JP2007149337A - Optical disk recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform recording to an optical disk of inferior quality on suitable recording conditions. <P>SOLUTION: First test writing processing is carried out for checking disk quality, and when the disk quality is bad, a test writing parameter is increased and sequence processing is changed to carry out second test writing processing. The 2nd test writing processing is attained using not only one partition of a PCA but also any two or more partitions of the PCA. Thus, even a bad quality disk can be recorded and played back with writing accuracy of laser increased. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a recordable / reproducing apparatus for a recordable optical disc, and more particularly to a test writing process for laser power necessary for writing.

  Conventionally, when recording on a recordable optical disc such as a CD-R, trial writing is performed on a PCA (Power Calibration Area) which is a test recording area provided on the optical disc, and a recording process is performed after obtaining suitable recording conditions. (For example, refer nonpatent literature 1). This PCA has a plurality of partitions, but since each partition cannot be reused once it is used, the number of times that a suitable recording condition can be obtained before the recording process, that is, a suitable recording condition is detected. In addition, the number of times that recording was possible was limited. For this reason, the number of times that the recording condition can be detected is reduced by setting one partition to be used for detecting the recording condition to one partition. In addition, by recording suitable recording conditions on the disc in advance, the recording condition detection process has been omitted.

  Such a recording condition detection method has also been implemented when recording processing is performed on CD-RW, DVD-R / RW, and DVD + R / RW discs. The DVD + R / RW disc has a configuration having test recording areas (InnerDriveArea, OuterDriveArea) on both the inner and outer peripheral sides of the disc from the viewpoint of increasing the number of partitions.

Hiroshi Shimizu “CD-R / CD-RW Technology” Trikeps Publishing, August 2001, P17-30, P67-68, P78-79

  In a recording process for a recordable optical disk, a default recording condition stored in the optical disk apparatus or recorded in advance on each optical disk (an apparatus having standard characteristics for a disk having standard characteristics) Even when the recording process is performed in accordance with the recording conditions when recording with (2), there is a problem that appropriate data recording cannot be performed if the quality of the recording target disk is poor. The first problem is to detect an appropriate recording condition for such a poor quality disc.

  In addition, in the conventional recording condition detection method, only one partition of PCA is used at the time of one trial writing even for a low-quality disc, so that it is possible to obtain a suitable recording condition in consideration of various recording parameters. could not. It is the second problem of the present application to detect a suitable recording condition for a disk of poor quality that could not be detected by a conventional method.

  The first problem is that, if the disc quality is lower than a certain reference value according to the result obtained by the first trial writing process for confirming the quality of the disc, the second parameter is increased. By performing trial writing, the laser writing accuracy can be increased.

  The second problem is that the laser writing accuracy can be increased by using not only one partition of PCA but also a plurality of partitions of PCA. Further, when the user selects the “DiscOnce” mode, all partitions of the PCA can be used in trial writing.

  As described above, according to the present invention, the first trial writing process for checking the quality of the disc is performed, and the second trial writing is performed when the disc quality is poor. In the second test writing, the parameters of the test writing are increased, the accuracy of the laser writing condition is increased, and recording / reproduction can be performed even on a disc having a large characteristic variation.

  The present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram showing a first embodiment of an optical disk apparatus according to the present invention. Here, 1 is an optical disk, 2 is a spindle motor, 3 is an optical head, 4 is a reproduction circuit, 5 is a laser drive circuit, 6 is a test writing processing circuit, 7 is a demodulation circuit, 8 is a modulation circuit, 9 is a control circuit, Reference numeral 10 denotes a disk determination unit, 11 denotes a trial writing parameter control unit, 12 denotes a host computer, 13 denotes a memory, and 14 denotes a writing method determination unit.

  An optical disk 1 is rotated by a spindle motor 2, and an optical head 3 is a semiconductor laser that emits laser light for recording and reproducing information, and an optical system that forms light from the semiconductor laser as a light spot on the disk surface. And a photodetector for performing light spot control such as information reproduction and auto-focusing and track tracking using reflected light from the optical disk 1, and recording information on the optical disk 1. Play the above information. The optical disk apparatus is connected to a host computer (hereinafter referred to as the host 12) such as a personal computer or workstation, and records and reproduces information and instructions from the host 12 through a control circuit 9 including a microcomputer. And perform a seek operation.

  The reproduction process is performed by giving a reproduction start instruction from the host 12 to the control circuit 9. The reproduction signal is received through a reproduction circuit 4 and a demodulation circuit 7 for receiving data from the optical head 3 and extracting data on the disk. During reproduction, the laser of the optical head 3 emits low output DC power.

  The data recording process is performed by giving a recording start instruction from the host 12 to the control circuit 9. Data for recording input from the host 12 passes through the modulation circuit 8 and the laser drive circuit 5 from the control circuit 9, and the information in the memory 14 stores the suitable laser power obtained by the trial writing process before the recording process. Then, a recording signal is written on the optical disk 1 by the optical head 3. At the time of recording, the laser of the optical head 3 emits a pulse of laser light at a high output and records information on a disk.

  The trial writing recording process is performed by instructing the control circuit 9 to start trial writing recording from the host 12. A first test writing process is performed, and the disc quality determination unit 10 determines the quality of the disc. The first trial writing process is a process for determining the disk quality, and the application range of the laser power for writing to the disk, which is predetermined for each optical disk device, is stored in the memory 13. It is determined whether or not the result of the first test writing process is out of this application range.

  The first trial writing process is a process that can clearly understand the quality of the disc. For example, a method of checking symmetry by a conventional method of changing only the power may be used, or a method of generating a specific NRZI pattern and counting the number of marks and spaces in the pattern may be used.

  After determining the disc quality, if the disc quality is within the reference value, a suitable recording power is calculated. In order to calculate a suitable power, a second test writing process may be performed.

  If the disc quality does not satisfy the reference value after the disc quality is determined, the test writing parameter control unit 11 not only optimizes the laser power but also the laser emission power that varies depending on the emission timing adjustment, pulse width, and temperature. The second test writing process using a larger number of parameters than usual is performed by the test writing processing circuit 6 and the laser driving circuit 5 is operated. After performing the test writing, the optical head 3 detects light using the reflected light from the optical disk 1 in the test writing process, and is input to the control circuit 9 through the reproducing circuit 4 and the test writing processing circuit 6. Laser writing conditions are calculated. The reproduction information obtained from the trial writing and suitable laser writing conditions are stored in the memory 13. The test writing information obtained here is used during the data recording process as described above.

  Since the number of parameters is increased in the second trial writing, a single partition in the PCA area is not sufficient by the trial writing operation, and therefore a plurality of partitions are used.

  A suitable recording condition detection method in the first embodiment described above will be described in detail with reference to the flowchart of FIG. FIG. 2 shows a process of performing the first test writing for checking the disc quality and performing the second test writing based on the disc quality result. When the user selects to write data to the disc after loading the disc into the CD-R drive, the first trial writing process is performed to check the disc quality. When the disc quality satisfies a predetermined reference value, a suitable laser power is calculated.

  On the other hand, if the disc quality does not satisfy a predetermined reference value, the second test writing process is performed. With the second trial writing process, not only optimization of laser power but also adjustment of emission timing, pulse width, correction of deviation of laser emission power that varies with temperature, etc., increased parameters to be given to the laser driver, suitable laser writing Realize. If it is within the set allowable value in advance, the write condition is calculated. If the tolerance is not met, it may be caused by dust, dust, scratches, etc. on the disk, so the PCA partition in another area is moved and the test writing process is performed again. In this case, the trial writing may be performed by changing the test writing conditions, or the test writing may be performed under the same conditions. When the set number of reprocessing is exceeded, it is determined as abnormal.

  As a method for acquiring parameters to be given to the laser driver, a special pattern mark is recorded and a pulse with the smallest reproduction jitter is determined. Or, it is possible that the suitable power already recorded in the PMA (ProgrammeMareaArea) etc. on the disc is greatly deviated from the ambient temperature, etc. A pattern is written, and an appropriate parameter value to be given to the laser is obtained from the result. Or, in the CD-R, since nine types of recording pits from 3T pits to 11T pits need to be accurately formed, the best recording strategy is set so that good pits are formed for each waveform. Ask. Alternatively, the phase shift between the data edge and the clock edge is detected while changing the recording power, and the jitter is measured equivalently to obtain a suitable recording condition.

  As mentioned above, the test area must be increased when the parameters are increased. Therefore, not only one partition of the PCA area but also a plurality of partitions are used in one trial writing. Since the PCA area is divided into 100 partitions, 2 or more and 100 or less partitions can be used in one trial writing.

  A second embodiment will be described using the flowchart of FIG. Since the configuration of the optical disk apparatus of the present embodiment is the same as that of FIG. 1, the description thereof is omitted. The present embodiment is an embodiment characterized in that the second test writing method is changed depending on whether the recording method on the disc is “DiscatOnce” or another recording method.

  Here, “DiscOnce” is a recording method in which data is written only once on the disc, so there is no particular problem even if the entire PCA area is used. On the other hand, since writing methods other than DisccOnce (TrackatOnce, SessionatOnce, PacketWrite, etc.) may be additionally written, if all partitions are used, there is a problem that trial writing cannot be performed at the time of additional writing. Therefore, in the case of a writing method other than DiscOnce, it is necessary to limit the area used in one trial writing, and the number of trial writing parameters and the number of processes are reduced.

  The number of rewriting processes and the number of parameters of the trial writing process are determined by the writing method determining unit 14 as to whether the user's instruction to write to the disk input from the host 12 is “Discatonce”. When the user selects “Discatance” from the host 12, the writing method determination unit 14 determines “Discatonce”, and the reprocessing count and the number of parameters can be set up to the maximum number of partitions in the PCA area. In the case of a method other than “Discatonce”, the number of test writings depends on the number of times of additional writing to the disc. The number of reprocessing and the number of parameters may be changed for each writing method, such as TrackOnce, SessionatOnce, and PacketWrite.

  In the case of a CD-R disc, when the data writing method is “DiscOnce” and the writing data is one track, PMA may be used as the test writing area. In the case of a CD-R, track information is not determined until data recording is completed. If there are a plurality of tracks, the track information is temporarily recorded in the PMA until TOC (Table Of Contents) is written in the lead-in area. However, in the case of 1-track recording, since PMA is not used, there is no inconvenience even if PMA is used for test writing.

  As a point of caution when using PMA for test writing, the outer periphery of the PMA is in contact with the data area, so it is necessary to test-write so as not to affect the ATIP (AbsoluteTimeInPregroove) which is address information of this area.

  A third embodiment will be described using the flowchart of FIG. Since the configuration of the optical disk apparatus of the present embodiment is the same as that of FIG. 1, the description thereof is omitted. This embodiment is an embodiment characterized in that the time used for the second test writing can be limited.

  In FIG. 4, after the first test writing, a message is output when the disc quality is poor, and the user selects the second test writing time.

  After the first trial writing to check the disc quality, if the disc quality does not meet the standard value, “Because the disc quality is defective, the laser adjustment (trial writing) takes time. "Do you want to do trial writing?" Is output to a PC monitor or the like. When “perform laser adjustment (trial writing)” is selected, a time setting screen is output thereafter, and the user selects this. According to the time setting set by the user, the number of parameters for trial writing, the number of times of reprocessing, and the like are calculated to realize suitable laser writing conditions.

  A fourth embodiment will be described using the flowchart of FIG. Since the configuration of the optical disk apparatus of the present embodiment is the same as that of FIG. 1, the description thereof is omitted. In this embodiment, the present invention is applied to a disc having test writing areas on the inner and outer peripheral sides.

  When there is a test writing area on both the inner and outer peripheral sides as in the DVD + R / RW described above, InnerDriveArea and OuterDriveArea can be used for test writing. In the case of such a disc, when performing a quality check on the disc, the test writing process is performed on the outer periphery after the test writing process is performed on the inner periphery, and different sensitivities, etc. are calculated on the inner periphery and the outer periphery. Parameters can be given to the laser driver.

  DVD + R / RW is capable of CLV (Constant Linear Velocity) and CVA (Constant Angular Velocity) recording. In this case, the outer peripheral side area where the linear velocity greatly differs depending on the light amount of the laser beam set by the inner peripheral PCA is accessed. Therefore, in such a case, trial writing is performed on both the outer and inner circumferences so that the light amount setting accuracy of the laser beam is not particularly lowered. In this case, it is possible to use all of the inner disk test zone and inner disk count zone provided in InnerDriveArea, and the outer disk test zone and outer disk count zone provided in OuterDriveArea. Note that it is possible to use the entire PCA area on a DVD-R / RW disc.

  Note that “trial writing process 1 on the inner (outer) circumference” and “trial writing process 2 on the outer (inner) circumference” in FIG. 5 performs the test writing 2 on the outer circumference when the test writing 1 is performed on the inner circumference. When test writing 1 is performed on the outer periphery, it indicates that test writing 2 is performed on the inner periphery. Further, “Test writing process 3 on the inner (outer) circumference” and “Test writing process 4 on the outer (inner) circumference” of FIG. 5 performs the test writing 4 on the outer circumference when the test writing 3 is performed on the inner circumference. When test writing 3 is performed on the outer periphery, it indicates that test writing 4 is performed on the inner periphery.

  As described above, the present invention has been described as an example of recording on CD-R and DVD + R / RW. However, the present invention can be used in any optical recording / reproducing apparatus for recording and reproducing on other optical disks. . For example, a DVD-RAM has a DMA area in the lead-in area and the lead-out area, but in the case of DisccOnce, trial writing using this area is performed, the parameters are increased, and a more suitable value is obtained. To write to.

  In addition, when the information on the download site is downloaded and directly written to the optical disc, the above processing is directly performed so that the information can be reliably written to the disc. This is especially effective when the data is important.

The figure which shows the Example of the optical disk apparatus of a 1st Example. The figure which shows the process sequence in the optical disk apparatus of a 1st Example. The figure which shows the process sequence in the optical disk apparatus of a 2nd Example. The figure which shows the process sequence in the optical disk apparatus of a 3rd Example. The figure which shows the process sequence in the optical disk apparatus of a 4th Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Optical disk, 2 ... Spindle motor, 3 ... Optical head, 4 ... Reproduction circuit, 5 ... Laser drive circuit, 6 ... Trial writing processing circuit, 7 ... Demodulation circuit, 8 ... Modulation circuit, 9 ... Control circuit, 10 ... Disk Quality judging unit 11... Trial writing parameter control unit 12... Host computer 13. Memory 13.

Claims (5)

An optical disc apparatus for recording and reproducing information on an optical information recording medium,
Has the function to define the recording conditions,
Perform the first trial writing process to check the disc quality,
If the disc quality does not meet certain criteria,
An optical disk recording apparatus characterized in that an execution parameter of any one of laser power, light emission timing adjustment, and pulse width is increased to perform a second test writing process. In claim 1, the test area partition of the test writing divided into a plurality provided in the optical information recording medium,
An optical disk recording apparatus, wherein all partitions or a plurality of partitions are used in the first test writing process and the second test writing process. In claim 1,
The optical information recording medium is an optical information recording medium having an inner periphery test area region and an outer periphery test area region,
Performing the first test writing process and the second test writing process in the order of the inner test area area and the outer test area area;
Alternatively, the optical disc recording apparatus is characterized in that the first test writing process and the second test writing process are executed in the order of the outer periphery test area area and the inner periphery test area area. In claim 1, by inputting information to be written only once to the disc,
Increase the number of parameters for driving the laser to irradiate when determining the recording conditions of the second test writing process,
An optical disk recording apparatus characterized in that a plurality of test writing test area areas provided on an optical information recording medium can be used up to all partitions in the second test writing process. In claim 1,
As a result of the first test writing process, when the disc quality does not satisfy a certain standard, a selection unit that outputs a warning and selects the second test writing process;
When the second test writing process is selected, the processing time selecting means for selecting the second test writing process time,
An optical disk recording apparatus characterized in that the processing time selection means changes the number of parameters for driving a laser to be irradiated when the recording condition of the second trial writing process is determined.

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