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WO2008035767A1 - Dispositif de lecture et d'enregistrement de dique optique - Google Patents

Dispositif de lecture et d'enregistrement de dique optique Download PDF

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Publication number
WO2008035767A1
WO2008035767A1 PCT/JP2007/068407 JP2007068407W WO2008035767A1 WO 2008035767 A1 WO2008035767 A1 WO 2008035767A1 JP 2007068407 W JP2007068407 W JP 2007068407W WO 2008035767 A1 WO2008035767 A1 WO 2008035767A1
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WO
WIPO (PCT)
Prior art keywords
optical
signal
optical disc
disc
recording
Prior art date
Application number
PCT/JP2007/068407
Other languages
English (en)
Japanese (ja)
Inventor
Naoharu Yanagawa
Masataka Izawa
Original Assignee
Pioneer Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pioneer Corporation filed Critical Pioneer Corporation
Priority to JP2008535402A priority Critical patent/JP4490501B2/ja
Publication of WO2008035767A1 publication Critical patent/WO2008035767A1/fr

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Classifications

    • 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/005—Reproducing
    • 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
    • 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

Definitions

  • the present invention relates to an optical disc discrimination technique for discriminating the type of an optical disc.
  • FIG. 1 shows a comparison table for NA (objective lens numerical aperture), substrate thickness, and light source wavelength of major optical discs.
  • Patent Document 1 Japanese Unexamined Patent Publication No. 2003-323716
  • Patent Document 2 Japanese Patent Laid-Open No. 2000-311427
  • the above-described method for measuring the substrate thickness of an optical disc to determine the type of the optical disc is an optical disc having the same base thickness, for example, DVD (Digital Versatile Disc) and HD DVD (High- There is a problem that the type of Definition Digital Versatile Disc cannot be determined.
  • the method for discriminating the type of optical disc is often used to discriminate an optical disc by applying a focus servo. If it is inappropriate for the optical disk, it is necessary to change the condition of the set optical system, set it to the condition of another optical system, and apply the focus servo again. As a result, there is a problem that the time required for disc type determination becomes longer. This will be explained using Fig. 2.
  • FIG. 2 is a flowchart showing the flow of processing for discriminating the type of disk in the prior art.
  • the optical system conditions for a predetermined type of optical disc are set, the loaded optical disc is rotated, and the light source is turned on (steps S10 and S20).
  • the actuator is driven and the objective lens is moved up and down (step S30). If there is a return light amount above a certain level from the optical disc in step S30, the focus servo is operated and the tracking servo is operated (step S40).
  • disc discrimination is performed based on the signals obtained by the focus servo operation and tracking servo operation (step S50).
  • step S50 If it is determined in step S50 that the loaded optical disc is not the optical disc of the optical system conditions that were initially set, the optical system conditions for another type of optical disc are set, and then again. Repeat steps S10 to S50. For this reason, it took time S to determine the type of optical disk. Note that if the track pitch is extremely different, the tracking servo is not turned on, so the optical system conditions for another type of optical disk may be set in step S40.
  • the present invention has been made to solve the above-mentioned problems.
  • an optical disc recording / reproducing apparatus capable of discriminating types of optical discs having the same substrate thickness is provided. There is to do.
  • An example of the problem is to provide an optical disk recording / reproducing apparatus that can quickly determine the type of an optical disk.
  • the optical disc recording / reproducing apparatus is an optical disc recording / reproducing apparatus provided with a medium discriminating unit that discriminates two or more types of optical discs, and the medium discriminating unit includes: Condition setting means for setting the conditions of one of the optical discs of the two or more types of optical discs, and rotating the mounted optical disc according to the set optical system conditions, and reproducing or playing the mounted optical disc Best to record An optical system starting means for turning on the light source for the first time; an objective lens moving means for moving the objective lens in a direction perpendicular to the disk surface of the mounted optical disk before operating the focus servo of the optical system; Based on the signal recording means for recording a predetermined signal including the RF signal received from the optical disk during the movement of the objective lens and the predetermined signal recorded by the signal recording means, the focal point is detected and detected.
  • the binarization means that digitizes the RF signal within the focal depth centered on the in-focus point and the waveform of the digitized RF signal 1S Whether or not the signal waveform of the type of optical disc for which the optical system conditions are set And binarization determining means for determining whether the mounted optical disk is! / Or a deviation between the two or more types of optical disks.
  • the optical disc recording / reproducing apparatus is an optical disc recording / reproducing apparatus provided with a medium discriminating unit for discriminating two or more types of optical discs, wherein the medium discriminating unit includes the two or more types of optical discs.
  • the condition setting means for setting the optical system conditions of the two or more types of optical discs and the set disc rotational speed conditions, Before operating the optical system starting means for rotating the mounted optical disk and simultaneously turning on the two or more light sources to reproduce or record the mounted optical disk, and operating the focus servo of the optical system An objective lens moving means for moving the objective lens in a direction perpendicular to the mounted optical disk, and the objective lens is being moved.
  • a signal recording means for recording a predetermined signal including an RF signal corresponding to each light source received from the optical disc, and based on each predetermined signal recorded by the signal recording means,
  • the binarization means that detects the focal point and digitizes each RF signal within the depth of focus around the detected focal point, and the digitized waveform of each RF signal corresponds to the optical disc of the corresponding light source.
  • binarization determining means for determining whether the mounted optical disc is one of the two or more types of optical discs based on whether or not the waveform is a signal waveform.
  • FIG. 1 A comparison table of NA, substrate thickness and light source wavelength of main optical discs.
  • FIG. 2 is a flowchart showing a flow of processing for discriminating a disc type in the prior art It is.
  • FIG. 3 is a schematic configuration diagram of the optical disc recording / reproducing apparatus according to the first embodiment of the present invention.
  • FIG. 3 is a main configuration diagram of the pickup section shown in FIG.
  • FIG. 5 is a flowchart showing medium discrimination processing of the optical disc recording / reproducing apparatus according to the first embodiment of the present invention.
  • FIG. 6 is a flowchart showing in detail a binarization process in step S500 of FIG.
  • FIG. 7 is an RF signal obtained during UP / DOWN of the objective lens in the medium discrimination process of the optical disc recording / reproducing apparatus according to the first embodiment of the present invention.
  • FIG. 8 is a diagram showing in-focus, depth of focus, and threshold values for binarization processing in the RF signal and FE signal obtained by the medium discrimination processing of the optical disc recording / reproducing apparatus according to the first embodiment of the present invention. It is.
  • FIG. 9 is a diagram showing an output waveform of an RF signal when a DVD is played with a DVD light source and when a DVD is played with an HDDVD light source.
  • FIG. 10 is a diagram showing an output waveform of an RF signal when a DVD is played with an HDDVD light source and when an HDDVD is played with a DVD light source.
  • FIG. 11 is a flowchart showing a modified example of the medium discriminating process of the optical disc recording / reproducing apparatus according to the first embodiment of the present invention.
  • FIG. 12 is a flowchart showing a process of discriminating a read-only disk and an unrecorded recording disk in the medium discriminating process of the optical disc recording / reproducing apparatus according to the first embodiment of the present invention.
  • FIG. 13 is a flowchart showing medium discrimination processing of the optical disc recording / reproducing apparatus according to the second embodiment of the present invention.
  • FIG. 17 is an example of a main configuration of a pickup unit of an optical disc recording / reproducing apparatus according to a second embodiment of the present invention.
  • FIG. 18 is a flowchart showing a modification of the medium discrimination process of the optical disc recording / reproducing apparatus according to the second embodiment of the present invention.
  • optical discs DVD, HDDVD, CD, BD
  • FIG. 3 is a diagram showing a schematic configuration of the optical disc recording / reproducing apparatus 1 according to the first embodiment of the present invention.
  • the optical disc recording / reproducing apparatus 1 shown in FIG. 3 is an optical disc recording / reproducing apparatus capable of recording / reproducing two types of optical discs 2 having the same substrate thickness. It has a function to determine the type (medium) of disk 2.
  • the optical disc 2 having the same substrate thickness in the present embodiment is a power that can be described by taking DVD (Digital Versatile Disc) and HDDVD (High-Definition Digital Versatile Disc) as examples. Any optical disc with the same substrate thickness (distance from the disc surface to the recording surface) can be used!
  • the pickup unit 3 of the optical disc reproducing apparatus 1 is an optical pickup that reads a signal recorded on the optical disc 2, irradiates the optical disc 2 with laser light, and converts the reflected light into an electric signal. Are output to the signal processor 4.
  • the signal processing unit 4 performs waveform shaping processing, noise removal processing, digital conversion processing, and the like on the electrical signal, and outputs a reproduction signal (RF signal) to a reproduction circuit (not shown) or the like. Further, the signal processing unit 12 generates a servo error signal (focus error (FE) signal, tracking error (TE) signal) from the above-described electrical signal and outputs the servo error signal to the control unit 5.
  • a servo error signal focus error (FE) signal, tracking error (TE) signal
  • the control unit 5 performs movement control of the pickup unit 3, generates a servo error signal force, a drive signal for focus control and tracking control, and outputs the drive signal to the drive unit 6. It has become.
  • the control unit 5 performs medium discrimination processing (details will be described later) for discriminating the type of the optical disc 2 when reproducing the mounted optical disc 2.
  • the drive unit 6 drives an actuator (not shown) in the pickup unit 3 based on the drive signal, and the pickup unit 3 (shown in the pickup! //! // objective lens) Is moved in a direction perpendicular to the disk surface of the optical disk 2, and the entire pickup unit 3 is moved in the radial direction of the optical disk 2.
  • the optical system switching unit 7 performs optical system switching control according to the type of the optical disk.
  • the optical system conditions (light source, Aberration correction means, disk rotational speed, etc.) are set.
  • FIG. 4 is a diagram showing a main configuration of the pickup unit 3.
  • the pickup unit 3 includes a DVD module 31 having a DVD light source (LD) and a photodetector (PD), and a HDDVD light source (LD) and a photodetector (PD).
  • Laser light (wavelength: 650 nm) emitted from the light source of the DVD module 31 is converted into parallel light by the collimator lens 33, reflected by the PBS 35, and incident on the objective lens 36 to become a light beam. It is condensed on the recording surface. Further, the reflected light generated by irradiating the recording surface of the optical disc 2 with the light beam passes through the objective lens 36, is reflected by the PBS 35, and enters the photodetector of the DVD module 31 through the collimator lens 33.
  • laser light (wavelength: 405 nm) emitted from the light source of the HDDVD module 32 is converted into parallel light by the collimator lens 34, transmitted through the PBS 35, and incident on the objective lens 36 to become a light beam.
  • the light is condensed on the recording surface of the optical disc 2.
  • the reflected light generated by irradiating the recording surface of the optical disc 2 with the light beam passes through the objective lens 36 and the PBS 35 and enters the photodetector of the HDDVD module 32 through the collimator lens 34.
  • the optical system switching unit 7 sets the optical system condition of either the DVD or the HDDVD selected by the control unit 5, so that the DVD module 31 or the HDDVD module 32! / The misalignment is working! /
  • FIG. 5 is a flowchart showing the medium discrimination process of the optical disc recording / reproducing apparatus 1
  • FIG. 6 is a flowchart showing in detail step S500 of FIG.
  • the optical disc recording / reproducing apparatus 1 sets conditions relating to the optical system of either DVD or HDDVD (step S100). Specifically, the settings are related to the light source, objective lens aberration correction, disc rotation speed, etc. For example, when DVD is selected, the aberration is adjusted to the DVD light source (650 nm) and DVD ⁇ (0 ⁇ 6). Correction, DVD disc rotation speed (3. 49m / sec), etc. are set, and when HDDVD is selected, HDDVD light source (405nm), aberration correction matched to HDDVD) (0 ⁇ 65), HDDVD disc The rotation speed ( 6.61m / SeC ) is set.
  • the type of optical disc (DVD or HDDVD) for which the optical system conditions are set first is called the first disc. How to set up the first disk For example, the type of the optical disk 2 loaded last time may be set, or may be set by the user's selection, or may be set based on the past playback history. ! / (Set the type of optical disc 2).
  • the optical disc recording / reproducing apparatus 1 rotates the mounted optical disc 2 according to the set disc rotation speed, and the light source of the first disc (light source of either the DVD module 31 or the HDDVD module 32) Is lit (steps S200 and S300).
  • the optical disc recording / reproducing apparatus 1 moves, that is, moves up and down, the objective lens 36 in a direction perpendicular to the disc surface of the optical disc 2 (a direction approaching the disc surface and a direction away from the disc surface) (see FIG. Step S400). Then, during the vertical movement of the objective lens 36, the RF signal received from the optical disc 2 is binarized based on a predetermined threshold (step S500).
  • the binarization process in step S500 will be described in detail with reference to FIG.
  • the objective lens 36 is first moved from the initial position in a direction approaching the disk surface (upward) and then moved away from the disk surface (downward). This will be described below.
  • step S510 First, in the process of raising the objective lens 36! / When the RF signal exceeds a certain level, the RF signal is input to the memory and the RF signal is recorded (step S510). ).
  • Figure 7 (a) shows an example of the RF signal waveform input to the memory.
  • FIG. 7 (b) is an enlarged view of the nearby waveform including the maximum value of the RF signal shown in FIG. 7 (a).
  • step S510 when the RF signal exceeds a certain level, the RF signal is input to the memory, but in addition to the RF signal, the FE signal may also be input to the memory! /.
  • the RF signal output maximum position position of RF return light amount MAX
  • the position where the output of the FE signal is zero is the in-focus position (P1 ) May be detected.
  • a threshold L1 for binarizing the RF signal is determined (step S530). Specifically, the threshold value L1 is a value obtained by subtracting half of the RF amplitude value at the position P1 from the maximum output value of the RF signal. Next, the depth of focus of the first disk is calculated (step S540).
  • the RF signal within the focal depth ⁇ Z is binarized based on the threshold L1 with the focus position (P1) as the center (Ste S550).
  • the mounted optical disc 2 is the first disc in which the optical system conditions are set, in the region within the focal depth ⁇ Z centered on the position of the focal point (P 1), the desired optical disc 2 Based on the ability to play back the RF waveform (RF waveform of the first disc).
  • the position of the objective lens 36 is detected by an objective lens position sensor (not shown)! /
  • the position detection method is disclosed in, for example, Japanese Patent Laid-Open No. 5-114150 and Japanese Patent Laid-Open No. 11), the optical disk recording / reproducing apparatus 1 confirms that the objective lens 36 is located within the focal depth ⁇ Z centered on the position of the in-focus point (P1). Can figure out
  • the optical disc recording / reproducing apparatus 1 determines whether or not the binarized RF signal has a desired RF waveform (RF waveform of the first disc) (step 1). S600).
  • binarization is possible when the binarized RF signal has a desired RF waveform.
  • the desired RF waveform means that when the first disc is a DVD, the pulse width of the binarized RF waveform (digital signal) corresponds to 3T to 14T. Therefore, when the first disc is a DVD and the DVD optical system conditions are set, when a digital signal corresponding to a digital signal width of 3T to 14T is obtained, the loaded optical disc 2 can be determined to be a DVD.
  • the nore width of the digital signal is not the pulse width, it can be determined that the mounted optical disc 2 is not a DVD, that is, an HDDVD.
  • binarization determination circuit for example, Morio Onoe, Noboru Murayama et al., “Optical Disc Technology”, Radio Inc. Technology, P. 190-193.
  • the RF signal DC component
  • AC component the RF signal
  • step S600 when binarization is possible (when the binarized RF signal has a desired RF waveform), it is determined that the mounted optical disc 2 is the first disc, With the optical system conditions for the first disk set, turn on the focus servo and tracking servo (step S1000).
  • step S600 when binarization is not possible (when the binarized RF signal is not a desired RF waveform), the mounted optical disc 2 is not the first disc, The disc is determined to be the second disc, and the optical system conditions for the second disc are set (step S700).
  • the optical disc recording / reproducing apparatus 1 rotates the mounted optical disc 2 according to the disc rotation speed of the second disc, turns on the light source of the second disc (steps S800, S900), and performs focus servo. Then, turn on the tracking servo (step S1000).
  • the binarization processing shown in FIG. 6 is a force that assumes a flow assuming that the output of the RF signal (RF amplitude) is equal to or higher than a predetermined level. For example, the off-pit is sufficiently irradiated with a light beam. If an RF signal output cannot be obtained, the objective lens 36 is moved up and down again and the above steps S510 to S550 may be executed.
  • step S1000 when processing for binary straight half IJ determination in steps S400 to S600 is performed between steps S900 and S1000, and if binarization can be determined, the process proceeds to step S1000. If binarization is impossible, a display may be made indicating that the optical disk is unknown, and the loaded optical disk 2 may be ejected. This is to support the standardization of new optical discs with the same substrate thickness other than DVD and HDDVD. That is, in this case, it can be applied to discriminating three or more types of optical disks having the same substrate thickness.
  • FIG. 9 and FIG. 10 are diagrams showing output waveforms of RF signals in the above four cases.
  • Fig. 9 (a ) Shows an RF signal when a DVD is played back with a DVD light source, and the binarized digital signal has a desired waveform (pulse width 3T to 14T).
  • Fig. 9 (b) shows the RF signal when a DVD is played back with an HDDVD light source.
  • the HDDVD light beam has a smaller beam diameter than that of the DVD, so it is not at the edge of the pit. Power and RF signal cannot be obtained.
  • the binarized digital signal does not have the desired waveform (for example, the pulse width is 1T, 1.5 ⁇ , etc.).
  • Fig. 10 (a) shows an RF signal when HDDVD is played back with an HDDVD light source, and the binarized digital signal has a desired waveform.
  • Fig. 10 (b) shows the RF signal when HDDVD is played back with a DVD light source. Since the DVD optical beam has a larger beam diameter than HDDVD, only the long pit part has an RF signal. (Short pit part cannot get RF signal) and RF amplitude is small, so binarization is impossible (no binarization waveform as shown).
  • the objective lens 36 is moved up and down before the force control and the tracking control are performed, and the obtained value is obtained during the up-and-down movement. Since the focal point (P1) is detected based on the RF signal or FE signal, the RF signal within the focal depth ⁇ centered on the position of the focal point (P1) is binarized, and the type of optical disc 2 is discriminated. Even with optical disks having the same substrate thickness, such as DVD and HDDVD, the type of optical disk can be quickly determined.
  • the light sources of the two types of optical disks are sequentially turned on (when the first disk cannot be binarized) to determine the medium.
  • the medium discrimination process may be performed by turning on the light sources of two types of optical disks at the same time.
  • FIG. 11 is a flowchart showing medium discrimination processing when the light sources of two types of optical disks are turned on simultaneously.
  • Step S1100 the conditions concerning the optical system of both DVD and HDDVD are set.
  • one of the types of optical disks set at the same time one of DVD and HDDVD
  • the other is called the second disk (the other of DVD and HDDVD).
  • both conditions cannot be set for the rotational speed of the disk, for example, the rotational speed for the first disk is set.
  • the optical disk recording / reproducing apparatus 1 rotates the mounted optical disk 2 in accordance with the disk rotation speed of the first disk, and simultaneously turns both the light source of the first disk and the light source of the second disk. Lights up (steps S1200, S1300).
  • the optical disk recording / reproducing apparatus 1 moves, that is, moves up and down, the objective lens 36 in a direction perpendicular to the disk surface of the optical disk 2 (a direction approaching the disk surface and a direction moving away from the disk surface) (see FIG. Step S 1400). Then, during the vertical movement of the objective lens 36, the RF signal received from the optical disc 2 is binarized based on a predetermined threshold (step S1500). In this modification, since the two light sources are turned on at the same time, both the RF signal for the first disc and the RF signal for the second disc (in both the photodetectors of the DVD module 31 and the HDDVD module 32). The detected RF signal) will be binarized.
  • the binarization process in step S 1500 is the same as the binarization process flow in FIG. However, regarding the binarization processing of the second disk, the disk rotation speed is set to the rotation speed of the first disk, so the rotation speed of the first disk is a and the rotation speed of the second disk.
  • the optical disc recording / reproducing apparatus 1 determines whether or not the binarized RF signal has a desired RF waveform (step S 1600). That is, whether or not the binarized RF signal of the first disk has a desired RF waveform, and whether or not the binarized RF signal of the second disk has a desired RF waveform Determine whether or not. Since the loaded optical disk 2 is either the first disk or the second disk! /, The deviation is V, and one of the RF signals is the desired RF waveform, and V, the deviation is the other disk. The RF signal must have the desired RF waveform! /.
  • an optical disk that cannot be binarized is mounted. It is determined that the optical disk 2 has not been turned off, and the light source is turned off (step S 1700).
  • the rotation speed of the first disk (actual rotation speed) in which the rotation speed of the optical disk is set in step S1100. It is determined whether or not it is the same as the rotation speed of the spindle being operated (step S1 800). If the rotation speed of the binarizable optical disk is the same as the rotation speed of the first disk, it can be determined that the loaded optical disk 2 is the first disk, so the spindle rotation speed is set to the first rotation speed. With the disc rotation speed set, turn on the focus servo and tracking servo (step S2000).
  • the loaded optical disk 2 is Since it can be determined that it is a disk, set the rotation speed of the spindle to the rotation speed of the second disk, and turn on the focus servo and tracking servo (steps S1900, S2000).
  • the same medium determination processing as in the first embodiment can be performed even when the light sources of two types of optical disks are simultaneously turned on, so the first embodiment As described above, it is possible to quickly determine the type of an optical disk even for optical disks having the same substrate thickness, for example, DVD and HDDVD.
  • the reproduction-only optical disk (DVD-ROM, HDD VD-ROM) has been described as an optical disk to be discriminated S, the present invention is not limited to this, and the recording optical disk (DVD-R, DVD-RW, HDDVD-R, HDDVD-RW, etc.) may be added to the disc to be discriminated.
  • the recording optical disk (DVD-R, DVD-RW, HDDVD-R, HDDVD-RW, etc.) may be added to the disc to be discriminated.
  • FIG. 12 is a flowchart showing the reproduction “unrecorded recordable disc discrimination process.
  • the reproduction“ record discrimination discriminating process is a process positioned as a step before step S510 in the binarization process of FIG.
  • the optical disc playback apparatus 1 determines whether or not an RF signal is input while the objective lens 36 is moving up or down (step S501).
  • the pickup unit 3 is assumed to be positioned in the data area of the optical disc 2 as the initial position in the radial direction.
  • the optical disk is determined to be a reproduction-only optical disk (step S502), and thereafter, the process proceeds to step S510.
  • the pickup unit 3 is positioned at the innermost peripheral part inside the data area of the optical disc 2, and the objective lens is located at the position. It is determined whether or not an RF signal is input while 36 is rising or falling (steps S503 and S504). This is based on the fact that both the DVD and HDDVD recording optical discs are unrecorded discs, and RF signals are recorded on the innermost circumference of the optical disc.
  • the pickup unit 3 is positioned at the innermost periphery, the RF signal is detected by gradually changing the radial position of V in the innermost periphery.
  • the optical disc 2 is determined to be a recording optical disc (step S505), and the process proceeds to step S510. move on. If no RF signal is input at the innermost periphery, the process ends as an unknown optical disk (displayed as Unknown Disc and ejects the loaded optical disk 2).
  • a recorded recording disc it may be determined as a read-only disc.
  • Recorded recording discs have the same physical standard as playback-only discs and are compatible with each other.
  • the present modification it is possible to determine whether the read-only optical disk is an unrecorded recording optical disk by using only an RF signal without providing a new detection circuit.
  • optical disks having the same substrate thickness it is possible to discriminate between read-only optical disks and unrecorded recording optical disks.
  • An optical disk recording / reproducing apparatus 10 is an optical disk recording / reproducing apparatus capable of reproducing four types of optical disks 2 including two types of optical disks 2 having the same substrate thickness. A function for discriminating the type (medium) of the optical disc 2 is provided.
  • DVD Digital Versatile Disc
  • HDDVD High-Definition Digital Versatile Disc
  • any optical disk having the same substrate thickness may be used.
  • optical disks 2 include force S, which is exemplified by CD (Compact Disc) and BD (Blu-ray Disc), and two types of optical disks with the same substrate thickness. May be acceptable if the optical discs have different substrate thicknesses.
  • the configuration of the optical disc recording / reproducing apparatus 10 is substantially the same as that of the optical disc recording / reproducing apparatus 1 except for the configuration of the pickup unit (substantially the same as FIG. 3), and thus the description thereof is omitted.
  • the configuration of the main part of the pickup section which will be described later.
  • FIG. 13 is a flowchart showing medium discrimination processing of the optical disc recording / reproducing apparatus 10.
  • any one light source selected from the light sources of the four types of optical discs is turned on to perform the medium discrimination process.
  • the optical disc recording / reproducing apparatus 10 rotates the mounted optical disc 2 and turns on the light source on the basis of the set conditions relating to the optical system of a predetermined type of optical disc.
  • To measure the substrate thickness of the mounted optical disk 2 (step S2100).
  • the method for measuring the disk substrate thickness is based on a known predetermined method.
  • the optical disc recording / reproducing apparatus 10 determines whether the measured substrate thickness of the optical disc 2 is a BD substrate thickness (0.1 mm, 0.075 mm) or a CD substrate thickness (1.2 mm). Or a substrate thickness (0 ⁇ 6 mm) of a DVD type (DVD and HDDVD! /, U) (step S 2 200).
  • the type of the mounted optical disc 2 is BD, so that the optical disc recording / reproducing apparatus 10 is a BD optical system.
  • the optical disk 2 is rotated at the BD rotation speed, the BD light source is turned on, and then the focus servo and tracking servo are turned ON (steps S2300 to S2500, S2900).
  • the type of the mounted optical disk 2 is a CD.
  • the system-related conditions are set, the optical disk 2 is rotated at the number of rotations of the CD according to the set conditions, the CD light source is turned on, and then the focus servo and tracking servo are turned on (steps S2600 to S2900).
  • step S3000 When it is determined that the measured substrate thickness of the optical disc 2 is a DVD type substrate thickness, the optical disc recording / reproducing apparatus 10 performs a DVD / HDDVD determination process (step S3000).
  • the DVD / HDDVD determination process in step S3000 is the same as the medium determination process (steps S100 to S1000) in FIG.
  • step S3000 it is determined whether the mounted optical disk 2 is a DVD or HDDVD! /, So set the conditions related to the optical system of the determined optical disk, then focus servo and tracking. Turn on the servo.
  • the substrate thickness of the optical disc is measured and the medium discrimination process described in the first embodiment is applied to discriminate the type of the optical disc, so that the substrate thickness is the same. It is possible to quickly determine the type of four types of optical discs, including the two types of optical discs.
  • the disk substrate thickness measurement process (step S2100) and the binarization determination process (part of step S3000) are moved up and down with the force obtained in separate steps.
  • the disk substrate thickness may be measured and the binarization determination process may be performed in the same step.
  • the force S is used to discriminate between BD, DVD, HDDVD, and CD.
  • FIGS. 14 to 17 show examples of various configurations of the pickup unit of the optical disc recording / reproducing apparatus 10 according to the present embodiment.
  • the pickup unit 3A shown in FIG. 14 is a type that includes two objective lenses 36 and switches the objective lens 36 according to the light source. That is, since the objective lens 36A1 is an objective lens for HDDVD / DV D / CD and the objective lens 36A2 is an objective lens for BD, when turning on the light source for HDDVD / DVD / CD, the objective lens Switch to 36A1, When the light source for BD is turned on, it is switched to the objective lens 36A2. Note that the wavelength transmission filter 37A ;! to 3 can transmit only the laser beam having a wavelength corresponding to each light source, and the cross stroke can be removed when the light sources are simultaneously turned on.
  • the collimator lens 33A3 is movable in the direction of the arrow, and can correct spherical aberration based on the difference in the substrate thickness of the optical disk (the collimating lens of the DVD can also be moved in the optical axis direction to Is also effective.)
  • the pickup unit 3B shown in FIG. 15 is a type that switches the optical path according to the light source. Specifically, laser light is emitted from the same BD / HDDVD module 31B3, and the optical path of BD and HD DVD is switched.
  • objective lens 36B1 for HDDVD / DVD / CD in the case of BD
  • the BD objective lens 36B2 is transmitted therethrough.
  • the optical path switching between BD and HDDVD is performed by the optical path switching polarizing element 38B for HDDVD / BD.
  • the collimator lens 33B3 is movable in the direction of the arrow, and can correct spherical aberration based on the difference in the substrate thickness of the optical disk.
  • the pickup unit 3C shown in FIG. 16 includes a CD / DVD / BD / HDDVD compatible laser module 31C including a light source capable of emitting laser light of three wavelengths and a light detection unit capable of detecting laser light of three wavelengths. And two objective lenses 36C. That is, the objective lens 36C1 is an objective lens for HDDVD / DVD / CD, and the objective lens 36C2 is an objective lens for BD, so when turning on the light source for HDDVD / DVD / CD, When switching to the objective lens 36C1 and turning on the light source for BD, the objective lens 36C2 is switched.
  • the collimator lens 33C is movable in the direction of the arrow, and can correct spherical aberration based on the difference in the substrate thickness of the optical disk.
  • a pickup unit 3D shown in FIG. 17 includes a CD / DVD / BD / HDDVD compatible laser module 31D including a light source capable of emitting laser light of three wavelengths and a light detection unit capable of detecting laser light of three wavelengths. And one objective lens 36D. That is, there is no need to switch the objective lens regardless of which light source is used.
  • the collimator lens 33D is movable in the direction of the arrow, and can correct spherical aberration based on the difference in the substrate thickness of the optical disk.
  • FIG. 18 is a flowchart showing the medium discrimination process when the light sources of the four types of optical disks are turned on simultaneously.
  • the optical disk recording / reproducing apparatus 10 of this modification will be described below assuming that it includes a pickup unit 3D having the configuration shown in FIG.
  • the optical disc recording / reproducing apparatus 10 sets conditions relating to the optical systems of all types of optical discs in order to simultaneously turn on all the light sources of the four types of optical discs (step S3100). Regarding the rotational speed of the optical disc, the conditions for any type of optical disc (referred to as the first disc) are set.
  • the optical disk recording / reproducing apparatus 1 rotates the mounted optical disk 2 according to the disk rotation speed of the first disk, and turns on all the light sources (steps S3200, S3300).
  • the optical disk recording / reproducing apparatus 1 moves, that is, moves up and down, the objective lens 36 in a direction perpendicular to the disk surface of the optical disk 2 (a direction approaching the disk surface and a direction moving away from the disk surface) (Ste S3400). Then, during the vertical movement of the objective lens 36, the substrate thickness of the mounted optical disk 2 is measured, and the RF signal received from the optical disk 2 is binarized based on a predetermined threshold (step S3500).
  • the method of measuring the disk substrate thickness is based on a known method.
  • the binarization of the RF signal is performed only for the RF signal received by the DVD module and HDDVD module. This binarization process is the same as the binarization process flow of FIG.
  • step S1500 in FIG. 11 it is necessary to change the binarization detection clock of the binarization determination circuit in accordance with the set disk rotation speed. There is.
  • the optical disc recording / reproducing apparatus 10 determines whether the measured substrate thickness of the optical disc 2 is the BD substrate thickness (0.1 mm, 0.075 mm) or the CD substrate thickness (1.2 mm). Or DVD tie It is determined whether the thickness of the substrate (DVD and HDDVD! /) Is (0.6 mm) (step S3 600).
  • the type of the mounted optical disc 2 is BD, so that the optical disc recording / reproducing apparatus 10 uses the BD optical system.
  • the optical disk 2 is rotated at the BD rotation speed, the light sources other than the BD are turned off, and the focus servo and tracking servo are turned on (steps S3700 to S3900, S4600).
  • the type of the mounted optical disk 2 is a CD.
  • the system-related conditions are set, the optical disk 2 is rotated at the number of rotations of the CD according to the set conditions, the light sources other than the CD are turned off, and the focus servo and tracking servo are turned on (steps S4000 to S4200, S4600).
  • the optical disc recording / reproducing apparatus 10 performs a DVD / HDDVD determination process (step S4300).
  • This DVD / HDDVD determination process is based on whether or not each of the binarized RF signals in step S3500 has a desired RF waveform.
  • the DVD module receives light from the DVD module. If the RF signal shows a DVD waveform, the mounted optical disk 2 is judged as a DVD, and if the RF signal received by the HDDVD module shows a HDD VD waveform, it is judged as an HDDVD.
  • the optical system conditions of the determined optical disk are set, the optical disk 2 is rotated at a desired number of rotations according to the set conditions, the light sources other than the determined optical disk are turned off, and the focus servo and Turn on the tracking servo (steps S4400 to S4600).
  • the medium determination process of the optical disc recording / reproducing apparatus 10 including the pickup unit 3D having the configuration illustrated in FIG. 17 has been described.
  • the optical disc recording including the pickup unit having other configurations is described.
  • the playback device 10 may be used.
  • both the RF signals received by both the DVD module and the HDDVD module may not be binarized. In this case, it is necessary to switch the objective lens 36 or the optical path. It becomes important. For example, in the case of the pickup unit 3A shown in FIG. 14, when the BD objective lens 36A2 is set, both cannot be binarized in the DVD and HDDVD determination processing.
  • the light source of the four types of optical disks is turned on simultaneously to measure the substrate thickness of the optical disk, and the medium discrimination described in the first modification of the first embodiment is performed. Since the type of the optical disc is discriminated by applying the processing, it is possible to quickly discriminate the types of four types of optical discs including two types of optical discs having the same substrate thickness.
  • the power used to binarize the RF signal within the focal depth and discriminate the type of the optical disc may be determined by measuring the position (range) where the RF signal exists. Specifically, for example, when HDDVD is played back with a DVD optical system, sufficient RF output cannot be obtained even within the focal depth. However, when a DVD is played back with a DVD optical system, it is shown in Fig. 7. Can be obtained (an RF signal having substantially the same amplitude within the depth of focus, and an RF signal whose output gradually decreases as the depth of focus is exceeded). Based on the appearing position, the type of the optical disk can be determined.
  • an RF signal with the same magnitude as the depth of focus can be obtained even if the depth of focus is exceeded ( Figure 9 (b) within the depth of focus.
  • Figure 9 (b) within the depth of focus.
  • an RF signal with a short waveform width is obtained, and an RF signal with a long waveform width is obtained outside the depth of focus).
  • the type of optical disc can be discriminated based on the position and magnitude of the RF signal. I'll do it.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)

Abstract

L'invention concerne un dispositif de lecture et d'enregistrement de disque optique (1) déterminant une condition sur un système optique, soit DVD soit HDDVD, et allumant une source de lumière du disque en fonction de la condition optique établie. Puis, pendant le déplacement d'une lentille de focalisation (36) dans le sens vertical par rapport à la surface d'un disque optique monté (2), un signal RF de lumière reçue du disque optique (2) est binarisé en fonction d'une valeur seuil prédéterminée (un signal RF dans une profondeur de focalisation définie au niveau du point focal comme étant le centre est binarisé par une valeur seuil prédéterminée). Le dispositif évalue si le signal RF binarisé est une forme d'onde RF souhaitée ou non (une forme d'onde RF du disque à condition optique établie). Si le signal RF binarisé est la forme d'onde souhaité, le dispositif estime que le disque monté (2) est bien le disque à condition optique établie. À l'inverse, si le signal RF binarisé n'est pas la forme d'onde souhaitée, le dispositif estime que le disque optique monté (2) est le deuxième disque.
PCT/JP2007/068407 2006-09-21 2007-09-21 Dispositif de lecture et d'enregistrement de dique optique WO2008035767A1 (fr)

Priority Applications (1)

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JP2008535402A JP4490501B2 (ja) 2006-09-21 2007-09-21 光ディスク記録再生装置

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JP2006-255486 2006-09-21
JP2006255486 2006-09-21

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015053091A (ja) * 2013-09-05 2015-03-19 三菱電機株式会社 光ディスク装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002183979A (ja) * 1996-02-08 2002-06-28 Victor Co Of Japan Ltd 光記録媒体種類判別装置
JP2002288826A (ja) * 2002-01-28 2002-10-04 Sony Corp 光ディスク判別方法
JP2002304748A (ja) * 2001-04-05 2002-10-18 Pioneer Electronic Corp 光ディスク再生装置及び光ディスク判別方法
JP2004206765A (ja) * 2002-12-24 2004-07-22 Teac Corp 光ディスク装置
JP2005259252A (ja) * 2004-03-11 2005-09-22 Sony Corp ディスクドライブ装置、ディスク判別方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002183979A (ja) * 1996-02-08 2002-06-28 Victor Co Of Japan Ltd 光記録媒体種類判別装置
JP2002304748A (ja) * 2001-04-05 2002-10-18 Pioneer Electronic Corp 光ディスク再生装置及び光ディスク判別方法
JP2002288826A (ja) * 2002-01-28 2002-10-04 Sony Corp 光ディスク判別方法
JP2004206765A (ja) * 2002-12-24 2004-07-22 Teac Corp 光ディスク装置
JP2005259252A (ja) * 2004-03-11 2005-09-22 Sony Corp ディスクドライブ装置、ディスク判別方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015053091A (ja) * 2013-09-05 2015-03-19 三菱電機株式会社 光ディスク装置

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