WO2010146627A1 - Dispositif de reproduction de disque optique - Google Patents

Dispositif de reproduction de disque optique Download PDF

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Publication number
WO2010146627A1
WO2010146627A1 PCT/JP2009/002737 JP2009002737W WO2010146627A1 WO 2010146627 A1 WO2010146627 A1 WO 2010146627A1 JP 2009002737 W JP2009002737 W JP 2009002737W WO 2010146627 A1 WO2010146627 A1 WO 2010146627A1
Authority
WO
WIPO (PCT)
Prior art keywords
spherical aberration
collimator lens
optical disk
aberration correction
reference position
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2009/002737
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English (en)
Japanese (ja)
Inventor
北田晃
星野洋史
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to PCT/JP2009/002737 priority Critical patent/WO2010146627A1/fr
Publication of WO2010146627A1 publication Critical patent/WO2010146627A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1372—Lenses
    • G11B7/1376—Collimator lenses
    • 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
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1392—Means for controlling the beam wavefront, e.g. for correction of aberration
    • G11B7/13925—Means for controlling the beam wavefront, e.g. for correction of aberration active, e.g. controlled by electrical or mechanical means
    • 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 disk reproducing apparatus that performs spherical aberration correction by moving a spherical aberration correcting collimator lens built in an optical pickup when reproducing an optical disk, for example.
  • an optical pickup used for reproducing a BD incorporates a mechanism for correcting spherical aberration generated by the BD. This is because the use of a high NA (Numerical Aperture) objective lens and a short-wavelength laser for reproducing BD affects the influence of spherical aberration caused by variations in the cover thickness up to the BD recording layer on the BD reproduction signal. This is because it cannot be ignored.
  • NA Numerical Aperture
  • an optical disk reproducing apparatus that corrects spherical aberration generated when reproducing this BD
  • an optical disk reproducing apparatus that mechanically moves the position of a collimator lens for correcting spherical aberration incorporated in an optical pickup (for example, Patent Document 1). reference).
  • the optical disk reproducing device disclosed in Patent Document 1 mechanically moves a spherical aberration correction collimator lens built in an optical pickup and adjusts a spherical aberration correction amount generated by the spherical aberration correction collimator lens. Therefore, the spherical aberration caused by the variation in the cover thickness of the BD is canceled out.
  • a stepping motor is generally used as a driving means for accurately controlling the position of the spherical aberration correcting collimator lens.
  • the spherical aberration correcting collimator lens having the stepping motor first, the reference position of the spherical aberration correcting collimator lens is detected, and the spherical aberration correcting collimator lens is moved by a desired number of steps from the reference position by the stepping motor. Spherical aberration correction is performed.
  • this stepping motor a small low-torque motor with a diameter of about 3 mm is used in order to fit in a limited space in the optical pickup.
  • an optical disc playback apparatus that plays back a BD is usually capable of playing back DVD (Digital Versatile Disk) and CD (Compact Disc).
  • DVD Digital Versatile Disk
  • CD Compact Disc
  • the position of the spherical aberration correcting collimator lens optimum for reproduction differs for each medium of BD / DVD / CD, and for each layer in the case of a multilayer medium.
  • the optimal spherical aberration correcting collimator lens position of each medium has a positional relationship from the reference position to the reference position ⁇ BD-L1 layer ⁇ CD ⁇ DVD ⁇ BD-L0 layer.
  • the spherical aberration correcting collimator lens does not move to a position far from the appropriate position of the spherical aberration correcting collimator lens with respect to the CD. For this reason, dust or the like adheres to the shaft in a range where the collimator lens for correcting spherical aberration does not move, and corrosion occurs.
  • the spherical aberration correcting collimator lens needs to move on the shaft where dust adheres and corrodes.
  • the stepping motor that moves the collimator lens for correcting spherical aberration is a small low torque motor, there is a high risk that it will not be able to move even under a light load such as dust or corrosion adhering to the shaft.
  • the BD cannot be reproduced without reaching the proper position of the collimator lens for aberration correction.
  • the present invention has been made to solve the above-described problems.
  • the spherical aberration correction collimator lens continues to be used in a limited range.
  • Another object of the present invention is to provide an optical disk reproducing apparatus capable of suppressing an increase in the movement load of the spherical aberration correcting collimator lens due to dust or corrosion generated on the shaft.
  • the optical disk reproducing apparatus is an optical disk reproducing apparatus that corrects spherical aberration by moving the spherical aberration correcting collimator lens to an appropriate position for all reproducible media, and determines the reference position of the spherical aberration correcting collimator lens.
  • the optical disk reproducing apparatus can be used even in a situation where the daily-used media is biased and the spherical aberration correcting collimator lens continues to be used in a limited range of movement.
  • the spherical aberration correction collimator lens By providing an opportunity to move the spherical aberration correction collimator lens beyond the movable range for all media that can be played back, it is possible to remove dust and corrosion adhering to the shaft and increase the movement load of the spherical aberration correction collimator lens. Therefore, it is possible to reliably reproduce the BD.
  • FIG. 1 is a block diagram showing a configuration of an optical disc device according to Embodiment 1 of the present invention. It is a figure which shows the structure of the optical pick-up in Embodiment 1 of this invention. It is a figure which shows the cross-section of the optical disk in Embodiment 1 of this invention. It is a figure which shows the structure of the spherical aberration correction drive mechanism in Embodiment 1 of this invention. It is a figure which shows the movable range of the collimator lens for spherical aberration correction in Embodiment 1 of this invention, and the appropriate position with respect to each medium.
  • FIG. 1 is a block diagram showing a configuration of an optical disk reproducing apparatus according to Embodiment 1 of the present invention.
  • the optical disk reproducing apparatus according to Embodiment 1 of the present invention is configured to be compatible with each of BD (Blu-ray Disc), DVD (Digital Versatile Disc), and CD (Compact Disc) as the optical disk shown in FIG. Is.
  • BD Blu-ray Disc
  • DVD Digital Versatile Disc
  • CD Compact Disc
  • the optical disk reproducing apparatus includes an optical pickup 1 that reads information recorded on an optical disk, and a matrix that generates a reproduction data signal for reproducing video and audio from the information read by the optical pickup 1.
  • a circuit 2 ; a data signal processing circuit 3 for detecting a binary data string from the reproduction data signal generated by the matrix circuit 2; and a decoding for demodulating the reproduction data from the binary data string detected by the data signal processing circuit 3 Unit 4, a system controller 5 for controlling various operations of the optical disk reproducing apparatus, a spindle driver 7 for driving a spindle motor 6 for rotating the optical disk loaded on the turntable, and a spindle servo circuit 8 for controlling the spindle driver 7.
  • a thread driver 10 that drives the thread 9 to be moved, a servo circuit 12 that controls the spherical aberration correction driver 11 that causes the optical pickup 1 to perform spherical aberration correction, a laser driver 13 that causes the optical pickup 1 to emit laser light, It comprises a host device 100 constituted by a computer device or AV (Audio-Visual) system device, etc., and a host interface (I / F) 14 for connecting the optical disk reproducing device.
  • a host device 100 constituted by a computer device or AV (Audio-Visual) system device, etc.
  • I / F host interface
  • the system controller 5 controls the spindle servo circuit 8, the servo circuit 12, and the laser driver 13 in accordance with an instruction for requesting transfer of reproduction data recorded on the optical disc sent from the host device 100 via the host I / F 14. To do.
  • the servo circuit 12 generates a thread driver signal based on the control by the system controller 5, and drives the thread 9 by the thread driver 10 in accordance with the thread driver signal, so that the optical pickup 1 is placed on the optical disk. Slide it to the required position.
  • the spindle servo circuit 8 generates a spindle driver signal based on the control by the system controller 5, and rotates the optical disc by driving the spindle motor 6 by the spindle driver 7 in accordance with the spindle driver signal.
  • the optical pickup 1 reads out information recorded as pits or marks on a track on the optical disc by irradiating the optical disc with the laser beam by the laser driver 13. Information read from the optical disk by the optical pickup 1 is sent to the matrix circuit 2 as an electrical signal.
  • the matrix circuit 2 generates a reproduction data signal for reproducing video and audio from the electrical signal sent from the optical pickup 1.
  • the reproduction data signal generated by the matrix circuit 2 is sent to the data signal processing circuit 3 and the system controller 5.
  • the data signal processing circuit 3 generates a binary data string by performing a binarization process on the reproduction data signal sent from the matrix circuit 2.
  • the binary data string generated by the data signal processing circuit 3 is sent to the decoding unit 4.
  • the decoding unit 4 demodulates the reproduction data from the binary data string sent from the data signal processing circuit 3.
  • the reproduction data decoded by the decoding unit 4 is sent to the host device 100 via the host interface 14 based on an instruction from the system controller 5 to reproduce desired video or audio.
  • the system controller 5 controls the servo circuit 12 so as to correct the spherical aberration caused by the difference in the thickness of the cover layer when reproducing the optical disk.
  • the servo circuit 12 sets a spherical aberration correction value for the spherical aberration correction driver 11 based on the control by the system controller 5, and causes the optical pickup 1 to perform spherical aberration correction based on the spherical aberration correction value.
  • FIG. 2 is a diagram showing the configuration of the optical pickup 1 according to Embodiment 1 of the present invention.
  • 3 is a view showing a cross-sectional structure of the optical disc according to Embodiment 1 of the present invention
  • FIG. 3 (a) is a view showing a cross-sectional structure of a two-layer BD
  • FIG. 3 (b) is a cross-sectional view of a DVD
  • FIG. 3C is a diagram showing a cross-sectional structure of a CD.
  • the optical pickup 1 has a wavelength of 405 nm, a laser diode (LD) 15 that outputs a laser beam corresponding to BD, and a laser beam that is output from the laser diode 15 via a collimator lens 16.
  • a beam splitter 17 that transmits the reflected light from the optical disk, a laser diode (LD) 18 that has a wavelength of 650 nm and outputs laser light corresponding to DVD and CD, and a collimator lens 19 from the laser diode 18.
  • the beam splitter 20 that reflects the laser beam output through the optical disc and transmits the reflected beam from the optical disc, and the laser beam transmitted from the beam splitter 17 or the beam splitter 20 is transmitted, and the spherical aberration correction for correcting the spherical aberration is performed.
  • a spherical aberration correcting collimator lens 22 having a drive mechanism 21;
  • An objective lens 23 for irradiating the optical disk with laser light that has passed through the collimator lens 22 for correcting spherical aberration, and a reflected light from the optical disk recording surface irradiated through the objective lens 23 are detected via the condenser lens 24.
  • a photodetector (DET) 25 a photodetector
  • the laser diode 15 shown in FIG. 2 When reproducing the BD, the laser diode 15 shown in FIG. 2 outputs a laser beam having a wavelength of 405 nm based on the control by the laser driver 13.
  • the laser light output from the laser diode 15 is collimated by the collimator lens 16, reflected by the beam splitter 17, transmitted through the beam splitter 20 and the spherical aberration correcting collimator lens 22, and irradiated from the objective lens 23 onto the optical disk. .
  • the reflected light reflected from the optical disk is transmitted through the objective lens 23, the spherical aberration correcting collimator lens 22 and the beam splitters 20 and 17 with respect to the laser light emitted from the objective lens 23, and is collected by the condenser lens 24.
  • the condensed light is incident on the photodetector 25.
  • the photodetector 25 detects the optical disc information of the BD from the reflected light.
  • the laser diode 18 shown in FIG. 2 outputs a laser beam having a wavelength of 650 nm based on the control by the laser driver 13.
  • the laser light output from the laser diode 18 is collimated by the collimator lens 19, reflected by the beam splitter 20, transmitted through the spherical aberration correcting collimator lens 22, and irradiated from the objective lens 23 onto the optical disk.
  • the reflected light reflected from the optical disk is transmitted through the objective lens 23, the spherical aberration correcting collimator lens 22 and the beam splitters 20 and 17 with respect to the laser light emitted from the objective lens 23, and is collected by the condenser lens 24.
  • the condensed light is incident on the photodetector 25.
  • the photodetector 25 detects DVD or CD optical disk information from the reflected light.
  • the optical disc information detected from the BD, DVD, or CD by the photodetector 25 of the optical pickup 1 is sent to the matrix circuit 2 as an electrical signal corresponding to the amount of received light.
  • a spherical aberration correction drive mechanism 21 that can move the spherical aberration correction collimator lens 22 built in the optical pickup 1 in the direction shown in FIG. 2 is provided, and the movement amount of the spherical aberration correction drive mechanism 21 is determined as a spherical aberration correction driver. 11, spherical aberration correction is executed.
  • the configuration of the spherical aberration correction drive mechanism 21 provided in the spherical aberration correction collimator lens 22 in the optical pickup 1 configured as described above will be described.
  • FIG. 4 is a diagram showing the configuration of the spherical aberration correction drive mechanism 21 according to the first embodiment of the present invention.
  • the spherical aberration correction drive mechanism 21 includes a collimator lens holding unit 26 that holds the collimator lens 22 for correcting spherical aberration, a shaft 27 that holds the collimator lens holding unit 26 movably, and spherical aberration correction.
  • the screw shaft 28 is configured to move the collimator lens 22
  • the stepping motor 29 is configured to rotate the screw shaft 28
  • the reference position detector 30 is configured to detect the reference position of the spherical aberration correcting collimator lens 22.
  • the spherical aberration correction drive mechanism 21 configured as described above first detects the reference position of the collimator lens 22 for correcting spherical aberration by the reference position detector 30 based on the control by the system controller 5.
  • the system controller 5 has a stepping motor having the number of drive steps corresponding to a distance equal to or more than the appropriate position farthest from the reference position detected by the reference position detection unit 30 among the appropriate positions for all media that can be played back by the optical disk playback device
  • a control signal is transmitted to the spherical aberration correction driver 11.
  • the spherical aberration correction driver 11 that has received this stepping motor control signal controls the driving of the stepping motor 29 so that the spherical aberration correction collimator lens 22 is positioned at an appropriate position for all media that can be reproduced by the optical disk reproducing apparatus. Of these, the position is moved to a position that is farthest from the reference position detected by the reference position detection unit 30 and beyond the appropriate position.
  • the system controller 5 transmits to the spherical aberration correction driver 11 a stepping motor control signal having the number of drive steps corresponding to the distance from the position where the spherical aberration correction collimator lens 22 is moved to the appropriate position with respect to the optical disc to be reproduced.
  • the spherical aberration correction driver 11 controls the driving of the stepping motor 29 to move the spherical aberration correction collimator lens 22 to an appropriate position with respect to the optical disc to be reproduced.
  • FIG. 5 is a diagram showing the movable range of the spherical aberration correcting collimator lens 22 and the appropriate position for each medium according to Embodiment 1 of the present invention.
  • N1 the position is appropriate for the BD-L1 layer
  • N2 the position is appropriate for CD.
  • N3 the position is appropriate for the DVD
  • N4 the position is appropriate for the BD-L0 layer.
  • the movable limit position of the spherical aberration correcting collimator lens 22 is set.
  • the number of driving steps to an appropriate position with respect to the CD is N2, but when the spherical aberration correcting collimator lens 22 is moved, it can be reproduced by an optical disk reproducing apparatus. After the spherical aberration correcting collimator lens 22 is moved to N5, which is the number of driving steps from the appropriate position of all the media to the position that is farthest from the reference position, the number of driving steps to the appropriate position for the CD (N5-N2) is moved.
  • the spherical aberration correcting collimator lens 22 By moving the spherical aberration correcting collimator lens 22 in this way, the entire range of movement of the spherical aberration correcting collimator lens 22 necessary for all the media that can be reproduced by the optical disk reproducing apparatus, regardless of the medium of the optical disk to be reproduced. Therefore, dust and the like adhering to the shaft 27 and the screw shaft 28 can be removed and grease can be lubricated. Therefore, when reproducing the BD, an increase in the movement load of the collimator lens 22 for correcting spherical aberration is avoided. In addition, since the spherical aberration correcting collimator lens 22 can be reliably moved to an appropriate position with respect to the BD, the BD can be reproduced.
  • the spherical aberration correcting collimator lens 22 when reproducing an optical disc, the spherical aberration correcting collimator lens 22 is moved beyond the movable range necessary for all media that can be reproduced by the optical disc reproducing apparatus. In the situation where the optical disk used every day is biased and the movement range of the collimator lens 22 for correcting spherical aberration is limited, it is used in a situation where it is moved to an appropriate position with respect to the optical disk to be reproduced.
  • the proper position of the spherical aberration correcting collimator lens 22 is set for DVD and CD, but originally, spherical aberration correction is performed for BD. Therefore, in the case of the optical pickup 1 in which the spherical aberration correcting collimator lens 22 is arranged only on the optical path of the laser beam with respect to the BD, there is no appropriate position with respect to the DVD and the CD. In this case, when the playback target is a DVD or CD, the system controller of the conventional optical disk playback apparatus controls the spherical aberration correcting collimator lens so that it does not move at all. It becomes easy to do.
  • the optical disk reproducing apparatus when the optical pickup 1 in which the spherical aberration correction collimator lens 22 is disposed only on the optical path of the laser beam with respect to the BD is provided, the BD, DVD, and CD.
  • the spherical aberration correction collimator lens 22 is configured to move beyond the appropriate position with respect to the BD, so that dust adhesion and corrosion due to aging can be removed, and spherical aberration correction can be performed. Therefore, the effectiveness of the present invention is further increased.
  • the spherical aberration correcting collimator lens 22 when reproducing an optical disk, the spherical aberration correcting collimator lens 22 is moved beyond the movable range necessary for all the media that can be reproduced by the optical disk reproducing apparatus. If there is a problem with the time delay from the insertion of the optical disk to the start of video or music playback, stop playback or carry out the optical disk when transporting the optical disk before startup.
  • the spherical aberration correcting collimator lens 22 may be moved beyond the movable range at a predetermined timing. Further, considering the situation where the optical disk is not inserted for a long time, it may be performed when the entire system is turned on / off.
  • the optical disk reproducing apparatus is free from dust and corrosion even in a situation where the daily-use media is biased and the spherical aberration correction collimator lens continues to be used in a limited range.
  • the optical disc reproducing apparatus In order to suppress an increase in the movement load of the spherical aberration correcting collimator lens due to the spherical aberration correcting collimator for all media that can be reproduced by the optical disc reproducing apparatus from the reference position detected by the reference position detecting unit at a predetermined timing.
  • the spherical aberration correction collimator lens Since the spherical aberration correction collimator lens is moved to a position more than the appropriate position farthest from the reference position among the appropriate positions of the lens, the spherical aberration correction collimator lens can be moved when reproducing the optical disk. Therefore, it is suitable for use in an optical disk reproducing apparatus or the like that performs spherical aberration correction.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)

Abstract

L'invention concerne un dispositif de reproduction de disque optique qui corrige l'aberration sphérique par déplacement d'une lentille de collimation (22), à utiliser pour la correction de l'aberration sphérique, pour corriger des positions pour tous les supports reproductibles. Le dispositif de reproduction de disque optique est pourvu d'une section détection de position de référence (30), qui détecte une position de référence de la lentille de collimation; et un lecteur de correction d'aberration (11), qui déplace la lentille de collimation vers une position correcte pour le support le plus éloigné de la position de référence ou encore en synchronisation prédéterminée.
PCT/JP2009/002737 2009-06-16 2009-06-16 Dispositif de reproduction de disque optique Ceased WO2010146627A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2009/002737 WO2010146627A1 (fr) 2009-06-16 2009-06-16 Dispositif de reproduction de disque optique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2009/002737 WO2010146627A1 (fr) 2009-06-16 2009-06-16 Dispositif de reproduction de disque optique

Publications (1)

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WO2010146627A1 true WO2010146627A1 (fr) 2010-12-23

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PCT/JP2009/002737 Ceased WO2010146627A1 (fr) 2009-06-16 2009-06-16 Dispositif de reproduction de disque optique

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08335375A (ja) * 1995-06-06 1996-12-17 Olympus Optical Co Ltd 情報記録再生装置
JPH09245447A (ja) * 1996-03-12 1997-09-19 Zexel Corp 光学式記録媒体のための再生装置
JP2006120283A (ja) * 2004-10-25 2006-05-11 Matsushita Electric Ind Co Ltd 光ピックアップ装置及び光ディスク装置
WO2007046256A1 (fr) * 2005-10-18 2007-04-26 Mitsubishi Electric Corporation Dispositif a tete optique et dispositif a disque optique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08335375A (ja) * 1995-06-06 1996-12-17 Olympus Optical Co Ltd 情報記録再生装置
JPH09245447A (ja) * 1996-03-12 1997-09-19 Zexel Corp 光学式記録媒体のための再生装置
JP2006120283A (ja) * 2004-10-25 2006-05-11 Matsushita Electric Ind Co Ltd 光ピックアップ装置及び光ディスク装置
WO2007046256A1 (fr) * 2005-10-18 2007-04-26 Mitsubishi Electric Corporation Dispositif a tete optique et dispositif a disque optique

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