JP2007035153A - Recording method, optical disk drive, program and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform recording to an optical disk for a short time without deteriorating recording quality. <P>SOLUTION: Defects are simultaneously detected on the basis of reflected light from a recording face during recording (step 411 and 413), and if a defect is detected, the recording is interrupted (step 419) and the size of the defect is measured (step 421). When the size of the defect exceeds a preset size, the recording is restarted from a position where the defect is avoided (step 431 and 432). On the other hand, when the size of the defect is not larger than the preset size, the recording is restarted from the position where the recording is interrupted (step 441). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a recording method, an optical disc device, a program, and a recording medium. More specifically, the present invention relates to a recording method for recording information on an optical disc, an optical disc device suitable for implementing the recording method, a program used in the optical disc device, and the program Relates to a recording medium on which is recorded.

  In recent years, various disk-like media on which information is recorded optically or magnetically have been widely used, and these are generally collectively referred to as optical disks. As the types of optical disks, in addition to music CDs, CD-ROMs, or DVD-ROMs in which information is recorded in advance, a write-once optical disk that can be written only once, and a rewritable optical disk that can be rewritten. There is.

  In recordable optical discs such as write-once optical discs and rewritable optical discs, the recording surface is irradiated with a laser beam focused in a spot shape to form very small marks (record marks), thereby increasing the information density. It is recorded. However, because of the high density, the amount of information lost due to a slight defect on the recording surface is very large. In addition, since the optical disk is an exchange medium, it is often placed in a poor environment, and in addition to innate defects in manufacturing, the occurrence of acquired defects due to dust, dust, oil, scratches, etc. cannot be denied. Therefore, if there is a defective area, information is recorded avoiding that area.

  There are two main methods for avoiding defective areas. There are a method of performing a so-called verify operation for checking whether or not information can be normally read after recording, and a method of grasping a defect area in advance by a defect check before recording by a certify operation or a format operation. In short, there are a method for detecting defects after recording and a method for detecting defects before recording. These two methods are selectively used depending on whether the optical disc is rewritable, the recording format, or the like, and may be used in combination.

  For example, in the case of a DVD-RAM disc, defects detected before information recording are registered in a PDL (Primary Defect List), and a process called slipping is performed in which defective sectors are skipped and recorded and reproduced. Defects detected after recording are registered in an SDL (Secondary Defect List), and a process called replacement for recording / reproducing data in the spare area of each zone is performed.

  However, the method of detecting defects after recording is reliable and reliable, but the time required for recording (hereinafter abbreviated as “recording time”) increases, resulting in a decrease in recording speed. In video recording of a broadcast program, there is a disadvantage that it may be difficult to ensure a minimum recording speed at which no information is lost. In addition, the method for detecting defects before recording has a disadvantage that it cannot cope with defects generated after checking the defects or cannot immediately start recording, although the decrease in recording speed is small.

  Therefore, various methods such as shortening and omission of processing have been proposed (see, for example, Patent Document 1 and Patent Document 2). Japanese Patent Application Laid-Open No. 2004-133867 has disclosed a method of minimizing the processing time before recording by considering that it takes time to perform certification before recording, and inspecting a small area of a predetermined track prior to recording. . Patent Document 2 discloses a method of shortening the processing time before recording by performing defect inspection separately into high-speed rough inspection and accurate fine inspection.

  However, the method disclosed in Patent Document 1 is basically the same as the method of checking defects by repeating recording / reproduction during recording, and the recording speed may be significantly reduced. Also, with the method disclosed in Patent Document 2, the processing time before the start of recording may not be shortened to the required level.

JP 2000-29883 A JP 2003-196828 A

  The present invention has been made under such circumstances, and a first object thereof is to provide a recording method capable of performing recording on an optical disc in a short time without deteriorating the recording quality.

  A second object of the present invention is to provide an optical disc apparatus capable of performing recording on an optical disc in a short time without deteriorating recording quality.

  A third object of the present invention is executed by a computer for controlling an optical disc apparatus, and a program capable of performing recording on an optical disc in a short time without reducing recording quality and the program are recorded. It is to provide a recording medium.

  The invention according to claim 1 is a recording method for recording information on an optical disc having a recording surface on which spiral or concentric tracks are formed, and the track is recorded on the basis of reflected light from the recording surface during recording. Determining whether or not there is a defect; if there is a defect as a result of the determination, temporarily interrupting recording and detecting the size of the defect; and the size of the detected defect Is a recording method including: a step of resuming recording from a position where recording was interrupted when the value is equal to or less than a preset upper limit value.

  According to this, when recording information on an optical disc having a recording surface on which spiral or concentric tracks are formed, whether or not the track is defective based on the reflected light from the recording surface during recording. In the case where there is a defect as a result of the determination, the recording is temporarily interrupted, and the size of the defect is detected. When the size of the detected defect is equal to or smaller than a preset upper limit value, the recording is resumed from the position where the recording was interrupted. That is, even if there is a defect on the track, for example, if it is clear that correction is possible by error correction processing at the time of reproduction, recording is continued without performing replacement processing. Therefore, recording on the optical disc can be performed in a short time without deteriorating the recording quality.

  In this case, as in the recording method according to claim 2, when the size of the detected defect exceeds the upper limit value, the method further includes a step of restarting recording from a position where the defect is avoided. It can be.

  In this case, it is possible to further include a step of recording dummy data in an unrecorded area generated by avoiding the defect, as in the recording method according to claim 3.

  In each of the recording methods according to the second and third aspects, the recording method according to the fourth aspect may further include a step of recording information on the defect area on the optical disc.

  In each of the recording methods according to claims 1 to 4, in the step of determining whether or not there is the defect as in the recording method according to claim 5, a reduction in the amount of reflected light is preset. It can be determined that there is a defect when it continues for more than an hour.

  6. In each recording method according to claim 1, in the step of detecting the size of the defect as in the recording method according to claim 6, the maximum length of the defect in the spiral direction or circumferential direction of the track. Any one of the maximum length of the defect in the radial direction of the optical disc can be set as the size of the defect.

  6. In each recording method according to claim 1, in the step of detecting the size of the defect as in the recording method according to claim 7, the maximum length of the defect in the spiral direction or circumferential direction of the track. 6. The recording method according to claim 1, wherein a larger one of the defect length and the maximum length of the defect in the radial direction of the optical disc is defined as the defect size.

  In each of the recording methods according to claims 1 to 7, in the step of detecting the size of the defect as in the recording method according to claim 8, a track jump is performed by at least one track in the radial direction of the optical disc. However, the size of the defect can be detected.

  The invention according to claim 9 is an optical disc apparatus capable of recording information on an optical disc having a recording surface on which spiral or concentric tracks are formed, condensing light on the recording surface of the optical disc, An optical pickup device that receives return light from the recording surface and outputs a photoelectric conversion signal; during recording, the presence or absence of a defect is monitored based on the photoelectric conversion signal, and recording is temporarily performed when a defect is detected And a processing device that resumes recording from the position where the recording was interrupted when the size of the defect is equal to or less than a preset upper limit value.

  According to this, when recording information on an optical disk having a recording surface on which spiral or concentric tracks are formed, the processing device monitors the presence or absence of defects based on the photoelectric conversion signal during recording. When a defect is detected, the recording is temporarily interrupted, and when the size of the defect is not more than a preset upper limit value, the recording is resumed from the position where the recording was interrupted. Therefore, even if there is a defect on the track, for example, when it is clear that correction is possible by error correction processing at the time of reproduction, recording is continued without performing replacement processing. Therefore, recording on the optical disc can be performed in a short time without deteriorating the recording quality.

  In this case, as in the optical disc apparatus according to claim 10, the processing apparatus may resume recording from a position where the defect is avoided when the size of the defect exceeds the upper limit value. it can.

  11. Each of the optical disk apparatuses according to claim 9 and 10, further comprising a buffer memory for temporarily storing recording data to be recorded on the optical disk as in the optical disk apparatus according to claim 11, wherein the processing apparatus The recording can be temporarily interrupted when the amount of recording data stored in the buffer memory is smaller than a preset value when a defect is detected.

  The invention described in claim 12 includes an optical pickup device that collects light on the recording surface of the optical disc, receives return light from the recording surface, and outputs a photoelectric conversion signal, and records information on the optical disc. A program used in a possible optical disc apparatus, a procedure for determining whether or not there is a defect based on the photoelectric conversion signal; and if the result of the determination is that there is a defect, recording is temporarily interrupted; A procedure for detecting the size of the defect; a procedure for comparing the size of the detected defect with a preset upper limit value; and as a result of the comparison, the size of the defect is less than or equal to the upper limit value. In this case, the program for causing the control computer of the optical disc apparatus to execute the procedure of resuming the recording from the position where the recording was interrupted.

  According to this, when the program of the present invention is loaded into a predetermined memory and the start address is set in the program counter, the control computer of the optical disc apparatus determines whether or not there is a defect based on the photoelectric conversion signal. If there is a defect as a result of the determination, the recording is temporarily interrupted and the size of the defect is detected. Then, the size of the detected defect is compared with a preset upper limit value, and when the size of the defect is equal to or smaller than the upper limit value as a result of the comparison, the recording is resumed from the position where the recording was interrupted. That is, according to the program of the present invention, it is possible to cause the computer for controlling the optical disk apparatus to execute the recording method according to the first aspect of the present invention, thereby recording on the optical disk without degrading the recording quality. This can be done in a short time.

  In this case, as in the program according to claim 13, when the size of the defect exceeds the upper limit as a result of the comparison, a procedure for resuming recording from a position where the defect is avoided is used for the control. The computer can be further executed.

  The invention described in claim 14 is a computer-readable recording medium in which the program according to claim 12 or 13 is recorded.

  According to this, since the program according to the twelfth or thirteenth aspect is recorded, it is possible to perform recording on the optical disc in a short time without causing deterioration in recording quality by causing the computer to execute the program. .

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a schematic configuration of an optical disc apparatus 20 according to an embodiment of the present invention.

  An optical disk apparatus 20 shown in FIG. 1 includes a spindle motor 22 that rotates and drives an optical disk 15, an optical pickup apparatus 23, a seek motor 21 that drives the optical pickup apparatus 23 in a sledge direction, a laser control circuit 24, an encoder 25, and a motor. A control circuit 26, a PU control circuit 27, a reproduction signal processing circuit 28, a buffer RAM 34, a buffer manager 37, an interface 38, a flash memory 39, a CPU 40, a RAM 41, and the like are provided. In addition, the connection line in FIG. 1 shows the flow of a typical signal and information, and does not represent all the connection relationships of each block. As an example, it is assumed that a DVD-type recordable optical disc is used for the optical disc 15.

  The optical pickup device 23 is a device for irradiating a recording surface on which a spiral or concentric track of the optical disk 15 is formed with laser light and receiving reflected light from the recording surface. The optical pickup device 23 includes a light source that emits laser light having a wavelength of 660 nm, an objective lens that condenses light from the light source on a recording surface, and a light receiver that receives reflected light reflected by the recording surface and passing through the objective lens. , And a drive system (both not shown) that finely drives the objective lens in the focus direction and tracking direction.

  The reproduction signal processing circuit 28 includes an I / V amplifier 28a, a servo signal detection circuit 28b, a wobble signal detection circuit 28c, an RF signal detection circuit 28d, a decoder 28e, a defect detection circuit 28f, and the like.

  The I / V amplifier 28a converts the output signal (photoelectric conversion signal) of the light receiver of the optical pickup device 23 into a voltage signal and amplifies it with a predetermined gain.

  The servo signal detection circuit 28b detects servo signals such as a focus error signal and a track error signal based on the output signal of the I / V amplifier 28a.

  The wobble signal detection circuit 28c detects a wobble signal based on the output signal of the I / V amplifier 28a.

  The RF signal detection circuit 28d detects an RF signal based on the output signal of the I / V amplifier 28a.

  The decoder 28e extracts address information, synchronization information, and the like from the wobble signal. The decoder 28e performs a decoding process and an error detection process on the RF signal. When an error is detected, the decoder 28e performs an error correction process, and then stores the reproduced data in the buffer RAM 34 via the buffer manager 37. To do.

  As shown in FIG. 2 as an example, the defect detection circuit 28f adds all the output signals of the light receivers of the optical pickup device 23 via the I / V amplifier 28a, and amplifies the signals with a predetermined gain. A low-pass filter f2 that removes high-frequency components contained in the output signal of the amplifier f1, a comparator f3 that compares the output signal of the low-pass filter f2 with a predetermined slice level and outputs the comparison result, and the spiral direction of the track or And a timer counter f4 for detecting the size of the defect in the circumferential direction (hereinafter referred to as “track direction” for convenience). The gain of the amplifier f1 is variable and is adjusted so that the output level of the low-pass filter f2 is substantially constant. The slice level is set to an appropriate value in advance so that defects can be detected with high accuracy.

  For example, as shown in FIG. 3A, if there is a defect on a track to be scanned (hereinafter abbreviated as “scan track”), the amount of reflected light from the recording surface is an example during recording. As shown in FIG. 3B, the amount of light corresponding to the modulated laser beam is obtained in a portion having no defect, and the amount of light is reduced in a defective portion due to a decrease in reflectance. In addition, when recording is interrupted, the light source is driven with a constant low light emission power, and as an example, as shown in FIG. 3C, the non-defective portion has a constant light amount, and the defective portion The amount of light is a little lower than the non-existing part. Therefore, the gain of the amplifier f1 is adjusted so that the output level of the low-pass filter f2 (FIG. 3D) is substantially the same (FIG. 3D) when recording and when recording is interrupted. If there is a defect in an unrecorded track, the amount of reflected light is at the same level as in FIG. Then, the output signal of the low-pass filter f2 is binarized by the comparator f3, and the output signal of the comparator f3 is a pulse signal as shown in FIG. 3E as an example. Therefore, the pulse width in the pulse signal corresponds to the size of the defect in the track direction. This pulse signal is output to the gate terminal of the timer counter f4 and the interrupt terminal of the CPU 40. The gain adjustment of the amplifier f1 is performed according to an instruction from the CPU 40.

  When the pulse signal is input to the timer counter f4, the count value is reset to 0 in synchronization with the rising timing of the pulse signal and starts counting up. Then, the count value is incremented by 1 at regular intervals, and the count-up is stopped in synchronization with the falling timing of the pulse signal. Therefore, the count value is a value corresponding to the size of the pulse width, that is, the size of the defect in the track direction. The count value of the timer counter f4 can be read from the CPU 40.

  The PU control circuit 27 generates a control signal for correcting focus deviation and track deviation based on the servo signal from the servo signal detection circuit 28b, and outputs the control signal to the drive system of the optical pickup device 23.

  The motor control circuit 26 drives and controls the spindle motor 22 and the seek motor 21 based on instructions from the CPU 40.

  The buffer RAM 34 temporarily stores data to be recorded on the optical disc 15 (recording data), data reproduced from the optical disc 15 (reproduction data), and the like. Data input / output to / from the buffer RAM 34 is managed by the buffer manager 37.

  The encoder 25 takes out the recording data stored in the buffer RAM 34 through the buffer manager 37 based on an instruction from the CPU 40, modulates the data, adds an error correction code, etc., and writes a signal to the optical disc 15. Is generated.

  The laser control circuit 24 controls the power of laser light emitted from the optical pickup device 23. For example, during recording, a light source driving signal is generated based on the write signal, recording conditions, light emission characteristics of the light source, and the like.

  The interface 38 is a bidirectional communication interface with a host device (for example, a personal computer), and is a standard interface such as ATAPI (AT Attachment Packet Interface), SCSI (Small Computer System Interface), and USB (Universal Serial Bus). It is compliant.

  The flash memory 39 stores various programs including a program according to the present invention described by codes readable by the CPU 40, recording conditions, light emission characteristics of the light source, and the like.

  The CPU 40 controls the operation of each unit according to a program stored in the flash memory 39 and saves data necessary for control in the RAM 41.

<Recording process>
Next, processing in the optical disc device 20 when a recording request is received from the host device will be described with reference to FIG. The flowchart in FIG. 4 corresponds to a series of processing algorithms executed by the CPU 40. When a recording request command is received from the host device, the head address of a program (hereinafter referred to as “recording processing program”) corresponding to the flowchart of FIG. Start. Note that the recording data from the host device is, for example, streaming data such as recorded data.

  In the first step 401, “0”, which means that recording interruption is not prohibited, is set in the recording interruption prohibiting flag f indicating whether recording interruption is prohibited.

  In the next step 403, the motor control circuit 26 is instructed to rotate the optical disc 15 at a predetermined linear velocity (or angular velocity), and the reproduction signal processing circuit 28 is notified that the recording request command has been received from the host device. .

  In the next step 405, the motor control circuit 26 is instructed to form a light spot near the target position corresponding to the designated address. Thereby, a seek operation is performed. If the seek operation is unnecessary, the process here is skipped.

  In the next step 407, recording is permitted. Thereby, the recording operation is started by the encoder 25, the laser control circuit 24, the reproduction signal processing circuit 28, etc., and the information corresponding to the recording data is sequentially recorded on the recording surface of the optical disc 15 as described above. . Further, the gain of the amplifier f1 is adjusted to the gain at the time of recording.

  In the next step 409, the data amount specified by the recording request command is compared with the data amount recorded up to the present time, and it is determined whether or not the recording is completed. If the recording has not been completed, the determination here is denied and the routine proceeds to step 411.

  In step 411, the count value c of the timer counter f4 is read.

  In the next step 413, the count value c is compared with a preset threshold value N to determine whether or not a defect has been detected. If the count value c is equal to or greater than the threshold value N, it is determined that a defect has been detected, and the process proceeds to step 415. That is, here, the magnitude of the factor that reduces the amount of light reflected from the recording surface (for example, dust, dust, oil, scratches, etc. as acquired) in the track direction is greater than or equal to a preset value. Is regarded as a defect.

  In this step 415, it is determined whether or not the recording interruption prohibition flag f is 1. If the recording interruption prohibition flag f is not 1, the determination here is denied and the routine proceeds to step 417.

  In this step 417, the data amount of the recording data currently stored in the buffer RAM 34 is acquired via the buffer manager 37, and it is determined whether or not the upper limit value M is set in advance. If the storage amount of the recording data is not equal to or greater than the upper limit value M, the determination here is denied and the routine proceeds to step 419.

  In step 419, the encoder 25, the laser control circuit 24, the reproduction signal processing circuit 28, etc. are instructed to interrupt recording.

  In the next step 421, the gain of the amplifier f1 is adjusted to the gain at the time of recording interruption, and the maximum length of the defect in the track direction (hereinafter referred to as “defect length d” for convenience) is calculated as the defect scale information. To do. Specifically, the tracking is continued as it is, and the number of circulating tracks is counted for each rotation with the recording interruption position as a base point, and the count value c of the timer counter f4 is read and sequentially stored in the RAM 41. Then, when the interruption from the defect detection circuit 28f does not occur even after one rotation, it is determined that the defect area has been exceeded, the maximum value of the count value c stored in the RAM 41, the radius position obtained from the address, The defect length d is calculated from the linear velocity obtained from the rotational speed of the spindle motor 22.

  In the next step 423, it is determined whether or not the defect length d exceeds a preset threshold value L (for example, 0.5 mm). If the defect length d exceeds the threshold value L, the determination here is affirmed and the routine proceeds to step 431. The threshold value L is an upper limit value of the defect length that does not affect the reproduction, and is acquired in advance by experiments, simulations, or the like.

  In step 431, a position avoiding the defective area is calculated. Specifically, the number of sectors in units of ECC blocks corresponding to the number of circular tracks is added to the physical address at the position where the recording is interrupted, and the obtained physical address is set as a position avoiding the defective area.

  In the next step 433, an instruction to resume recording from a position avoiding the defective area is given.

  In the next step 435, information on the defective area is stored in the RAM 41. Then, the process returns to Step 409.

  In step 423, if the defect length d is equal to or smaller than the threshold value L, the determination here is denied and the process proceeds to step 441.

  In this step 441, an instruction to resume recording from the interrupted position is given.

  In the next step 443, “1”, which means that recording interruption is prohibited, is set in the recording interruption prohibition flag f. Then, the process returns to Step 409.

  If it is determined in step 417 that the recording data storage amount is equal to or greater than the upper limit M, the determination here is affirmed and the routine proceeds to step 451.

  In step 451, it is determined whether or not there has been an interruption from the defect detection circuit 28f for one or more rounds. If there is an interruption from the defect detection circuit 28f within one round, the determination here is denied and the processing returns to step 409. On the other hand, if there is no interruption from the defect detection circuit 28f for one turn or more, the determination here is affirmed and the routine proceeds to step 453.

  In this step 453, the recording interruption prohibition flag f is set to “0” which means that recording interruption is not prohibited. Then, the process returns to Step 409.

  If the recording interruption prohibition flag f is 1 in step 415, the determination here is affirmed, and the routine proceeds to step 451.

  If the count value c is not greater than or equal to the threshold value N in step 413, it is determined that no defect has been detected, and the process proceeds to step 451.

  Furthermore, if the recording is completed in step 409, the determination here is affirmed, and the routine proceeds to step 461.

  In step 461, it is determined whether defect information is stored in the RAM 41 or not. If the defect information is stored in the RAM 41, the determination here is affirmed, and the routine proceeds to step 463.

  In this step 463, the defect information stored in the RAM 41 is recorded on the optical disc 15. Here, as an example, defect information is recorded in the lead-in area of the optical disc 15.

  In the next step 465, dummy data is recorded in the defective area of the optical disk 15.

  In the next step 467, the host device is notified of the end of recording. Then, the recording process ends.

  That is, defect detection is performed in parallel with recording based on the reflected light from the recording surface. When a defect is detected, recording is temporarily stopped and the size of the defect is measured. When the size of the defect exceeds the preset size, as shown in FIG. 5 as an example, recording is resumed from the position where the defect is avoided, while the size of the defect is When the size is smaller than the set size, as shown in FIG. 6 as an example, recording is resumed from the interrupted position. As a result, recording can be performed in a shorter time than before without degrading the recording quality.

  As is clear from the above description, in the optical disc device 20 according to the present embodiment, a processing device is configured by the CPU 40 and a program executed by the CPU 40. It should be noted that at least a part of the processing according to the program by the CPU 40 may be configured by hardware, or all may be configured by hardware.

  In the present embodiment, the program according to the present invention is executed by the program corresponding to FIG. 4 among the programs recorded in the flash memory 39 as the recording medium.

  In the recording process, the recording method according to the present invention is implemented.

  As described above, according to the optical disc device 20 according to the present embodiment, during recording, the presence or absence of a defect is monitored based on the photoelectric conversion signal, and recording is temporarily interrupted when a defect is detected, When the size of the defect is not more than the preset upper limit value that does not affect the reproduction, the recording is resumed from the position where the recording was interrupted. As a result, even if there is a defect that crosses a plurality of tracks, if it is clear that it can be corrected by, for example, error correction processing during reproduction, recording is continued without performing replacement processing. Therefore, recording on the optical disc can be performed in a short time without deteriorating the recording quality.

  Further, according to the present embodiment, the storage amount of the recording data stored in the buffer RAM 34 is checked before the recording is interrupted, and when the storage amount is the upper limit value M or more, the recording is continued. Thereby, the overflow of the recording data can be prevented. For example, when information must be recorded at any time, such as when recording a television broadcast, the time calculated from the free capacity of the buffer RAM 34 and the data transfer rate from the host device is between recording interruption and recording resumption. It is available time. That is, the recording interruption is postponed when the time required from the recording interruption to the resumption of recording cannot be secured.

  Further, according to the present embodiment, defect information is recorded on the optical disc 15 when a defect is avoided. Thereby, when the optical disk 15 is set in another optical disk apparatus, the optical disk apparatus can handle information that is physically interrupted based on the defect information as continuous information.

  According to the present embodiment, when a defect is avoided, dummy data is recorded in the defective area. Thereby, even if a defective area is reproduced by mistake, it can be immediately recognized that it is a defective area, so that the access speed can be improved.

  In the above-described embodiment, the case has been described in which the tracking is continuously performed in step 421 to calculate the defect length d. However, the present invention is not limited to this, for example, as shown in FIG. The defect length d may be calculated by jumping in the direction of adding addresses by a predetermined number of tracks. Thereby, processing time can be shortened. As an example, as shown in FIG. 8, the jump is made in the direction of adding addresses by a predetermined number of tracks. If the presence / absence of a defect is the same as before the jump, the presence / absence of the defect is If they are different, the length d of the defect may be calculated by sequentially jumping in the opposite direction to that before the jump by halving the number of tracks to jump. Thereby, the processing time can be further shortened.

  In the above embodiment, the case where the maximum length of the defect in the track direction is calculated as the defect size information in step 421 has been described. However, the present invention is not limited to this. For example, the maximum length of the defect in the radial direction is described. This may be calculated as defect size information.

  In this case, the larger of the maximum length of the defect in the track direction and the maximum length of the defect in the radial direction may be used as the defect scale information.

  In the above embodiment, when it is certain that the capacity of the buffer RAM 34 is sufficiently larger than the recording data, the processing in step 417 in the recording processing can be omitted.

  In the above embodiment, the case where the optical disk 15 is a DVD-type optical disk has been described. However, the present invention is not limited to this, and may be a next-generation optical disk corresponding to light having a wavelength of 405 nm, for example.

  In the above embodiment, the optical disc apparatus capable of recording and reproducing information has been described. However, the present invention is not limited to this, and any optical disc apparatus capable of recording at least information among recording, reproducing and erasing of information may be used. . Further, the optical disk apparatus may be a DVD recorder capable of the above recording process.

  Moreover, although the said embodiment demonstrated the case where the optical disk had one recording layer, it may have not only this but a several recording layer.

  In the above embodiment, the program according to the present invention is recorded in the flash memory 39, but is recorded in another recording medium (CD, magneto-optical disk, DVD, memory card, USB memory, flexible disk, etc.). May be. In this case, the program according to the present invention is loaded into the flash memory 39 via the playback device (or dedicated interface) corresponding to each recording medium. Further, the program according to the present invention may be transferred to the flash memory 39 via a network (LAN, intranet, Internet, etc.). In short, the program according to the present invention may be loaded into the flash memory 39.

  In the above embodiment, the case where the optical pickup device includes one semiconductor laser has been described. However, the present invention is not limited thereto, and for example, a plurality of semiconductor lasers that emit light beams having different wavelengths may be included. In this case, for example, at least one of a semiconductor laser that emits a light beam with a wavelength of about 405 nm, a semiconductor laser that emits a light beam with a wavelength of about 660 nm, and a semiconductor laser that emits a light beam with a wavelength of about 780 nm may be included. . That is, the optical disk apparatus may be an optical disk apparatus that supports a plurality of types of optical disks that conform to different standards.

  As described above, the recording method of the present invention is suitable for performing recording on an optical disc in a short time without deteriorating the recording quality. Further, the optical disk device of the present invention is suitable for performing recording on an optical disk in a short time without deteriorating the recording quality. The program and the storage medium of the present invention are suitable for causing an optical disk device to record on an optical disk in a short time without degrading the recording quality.

1 is a block diagram showing a configuration of an optical disc device according to an embodiment of the present invention. It is a figure for demonstrating the defect detection circuit in FIG. 3A to 3E are diagrams for explaining the operation of the defect detection circuit of FIG. 3 is a flowchart for explaining processing in the optical disc apparatus in FIG. 1 when a recording request is received from a host apparatus. FIG. 6 is a diagram (part 1) for explaining processing in the optical disc apparatus in FIG. 1 when a recording request is received from a host device; FIG. 8 is a diagram (No. 2) for explaining the processing in the optical disc device in FIG. 1 when a recording request is received from a higher-level device. It is a figure for demonstrating the modification 1 of the process in step 421 in FIG. It is a figure for demonstrating the modification 2 of the process in step 421 in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 15 ... Optical disk, 20 ... Optical disk apparatus, 23 ... Optical pick-up apparatus, 39 ... Flash memory (recording medium), 40 ... CPU (processing apparatus, control computer).

Claims (14)

A recording method for recording information on an optical disc having a recording surface on which spiral or concentric tracks are formed,
Determining whether or not the track has a defect based on the reflected light from the recording surface during recording;
If there is a defect as a result of the determination, temporarily stopping recording and detecting the size of the defect;
And resuming the recording from the position where the recording was interrupted when the size of the detected defect is not more than a preset upper limit value.   The recording method according to claim 1, further comprising a step of resuming recording from a position where the defect is avoided when the size of the detected defect exceeds the upper limit value.   The recording method according to claim 2, further comprising a step of recording dummy data in an unrecorded area generated by avoiding the defect.   4. The recording method according to claim 2, further comprising a step of recording information on the defect area on the optical disc.   In the step of determining whether or not there is a defect, it is determined that there is a defect when the decrease in the amount of reflected light continues for a preset time or more. The recording method according to any one of the above.   In the step of detecting the size of the defect, any one of the maximum length of the defect in the spiral direction or the circumferential direction of the track and the maximum length of the defect in the radial direction of the optical disc is set as the size of the defect. The recording method according to any one of claims 1 to 5, wherein:   In the step of detecting the size of the defect, the larger of the maximum length of the defect in the spiral direction or the circumferential direction of the track and the maximum length of the defect in the radial direction of the optical disc is the larger of the size of the defect. The recording method according to claim 1, wherein:   8. The step of detecting the size of the defect detects the size of the defect while performing a track jump for at least one track in the radial direction of the optical disc. The recording method according to item. An optical disc apparatus capable of recording information on an optical disc having a recording surface on which spiral or concentric tracks are formed,
An optical pickup device that collects light on the recording surface of the optical disc, receives return light from the recording surface, and outputs a photoelectric conversion signal;
During recording, the presence or absence of defects is monitored based on the photoelectric conversion signal, recording is temporarily interrupted when a defect is detected, and when the size of the defect is less than or equal to a preset upper limit value, An optical disk device comprising: a processing device that resumes recording from a position at which recording was interrupted.   The optical disk apparatus according to claim 9, wherein the processing device restarts recording from a position where the defect is avoided when the size of the defect exceeds the upper limit value. A buffer memory for temporarily storing recording data to be recorded on the optical disc;
The processing device is characterized in that the recording is temporarily interrupted when the amount of recording data stored in the buffer memory is smaller than a preset value when a defect is detected. The optical disc apparatus according to claim 9 or 10. A program used in an optical disc apparatus that has an optical pickup device that collects light on a recording surface of an optical disc, receives return light from the recording surface and outputs a photoelectric conversion signal, and can record information on the optical disc. There,
Determining whether there is a defect based on the photoelectric conversion signal;
If there is a defect as a result of the determination, a procedure of temporarily interrupting recording and detecting the size of the defect;
A procedure for comparing the size of the detected defect with a preset upper limit value;
A program for causing the control computer of the optical disc apparatus to execute a procedure of resuming recording from a position where recording was interrupted when the size of the defect is equal to or less than the upper limit value as a result of the comparison.   13. The control computer is further caused to execute a procedure for resuming recording from a position where the defect is avoided when the size of the defect exceeds the upper limit as a result of the comparison. The listed program. A computer-readable recording medium on which the program according to claim 12 or 13 is recorded.

Images