form pits, and is irradiated with the first and second laser beams And before recording data in the data area, the target light intensity of the first laser light and the reflections of the first and second laser lights are reflected in the test area. The target reflected light amount ratio of the reflected light amount ratio measured from the light amount is learned, and the reflected light amount ratio measured during data recording in the data area and the observed light intensity of the first laser light and the learning An optical disk recording apparatus for controlling the first laser light during data recording based on the target reflected light amount ratio and the target light intensity,
During the learning, the light intensity of the first laser light is changed stepwise in the test area to form a predetermined pit, and the reflected light amount ratio is measured for each light intensity,
The learned target reflected light amount ratio is retained, and based on the retained target reflected light amount ratio and the reflected light amount ratio measured during data recording, the light intensity of the first laser light during data recording Target light intensity correction means for generating a correction amount;
The learned target light intensity is held, the held target light intensity is corrected based on the light intensity correction amount, and the corrected target light intensity and the first laser observed during data recording Based on the light intensity of light, a recording current is generated and output to the laser light irradiation means, and the light intensity of the first laser light during data recording is converged to the corrected target light intensity. And
Temperature sensor means for detecting the internal temperature of the optical disk recording device;
A temperature variable target light intensity generating means for generating an updated target light intensity according to a detected temperature value of the temperature sensor means;
Based on the reflected light amount ratio and the learned target light intensity for each of the stepwise changed light intensities measured at the time of learning, the light intensity of the first laser light in the data area and the A recording power boundary value that divides the characteristic of the reflected light amount ratio into two regions is obtained, the light intensity of the first laser beam observed during data recording is compared with the recording power boundary value, and observation is performed during data recording. When the light intensity of the first laser light is less than the recording power boundary value or less than the recording power boundary value, the light intensity correction amount is input to the light intensity stabilizing means, and the recording power boundary value or more is input. Alternatively, the reflected light amount ratio variation inspection means for stopping the input of the light intensity correction amount to the light intensity stabilizing means when detecting that the recording power boundary value is exceeded,
And when the detection by the reflected light amount ratio variation inspection means is performed, the light intensity stabilization means replaces the learned target light intensity with the update target generated by the temperature variable target light intensity generation means. An optical disc recording apparatus that generates the recording current based on light intensity.   The reflected light amount ratio variation inspection means is configured to determine the reflected light amount ratio with respect to each stepwise changed light intensity based on the reflected light amount ratio for each stepwise changed light intensity measured during the learning. Is calculated, and the inclination in the vicinity of the learned target light intensity is obtained from the calculated inclination group, and the light intensity equal to or greater than the learned target light intensity among the stepwise changed light intensities. Difference values between the inclination corresponding to the target light intensity and the inclination in the vicinity of the target light intensity are respectively compared, and each absolute value of the difference value group is sequentially compared with a predetermined threshold value. 11. The optical disc recording apparatus according to claim 10, wherein the light intensity from which the inclination corresponding to the difference value determined to be large is calculated is stored as the recording power boundary value.   The temperature-variable target light intensity generation means calculates the detected temperature value output from the temperature sensor means and the light intensity of the first laser light observed when the detection is made by the reflected light amount ratio fluctuation inspection means. And storing the stored light intensity as the updated target light intensity in the light intensity stabilizing means. After the detection, the light of the first laser light observed during data recording is stored. Every time the difference in increase / decrease between the stored detected temperature value and the detected temperature value output from the temperature sensor means reaches a predetermined value until the intensity is less than the recording power boundary value or less than the recording power boundary value, it is stored. The light intensity is increased / decreased by a predetermined correction amount, the light intensity after the increase / decrease and the detected temperature value output from the temperature sensor means are stored again, and the light intensity after the increase / decrease is also stored. Optical disc recording apparatus according to any one of claims 10 or 11, characterized in that to be stored in the light intensity stabilization unit as the update target light intensity. The optical disk recording device according to any one of claims 10 to 12,
During the learning, the test area is irradiated with the second laser beam to obtain a first reproduction reflected light amount, and immediately before the start of data recording, the data area is irradiated with the second laser beam to obtain a second It is configured to obtain the reproduction reflected light amount,
Based on the first and second reproduction reflected light amount ratios, the target reflected light amount ratio correcting means for correcting the learned target reflected light amount ratio to generate an updated target reflected light amount ratio,
The target light intensity correction means holds the updated target reflected light amount ratio during data recording, and the light intensity based on the held updated target reflected light amount ratio and the reflected light amount ratio measured during data recording. An optical disk recording apparatus that generates a correction amount.   14. The optical disk recording apparatus according to claim 10, wherein the target light intensity correction unit generates a recording current correction amount based on the light intensity correction amount in addition to the light intensity correction amount. The light intensity stabilizing means corrects the recording current based on the recording current correction amount and outputs the corrected current to the laser light irradiation means, and the reflected light amount ratio variation inspection means is observed during data recording. When the light intensity of the first laser beam is less than the recording power boundary value or less than the recording power boundary value, the light intensity correction amount and the recording current correction amount are input to the light intensity stabilizing unit, and the recording power Light that stops input of the light intensity correction amount and the recording current correction amount to the light intensity stabilizing means when it is detected that the value exceeds a boundary value or exceeds the recording power boundary value Disk recording device. An optical disk recording device according to any one of claims 10 to 13,
First selector means for selecting the learned target light intensity and the updated target light intensity generated by the temperature variable target light intensity generating means and outputting the selected target light intensity to the light intensity stabilizing means;
Second selector means for selecting the light intensity correction amount generated by the target light intensity correction means and a zero value and outputting the selected value to the light intensity stabilization means;
And when the light intensity of the first laser beam observed during data recording is detected to be greater than or equal to the recording power boundary value or exceeding the recording power boundary value, the reflected light amount ratio variation inspection means generates a flag signal And the first selector means selects the update target light intensity when the flag signal is turned on, and the second selector means selects a zero value when the flag signal is turned on. Recording device. The optical disk recording apparatus according to claim 14, wherein
First selector means for selecting the learned target light intensity and the updated target light intensity generated by the temperature variable target light intensity generating means and outputting the selected target light intensity to the light intensity stabilizing means;
Second selector means for selecting the light intensity correction amount generated by the target light intensity correction means and a zero value and outputting the selected value to the light intensity stabilization means;
Third selector means for selecting the recording current correction amount and zero value generated by the target light intensity correction means and outputting them to the light intensity stabilization means;
And when the light intensity of the first laser beam observed during data recording is detected to be greater than or equal to the recording power boundary value or exceeding the recording power boundary value, the reflected light amount ratio variation inspection means generates a flag signal And the first selector means selects the update target light intensity when the flag signal is turned on, and the second and third selector means select a zero value when the flag signal is turned on. An optical disk recording apparatus.   17. The optical disk recording apparatus according to claim 10, wherein the recording power boundary value is provided with a hysteresis characteristic, and the reflected light amount ratio variation inspection means is the first observation observed during data recording. When the light intensity of the laser beam is less than the recording power boundary value or less than the recording power boundary value, the comparison is performed using the recording power boundary value, and the recording power boundary value is greater than or exceeds the recording power boundary value. An optical disk recording apparatus characterized in that the comparison is sometimes performed using a recording power value obtained by reducing the recording power boundary value by a predetermined amount. A test region that includes laser light irradiation means for irradiating a first laser beam having a light intensity that forms pits and a second laser beam having a light intensity that does not form pits, and is irradiated with the first and second laser beams And before recording data in the data area, the target light intensity of the first laser light and the reflections of the first and second laser lights are reflected in the test area. The target reflected light amount ratio of the reflected light amount ratio measured from the light amount is learned, and the reflected light amount ratio measured during data recording in the data area and the observed light intensity of the first laser light and the learning An optical disk recording apparatus for controlling the first laser light during data recording based on the target reflected light amount ratio and the target light intensity,
During the learning, the light intensity of the first laser light is changed stepwise in the test area to form a predetermined pit, and the reflected light amount ratio is measured for each light intensity,
The learned target reflected light amount ratio is retained, and based on the retained target reflected light amount ratio and the reflected light amount ratio measured during data recording, the light intensity of the first laser light during data recording Target light intensity correction means for generating a correction amount;
The learned target light intensity is held, the held target light intensity is corrected based on the light intensity correction amount, and the corrected target light intensity and the first laser observed during data recording Based on the light intensity of light, a recording current is generated and output to the laser light irradiation means, and the light intensity of the first laser light during data recording is converged to the corrected target light intensity. And
Based on the ratio of the reflected light amount for each light intensity that is changed in stages measured at the time of learning and the learned target light intensity, the light intensity and the reflection of the first laser light in the data area A reflected power ratio variation inspection means for calculating a recording power boundary value that divides the characteristics of the light amount ratio into two regions, and further calculating a difference amount between the determined recording power boundary value and the learned target light intensity;
Recording speed determining means for determining the optical disk rotation speed based on the difference amount and the optical disk rotation speed designated from the outside;
And recording data in the data area at an optical disk rotation speed determined by the recording speed determination means.   The reflected light amount ratio variation inspection means is configured to determine the reflected light amount ratio with respect to each stepwise changed light intensity based on the reflected light amount ratio for each stepwise changed light intensity measured during the learning. Is calculated, and the inclination in the vicinity of the learned target light intensity is obtained from the calculated inclination group, and the light intensity equal to or greater than the learned target light intensity among the stepwise changed light intensities. Difference values between the inclination corresponding to the target light intensity and the inclination in the vicinity of the target light intensity are respectively compared, and each absolute value of the difference value group is sequentially compared with a predetermined threshold value. 19. The optical disk recording apparatus according to claim 18, wherein the recording power boundary value is a light intensity from which the inclination corresponding to the difference value determined to be large is calculated.   20. The optical disk recording apparatus according to claim 18, wherein the recording speed determining means determines table data for determining a final recording speed from the difference amount and a recording speed designated from the outside. And recording data in the data area at a recording speed determined by the recording speed determining means.   21. The optical disc recording apparatus according to claim 20, wherein the recording speed determining means holds the table information for each media manufacturer in advance and determines a recording speed for each media manufacturer. apparatus.   22. The optical disk recording apparatus according to claim 20, wherein the recording speed determining means is unable to record when the recording speed cannot be determined when determining the recording speed based on the table information. An optical disk recording apparatus characterized by teaching to the outside. 23. The optical disc recording device according to claim 18,
During the learning, the test area is irradiated with the second laser beam to obtain a first reproduction reflected light amount, and immediately before the start of data recording, the data area is irradiated with the second laser beam to obtain a second It is configured to obtain the reproduction reflected light amount,
Based on the first and second reproduction reflected light amounts, the target reflected light amount ratio correcting means for correcting the learned target reflected light amount ratio to generate an updated target reflected light amount ratio,
The target light intensity correction means holds the updated target reflected light amount ratio during data recording, and the light intensity based on the held updated target reflected light amount ratio and the reflected light amount ratio measured during data recording. An optical disk recording apparatus that generates a correction amount.

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