WO2006011375A1 - 光ディスク記録再生装置の信号生成回路 - Google Patents
光ディスク記録再生装置の信号生成回路 Download PDFInfo
- Publication number
- WO2006011375A1 WO2006011375A1 PCT/JP2005/013071 JP2005013071W WO2006011375A1 WO 2006011375 A1 WO2006011375 A1 WO 2006011375A1 JP 2005013071 W JP2005013071 W JP 2005013071W WO 2006011375 A1 WO2006011375 A1 WO 2006011375A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- recording
- receiving element
- optical disc
- light receiving
- Prior art date
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/005—Reproducing
- G11B7/0053—Reproducing non-user data, e.g. wobbled address, prepits, BCA
Definitions
- the present invention relates to a signal generation circuit of an optical disc recording / reproducing apparatus, and more particularly to a signal generation circuit during data recording.
- an optical disk recording / reproducing apparatus a laser beam of an optical pickup is irradiated onto a signal surface of an optical disk, the reflected light is received by a four-divided light receiving element, and the output of this four-divided light receiving element is IV-converted, By taking the difference between the predetermined light receiving element outputs, for example, an error signal used for actuator control such as a focus error signal and a tracking error signal is generated, or a wobble signal used for acquiring address information is generated. ing.
- An optical disc recording / reproducing apparatus records data on a recordable optical disc using these error signals and a wobble signal, or reproduces data recorded on a recordable optical disc.
- a servo circuit is formed so as to drive the focus coil and tracking coil of the optical pickup actuator via a phase compensation circuit and a drive circuit. If the wobble signal is used, the address information necessary to accurately control the position of the optical pickup and the rotation control of the spindle motor at the time of recording and reproduction of the recordable optical disk is acquired to a predetermined position. While moving the optical pickup, the number of rotations of the motor is controlled using information necessary for the rotation control of the optical disk included in the wobble signal, and the pits are recorded accurately.
- the laser beam power is constant, but CD-R, RW, DV
- the laser beam power changes because the laser beam from the optical pickup forms a pit train of EFM signals.
- the loop gain of the servo circuit fluctuates and the signal level fluctuates with wobble signals, which makes stable recording operation impossible. Therefore, when recording data on an optical disk, a sample-and-hold circuit that samples and holds the light-receiving element output of the laser beam is used.
- FIG. 6 shows a wobble signal generation circuit using such a conventional sample and hold circuit
- FIG. 7 shows a servo signal generation circuit
- Fig. 5 shows a block diagram for explaining the configuration of the light receiving element portion of the optical pickup. As shown in FIG. 5, the optical pickup light receiving element 1 is divided into four divided light receiving elements A, B, C, D located in a group where optical disk pits are formed, and both sides of the optical disk radial direction of this group.
- Two quadrant light receiving elements (El, E2, E3, E 4), (Fl, F2, F3, F4) forces are formed, and the output currents of the optical pickup light receiving elements A, B, C, D are respectively It is converted to voltage output signals MA, MB, MC, MD by IV converter 2, and the output current at the same position of optical pickup light receiving element (El, E2, E3, E4) (Fl, F2, F3, F4) ( ElorFl), (E2orF2), (E3orF3), and (E4orF4) are converted into voltage output signals SE, SF, SG, and SH by IV converter 2, respectively, and the wobble signal generation circuit of FIG. 6 and the servo signal of FIG. Output to the generation circuit.
- the sample hold circuit 6 outputs the input voltage to the output terminal through the input terminal and stores the input voltage in the capacitor while the sample pulse signal 5 is H (high), and the sample pulse signal 5 is L (low). During this period, the input and output terminals are cut off and the capacitor voltage is output during that period.
- the output signals MA, MB, MC, and MD of the IV converter 2 are added to the output signals MA and MD, and the output signals MB and MC are added and input to the VGA circuit 7, respectively.
- the gain is increased or decreased by a certain amount, and then input to sample hold circuit 6 respectively.
- the output voltage of each sample-and-hold circuit 6 described above is converted into a constant voltage by the VGA circuit 8, and the output voltage of these VGA circuits 8 increases the error.
- the width device 9 and amplitude adjustment by the VGA circuit 10 only the signal in the wobble frequency band is extracted by the BPF 11, and the wobble signal 4 is generated. If you replace it with a formula,
- a method for extracting only the signal in the wobble frequency band by the BPF 11 from the signal obtained by subtraction by the error amplifier 9 is disclosed in, for example, Japanese Patent Application Laid-Open No. 2002-100041.
- the output signals (MA, MB, MC, MD) and (SE, SF, SG, SH) of the IV change ⁇ 2 are increased by a certain amount or gained by the VGA circuit 13, respectively. After being down, it is input to the sample hold circuit 6.
- the output voltages (SMA, SMB, SMC, SMD) and (SSE, SSF, SSG, SSH) of each sample-and-hold circuit 6 described above are respectively input to the error signal generation circuit 14 and applied to the following arithmetic expression.
- Servo control signal is output.
- Equation (2) is the tracking control signal arithmetic equation
- Equation (3) is the focus control signal arithmetic equation.
- Fig. 8 (a) shows the output signal of the I-V converter 2
- Fig. 8 (b) shows the sample pulse signal 5
- Fig. 8 (c) shows the output signal of the sample hold circuit 6
- Fig. 9 (e ) Is an enlarged view of the output signal of I-V converter 2 in Fig. 8 (a)
- Fig. 9 (f) is an enlarged view of sample pulse signal 5 shown in Fig. 8 (b)
- Fig. 9 (g) is a diagram. 8 shows an enlarged view of the output signal of the sample hold circuit 6 shown in FIG.
- ringing h occurs after the rise and fall of the IV converter 2. Therefore, after the sample hold circuit of the conventional sample hold circuit 6 described above, Since the signal including the ringing h is output, the noise signal i is included in the wobble signal 4 and each control signal. In addition, if sampling is performed without including the ringing h portion, the section j area that can be sampled becomes narrow, and the difference from the actual signal becomes large, increasing the risk of malfunction.
- an object of the present invention is to provide a signal generation circuit of an optical disc recording / reproducing apparatus that can perform stable address information reading and actuator control such as tracking and focusing.
- the present invention provides an optical pickup that receives reflected light of the recording surface force of spot light irradiated on an optical disk having a recording area formed on a recording surface in a spiral shape or a concentric shape.
- a signal generation circuit of an optical disc recording / reproducing apparatus for detecting a wobble signal based on meandering of the recording area based on a signal from a light receiving element in the signal region, wherein the signal power of the light receiving element is a low frequency band close to a wobble signal band
- the present invention provides a sample hold circuit for sampling the signal of the light receiving element force, and inputs an output signal of the sample hold circuit to the low pass filter or band filter, and records it from the signal of the light receiving element.
- the fluctuation region due to power is removed by a sample hold circuit, and the ringing frequency at the fall and rise due to the signal power level fluctuation of the sample hold circuit is removed by the low pass filter or the band filter.
- the present invention also provides information on the optical disc based on a signal of a light receiving element in an optical pickup that irradiates an information recording surface of a recordable optical disc with spot light and detects reflected light from the information recording surface.
- a signal generation circuit of an optical disc recording / reproducing apparatus that generates and outputs an error signal indicating a relative error in controlling the light beam with respect to the surface, and passes only a low frequency that can control the signal force actuator of the light receiving element.
- Low-pass filter to be provided A band-pass filter that allows passage of only one frequency band that can control the signal power actuator of the light-receiving element is superimposed on the signal from the light-receiving element! / Effect of recording pulse to be removed is removed by the low-pass filter or band-pass filter.
- the present invention provides a sample hold circuit that performs sampling of signal strength of the light receiving element, and inputs an output signal of the sample hold circuit to the low-pass filter or band filter, and records the signal from the signal of the light receiving element. Fluctuation due to power is removed by a sample hold circuit, and the signal power of the sample hold circuit is also removed by the low-pass filter or the band filter at the time of falling and rising due to level fluctuation. .
- the present invention has the advantage that a stable recording operation can be obtained because the configuration information described above can reduce address information acquisition errors and generate a noise-free servo signal.
- FIG. 1 is a block diagram showing a wobble signal generation circuit in a signal generation circuit of an optical disc recording / reproducing apparatus in Embodiment 1 of the present invention.
- FIG. 2 is a block diagram showing a servo signal generation circuit in the signal generation circuit of the optical disc recording / reproducing apparatus in Embodiment 2 of the present invention.
- FIG. 3 is a block diagram showing a wobble signal generation circuit in the signal generation circuit of the optical disc recording / reproducing apparatus in Embodiment 3 of the present invention.
- FIG. 4 is a block diagram showing a servo signal generation circuit in the signal generation circuit of the optical disc recording / reproducing apparatus in Embodiment 4 of the present invention.
- FIG. 5 is a block diagram for explaining a configuration of an optical pickup light receiving element portion.
- FIG. 6 is a block diagram for explaining a problem related to a wobble signal generation circuit.
- FIG. 7 is a block diagram for explaining a problem related to a servo signal generation circuit.
- FIG. 8 is a signal waveform diagram showing signals of a wobble generation circuit and a servo signal generation circuit.
- FIG. 9 is a signal waveform diagram for explaining problems with the wobble signal generation circuit and the servo signal generation circuit.
- a recording area is formed in a spiral shape or concentric shape on the recording surface, and the recording area is meandering.
- FIG. 1 is a block diagram of a wobble signal generation circuit (an example of a signal generation circuit) of an optical disk recording / reproducing apparatus according to Embodiment 1 of the present invention.
- a low-pass filter (when applied to optical disk recording using an organic dye) This shows the configuration of the wobble signal generation circuit in the low pass filter (hereinafter referred to as LPF).
- LPF low pass filter
- the output signals MA, MB, MC, MD of I-V variation ⁇ 2 in Fig. 5 are added to output signals MA and MD, and output signals MB and MC are added.
- Each is input to the VGA circuit 7, and after adjusting the amplitude in each VGA circuit 7 (after increasing or decreasing the gain by a certain amount), only the low frequency part close to the band of the wobble signal is passed.
- Input to LPF15 Signals that have passed through only the low frequency part close to the band of the wobble signal by the LPF 15 are adjusted to a constant amplitude by the VGA circuit 8, respectively.
- the frequency band of the EFM signal to be recorded is between 3T: approx. 1.44MHz at 1x speed: LIT: approx. 393KHz (clock pulse period), and even at the slowest frequency, approx. 393 KHz at 11T recording It becomes.
- the frequency band of the wobble signal is between 1T: approx. 21.05KHz and 3T: approx. 23.05KHz at 1x speed, and approximately 21.05KHz during 1T playback even at the earliest frequency. It can be seen that there is a difference between the EFM signal frequency recorded in this way and the wobble signal frequency reproduced.
- LPF15 that includes only the frequency band of the EFM signal including the frequency band of the wobble signal and passes only the frequency that is less than the slowest frequency (393KHz), for example, LPF15 that passes only the frequency of 200KHz or less is recorded.
- a signal that is cut with respect to the ringing frequency can also be output, and when it is input to the VGA circuit 8, a noise-free signal that is not affected by the recording pulse is input, so address information acquisition errors can be reduced. Therefore, stable recording operation can be provided.
- a band filter (band pass filter: hereinafter referred to as BPF) 16 that passes only a certain range of frequencies of the wobble signal frequency band is used.
- BPF16 that passes the frequency band of the wobble signal with less than the slowest frequency (393KHz) in the frequency band of the EFM signal, for example, BPF16 that passes only the frequency band of 30KHz to 10KHz, it occurs because of recording.
- the ringing frequency at the time of falling and at the time of rising due to the level fluctuation of the output signal of the IV converter 2 whose frequency is higher than the fluctuation due to the recording power as well as the fluctuation due to the recording power of the light receiving element synchronized with the EFM signal Can also output a cut signal, and when it is input to the VGA circuit 8, it is affected by the recording pulse.
- a signal is input without noise, errors in obtaining address information can be reduced, and a stable recording operation can be provided.
- FIG. 2 is a block diagram of a servo signal generation circuit (an example of a signal generation circuit) of the optical disc recording / reproducing apparatus in Embodiment 2 of the present invention, and shows a case where recording is performed on a recordable optical disc.
- LPF18 output signals (SMA, SMB, SMC, SMD) and (SSE, SSF, SSG, SSH) are error signals that indicate relative errors in the control of the light beam with respect to the information surface of the optical disc.
- a servo control signal (tracking error signal, focus error signal, etc.) represented by the above formulas (2), (3), etc. is formed by being input to the generation circuit 14.
- the frequency band of the EFM signal to be recorded is between 3T: about 1.44MHz at 1x speed: LIT: about 393KHz (clock pulse period), and about 393KHz at 11T recording even at the slowest frequency It becomes.
- the frequency band in which the actuator can be controlled with a standard optical disk drive is about ⁇ . In other words, if the frequency of the actuator control signal itself is normally output up to about ⁇ , there is no problem in controlling the actuator.
- LPF18 that includes the frequency band in which the actuator can be controlled and passes only the low frequency below the frequency (393KHz) of the EFM signal frequency band, for example, only the low frequency below 200KHz.
- the LPF 18 If the LPF 18 is passed through, not only will the light receiving element output be synchronized with the EFM signal generated due to the recording, but also the fluctuation due to the recording power, as well as the I-V variation due to the fluctuation in the level of the output signal with a frequency higher than the fluctuation due to the recording power. It is possible to output a stressed signal regarding the ringing frequency at the falling and rising edges of the Serial when the No. is input to the generating circuit 14 Since noise-free signals are input without being affected by recording pulses, servo signals without noise superimposed on servo control signals (actuator control signals) can be generated, so stable recording operations can be performed. Can be provided.
- a BPF 17 that allows only the frequency band in which the actuator can be controlled to pass can be used. Because it is recorded as BPF17 which passes the frequency band which is the slowest in the frequency band of the EFM signal and less than the frequency (393KHz) and can control the actuator, for example, only the frequency band of 10KHz to 120Hz is passed.
- the ringing frequency at the falling and rising edges due to the fluctuation in the level of the output signal of the IV converter 2 whose frequency is higher than the output fluctuation of the light receiving element force can also output a cut signal, and when it is input to the error signal generation circuit 14, the signal is input without being affected by the recording pulse, so that a servo signal without noise can be generated and stable recording can be performed. Action can be provided.
- Embodiment 3 of the present invention will be described below with reference to FIG.
- the sample hold circuit 6 shown in FIG. 6 is inserted between the VGA 7 and the LPF 15 in the first embodiment.
- the fluctuation region due to the recording power of the light receiving element output synchronized with the EFM signal generated due to recording is removed by the sample hold circuit 6, and the level of the output signal of the IV converter 2 is reduced.
- the LPF15 also removes the signal strength of the sample-and-hold circuit 6 with respect to the falling and rising ringing frequencies due to fluctuations. In other words, when input to the VGA circuit 8, it is not affected by the recording pulse! Since a noiseless input signal is input, it is possible to reduce address information acquisition errors and provide a stable recording operation. it can.
- BPF 16 may be used instead of LPF 15 used in the third embodiment. According to this configuration, similarly, the fluctuation due to the recording power of the light receiving element output synchronized with the EFM signal generated due to the recording is removed by the sample hold circuit 6, and the level fluctuation of the output signal of the IV converter 2 is removed. And falling and rising phosphorus Ging frequency is removed by BPF16. In other words, since the signal is input without being affected by the recording pulse when it is input to the VGA circuit 8, the address information acquisition error can be reduced, and a stable recording operation can be provided.
- Embodiment 4 of the present invention will be described below with reference to FIG.
- the sample hold circuit 6 shown in FIG. 7 is inserted between the VGA 13 and the LPF 18 in the second embodiment.
- the fluctuation region due to the recording power of the light receiving element output synchronized with the EFM signal being recorded is removed by the sample and hold circuit 6, and at the time of falling due to the level fluctuation of the output signal of the IV converter 2
- the signal power of the sample hold circuit 6 is also removed by the LPF18, so when it is input to the error signal generation circuit 14 it is not affected by the recording pulse! Therefore, it is possible to generate a servo signal without noise that is superimposed on the servo signal, and to provide a stable recording operation.
- BPF17 may be used in place of LPF18 used in the fourth embodiment. According to this configuration, similarly, the fluctuation due to the recording power of the light receiving element output synchronized with the EFM signal being recorded is removed by the sample-and-hold circuit 6, and when the output signal falls due to the fluctuation in the level of the output signal of the IV converter 2.
- the ringing frequency at the rise is removed by the BPF 17, that is, when it is input to the error signal generation circuit 14, it is not affected by the recording pulse, and the signal is input without noise. It is possible to generate a servo signal without noise that noise is not superimposed on, and to provide a stable recording operation.
- the recording area is formed in a spiral shape or concentric shape on the recording surface, and the force is applied to an optical disk in which this recording area is meandering.
- this embodiment 2 and this embodiment 4 It is not limited to optical discs with such wobbles, but optical discs that can record data.
- the signal generation circuit of the optical disc recording / reproducing apparatus acquires address information. Since it can reduce errors and generate servo signals without noise, it can be used as a technical field for recording data and addresses on DVDs and CDs. It is.
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Abstract
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Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US11/631,848 US20070195681A1 (en) | 2004-07-30 | 2005-07-14 | Signal generating circuit of optical disc recording/reproducing apparatus |
Applications Claiming Priority (2)
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JP2004-222663 | 2004-07-30 | ||
JP2004222663A JP2006040489A (ja) | 2004-07-30 | 2004-07-30 | 光ディスク記録再生装置の信号生成回路 |
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WO2006011375A1 true WO2006011375A1 (ja) | 2006-02-02 |
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PCT/JP2005/013071 WO2006011375A1 (ja) | 2004-07-30 | 2005-07-14 | 光ディスク記録再生装置の信号生成回路 |
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US (1) | US20070195681A1 (ja) |
JP (1) | JP2006040489A (ja) |
CN (1) | CN1969325A (ja) |
TW (1) | TW200614201A (ja) |
WO (1) | WO2006011375A1 (ja) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002216363A (ja) * | 2000-11-15 | 2002-08-02 | Matsushita Electric Ind Co Ltd | 光ディスク装置および情報読み出し方法 |
JP2002288855A (ja) * | 2001-03-26 | 2002-10-04 | Matsushita Electric Ind Co Ltd | 光ディスク装置 |
JP2004071142A (ja) * | 2002-07-24 | 2004-03-04 | Matsushita Electric Ind Co Ltd | 光ディスク装置および光ディスク装置における記録制御方法 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
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PL193933B1 (pl) * | 1998-08-04 | 2007-04-30 | Koninkl Philips Electronics Nv | Dysk optyczny |
US6912190B2 (en) * | 2000-11-15 | 2005-06-28 | Matsushita Electric Industrial Co., Ltd. | Optical disc apparatus and method for reading information from an optical disk having tracks and spaces between the tracks on which address information is recorded |
JP2002329325A (ja) * | 2001-04-27 | 2002-11-15 | Shinano Kenshi Co Ltd | ウォブル成分抽出方法およびそれを用いたディスクドライブ装置 |
TW200403635A (en) * | 2002-07-24 | 2004-03-01 | Matsushita Electric Ind Co Ltd | Optical disc drive and method of controlling write operation performed by optical disc drive |
-
2004
- 2004-07-30 JP JP2004222663A patent/JP2006040489A/ja active Pending
-
2005
- 2005-07-14 CN CNA2005800197057A patent/CN1969325A/zh active Pending
- 2005-07-14 WO PCT/JP2005/013071 patent/WO2006011375A1/ja active Application Filing
- 2005-07-14 US US11/631,848 patent/US20070195681A1/en not_active Abandoned
- 2005-07-21 TW TW094124630A patent/TW200614201A/zh unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002216363A (ja) * | 2000-11-15 | 2002-08-02 | Matsushita Electric Ind Co Ltd | 光ディスク装置および情報読み出し方法 |
JP2002288855A (ja) * | 2001-03-26 | 2002-10-04 | Matsushita Electric Ind Co Ltd | 光ディスク装置 |
JP2004071142A (ja) * | 2002-07-24 | 2004-03-04 | Matsushita Electric Ind Co Ltd | 光ディスク装置および光ディスク装置における記録制御方法 |
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Publication number | Publication date |
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TW200614201A (en) | 2006-05-01 |
JP2006040489A (ja) | 2006-02-09 |
US20070195681A1 (en) | 2007-08-23 |
CN1969325A (zh) | 2007-05-23 |
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