WO2004019324A1 - レーザ出力設定方法および光記録装置 - Google Patents
レーザ出力設定方法および光記録装置 Download PDFInfo
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- WO2004019324A1 WO2004019324A1 PCT/JP2003/010654 JP0310654W WO2004019324A1 WO 2004019324 A1 WO2004019324 A1 WO 2004019324A1 JP 0310654 W JP0310654 W JP 0310654W WO 2004019324 A1 WO2004019324 A1 WO 2004019324A1
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- information
- identification information
- recording medium
- optical recording
- power calibration
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Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
- G11B7/1267—Power calibration
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0045—Recording
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
- G11B2007/0009—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage
- G11B2007/0013—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage for carriers having multiple discrete layers
Definitions
- the present invention relates to a laser output setting method and an optical recording device.
- a signal is recorded on a disk by irradiating a disk with laser light from an optical pickup. Also, reading of signals recorded on a disk is performed by switching the output of laser light.
- the output of the laser beam is controlled to irradiate the disk so that pits corresponding to the signal to be recorded are formed on the disk.
- the output of the laser beam is not optimal, the pit shape is too large or too small, and the recorded signal cannot be read out correctly. For this reason, a so-called power calibration process in which test writing is performed using the innermost or outermost area of the disc, for example, and the laser light output is set to an optimum state based on the results of the test writing Has been done.
- the signal is recorded by changing the output of the laser beam in the innermost and outermost areas, and the optimal signal is obtained based on the reproduced signal obtained by reproducing the recorded signal. This is for determining the output of the laser light. For this reason, the time for recording the signal, the time for determining the output of the laser beam by reproducing the recorded signal, and the time for moving the optical pickup between the innermost region and the outermost region. Are required, and the processing time is long.
- An object of the present invention is to provide a laser output setting method and an optical output setting method capable of starting signal recording quickly without the need for a buffer memory or the like and performing signal recording with an optimum laser beam output.
- a recording device is provided.
- the laser output setting method includes: a first identification step for identifying whether or not device identification information unique to the device assigned to the optical recording device is recorded on the optical recording medium; In the identification step, when it is identified that the device identification information is recorded, it is determined whether or not the device identification information recorded on the optical recording medium matches the device identification information unique to the device.
- a first identification step for identifying whether or not the recording medium identification information unique to the optical recording medium allocated to the optical recording medium is stored in the storage means of the optical recording device; In the above, it is identified that the recording medium identification information is stored.
- An optical recording device comprises: an optical pickup that irradiates an optical recording medium with laser light to record or reproduce a signal; and a driving unit that drives the optical pickup to output the laser light.
- a storage unit that stores device identification information unique to the device; and a control unit that controls operations of the optical pickup and the driving unit, wherein the control unit stores the device identification information in an optical recording medium. If the device identification information is identified as being recorded, the device identification information recorded on the optical recording medium matches the device identification information unique to the device. Whether the device identification information is not recorded, and that the recorded device identification information does not match the device identification information assigned to the optical recording device.
- the second process is performed on the condition that the second identification result identified as matching with the device identification information assigned to the recording device is obtained as at least one condition,
- a power calibration process is performed to generate power calibration information, an output of a laser beam is set based on the generated power calibration information, and in the second process, The output of the laser beam is set based on the power calibration information recorded on the optical recording medium.
- An optical pickup for irradiating the optical recording medium with a laser beam to record or reproduce a signal; a driving unit for driving the optical pickup to output the laser beam; and a recording medium unique to the optical recording medium.
- Storage means for storing identification information; and control means for controlling the operation of the optical pickup and the driving means, wherein the control means determines whether or not the recording medium identification information is stored in the storage means. If it is determined that the recording medium identification information is stored, the recording medium identification information recorded on the optical recording medium is replaced with the recording medium identification information stored in the storage unit.
- a power calibration process is performed to generate power calibration information, an output of a laser beam is set based on the generated power calibration information, and in the second process, The output of the laser beam is set based on the power calibration information stored in the storage means.
- the recording medium identification information of the optical recording medium and the recording medium identification information stored in the optical recording device or the information recorded on the optical recording medium are recorded. If the device identification information assigned to the optical recording device is compared with the device identification information assigned to the optical recording device, and the comparison result of the identification information indicates that the optical recording medium has not been used, the power calibration is performed. Performs the process to generate power calibration information, and this power calibration information The output of the laser beam is set based on.
- the power calibration information that has already been generated. If it is determined that the information satisfies the information valid condition, the output of the laser beam is set based on the generated power calibration information. If it is determined that the information validity condition is not satisfied, the output of the laser beam is set based on the power calibration information generated by the power calibration process. Further, when the power calibration process is performed, the generated power calibration information and the device identification information are recorded on the optical recording medium, or the generated power calibration information and the recording medium identification information are recorded on the optical recording device. It is memorized.
- the recording medium identification information of the optical recording medium and the recording medium identification information stored in the optical recording device or the device identification information recorded on the optical recording medium and the optical recording device are allocated.
- the comparison with the device identification information is performed, and the execution of the power calibration process is controlled based on the comparison result of the identification information. Therefore, when the optical recording medium has already been used, the recording operation can be started immediately in an optimum state by using the already generated power calibration information. If the optical recording medium is not used, power calibration processing is performed, and the generated calibration information and device identification information are recorded on the optical recording medium, or the generated power calibration information is compared with the generated power calibration information.
- the recording medium identification information is stored in the optical recording device.
- an information valid condition is set for the power calibration information. If the information valid condition is not satisfied, a power calibration process is performed. For this reason, before the recording operation cannot be performed in an optimal state with the power calibration information that has already been generated, power calibration processing is performed and the power calibration information is updated, and the power calibration information is always updated. The recording operation can be performed in an optimal state.
- FIG. 1 is a diagram showing a configuration of a disk.
- FIG. 2 is a diagram showing a configuration of the optical recording device.
- FIG. 3 is a flowchart showing the first embodiment.
- FIG. 4 is a flowchart showing the second mode.
- FIG. 1 shows an optical recording medium on which signals are recorded using a laser beam, for example, an optical disk (hereinafter, referred to as a “disk”).
- FIG. 2 shows an optical recording apparatus for recording signals using the disk shown in FIG. Is shown.
- a test writing area A is provided on the inner peripheral side of the disk 10.
- the test writing area A is an area used for recording a test signal and determining the optimum laser light output by reproducing the recorded test signal.
- a buffer area B is provided on the outer peripheral side of the trial writing area B. The buffer area B is provided for recording information indicating a recording position and the like when performing a signal recording operation.
- the outer peripheral side of the readout area E is an outer peripheral area F.
- test writing area A and the buffer area B may be provided from the outer peripheral side.
- order of each area may be changed.
- a removable disk 10 placed on a turntable 21 is driven to rotate by a spindle motor 22.
- the spindle motor 22 rotates the disk 10 at a desired speed by a spindle drive signal SSD from a motor drive unit 35 described later. It is driven so that
- the optical pickup 25 includes a laser light output element that irradiates the disk 10 with laser light, a photodetector that receives the laser light reflected on the signal surface of the disk 10 and generates an electric signal corresponding to the reflected light, It is composed of an objective lens for properly irradiating the laser beam to a desired position on the signal surface of the disk 10 and an actuator for driving the objective lens.
- the optical pickup 25 irradiates the disk 10 with laser light whose light amount is controlled.
- the laser light reflected by the disk 10 is applied to a light detection processing circuit (not shown) of the optical pickup 25.
- the light detection processing circuit performs photoelectric conversion, current-voltage conversion, and the like, generates a light detection signal Sde based on the reflected light, and supplies the signal to the RF signal processing unit 26.
- the light detection processing circuit monitors the output of the laser light, generates an output monitor signal Spm, and supplies the output monitor signal Spm to a laser drive unit 34 described later.
- the RF signal processing unit 26 generates a read signal Sr based on the light detection signal Sde, shapes the read signal Sr into a waveform, binarizes the read signal Sr, etc. Is generated and supplied to the reproduction signal processing unit 30. In addition, it generates a tracking error signal STE and a focus error signal SFE based on the light detection signal Sde, and supplies them to the service control unit 27. Further, the read signal Sr is supplied to the discrimination signal generation unit 28.
- the servo control unit 27 Based on the supplied focus error signal SFE, the servo control unit 27 sets the objective lens (not shown) of the optical pickup 25 such that the focal position of the laser beam is located on the signal surface of the disk 10.
- a focus drive signal SFD for driving the optical pickup 25 is generated and supplied to an actuator (not shown) of the optical pickup 25. Further, the servo control unit 27 drives the objective lens of the optical pickup 25 based on the supplied tracking error signal STE so that the irradiation position of the laser beam is located at the center of the desired track.
- a tracking drive signal STD is generated and supplied to the actuator. Further, since the tracking service range of the optical pickup 25 is limited, the servo control unit 27 sets the optical pickup 25 to the disk 10 so that the signal recording or reading position is within the tracking servo range.
- the servo control unit 27 performs the control based on the servo control signal CS from the control unit 40. Controls the operation of the For example, when the disk 10 is mounted, the servo control unit 27 performs a focus search operation based on the servo control signal CS from the control unit 40, and the focal position of the laser beam is set on the signal surface of the disk 10. The focus servo operation is started by detecting the position of the objective lens at the position.
- the servo control unit 27 when moving the signal reading position, temporarily suspends the tracking servo operation based on the servo control signal CS from the control unit 40 and performs a track jump to read the signal. Move the position quickly in the radial direction.
- the reproduction signal processing unit 30 performs demodulation processing, ding-leave processing, and error correction processing of the reproduction signal RDa using the clock signal CLK, and supplies the processed signal RDb to the output processing unit 31.
- a signal indicating a signal RDb address position obtained by reading a signal from a predetermined area of the disk 10 is supplied to the control unit 40.
- the output processing unit 31 performs a decoding process when the supplied signal RDb is a coded signal of video or audio. Furthermore, the output processing section 3 1, c and outputs the signal obtained by the this performing a decoding process as the output signal RDc the predetermined output Fomatsuto Also, when the signal RDb is not a signal coded, the output processing unit 31 outputs the signal supplied from the reproduction signal processing unit 30 as an output signal RDc of a predetermined output format. Further, when the supplied signal is a data signal of computer software or the like, the output processing unit 31 outputs the signal supplied from the reproduction signal processing unit 30 as it is.
- the input processing unit 32 When the input signal WDa for video and audio is supplied, the input processing unit 32 performs an encoding process to reduce the signal amount of the input signal WDa, and uses the signal after the encoding process as a signal WDb. This is supplied to the recording signal processing unit 33. If the signal amount is not reduced, the input processing unit 32 supplies the input signal WDa to the recording signal processing unit 33 as the signal WDb. When the input signal WDa is not a signal of a predetermined format, the input processing unit 32 performs format conversion of the input signal WDa, and supplies the converted signal to the recording signal processing unit 33 as a signal WDb. Further, when a data signal such as a computer software is supplied as an input signal WDa, the input processing unit 32 supplies this data signal to the recording signal processing unit 33 as a signal WDb.
- a data signal such as a computer software
- the recording signal processor 33 performs modulation processing of the signal WDb supplied from the input processor 32, Performs g- interleave processing, calculation and addition of an error correction code, and generates a recording signal ws.
- the recording signal processing unit 33 When a test signal WDc for power calibration is supplied from the control unit 40, the recording signal processing unit 33 generates a recording signal WS based on the test signal WDc and drives the laser. Supply to parts 34.
- the discrimination signal generator 28 generates a discrimination signal LM that enables discrimination as to whether or not a signal has been written with an appropriate laser output based on the supplied read signal Sr. For example, when a predetermined pattern signal is recorded by varying the output of the laser light, and the recorded pattern signal is reproduced, the maximum level and the minimum level of the signal obtained at the time of reproduction fluctuate according to the output of the laser light. . For this reason, the signal level of the read signal Sr is detected, and a signal indicating this signal level is supplied to the control unit 40 as a determination signal LM.
- the laser drive unit 34 controls the output of the laser light applied to the disk 10 by generating a laser drive signal SLD and supplying it to the laser light output element of the optical pickup 25.
- the laser driving unit 34 outputs, for example, the output of the laser beam based on the laser output set value CL supplied from the control unit 40 in accordance with the recording signal WS supplied from the recording signal processing unit 33.
- a laser drive signal S LD is generated so as to perform switching.
- the temperature sensor 36 measures the temperature of the disk 10 or the space near the disk 10 and supplies a sensor signal TSa indicating the measurement result to the control unit 40.
- Temperature sensors 37 are
- the temperature of the laser light output element is measured, and a sensor signal T Sb indicating the measurement result is supplied to the control unit 40.
- the motor drive unit 35 generates a spindle drive signal SSD based on the motor control signal MC supplied from the control unit 40 and supplies the spindle drive signal SSD to the spindle motor 22.
- a user interface 41 is connected to the control unit 40.
- the user interface 41 generates a control signal PS according to a user operation and supplies the control signal PS to the control unit 40.
- a remote control signal corresponding to a user operation is received and supplied to the control unit 40 as a control signal PS.
- the user interface 41 receives a signal for controlling the operation of the optical recording device from an external device, and outputs the control signal PS as a control signal PS. Supply to 40.
- the control unit 40 controls the operation of each unit based on the control signal PS supplied from the user interface 41, and sets the operation of the optical recording device to an operation mode according to a user operation or the like. Further, the control section 40 generates a laser output set value CL for setting the output of the laser light according to the operation mode, and supplies the generated laser output set value CL to the laser drive section 34.
- the control unit 40 In the power calibration process, the control unit 40 generates a laser output set value CL so as to continuously or stepwise change the output of the laser beam, and supplies the laser output set value CL to the laser driving unit 34.
- the test signal WDc is supplied to the recording signal processing unit 33. Test writing is performed in the test writing area A and the outer peripheral area F. Further, based on the discrimination signal LM supplied from the discrimination signal generation unit 28 when the test signal WDc of the test writing area A is reproduced, the control unit 40 outputs the laser light output on the innermost peripheral side.
- the optimum laser output setting value C LA is determined, and based on the determination signal LM supplied from the determination signal generator 28 when the test signal WD c in the outer peripheral area F is reproduced, the laser beam is generated at the outermost peripheral side. Determine the laser output set value CLF that gives the optimum output.
- control unit 40 uses identification information for enabling identification of whether or not the disc is already used, the determined laser output set value, and various information at the time of performing the power calibration process.
- the generated power calibration information is provided on a disk or an optical recording device.
- device identification information and power calibration information which are device-specific identification information assigned to the optical recording device, are recorded in a predetermined area of the disk 10.
- the recording medium identification information which is identification information unique to the disk allocated to the disk, and the power calibration information are stored in the memory 42 in association with each other.
- the device identification information is composed of, for example, an ID for identifying a device development maker, a device model name, a device serial number, and the like.
- the recording medium identification information is composed of, for example, an ID for identifying a disc development maker, a disc product name, a disc serial number, and the like. If there is little variation among the production lots of disks, the production port number of the disks may be used.
- the power calibration information is information for determining the change over time in the laser output set value and the characteristics of the laser light output element (for example, the laser light output element when the power calibration processing is performed). ⁇ Information on the usage environment of the laser light output device (eg, the temperature of the laser light output device), intrinsic characteristics of the laser light output device, etc. And the like. Further, information on the characteristics of the disc can be used.
- the device identification information is, for example, provided with a non-volatile memory in the control unit 40, and is stored in advance in this non-volatile memory so that general users cannot rewrite it.
- the optical pickup is replaced in the above manner, by updating the device identification information stored in the nonvolatile memory, the power calibration information can always be kept in a correct state.
- the recording medium identification information may be any position as long as it can be read by the optical recording device, and can be recorded in the innermost or outermost area of the disk, a lead-in area, a program area, or the like. Also, if recording is performed near the laser beam irradiation position at the optical pickup position which is set first when the optical recording apparatus starts operation, the recording medium identification information can be read out without moving the optical pickup 25 in the disk radial direction. This makes it possible to quickly identify whether a disc is already used.
- the disc 10 in which the memory is embedded is used as an optical recording medium, or the disc 10 is housed in a cartridge provided with the memory to constitute the optical recording medium, the recording medium identification information is stored in this memory. It may be recorded.
- a wireless transmission / reception circuit is provided together with the memory, information can be recorded and reproduced in a non-contact manner, and the optical recording medium can be simply mounted on the optical recording device without rotating the disk 10. It is possible to identify whether the disc is already used.
- the control unit 40 determines the necessity of the power calibration process based on the identification information and the power calibration information provided in the memory 42 or the disk 10, and when it determines that the power calibration process is necessary, the power calibration is performed. Execute the translation process. At the time of signal recording, the laser output setting values CLA, CL of the power calibration information provided in the memory 42 or the disk 10 or the power calibration information generated by executing the power calibration processing. Set the laser light output based on F. The control unit 40 generates a servo control signal CS to control the operation of the servo control unit 27.
- the optical recording device 2 or the disc 10 identifies whether or not the disc 10 has already been used. Performs the brazing process and determines the laser output set value at which the output of the laser beam becomes optimal. After that, the recording operation is performed using the determined laser output set value. If there is a record of use, it is assumed that the laser output set value that has already been set is to be used, and the power calibration process is omitted and the recording operation is started.
- the output characteristics of the laser light output element change depending on, for example, the use temperature and the use integration time. For this reason, the information validity condition is set so that the change of the output of the laser beam is within a desired range with respect to the use temperature, the use cumulative time, etc., and the power calibration information satisfies the information use condition. If not, the laser output setting value included in the power calibration information is invalidated, and the power calibration process is performed again to update the laser output setting value.
- FIG. 3 is a flowchart showing a first mode of operation in the optical recording device.
- identification information and power calibration information for identifying the use record are recorded on the disc 10
- the optical recording device utilizes the information recorded on the disc 10. This is for setting the output of the laser beam.
- step ST1 the control unit 40 of the optical recording device identifies whether or not device identification information is recorded in a predetermined area of the disk 10.
- the process proceeds to step ST2 because no device identification information is recorded.
- step ST 2 a power calibration process is performed to set a laser output set value at which the output of the laser beam becomes optimum, and the laser output set value is stored in the memory 42.
- control unit 40 controls the operations of the servo control unit 27, the recording signal processing unit 33, the laser drive unit 34, the motor drive unit 35, and the like to obtain a desired speed.
- the test writing area A of the disc 10 which is rotated Record the signal WDc. Further, when recording the test signal WDc, the output of the laser beam is varied by continuously or stepwise changing the laser output set value.
- control unit 40 performs a control process of reproducing the recorded test signal WDc, and performs a control process when the best signal is obtained based on the discrimination signal LM supplied from the discrimination signal generation unit 28.
- the optimum laser output set value C LA on the inner peripheral side is stored in the memory 42.
- the optical pickup 25 When the setting operation of the laser output set value for the inner peripheral side is completed, the optical pickup 25 is moved to the outer peripheral side, and recording and reproduction of the test signal WDc are performed as in the case of the inner peripheral side.
- the laser output set value when the best signal is obtained based on the discrimination signal LM is set as the optimum laser output set value CLF on the outer peripheral side.
- the optimum laser output set value CLF on the outer peripheral side is stored in the memory 42.
- step ST3 the laser output set value CL at each position in the radial direction of the disc 10 is obtained from the laser output set value CLA on the outer circumference side and the laser output set value CLF on the outer circumference stored in the memory 42. calculate. If the calculation of the laser output set value CL at each position is performed based on a calculation formula set in accordance with the recording characteristics of the disk 10, the optimum laser output set value CL can be calculated. The operation of determining the recording characteristics of the disk 10 can be performed based on a change in the recording characteristics by recording a test signal in the test writing area A. Further, it is also possible to determine the recording characteristics by reading data set on each disk manufacturer and recorded on the disk.
- step ST4 the operations of the servo control unit 27, the recording signal processing unit 33, the laser drive unit 34, the motor drive unit 35, and the like are controlled, and the device identification information and the power calibration information are transferred to the disk 10. To be recorded. By recording the device identification information on the disk 10 in this way, it is possible to correctly identify whether or not the disk is already used.
- the power calibration information is generated by using various information at the time of performing the power calibration process as described above. For example, the date and time at which the power calibration process was performed, the power calibration, and the like. Perform the translation process Integrated time of the laser light output element, the temperature TMa of the disk 10 or the vicinity of the disk 10 or the temperature TMb of the optical pickup 25, the inner laser output set value CLA and the outer laser output set value Information on CLF and laser light output elements shall be used.
- the device identification information and the power calibration information are recorded in a predetermined area of the disc 10, for example, a test writing area A and an outer peripheral area F.
- the recording area is not limited to these areas.
- a predetermined area may be assigned to a program area in advance, and recording may be performed in this area. If the recording area is determined in this way, the device identification information and the power calibration information can be quickly read.
- the recording position of the device identification information and the power calibration information can be managed, it is needless to say that the recording may be performed at any position in the free space on the disk.
- step ST5 the laser output set value CL at each position in the disk radial direction calculated from the inner laser output value C LA and the outer laser output set value C LF is determined according to the signal recording position.
- the signal is supplied to the drive unit 34 and a signal is recorded in the program area D with the laser light output based on the laser output set value CL.
- the recording position of the signal can be easily determined by reading the address information provided on the disk 10 by wobbled pits or the like.
- the laser output set value CL corresponding to the radial position of the optical pickup 25 may be supplied to the laser drive unit 34.
- the control unit 40 captures the laser output set value CL based on the sensor signals T Sa and T Sb. By correcting the laser output set value CL in this way, the signal recording operation can be continuously performed with the optimum laser light output.
- step ST4 the process proceeds from step ST1 to step ST6, where the device identification information and the power calibration information recorded on the disk 10 are read out, and the process proceeds to step ST7.
- step ST7 it is determined whether or not the read device identification information matches the device identification information of the optical recording device using the disc 10.
- the process proceeds to step ST8 because the device identification information matches.
- the device identification information assigned to the other optical recording device is recorded. For this reason, the read device identification information and the device identification information of the optical recording device do not match, and the process proceeds from step ST7 to step ST2, where the power calibration process is performed again, and the optical recording using the disc 10 is performed.
- the laser output set value according to the device is determined.
- step ST8 it is determined whether or not the power calibration information satisfies the information valid condition.
- the process proceeds to step ST9, and when not satisfied, the process returns to step ST2.
- the information validity condition is set such that the output change of the laser beam is within a desired range as described above.
- the information valid conditions include, for example, the number of days elapsed from the day when the power calibration process was performed and the power calibration process performed in order to keep the output change of the laser beam due to the deterioration of the laser optical element within a desired range.
- the conditions are set for the accumulated time difference between the accumulated use time of the laser light output element and the current accumulated use time.
- conditions are set, for example, for a temperature difference between the temperature at the time of performing the park calibration process and the current temperature.
- the information on temperature etc. in 16 is included in the power calibration information.
- the process proceeds to step ST2, where the laser output setting value is reset, and each unit is controlled so that signal recording is performed.
- the elapsed days and the accumulated time difference do not exceed a predetermined value, and the temperature difference is within a predetermined range.
- the operating temperature does not exceed a threshold value, the information validity condition is satisfied. And proceeds to step ST9.
- step ST8 when the information validity condition is not satisfied, the calibration processing is automatically performed, so that the recording operation is performed with the laser light output being in an optimum state.
- the calibration processing is performed. Is done automatically. Therefore, it is possible to prevent signal recording on the disk 10 from being performed in a state where the output of the laser beam is small, and record the signal with an optimum output.
- step ST8 when using a disc with a high margin of change in laser light output during signal recording, or when using a laser light output element with small fluctuations in laser light output, the power calibration with time and temperature changes. In such a case, the processing in step ST8 may be omitted since the signal can be recorded well without performing the processing.
- step ST9 the inner laser output set value CLA and the outer laser output set value CLF recorded on the disk 10 in step ST4 described above are read, and stored in the memory 42 to store in step ST10. Proceed to.
- step ST10 the inner laser output value CLA and the outer laser output value CLF stored in the memory 42 are stored in the radial direction of the disk 10 in the same manner as in step ST3. Calculate the laser output set value CL at the position. Then, proceed to step ST5, and set the laser output set value CL according to the signal recording position to the laser. The signal is supplied to the drive unit 34 to record the signal.
- the control unit 40 identifies that the disk 10 has not been used. After performing the power calibration process, the signal is recorded. If the device identification information matches the device identification information of the optical recording device, it is determined that the disk 10 has been used, and the laser output setting of the power calibration information recorded on the disk 10 is performed. Record the signal using the value.
- the disk 10 is mounted on the optical recording device 20 and the power calibration process is performed in advance, the information recorded on the disk will be used when the disk is subsequently used.
- the recording operation starts immediately, and the waiting time until signal recording starts can be greatly reduced.
- the waiting time can be shortened, there is no need to provide a buffer memory or the like for holding a signal supplied during the power calibration process, and the optical recording apparatus can be configured at low cost.
- the characteristics of the laser light output element change with the use of the optical recording device, or when the laser light output change may become larger than a desired range when used in an environment where the operating temperature is different or the like. Since the power calibration process is performed again and the laser output set value is optimized, the signal can always be recorded in an optimal state.
- the identification information and the power calibration information are recorded on the disk 10.
- the same operation is performed when the information is stored in the optical recording device 20. Can be.
- a case where such information is stored in the optical recording device 20 will be described with reference to the flowchart of FIG.
- the control unit 40 identifies whether or not the recording medium identification information is recorded in the memory 42 of the optical recording device 20 in step ST21.
- the process proceeds to step ST22 because the recording medium identification information of this disc is not stored.
- step ST22 a power calibration process is performed in the same manner as in step ST2 described above, and a power calibration having an optimized laser output set value is performed. Generate session information.
- This power calibration information is configured in the same manner as in step ST4 described above.
- step ST23 the recording medium identification information and the power calibration information are stored in the memory 42 in association with each other. By using the recording medium identification information in this way, it is possible to correctly identify whether or not the disc has been used.
- step ST24 the laser output set value CL at each position in the radial direction of the disk 10 is calculated from the inner laser output set value CLA and the outer laser output set value CLF.
- step ST25 similarly to step ST5, the laser output set value CL at each position in the disk radial direction calculated from the inner laser output value CLA and the outer laser output set value CLF is signaled. The signal is supplied to the laser drive unit 34 in accordance with the recording position of, and the signal is recorded in the program area D.
- step ST25 determination of the signal recording position and the like and correction of the laser output set value CL can be performed in the same manner as in step ST5.
- step ST23 If the disc 10 has already been used, the recording medium identification information and the power calibration information are recorded in the memory 42 by the above-described step ST23. Therefore, the process proceeds from step ST21 to step ST26.
- step ST26 the recording medium identification information recorded on the disk 10 is read, and the flow advances to step ST27.
- step ST27 it is determined whether or not the recording medium identification information stored in the memory 42 of the optical recording device 20 matches the recording medium identification information read from the disk.
- the process proceeds to step ST28. If the disc has not been used, the recording medium identification information of this disc is not stored in the memory 42, so that the process proceeds to step ST22 to perform power calibration processing. After that, a process of storing the recording medium identification information and the power calibration information in association with each other in the memory 42, calculating a laser output set value CL at each position, and recording a signal with the calculated laser output set value CL are performed. .
- step ST28 the power calibration information stored in association with the recording medium identification information determined to match in step ST27 is read out. 2003/010654 i?
- step ST29 it is determined whether or not the power calibration information satisfies the information validity condition as in step ST8 described above.
- the process proceeds to step ST30, and when not satisfied, the process returns to step ST22. Note that the processing in step ST29 can be omitted as in step ST8.
- step ST30 the laser output set value CLA on the inner peripheral side and the laser output set value CLF on the outer peripheral side are extracted from the read power calibration information, and the process proceeds to step ST24.
- the laser output set value CL at each position in the radial direction of the disk 10 is calculated from the output set value CLA and the laser output set value C LF on the outer peripheral side.
- step ST25 signal recording is performed with a laser beam output based on the calculated laser output set value CL.
- the recording medium identification information when the recording medium identification information is not recorded in the memory 42 of the optical recording device 20 or when the stored recording medium identification information is different from the recording medium identification information recorded on the disc, it is used. Identify that there is no record and perform power calibration processing before recording the signal.
- the stored recording medium identification information matches the recording medium identification information recorded on the disc, it is determined that the recording medium has been used, and the memory 42 is associated with the matching recording medium identification information.
- the signal is recorded by using the laser output set values CLA and CLF of the power calibration information stored in the memory.
- the disc 10 is mounted on the optical recording device 20 and the power calibration process is performed in advance, the information stored in the memory is used when the disc is used thereafter. Since the recording operation starts immediately, the waiting time until the start of signal recording can be greatly reduced. In addition, since the waiting time can be shortened, there is no need to provide a buffer memory or the like for holding signals supplied during the power calibration process, and the optical recording apparatus can be configured at low cost. Furthermore, when the characteristics of the laser light output element change with the use of the optical recording device, or when the laser light output is likely to be larger than a desired range when used in an environment where the operating temperature is different or the like. The power calibration process is performed again to optimize the laser output setting Since ⁇ is performed, the signal can always be recorded in an optimal state.
- an optical recording medium may be a card-type optical recording medium, for example, as long as recording is performed using laser light.
- Industrial applicability is described.
- the present invention is suitable for an optical recording apparatus using a removable medium because the output of a laser beam can be quickly set to an optimum state by using already generated power calibration information.
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/493,258 US7023772B2 (en) | 2002-08-23 | 2003-08-22 | Laser power setting method and optical recording device |
EP03792809A EP1533795A4 (en) | 2002-08-23 | 2003-08-22 | Laser output method and optical recording device |
JP2004530607A JPWO2004019324A1 (ja) | 2002-08-23 | 2003-08-22 | レーザ出力設定方法および光記録装置 |
Applications Claiming Priority (2)
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JP2002-243826 | 2002-08-23 | ||
JP2002243826 | 2002-08-23 |
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WO2004019324A1 true WO2004019324A1 (ja) | 2004-03-04 |
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PCT/JP2003/010654 WO2004019324A1 (ja) | 2002-08-23 | 2003-08-22 | レーザ出力設定方法および光記録装置 |
Country Status (5)
Country | Link |
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US (1) | US7023772B2 (ja) |
EP (1) | EP1533795A4 (ja) |
JP (1) | JPWO2004019324A1 (ja) |
KR (1) | KR20050040818A (ja) |
WO (1) | WO2004019324A1 (ja) |
Cited By (1)
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JPWO2007026543A1 (ja) * | 2005-08-30 | 2009-03-05 | パイオニア株式会社 | 情報記録装置及び方法、並びにコンピュータプログラム |
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TWI256624B (en) * | 2004-01-20 | 2006-06-11 | Lite On It Corp | Method for storing calibration data on circuit board, and compact disk drive implementing the same |
TWI297150B (en) * | 2004-05-12 | 2008-05-21 | Lite On It Corp | The method of storing optical characteristics calibration data into pcb and apparatus for the same |
KR20100017674A (ko) * | 2007-05-10 | 2010-02-16 | 코닌클리케 필립스 일렉트로닉스 엔.브이. | 광 드라이브의 디스크 기동 시간 |
WO2010083109A1 (en) | 2009-01-14 | 2010-07-22 | Marvell World Trade Ltd. | Method and apparatus for determining a location of a defect on a storage medium |
JP2011258269A (ja) * | 2010-06-09 | 2011-12-22 | Sony Corp | 記録装置、記録方法、プログラム |
WO2018156143A1 (en) | 2017-02-24 | 2018-08-30 | Hewlett-Packard Development Company, L.P. | Three-dimensional (3d) printing |
US11577316B2 (en) | 2017-02-24 | 2023-02-14 | Hewlett-Packard Development Company, L.P. | Three-dimensional printing |
US10461851B1 (en) | 2018-03-30 | 2019-10-29 | Facebook, Inc. | Predicting optical transceiver failure |
US10425156B1 (en) * | 2018-03-30 | 2019-09-24 | Facebook, Inc. | Dynamically determining optical transceiver expected life |
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2003
- 2003-08-22 JP JP2004530607A patent/JPWO2004019324A1/ja active Pending
- 2003-08-22 US US10/493,258 patent/US7023772B2/en not_active Expired - Fee Related
- 2003-08-22 EP EP03792809A patent/EP1533795A4/en not_active Withdrawn
- 2003-08-22 KR KR1020047005874A patent/KR20050040818A/ko not_active Application Discontinuation
- 2003-08-22 WO PCT/JP2003/010654 patent/WO2004019324A1/ja active Application Filing
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Also Published As
Publication number | Publication date |
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KR20050040818A (ko) | 2005-05-03 |
JPWO2004019324A1 (ja) | 2005-12-15 |
US20050007908A1 (en) | 2005-01-13 |
EP1533795A4 (en) | 2008-10-22 |
EP1533795A1 (en) | 2005-05-25 |
US7023772B2 (en) | 2006-04-04 |
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