WO2005034112A1 - 光ピックアップの駆動装置、光ピックアップのフォーカス引き込み方法 - Google Patents
光ピックアップの駆動装置、光ピックアップのフォーカス引き込み方法 Download PDFInfo
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- WO2005034112A1 WO2005034112A1 PCT/JP2004/014673 JP2004014673W WO2005034112A1 WO 2005034112 A1 WO2005034112 A1 WO 2005034112A1 JP 2004014673 W JP2004014673 W JP 2004014673W WO 2005034112 A1 WO2005034112 A1 WO 2005034112A1
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- level voltage
- slice level
- optical
- reference potential
- error signal
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Classifications
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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
- 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
- G11B19/02—Control of operating function, e.g. switching from recording to reproducing
- G11B19/12—Control of operating function, e.g. switching from recording to reproducing by sensing distinguishing features of or on records, e.g. diameter end mark
- G11B19/127—Control of operating function, e.g. switching from recording to reproducing by sensing distinguishing features of or on records, e.g. diameter end mark involving detection of the number of sides, e.g. single or double, or layers, e.g. for multiple recording or reproducing layers
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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
- 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
- G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
- G11B2007/0009—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage
- G11B2007/0013—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage for carriers having multiple discrete layers
-
- 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
- G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
- G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
- G11B7/08511—Methods for track change, selection or preliminary positioning by moving the head with focus pull-in only
Definitions
- the present invention relates to a drive device for an optical pickup used in an optical information recording / reproducing device (optical information device) for recording / reproducing or erasing information stored on an optical information recording medium such as an optical disk. This is related to the focus pull-in method and the like.
- Optical memory technology that uses optical disks with pit-shaped patterns as high-density and large-capacity storage media has been put to practical use while expanding its applications with digital audio disks, video disks, document file disks, and data files. I have.
- the function of successfully recording and reproducing information on an optical disk through a minutely focused light beam with high reliability is a condensing function that forms a diffraction-limited micro spot, and an optical system. Focus control (focus servo) and tracking control, and pit signal (information signal) detection.
- the second-generation DVD uses red light (wavelength ⁇ 2 from 630 nm to 680 ⁇ , standard wavelength 650 nm), and an objective lens of NAO.6, and the substrate thickness of the disc is 0.6 mm.
- Third-generation optical disks use blue light (wavelength: ⁇ 390 ⁇ to 415 ⁇ , standard wavelength 405 nm), and an objective lens of NAO.85, and the base material of the disk is 0.1 mm.
- the base material thickness refers to a distance from a surface on which an optical beam is incident on an optical disk as an information recording medium to an information recording surface of the optical disk.
- a multi-layered optical disc having two or more recording layers is being supplied or studied.
- FIG. 10 shows an optical information device for recording and reproducing information on and from a two-layer optical disk according to a conventional technique.
- the two-layer optical disk 109 is put on a turntable 182 and rotated by a motor 164 as a rotating system.
- the optical head device 155 is roughly moved by the drive device 151 of the optical head device up to a track on the two-layer optical disc 109 where desired information exists.
- the optical head device 1 55 also corresponds to the positional relationship with the double-layer optical disc 109. Then, a focus error signal and a tracking error signal are sent to the electric circuit 153.
- the electric circuit 153 sends a signal for finely moving the objective lens to the optical head device 155 in response to this signal. With this signal, the optical head device 155 performs focus control and tracking control on the two-layer optical disc 109, and the optical head device 155 reads, writes, or erases information.
- FIG. 11 is a flowchart showing a focus pull-in method in a conventional two-layer optical disc
- FIG. 12 is a diagram showing a focus error signal waveform
- FIG. 13 is a diagram showing the optical disc and the objective lens in focus pull-in in a conventional two-layer optical disc. It is a figure which shows the positional relationship of.
- reference numeral 120 denotes a two-layer optical disc having a two-layer structure in which an information recording layer includes a first layer 120b and a second layer 120c, and 130 denotes an objective lens.
- Reference numeral 170 denotes a focus driving device that drives the objective lens 130 in a direction perpendicular to the main surface including the surface 120a of the two-layer optical disc 120, and corresponds to the driving device 151 in FIG. Further, as shown in FIG. 12, the focus error signal has a level voltage that is positive or negative in the vicinity of the recording surface with respect to a predetermined reference voltage E in accordance with the distance between the objective lens 130 and the two-layer optical disc 120. Is a signal that fluctuates.
- a focus jump is performed to point D in FIG. 11 which is the position of the focal point of the first layer 120c (S107).
- This operation is performed on the first layer 120b shown in FIG. 13 (b).
- the movement of the objective lens 130 from the retracted state to the retracted state into the first layer 120c shown in FIG. 13 (c) is performed), and the first layer 120 shown in the waveform A of FIG.
- the focus servo is started using the focus error signal of c as a control signal (S108), and data read of the second layer is performed (S109).
- Japanese Patent Application Laid-Open No. Hei 9-161284 discloses a focus pull-in method for performing data access in a shorter time in a drive device that performs recording and reproduction on a two-layer optical disk. Note that the configuration of the optical information device that performs focus pull-in is the same as that of the conventional example shown in FIG. 10, and only the control operation is different.
- FIG. 14 is a flow chart showing a focus pull-in method of a conventional double-layer optical disc
- FIG. 15 is a diagram showing a focus error signal waveform
- FIG. 13 is a double-layer optical disc 120 and an objective lens 13 during focus pull-in.
- FIG. 3 is a diagram showing a positional relationship between the two.
- the laser diode When a command to reproduce the double-layer optical disc 120 is issued (S201), the laser diode is caused to emit light (the initial state shown in FIG. 12A) (S202). After that, the focus lens 170 moves the objective lens 130 in the vertical direction within a predetermined distance range with respect to the information recording surface of the two-layer optical disc 120 (S203). As the objective lens 130 moves, the electric circuit 15 3 starts detecting the focus error signal of the first layer 120 b shown in the signal waveform A of FIG. 15 ( S 204), a period G during which the level voltage of the focus error signal is smaller than the predetermined slice level voltage F for focus error signal detection of the first layer 122 is detected.
- the focus error signal C of the first layer 120c shown in the signal waveform C of FIG. 15 is monitored, and the objective lens 130 corresponds to the focal point D of the first layer 120c.
- the focus servo is started with the second layer focus error signal C as a control signal (S208), and the data read of the second layer is performed (S206). 209).
- the conventional focus pull-in method has the following problems. That is, as shown in FIG. 15, the detection of the focus error signals of the first layer 120b and the first layer 120c is performed by detecting the waveforms A and B. Alternatively, the detection is performed by detecting a level voltage at a predetermined displacement position from the focus error signal reference voltage E. At this time, for example, if the reflectance of the first layer 120c is low and the peak or level voltage corresponding to the focus error signal of the first layer 120c cannot be detected, the focus of the second layer forever The objective lens 130 may continue to move in search of an error signal and hit the optical disk 120, which may damage the objective lens 130 and the optical disk 120.
- the focus error signal is erroneously recognized as the focus error signal of the first layer, and the objective lens 130 keeps moving in search of the focus error signal of the first layer 120c forever (not present). And eventually light The objective lens 130 and the optical disk 120 may be damaged due to the collision with the disk 120. Disclosure of the invention
- the present invention has been made in view of the above problems, and provides an optical pickup drive apparatus and an optical pickup focusing method that can quickly and reliably focus on the deepest recording layer of a multilayer disc. It is intended to provide.
- a first aspect of the present invention is to provide an objective lens for focusing an optical spot on the recording surface of an optical information recording medium having a single-layer recording surface or a plurality of multilayered recording surfaces.
- the control means moves the objective lens in a direction toward the recording surface, and detects that the level voltage of the focus error signal reaches a first slice level voltage displaced by a predetermined amount from a reference potential. Then, the objective lens is moved closer to the recording surface with the predetermined movement amount as an upper limit, and when the movement amount of the objective lens reaches the predetermined movement amount, the objective lens is moved away from the recording surface in a direction away from the recording surface. Controlling the moving means so that
- the objective lens detects that the level voltage of the focus error signal has reached a second slice level voltage displaced by a predetermined amount from a reference potential during the period in which the objective lens moves away, the light spot is focused.
- Optical pickup drive device that controls the pull-in for the optical pickup.
- the level voltage of the focus error signal is increased by a predetermined amount from the reference potential before the moving amount of the objective lens reaches the predetermined moving amount.
- a driving device for an optical pickup according to a first aspect of the present invention which performs a pull-in control for focusing a light spot when newly detecting that a displaced third slice level voltage has been reached.
- the level voltage of the focus error signal fluctuates positively or negatively with respect to the reference potential in accordance with the movement of the objective lens;
- An optical pickup drive according to the first or second aspect of the present invention which detects, as the voltage, either a higher voltage or a lower voltage than the reference potential.
- control means uses, as the first slice level voltage, a higher voltage or a lower voltage whichever is detected first, whichever is higher than the reference potential.
- the level voltage of the focus error signal varies positively or negatively with respect to the reference potential in accordance with the movement of the objective lens.
- the optical pickup drive according to the first or second aspect of the present invention, wherein the control unit detects both a higher voltage and a lower voltage than the reference potential as the first slice level voltage. .
- the control means detects, as the second slice level voltage or the third slice level voltage, one of a higher voltage and a lower voltage than the reference potential
- FIG. 1 is an optical pickup drive device according to the first or second aspect of the present invention.
- control means may be arranged so that, as the second slice level voltage or the third slice level voltage, a voltage higher or lower than the reference potential is earlier than the reference voltage.
- This is a driving device for the optical pickup according to the sixth aspect of the present invention, which uses the detected one.
- the displacement of the first slice level voltage, the second slice level voltage, and the third slice level voltage from the reference potential is substantially the same.
- the magnitude of the displacement of the first slice level voltage from the reference potential is determined by comparing the magnitude of the displacement of the second slice level voltage and the third slice level voltage from the reference potential.
- a first or second drive device for an optical pickup according to the present invention which is larger than the magnitude of displacement.
- a tenth aspect of the present invention is the optical pickup according to the ninth aspect, wherein displacements of the second slice level voltage and the third slice level voltage from the reference potential are substantially the same.
- the driving device is the optical pickup according to the ninth aspect, wherein displacements of the second slice level voltage and the third slice level voltage from the reference potential are substantially the same.
- the predetermined moving amount is given by a moving distance L of the optical pickup from a current position when the first slice level voltage is reached,
- the moving distance L is
- a first or second drive device for an optical pickup of the present invention is a first or second drive device for an optical pickup of the present invention.
- control unit may be configured such that a level voltage of the focus error signal is greater than a displacement of the first slice level voltage from the reference potential.
- a drive device for an optical pickup according to the first or second aspect of the present invention which controls pull-in for focusing a light spot when detecting that a slice level voltage has been reached.
- a thirteenth aspect of the present invention is the control device, wherein the control means is formed on an integrated circuit.
- a fifteenth aspect of the present invention is an optical information reproducing apparatus provided with a reading means for reading information recorded on an optical information recording medium,
- the reading means is an optical information reproducing apparatus using the optical pickup drive of the first or second aspect of the present invention.
- a fifteenth aspect of the present invention is an optical information recording apparatus comprising a recording unit for recording information on an optical information recording medium,
- the recording means is an optical information recording device using the optical pickup driving device of the first or second invention.
- a sixteenth aspect of the present invention is an optical information recording / reproducing apparatus including recording / reproducing means for recording and Z or reproducing information on an optical information recording medium,
- the recording / reproducing means is an optical information recording / reproducing apparatus using the optical pickup drive of the first or second aspect of the present invention.
- a seventeenth aspect of the present invention provides an optical information recording medium having a single-layer recording surface or a plurality of recording surfaces having a plurality of recording surfaces.
- a focus pull-in method of an optical pickup for focusing on a recording surface
- the controlling step includes:
- the objective lens When the objective lens is moved in a direction toward the recording surface, and it is detected that the level voltage of the focus error signal has reached a first slice level voltage displaced by a predetermined amount from a reference potential, The objective lens is moved closer to the recording surface with a predetermined movement amount as an upper limit. Controlling the moving process so that
- the objective lens detects that the level voltage of the focus error signal has reached a second slice level voltage displaced by a predetermined amount from a reference potential during the period in which the objective lens moves away, the light spot is focused.
- This is a focus pull-in method for an optical pickup that controls pull-in for the camera.
- the level voltage of the focus error signal is increased by a predetermined amount from the reference potential before the movement amount of the movement of the objective lens reaches the predetermined movement amount.
- the level voltage of the focus error signal varies positively or negatively with respect to the reference potential in accordance with movement of the objective lens
- the control step includes:
- a seventeenth or eighteenth aspect of the present invention is a focus pull-in method for an optical pickup according to the present invention, wherein either the higher voltage or the lower voltage than the reference potential is detected.
- control step uses, as the first slice level voltage, a voltage higher or lower than the reference potential, whichever is detected first.
- 19 is a focus pull-in method of the optical pickup of the present invention.
- control step fluctuates positively or negatively with respect to the reference potential
- control step includes, as the first slice level voltage, a voltage that is higher or lower than the reference potential.
- a seventeenth or eighteenth aspect of the present invention is a focus pull-in method for an optical pickup according to the present invention.
- the second slice level voltage or the third slice level voltage is higher than the reference potential.
- a seventeenth or eighteenth aspect of the present invention is a focus pull-in method for an optical pickup according to the present invention, which detects either the first voltage or the lower voltage.
- a voltage higher than the reference potential or a voltage lower than the reference potential may be set earlier. 22 is a focus pull-in method of the optical pickup according to the second embodiment of the present invention, using the detection method.
- the displacement of the first slice level voltage, the second slice level voltage, and the third slice level voltage from the reference potential is substantially the same.
- a certain one of the seventeenth and eighteenth inventions is a focus pull-in method for the optical pickup of the present invention.
- the magnitude of the displacement of the first slice level voltage from the reference potential is determined from the reference potential of the second slice level voltage and the third slice level voltage.
- a focus pull-in method for an optical pickup according to the seventeenth or eighteenth aspect of the present invention which is larger than the magnitude of the displacement of the optical pickup.
- a twenty-sixth aspect of the present invention is a light source according to the twenty-fifth aspect, wherein displacements of the second slice level voltage and the third slice level voltage from the reference potential are substantially the same. This is the focus pull-in method of the pickup.
- the predetermined amount of movement is given by a moving distance L of the optical pickup from a current position when the first slice level voltage is reached,
- the moving distance L is
- the 17th or 18th focus pull-in method of the optical pickup of the present invention It is.
- a level voltage of the focus error signal is greater than a displacement of the first slice level voltage from the reference potential.
- a twentieth aspect of the present invention is the optical pickup driving device according to the first aspect of the present invention, wherein the control unit controls the moving unit based on a level voltage of a focus error signal based on light reflected from the light spot.
- Q is a program to make a computer function
- a thirtieth aspect of the present invention is a recording medium carrying the program of the twenty-ninth aspect of the present invention, which is a recording medium processable by a computer.
- the present invention has a remarkable effect that the focus can be pulled into the deepest recording layer of the multilayer disc in a short time and reliably.
- FIG. 1A is a schematic sectional view of an optical information device according to Embodiments 1 to 6 of the present invention.
- FIG. 1B is a block diagram of an electric circuit 53 of the optical information device according to the first to sixth embodiments of the present invention.
- FIG. 2 is a flowchart showing a focus pull-in method according to the first embodiment of the present invention.
- FIG. 3 is an explanatory diagram showing a relationship between a focus error signal and a slice level voltage according to the first to fourth embodiments of the present invention.
- FIGS. 4 (a) ′ (b), (c) and (d) are schematic sectional views showing the positional relationship between the optical disc and the objective lens in each embodiment of the present invention.
- FIG. 5 is an explanatory diagram showing a relationship between a focus error signal and a slice level voltage according to the fifth and sixth embodiments of the present invention.
- FIG. 6 is a schematic perspective view showing a configuration of a computer according to Embodiment 7 of the present invention.
- FIG. 7 is a schematic perspective view showing a configuration of an optical disc player and a car navigation system according to Embodiment 8 of the present invention.
- FIG. 8 is a schematic perspective view showing the configuration of the optical disc recorder according to the embodiment of the present invention.
- FIG. 9 is a schematic perspective view showing the configuration of the optical disk server according to the embodiment of the present invention.
- FIG. 10 is a schematic sectional view of a conventional optical information device.
- FIG. 11 is a flowchart showing a conventional focus pull-in method.
- FIG. 12 is an explanatory diagram showing a focus error signal of a conventional example.
- FIGS. 13 (a), 13 (b), and 13 (c) are schematic cross-sectional views showing the positional relationship between an optical disc and an objective lens in a conventional example.
- Fig. 14 is a flowchart showing a conventional focus pull-in method.
- FIG. 15 is an explanatory diagram showing a relationship between a focus error signal and a slice signal in a conventional example.
- FIG. 1A shows an optical information device according to Embodiment 1 of the present invention.
- the optical disk 9 is placed on a turntable 82 and rotated by a motor 64.
- the optical head device 55 is roughly moved by the drive device 51 of the optical head device up to the track where desired information exists on the optical disk.
- the optical head device 55 sends a focus error signal or a tracking error signal to the electric circuit 53 in accordance with the positional relationship with the previous optical disk 10.
- the electric circuit 53 responds to this signal by moving the objective lens to the optical head device 55. Send a signal to move. With this signal, the optical head device 55 performs focus control and tracking control on the optical disk 9, and the optical head device 55 reads, writes, or erases information.
- FIG. 1B is a diagram schematically showing the inside of the electric circuit 53.
- the determination circuit 53a includes means for determining whether the focus error signal or the tracking error signal obtained from the optical head device 155 has reached a predetermined level voltage
- the control circuit 53b is a means for controlling each part of the optical head device 55, and is a means for performing control based on the judgment from the judgment circuit 53a when there is a judgment.
- the memory 53c is a means for storing the determination result of the determination circuit 53a as a history.
- FIG. 2 is a flowchart showing a focus pull-in method for a two-layer optical disc according to an embodiment of the present invention.
- FIG. 3 is a diagram showing a focus error signal waveform detected by an optical head device 55.
- FIG. 4 is a diagram showing a positional relationship between the two-layer optical disc 121 and the objective lens 131 when focusing is performed.
- the judgment means 5 3b of the electric circuit 53 moves the objective lens 13 1
- the focus error signal detected during movement is monitored.
- the level voltage of the focus error signal depends on the distance between the objective lens 13 1 and the optical disk 9, and the disk surface 12 1 a, the first layer 12 1 b, and the second layer 1 In the vicinity of 2 c, the reference voltage E fluctuates positively and negatively, respectively.
- the judgment means 53 b first determines that the level voltage of the focus error signal is a predetermined slice level voltage G for focus error signal detection. The smaller time point ⁇ is detected (S4), and the detection is stored as a history in the memory 53c in the electric circuit 53. Subsequently, in response to this detection, the control means 53b sets a limit value (L) im of the movable amount of the objective lens 13 1 ( S5 ).
- the absolute value of the difference between the focus error signal detection slice level voltage G and the reference voltage E be 1 Z3 to 2/3 of the standard focus error signal voltage amplitude. It is detected in the state of FIG. 4 (a) that the focus error signal of the optical disk surface 121 a shown by the waveform J in FIG. 3 is erroneously recognized as the focus error signal of the first layer 122 b. To avoid. The objective lens 13 1 continues to move close to the optical disk 9, but the determining means 53 b of the electric circuit 53 determines that the level voltage of the focus error signal is the slice level voltage G for detecting the focus error signal during this time. It is determined whether it has become smaller (S6).
- the focus servo control is turned ON for the first time (S7).
- the detection time point is ⁇ on the waveform C of the focus error signal of the second layer 121 c.
- the in-focus point D of the second layer 122c is detected (S8), and the focus servo is started using the focus error signal of the second layer 122 shown in the waveform C of FIG. 3 as a control signal.
- data read is performed (S10). Whether the recorded information is of the second layer 1 2 1 c or not is indicated by the diagram connected to the optical information device.
- the information processing device or electric circuit 53 does not determine the content of the data read by the data read (S13), if the content is correct, the data read is continued (S13). 15) If an error is found, the control means 53b performs control for performing a focus jump again (S14), and performs data reading of the second layer 121c again (S15).
- the focus jump is performed by turning off the focus servo, moving the objective lens 13 1 closer to the optical disc 9, and when the focus error signal level changes by a certain amount or more with respect to the reference voltage, the focus servo is restarted. Turn on. At this time, by setting a voltage having a difference from the reference voltage smaller than the slice level voltage G as a new slice level voltage, a reliable jump is performed. In the case of an optical disc having three or more recording layers, a desired recording layer can be reached by repeating the focus jump.
- the judging means 5 3b of the electric circuit 53 monitors the focus error signal detected while the objective lens 13 1 is moving away from the objective lens 13 and judges again whether or not it becomes lower than the focus error signal detection slice level voltage G. If it becomes smaller, that point is detected (S12). After the detection, the operations of steps S7 to S15 are performed, and data reading from the second layer 12c is performed.
- the limit value ( Lim ) of the movable amount is set by that, and as shown in FIG. Location ), And if no new focus error signal is detected
- the objective lens 1 3 1 starts moving away.
- the focus pull-in state after the separation movement is divided as follows according to the detection state of the focus error signal.
- a peak or level voltage corresponding to the focus error signal of the first layer 121 b is detected, but a peak level voltage corresponding to the focus error signal of the second layer 121 c cannot be detected.
- the determination means 53b determines that the focus error signal has become smaller than the focus error signal detection slice level voltage G at the time y in the figure, and the focus servo is turned on (S7).
- the operation is performed in the order of S8 to S13 and S15, and the data read of the second layer 121c is executed. That is, the optical head device 55 is connected to the first layer 12 1 Focus error signal of b
- the focus error signal of the second layer 1 2 2 is erroneously recognized as the focus error signal of the first layer.
- the focus error signal has become smaller than the focus error signal detection slice level voltage G, and the focus servo is turned on (S7).
- the operations are performed in the order of S9 to S13 and S15, and the data read of the second layer 121c is executed. That is, the optical head device 55 detects the focus point D by detecting the focus error signal of the second layer 121 c twice, and forms the light. As a result, the data read of the second layer 121c can be executed.
- a limit value is set for the amount of movement of the objective lens 131, and thereafter, the objective lens 131 is moved in the opposite direction. Is moved to detect the focus error signal again, thereby avoiding collision between the objective lens 131 and the optical disk 121, and reliably detecting the focus error signal multiple times, directly to the second layer. Focus servo can be applied in a short time.
- the limit value ( Lim ) of the movable amount of the objective lens 13 1 is, in principle, based on the position at the start of the operation of the optical head device 55 and the optical lens 13 1 Although any distance can be set to the position in contact with the surface of 121, it is desirable to eliminate unnecessary movement for quick focus pull-in.
- a moving distance L from the current position at the time of the first focus error signal detection is determined, and after approaching only by this moving distance, it is turned to move away. did. That is, the moving distance L is the maximum value d of the distance between the two layers (between the first layer 121 b and the second layer 121 c) in the two-layer optical disc 121 and the refractive index n of the substrate material of the optical disc 121. And further reduce the sensitivity error c of the optical head device 55 by c. That is, the moving distance L from the first focus error signal detection point is determined by using these parameters.
- c is about 0.1 to 0.3.
- working distance-WD the distance between the surface of the objective lens 131 near the disc and the surface of the optical disc 121 when focusing on the first layer 121b.
- > L to keep the objective lens constant WD> L is desirable because the effect of not hitting the disk during the movement of L can be obtained.
- the embodiment has been described with respect to a two-layer disc.
- the same operation as described above can be applied to a multi-layer disc having three or more layers as long as the recording surface to be focused is located at the deepest part of the optical disc.
- the recording can be quickly performed on the deepest recording layer.
- the moving distance L may be defined as follows. That is, L may be set to a value obtained by dividing the maximum value d of the distance between the four layers by the refractive index n of the optical disk, and further reducing the sensitivity error c of the drive device 51 by c. That is, similar to the above equation,
- the focus servo control is performed immediately when the focus error signal exceeds the slice level voltage g while the objective lens is moving a fixed amount L ( NL -1) times. By turning ON, it is possible to draw the focus more quickly.
- the optical disc is a multilayer disc with three or more layers
- the focus can be directly drawn into a desired recording layer, and the collision between the objective lens and the optical disk can be avoided.
- the slice level voltage used for detecting the focus error signal of each recording layer is set to use the level voltage G lower than the reference voltage E, but the slice level voltage is limited to this. It's not something.
- the judging means 53a uses a slice level voltage H higher than the reference voltage E, and determines when the focus error signal to be monitored first becomes higher than the slice level voltage H by S The first focus error signal detection in 4 may be performed. In this case, as shown in FIG. 3, when the focus error signal is detected for the first time and the limit value (L lim ) of the movable amount of the objective lens 13 1 of S5 is set at the time point ⁇ in the figure. Will be When the objective lens 13 1 detects the second focus error signal, the point becomes the point ⁇ in the figure.
- the above-described slice level voltages G and ⁇ may be respectively used at the time of the first focus error signal detection and at the time of the second focus error signal detection.
- the operation in this case is as follows.
- the slice level voltage G is used in the first focus error signal detection, and the slice level voltage ⁇ is used in the second focus error signal detection.
- the time between the detection of one signal and the detection of the second focus error signal can be shortened, enabling quick focus pull-in.
- the above-mentioned slice level voltages G and H are respectively determined for the departure movement due to the setting of the limit value (L lim ) of the movable amount and the approach movement before that. It may be used.
- the operation in this case is as follows.
- the slice level voltage G is used to detect the focus error signal when approaching and the slice level voltage H is used to detect the focus error signal when moving away.
- the slice level When detecting a focus error signal during approach movement, the slice level The slice level voltage G is used for detecting the focus error signal of the moving away from the object using the voltage H.
- the combination of the slice level voltages H and G is described as being used once each in detecting the focus error signal, but the focus pull-in operation is actually performed. Therefore, it is desirable to prioritize minimizing the time required for detection.
- the fastest is at time ⁇
- the fastest is-.
- both the slice level voltages G and ⁇ described above may be used at the time of the first focus error signal detection and at the time of the second focus error signal detection.
- the operation in this case is as follows. That is, at the time of the first focus error signal detection and setting of the limit value (L i im ) of the movable amount of the objective lens 13 1 of S5, check the time point ⁇ in the figure. After that, the second focus error signal is detected when there is no separation movement due to the setting of the limit value (L lim ) of the movable amount of the objective lens 131. The time is determined at time y after confirming time ⁇ in the figure. In addition, the point at which the second forcing force signal is detected when there is a reversing movement is performed at point ⁇ ⁇ ⁇ after confirming point ⁇ in the figure.
- the magnitude of the above-mentioned slice level voltage is determined between the separation movement caused by the setting of the limit value (L! Im) of the movable amount and the approach movement until then. You may make it different. That is, the magnitude of the slice level voltage used when detecting the focus error signal at the time of the separation movement may be made smaller than the magnitude of the slice level voltage at the time of detecting the first focus error signal. As shown in FIG. 4, when the focus error signal is detected using the slice level voltage H, the first focus error signal detection is performed at time ⁇ .
- the second focus error signal detection should normally be performed at time ⁇ , but if something goes wrong, the objective lens 13 1 can move as set when the first focus error signal is detected After moving to the point (a) based on the quantity limit (L lim ), the robot moves away in the opposite direction and attempts to detect again during this time.
- the detection is performed at the time point ⁇ shown in FIG. Failure to move, for example, in the second layer 1 2 1 c
- the focus error signal cannot be detected even when moving away from the target because the level voltage of the focus error signal itself does not reach the slice level voltage H, as indicated by the broken line in FIG. That is what happens.
- the determination means 53 a sets the slice level voltage to a voltage H lower than the slice level voltage H with respect to the reference voltage E.
- the point at which the focus error signal to be monitored becomes higher than this new slice level voltage H 1 () W is determined, and focus detection is performed using the focus error signal at this time.
- the time point ⁇ ′ shown in the figure is the judgment point.
- the magnitude of the slice level voltage at the time of the separation movement is set smaller than that at the time of the close movement, so that the focus error signal of the second layer can be detected more reliably. Focus pull-in can be performed quickly.
- the slice level voltage H! the slice level voltage H! .
- the slice level voltage G when the first focus error signal is detected, the slice level voltage G high (not shown) higher than the slice voltage G with respect to the reference voltage E May be used.
- a slice level voltage that has a smaller displacement than the displacement of the slice level voltage used for the first detection from the reference potential may be set.
- the slice level voltages G and H are used properly, and when both are used, the slice level voltage H is detected for the second focus error signal detection at the time of separation movement or approach movement. w and G high may be used respectively.
- the slice level voltage H "w is used for detecting a focus error signal when moving away from each other, but may be used for detecting a second focus error signal when moving close.
- the focus error signal can be detected at time ⁇ ′ in FIG.4, and the focus pull-in can be performed more quickly without the necessity of moving away from each other.
- the displacement of the slice level voltage used at the time of detecting the second focus error signal is smaller than the displacement from the reference potential, the reference voltage at the time of approaching movement and at the time of separating movement is detected at the time of the second focus error signal detection.
- the displacement from ⁇ may be different from each other.
- the reflectivity of the recording layer is higher and the level voltage of the focus error signal is higher than in the case of a multi-layer disc.
- Set H high where the displacement from E is higher than the slice level voltage H used for the first focus error signal detection.
- both the slice level voltages H high and G w may be set and detected.
- optical information recording device As examples of the optical information recording device, the optical information reproducing device, and the optical information recording / recording device of the present invention, embodiments of a computer or the like including the optical information device 67 described in Embodiments 1 to 6 will be described below. Show.
- a computer, an optical disk player, or an optical disk recorder equipped with the optical information device of the above-described embodiment or employing the above-described recording and reproducing method can focus on a desired recording layer of a multilayer optical disk in a short time. Since the pull-in can be performed and the collision between the objective lens and the optical disk can be prevented, an easy-to-use system with little waiting time when starting to use the optical disk can be realized.
- an optical information device 67 of the first to sixth embodiments an input device 65 realized by a keyboard or a mouse or a touch panel for inputting information, and information input from the input device 65
- a computing device 64 implemented by a central processing unit (CPU) that performs computations based on information read from the optical device 67, and information such as results computed by the computing device 64.
- a computer 100 including an output device 61 realized by a cathode ray tube, a liquid crystal display device, a printer, or the like for displaying the image.
- an optical disc device having the optical information device 67 of the first to sixth embodiments and a decoder 66 as a device for converting an information signal obtained from the optical information device 67 into an image into an image is provided.
- Make up 7 This configuration can also be used as a car navigation system. Further, a mode in which a display device 120 such as a liquid crystal monitor is added is also possible.
- Embodiments of an optical disc recorder provided with the optical information devices described in Embodiments 1 to 6 are described below.
- an optical information device 67 of the seventh embodiment, and an image-to-information conversion device for converting image information into information to be recorded on an optical disk by the optical information device 67 are:
- An optical disk recorder having 8 is constructed.
- a decoder 166 as a device for converting an information signal obtained from the optical information device 67 into an image to convert the information signal into an image, it is also possible to reproduce an already recorded portion.
- An output device 61 implemented as a cathode ray tube, a liquid crystal display device, a printer, or the like for displaying information may be provided. .
- an optical information device 67 is the optical information device described in the first to sixth embodiments.
- the input / output terminal 69 is a wired or wireless input / output terminal for taking in information to be recorded in the optical information device 67 and outputting information read by the optical information device 67 to the outside.
- information can be exchanged with a network, that is, a plurality of devices, for example, a computer, a telephone, a TV tuner, and the like, and used as an information server (optical disk server) shared by the plurality of devices.
- a network that is, a plurality of devices, for example, a computer, a telephone, a TV tuner, and the like, and used as an information server (optical disk server) shared by the plurality of devices.
- An output device 61 realized as a brown-tube liquid crystal display device, a printer, or the like for displaying information may be provided. Further, by providing the changer 13 1 for putting a plurality of optical discs into and out of the optical information device 67, it is possible to obtain an effect of recording and storing a lot of information.
- the output device 61 and the LCD monitor 120 are shown in FIGS. 6 to 9 in the above-described seventh to tenth embodiments, a configuration having only an output terminal for connecting to the output device 61 or the liquid crystal monitor 120 may be adopted. . In this case, the output device 61 and the liquid crystal monitor 120 are not provided, and can be separately prepared as needed. Further, although the input device is not shown in FIGS. 117 and 8, a form including an input device such as a keyboard touch panel, a mouse, and a remote control device is also possible. Conversely, in Embodiments 7 to 10 described above, it is also possible to provide an input device separately and have only an input terminal for connecting to the input device.
- the optical head device 55 including the focus driving device 17 1 corresponds to the moving means of the present invention
- the objective lens 13 1 corresponds to the objective lens of the present invention
- the electric circuit 53 corresponds to the control means of the present invention.
- 'Slice level voltages H, G, etc. used for the first focus error signal detection in S4 correspond to the first slice level voltage of the present invention
- the approach in S6 The slice level voltages such as the slice level voltages H and G used for the second focus error signal detection during the movement correspond to the second slice level voltage of the present invention, and the second focus error during the separation movement.
- the slice level voltages such as the slice level voltages H and G used for signal detection correspond to the third slice level voltage of the present invention.
- the slice level voltage such as w corresponds to the fourth slice level voltage of the present invention.
- the personal computer 100, the optical disk recorder 110, and the optical disk server 130 correspond to the optical information reproducing apparatus, the optical information recording apparatus, and the optical information recording / reproducing apparatus of the present invention, respectively. It corresponds to an optical information reproducing device.
- the use of an integrated circuit such as a semiconductor integrated circuit as the electric circuit 53 enables downsizing, constant power consumption, and improved reliability.
- a program according to the present invention is a program for causing a computer to execute the functions of all or a part of the above-described optical pickup drive device of the present invention, and the program operates in cooperation with the computer. It may be a mouth gram.
- the present invention is a medium carrying a program for causing a computer to execute all or a part of the functions of all or part of the optical pickup driving device of the present invention described above.
- the program that is readable and may be a medium that executes the function in cooperation with the computer.
- the “partial means” of the present invention means some of the plurality of means, or some of the functions of one of the means. is there.
- a part of the device of the present invention means some of the plurality of devices, or means a part of one device, or one of the devices. It means some functions of the means.
- the present invention also includes a computer-readable recording medium that records the program of the present invention.
- One use form of the program of the present invention may be such that the program is recorded on a computer-readable recording medium and operates in cooperation with the computer.
- One use form of the program of the present invention may be a form in which the program is transmitted through a transmission medium, read by a computer, and operates in cooperation with the computer.
- the data structure of the present invention includes a database, a data format, a data table, a data list, a data type, and the like.
- the recording medium includes ROM and the like
- the transmission medium includes a transmission mechanism such as the Internet, light, radio waves, and sound waves.
- the computer of the present invention described above is not limited to pure hardware such as a CPU, but may include firmware, a computer, and peripheral devices.
- the configuration of the present invention may be realized by software or hardware. Industrial applicability
- the present invention has a remarkable effect that a focus pull-in can be performed on a deepest recording layer of a multilayer disc in a short time and reliably as a drive device of an optical pickup, a focus pull-in method of the optical pickup, or the like.
- Various devices that use optical information devices that record and reproduce multi-layer optical discs such as video players, video recorders, car AV systems, audio devices, computer storage devices, home servers, and business data backup devices
- As a large-capacity, removable, and random-access information storage device it can be used in a wide range of industrial fields, including audio, video, and computer, and its industrial applicability is very wide. And big.
Landscapes
- Optical Recording Or Reproduction (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005514489A JP4801994B2 (ja) | 2003-10-03 | 2004-09-29 | 光ピックアップの駆動装置、光ピックアップのフォーカス引き込み方法 |
EP04788448A EP1619677B1 (en) | 2003-10-03 | 2004-09-29 | Optical pickup drive device and optical pickup focus pull-in method |
US10/550,539 US7800987B2 (en) | 2003-10-03 | 2004-09-29 | Optical pickup driving apparatus and optical pickup beam spot positioning method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003345398 | 2003-10-03 | ||
JP2003-345398 | 2003-10-03 |
Publications (1)
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WO2005034112A1 true WO2005034112A1 (ja) | 2005-04-14 |
Family
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Family Applications (1)
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PCT/JP2004/014673 WO2005034112A1 (ja) | 2003-10-03 | 2004-09-29 | 光ピックアップの駆動装置、光ピックアップのフォーカス引き込み方法 |
Country Status (5)
Country | Link |
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US (1) | US7800987B2 (ja) |
EP (1) | EP1619677B1 (ja) |
JP (1) | JP4801994B2 (ja) |
CN (1) | CN100446095C (ja) |
WO (1) | WO2005034112A1 (ja) |
Families Citing this family (4)
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JP2008123570A (ja) * | 2006-11-08 | 2008-05-29 | Sony Corp | 光記録媒体駆動装置及び光記録媒体駆動方法 |
US7933182B2 (en) * | 2006-12-13 | 2011-04-26 | Canon Kabushiki Kaisha | Optical information recording and reproducing apparatus that sets a movable range of an objective lens based on the type of recording medium |
CN102105936B (zh) * | 2008-08-05 | 2015-02-04 | 三菱电机株式会社 | 车载系统 |
JP2010118093A (ja) * | 2008-11-11 | 2010-05-27 | Funai Electric Co Ltd | 光ディスク装置 |
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JPH09161284A (ja) | 1995-12-08 | 1997-06-20 | Matsushita Electric Ind Co Ltd | フォーカス引き込み方法および光ディスクドライブ装置 |
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JP2000228049A (ja) * | 1999-02-04 | 2000-08-15 | Mitsubishi Electric Corp | 光ディスク装置におけるディスク判別装置 |
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- 2004-09-29 JP JP2005514489A patent/JP4801994B2/ja not_active Expired - Lifetime
- 2004-09-29 WO PCT/JP2004/014673 patent/WO2005034112A1/ja active Application Filing
- 2004-09-29 CN CNB2004800093852A patent/CN100446095C/zh not_active Expired - Lifetime
- 2004-09-29 US US10/550,539 patent/US7800987B2/en active Active
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Also Published As
Publication number | Publication date |
---|---|
EP1619677A1 (en) | 2006-01-25 |
US20060203628A1 (en) | 2006-09-14 |
JPWO2005034112A1 (ja) | 2006-12-14 |
JP4801994B2 (ja) | 2011-10-26 |
CN1771541A (zh) | 2006-05-10 |
EP1619677B1 (en) | 2011-06-08 |
US7800987B2 (en) | 2010-09-21 |
CN100446095C (zh) | 2008-12-24 |
EP1619677A4 (en) | 2009-04-29 |
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