WO2022080202A1 - 光ディスク装置及び録画再生装置 - Google Patents
光ディスク装置及び録画再生装置 Download PDFInfo
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- WO2022080202A1 WO2022080202A1 PCT/JP2021/036927 JP2021036927W WO2022080202A1 WO 2022080202 A1 WO2022080202 A1 WO 2022080202A1 JP 2021036927 W JP2021036927 W JP 2021036927W WO 2022080202 A1 WO2022080202 A1 WO 2022080202A1
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- signal
- optical disk
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- optical
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- 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
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0945—Methods for initialising servos, start-up sequences
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- 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
- G11B7/00375—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs arrangements for detection of physical defects, e.g. of recording layer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/9506—Optical discs
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- 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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
- G11B7/1263—Power control during transducing, e.g. by monitoring
-
- 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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/127—Lasers; Multiple laser arrays
-
- 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
- G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
- G11B2007/0006—Recording, reproducing or erasing systems characterised by the structure or type of the carrier adapted for scanning different types of carrier, e.g. CD & DVD
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- 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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/127—Lasers; Multiple laser arrays
- G11B7/1275—Two or more lasers having different wavelengths
Definitions
- This disclosure relates to an optical disk device and a recording / playback device.
- An optical disk device that records or reproduces information on an optical disk by irradiating the optical disk with a laser beam is known (see, for example, Patent Documents 1 and 2).
- This type of optical disk device includes an optical pickup and a controller.
- the optical pickup irradiates the optical disc with laser light, receives the reflected light from the optical disc, and outputs a light receiving signal corresponding to the received reflected light.
- the controller generates a focus error signal, a tracking error signal, and the like based on the received signal from the optical pickup.
- the present disclosure provides an optical disk device and a recording / playback device capable of accurately recording or reproducing information on an optical disk even when the optical pickup becomes dirty.
- the optical disk device in the present disclosure is an optical disk device that records or reproduces information on an optical disk by irradiating the optical disk with laser light, and is a laser light source that emits laser light and a laser emitted from the laser light source.
- An optical pickup including an objective lens that converges light on an optical disk, a light receiving element that receives reflected light from the optical disk and outputs a light receiving signal by photoelectrically converting the received reflected light, and light receiving from the light receiving element.
- the optical pickup is contaminated when the light amount signal generation unit that generates a light amount signal indicating the amount of light reflected from the optical disk based on the signal and the peak level of the light amount signal is less than the first threshold value. It is provided with a dirt determination unit that controls the laser light source or the light receiving element so as to increase the peak level of the light receiving signal from the light receiving element.
- optical disc device and the like in the present disclosure, information can be accurately recorded or reproduced on the optical disc even when the optical pickup is contaminated.
- FIG. 1 is a diagram showing a configuration of an optical disk device according to the first embodiment.
- FIG. 2 is a diagram showing a light receiving element of the optical disk device according to the first embodiment.
- FIG. 3 is a flowchart showing the operation flow of the optical disk device according to the first embodiment.
- FIG. 4 is a flowchart specifically showing the process of step S102 of FIG.
- FIG. 5 is a diagram for explaining the operation of the optical disc device according to the first embodiment.
- FIG. 6 is a diagram showing the configuration of the optical disk device according to the second embodiment.
- FIG. 7 is a flowchart showing the operation flow of the optical disk device according to the second embodiment.
- FIG. 1 is a diagram showing a configuration of an optical disk device 2 according to the first embodiment.
- FIG. 2 is a diagram showing a light receiving element 30 of the optical disk device 2 according to the first embodiment.
- the optical disk device 2 includes an optical pickup 4 and a control unit 6.
- the optical disk device 2 is mounted on, for example, a BD (Blu-ray (registered trademark) Disc) recorder (an example of a recording / playback device) capable of recording or reproducing information on an optical disk 8.
- BD Blu-ray (registered trademark) Disc
- the optical disk device 2 is connected to a display such as a liquid crystal television receiver.
- the optical disk 8 includes a BD, a DVD (Digital Versaille Disc), and a CD (Compact Disc).
- BD is an example of a first optical disc
- DVD and CD are examples of a second optical disc.
- the optical pickup 4 is an optical pickup unit (OPU: Optical Pickup Unit) for recording or reproducing information on the optical disk 8.
- the optical pickup 4 includes a first laser light source 10, a second laser light source 12, a first beam splitter 14, a second beam splitter 15, a collimator lens 16, a reflector 18, and a front monitor 20. It has a 1/4 wave plate 22, an objective lens 24, a lens actuator 26, a cylindrical lens 28, and a light receiving element 30.
- the first laser light source 10 is an LD (Laser Diode) that emits a laser beam for BD having a wavelength of 405 nm.
- the laser beam for BD is an example of the first laser beam.
- the second laser light source 12 is a dual wavelength integrated LD capable of emitting a laser beam for a DVD having a wavelength of 650 nm and a laser beam for a CD having a wavelength of 780 nm.
- the laser light for DVD and the laser light for CD are examples of the second laser light.
- the second laser light source 12 is a two-wavelength integrated LD, but the present invention is not limited to this, and a third laser light source (not shown) is separate from the second laser light source 12.
- the second laser light source 12 may be an LD that emits a laser beam for a DVD, and the third laser light source may be an LD that emits a laser beam for a CD.
- the first beam splitter 14 reflects the laser light from the second laser light source 12.
- the laser beam reflected by the first beam splitter 14 is sent to the second beam splitter 15.
- the second beam splitter 15 transmits the laser light from the second laser light source 12 and reflects the laser light from the first laser light source 10.
- the laser beam transmitted or reflected by the second beam splitter 15 is sent to the collimator lens 16.
- the collimator lens 16 converts the laser light sent from the second beam splitter 15 into parallel light.
- the laser beam converted into parallel light by the collimator lens 16 is sent to the reflector 18.
- the reflector 18 reflects the laser beam sent from the collimator lens 16 and guides it to the 1/4 wave plate 22. Further, the reflector 18 transmits a part of the laser beam sent from the collimator lens 16 and guides it to the front monitor 20.
- the front monitor 20 generates an electric signal according to the intensity of the incident laser light, and each emitted from the first laser light source 10 and the second laser light source 12 so that the electric signal is kept constant. Controls the intensity of the laser beam.
- the 1/4 wave plate 22 has a function of converting linearly polarized light into circularly polarized light and converting circularly polarized light into linearly polarized light.
- the 1/4 wave plate 22 is for preventing the laser light reflected by the optical disk 8 from returning to the first laser light source 10 and the second laser light source 12.
- the objective lens 24 converges the laser beam sent from the 1/4 wave plate 22.
- the laser beam focused by the objective lens 24 is reflected by the recording surface 8a of the optical disk 8.
- the lens actuator 26 drives the objective lens 24 in the focus direction, the tracking direction, and the like.
- the lens actuator 26 is controlled by the focus control unit 44 and the tracking control unit 50, which will be described later.
- the laser light (reflected light) reflected by the recording surface 8a of the optical disk 8 includes an objective lens 24, a 1/4 wavelength plate 22, a reflecting plate 18, a collimator lens 16, a second beam splitter 15, and a first beam splitter 14.
- the light is incident on the light receiving element 30 via the cylindrical lens 28.
- the cylindrical lens 28 causes astigmatism in the laser light sent from the first beam splitter 14.
- the laser beam transmitted through the cylindrical lens 28 is sent to the light receiving element 30.
- the light receiving element 30 is a photoelectric conversion element (OEIC: OptitoElectronic Integrated Circuit).
- OEIC OptitoElectronic Integrated Circuit
- the light receiving element 30 has a light receiving signal generation unit 32 and a light receiving signal gain adjusting unit 34.
- the light receiving signal generation unit 32 receives the reflected light from the optical disk 8 and generates a light receiving signal by photoelectrically converting the received reflected light.
- the light receiving signal generation unit 32 has, for example, photodiodes 36a, 36b, 36c, 36d (36a to 36d) arranged in 2 rows and 2 columns.
- the light receiving signal generation unit 32 generates a light receiving signal by individually photoelectrically converting the reflected light received by each of the photodiodes 36a to 36d.
- the light receiving signal gain adjusting unit 34 amplifies the light receiving signal generated by the light receiving signal generation unit 32 at a predetermined amplification factor.
- the light receiving signal gain adjusting unit 34 can switch a predetermined amplification factor into, for example, three stages (high level, middle level, and low level).
- the light-receiving signal gain adjusting unit 34 outputs the light-receiving signal amplified at a predetermined amplification factor to the control unit 6.
- the control unit 6 includes an A / D conversion unit 38, an FE signal generation unit 40, an AGC (Automatic Gain Control) circuit 42, a focus control unit 44, a TE signal generation unit 46, an AGC circuit 48, and tracking control. It has a unit 50, an RF signal generation unit 52, an FS signal generation unit 54, a disk determination unit 55, a stain determination unit 56, and an LD type unit 57.
- the control unit 6 is composed of, for example, a DSP (Digital Signal Processor).
- the A / D conversion unit 38 converts the light receiving signal from the light receiving element 30 from an analog signal to a digital signal.
- the A / D conversion unit 38 outputs the received light signal converted into a digital signal to the FE signal generation unit 40, the TE signal generation unit 46, the RF signal generation unit 52, and the FS signal generation unit 54.
- the FE signal generation unit 40 outputs the generated FE signal to the AGC circuit 42.
- the AGC circuit 42 is a normalized focus error signal (hereinafter, “normalized FE signal”) which is a ratio (FE signal / FS signal) of the FE signal from the FE signal generation unit 40 and the FS signal from the FS signal generation unit 54. ”) Is generated.
- the AGC circuit 42 performs a process (automatic gain control: AGC) of normalizing the amplitude of the FE signal to a constant value regardless of the amount of reflected light.
- the AGC circuit 42 outputs the normalized FE signal to the focus control unit 44 and the disc determination unit 55.
- the AGC circuit 42 is an example of the first automatic gain controller.
- the focus control unit 44 generates a focus control signal for controlling the drive of the lens actuator 26 based on the normalized FE signal from the AGC circuit 42, and outputs the generated focus control signal to the lens actuator 26.
- the lens actuator 26 moves the objective lens 24 in the focus direction (directions closer to and away from the recording surface 8a of the optical disk 8) based on the focus control signal from the focus control unit 44.
- focus control is performed to adjust the position of the objective lens 24 in the focus direction so that the laser beam emitted from the objective lens 24 is converged on the recording surface 8a of the optical disk 8.
- the TE signal generation unit 46 outputs the generated TE signal to the AGC circuit 48.
- the AGC circuit 48 is a normalized tracking error signal (hereinafter, “normalized TE signal”) which is a ratio (TE signal / FS signal) of the TE signal from the TE signal generation unit 46 and the FS signal from the FS signal generation unit 54. ”) Is generated. As a result, the AGC circuit 48 performs a process of normalizing the amplitude of the TE signal to a constant value. The AGC circuit 48 outputs the normalized TE signal to the tracking control unit 50.
- the AGC circuit 48 is an example of the second automatic gain controller.
- the tracking control unit 50 generates a tracking control signal for controlling the drive of the lens actuator 26 based on the normalized TE signal from the AGC circuit 48, and outputs the generated tracking control signal to the lens actuator 26.
- the lens actuator 26 moves the objective lens 24 in the tracking direction (radial direction of the optical disk 8) based on the tracking control signal from the tracking control unit 50. As a result, tracking control is performed to adjust the position of the objective lens 24 in the tracking direction so that the laser beam from the objective lens 24 follows the track of the recording surface 8a of the optical disk 8.
- the RF signal generation unit 52 generates an RF (Radio Frequency) signal for reproducing the information recorded on the optical disk 8 based on the received light signal from the A / D conversion unit 38.
- the RF signal is a reproduction signal including a video signal and an audio signal.
- the RF signal generation unit 52 outputs the generated RF signal to the display via a demodulation signal processing circuit (not shown) and a video decoding circuit (not shown).
- the FS signal generation unit 54 generates a focus sum signal (hereinafter referred to as “FS signal”) indicating the amount of reflected light from the optical disk 8 based on the light receiving signal from the A / D conversion unit 38. Specifically, as shown in FIG. 2, the FS signal generation unit 54 receives a light-receiving signal A received by the photodiode 36a of the light-receiving element 30, a light-receiving signal B received by the photodiode 36b, and a light-receiving signal by the photodiode 36c.
- the FS signal A + B + C + D is generated by adding the received light receiving signal C and the light receiving signal D received by the photodiode 36d.
- the FS signal generation unit 54 outputs the generated FS signal to the AGC circuit 42, the AGC circuit 48, and the dirt determination unit 56.
- the FS signal is an example of a light quantity signal
- the FS signal generation unit 54 is an example of a light quantity signal generation unit.
- the disk determination unit 55 has both amplitudes (PP) of the normalized FE signal from the AGC circuit 42 based on the information from the LD type unit 57 indicating, for example, that “the laser light for BD is currently being irradiated”.
- the type of the optical disk 8 is determined based on the comparison between the amplitude) and the BD determination threshold (an example of the second threshold). Both amplitudes mean the fluctuation width of the peak on the time axis (peak-to-peak).
- the dirt determination unit 56 receives the determination result of the disk determination unit 55, for example, the result that "the current optical disk is BD and is constant to the type of laser light", and the peak level of the FS signal is the LD type unit 57.
- the dirt determination threshold value an example of the first threshold value
- the light receiving signal gain adjusting unit 34 of the light receiving element 30 is controlled so as to increase the amount.
- the dirt determination threshold value is a different value for each type of the optical disc 8 (BD, DVD, and CD), and is switched by the LD type unit 57.
- the LD type unit 57 determines that the type of laser light is the laser light for BD
- the LD type unit 57 switches to the threshold value for determining stains for BD.
- the stain determination unit 56 operates only when the determination result by the LD type unit 57 is the laser beam for BD and the determination result of the disc determination unit 55 is BD.
- the LD type unit 57 determines the type of laser light emitted from the first laser light source 10 or the second laser light source 12 (laser light for BD, laser light for DVD, laser light for CD). ..
- the LD type unit 57 outputs information indicating the type of the determined laser light (for example, information indicating that “the laser light for BD is currently being irradiated”) to the disc determination unit 55 and the stain determination unit 56.
- FIG. 3 is a flowchart showing the operation flow of the optical disk device 2 according to the first embodiment.
- FIG. 4 is a flowchart specifically showing the process of step S102 of FIG.
- FIG. 5 is a diagram for explaining the operation of the optical disc device 2 according to the first embodiment.
- the user places the optical disk 8 on the tray (not shown) of the optical disk device 2, and inserts the optical disk 8 mounted on the tray into the inside of the optical disk device 2 (S101). ..
- step S102 of FIG. 3 the process of determining the type of the optical disk 8 placed on the tray is determined.
- the first case is a case where the optical disk 8 is a BD and the optical pickup 4 is free of cigarette stains.
- the second case is a case where the optical disk 8 is a BD and the optical pickup 4 has tobacco stains.
- the third case is a case where the optical disk 8 is other than the BD (including the case where the optical disk 8 is not inserted inside the optical disk device 2).
- the cigarette stain means the stain inside the optical pickup 4 generated by the cigarette smoke entering the inside of the optical pickup 4.
- the laser beam for BD from the first laser light source 10 is applied to the optical disk 8 (S1021).
- the lens actuator 26 moves the objective lens 24 in a direction close to the recording surface 8a of the optical disk 8.
- the AGC circuit 42 has a ratio (FE signal / FS signal) of the FE signal from the FE signal generation unit 40 ((b) in FIG. 5) and the FS signal from the FS signal generation unit 54 ((c) in FIG. 5). ) Is calculated to generate a normalized FE signal ((d) in FIG. 5).
- both amplitudes PL1 of the normalized FE signal generated by the AGC circuit 42 are BD based on the information from the LD type unit 57 indicating that “the laser light for BD is currently being irradiated”. It is determined whether or not the determination threshold value is TH1 or higher (S1022).
- the disc determination unit. 55 determines that the type of the optical disk 8 is BD (S1023).
- both amplitudes of the FE signal and the peak level of the FS signal in the second case are both amplitudes of the FE signal and the peak level of the FS signal in the first case, respectively. Will be lower than. This is because, in the second case, cigarette stains are generated inside the optical pickup 4. However, since the rate of decrease of the FE signal and the FS signal in the second case with respect to the FE signal and the FS signal in the first case is almost the same, the FE signal and the FE signal are used in the first case and the second case. The ratio to the FS signal (FE signal / FS signal) is almost constant. Therefore, as shown in the first case and the second case in FIG. 5D, when the optical disk 8 is a BD, the normalized FE signal is displayed regardless of the presence or absence of tobacco stains in the optical pickup 4. Both amplitudes PL1 are equal to or higher than the BD determination threshold value TH1.
- the disc determination unit. 55 determines that the type of the optical disk 8 is other than BD (S1024).
- the light emission of the first laser light source 10 is stopped, and the lens actuator 26 moves the objective lens 24 that has moved in the direction close to the recording surface 8a of the optical disc 8 in the direction away from the recording surface 8a of the optical disc 8.
- the laser beam for DVD from the second laser light source 12 is applied to the optical disk 8 (S1025).
- the lens actuator 26 moves the objective lens 24 in a direction close to the recording surface 8a of the optical disk 8.
- the disk determination unit 55 determines the normalized FE signal generated by the AGC circuit 42 based on the information from the LD type unit 57 indicating that “the laser beam for DVD is currently being irradiated”. It is determined whether or not both amplitudes are equal to or greater than the DVD determination threshold value (S1026).
- the disc determination unit 55 determines that the type of the optical disk 8 is DVD (S1027).
- the disk determination unit 55 determines that the type of the optical disk 8 is other than DVD (S1028). In this case, the laser beam for the CD from the second laser light source 12 is applied to the optical disk 8 (S1029). At this time, the lens actuator 26 moves the objective lens 24 in a direction away from the recording surface 8a of the optical disc 8 and then moves in a direction close to the recording surface 8a of the optical disc 8 in the same manner as described above.
- the disk determination unit 55 determines the normalized FE signal generated by the AGC circuit 42 based on the information from the LD type unit 57 indicating that “the laser beam for the CD is currently being irradiated”. It is determined whether or not both amplitudes are equal to or greater than the CD determination threshold value (S1030).
- the disk determination unit 55 determines that the type of the optical disk 8 is CD (S1031).
- the disk determination unit 55 has no optical disk 8, that is, the optical disk 8 is inserted inside the optical disk device 2. It is determined that this is not the case (S1032). As described above, the determination process of the type of the optical disk 8 is completed.
- step S102 the disk determination unit 55 determines the number of layers of the optical disk 8 (for example, one layer, two layers, or three layers) based on the number of S-shaped curves included in the normalized FE signal. Judgment (S103).
- the dirt determination unit 56 tentatively determines a predetermined amplification factor in the light receiving signal gain adjusting unit 34 of the light receiving element 30 to, for example, a middle level, based on the determination results in steps S102 and S103 (S104).
- the dirt determination unit 56 determines whether or not the peak level of the FS signal from the FS signal generation unit 54 is equal to or higher than the dirt determination threshold TH2 (S105).
- the dirt determination unit 56 is the optical pickup 4. It is determined that no tobacco stain is generated inside (S106). In this case, the dirt determination unit 56 maintains a predetermined amplification factor in the light receiving signal gain adjusting unit 34 of the light receiving element 30 at, for example, a middle level (S107).
- the disk determination unit 55 sets the optical disk 8 in the ROM system and the optical disk 8 based on the comparison between the PP signal (signal generated by the push-pull method) and the DPD signal (signal generated by the phase difference method) of the TE signal. , R / RW system (S108).
- the dirt determination unit 56 finally determines a predetermined amplification factor in the light receiving signal gain adjusting unit 34 of the light receiving element 30 in consideration of the determination result in step S108 (S109), and ends the process.
- step S105 when the peak level PL4 of the FS signal is less than the dirt determination threshold TH2 (NO in S105), the dirt determination unit 56 , It is determined that cigarette stains are generated inside the optical pickup 4 (S110). This is because the optical system of the optical pickup 4 (objective lens 24, cylindrical lens 28, light receiving element 30, etc.) is contaminated with cigarettes, so that the amount of reflected light received by the light receiving element 30 decreases, and the light receiving element 30 This is because the peak level of the received light signal output from is lowered. In this case, the dirt determination unit 56 increases the predetermined amplification factor in the light receiving signal gain adjusting unit 34 of the light receiving element 30 from, for example, a middle level to a high level (S111).
- the peak level of the light receiving signal output from the light receiving element 30 can be brought close to the peak level of the light receiving signal when no tobacco stain is generated inside the optical pickup 4.
- the FE signal generated by the FE signal generation unit 40, the TE signal generated by the TE signal generation unit 46, the RF signal generated by the RF signal generation unit 52, and the FS signal generation unit 54 generate the FE signal.
- Each peak level of the FS signal can be increased.
- step S102 the case where the type of the optical disc 8 is determined to be BD has been described in step S102, but the case where the type of the optical disc 8 is determined to be DVD or CD in step S102 has been described. Is the same as described above. That is, when the dirt determination unit 56 determines that the type of the optical disk 8 is DVD (or CD) by the disk determination unit 55, and the peak level of the FS signal is less than the dirt determination threshold value. It may be determined that the optical pickup 4 is contaminated, and the light receiving signal gain adjusting unit 34 may be controlled so as to increase a predetermined amplification factor.
- the optical disk device 2 is an optical disk device that records or reproduces information on the optical disk 8 by irradiating the optical disk 8 with a laser beam.
- the optical disk device 2 emits laser light from the first laser light source 10 and the second laser light source 12 (laser light source), the first laser light source 10 and the second laser light source 12, and the optical disk 8 emits the laser light.
- An optical pickup 4 including an objective lens 24 that converges upward, a light receiving element 30 that receives light reflected from the optical disk 8 and outputs a light receiving signal by photoelectrically converting the received reflected light, and a light receiving element 30.
- the FS signal generation unit 54 (light amount signal generation unit) that generates an FS signal (light amount signal) indicating the amount of light reflected from the optical disk 8 based on the received light signal, and the peak level of the FS signal are the dirt determination thresholds (third). If it is less than the threshold value of 1), it is determined that the optical pickup 4 is contaminated, and the contamination determination unit 56 that controls the light receiving element 30 so as to increase the peak level of the light receiving signal from the light receiving element 30. And prepare.
- the dirt determination unit 56 controls the light receiving element 30 so as to increase the peak level of the light receiving signal from the light receiving element 30 when it is determined that the optical pickup 4 is dirty.
- the peak level of the light receiving signal from the light receiving element 30 can be brought close to the peak level of the light receiving signal when no tobacco stain is generated inside the optical pickup 4.
- the FE signal generated by the FE signal generation unit 40, the TE signal generated by the TE signal generation unit 46, the RF signal generated by the RF signal generation unit 52, and the FS signal generation unit 54 generate the signal.
- Each peak level of the FS signal to be generated can be increased, and information can be recorded or reproduced with high accuracy on the optical disk 8.
- the optical disk device 2 further normalizes the ratio of the FE signal and the FS signal to the FE signal generation unit 40 that generates the FE signal based on the light receiving signal from the light receiving element 30. It includes an AGC circuit 42 (first automatic gain controller) that generates an FE signal.
- AGC circuit 42 first automatic gain controller
- the normalized FE signal is supplementarily amplified. Can be done. As a result, information can be recorded or reproduced on the optical disc 8 with higher accuracy.
- the optical disc 8 includes different types of BD (first optical disc) and DVD (second optical disc).
- the laser light sources are a first laser light source 10 that emits a BD laser beam (first laser beam) for irradiating the BD, and a DVD laser beam (second laser beam) for irradiating the DVD. ) Is emitted with a second laser light source 12.
- the optical disk device 2 further determines based on the comparison between both amplitudes of the normalized FE signal and the BD determination threshold value (second threshold value) when the first laser light source 10 emits the laser light for BD.
- a disc determination unit 55 for determining whether or not the type of the optical disk 8 is BD is provided.
- the stain determination unit 56 sets the peak level of the FS signal. If it is less than the dirt determination threshold value, it is determined that the optical pickup 4 is dirty.
- the light receiving element 30 receives the reflected light from the optical disk 8 and photoelectrically converts the received reflected light to generate a light receiving signal, and the generated light receiving signal is generated. It has a light receiving signal gain adjusting unit 34 that amplifies the signal at a predetermined amplification factor.
- the stain determination unit 56 sets the peak level of the FS signal.
- it is less than the dirt determination threshold value it is determined that the optical pickup 4 is dirty, and the light receiving signal gain adjusting unit 34 is controlled so as to increase a predetermined amplification factor.
- the peak level of the light receiving signal from the light receiving element 30 can be easily increased.
- the stain determination unit 56 is, for example, a case where the disc determination unit 55 determines that the type of the optical disk 8 is BD, and the peak level of the FS signal is less than the stain determination threshold value.
- the light receiving signal gain adjusting unit 34 may be configured as follows.
- the optical disk device 2 further has a TE signal generation unit 46 that generates an TE signal based on the light receiving signal from the light receiving element 30, and a normalized TE that is a ratio between the TE signal and the FS signal. It includes an AGC circuit 48 (second automatic gain controller) that generates a signal.
- a TE signal generation unit 46 that generates an TE signal based on the light receiving signal from the light receiving element 30, and a normalized TE that is a ratio between the TE signal and the FS signal.
- It includes an AGC circuit 48 (second automatic gain controller) that generates a signal.
- the normalized TE signal is supplementarily amplified. Can be done. As a result, information can be recorded or reproduced on the optical disc 8 with higher accuracy.
- FIG. 6 is a diagram showing the configuration of the optical disk device 2A according to the second embodiment.
- the same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.
- the processing by the stain determination unit 56A of the control unit 6A is different from the first embodiment.
- the stain determination unit 56A when the type of the optical disk 8 is determined by the disk determination unit 55 and the peak level of the FS signal is less than the stain determination threshold, the optical pickup 4 is contaminated.
- the first laser light source 10 and the second laser light source 12 are controlled so as to increase the intensity of the laser light emitted from the first laser light source 10 and the second laser light source 12.
- FIG. 7 is a flowchart showing an operation flow of the optical disc device 2A according to the second embodiment.
- the same step numbers are assigned to the same processes as those of the flowchart of FIG. 3 described above, and the description thereof will be omitted.
- the dirt determination unit 56A when steps S101 to S105 are executed and the peak level of the FS signal is equal to or higher than the dirt determination threshold value (YES in S105), the dirt determination unit 56A is inside the optical pickup 4. It is determined that no tobacco stains have occurred (S106). In this case, the dirt determination unit 56A uses the first laser light source 10 and the second laser light source 12 so as to maintain the intensity of the laser light emitted from the first laser light source 10 and the second laser light source 12. Control (S201). Then, the process proceeds to step S108 described above.
- step S105 when the peak level of the FS signal is less than the dirt determination threshold value (NO in S105), the dirt determination unit 56A determines that cigarette dirt has occurred inside the optical pickup 4 (NO). S110). In this case, the dirt determination unit 56A uses the first laser light source 10 and the second laser light source 12 so as to increase the intensity of the laser light emitted from the first laser light source 10 and the second laser light source 12. Control (S202).
- the peak level of the light receiving signal output from the light receiving element 30 can be brought closer to the peak level of the light receiving signal when no tobacco stain is generated inside the optical pickup 4. can.
- the FE signal generated by the FE signal generation unit 40, the TE signal generated by the TE signal generation unit 46, the RF signal generated by the RF signal generation unit 52, and the FS signal generation unit 54 generate the FE signal.
- Each peak level of the FS signal can be increased.
- the stain determination unit 56A is a case where the disc determination unit 55 determines that the type of the optical disk 8 is BD, and the peak level of the FS signal is less than the stain determination threshold.
- the first laser light source 10 and the first laser light source 10 and the first so as to increase the intensity of the laser light emitted from the first laser light source 10 and the second laser light source 12 by determining that the light pickup 4 is contaminated.
- the laser light source 12 of 2 is controlled.
- the dirt determination unit 56A determines that the light pickup 4 is dirty
- the first laser light source 10 and the first laser light source 10 and the light receiving element 30 so as to increase the peak level of the light receiving signal from the light receiving element 30.
- the second laser light source 12 is controlled.
- the peak level of the light receiving signal from the light receiving element 30 can be brought close to the peak level of the light receiving signal when no tobacco stain is generated inside the optical pickup 4.
- the FE signal generated by the FE signal generation unit 40, the TE signal generated by the TE signal generation unit 46, the RF signal generated by the RF signal generation unit 52, and the FS signal generation unit 54 generate the signal.
- Each peak level of the FS signal to be generated can be increased, and information can be recorded or reproduced with high accuracy on the optical disk 8.
- tobacco stains have been described as an example of stains on the optical pickup 4, but the present invention is not limited to this, and for example, dust stains or moisture stains from a humidifier may be used.
- each component may be configured by dedicated hardware or may be realized by executing a software program suitable for each component.
- Each component may be realized by a program execution unit such as a CPU or a processor reading and executing a software program recorded on a recording medium such as a hard disk or a semiconductor memory.
- optical disk device 2 may be realized by executing a program by a processor such as a CPU.
- the optical disc device of the present disclosure can be applied as, for example, a BD recorder or the like capable of recording or reproducing information on an optical disc.
- Optical disk device 4 Optical pickup 6, 6A Control unit 8 Optical disk 8a Recording surface 10 First laser light source 12 Second laser light source 14 First beam splitter 15 Second beam splitter 16 Collimeter lens 18 Reflector 20 Front Monitor 22 1/4 wavelength plate 24 Objective lens 26 Lens actuator 28 Cylindrical lens 30 Light receiving element 32 Light receiving signal generation unit 34 Light receiving signal gain adjustment unit 36a, 36b, 36c, 36d Photodiode 38 A / D conversion unit 40 FE signal generation unit 42, 48 AGC circuit 44 Focus control unit 46 TE signal generation unit 50 Tracking control unit 52 RF signal generation unit 54 FS signal generation unit 55 Disc determination unit 56, 56A Dirt determination unit 57 LD type unit
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Abstract
Description
以下、図1~図5を参照しながら、実施の形態1について説明する。
まず、図1及び図2を参照しながら、実施の形態1に係る光ディスク装置2の構成について説明する。図1は、実施の形態1に係る光ディスク装置2の構成を示す図である。図2は、実施の形態1に係る光ディスク装置2の受光素子30を示す図である。
次に、図3~図5を参照しながら、実施の形態1に係る光ディスク装置2の動作について説明する。図3は、実施の形態1に係る光ディスク装置2の動作の流れを示すフローチャートである。図4は、図3のステップS102の処理を具体的に示すフローチャートである。図5は、実施の形態1に係る光ディスク装置2の動作を説明するための図である。
従来の光ディスク装置では、光ピックアップに汚れが発生している場合には、受光素子からの受光信号のピークレベルが低下するため、例えば、FE信号、TE信号、RF信号及びFS信号の各ピークレベルが低下してしまう。その結果、例えばフォーカス制御及びトラッキング制御が正しく行えなかったり、RF信号が劣化したりするなどして、光ディスクに対して情報の記録又は再生を精度良く行うことができなくなる。
本実施の形態では、汚れ判定部56は、例えばディスク判定部55により光ディスク8の種類がBDであると判定された場合であり、且つ、FS信号のピークレベルが汚れ判定用閾値未満である場合に、光ピックアップ4に汚れが発生していると判定し、所定の増幅率を増大させるように受光信号ゲイン調整部34を制御したが、次のように構成してもよい。
[2-1.光ディスク装置の構成]
図6を参照しながら、実施の形態2に係る光ディスク装置2Aの構成について説明する。図6は、実施の形態2に係る光ディスク装置2Aの構成を示す図である。なお、本実施の形態において、上記実施の形態1と同一の構成要素には同一の符号を付して、その説明を省略する。
次に、図7を参照しながら、実施の形態2に係る光ディスク装置2Aの動作について説明する。図7は、実施の形態2に係る光ディスク装置2Aの動作の流れを示すフローチャートである。なお、図7のフローチャートでは、上述した図3のフローチャートの処理と同一の処理には同一のステップ番号を付し、その説明を省略する。
本実施の形態では、汚れ判定部56Aは、ディスク判定部55により光ディスク8の種類がBDであると判定された場合であり、且つ、FS信号のピークレベルが汚れ判定用閾値未満である場合に、光ピックアップ4に汚れが発生していると判定し、第1のレーザ光源10及び第2のレーザ光源12から出射されるレーザ光の強度を増大させるように、第1のレーザ光源10及び第2のレーザ光源12を制御する。
以上のように、本出願において開示する技術の例示として、上記各実施の形態を説明した。しかしながら、本開示における技術は、これに限定されず、適宜、変更、置き換え、付加、省略などを行った実施の形態にも適用可能である。また、上記各実施の形態で説明した各構成要素を組み合わせて、新たな実施の形態とすることも可能である。
4 光ピックアップ
6,6A 制御ユニット
8 光ディスク
8a 記録面
10 第1のレーザ光源
12 第2のレーザ光源
14 第1のビームスプリッタ
15 第2のビームスプリッタ
16 コリメータレンズ
18 反射板
20 フロントモニタ
22 1/4波長板
24 対物レンズ
26 レンズアクチュエータ
28 シリンドリカルレンズ
30 受光素子
32 受光信号生成部
34 受光信号ゲイン調整部
36a,36b,36c,36d フォトダイオード
38 A/D変換部
40 FE信号生成部
42,48 AGC回路
44 フォーカス制御部
46 TE信号生成部
50 トラッキング制御部
52 RF信号生成部
54 FS信号生成部
55 ディスク判定部
56,56A 汚れ判定部
57 LD種別部
Claims (7)
- 光ディスクにレーザ光を照射することにより、前記光ディスクに対して情報の記録又は再生を行う光ディスク装置であって、
レーザ光を出射するレーザ光源と、前記レーザ光源から出射されたレーザ光を前記光ディスク上に収束させる対物レンズと、前記光ディスクからの反射光を受光し、受光した反射光を光電変換することにより受光信号を出力する受光素子と、を含む光ピックアップと、
前記受光素子からの前記受光信号に基づいて、前記光ディスクからの反射光の光量を示す光量信号を生成する光量信号生成部と、
前記光量信号のピークレベルが第1の閾値未満である場合に、前記光ピックアップに汚れが発生していると判定し、前記受光素子からの前記受光信号のピークレベルを増大させるように、前記レーザ光源又は前記受光素子を制御する汚れ判定部と、を備える
光ディスク装置。 - 前記光ディスク装置は、さらに、
前記受光素子からの前記受光信号に基づいて、フォーカスエラー信号を生成するフォーカスエラー信号生成部と、
前記フォーカスエラー信号と前記光量信号との比である正規化フォーカスエラー信号を生成する第1の自動ゲインコントローラと、を備える
請求項1に記載の光ディスク装置。 - 前記光ディスクは、種類の異なる第1の光ディスク及び第2の光ディスクを含み、
前記レーザ光源は、
前記第1の光ディスクに照射するための第1のレーザ光を出射する第1のレーザ光源と、
前記第2の光ディスクに照射するための第2のレーザ光を出射する第2のレーザ光源と、を有し、
前記光ディスク装置は、さらに、前記第1のレーザ光源が第1のレーザ光を出射した際に、前記正規化フォーカスエラー信号の両振幅と第2の閾値との比較に基づいて、前記光ディスクの種類が前記第1の光ディスクであるか否かを判定するディスク判定部を備え、
前記汚れ判定部は、前記ディスク判定部により前記光ディスクの種類が前記第1の光ディスクであると判定された場合であり、且つ、前記光量信号のピークレベルが前記第1の閾値未満である場合に、前記光ピックアップに汚れが発生していると判定する
請求項2に記載の光ディスク装置。 - 前記受光素子は、
前記光ディスクからの反射光を受光し、受光した反射光を光電変換することにより、前記受光信号を生成する受光信号生成部と、
生成された前記受光信号を所定の増幅率で増幅する受光信号ゲイン調整部と、を有し、
前記汚れ判定部は、前記ディスク判定部により前記光ディスクの種類が前記第1の光ディスクであると判定された場合であり、且つ、前記光量信号のピークレベルが前記第1の閾値未満である場合に、前記光ピックアップに汚れが発生していると判定し、前記所定の増幅率を増大させるように前記受光信号ゲイン調整部を制御する
請求項3に記載の光ディスク装置。 - 前記汚れ判定部は、前記ディスク判定部により前記光ディスクの種類が前記第1の光ディスクであると判定された場合であり、且つ、前記光量信号のピークレベルが前記第1の閾値未満である場合に、前記光ピックアップに汚れが発生していると判定し、前記レーザ光源から出射されるレーザ光の強度を増大させるように前記レーザ光源を制御する
請求項3に記載の光ディスク装置。 - 前記光ディスク装置は、さらに、
前記受光素子からの前記受光信号に基づいて、トラッキングエラー信号を生成するトラッキングエラー信号生成部と、
前記トラッキングエラー信号と前記光量信号との比である正規化トラッキングエラー信号を生成する第2の自動ゲインコントローラと、を備える
請求項1~5のいずれか1項に記載の光ディスク装置。 - 請求項1~6のいずれか1項に記載の光ディスク装置を備えた
録画再生装置。
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Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0765389A (ja) * | 1993-08-30 | 1995-03-10 | Canon Inc | サーボループの自動利得制御装置 |
JP2005149703A (ja) * | 2003-10-23 | 2005-06-09 | Matsushita Electric Ind Co Ltd | 情報担体装置および情報担体起動方法 |
JP2006228401A (ja) | 2005-01-24 | 2006-08-31 | Matsushita Electric Ind Co Ltd | ディスク判別方法及びディスク判別装置 |
JP2007122850A (ja) * | 2005-09-28 | 2007-05-17 | Matsushita Electric Ind Co Ltd | 光ディスク装置 |
JP2009283100A (ja) | 2008-05-26 | 2009-12-03 | Sony Computer Entertainment Inc | 光ディスク装置、その制御方法、プログラム及び情報記憶媒体 |
JP2011008855A (ja) * | 2009-06-25 | 2011-01-13 | Hitachi Ltd | ディスク装置、およびディスク装置の信号処理方法 |
JP2012190505A (ja) * | 2011-03-10 | 2012-10-04 | Panasonic Corp | 光ディスク装置およびレーザー出力制御方法 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03263620A (ja) * | 1990-03-13 | 1991-11-25 | Pioneer Electron Corp | ディスクプレーヤのサーボ装置 |
WO1999040583A1 (fr) * | 1998-02-03 | 1999-08-12 | Matsushita Electric Industrial Co., Ltd. | Procede servant a identifier un type de disque |
JP4583328B2 (ja) * | 2006-02-28 | 2010-11-17 | パナソニック株式会社 | 光ディスク装置および光ディスク判別方法 |
-
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- 2021-10-06 JP JP2022557400A patent/JPWO2022080202A1/ja active Pending
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0765389A (ja) * | 1993-08-30 | 1995-03-10 | Canon Inc | サーボループの自動利得制御装置 |
JP2005149703A (ja) * | 2003-10-23 | 2005-06-09 | Matsushita Electric Ind Co Ltd | 情報担体装置および情報担体起動方法 |
JP2006228401A (ja) | 2005-01-24 | 2006-08-31 | Matsushita Electric Ind Co Ltd | ディスク判別方法及びディスク判別装置 |
JP2007122850A (ja) * | 2005-09-28 | 2007-05-17 | Matsushita Electric Ind Co Ltd | 光ディスク装置 |
JP2009283100A (ja) | 2008-05-26 | 2009-12-03 | Sony Computer Entertainment Inc | 光ディスク装置、その制御方法、プログラム及び情報記憶媒体 |
JP2011008855A (ja) * | 2009-06-25 | 2011-01-13 | Hitachi Ltd | ディスク装置、およびディスク装置の信号処理方法 |
JP2012190505A (ja) * | 2011-03-10 | 2012-10-04 | Panasonic Corp | 光ディスク装置およびレーザー出力制御方法 |
Non-Patent Citations (1)
Title |
---|
See also references of EP4231297A4 |
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