JP2005063606A - Optical disk and optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk capable of accurately predicting the deviation of a recording position from a target position. <P>SOLUTION: When a prescribed reference mark is formed on the top position of at least one of addresses distributed to a specific area of a meandering track G, prescribed positional relation between a reference position in the meandering shape of the track and the reference mark position is obtained, and when a wobble signal from a specific area of an optical disk is compared with an RF signal by using an optical disk device, the delay quantity of the wobble signal can be detected, so that the deviation of the recording position from the target position can be accurately predicted. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical disc and an optical disc apparatus, and more particularly to an optical disc having a recording surface on which spiral or concentric information recording tracks are formed, and an optical disc apparatus using the optical disc as a data recording target medium. .

  In recent years, with the advancement of digital technology and the improvement of data compression technology, CD (compact disc) and data equivalent to about 7 times that of CD are used as media for recording user data such as music, movies, photos and computer software. An optical disk such as a DVD (digital versatile disc) that enables recording on a disk having the same diameter as that of a CD has been attracting attention, and an optical disk apparatus that uses the optical disk as a data recording medium is becoming popular with a reduction in price. Became.

  In general, in a write-once optical disc such as DVD + R and a rewritable optical disc such as DVD + RW, information corresponding to various types of incidental information is recorded by wobbling a track in advance during manufacturing and modulating the meandering shape. Yes. For example, a phase modulation method is used in DVD + R and DVD + RW (hereinafter also referred to as “DVD + system” for convenience).

  Therefore, for example, in an optical disk device compatible with the DVD + system, when accessing the optical disk, a wobble signal corresponding to a meandering shape is detected from a return light beam emitted from a light source and reflected by a track, and the wobble signal is phase-demodulated. The various incidental information is acquired. Of particular importance as supplementary information is ADIP (Address in Pregroove) information. This ADIP information includes synchronization information and address information.

  A reference clock signal is generated from the wobble signal. When recording user data, the recording position is controlled based on the reference clock signal.

  Various devices for reproducing data by adjusting the phase of a reproduction clock signal have been proposed (see, for example, Patent Documents 1 to 4). Further, Patent Document 5 discloses an exposure apparatus for an optical disk master having prepits for phase adjustment of a reproduction clock signal.

  As a circuit for detecting a reference clock signal from a wobble signal, a band pass filter circuit, a PLL (Phase Locked Loop) circuit, or the like is used. These circuits cause the phase of the wobble signal to be delayed. Since the delay amount changes depending on the temperature and the recording speed, if the recording speed is increased in the future, there is a possibility that when the data is additionally recorded, it overlaps with a part of the already recorded data. If this overlap is large, data cannot be reproduced even if the phase of the clock signal for reproduction is adjusted using, for example, the devices disclosed in Patent Documents 1 to 4 below.

JP 9-326138 A JP-A-5-303833 JP-A-8-7291 JP-A-8-45188 Japanese Patent No. 3032500

  The present invention has been made under such circumstances, and a first object thereof is to provide an optical disc capable of accurately predicting a deviation of a recording position from a target position.

  A second object of the present invention is to provide an optical disc apparatus capable of recording with excellent recording quality on the optical disc of the present invention.

  The invention according to claim 1 has a recording surface on which a spiral or concentric meandering recording track is formed, and the head of at least one of addresses assigned to a specific area of the track This is an optical disc in which a predetermined reference mark is formed at a position.

  According to this, since a predetermined reference mark is formed at the head position of at least one address among the addresses allocated to the specific area of the meandering track, the reference position in the meandering shape of the track And the reference mark position have a predetermined positional relationship. For example, the wobble signal delay amount can be detected by comparing the wobble signal from the specific area of the optical disc with the RF signal using the optical disc apparatus. Is possible. Accordingly, as a result, it is possible to accurately predict the deviation of the recording position from the target position.

  In this case, as in the optical disk according to the second aspect, the specific area can be an area included in an area on the inner circumference side of a data area in which user data is recorded.

  In the optical disk according to claim 1, as in the optical disk according to claim 3, the specific area is an area included in an outer peripheral area from a data area in which user data is recorded. it can.

  The optical disk according to any one of claims 1 to 3, wherein, as in the optical disk according to claim 4, the track is provided in a guide groove formed in a spiral shape or a concentric shape, and the reference mark defines the guide groove in a predetermined manner. It can be assumed that it is formed by not forming the length of.

  In the optical disk according to any one of claims 1 to 3, the reference mark may be a pit having a predetermined length as in the optical disk according to claim 5.

  In this case, the length of the pit may be different from the length of the pit used for recording user data.

  In this case, the reference mark may be formed for each recording unit as in the optical disk according to the seventh aspect.

  In this case, the recording unit may be one ECC block, as in the optical disk according to the eighth aspect.

  A ninth aspect of the present invention is an optical disc apparatus using the optical disc according to any one of the first to eighth aspects as a data recording target medium, wherein the optical disc apparatus is placed in a data area of the optical disc in synchronization with a reference clock signal. Data recording means for recording data; detecting the reference mark and the wobble signal from a specific area of the optical disc; obtaining a delay amount of the wobble signal based on the detection result; and determining the reference based on the delay amount An optical disc device comprising: signal correction means for correcting a clock signal.

  According to this, the reference mark and the wobble signal are detected from the specific area of the optical disc by the signal correcting means, the delay amount of the wobble signal is obtained based on the detection result, and the reference clock signal is further calculated based on the delay amount. Is corrected. Then, data is recorded in the data area of the optical disc by the data recording means in synchronization with the corrected reference clock signal. Accordingly, it is possible to suppress the shift of the recording position with respect to the target position, and as a result, it is possible to perform recording with excellent recording quality on the optical disc of the present invention.

  In this case, as in the optical disc apparatus according to the tenth aspect, the signal correction unit can detect the reference mark based on an RF signal obtained from the specific area.

  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, an optical pickup apparatus 23, a laser control circuit 24, an encoder 25, a motor driver 27, and a reproduction signal for driving the optical disk 15 according to an embodiment of the present invention. A processing circuit 28, a servo controller 33, 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 shown in FIG. 2, a groove G as a spiral guide groove is formed in the recording layer M of the optical disc 15. In general, in an optical disc, when viewed from the incident direction of laser light, a convex portion is called a groove G, and a concave portion is called a land L. In this embodiment, the groove G is an information recording track, and data is recorded in the groove G.

  As shown in FIG. 3 as an example, the groove G is meandering (wobbing). In this embodiment, as an example, the meandering shape of the groove G is assumed to conform to the DVD + R standard.

  According to the DVD + R standard, the meandering shape of a track is determined by an ADIP unit and a carrier wave. The ADIP unit contains various information. The carrier wave is used to form a reference clock signal. In this embodiment, a basic unit composed of one ADIP unit and a series of carrier waves is referred to as an information frame. As shown in FIG. 4 as an example, the size of one information frame is 93 wobbles (wobble numbers 0 to 92) when the size of one carrier wave period (also referred to as a wobble period) is 1 wobble. . The wobble numbers 0 to 7 are ADIP units, and the wobble numbers 8 to 92 are carrier parts. An ADIP unit in a data zone, which is an area where data is recorded, includes an area including synchronization information (hereinafter referred to as “synchronization information section”) and an area including address information (hereinafter referred to as “ADIP information section”). ). The wobble numbers 0 to 3 are synchronization information parts, and the wobble numbers 4 to 7 are ADIP information parts. That is, the synchronization information part is 4 wobbles and the ADIP information part is 4 wobbles. Each of the information sections is phase-modulated (PSK: Phase Shift Keying).

  In the ADIP information part, 4 wobbles represent 1-bit data. When the bit data is “0”, as shown in FIG. 5A, the front two wobbles have the same phase as the carrier part, and the rear two wobbles have the opposite phase to the carrier part. On the other hand, when the bit data is “1”, as shown in FIG. 5B, the front two wobbles have the opposite phase to the carrier part and the rear two wobbles have the same phase as the carrier part. The address data requires 51 bits.

  When the ADIP information part in the next information frame is the first bit of the address data, the synchronization information part reverses the word sync signal, that is, all four wobbles with the carrier part as shown in FIG. Phase. Further, when bit data is included in the ADIP information part, as shown in FIG. 6B, the bit sync signal, that is, the leading one wobble is set in the opposite phase to the carrier part, and the remaining 3 The wobble is in phase with the carrier part. Therefore, as shown in FIG. 7, one address information (ADIP word) is obtained by 52 information frames (ADIP bits).

  Next, a layout corresponding to a single session of an information area (Information Zone) as an area in which various information is written in DVD + R will be described with reference to FIG.

  As shown in FIG. 8, the information area IZ has an inner drive area IDA, a lead-in zone LIZ, and a data zone (Data Zone DZ, Lead-out Zone LOZ, and Outer Drive Area ODA. In the actual optical disc 15, the information area IZ has a spiral shape, but in FIG. 8, the information area IZ is shown in a straight line for convenience.

  As shown in FIG. 9, the inner drive area IDA includes an initial zone, an inner disc test zone, an inner disc count zone (inner disc count zone). Zone), an inner disc administration zone, and a table of contents zone.

  The initial zone has a head position at a position where the distance Nr from the rotation center of the optical disk 15 is 22.000 mm. The inner disk test zone has a leading position at a distance Nr from the rotation center of 22.643 mm, and the physical sector number (hereinafter also referred to as “PSN”) of the first physical sector is 023480h. The inner disk count zone has a head position at a position where the distance Nr from the center of rotation is 23.079 mm, and the PSN of the first physical sector is 027480h. The inner disk administration zone has a head position at a position where the distance Nr from the rotation center is 23.186 mm, and the PSN of the first physical sector is 028480h. The table of content zone has a head position at a position where the distance Nr from the rotation center is 23.293 mm, and the PSN of the first physical sector is 029480h.

  The lead-in zone LIZ has a head position at a position where the distance Nr from the rotation center is 23.400 mm, and the PSN of the first physical sector is 02A480h.

  The data zone DZ has a head position at a position where the distance Nr from the rotation center is 24.000 mm, and the PSN of the first physical sector is 030000h.

  In the lead-out zone LOZ, when data is recorded in all of the data zones DZ, the leading position is at a position where the distance Nr from the rotation center is 58.000 mm, and the PSN of the first physical sector is 260540h. It is.

  As shown in FIG. 10, the outer drive area ODA includes an outer disc administration zone, an outer disc count zone, and an outer disc disc. It consists of a test zone (Outer Disc Test Zone) and a guard zone 3 (Guard Zone 3).

  The outer disk administration zone has a head position at a position where the distance Nr from the rotation center is 58.053 mm, and the PSN of the first physical sector is 261940h. The outer disk count zone has a head position at a position where the distance Nr from the rotation center is 58.096 mm, and the PSN of the first physical sector is 262940h. The outer disk test zone has a head position at a position where the distance Nr from the rotation center is 58.139 mm, and the PSN of the first physical sector is 263940h. The guard zone 3 has a head position at a position where the distance Nr from the rotation center is 58.310 mm, and the PSN of the first physical sector is 267940h.

  In the present embodiment, as an example, a reference mark is formed in a part of the initial zone and the guard zone 3. This reference mark is used to correct the delay of the reference clock signal formed from the carrier wave portion.

  In the initial zone, as shown in FIG. 11 as an example, as the area close to the inner disk test zone, in PSN = 03000h to 023070h, one ECC block, that is, the head portion of each ECC block for every 16 physical sectors The groove G is not formed by a predetermined length from the position corresponding to. This unformed portion becomes a reference mark. Note that the position of PSN = 03000h is the head position of address = 008C00h.

  In the guard zone 3, as shown in FIG. 12 as an example, in PSN = 267940h to 2679C0h, a position corresponding to the head portion of each ECC block as an area close to the outer disk test zone. The groove G is not formed for a predetermined length. This unformed portion becomes a reference mark. Note that the position of PSN = 267940h is the head position of address = 099E50h.

  The optical pickup device 23 is a device for irradiating the recording surface on which the spiral or concentric tracks of the optical disk 15 are formed with laser light and receiving reflected light from the recording surface. As shown in FIG. 13 as an example, the optical pickup device 23 includes a light source unit 51, a collimating lens 52, a beam splitter 54, an objective lens 60, a detection lens 58, a light receiver PD, and a drive system (focusing actuator, tracking actuator). And a seek motor (both not shown).

  The light source unit 51 includes a semiconductor laser LD as a light source that emits laser light having a wavelength of 660 nm. In the present embodiment, the maximum intensity emission direction of the laser beam emitted from the light source unit 51 is defined as the + X direction.

  The collimating lens 52 is disposed on the + X side of the light source unit 51 and makes the light beam emitted from the light source unit 51 substantially parallel light.

  The beam splitter 54 is disposed on the + X side of the collimating lens 52 and transmits the light beam that has been made substantially parallel light by the collimating lens 52 as it is. Further, the beam splitter 54 branches a light beam (return light beam) reflected by the optical disk 15 and incident via the objective lens 60 in the −Z direction.

  The objective lens 60 is disposed on the + X side of the beam splitter 54 and condenses the light beam transmitted through the beam splitter 54 on the recording surface of the optical disc 15.

  The detection lens 58 is disposed on the −Z side of the beam splitter 54, and condenses the return light beam branched in the −Z direction by the beam splitter 54 on the light receiving surface of the light receiving device PD. The light receiver PD includes a plurality of light receiving elements, and outputs a signal including wobble signal information, reproduction data information, focus error information, track error information, and the like to the reproduction signal processing circuit 28.

  As shown in FIG. 14, 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 clock generation circuit 28f, and an address detection. The circuit 28g, the delay amount detection circuit 28h, and the like are included.

  The I / V amplifier 28a converts the current signal from the light receiver PD into a voltage signal. The servo signal detection circuit 28b detects a servo signal (such as a focus error signal and a track error signal) based on the output signal of the I / V amplifier 28a. The servo signal detected here is output to the servo controller 33. The wobble signal detection circuit 28c detects the wobble signal Swb based on the output signal of the I / V amplifier 28a. The wobble signal Swb detected here is output to the clock generation circuit 28f, the address detection circuit 28g, and the delay amount detection circuit 28h. The RF signal detection circuit 28d detects the RF signal Srf based on the output signal of the I / V amplifier 28a. The RF signal Srf detected here is output to the decoder 28e and the delay amount detection circuit 28h.

  The decoder 28e performs decoding processing, error detection processing, and the like on the RF signal Srf, and then stores the reproduced data in the buffer RAM 34 via the buffer manager 37. The decoder 28e performs a predetermined error correction process when an error is detected in the error detection process.

  The delay amount detection circuit 28h detects a delay amount based on the wobble signal Swb and the RF signal Srf in response to an instruction from the CPU 40. Here, as an example, as shown in FIG. 15, the delay amount Dt is detected from the difference between the signal level reduction start position of the RF signal Srf and the zero cross position of the wobble signal Swb. The delay amount Dt detected here is output to the CPU 40. Note that the waveform of the alternate long and short dash line in FIG. 15 indicates the wobble signal Swb when the delay amount is zero.

  The clock generation circuit 28f generates a reference clock signal (Wck) based on the wobble signal Swb and corrects the reference clock signal Wck based on delay amount information from the CPU 40. Here, as an example, the clock generation circuit 28f includes a band pass filter (BPF) f1, a binarization circuit f2, a PLL (Phase Locked Loop) circuit f3, and a delay correction circuit f4, as shown in FIG. . The band pass filter f1 extracts a carrier wave component from the wobble signal Swb. The binarization circuit f2 binarizes the output signal of the band pass filter f1. The PLL circuit f3 generates a reference clock signal Wck synchronized with the output signal of the binarization circuit f2. The reference clock signal Wck generated here is output to the delay correction circuit f4 and the address detection circuit 28g. The cycle of the reference clock signal Wck is 32T (T: the cycle of the channel clock). The delay correction circuit f4 corrects the reference clock signal Wck based on the delay amount information from the CPU 40 and supplies it to the encoder 25 as a corrected reference clock signal Wck ′.

  The address detection circuit 28g detects address data from the wobble signal Swb. Here, the address detection circuit 28g includes a high pass filter (HPF) g1, a low pass filter (LPF) g2, a phase demodulation circuit g3, and an ADIP decoding circuit g4 as shown in FIG. 16 as an example. The high pass filter g1 removes a low frequency component contained in the wobble signal Swb. The low pass filter g2 removes a high frequency component contained in the output signal of the high pass filter g1. The phase demodulating circuit g3 demodulates the output signal of the low-pass filter g2 in synchronization with the reference clock signal Wck (see Japanese Patent Application Laid-Open No. 2001-052446). The ADIP decoding circuit g4 extracts address information from the output signal of the phase demodulation circuit g3, and decodes it into address data when the extracted address information reaches a predetermined amount (51 data bits in this case). The decoded address data is output to the CPU 40 as an address signal Sad.

  Returning to FIG. 1, the servo controller 33 generates a focus control signal for correcting a focus shift based on the focus error signal from the servo signal detection circuit 28b, and corrects the track shift based on the track error signal. A tracking control signal is generated. Each control signal generated here is output to the motor driver 27 when the servo is on, and is not output when the servo is off. Servo-on and servo-off are set by the CPU 40.

  The motor driver 27 outputs a focusing actuator drive signal to the optical pickup device 23 based on the focus control signal, and outputs a tracking actuator drive signal to the optical pickup device 23 based on the tracking control signal. That is, tracking control and focus control are performed by the servo signal detection circuit 28b, the servo controller 33, and the motor driver 27. The motor driver 27 outputs drive signals for the spindle motor 22 and the seek motor, respectively, based on a control signal from the CPU 40.

  The buffer RAM 34 has a buffer area for temporarily storing data to be recorded on the optical disk (recording data), data reproduced from the optical disk (reproduction data), and a variable area for storing various program variables. Have.

  The buffer manager 37 manages data input / output to / from the buffer RAM 34. Then, the CPU 40 is notified when the amount of data stored in the buffer area reaches a predetermined amount.

  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, performs data modulation and addition of an error correction code, and outputs a write signal to the optical disk 15. Generate. The write signal generated here is output to the laser control circuit 24 together with the correction reference clock signal Wck ′.

  The laser control circuit 24 generates a drive signal for the semiconductor laser LD based on the light emission characteristics of the semiconductor laser LD, the write signal from the encoder 25, the correction reference clock signal Wck ′, and the like. In other words, the power of the laser beam irradiated on the optical disk 15 is controlled.

  The interface 38 is a two-way communication interface with a host and, as an example, is compliant with the ATAPI (AT Attachment Packet Interface) standard.

  The flash memory 39 includes a program area and a data area, and a program written in a code readable by the CPU 40 is stored in the program area. In the data area, information related to the light emission characteristics of the semiconductor laser LD, information related to the seek operation of the optical pickup device 23 (hereinafter also referred to as “seek information”), recording conditions, and the like are stored.

  The CPU 40 controls the operation of each unit in accordance with a program stored in the program area of the flash memory 39, and stores data necessary for the control in the variable area of the buffer RAM 34 and the RAM 41.

《Delay amount acquisition processing》
Next, processing for obtaining the delay amount, which is performed when the optical disc 15 is loaded on the optical disc apparatus 20 configured as described above, will be described with reference to FIG. The flowchart in FIG. 17 corresponds to a series of processing algorithms executed by the CPU 40. When loading of the optical disk 15 is detected, the start address of the program corresponding to the flowchart of FIG. 17 is set in the program counter of the CPU 40, and the delay amount acquisition process starts. Here, it is assumed that the optical disc apparatus 20 supports a plurality of recording speeds. The lower linear velocity is set to be lower than the predetermined linear velocity, and the higher linear velocity is set to be equal to or higher than the predetermined linear velocity.

  In the first step 301, the position control of the optical pickup device 23 to the initial zone is instructed.

  In the next step 303, the first low speed side linear velocity is set. Then, a control signal for controlling the rotation of the spindle motor 22 is output to the motor driver 27 based on the set value.

  In the next step 305, when it is confirmed that the rotation of the optical disk 15 has reached the set linear velocity, the delay amount detection circuit 28h is instructed to detect the delay amount. Thus, the delay amount detection circuit 28h detects the delay amount as described above, and outputs the detection result to the CPU 40.

  In the next step 307, the detection result from the delay amount detection circuit 28h is stored in the RAM 41 in association with the linear velocity at that time.

  In the next step 309, it is determined whether or not there is a next low speed side linear velocity. For example, if there is a next low speed side linear velocity, the determination here is affirmed and the routine proceeds to step 311.

  In this step 311, the next low speed side linear velocity is set. Then, a control signal for controlling the rotation of the spindle motor 22 is output to the motor driver 27 based on the set value. Then, the process returns to Step 305.

  Thereafter, the processes in steps 305 to 311 are repeated until the determination in step 309 is denied.

  If there is no next low speed side linear velocity, the determination at step 309 is denied and the routine proceeds to step 313.

  In this step 313, the position control of the optical pickup device 23 to the guard zone 3 is instructed.

  In the next step 315, the initial high-speed side linear velocity is set. Then, a control signal for controlling the rotation of the spindle motor 22 is output to the motor driver 27 based on the set value.

  In the next step 317, when it is confirmed that the rotation of the optical disk 15 has reached the set linear velocity, the delay amount detection circuit 28h is instructed to detect the delay amount. Thus, the delay amount detection circuit 28h detects the delay amount as described above, and outputs the detection result to the CPU 40.

  In the next step 319, the detection result from the delay amount detection circuit 28h is stored in the RAM 41 in association with the linear velocity at that time.

  In the next step 321, it is determined whether or not there is a next high-speed side linear velocity. For example, if there is a next high-speed side linear velocity, the determination here is affirmed and the routine proceeds to step 323.

  In this step 311, the next high speed side linear velocity is set. Then, a control signal for controlling the rotation of the spindle motor 22 is output to the motor driver 27 based on the set value. Then, the process returns to Step 317.

  Thereafter, the processes in steps 317 to 323 are repeated until the determination in step 321 is denied.

  If there is no next high-speed linear velocity, the determination in step 321 is denied and the delay amount acquisition process is terminated.

<Recording process>
Next, processing (recording processing) in the optical disc apparatus 20 when a recording request command from the host is received will be briefly described with reference to FIG. The flowchart in FIG. 18 corresponds to a series of processing algorithms executed by the CPU 40. When a recording request command is received from the host, the start address of the program corresponding to the flowchart in FIG. 18 is set in the program counter of the CPU 40, and the recording process is performed. Starts.

  In the first step 501, a control signal for controlling the rotation of the spindle motor 22 based on the recording speed is output to the motor driver 27, and the reproduction signal processing circuit 28 is notified that a recording request command has been received from the host. . Further, the buffer manager 37 is instructed to store the data (recording data) received from the host in the buffer RAM 34.

  In the next step 503, when it is confirmed that the rotation of the optical disk 15 has reached a predetermined linear velocity, servo-on is set for the servo controller 33. Thereby, tracking control and focus control are performed as described above. Note that tracking control and focus control are performed as needed until the recording process is completed.

  In the next step 505, OPC (Optimum Power Control) is performed based on the recording speed to obtain the optimum recording power. That is, while changing the recording power stepwise, predetermined data is trial-written in a trial writing area called PCA (Power Calibration Area), and then the data is sequentially reproduced. For example, the asymmetry detected from the RF signal When the value almost coincides with a target value obtained in advance through experiments or the like, it is determined that the recording quality is the highest, and the recording power at that time is set as the optimum recording power.

  In the next step 506, a delay amount corresponding to the linear velocity of the recording velocity is extracted from the RAM 41. And it outputs to the delay correction circuit f4 as delay amount information.

  In the next step 507, the current address is acquired based on the address signal Sad.

  In the next step 509, a difference (address difference) between the current address and the target address extracted from the recording request command is calculated.

  In the next step 511, it is determined whether seek is necessary based on the address difference. Here, the threshold stored in the flash memory 39 is referred to as one of the seek information, and if the address difference exceeds the threshold, the determination here is affirmed and the routine proceeds to step 513.

  In step 513, a seek motor control signal corresponding to the address difference is output to the motor driver 27. As a result, the seek motor is driven to perform a seek operation. Then, the process returns to step 507.

  If it is determined in step 511 that the address difference does not exceed the threshold value, the determination here is denied and the process proceeds to step 515.

  In step 515, it is determined whether or not the current address matches the target address. If the current address does not match the target address, the determination here is denied and the routine proceeds to step 517.

  In step 517, the current address is acquired based on the address signal Sad. Then, the process returns to step 515.

  Thereafter, the processing from step 515 to step 517 is repeated until the determination at step 515 is affirmed.

  If the current address matches the target address, the determination at step 515 is affirmed, and the routine proceeds to step 519.

  In step 519, the encoder 25 is allowed to write. As a result, the recording data is written to the optical disk 15 via the encoder 25, the laser control circuit 24, and the optical pickup device 23. When all the recording data is written, a predetermined end process is performed, and then the recording process is ended.

《Reproduction processing》
Further, processing (reproduction processing) in the optical disc apparatus 20 when a reproduction request command is received from the host will be described with reference to FIG. The flowchart of FIG. 19 corresponds to a series of processing algorithms executed by the CPU 40. When a reproduction request command is received from the host, the start address of the program corresponding to the flowchart of FIG. Starts.

  In the first step 701, a control signal for controlling the rotation of the spindle motor 22 based on the reproduction speed is output to the motor driver 27, and the reproduction signal processing circuit 28 is notified that a reproduction request command has been received from the host. .

  In the next step 703, when it is confirmed that the rotation of the optical disk 15 has reached a predetermined linear velocity, servo-on is set for the servo controller 33. Thereby, tracking control and focus control are performed as described above. Note that tracking control and focus control are performed as needed until the reproduction process is completed.

  In the next step 705, the current address is acquired based on the address signal Sad.

  In the next step 707, a difference (address difference) between the current address and the target address extracted from the reproduction request command is calculated.

  In the next step 709, it is determined whether or not seeking is necessary in the same manner as in step 511. If a seek is necessary, the determination here is affirmed and the routine proceeds to step 711.

  In step 711, a seek motor control signal corresponding to the address difference is output to the motor driver 27. Then, the process returns to step 705.

  On the other hand, in step 709, if seek is not necessary, the determination here is denied and the routine proceeds to step 713.

  In this step 713, it is determined whether or not the current address matches the target address. If the current address does not match the target address, the determination here is denied and the routine proceeds to step 715.

  In step 715, the current address is acquired based on the address signal Sad. Then, the process returns to step 713.

  Thereafter, the processing from step 713 to 715 is repeated until the determination in step 713 is affirmed.

  If the current address matches the target address, the determination at step 713 is affirmed, and the routine proceeds to step 717.

  In step 717, the reproduction signal processing circuit 28 is instructed to read. Thus, the reproduction data is acquired by the reproduction signal processing circuit 28 and stored in the buffer RAM 34. This reproduced data is transferred to the host via the buffer manager 37 and the interface 38 in units of sectors. When the reproduction of the data designated by the host is completed, a predetermined termination process is performed and the reproduction process is terminated.

  As is clear from the above description, in the optical disc device 20 according to the present embodiment, a data recording unit is realized by the optical pickup device 23, the CPU 40, and a program executed by the CPU 40. However, it goes without saying that the present invention is not limited to this. That is, the above-described embodiment is merely an example, and a part of the data recording means realized by processing according to the program by the CPU 40 may be configured by hardware.

  Further, a signal correction means is realized by the delay amount detection circuit 28h and the delay correction circuit f4.

  As described above, according to the optical disc 15 according to the present embodiment, at the initial zone (specific area) PSN = 03000h to 023070h provided in the meandering groove G, the head of each ECC block is used as a reference mark. The groove G is not formed by a predetermined length from the position corresponding to the portion. Further, in PSN = 267940h to 2679C0h in the guard zone 3 (specific area), the groove G is not formed as a reference mark by a predetermined length from a position corresponding to the head portion of each ECC block. As a result, the reference position and the reference mark position in the meandering shape of the groove G have a predetermined positional relationship. For example, the wobble signal from the initial zone or the guard zone 3 of the optical disk 15 using the optical disk device is used. And the RF signal can be detected by detecting the delay amount of the wobble signal. Accordingly, as a result, it is possible to accurately predict the deviation of the recording position from the target position.

  Further, according to the optical disc apparatus 20 according to the present embodiment, when the optical disc 15 is loaded, the optical disc 15 is rotated at a predetermined linear velocity, and the wobble signal and the RF signal from the initial zone or the guard zone 3 are generated. In comparison, the delay amount of the wobble signal is detected. Then, when data is added to the optical disc 15, the reference clock signal is corrected based on the detected delay amount. Accordingly, it is possible to suppress the shift of the recording position with respect to the target position, and as a result, it is possible to perform recording with excellent recording quality on the optical disc of the present invention.

  In the above embodiment, the case where the groove G is not formed by a predetermined length from the position corresponding to the head portion of each ECC block as the reference mark has been described. However, the present invention is not limited to this. . For example, as shown in FIGS. 20 and 21, the reference mark may be recorded in the form of a pit. In this case, as the mark length, 3T to 11T and 14T (T: period of the channel clock) are used as data, so 2T or 15T is preferably used. Thereby, the reference mark can be detected with high accuracy. 20 and 21 show the case where the mark length is 15T. In this case, as shown in FIG. 22 as an example, in the delay amount detection circuit 28h, the delay amount Dt is calculated from the difference between the increase start position of the signal level of the RF signal and the 0 cross position of the wobble signal Swb. To detect.

  In the above embodiment, the case where the reference marks are formed in the initial zone and the guard zone 3 has been described. However, the present invention is not limited to this. For example, when the recording speed is low, the reference mark may be formed only in the initial zone. When the recording speed is high, the reference mark may be formed only in the guard zone 3.

  In the above embodiment, the case where the reference mark is formed in the initial zone PSN = 03000h to 023070h has been described, but the present invention is not limited to this.

  In the above embodiment, the case where the reference mark is formed in PSN = 267940h to 2679C0h of the guard zone 3 has been described, but the present invention is not limited to this.

  In the above embodiment, the case where the reference mark is formed in the initial zone on the inner peripheral side of the data zone DZ has been described, but the present invention is not limited to this.

  In the above embodiment, the case where the reference mark is formed in the guard zone 3 on the outer peripheral side of the data zone DZ has been described, but the present invention is not limited to this.

  In the above embodiment, the case where the reference mark is formed for each ECC block has been described. However, the present invention is not limited to this. For example, a reference mark may be formed every 2 ECC blocks.

  Moreover, although the said embodiment demonstrated the case where the meandering shape of the optical disk 15 was based on the DVD + R specification, this invention is not limited to this. You may comply with other standards.

  In the above embodiment, the case where the delay amount acquisition process is performed when the optical disk 15 is loaded has been described. However, for example, the delay amount acquisition process may be performed in response to a request from the host.

  In the above embodiment, the case where the delay amount information corresponding to the recording speed is notified from the CPU 40 to the delay correction circuit f4 at the time of data recording has been described. However, the present invention is not limited to this. Absent. For example, by adding a memory storing the relationship between the recording speed and the delay amount to the delay correction circuit f4, the delay amount may be determined on the delay correction circuit f4 side based on the recording speed information from the CPU 40. .

  In the above embodiment, when the delay amount corresponding to the designated linear velocity (designated linear velocity) is not stored in the RAM 41, the delay amounts corresponding to the different linear velocities stored in the RAM 41 are referred to. A predetermined calculation such as an approximation calculation or an interpolation calculation may be performed to estimate the delay amount at the specified linear velocity.

  Moreover, although the said embodiment demonstrated the case where the optical disk 15 respond | corresponds to several recording speed, you may respond | correspond not only to this but only a specific recording speed.

  Moreover, in the said embodiment, the temperature sensor for measuring the temperature of the optical pick-up apparatus 23 may be provided, and the delay amount may be calculated | required further according to temperature.

  In the above embodiment, the case where the groove G is an information recording track has been described. However, the land L may be an information recording track. In this case, a reference mark is formed as a pre-pit on the land L.

  In the above embodiment, the optical disk 15 corresponds to a laser beam having a wavelength of 660 nm. However, the present invention is not limited to this. For example, the optical disk 15 may correspond to a laser beam having a wavelength of about 405 nm.

  In the above embodiment, the optical disk apparatus capable of recording and reproducing data has been described. However, the present invention is not limited to this, and any optical disk apparatus capable of recording data at least among data recording, reproduction and erasure may be used. .

  Moreover, although the said embodiment demonstrated the case where the said optical pick-up apparatus 23 was provided with one semiconductor laser, you may provide not only this but the several semiconductor laser which light-emits the light beam of a mutually different wavelength, for example. 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. In short, it is sufficient that at least the optical disk of the present invention can be supported.

  In the above embodiment, the case where the interface 38 conforms to the ATAPI standard has been described. However, the present invention is not limited to this. For example, ATA (AT Attachment), SCSI (Small Computer System Interface), USB (Universal Serial Bus) 1 , USB 2.0, IEEE 1394, IEEE 802.3, serial ATA, and serial ATAPI.

1 is a block diagram showing a configuration of an optical disc device according to an embodiment of the present invention. It is sectional drawing for demonstrating the structure of the optical disk which concerns on one Embodiment of this invention. It is a figure for demonstrating the meandering shape in the optical disk of FIG. It is a figure for demonstrating the structure of an information frame. 5A and 5B are diagrams for explaining the meandering shape of the ADIP information section. 6A and 6B are diagrams for explaining the meandering shape of the synchronization information section. It is a figure for demonstrating the data bit of an ADIP information part. It is a figure for demonstrating the layout (single session) of the information area in DVD + R. It is a figure for demonstrating an inner drive area. It is a figure for demonstrating an outer drive area. It is a figure for demonstrating the reference mark formed in the initial zone. FIG. 4 is a diagram for explaining reference marks formed in a guard zone 3. It is a figure for demonstrating the structure of the optical pick-up apparatus in FIG. FIG. 2 is a block diagram for explaining a configuration of a reproduction signal processing circuit in FIG. 1. It is a timing chart for demonstrating the effect | action of the delay amount detection circuit of FIG. FIG. 15 is a block diagram for explaining a configuration of a clock generation circuit and an address detection circuit in FIG. 14. It is a flowchart for demonstrating the process which acquires the delay amount of a wobble signal. It is a flowchart for demonstrating the recording process in the optical disk device performed according to the recording request command from a host. 10 is a flowchart for explaining a reproduction process in the optical disc apparatus performed in response to a reproduction request command from a host. It is a figure for demonstrating the reference mark formed by the prepit in the initial zone. FIG. 5 is a diagram for explaining a reference mark formed by pre-pits in a guard zone 3; It is a timing chart for demonstrating an effect | action of the delay amount detection circuit when a reference mark is a prepit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 15 ... Optical disk, 20 ... Optical disk apparatus, 23 ... Optical pick-up apparatus (a part of data recording means), 28h ... Delay amount detection circuit (a part of signal correction means), 40 ... CPU (a part of data recording means), f4: Delay correction circuit (a part of the signal correction means).

Claims (10)

  It has a recording surface on which spiral or concentric meandering recording tracks are formed, and a predetermined reference mark is formed at the head position of at least one of the addresses allocated to a specific area of the track. Optical disc.   2. The optical disc according to claim 1, wherein the specific area is an area included in an area on the inner circumference side of a data area in which user data is recorded.   2. The optical disc according to claim 1, wherein the specific area is an area included in an outer peripheral area with respect to a data area in which user data is recorded.   2. The track according to claim 1, wherein the track is provided in a guide groove formed in a spiral shape or a concentric shape, and the reference mark is formed by not forming the guide groove by a predetermined length. The optical disk as described in any one of -3.   The optical disk according to claim 1, wherein the reference mark is a pit having a predetermined length.   6. The optical disc according to claim 5, wherein the length of the pit is different from the length of a pit used for recording user data.   The optical disc according to claim 6, wherein the reference mark is formed for each recording unit.   The optical disc according to claim 7, wherein the recording unit is one ECC block. An optical disc apparatus having the optical disc according to any one of claims 1 to 8 as a data recording target medium,
Data recording means for recording data in a data area of the optical disc in synchronization with a reference clock signal;
Signal correction means for detecting the reference mark and the wobble signal from a specific area of the optical disc, obtaining a delay amount of the wobble signal based on the detection result, and correcting the reference clock signal based on the delay amount; An optical disc device comprising: 10. The optical disc apparatus according to claim 9, wherein the signal correction unit detects the reference mark based on an RF signal obtained from the specific area.

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