WO2002082436A1 - Detecteur de vibrations, et dispositif a disque optique equipe de ce detecteur - Google Patents

Detecteur de vibrations, et dispositif a disque optique equipe de ce detecteur Download PDF

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Publication number
WO2002082436A1
WO2002082436A1 PCT/JP2002/002784 JP0202784W WO02082436A1 WO 2002082436 A1 WO2002082436 A1 WO 2002082436A1 JP 0202784 W JP0202784 W JP 0202784W WO 02082436 A1 WO02082436 A1 WO 02082436A1
Authority
WO
WIPO (PCT)
Prior art keywords
vibration
optical disk
detecting
electromotive force
induced electromotive
Prior art date
Application number
PCT/JP2002/002784
Other languages
English (en)
Japanese (ja)
Inventor
Junichi Ando
Toyokazu Arai
Original Assignee
Mitsumi Electric Co., Ltd.
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 Mitsumi Electric Co., Ltd. filed Critical Mitsumi Electric Co., Ltd.
Publication of WO2002082436A1 publication Critical patent/WO2002082436A1/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
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • 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
    • G11B19/04—Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions
    • 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
    • G11B7/0946—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 specially adapted for operation during external perturbations not related to the carrier or servo beam, e.g. vibration
    • 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
    • G11B7/0925—Electromechanical actuators for lens positioning
    • G11B7/0927—Electromechanical actuators for lens positioning for focusing only

Definitions

  • the present invention relates to a vibration detecting device and an optical disk device provided with the vibration detecting device.
  • the present invention relates to an optical disk device that performs writing and Z or reading on an optical disk, and a vibration detection device used in the optical disk device.
  • An optical disc may vibrate greatly when a defective optical disc having eccentricity or deformation is driven to rotate, or when an optical disc clamping error occurs.
  • the degree of such vibration exceeds the range of vibration that can be corrected by the optical pickup of the optical disk device, writing and reading on the optical disk become impossible. Further, if the vibration further increases, the rotating optical disk may separate from the clamper and become jammed in the optical disk device, or a failure may occur in a drive device such as a motor provided in the optical disk drive device. Or
  • a vibration detecting device 30 as shown in FIG. 4, for example, is conventionally provided inside the optical disk device.
  • the vibration detecting device 30 includes, for example, a vibration sensor 31 using a solid sensor such as a strain sensor and an impact sensor, a detection circuit 32 detecting an induced electromotive force from the vibration sensor 31, A microcomputer 33 controls a drive device of the optical disk based on a signal detected by the detection circuit 32.
  • the vibration sensor 31 detects a vibration larger than a normal minute vibration
  • the rotation of the optical disc is stopped under the control of the microcomputer 33 so that the above-described trouble does not occur. It is configured.
  • the above-described conventional vibration detection device 30 uses a vibration sensor to detect vibration.
  • the use of —3 1 increases the cost of the vibration sensor 31, and requires a space for installing the vibration sensor 31 in the optical disk device 3, reducing the cost of the optical disk device and making it lighter, thinner and shorter. It is a cause to inhibit. Disclosure of the invention
  • the present invention can detect the vibration of an optical disk device without using another sensor such as a vibration sensor, and can reduce the cost of the device. It is an object of the present invention to provide a detection device and an optical disk device provided with the vibration detection device.
  • the present invention relates to a vibration detecting device used in an optical disk device comprising: an optical disk driving means for driving an optical disk to rotate; and an optical pickup for writing, Z, or reading from or to the optical disk.
  • the vibration detecting device includes a detecting unit that detects an induced electromotive force generated from at least one driving unit inside the optical disk device excluding the optical disk driving unit due to the vibration of the optical disk device. It is characterized in that vibration is detected based on the detected induced electromotive force.
  • the vibration detecting device of the present invention described above does not provide a vibration sensor or the like as another element for detecting vibration as in a conventional optical disk device, but instead employs a pickup pickup optical pickup coil. Since the vibration detection function is added to the existing elements, such as a coil for Trakkinda Service, the use of the vibration detection device can reduce the number of parts and thereby reduce the cost of the optical disk device. Become.
  • this vibration detecting device does not require a space for installing a new vibration sensor inside the optical disk device unlike the conventional optical disk device, so that the device can be reduced in weight and thickness.
  • the detecting means detects the induced electromotive force when the optical disc is rotationally driven and when the driving means for detecting the induced electromotive force is not driven. It is configured to detect.
  • the detecting means is configured to detect an induced electromotive force generated from a coil of the actuator for driving an objective lens of the optical pickup.
  • the detection means includes a motor serving as a drive means for displacing a pickup base on which an objective lens of the optical pickup and an actuator for driving the objective lens are mounted in a radial direction of the optical disc. It is configured to detect the induced electromotive force generated from the coil.
  • the detection means includes a frequency detection circuit for detecting a frequency of the induced electromotive force from the coil.
  • the frequency to be detected is a frequency corresponding to a rotation speed of the optical disc.
  • the frequency detection circuit is a band pass filter.
  • the detecting means is configured to detect a vibration of the optical disk device during a period from the start of the rotation drive of the optical disk to the start of the writing or reading of the optical disk by the pickup.
  • Another embodiment of the present invention relates to an optical disk device including the vibration detection device having the above-described configuration.
  • FIG. 1 is a block diagram showing the configuration of the optical disk device of the present invention.
  • FIG. 2 is a perspective view of a main part of the optical pickup according to the optical disc device of the present invention.
  • FIG. 3 is a flowchart showing a control operation of the control unit when detecting vibration by the vibration detecting device according to the optical disc device of the present invention.
  • FIG. 4 is a block diagram showing a configuration of a conventionally used vibration detecting device.
  • FIG. 1 is a block diagram showing the overall configuration of the optical disk device of the present invention.
  • the optical disk device 1 of the present invention is an optical disk device for writing and reading data on and from an optical disk (optical recording medium) represented by a CD, MD, MO (magneto-optical disk), DVD, etc.
  • an optical disk optical recording medium
  • FIG. 1 a motor 11 for rotating and driving the optical disk 2
  • a control unit 12 for controlling rotation of the motor 11 and movement of an optical pickup 20 described later
  • An optical pickup 20 for writing (recording) and reading (reproducing) information is provided.
  • the motor 11 is provided with a turntable 18 for mounting the optical disk 2 in the same manner as a conventional optical disk device.
  • the motor 11 is connected to a power supply (not shown) and a control unit 12 that controls the rotation of the motor 11.
  • FIG. 2 is a perspective view of a main part of the optical pickup 20 according to the optical disc device 1 of the present invention.
  • a beam from a laser diode (not shown) is applied to a predetermined position on the recording surface of the optical disk 2 in the same manner as an optical pickup used in a conventional optical disk device.
  • An objective lens 21 for converging light on the lens, a lens holder 22 for supporting the objective lens 21, and a damper base 23 for swingably supporting the lens holder 22 are provided.
  • the lens holder 22 has a servo for moving the lens holder 22 in the thickness direction of the optical disk 2 (the optical axis direction of the objective lens 21), that is, a focusing coil coil 2 for performing a focusing servo.
  • These coils and magnets (not shown) disposed on the damper base 23 at a predetermined interval are provided.
  • the lens holder 22 is provided with two suspension panels 26 provided on each of the upper and lower sides, and the thickness direction (focal cutting direction) of the optical disk 2 and the It is supported by the damper base 23 so as to be swingable in a direction (tracking direction) parallel to the recording surface.
  • the vibration detecting device 10 includes a focusing servo coil 24 and a vibration detecting circuit 1 that detects an induced electromotive force generated in the focusing Sinder servo coil 24. And a control unit 12 that controls the motor 11 based on the detection result from the vibration detection circuit 13.
  • the focusing coil support coil 24 includes a driving circuit (not shown) used for driving the focusing coil support coil 24 and a vibration of the optical disc apparatus 1 when the optical disc 2 rotates. It is connected to a vibration detection circuit 13 for detection and forms a part of the vibration detection device 10 of the optical disk device 1.
  • the vibration detecting device 10 is configured to control the induction induced by the change in the magnetic flux from the magnet (not shown) penetrating through the fork sine sinker coil 24. Vibration is detected based on electric power. That is, the vibration is generated by the vibration detection circuit 13 connected to the coil for the servo coil for servo 24 and the potential difference between the two poles (between both terminals) of the coil for the coil for the coil spring 24. It is detected by measuring the value.
  • the change in the magnetic flux changes the relative positional relationship between the damper base 23 and the lens holder 22 swingably supported by the damper base 23 due to the vibration of the optical disc device 1. Accordingly, the relative positional relationship between the magnet provided on the damper base 23 and the focusing coil support coil 24 provided on the lens holder 22 changes. Occurs.
  • the vibration detection circuit 13 is, as shown in FIG.
  • An amplifier 14 that amplifies the induced electromotive force from the coil 24, and outputs a signal to a comparator circuit 16 described later only when the frequency of the signal from the amplifier 14 is a predetermined value or a value within a predetermined range.
  • a comparator circuit 16 for binarizing the signal output from the band-pass filter 15 at a predetermined threshold value, and a peak value of the signal from the comparator circuit 16
  • a latch circuit 17 for sending the signal to the control unit 12.
  • the bandpass filter 15 detects the frequency of the induced electromotive force from the amplifier 14 and sends the signal to a comparator circuit 16 described later only when the frequency of the induced electromotive force is a predetermined value or a value within a predetermined range. It is provided to output signals to prevent noise during vibration detection and improve detection accuracy.
  • the frequency of the vibration of the optical disk device 1 generated by rotating the optical disk 2 in which eccentricity or deformation has occurred becomes a substantially constant value corresponding to the rotation speed of the optical disk 2. Therefore, the frequency of the induced electromotive force from the focusing coil support coil 24 generated by this vibration also has a constant value depending on the rotation speed of the optical disc 2, and thus a signal of a frequency within a predetermined range defined in advance. Only the bandpass filter 15 is used to detect only noise, so that noise during vibration detection can be prevented, and erroneous detection of vibration can be prevented.
  • the bandpass filter 15 detects the frequency of the induced electromotive force, and the frequency is used as the rotation of the optical disc device 1.
  • a signal is output to the comparator circuit 16 only when the value is a predetermined value determined according to the number or within a predetermined range.
  • the signal from the bandpass filter 15 is input to the comparator circuit 16. Then, the comparator circuit 16 binarizes the signal at a predetermined threshold and sends it to the latch circuit 17.
  • the latch circuit 17 holds the peak value of the signal from the comparator circuit 16, and the CPU of the control unit 12 includes, for example, a CPU. To other ports.
  • the amplifier 14 need not be provided if the induced electromotive force from the focusing coil 24 is sufficiently large to be detected by the vibration detection circuit 13. Further, it is possible to select whether or not to install the latch circuit 17 as needed.
  • the vibration detecting device 10 of the present embodiment is configured such that when the optical disk 2 is rotating and the focus coil coil 24 is not driven, that is, power is supplied to the focus coil coil 24.
  • the vibration of the optical disk device 1 is detected, and the rotation speed of the motor 11 is controlled.
  • FIG. 3 is a flowchart showing a control operation of the control unit when the vibration detection device 10 detects vibration.
  • the control unit 12 sets the motor 11 to a first rotation speed higher than a second rotation speed described later. (S101). At this time, the control of the optical pickup 20 was not performed, and the focusing servo coil 24 for driving the objective lens 21 of the optical pickup 20 was energized. Not done.
  • control unit 12 reads the port of the CPU provided therein (S 102)
  • the value read into the control unit 12 is the induced electromotive force generated by the focus cutting coil 24, that is, the output from the vibration detection circuit 13.
  • the control unit 12 controls the number of rotations of the motor 11 according to the value of the output signal (S103).
  • the control unit 12 determines that vibration has not been detected from the optical disc device 1 (S104), and The rotation of the motor 11 is continued (S105).
  • the control unit 12 determines that vibration has been detected from the optical disc device 1 (S106), and sets the motor 11 to the first rotation speed. It is rotated at a lower second rotation speed (S107).
  • control unit 12 detects the vibration of the optical disc device 1 by detecting the output signal from the vibration detection circuit 13 even after the optical disc 2 is rotated at the second rotation speed. The number of rotations of the optical disk 2 is controlled.
  • control unit 12 reads the port of the CPU again (S108), and when the output signal from the vibration detection circuit 13 in S109 is the one-level signal, the control unit 12 It is determined that the vibration from the optical disk device 1 has not been detected (S110), and the rotation of the motor 11 at the second rotation speed is continued (S111).
  • the control unit 12 determines that vibration from the optical disc device 1 has been detected (S112), and turns off the motor 11 The motor is rotated at a third rotation speed lower than the second rotation speed (S113).
  • control unit 12 controls the optical pickup 20 after the vibration detection operation described in the flowchart of FIG.
  • the vibration of the optical disk device 1 is detected from the start of the rotation drive of the optical disk 2 to the start of writing and reading to and from the optical disk 2.
  • the invention is not limited to this.
  • the lens holder 22 is moved by the forcible shield coil 24. It is also possible to perform when the driving stops.
  • the optical disc 2 is first rotated at a high rotation speed, and when the vibration is detected, the vibration is reduced by gradually reducing the rotation speed.
  • the present invention is not limited to this embodiment. First, the rotational speed is gradually increased from a low rotational speed, and when the vibration is detected, the increase in the rotational speed is stopped. It is also possible to adopt a configuration in which the optical disc 2 is rotated at a stepwise lower rotation speed. The reduction in the number of rotations includes stopping the rotation of the optical disc 2.
  • the vibration detecting device 10 of the present invention is not limited to the focusing servo coil 24 used in the present embodiment, and can detect vibration using other driving means.
  • the vibration detecting device 10 of the present invention includes a tracking support coil 25 of the optical pickup 20, a pickup base driving motor used for the pickup base driving mechanism, or a pickup optical disk 2 transporting motor. Vibration can be detected using any driving means such as a driving motor for a disk tray, which is a driving means that stops driving for a certain period of time or more while the optical disc 2 is rotating. It is of course possible to detect vibration by using two or more of these driving means.
  • the vibration detecting device 10 of the present invention is different from the above-described conventional optical disk device 30 in that the vibration sensor 31 is not provided as another element for detecting vibration, but the optical pickup 2 is not provided. Since the vibration detection function is added to the existing elements such as the coil 24 for tracking and the coil 25 for tracking service, the parts can be obtained by using the vibration detection device 10. The cost reduction of the optical disk device 1 due to the decrease in the number and the simplification of the circuit configuration can be achieved. Also, this vibration detecting device 10 does not require a space for installing a new vibration sensor 31 inside the device unlike the conventional optical disk device 30 described above, so that the device can be made lighter, thinner and shorter. It becomes possible.
  • the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications and improvements can be made within the scope described in the claims.
  • the vibration detection accuracy of the optical disk device can be improved by using the vibration detection device of the present embodiment together with a conventionally used vibration sensor or the like.
  • the optical disk device of the present embodiment can be applied to not only the optical disk device described in the present embodiment but also disk devices of other configurations.
  • the vibration detection device of the present invention does not provide a vibration sensor or the like as another element for detecting vibration as in a conventional optical disc device, but instead uses a focusing sensor for optical pickup. Since a vibration detection function is added to existing elements such as coils and coils for tracking support, the use of the vibration detection device reduces the number of components and the cost of the optical disc device. Down becomes possible.
  • this vibration detecting device does not require a space for installing a new vibration sensor inside the optical disk device unlike the conventional optical disk device, so that the device can be reduced in weight and thickness.

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  • Optical Recording Or Reproduction (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)

Abstract

L'invention concerne la détection des vibrations d'un dispositif à disque optique (1): on détecte la force électromotrice induite engendrée, lorsque le dispositif à disque optique vibre en raison de la rotation d'un disque (2), par la bobine d'un actionneur ou d'un moteur se trouvant dans le dispositif, du type bobine de concentration asservie (20) placée à l'intérieur d'une tête optique (20). Cette configuration permet de détecter les vibrations du dispositif sans utiliser d'autre capteur qu'un capteur de vibrations, et aussi de réduire le coût, le poids et la taille du système.
PCT/JP2002/002784 2001-03-30 2002-03-22 Detecteur de vibrations, et dispositif a disque optique equipe de ce detecteur WO2002082436A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001-097983 2001-03-30
JP2001097983A JP2002298389A (ja) 2001-03-30 2001-03-30 振動検出装置および該振動検出装置を備えた光ディスク装置

Publications (1)

Publication Number Publication Date
WO2002082436A1 true WO2002082436A1 (fr) 2002-10-17

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PCT/JP2002/002784 WO2002082436A1 (fr) 2001-03-30 2002-03-22 Detecteur de vibrations, et dispositif a disque optique equipe de ce detecteur

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JP (1) JP2002298389A (fr)
CN (1) CN1460253A (fr)
WO (1) WO2002082436A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6934227B2 (en) 2001-09-06 2005-08-23 Matsushita Electric Industrial Co., Ltd. Optical disk device, semiconductor integrated circuit, pickup control method and vibration component detection method
CN100401392C (zh) * 2004-01-26 2008-07-09 皇家飞利浦电子股份有限公司 抗震光记录和再现设备
KR101166418B1 (ko) 2011-08-24 2012-07-19 김영준 이동단말기의 자동초점 카메라 모듈용 렌즈 액츄에이터의 변위 및 진동 측정장치 및 그 측정방법

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11328836A (ja) * 1998-05-15 1999-11-30 Samsung Electronics Co Ltd 光ディスク装置の偏重心ディスク検出機構

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11328836A (ja) * 1998-05-15 1999-11-30 Samsung Electronics Co Ltd 光ディスク装置の偏重心ディスク検出機構

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JP2002298389A (ja) 2002-10-11
CN1460253A (zh) 2003-12-03

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