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WO2007013144A1 - Dispositif de disque optique et circuits integre a semi-conducteur - Google Patents

Dispositif de disque optique et circuits integre a semi-conducteur Download PDF

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Publication number
WO2007013144A1
WO2007013144A1 PCT/JP2005/013706 JP2005013706W WO2007013144A1 WO 2007013144 A1 WO2007013144 A1 WO 2007013144A1 JP 2005013706 W JP2005013706 W JP 2005013706W WO 2007013144 A1 WO2007013144 A1 WO 2007013144A1
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WO
WIPO (PCT)
Prior art keywords
circuit
optical disc
frequency
data
data processing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2005/013706
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English (en)
Japanese (ja)
Inventor
Yoshimi Iso
Mitsuo Hagiwara
Masato Soma
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renesas Technology Corp
Original Assignee
Renesas Technology Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renesas Technology Corp filed Critical Renesas Technology Corp
Priority to PCT/JP2005/013706 priority Critical patent/WO2007013144A1/fr
Priority to JP2007526770A priority patent/JPWO2007013144A1/ja
Publication of WO2007013144A1 publication Critical patent/WO2007013144A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
    • G11B7/0037—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • G11B19/28—Speed controlling, regulating, or indicating

Definitions

  • the present invention relates to an optical disc apparatus capable of recording / reproducing information with respect to an optical disc, and further to a semiconductor integrated circuit for controlling recording / reproduction of information with respect to an optical disc device.
  • the present invention relates to a technology that makes it possible to form visible information such as titles and photographs on the label surface of optical discs.
  • CD-R, CD-RW, DVD-R, DVD-RW, etc. are widely used as recordable optical disks.
  • grooves (groups) that record information on the disc are meandered (wobbled) at a predetermined period, and the position on the disc is modulated by modulating the period of this wobbling (hereinafter referred to as wobble).
  • V configured to allow detection.
  • a wobble signal obtained from an optical disk by an optical disk device that performs recording and playback on the optical disk becomes an FM signal having a frequency of 22.05 kHz ⁇ l kHz when the linear velocity in the recording group is a constant standard speed.
  • the center value of the FM signal frequency 22 is 22.
  • 05 kHz is set to 1/196 of the recording bit rate, 4.3218 MHz.
  • CLV control is achieved that keeps the linear velocity constant at the laser light irradiation spot by controlling the rotation of the motor so that the center frequency of the extracted wobble signal is 22.05 kHz during recording. can do.
  • the recording bit rate is 196 times the center frequency of the wobble signal
  • the PLL circuit 196 times the clock frequency is generated, and a clock synchronized with the wobble signal is generated and used as a reference clock signal for recording. This makes it possible to accurately record information at a position on the disc.
  • a recording reference clock signal is generated by a PLL circuit based on a wobble signal during recording, and a rotation signal is generated by generating a spindle motor control signal.
  • Patent Document 1 Japanese Patent Laid-Open No. 2002-230757
  • Patent Document 2 Japanese Patent Laid-Open No. 10-293926
  • the CD—scale can be up to 48 times faster (CAV control with a constant rotation speed of 20 times the innermost circumference and 48 times the outermost speed), DVD— In R, the maximum speed is 16 times, and both of them have a rotational speed of less than 10000 rpm (lOOOOrpm).
  • the rotation speed is lowered to increase the reliability of the read signal, but even in this case, the minimum speed is about 4 times the CD speed, that is, less than 2000 rpm. It is.
  • the rotation range of the spindle motor that drives the optical disk is about 5 times from 2000 rpm to lOOOO rpm, for example. In such a rotation range, the rotation control without any problem in the rotation quality of the spindle motor is normally performed, and the position of the recording data is not disturbed.
  • the optical disc device In addition to the operation of recording data on the signal surface of the disc, the optical disc device is coated with a laser-sensitive paint on the label surface of the optical disc and irradiated with the same laser light as that for optical recording.
  • Laser label printing that records titles, pictures, and photographs has been proposed.
  • the recording speed is determined by the photosensitivity of the photosensitive material coated on the label surface and the writing laser power.
  • the photosensitivity is increased too much, it becomes weak against visible light and heat, resulting in deterioration after printing.
  • laser power exceeding the maximum power for recording CD-R and CD-RW cannot be used in terms of cost.
  • the linear velocity is about 3 OcmZsec, and the limit is about one-fourth of the standard speed of CD (1.3 mZsec). For this reason, the linear velocity is as stable as possible from the inner circumference to the outer circumference! It is desirable to perform the recording of V).
  • the motor speed decreases as it advances from the inner circumference to the outer circumference.
  • the motor for high-speed rotation is light in weight and has high current sensitivity, it does not rotate smoothly at low-speed rotation and tends to cause cogging that causes momentary rotation unevenness.
  • the motor rotation speed often changes unexpectedly.
  • the interval of uniform data becomes wider, and in places where it turns slowly, the interval is narrowed and the picture and characters are distorted.
  • An object of the present invention is to provide a technique for preventing visible information recording quality from being deteriorated by laser irradiation on a label surface of an optical disk even when cogging is generated by a low-speed rotation of a motor that rotates the optical disk. It is in.
  • the optical disc apparatus (1) controls the irradiation of laser light to enable recording and reading of data on one surface of the optical disc (2) and to control the irradiation of laser light. This makes it possible to record visible information (laser label printing) on the other side of the optical disk.
  • This optical disc apparatus has a detector (7) for detecting information corresponding to the rotational speed from the other side of the rotating optical disc, and a data bit rate of a recording operation by laser light irradiation.
  • a clock generation circuit (17) for generating a reference clock signal (CLK) for determination and a data processing circuit (13, 14) are provided.
  • the data processing circuit When the data processing circuit forms the visible information, the data processing circuit performs the processing for the clock generation circuit according to an error between a speed obtained from the detection information of the detector force and a target speed of the optical disc with respect to a laser beam irradiation spot.
  • Change the reference clock signal frequency setting From the above, after the control circuit sets the frequency of the reference clock signal, even if the rotation of the optical disk becomes uneven due to the cogging of the motor that rotates the optical disk, the control circuit tracks the reference clock signal. Since the frequency is changed, the data bit rate of the recording operation by the laser beam irradiation by the reference clock signal in the laser label printing can follow the change of the linear velocity of the irradiation spot.
  • the interval between print data on the label surface does not increase even when the motor rotates fast, and the interval does not clog even when the motor rotates slowly, and the darkness of the print does not distort the picture or character. There will be no unevenness. It is not necessary to increase the inertia by increasing the rotor weight of the motor, and the heat generation and cost of the motor will not increase.
  • the data processing circuit when forming the visible information, controls the rotation of the optical disc so that the linear velocity is constant with respect to the laser beam irradiation spot.
  • the recording speed of visible information is determined by the sensitivity of the photosensitive material applied to the label surface and the writing laser power. Therefore, it is the best force to perform recording at a constant linear velocity (CLV) from the inner circumference to the outer circumference at a linear velocity of about 30 cmZsec.
  • the data processing circuit when the data processing circuit records the data, the data processing circuit rotates the optical disk so that the linear velocity is constant with respect to the laser beam irradiation spot.
  • the frequency of the reference clock signal is set to be constant in the clock generation circuit corresponding to the linear velocity.
  • the data processing circuit when performing recording of the data, uses an optical disc so that an angular velocity is constant with respect to a laser beam irradiation spot. And the clock generation circuit setting is changed so that the frequency of the reference clock signal changes in response to a gradual change in the linear velocity of the optical disc with respect to the irradiation spot.
  • the optical disk is driven to rotate at a constant angular velocity when data recording is performed, the linear velocity increases as the laser beam irradiation spot moves closer to the outer periphery, and it is necessary to increase the frequency of the reference clock signal accordingly.
  • the frequency setting of the reference clock signal is set according to the error from the target velocity when recording visible information.
  • the control mode that changes the difference in the starting point of the idea such as the state of the motor of interest and the purpose of control.
  • the data processing circuit changes the frequency of the clock signal in accordance with a moving average of the error for each circumferential position of the optical disk. As a result, the visible information formed when cogging occurs can be made more uniform.
  • the clock generation circuit includes a PLL circuit (21) including a variable frequency dividing circuit in a loop, and the data processing circuit Frequency division ratio control data (C GC) for changing the clock frequency in accordance with the error rate is supplied to the PLL circuit.
  • PLL circuit (21) including a variable frequency dividing circuit in a loop
  • C GC Frequency division ratio control data
  • the data processing circuit when the error with respect to the target speed exceeds a predetermined threshold, changes the clock frequency according to the error. Ignoring slight errors is a force that may contribute to uniform visual information.
  • the semiconductor integrated circuit (6) controls the irradiation of the laser beam to enable data recording and reading control on one surface of the optical disc, and controls the irradiation of the laser beam. Thus, control for recording visible information on the other surface of the optical disk is made possible.
  • This semiconductor integrated circuit has a clock generation circuit (17) for generating a reference clock signal (CLK) for determining the data bit rate of the recording operation by laser light irradiation, and a data processing circuit (13, 14). .
  • CLK reference clock signal
  • the data processing circuit rotates when forming the visible information.
  • Optical disk force to be used The setting of the reference clock signal frequency for the clock generation circuit is changed according to an error between the detected rotation speed and the target speed of the optical disk with respect to the laser beam irradiation spot.
  • this semiconductor integrated circuit even if cogging occurs in the motor that rotates the optical disk and the linear velocity of the laser beam irradiation spot changes, the frequency of the reference clock signal can be changed following the change.
  • the data processing circuit when forming the visible information, controls the rotation of the optical disc so that the linear velocity is constant with respect to the laser beam irradiation spot. .
  • the data processing circuit controls the rotation of the optical disc so that the linear velocity is constant with respect to the laser light irradiation spot, and the data processing circuit corresponds to the linear velocity.
  • the frequency of the reference clock signal is set to be constant in the clock generation circuit.
  • the data processing circuit controls the rotation of the optical disc so that the angular velocity is constant with respect to the irradiation spot of the laser beam, and the linear velocity of the optical disc with respect to the irradiation spot gradually changes.
  • the setting of the clock generation circuit is changed so that the frequency of the reference clock signal changes correspondingly.
  • the data processing circuit changes the frequency of the clock signal according to the moving average of the error for each circumferential position of the optical disk.
  • the clock generation circuit includes a PLL circuit including a variable frequency dividing circuit in a loop, and the data processing circuit includes the error relative to the target speed.
  • the division ratio control data for changing the clock frequency in accordance with the ratio is supplied to the PLL circuit.
  • the data processing circuit when the error with respect to the target speed exceeds a predetermined threshold, changes the clock frequency according to the error.
  • a semiconductor integrated circuit (6) from still another aspect controls laser beam irradiation.
  • This semiconductor integrated circuit has a clock generation circuit (17) for generating a reference clock signal (CLK) for determining a data bit rate of a recording operation by laser light irradiation, and a data processing circuit (13, 14).
  • the clock generation circuit has a PLL circuit (21) provided with a variable frequency dividing circuit in the loop.
  • the division ratio control data is generated according to an error between the rotation speed detected by the rotating optical disk force and the target speed of the optical disk with respect to the irradiation spot of the laser beam. This is applied to the PLL circuit to change the frequency of the reference clock signal.
  • FIG. 1 is a block diagram showing an example of an optical disk device.
  • FIG. 2 is a block diagram showing an example of a PLL circuit.
  • FIG. 3 is an explanatory diagram showing a spindle motor rotation control loop and a reference clock signal CLK generation control loop extracted for the printing operation on the label surface in the configuration of FIG.
  • FIG. 4 is an explanatory diagram of spokes formed on the inner periphery of an optical disc.
  • FIG. 5 is an explanatory view illustrating the configuration of a detector that detects the rotation of the spokes.
  • FIG. 6 is an explanatory diagram of a rotational speed deviation caused by cogging.
  • FIG. 7 Generation of reference clock signal CLK according to a comparative example in which reference clock signal CLK is set to a fixed frequency without reflecting the state change of pulse OFG in the reference clock signal generation loop when CLV control is assumed It is explanatory drawing which shows a control loop.
  • FIG. 8 In order to control the frequency of the reference clock signal by the division ratio control data using the moving average of the deviation for each circumferential position of the optical disc, the pulse signal OFG is controlled at each pulse position. It is explanatory drawing which shows the state which memorize
  • FIG. 9 is a flowchart showing a specific example of a label printing control procedure. Explanation of symbols
  • SPNC Spindle motor control circuit
  • LCTD Location information detection circuit
  • VCO Voltage controlled oscillator
  • VDIV Variable divider
  • ISEL Input selector
  • FIG. 1 shows an example of an optical disk device.
  • the optical disc apparatus 1 controls the laser beam irradiation to enable data recording and reading on the data recording surface of the optical disc 2, and controls the laser beam irradiation to record visible information on the label surface of the optical disc. (Laser label printing) is enabled.
  • the optical disk device 1 includes a spindle motor (SPN) 3, a pickup unit (PU) 4, a recording control unit (RCDC) 5, a single-chip microcomputer (MCU) 6 integrated into a semiconductor integrated circuit, and an optical disk used for label printing. It has a rotation detector (PH O) 7.
  • the pickup unit 4 and the recording control unit 5 constitute an analog front end.
  • the microcomputer 6 includes a spindle motor control circuit (SPNC) 10 that controls the rotation speed of the spindle motor 3, a recording data generation circuit (RCDDG) 11, a reproduction signal processing circuit (S IGLP) 12, and a controller (MCNT) 13 , A rotation speed deviation detection circuit (DEVAT) 14, a wobble signal extraction circuit (WOBL) 15, a position information detection circuit (LOCTD) 16, a clock generation circuit (CPG) 17, and an interface circuit (EXTIF) 18.
  • the controller 13 and the rotational speed deviation detection circuit 14 are constituted by a central processing unit, its peripheral circuits, and an operation program for the central processing unit.
  • the recording data generation circuit 11, the reproduction signal processing circuit 12, the wobble signal extraction circuit 15, and the position information detection circuit 16 are constituted by a digital signal processing unit, a central processing layer device, and its operation program.
  • the interface circuit 18 is connected to a host device.
  • the controller 13 receives a host device command (not shown) and controls a recording operation, a reproducing operation, or a laser label printing operation.
  • the controller 13 is also instructed to perform a recording operation by the host device through the interface circuit 18. Then, the recording information supplied from the host device is supplied to the recording data generation circuit 11.
  • the recording data generation circuit 11 performs recording, modulation, etc. on the recording information in accordance with an instruction from the controller 13 to generate recording data and output it to the recording control circuit 5.
  • the recording control circuit 5 generates a control signal for controlling the power and emission waveform of the laser beam of the pickup unit 4 so that information can be recorded on the optical disc 2 based on the supplied recording data. Supplied to pickup section 4.
  • the recording data generation circuit 11 and the recording control circuit 5 are supplied with a recording reference clock signal CLK from the clock generation circuit 17, and the recording operation in these circuits 5 and 11 is performed in synchronization with the reference clock signal CLK. Is called.
  • the pickup unit 4 records data by irradiating a laser of power necessary for recording toward the optical disc 2 based on the input control signal. In parallel with this recording operation, the pickup unit 4 detects the reflected light from the optical disc 2 and supplies it to the reproduction signal processing circuit 12 as a reproduction signal at the time of recording.
  • the reproduction signal processing circuit 12 extracts a reproduction signal power, for example, a push-pull signal, and outputs the extracted signal to the wobble extraction circuit 15 and the position information detection circuit 16.
  • the wobble extraction circuit 15 extracts a wobble signal component from the input push-pull signal cable and outputs it to the spindle motor control circuit 10 and the clock generation circuit 17 as a wobble signal ⁇ WBL.
  • the spindle motor control circuit 10 detects the number of rotations of the optical disk 2 from the supplied wobble signal ⁇ WBL and controls the spindle motor 3 so that the number of rotations becomes a desired value.
  • the controller 13 instructs the control mode of the rotational speed control for the spindle motor control circuit 10. For example, when CLV control is performed in which the linear velocity of the optical disc 2 with respect to the pickup unit 4 is constant, the spindle motor 3 is controlled so that the frequency of the wobble signal 0 WBL becomes the specified 22.05 kHz.
  • the position information detection circuit 16 extracts and detects position information from the push-pull signal input from the reproduction signal processing circuit 12, detects the absolute position on the optical disc 2, and outputs it to the controller 13.
  • the clock generation circuit 17 generates a reference clock signal CLK synchronized with the supplied wobble signal ⁇ WBL.
  • the reference clock signal CLK is input to the position information detection circuit 16 and used for determining timing for detecting position information.
  • the reference clock signal CLK is also supplied to the recording data generation circuit 6 and the recording control circuit 5, and is used as a clock signal for determining the data bit rate of the recording operation by laser light irradiation.
  • the clock generation circuit includes an oscillation circuit (OSC) 20 and a PLL circuit (PLL) 21.
  • the transmission circuit (OSC) 20 outputs a clock signal of 4.3218 MHz, which is a data recording bit rate in CD-RW, although not particularly limited.
  • the PLL circuit 21 includes a phase comparator (PCOMP) 22, a low-pass filter (LPF) 23, a voltage controlled oscillator (VCO) 24, a variable frequency divider (VDIV) 25, and an input selector. (ISEL) Consists of 26.
  • PCOMP phase comparator
  • LPF low-pass filter
  • VCO voltage controlled oscillator
  • VDIV variable frequency divider
  • ISEL input selector Consists of 26.
  • the input selector 26 selects the wobble signal ⁇ WBL supplied from the wobble signal extraction circuit 15 and supplies it to the phase comparator 22.
  • the input selector 26 selects the output clock signal ⁇ S of the transmission circuit 20 and supplies it to the phase comparator 22.
  • the frequency dividing ratio of the variable frequency divider 25 is controlled by the controller 13 in the data writing operation, and is controlled by the rotation speed deviation detecting circuit 14 in the printing operation on the label surface. Both control data are shown as CGC.
  • the wobble signal ⁇ WBL to which the power of the wobble signal extraction circuit 15 is also supplied is selected by the selector 26 and input to the phase comparator 22 and phase-compared with the output of the frequency divider 25.
  • the frequency divider 25 receives the output of the voltage controlled oscillator 24, that is, the output clock CLK of the PLL circuit, and the frequency division ratio is set so as to have the same frequency as the wobble signal 0 WBL.
  • the phase comparator 22 performs phase comparison between the wobble signal ⁇ WBL and the divided output of the output clock signal CLK.
  • the phase comparator 16 generates an error voltage corresponding to the phase error, for example. Is output.
  • the high-frequency noise component is removed by the low-pass filter 23, and only the low-frequency component is supplied to the voltage-controlled oscillator 24.
  • the voltage controlled oscillator 24 changes the oscillation frequency according to the supplied error voltage, and changes the frequency of the output clock signal CLK.
  • the PLL circuit 21 operates so that the error between the wobble signal ⁇ WBL and the output of the frequency divider 25 is eliminated.
  • the reference clock signal CLK synchronized with the input wobble signal 0 WBL is generated.
  • the output clock signal CLK of the PLL circuit 21 is set to the standard speed by setting the divider ratio to 186. At a recording bitrate of Yes 4. Matched to 3218MHz.
  • the pickup 4 is controlled so as to irradiate the optical disc 2 with a laser having a power necessary for reproduction, and the reflected light from the optical disc 2 is detected and reproduced.
  • the signal is supplied to the reproduction signal processing circuit 12 as a signal.
  • the reproduction signal processing circuit 12 restores the recorded information of the supplied reproduction signal power and outputs the reproduction information to the outside through the interface circuit 18.
  • FIG. 3 shows the rotation control loop of the spindle motor and the generation control loop of the reference clock signal CLK for the printing operation on the label surface in the configuration of FIG.
  • the wobble signal cannot be extracted by the printing operation on the label surface. This is because there is no track to be recorded on the label surface, and a meandering groove capable of extracting a wobble signal is formed.
  • a spoke 30 formed on the inner periphery of the optical disk 2 as illustrated in FIG. 4 is used for the rotation control of the optical disk accompanying the printing of the label surface.
  • Spoke 30 consists of 400 equi-pitch mirrors. As illustrated in FIG.
  • the detector 7 is disposed immediately below the spoke 30, receives a light emitting diode (LED) 31 that irradiates the mirror of the spoke 30 with emitted light, and receives reflected light from the mirror. And a photodiode (PD) 32.
  • a pulse signal (OFG) having a period corresponding to the rotation speed can be obtained from the photodiode 32.
  • the recording speed with respect to the label surface is determined by the sensitivity of the photosensitive material coated on the label surface and the writing laser power.
  • the sensitivity is increased too much, it becomes weak against visible light and heat, and after printing.
  • Use of a laser with the maximum power or higher that records CD-RW etc. is disadvantageous in terms of cost.
  • the linear velocity is about 30 cmZsec and the limit of about one-fourth of the standard speed of CD (1.3 mZsec) is considered. Taking this into account, it is a good idea to print at a constant linear velocity (CLV) to the outer periphery of the inner surface force for printing on the label surface.
  • CLV constant linear velocity
  • the positioning in the radial direction can be controlled by the number of drive motors of the threading stepping motor (not shown) that moves the pickup 4 in the radial direction.
  • the current radial position of the pickup 4 stores the number of tracks in the innermost peripheral force, and the radius of the track position is calculated by this. Linear velocity at that radius Calculate a constant rotation speed.
  • the rotational speed of the motor 3 may be controlled so that the pulse width of the pulse signal OFG becomes a target pulse width. More specifically, the controller 8 memorizes how many tracks the innermost peripheral force is in the radial position of the current pickup 4, and calculates the radius of the track position based on this.
  • the spindle motor control circuit 10 inputs the controller 8 force radius position information PUP and calculates the target period of the pulse signal OFG for the rotational force per unit time for making the linear velocity constant at the radius.
  • the spindle motor control circuit 10 counts the clock signal every period of the output pulse OFG of the photodetector 32 and controls the rotation speed so that the period of the output pulse OFG becomes the target period.
  • the host device Since the spindle motor 3 is driven to rotate by CLV control in laser label printing, the host device records data for each radius position in synchronization with a fixed reference clock in the calculation of recording data for label printing. Assuming The print data thus calculated is supplied via the interface circuit 18 and stored in a data buffer (not shown). The recording control circuit 5 performs laser irradiation at the clock cycle specified by the print data. The irradiation time is determined according to the cycle of the reference clock signal CLK. In order to obtain good print quality, it is necessary that the correlation between the period of the reference clock signal CLK and the linear velocity of the optical disk is maintained as intended.
  • the rotational speed deviation detection circuit 14 inputs the output OFG of the photodetector 32 and calculates the period of the pulse signal OFG based on the output clock signal.
  • the controller 8 memorizes how many tracks the innermost circumferential force of the current pickup 4 is in the radial direction, thereby calculating the radius of the track position, and the unit for making the linear velocity constant at the radius.
  • Rotational power per hour Calculate the target period of the pulse signal OFG.
  • the rotation speed deviation detection circuit 14 counts the clock signal for each period of the output pulse OFG of the photodetector 32, and the error between the period of the output pulse OFG and the target period, that is, the speed obtained by the output pulse OFG from the photodetector 32.
  • the frequency division ratio control data CGC to the PLL circuit 21 is changed in accordance with an error between the reference clock signal CLK and the target clock speed to change the frequency of the reference clock signal CLK. For example, as the error, a value obtained by dividing the period of the output pulse FG by the target period is grasped as a deviation.
  • the error a value obtained by dividing the cycle of the output pulse OFG by the target cycle is grasped as a deviation, and the deviation for each pulse of the pulse signal OFG is stored for a plurality of rotations, and the pulse position, that is, the optical disc
  • the frequency of the reference clock signal CLK is controlled by the frequency division ratio control data CGC using a moving average of deviations at respective positions in the circumferential direction. For example, as shown in FIG. 8, for the pulse position of the pulse signal OFG corresponding to the positions of the 400 mirrors of the spoke 30, the deviation for three consecutive times from the latest is stored.
  • the average of three deviations is used to control the frequency of the reference clock signal CLK using the division ratio control data CGC.
  • moving average it is possible to control the frequency by taking into account the past past conditions, which contributes to further uniformizing the visible information formed when cogging occurs. Can do.
  • the deviation data may be stored in a work memory not shown in the rotation speed deviation detection circuit 14.
  • the frequency control of the reference clock signal CLK is performed only when the average deviation value exceeds a predetermined threshold value.
  • the frequency control of the reference clock signal CLK by the division ratio control data CGC is performed only when the average deviation is ⁇ 1% or more. It is also the power that neglecting slight errors often contributes to uniform visual information by label printing. In the case of Fig. 8, when the OFG cycle number is 5, 6, or 7, frequency control of the reference clock signal CLK is performed.
  • FIG. 9 illustrates a label printing control flowchart.
  • the information given from the host device for example, the linear velocity of the optical disc 2 with respect to the laser spot from the pickup 4 is 25 cm, and the virtual track pitch when label printing is performed. Is 42 m, the starting radius is 25 mm, and the final number of tracks is 714 (S1).
  • the division ratio control data CGC corresponding to the average value is generated and set in the PLL circuit 21, and the frequency of the reference clock signal CLK is set. Change (S11). Subsequently, the OFG counter is incremented by +1 to perform the same processing for the pulse with the next OFG pulse cycle number (S 12), and it is determined whether or not the force has reached the final pulse number 400 (S13). Repeat steps S7 to S13 until number 400 is reached. Last pulse number When reaching 400, the number of tracks is incremented by +1 (S14), and the processing of steps S2 to S14 is repeated until the processing for the last track is completed (S15).
  • a certain range for example, ⁇ 1%
  • the optical disc may be a disc capable of recording and reproducing information by laser irradiation, such as CD-R, DVD-R, DVD-RAM, and the like.
  • the linear speed of label printing at 30 cmZsec is a representative example and can be changed as appropriate.
  • the PLL circuit is not limited to a digital PLL circuit, and an analog PLL circuit can also be used.
  • the controller 13 and the rotation speed deviation detection circuit 14 are configured by the CPU and peripheral circuits and their operation programs, there are cases where the actual hardware cannot be clearly distinguished. If the rotation speed deviation detection circuit 14 is configured with dedicated hardware, the burden on the CPU can be reduced.
  • the present invention can be applied to an optical disk drive positioned as a peripheral device of a PC (personal computer) such as a CD-R, DVD-R, or DVD-RAM as a recording medium. It can also be applied to DVD recorders.
  • PC personal computer

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  • Optical Recording Or Reproduction (AREA)

Abstract

La présente invention concerne un dispositif de disque optique (1) enregistrant et lisant des données sur la face d'un disque optique par commande de rayonnement d'un faisceau laser et enregistrant des informations visibles sur l'autre face de ce disque optique par commande du rayonnement de ce faisceau laser. Ce dispositif de disque optique comprend un détecteur (7) qui détecte des informations correspondant à une vitesse de rotation, à partir de l'autre face du disque optique en rotation (2), un circuit générateur d'horloge (17) qui génère un signal d'horloge de référence afin de déterminer un débit binaire de données d'une opération d'enregistrement par rayonnement de faisceau laser et, des circuits de traitement de données (13, 14). Ces circuits de traitement de données permettent au circuit générateur d'horloge de modifier la fréquence du signal d'horloge de référence correspondant à une erreur entre une vitesse obtenue par la détection d'informations en provenance du détecteur et la vitesse cible, au moment de la formation des informations visibles. Même lorsque des phénomènes de hachures sont générés à cause d'une rotation trop lente du moteur de disque lorsque qu'une image visible est formée, la corrélation entre la rotation du disque et la fréquence d'horloge de référence peut être conservée et la qualité de formation d'images peut être maintenue.
PCT/JP2005/013706 2005-07-27 2005-07-27 Dispositif de disque optique et circuits integre a semi-conducteur Ceased WO2007013144A1 (fr)

Priority Applications (2)

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PCT/JP2005/013706 WO2007013144A1 (fr) 2005-07-27 2005-07-27 Dispositif de disque optique et circuits integre a semi-conducteur
JP2007526770A JPWO2007013144A1 (ja) 2005-07-27 2005-07-27 光ディスク装置及び半導体集積回路

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US11311688B2 (en) 2015-12-28 2022-04-26 Rai Strategic Holdings, Inc. Aerosol delivery device including a housing and a coupler

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JP2002251862A (ja) * 2001-02-26 2002-09-06 Ricoh Co Ltd 記憶メディアとこれを用いる情報記録再生装置
JP2005050409A (ja) * 2003-07-30 2005-02-24 Yamaha Corp 光ディスク装置
JP2005317104A (ja) * 2004-04-28 2005-11-10 Toshiba Corp 光ディスク装置

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JP3956756B2 (ja) * 2001-10-31 2007-08-08 ヤマハ株式会社 光ディスク記録装置
JP2004014082A (ja) * 2002-06-11 2004-01-15 Takamichi Takatsu 光ディスク書込装置、光ディスク書込方法

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JP2002251862A (ja) * 2001-02-26 2002-09-06 Ricoh Co Ltd 記憶メディアとこれを用いる情報記録再生装置
JP2005050409A (ja) * 2003-07-30 2005-02-24 Yamaha Corp 光ディスク装置
JP2005317104A (ja) * 2004-04-28 2005-11-10 Toshiba Corp 光ディスク装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11311688B2 (en) 2015-12-28 2022-04-26 Rai Strategic Holdings, Inc. Aerosol delivery device including a housing and a coupler

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