WO2002061738A1 - Unite de disque - Google Patents

Unite de disque Download PDF

Info

Publication number
WO2002061738A1
WO2002061738A1 PCT/JP2002/000615 JP0200615W WO02061738A1 WO 2002061738 A1 WO2002061738 A1 WO 2002061738A1 JP 0200615 W JP0200615 W JP 0200615W WO 02061738 A1 WO02061738 A1 WO 02061738A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
fcm
track
control
period
Prior art date
Application number
PCT/JP2002/000615
Other languages
English (en)
Japanese (ja)
Inventor
Tadashi Okajima
Hideaki Yano
Original Assignee
Sanyo 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 Sanyo Electric Co.,Ltd. filed Critical Sanyo Electric Co.,Ltd.
Publication of WO2002061738A1 publication Critical patent/WO2002061738A1/fr

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
    • 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
    • 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
    • G11B19/28—Speed controlling, regulating, or indicating

Definitions

  • the present invention relates to a disk device, in particular, for example, a plurality of tiers having mutually different optimum rotational speeds are assigned to a recording surface, a track is formed on the recording surface, and a predetermined mark is formed at predetermined intervals on the track.
  • the present invention relates to a disk device for rotating a recording medium by spinning light and irradiating a recording surface with a laser beam by optical pickup to detect a predetermined mark signal related to the predetermined mark.
  • Magneto-optical discs such as ASM0 (Advanced Storage Magneto Optical disc) adopt the ZCLV (Zone Constant Linear Velocity) method for the rotation speed. Therefore, the angular velocity must be constant in each of a plurality of zones (areas) formed on the recording surface.
  • FCMs Fluorescence Clock Marks
  • ASMO ASMO
  • various operations such as disk rotation speed are controlled by FCM signals based on the reflected light when tracing the FCM. can do.
  • Such a magneto-optical disk when the spindle servo comes off due to disturbances such as dropping or vibration of the device or electric noise, and the spindle speed becomes lower than the specified range, the recording medium unit. The energy irradiated by the laser per area increases, and the data on the recording medium is destroyed.
  • the recording / reproducing device for disk media that performs LV control detects the period of the FG signal generated by the rotation of the spindle motor that rotates the disk, and if this value is not within the specified range corresponding to CLV Was in an emergency state and was performing control to return to normal control again.
  • the prescribed range corresponding to CLV is the period of the FG signal when the pickup is at the innermost circumference to the cycle of the FG signal when the pickup is at the outermost circumference, and the period of the FG signal detected in this range. It is to determine whether the condition is normal or emergency depending on whether or not is entered.
  • the number of revolutions changes according to the position of the pickup in the radial direction, and the period of the FG signal also changes.
  • the range allowed as a normal state is wide, so that accurate discrimination cannot be performed, and there is a problem that a quick response when the servo comes off cannot be performed.
  • a main object of the present invention is to quickly determine whether or not the rotation control of a disk is accurately performed in a CLV-controlled disk recording / reproducing apparatus regardless of the radial position of the pickup. In the event of an emergency where the linear velocity of the disk is low, the data is not destroyed.
  • a disk device in which a disk recording medium having predetermined marks formed on a track at predetermined distances is rotated by a spindle motor and a laser beam is irradiated on the track by a semiconductor laser Detecting a period of a predetermined mark signal detected by signal detection means for detecting a predetermined mark signal related to the predetermined mark based on reflected light from a track, and determining a difference between the period and the reference period by a predetermined value. If greater, turn off the semiconductor laser. Further, a predetermined mark is formed on the track at a predetermined distance.
  • the spindle motor rotates such a disk recording medium, and the optical pickup irradiates the recording surface of such a disk recording medium with laser light. By irradiating the laser light, a predetermined mark signal related to the predetermined mark is detected.
  • the generation period of the detected predetermined mark signal is measured, and it is determined whether or not the value of the measured period is within a predetermined range.
  • FIG. 1 is a block diagram showing one embodiment of the present invention
  • FIG. 2 is an illustrative view showing a plurality of zones formed on the magneto-optical disk.
  • Figure 3 is an illustrative view showing land tracks, groove tracks and fine clock marks formed on the recording surface of the magneto-optical disk
  • FIG. 4 (A) is a waveform diagram showing the FCM signal detected from the land track
  • FIG. 4 (B) is a waveform diagram showing an FCM pulse based on the FCM signal shown in FIG. 4 (A);
  • FIG. 4 (C) is a waveform diagram showing an FCM signal detected from a groove track
  • FIG. 4 (D) is a waveform diagram showing an FCM pulse based on the FCM signal shown in FIG. 4 (C);
  • Figure 5 is a circuit diagram showing the photodetector, TE signal detection circuit, FE signal detection circuit and FCM signal detection circuit;
  • FIG. 6 (A) is a waveform diagram showing an example of a change in the rotation speed of the spindle motor
  • FIG. 6 (B) is a waveform diagram showing an example of a change in the TE signal
  • FIG. FIG. 7 is a waveform diagram showing another example of a change in the rotation speed of the motor
  • FIG. 7B is a waveform diagram showing another example of the change of the TE signal
  • FIG. 8 is a flowchart showing a part of the operation of the CPU
  • FIG. 9 is a flowchart showing another part of the operation of the CPU.
  • Figure 10 is a flowchart showing a part of the operation of DSP
  • FIG. 11 is a flowchart showing another part of the operation of the DSP.
  • FIG. 12 is a flowchart showing another part of the operation of the DSP. BEST MODE FOR CARRYING OUT THE INVENTION
  • an optical disk device 10 of this embodiment includes an optical pickup 12 provided with an optical lens 14.
  • the optical lens 14 is supported by a tracking function 16 and a focus function 18, and the laser light emitted from the laser diode 20 is converged by such an optical lens 14 and ASM Irradiation is performed on the recording surface of the magneto-optical disk 48 such as ⁇ .
  • ASM Irradiation is performed on the recording surface of the magneto-optical disk 48 such as ⁇ .
  • the magneto-optical disk 48 employs the ZCLV method, and a plurality of zones (areas) 0 to 13 are formed on the recording surface from the outer periphery to the inner periphery as shown in FIG.
  • the number of frames per track is the same, but if the band is different, the same number of frames is not guaranteed. Also, since the length of one track is shorter on the inner circumference than on the outer circumference, the number of frames per track decreases from the outer circumference toward the inner circumference. Furthermore, in each zone, one frame is 2048 bytes, and the data transfer rate during recording and Z playback must be constant regardless of the zone. Therefore, the rotation speed (optimum rotation speed) of the magneto-optical disk 48 increases from the outer circumference toward the inner circumference.
  • convex land tracks and concave group tracks are alternately formed every other track on the surface of the magneto-optical disk 48, and each track is provided with an FCM at a predetermined interval. Embossed. That is, the FCM on the land track is formed concavely, and the FCM on the groove track is formed convexly. Note that the number of FCMs allocated to one frame is 39 in both the land track and the group track.
  • the reflected light from the recording surface passes through the optical lens 14 and irradiates the photodetector 22.
  • the output of the photodetector 22 is input to the FE signal detection circuit 24 and the TE signal detection circuit 26, where the FE signal (focus error signal) and the TE signal (tracking error signal) are detected.
  • the detected FE signal and TE signal are supplied to a DSP (Digital Signal Processor) 40 via AZD converters 38a and 38b, respectively.
  • DSP Digital Signal Processor
  • DSP 40 performs focus servo processing based on the FE signal, Executes tracking servo processing based on the TE signal.
  • a focus actuator control signal is generated by the focus servo processing and output to the focus actuator 18 via the DZA converter 42a.
  • a tracking function control signal and a thread control signal are generated by the tracking servo processing, and the tracking function control signal and the thread control signal are generated from the DZA converter 42b and the PWM signal generation circuit 42c. Output to Domo overnight 44.
  • the output of the photodetector 22 is also input to the FCM signal detection circuit 28.
  • the FCM signal detection circuit 28 generates a fine clock mark signal (FCM signal) based on the reflection light of the FCM formed on the magneto-optical disk 48.
  • FCM signal changes as shown in FIG. 4 (A) when the laser beam follows the land track, and changes as shown in FIG. 4 (C) when the laser beam follows the group track.
  • the generated FCM signal is supplied to a peak hold circuit 32 via a VCA (Voltage Control Amplifier) 30.
  • the peak hold circuit 32 detects the peak level of the FCM signal and outputs a peak hold signal indicated by a dashed line in FIG. 4 (A) or FIG. 4 (C).
  • the output peak hold signal is given to the DSP 40 via the A / D converter 38c ⁇ ).
  • the DSP 40 generates a gain control signal for controlling the gain of the VCA 30 and a slice signal for slicing the FCM signal based on the input peak hold signal.
  • the gain control signal is supplied to the VCA 30 via the D / A converter 42e, and the slice signal is supplied to the comparator 34 via the D / A converter 42d.
  • the slice signal is obtained by multiplying the level (peak level) of the peak hold signal by a predetermined value (0 ⁇ hi ⁇ 1). The slice level indicated by the dotted line in FIG. 4 (A) or FIG. Have O
  • the comparator 34 compares the level of the FCM signal output from the variable gain amplifier 30 with the level of the slice signal output from the D / A converter 42e. If FCM level> slice level, a high level signal is output, and if FCM level ⁇ slice level, a low level signal is output. As a result, the comparison signal shown in Fig. 4 (B) for the FCM signal shown in Fig. 4 (A) and the comparison signal shown in Fig. 4 (D) for the FCM signal shown in Fig. 4 (C). The signal is output from Compare Night 34. The rising period of this comparison signal matches the period of the FCM signal.
  • the divider circuit 36 divides the FCM pulse output from the comparator 34 by 39. As described above, since 39 FCMs are allocated per frame, the output (frequency-divided pulse) of the frequency divider 36 rises every frame. Such a divided pulse is input to the DSP 40 via a PWC (Pulse Width Counter) 38d.
  • PWC Pulse Width Counter
  • the magneto-optical disk 48 is mounted on a spindle 50, and the spindle 50 is supported by a spindle motor 52.
  • the spindle motor 52 is driven by a motor driver 54, and with the rotation of the spindle motor 52, the spindle 50 and thus the magneto-optical disk 48 rotate.
  • the driver 54 detects the rotation speed of the spindle motor 52 and outputs an FG pulse related to this rotation speed to the DSP 40.
  • the DSP 40 generates a PWM pulse for controlling the driver 54 based on the frequency-divided pulse output from the PWC 38d or the FG pulse output from the driver 54.
  • a PWM pulse is generated based on the frequency-divided pulse (FCM control), tracking is lost, and the FCM signal is generated.
  • FCM control frequency-divided pulse
  • FG control FG control
  • the driver 54 rotates the spindle motor 52 at a speed corresponding to the pulse width of the generated PWM pulse.
  • the FCM is formed at a predetermined interval regardless of the band. Therefore, when the FCM signal is detected (at the time of the FCM control), the PWM pulse is generated so that the period of the divided pulse becomes a predetermined value. By controlling the pulse width, the spin Dormo 52 rotates at the optimum speed for each band.
  • the pulse width of the PWM pulse that is, the pulse width of the PWM pulse (that is, the FG pulse only) is used. Spindle speed (rotational speed of 52) cannot be properly controlled.
  • a table 46a in which the band and the target FG cycle are associated is prepared in advance in the internal memory of the CPU (system controller) 46, and the target FG cycle corresponding to the desired band is processed by the CPU 46 by the DSP 46.
  • the DSP 40 controls the pulse width of the PWM pulse based on the FG pulse given from the motor driver 54 and the target FG cycle set by the CPU 46.
  • the FCM signal cannot be detected not only when unintentional derailment occurs due to vibration or the like, but also when moving to another band (during seek).
  • the optimal rotational speed in the destination band will be the same as the optimal rotational speed of the current band. Therefore, when moving to another band, if the pulse width of the PWM pulse is controlled based on the target FG cycle corresponding to the band before the movement, the rotation speed immediately after the movement is completed and the optimum rotation speed in the destination band Will be displaced between them.
  • FIGS. 6 (B) and 7 (B) are waveform diagrams showing TE signals.
  • FIG. 6 shows a case where the optimum rotation speed of the destination band is faster than the optimum rotation speed of the band before movement.
  • the rotation speed of the spindle motor 52 rapidly increases with the start of the FG control, and reaches the optimum rotation speed of the movement destination band during the FG control.
  • the spindle motor 52 continues to rotate at the rotation speed before the return.
  • FIG. 7 shows a case where the optimum rotation speed of the band at the movement destination is faster than the optimum rotation speed of the band before movement. At this time, the rotation speed of the spindle motor 52 rapidly decreases with the start of the FG control.
  • the optical pickup 12 reaches the target band, the rotation speed of the spindle motor 52 is stable, and the same rotation speed is maintained after returning to the FCM control.
  • the photodetector 22, the FE signal detection circuit 24, the TE signal detection circuit 26, and the FCM signal detection circuit 28 are configured as shown in FIG.
  • the light detector 22 includes four detection elements 22a to 22d.
  • the outputs of a to 22 d are subjected to different calculations in the FE signal detection circuit 24, the TE signal detection circuit 26, and the FCM signal detection circuit 28.
  • Equation 1 is calculated in the FE signal detection circuit 24
  • Equation 2 is calculated in the TE signal detection circuit 26
  • Equation 3 is calculated in the FCM signal detection circuit 28.
  • “A” "in Equations 1 to 3 respectively correspond to the outputs of the detection elements 22a to 22d.
  • the CPU 46 operates according to the flowcharts shown in FIGS. 8 and 9, and the DSP 40 operates according to the flowcharts shown in FIGS.
  • the DSP 40 is actually formed by a logic circuit, but for convenience of explanation, a flow chart is used.
  • step S1 when power is turned on, CPU 46 resets a focus control flag and a tracking control flag in step S1.
  • the resetting of the focus control flag requests the DSP 40 to execute the focus servo and suspending the Z operation.
  • the resetting of the tracking control flag requires the DSP 40 to execute / suspend the tracking servo. Things. Therefore, in step S1, the DSP 40 is requested to suspend the focus servo and the tracking servo.
  • “1 A 48 H” is the target FG cycle of band 0 assigned to the outermost periphery of the magneto-optical disk 48.
  • the set state of the FG flag requests a transition from the FCM control to the FG control, and the reset state of the FG flag requests a transition from the FG control to the FCM control. For this reason, Execution of FG control is requested to DSP 40 by the processing of step S5.
  • step S7 the DSP 40 is instructed to move the optical pickup 12 to the outermost periphery of the magneto-optical disk 48.
  • steps S9 and S11 the mode driver 54 and the laser diode 20 are activated. Start it up. When the light pickup 1 and 2 reach the destination (destination track): DSP
  • step S13 it is determined whether or not the optical pickup 12 has reached the destination based on the arrival notification.
  • the focus control flag and the tracking control flag are set in step S15, and the execution of the focus servo and the tracking servo is requested to the DSP 40.
  • the CPU 46 determines in step S17 whether a seek instruction has been given. If YES here, the destination band is specified in step S19, and the target FG cycle corresponding to the destination band is detected from the table 46a in step S21, and the detection is performed. Target FG cycle
  • step S25 requesting suspension of the focus servo and tracking servo
  • step S27 the target bank is reset. Command the DSP 40 to move the optical big-cap 12 to the code.
  • step S31 when the arrival notification is returned from the DSP 40, it is determined that the destination has been reached in step S29, and the focus control flag and the tracking control flag are set in step S31. In other words, the DSP 40 is requested to execute the focus servo and the tracking servo. Upon completion of the process in the step S31, the process returns to the step S17.
  • the DSP 40 processes the main routine shown in FIG. 10 at a predetermined time every evening interrupt.
  • step S41 a movement instruction from CPU 46 is issued. Determine whether there is an input.
  • step S43 the optical pickup 12 is moved by driving the sled monitor 44.
  • step S45 When the optical pickup 12 arrives at the destination, it is determined as YES in step S45, and an arrival notification is issued to the CPU 42 in step S47.
  • step S49 the state of the focus control flag is determined. If it is in the reset state, the focus servo is performed in step S51, and then the process proceeds to step S53. If it is in the reset state, the process directly proceeds to step S53.
  • step S53 the state of the tracking control flag is determined. If it is in the set state, the tracking servo and the thread servo are executed in step S55, and after returning from the detection of tracking in step S57, the process returns. If it is in the reset state, it returns. Return.
  • the tracking deviation detection in step S57 follows the subroutine shown in FIG.
  • the DSP 40 first detects the maximum level of the TE signal in step S61, and compares the detected maximum level with a predetermined threshold in step S63. If the maximum level is greater than the threshold value, it is determined that tracking error has not occurred, and the tracking error flag is reset in step S67, and then the process returns. On the other hand, if the TE signal level is less than or equal to the threshold, it is considered that a tracking error has occurred, and the tracking error flag is set in step S65, and then the process returns.
  • step S71 the state of the FG flag is determined. If the FG flag is set, the process proceeds to step S73 to perform FG control. If the FG flag is reset, the process proceeds to step S77 to perform FCM control.
  • step S73 first, the FG pulse is captured in this step, and the cycle of the FG pulse is detected.
  • step S75 the target FG cycle is detected: The deviation from the FG cycle is determined. That is, the FG cycle detected in step S73 is subtracted from the target FG cycle set by the CPU 46, and the subtracted value is used as a deviation.
  • step S82 a PWM pulse width that eliminates the deviation calculated in step S75 is determined, and in step S83, a PWM pulse having the determined pulse width is output to the motor driver 54. This modifies the spin speed of Spindlemo 50.
  • step S77 when proceeding to step S77 to perform FCM control, first, in this step, a frequency-divided pulse is fetched from PWC 38d, and the period of the FCM pulse is detected based on this frequency-divided pulse. I do. In a succeeding step S.778, a deviation between the target FCM cycle and the detected FCM cycle is determined.
  • the target FCM cycle is always constant (18E6H in hexadecimal notation), and the deviation is calculated by subtracting the FCM cycle detected in step S77 from such a target FCM cycle.
  • step S79 The obtained deviation is compared with a predetermined threshold in step S79. If the absolute value of the deviation is larger than a predetermined threshold value, it is determined that an emergency condition has occurred.
  • step S80 the servos such as the tracking servo and the focus servo are turned off.
  • step S81 the laser is turned off. Turn off the power and stop the device.
  • step S79 If the absolute value of the deviation is smaller than the predetermined threshold value in step S79, a PWM pulse width for eliminating the deviation obtained in step S78 is obtained in step S82, and the subsequent step S8 In step 3, a PWM pulse having the determined pulse width is output to the driver 54. As a result, the rotation speed of the spindle motor 50 is corrected.
  • step S85 and S87 the tracking control flag And the state of the tracking loss flag is determined. And, even if the tracking control flag is in the reset state (tracking servo interrupted) or the tracking control flag is in the set state (tracking servo execution), the tracking loss flag is set (TE signal maximum level ⁇ threshold value). ), It is considered that FCM control is impossible, and the FG flag is set in step S89. In other words, it requests a transition from FCM control to FG control. On the other hand, if the tracking control flag is set (tracking servo execution) and the tracking loss flag is reset (TE signal maximum level> threshold), it is considered that FCM control is possible. In step S91, the FG flag is reset. In other words, it requests a transition from FG control to FCM control. When the processing in step S89 or S91 is completed, the routine returns.
  • the FCM is formed at a predetermined distance on the track of the recording surface of the magneto-optical disk 48.
  • the optical pickup 12 irradiates the recording surface of such a magneto-optical disk 48 with laser light.
  • the FCM signal is detected by irradiating the laser light.
  • ASM ⁇ is used as the magneto-optical disk.
  • a plurality of areas having mutually different optimum rotational speeds are allocated to the recording surface, and predetermined marks are formed on the track at predetermined intervals.
  • predetermined marks are formed on the track at predetermined intervals.
  • ASMO ASMO.
  • the rotation speed of the spindle motor is controlled based on the FCM signal.
  • an address mark other than the FCM is provided on the track. Embosses are formed at predetermined intervals, and an address mark signal related to this address mark can be detected. Therefore, the present invention may be controlled based on an address mark signal instead of the FCM signal.

Abstract

L'invention concerne une unité de disque dans laquelle un support d'enregistrement sur disque présentant des repères spécifiés formés sur la piste selon un espacement spécifié, est mis en rotation par un moteur à axe et la piste est irradiée par une lumière laser au moyen d'un laser à semi-conducteur. Un moyen de détection de signal détecte un signal se rapportant au repère spécifié, en fonction de la lumière réfléchie par la piste, la période dudit signal est détectée et l'alimentation du laser à semi-conducteur est interrompue si la différence entre la période détectée et une période de référence est supérieure à une valeur spécifiée. Dans un enregistreur/lecteur soumis à une commande à vitesse linéaire constante CLV, la décision de commande de rotation d'un disque est prise rapidement correctement ou sans tenir compte de la position radiale d'un lecteur, de sorte que les données soient protégées en cas d'urgence lorsque le débit en ligne est faible.
PCT/JP2002/000615 2001-01-31 2002-01-28 Unite de disque WO2002061738A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001023063A JP2002230755A (ja) 2001-01-31 2001-01-31 ディスク装置
JP2001-23063 2001-01-31

Publications (1)

Publication Number Publication Date
WO2002061738A1 true WO2002061738A1 (fr) 2002-08-08

Family

ID=18888392

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2002/000615 WO2002061738A1 (fr) 2001-01-31 2002-01-28 Unite de disque

Country Status (2)

Country Link
JP (1) JP2002230755A (fr)
WO (1) WO2002061738A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5267302A (en) * 1975-12-01 1977-06-03 Matsushita Electric Ind Co Ltd Optical recording and reproduction device
JPS5968843A (ja) * 1982-10-13 1984-04-18 Canon Inc 光学的情報再生装置
JPS5984355A (ja) * 1982-11-08 1984-05-16 Hitachi Ltd 光デイスク装置
JPS60201533A (ja) * 1984-03-24 1985-10-12 Sony Corp 光学式ディスク再生装置
JPH10228722A (ja) * 1997-02-18 1998-08-25 Sony Corp ディスクドライブ装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5267302A (en) * 1975-12-01 1977-06-03 Matsushita Electric Ind Co Ltd Optical recording and reproduction device
JPS5968843A (ja) * 1982-10-13 1984-04-18 Canon Inc 光学的情報再生装置
JPS5984355A (ja) * 1982-11-08 1984-05-16 Hitachi Ltd 光デイスク装置
JPS60201533A (ja) * 1984-03-24 1985-10-12 Sony Corp 光学式ディスク再生装置
JPH10228722A (ja) * 1997-02-18 1998-08-25 Sony Corp ディスクドライブ装置

Also Published As

Publication number Publication date
JP2002230755A (ja) 2002-08-16

Similar Documents

Publication Publication Date Title
JP2655109B2 (ja) 光ディスク装置
US6195321B1 (en) Disk rotation control apparatus with deceleration means
JP3020747B2 (ja) 光学的情報記録再生装置
JP2007149209A (ja) 光ディスク装置及び情報記録再生方法
KR100484455B1 (ko) 광디스크 장치의 디스크 크기 판별방법
KR100331336B1 (ko) Ｄｃ 스핀들 모터 속도 검출장치 및 방법
JP2002245642A (ja) トラックジャンプ制御装置およびトラックジャンプ方法
WO2002061738A1 (fr) Unite de disque
JPH073691B2 (ja) 円板状記録担体読取装置
JPH10302384A (ja) ディスクドライブ装置
JP4963593B2 (ja) 光ディスク装置、トラッキング制御開始方法及びトラッキング制御開始プログラム
US6973013B2 (en) Track jump apparatus capable of varying moving pulse and braking pulse
KR100320469B1 (ko) 광 디스크 기록 재생 제어 방법 및 장치
JP3867962B2 (ja) 記録条件決定プログラム及び記録媒体、記録条件決定方法並びに情報記録装置
KR20010059876A (ko) 광 기록재생기의 제어 방법
JP2002117615A (ja) ディスク装置
JPH05274773A (ja) Ｃｄプレーヤにおける目標トラックアクセス方式
JP4353771B2 (ja) スピンドルモータの等線速度制御方法及び制御装置
JPH0877688A (ja) 光ディスク再生装置
JP3801483B2 (ja) ディスク駆動装置の制御装置
JPH10199114A (ja) Ｚｃｌｖ方式ディスク状記録媒体の記録／再生装置
US20040196750A1 (en) Method of braking control in rapid track seeking for an optical drive
JP2001034942A (ja) ディスク記録装置
JPH11134776A (ja) ディスク再生装置、データ再生方法
JPH09259518A (ja) ディスク回転制御装置

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CN KR US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): DE FR GB

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
122 Ep: pct application non-entry in european phase