JP4423526B2 - Recording apparatus and method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a recording apparatus and method, for example, a write once (WO: Write Once) type optical disc such as a CD-R (Compact Disc-Recordable) in which information can be written only once in the same location, and information repeatedly in the same location. The present invention is suitable for application to an optical disc apparatus that reads and writes data on a rewritable (RW) type optical disc such as a CD-RW.
[0002]
[Prior art]
Conventionally, in this type of optical disc apparatus, recording data is recorded by irradiating a recording surface of the optical disc with a light beam modulated in accordance with the recording data.
[0003]
By the way, when the intensity of the light beam exceeds a predetermined reference range corresponding to the material and linear velocity forming the recording surface, the length of the recording mark formed on the recording surface becomes shorter and shorter than the predetermined reference length. Therefore, there is a case where the recording data reproduced based on the recording mark cannot be reproduced correctly.
[0004]
Therefore, the conventional optical disk apparatus has a power provided on the innermost circumference of the optical disk for the purpose of setting the recording mark to a predetermined reference length (to optimize the recording state) before recording the recording data on the optical disk. Test writing data is recorded in the calibration area (PCA; PowerCalibration Area), and based on the recording result, the optimum power that is the power of the light beam when the recording mark reaches a predetermined reference length is detected. Has been made. The process from recording the trial writing data to detecting the optimum power of the light beam is called power calibration.
[0005]
In practice, in the conventional power calibration, the spindle motor that rotates the optical disk is controlled so as to have a rotation speed inversely proportional to the track radius of the optical disk. In this case, the linear velocity of the track recorded and reproduced by the optical disc apparatus is constant everywhere on the optical disc. This method of controlling the spindle motor so that the linear velocity is constant is called a CLV (Constant Linear Velocity) mode.
[0006]
Then, predetermined data for trial writing is sequentially recorded by sequentially irradiating the power calibration area with a light beam whose power changes stepwise according to the material and linear velocity of the recording surface of the optical disk. Subsequently, each recorded trial writing data is sequentially reproduced, and each asymmetry is detected from each reproduced trial writing data. Based on each detected asymmetry, an optimum power is detected from each power of the light beam applied to the power calibration area.
[0007]
When recording data, the spindle motor is controlled in the CLV mode in the same way as during power calibration, and the recording data is recorded by irradiating the recording surface of the optical disc with a light beam of the optimum power detected by power calibration. To do.
[0008]
When recording data is recorded in the CLV mode in this way, the recording density on the track of the optical disk becomes constant everywhere on the recording surface, so that the storage capacity of the optical disk can be increased.
[0009]
[Problems to be solved by the invention]
Recently, a recording process using a CAV (Constant Angular Velocity) mode, which controls the spindle motor so that the angular velocity of the spindle motor is constant, has been proposed. According to the recording process in the CAV mode, the linear velocity increases toward the inner peripheral side, so that the recording time can be shortened as compared with the CLV mode.
[0010]
However, when recording data in the CAV mode, a power calibration method for detecting the optimum power of the light beam according to the linear velocity has not been established yet.
[0011]
If the power calibration is performed in the CLV mode, it is necessary to switch the spindle motor control mode between the power calibration and the recording of the recording data, and there is a problem that the rotation control of the spindle motor becomes complicated. . By the way, when power calibration is performed in the CLV mode, the rotation speed of the spindle motor increases toward the inner circumference, so when recording trial data in the power calibration area provided on the innermost circumference of the optical disc, the spindle The motor speed is maximized. For this reason, the rotation control of the spindle motor becomes severe during power calibration.
[0012]
Therefore, when recording the recording data in the CAV mode using such an optical disc apparatus, if the optimum power of the light beam corresponding to the linear velocity can be detected by the power calibration, the detected light beam of the optimum power is recorded on the recording surface of the optical disc. It is considered that high-quality recording data can be recorded by irradiating the light.
[0013]
The present invention has been made in consideration of the above points, and even when recording data by irradiating the recording surface of the disk-shaped recording medium with a light beam while rotationally driving the disk-shaped recording medium at a constant angular velocity, An object of the present invention is to propose a recording apparatus and method capable of recording high-quality recording data.
[0014]
[Means for Solving the Problems]
  In order to solve this problem, in the present invention,A spiral track was formedIn a recording apparatus for recording recording data by irradiating a recording area of a disk-shaped recording medium with a light beam modulated according to the recording data, a rotation driving means for rotating the disk-shaped recording medium at a constant angular velocity; Of a disk-shaped recording medium that is rotationally driven by a rotational driving means.Provided on the inner circumference side of the recording areaIn the trial writing areaMultiple unit areasPredetermined data for trial writingWith a light beam of constant powerRecording means for recording, and trial writing area of disc-shaped recording medium by recording meansRecorded in each unit area inPlayback means for playing back the recorded trial writing data;Select the trial writing data with the best recording state from the trial writing data reproduced from each unit area, measure the linear velocity of the disc-shaped recording medium when recording the selected trial writing data, and measure the measured line Detect optimal power of light beam based on speed and power of light beamWith detection meansThe recording means records the data for trial writing in a plurality of different unit areas in the trial writing area with light beams having different powers, and the detecting means has the best recording state with light beams with different powers. Measure the linear velocity of the disc information recording medium at the time of recording the test writing data, and detect the optimum power based on the linear expression of the proportional relationship between the obtained linear velocity and the power of the light beam.I did it.
[0015]
  As a result, in this recording device,Record trial writing data in multiple unit areas with light beams of different power, measure the linear velocity when recording the best trial writing data with each light beam power, and obtain the linear velocity The optimal power of the light beam is detected based on a linear expression of the proportional relationship between the power of the light beam and the power of the light beam.A light beam with an optimum power can be irradiated.
[0016]
  In the present invention,A spiral track was formedIn a recording method for recording recording data by irradiating a recording area of a disk-shaped recording medium with a light beam modulated in accordance with the recording data, a first step of rotationally driving the disk-shaped recording medium at a constant angular velocity; The disk-shaped recording medium that is rotated by the rotation driving meansProvided on the inner circumference side of the recording areaIn the trial writing areaMultiple unit areasPredetermined data for trial writingWith a light beam of constant powerA second step of recording, and a third step of reproducing the trial writing data recorded in the trial writing area of the disc-shaped recording medium in the second step;Select the trial writing data with the best recording state from the trial writing data reproduced from each unit area, measure the linear velocity of the disc-shaped recording medium when recording the selected trial writing data, and measure the measured line Detect optimal power of light beam based on speed and power of light beamAnd the fourth stepPossessIn the second step,Record trial writing data in different unit areas in the trial writing area with light beams of different powers,In the fourth step,Measure the linear velocity of the disc information recording medium at the time of recording the test writing data with the best recording state with light beams with different powers, and the straight line of the proportional relationship between the obtained linear velocity and the power of the light beam The optimum power is detected based on the formula.
[0017]
  As a result, with this recording method,Record trial writing data in multiple unit areas with light beams of different power, measure the linear velocity when recording the best trial writing data with each light beam power, and obtain the linear velocity The optimal power of the light beam is detected based on a linear expression of the proportional relationship between the power of the light beam and the power of the light beam.A light beam with an optimum power can be irradiated.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
[0019]
(1) Overall configuration of optical disc apparatus according to the embodiment
In FIG. 1, reference numeral 10 denotes an optical disk apparatus according to the present embodiment as a whole. Data D1 given from the host computer 11 is recorded on an optical disk 12 such as a CD-R or CD-RW in the CAV mode, or is recorded on the optical disk. 12 can be reproduced.
[0020]
Actually, in the optical disc apparatus 10, in the recording mode, data D1 sequentially given from the host computer 11 is taken in through an interface unit 20 such as SCSI (Small Computer System Interface), and this is input through the encoder unit 21. The data is sequentially stored in the buffer memory 22.
[0021]
The encoder unit 21 includes a layered ECC (Error Correcting Code) addition processing unit 23, a CIRC (Cross Interleave Reed-Solomon Code) encoding processing unit 24, and an EFM (Eight to Fourteen Modulation) modulation processing unit 25. The stored data D1 is sequentially read out in units of sectors, an error correction code is added to the data D1 by the layered ECC adding unit 23, and then the CIRC encoding processing unit 24 performs CIRC encoding processing and synchronous data insertion processing, and further EFM. After performing EFM modulation in the modulation processing unit 25, the obtained write data D <b> 2 is sent to the optical pickup 27 via the RF amplifier 26.
[0022]
The optical pickup 27 includes optical system devices such as a laser diode, a collimator lens, an objective lens and a light receiving element, and an electrical system device such as a laser diode driver, and a light beam modulated in accordance with supplied write data D2. The program area of the optical disk 12 shown in FIG.
[0023]
At this time, the optical pickup 27 generates a servo error signal S1 such as a tracking error signal and a focus error signal and a push-pull signal S2 based on the reflected light from the optical disc 12, and the servo error signal S1 is transmitted to the RF amplifier 26. The push-pull signal S2 is sent to an ATIP (Absolute Time In Pre-groove) decoder unit 29.
[0024]
The servo control unit 28 controls the thread motor 33 via the thread driver 32 based on the supplied servo error signal S1, thereby forming a beam spot of the light beam irradiated on the optical disk 12 on the recording surface. The optical disk 12 is moved in the radial direction along the data track. The servo control unit 28 performs tracking control and focus control by causing the biaxial actuator driver 34 to control a biaxial actuator (not shown) in the optical pickup 27 based on the supplied servo error signal S1.
[0025]
On the other hand, the ATIP decoder 29 detects the absolute address of the beam spot at that time on the optical disc 12 by decoding the supplied push-pull signal S2, and sends it to a CPU (Central Processing Unit) 35.
[0026]
That is, the ATIP decoder unit 29 includes the push-pull signal S2 in the push-pull signal S2 by passing the band-pass filter circuit in the range of ± 1 [kHz] with the center frequency provided therein being 22.05 [kHz]. After extracting the wobble component, FM demodulation processing is performed on the wobble component to detect the absolute address on the optical disc 12 where the beam spot is located at that time, and this is sent to the CPU 35 as an address information signal S3.
[0027]
Further, the ATIP decoder unit 29 is a sync interrupt for informing this every time the absolute address on the optical disk 12 obtained by the above decoding process changes, in other words, every time the sector in which the beam spot on the optical disk 12 is operated changes. The signal S4 is sent to the CPU 35.
[0028]
The CPU 35 sequentially recognizes the recording position at that time on the optical disk 12 based on the supplied address information signal S3 and sync interrupt signal S4, and based on the recognition result, the servo control unit 28 via the spindle driver 30. The optical disk 12 is rotationally driven by controlling the spindle motor 31 in the CAV mode. Thereby, the CPU 35 correctly records the recording data D2 on the optical disk 12.
[0029]
On the other hand, in the playback mode, the CPU 35 controls the servo control unit 28 to rotate and drive the optical disc 12 at a predetermined speed and to make the beam spot the data track of the optical disc 12 in the same manner as in the recording mode. And tracking control and focus control.
[0030]
Further, the CPU 35 drives a laser diode in the optical pickup 27 to emit a light beam toward the optical disk 12. As a result, this light beam is reflected on the recording surface of the optical disk 12, and read data D <b> 3 composed of an RF signal obtained based on the reflected light is sent from the optical pickup 27 to the decoder unit 36 via the RF amplifier 26. The
[0031]
The decoder unit 36 includes a PLL (Phase Locked Loop) circuit 37, a synchronization data detection unit 38, an EFM demodulation unit 39, a CIRC decoding unit 40, and a layered ECC demodulation unit 41, and read data supplied from the PLL circuit 37. The clock CLK is extracted from D3, and the clock CLK and read data D3 are sent to the synchronous data detection unit 38.
[0032]
The synchronization data detection unit 38 reads the synchronization data D3 from the read data D3 based on the supplied clock CLK._syncAre sequentially detected, and based on the detection result, read data D3 is sequentially sent to the EFM demodulator 39 in predetermined units.
[0033]
The read data D3 is then EFM demodulated in the EFM demodulator 39, CIRC decoded in the CIRC decoder 40, and further subjected to error correction in the layered ECC demodulator 41, so that the format before recording is obtained. The data is converted to the data D4 and then sent to the host computer 11 via the interface circuit 20.
[0034]
In this way, the optical disk apparatus 10 records the data D1 supplied from the host computer 11 on the optical disk 12, or reproduces the data recorded on the optical disk apparatus 12 and sends it to the host computer 11. It is made to be able to.
[0035]
(2) Power calibration and recording process in the optical disc apparatus 10
Next, power calibration and recording processing in the optical disc apparatus 10 will be described.
[0036]
In the case of this optical disc apparatus 10, the power calibration area provided on the innermost circumference of the optical disc 12 while rotating the spindle motor 30 in the CAV mode and keeping the light beam power constant before recording the data D1. A recording mark representing the trial writing data is formed by irradiating the recording mark, and an optimum power, which is the power of the light beam when the formed recording mark has a predetermined reference length, is detected.
[0037]
In this case, prior to recording the data D1, the CPU 35 controls the spindle motor 30 to rotate at a predetermined angular velocity in the CAV mode via the servo control unit 28, and controls the thread motor 33 and the biaxial actuator. Then, the optical pickup 27 is moved so that the current position of the beam spot falls within the lead-in area.
[0038]
Further, the CPU 35 irradiates a light beam into the lead-in area sequentially through the RF amplifier 26 and the optical pickup 27, photoelectrically converts the reflected light from the lead-in area through the optical pickup 27, and converts the converted electric signal. The start time information S10 indicating the start time of the lead-in area is extracted from the inside, and the extracted start time information S10 is sent to the CPU 35.
[0039]
The start time of this lead-in area is uniquely determined by the manufacturer and material of the optical disk 12. In that sense, it can be said that the start time information S10 includes information on the material of the optical disc 12.
[0040]
Then, the CPU 35 determines the material of the optical disk 12 from the supplied start time information S10, and then determines the determined material and linear velocity of the optical disk 12 based on a correspondence table (not shown) stored in the memory 42. Is read out, and the read power is determined as the power at the time of power calibration.
[0041]
Further, the CPU 35 controls the sled motor 33 and the biaxial actuator while controlling the rotation of the spindle motor 30 in the CAV mode via the servo control unit 28 so that the current position falls within the power calibration area. The optical pickup 27 is moved.
[0042]
Here, as shown in FIG. 3, the CPU 35 selects a predetermined unused 15 frames in the test area on the inner circumference side of the power calibration area composed of 1500 frames for each power calibration. Then, the power of the light beam is set to the above power via the RF amplifier 26 and the optical pickup 27, and trial writing data is sequentially recorded in a total of 15 small areas (hereinafter, this trial writing is referred to as “first trial writing”). The cumulative frequency in the power calibration is entered in the count area on the outer periphery side of the power calibration area.
[0043]
At this time, the optical pickup 27 calculates the asymmetry of each frame based on the reflected light from the optical disk 12, sends the calculation result to the CPU 35 as an asymmetry signal S 7 via the RF amplifier 26, and reflects the reflected light from the optical disk 12. The sync mark that appears every frame is extracted from the electrical signal obtained by photoelectric conversion of the signal, and the extracted sync mark is sent to the CPU 35 via the RF amplifier 26 as the sync mark signal S11.
[0044]
However, the sync mark is reflected light from the optical disk 12 at a time interval of 1/75 [sec] when the optical disk 12 is rotationally driven at a recording speed of 1 × speed corresponding to a linear velocity of 1.4 [m / sec]. Appear in an electrical signal obtained by photoelectric conversion.
[0045]
Then, as shown in the test result T1 in FIG. 4, the CPU 35 selects a frame in which the power of the irradiated light beam is optimum among the 15 frames irradiated with the light beam based on the supplied asymmetry signal S7. Then, based on the sync mark signal S11, the frame time interval in the selected frame is calculated, and the power of the light beam and the frame time interval are stored in the memory 42.
[0046]
Incidentally, the frame time interval is A × (1/75) [sec] when the recording speed is A-times. Here, if the frame interval on the optical disk 12 is B [m], the linear velocity is 75 × B / A [m / sec]. Since the frame interval B is a known constant value, the linear velocity is uniquely calculated from the frame time interval. In this sense, it can be said that the frame time interval is information corresponding to the linear velocity.
[0047]
The CPU 35 changes the power of the light beam and repeats the above operation again when the asymmetry does not fall within the predetermined allowable range in any of these 15 frames.
[0048]
Further, in the same manner as described above, the CPU 35 keeps the angular velocity of the spindle motor 30 at a predetermined value and applies a light beam having a predetermined power slightly higher than the power of the first light beam to the next unused 15 frames. Irradiate and record predetermined trial data (hereinafter, this trial is called “second trial”). As shown in the trial result T2 of FIG. The memory 42 stores the light beam power and the frame time interval in the frame where the beam power is optimal.
[0049]
Here, as shown in FIG. 5, the CPU 35 calculates a function of a straight line connecting the above values in the first and second test writings when the vertical axis and the horizontal axis are the light beam power and the frame time interval, respectively. To do.
[0050]
Since the power of the light beam and the frame time interval are proportional to each other, the CPU 35 calculates the optimum amount of light beam power corresponding to the frame time interval based on the linear equation.
[0051]
Thus, the CPU 35 calculates the frame time interval based on the sync mark signal S11 that is sequentially supplied even in the CAV mode in which the linear velocity changes in accordance with the radial direction when recording the recording data D1, and then the frame time interval. The optimum power of the light beam corresponding to the above is detected from the above linear equation, and the optical beam 12 is irradiated onto the optical disk 12 through the RF amplifier 26 and the optical pickup 27 in order, and the recording data D1 is recorded.
[0052]
In this manner, in this optical disc apparatus 10, the optimum power of the light beam corresponding to the frame time interval is detected in the power calibration while controlling the spindle motor 31 so that the angular velocity is constant, and the detected optimum Recording data D1 is recorded on the optical disk 12 based on the light beam.
[0053]
(3) Processing of CPU 35 in recording mode
Next, a series of processing procedures of the CPU 35 during power calibration and recording will be described.
[0054]
In this optical disc apparatus 10, when the optical disc 12 is inserted into an optical disc drive (not shown), the CPU 35 performs power calibration and recording according to the recording processing procedure shown in FIG.
[0055]
That is, when the optical disk 12 is inserted into the optical disk drive, the CPU 35 starts this recording processing procedure at SP1.
[0056]
Next, the CPU 35 proceeds to step SP2 and determines the type of the optical disk.
[0057]
That is, the CPU 35 rotates the spindle motor 31 at a predetermined angular velocity sequentially via the servo control unit 28 and the spindle driver 30 and measures the moment of inertia of the rotating optical disk 12 via measurement means (not shown), and based on the measurement result. Then, it is determined whether the size of the optical disk 12 is a radius of 8 [cm] or 12 [cm].
[0058]
Subsequently, the CPU 35 controls the sled motor 33 and the biaxial actuator via the servo control unit 28 to move the optical pickup 27 so that the current position of the beam spot falls within the lead-in area.
[0059]
Then, the CPU 35 sequentially irradiates the optical disk 12 with the light beam through the RF amplifier 26 and the optical pickup 27, and the optical disk 12 is connected to the CD based on the reflectance of the reflected light from the optical disk 12 through the optical pickup 27. -RW or other optical disc such as CD-R and CD-ROM (ROM: Read Only Memory), and the CPU 35 via the RF amplifier as a first medium discrimination signal S9. To send.
[0060]
Further, the CPU 35 sends a signal generated based on the reflected light from the optical disc 12 to the ATIP decoder unit 29 via the optical pickup 27, and then sends this signal supplied via the ATIP decoder unit 29. Decoding processing is performed to determine whether or not the absolute address of the beam spot at that time on the optical disk 12 has been detected, that is, whether it is a CD-R or a CD-ROM, and the determination result is used as the second medium determination signal S8. To the CPU 35.
[0061]
Based on the supplied first medium determination signal S9, the CPU 35 determines whether the optical disk 12 is a CD-RW or another optical disk such as a CD-R or CD-ROM, and is supplied. Based on the second medium determination signal S8, it is determined whether the optical disk 12 is a CD-R or a CD-ROM.
[0062]
Further, the CPU 35 extracts the special information 2 from the reflected light from the lead-in area to the optical pickup 27 and sends the extracted special information 2 to the CPU 35 as a material determination signal S10 for determining the material of the optical disk 12. The material of the optical disc 12 is discriminated from the supplied material discrimination signal S10.
[0063]
Next, the CPU 35 proceeds to step SP3 and waits until an instruction is given from the host computer 11, and when an instruction is given from the host computer 11, the CPU 35 proceeds to step SP4 and determines whether this instruction is a recording instruction.
[0064]
If the CPU 35 obtains a negative result in step SP4, the CPU 35 executes the instruction, returns to step SP3, waits until an instruction is given again from the host computer 11, and responds positively in step SP4. If it is obtained, in the subsequent step S6, based on the correspondence table stored in the memory 42, the power of the appropriate amount of light beam corresponding to the determined material of the optical disk 12 and the angular velocity is read, and the read power is power calibrated. Determined as power at the time of
[0065]
Then, the CPU 35 proceeds to step SP7 and performs the first trial writing process.
[0066]
That is, the CPU 35 controls the sled motor 33 and the biaxial actuator while controlling the rotation of the spindle motor 30 in the CAV mode via the servo control unit 28 so that the current position falls within the power calibration area. The optical pickup 27 is moved.
[0067]
Here, the CPU 35 selects predetermined unused 15 frames in the test area on the inner periphery side of the power calibration area, sets the power of the light beam to the above power via the RF amplifier 26 and the optical pickup 27. Then, trial writing data is sequentially recorded in a total of 15 small areas, and the cumulative frequency of power calibration is entered in the count area on the outer periphery side of the power calibration area.
[0068]
At this time, the optical pickup 27 calculates the asymmetry of each frame based on the reflected light from the optical disk 12, sends the calculation result to the CPU 35 as an asymmetry signal S 7 via the RF amplifier 26, and reflects the reflected light from the optical disk 12. Is converted into an electrical signal, a sync mark appearing for each frame of the optical disk 12 is extracted from the electrical signal, and the extraction result is sent to the CPU 35 as a sync mark signal S11 via the RF amplifier 26.
[0069]
Subsequently, in step SP8, the CPU 35 selects a frame in which the power of the irradiated light beam is optimal from the 15 frames irradiated with the light beam based on the supplied asymmetry signal S7, and the asymmetry in the selected frame. Is determined to be within a predetermined allowable range.
[0070]
If the CPU 35 obtains a negative result in step SP8, it returns to step SP7 and performs the first trial writing process again. On the other hand, if it obtains a positive result in step SP8, it returns to SP9. Then, based on the sync mark signal S11, a frame time interval in a frame in which the power of the irradiated light beam is an optimum amount is calculated, and the power of the light beam and the frame time interval are stored in the memory 42.
[0071]
Then, in the processing from step SP10 to step SP12, the CPU 35 performs the first time for the next unused 15 frames while maintaining the angular velocity of the spindle motor 30 in the same manner as the processing from step SP7 to step SP9. A light beam with a predetermined power slightly larger than the power of the light beam at the time of the test writing process is irradiated, and from these 15 frames, the power of the light beam and the frame time interval in the frame where the power of the irradiated light beam is the optimum amount are stored 42.
[0072]
Subsequently, the CPU 35 proceeds to step SP13, and calculates the function of the straight line connecting the above values in the first and second test writing processes, where the vertical axis and the horizontal axis are the light beam power and the frame time interval, respectively. To do.
[0073]
Since the power of the light beam and the frame time interval are proportional to each other, the CPU 35 calculates the optimum amount of light beam power corresponding to the frame time interval based on the above linear equation, and ends the power calibration. To do.
[0074]
Next, the CPU 35 records the recording data D1 in the program area of the optical disc 12 in step SP14.
[0075]
That is, the CPU 35 moves the optical pickup 27 so that the current position falls within the program area by controlling the sled motor 33 and the biaxial actuator via the servo control unit 28 while maintaining the angular velocity of the spindle motor 31. To do.
[0076]
Then, the CPU 35 calculates the frame time interval based on the sync mark signal S11 that is sequentially supplied, then calculates the optimum power of the light beam corresponding to this frame time interval from the above linear equation, and calculates the calculated power of the light beam. Are recorded on the optical disc 12 through the RF amplifier 26 and the optical pickup 27 in order.
[0077]
Then, the CPU 35 proceeds to step SP15 to determine whether or not the recording process for all the data D1 given from the host computer 11 has been completed. If it is determined that the recording process has been completed, the CPU 35 proceeds to step SP16. The process ends.
[0078]
(4) Operation and effect of the present embodiment
In the above configuration, in the optical disc apparatus 10, the trial motor is performed at least twice while the spindle motor 31 is set to the CAV mode, and the light beam corresponding to the frame time interval is based on the result of each trial writing process. To detect the optimal power.
[0079]
As a result, since the optical disc apparatus 10 detects the optimum power of the light beam corresponding to the frame time interval, it is possible to irradiate the recording surface of the optical disc 12 with the light beam having the optimum power. Since the spindle motor 31 needs to be set in the CLV mode through power calibration and recording processing, the rotation control of the spindle motor 31 is facilitated.
[0080]
According to the above configuration, at least two trial writing processes are performed while the spindle motor 31 is set to the CAV mode, and the optimum power of the light beam corresponding to the frame time interval is determined based on the result of each trial writing process. Thus, the optical disk recording apparatus 10 can record the recording data D1 by irradiating the recording surface of the optical disk 12 with the light beam having the optimum power, and thus can record the high-quality recording data. realizable.
[0081]
(5) Other embodiments
In the above-described embodiment, the case where the angular velocities in the first and second test writing processes are set to the same value has been described. However, the present invention is not limited to this, and the first and second times. Different values may be set during the trial writing process.
[0082]
In the above embodiment, the case where the number of trial writing processes is set to two has been described. However, the present invention is not limited to this, and the number of trial writing processes is set to three or more. Also good. In such a case, a relational expression between the frame time interval and the optimum power of the light beam may be obtained by the least square method.
[0083]
Further, in the above-described embodiment, the case where the optical disk 12 such as CD-R and CD-RW is applied as the recording medium has been described. However, the present invention is not limited to this, and for example, CD-R and CD-RW. The present invention may also be applied to writable optical discs such as DVD-R or DVD-RAM (DVD: Digital Versatile Disc) other than -RW and various other recording media.
[0084]
Further, in the above-described embodiment, the case where the CPU 35, the RF amplification unit 26, and the optical pickup unit 27 are applied as the recording unit and the reproduction unit has been described. However, the present invention is not limited thereto, and for example, an optical pickup The configuration of the RF amplification unit 26 may be included in the unit 27.
[0085]
Furthermore, in the above-described embodiment, the case where the CPU 35 and the memory 42 are applied as detection means has been described. However, the present invention is not limited to this, and the configuration of the memory 42 may be included in the CPU 35, for example. good.
[0086]
【The invention's effect】
  As described above, according to the present invention, in the recording apparatus and the method thereof,Record trial writing data in multiple unit areas with light beams of different power, measure the linear velocity when recording the best trial writing data with each light beam power, and obtain the linear velocity The optimal power of the light beam is detected based on a linear expression of the proportional relationship between the power of the light beam and the power of the light beam.It is possible to realize a recording apparatus and method that can irradiate a light beam with an optimum power and record high-quality recording data.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a circuit configuration of an optical disc apparatus according to an embodiment.
FIG. 2 is a schematic diagram showing a configuration of an optical disc.
FIG. 3 is a diagram for explaining trial writing in a power calibration area.
FIG. 4 is a graph showing the relationship between frame time intervals and asymmetry.
FIG. 5 is a graph showing the relationship between the frame time interval and the optimum power of the light beam.
FIG. 6 is a flowchart showing an optimal power control processing procedure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Optical disk apparatus, 11 ... Host computer, 12 ... Optical disk, 21 ... Encoding part, 22 ... Buffer memory, 27 ... Optical pick-up, 35 ... CPU, 36 ... Decoder part.

Claims (4)

In the recording apparatus for recording the recording data by irradiating the recording area of the disc-shaped recording medium in which the tracks are formed in a spiral shape with a light beam modulated according to the recording data,
Rotation drive means for rotating the disk-shaped recording medium at a constant angular velocity;
The light beam of the disc-shaped recording medium of the recording area inner peripheral side a predetermined test writing data into a plurality of unit regions definitive in test writing area provided in a certain power that is rotationally driven by the rotary drive means in a recording means for recording,
Reproducing means for reproducing the trial writing data recorded in the unit areas in the trial writing area of the disc-shaped recording medium by the recording means,
The trial writing data with the best recording state is selected from the trial writing data reproduced from each unit area, and the linear velocity of the disc-shaped recording medium is measured when the selected trial writing data is recorded. Detecting means for detecting the optimum power of the light beam based on the measured linear velocity and the power of the light beam ;
With
The recording means is
With the light beams having different powers, the trial writing data is recorded in a plurality of different unit areas in the trial writing area,
The detecting means is
Measure the linear velocity of the disc-shaped recording medium during recording of the test-written data that is best recorded with the light beams having different powers, and obtain the linear velocity and the power of the light beam, respectively. The optimal power is detected based on a linear expression of
Record apparatus. The rotation driving means is
The disk-shaped recording medium is rotationally driven at a constant angular velocity,
The recording means is
The recording data is recorded in the recording area of the disk-shaped recording medium that is rotationally driven by the light beam having the optimum power detected by the detecting means.
The recording apparatus according to 請 Motomeko 1. In the recording method of recording the recording data by irradiating the recording area of the disc-shaped recording medium in which the tracks are formed in a spiral shape with a light beam modulated according to the recording data,
A first step of rotationally driving the disk-shaped recording medium at a constant angular velocity;
Above said first of said disc-shaped recording medium of the recording area inner peripheral side a predetermined test writing data into a plurality of unit regions definitive in test writing area provided in a predetermined power of which is driven to rotate in step A second step of recording with a light beam ;
A third step of reproducing the trial writing data recorded in the trial writing area of the disc-shaped recording medium in the second step;
The trial writing data with the best recording state is selected from the trial writing data reproduced from each unit area, and the linear velocity of the disc-shaped recording medium is measured when the selected trial writing data is recorded. And a fourth step of detecting an optimum power of the light beam based on the measured linear velocity and the power of the light beam ,
In the second step,
With the light beams having different powers, the trial writing data is recorded in a plurality of different unit areas in the trial writing area,
In the fourth step above,
Measure the linear velocity of the disc-shaped recording medium during recording of the test-written data that is best recorded with the light beams having different powers, and obtain the linear velocity and the power of the light beam, respectively. The optimal power is detected based on a linear expression of
Record method. A fifth step of rotationally driving the disc-shaped recording medium at a constant angular velocity;
The fourth of the light beam detected optimum power in step, 請 Motomeko of Ru comprising a sixth step of recording the recording data in the recording area of the disc-shaped recording medium which is driven to rotate 4. The recording method according to 3 .

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