WO2010074533A2 - Procédé de commande de vitesse d'accès, appareil d'enregistrement/lecture et procédé d'enregistrement/lecture - Google Patents

Procédé de commande de vitesse d'accès, appareil d'enregistrement/lecture et procédé d'enregistrement/lecture Download PDF

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Publication number
WO2010074533A2
WO2010074533A2 PCT/KR2009/007781 KR2009007781W WO2010074533A2 WO 2010074533 A2 WO2010074533 A2 WO 2010074533A2 KR 2009007781 W KR2009007781 W KR 2009007781W WO 2010074533 A2 WO2010074533 A2 WO 2010074533A2
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WIPO (PCT)
Prior art keywords
recording medium
reproduction signal
recording
pickup unit
signal
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PCT/KR2009/007781
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English (en)
Korean (ko)
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WO2010074533A3 (fr
Inventor
이재성
곽봉식
서정교
이성훈
Original Assignee
엘지전자 주식회사
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Publication of WO2010074533A2 publication Critical patent/WO2010074533A2/fr
Publication of WO2010074533A3 publication Critical patent/WO2010074533A3/fr

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
    • G11B7/08511—Methods for track change, selection or preliminary positioning by moving the head with focus pull-in only
    • 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
    • G11B7/121—Protecting the head, e.g. against dust or impact with the record carrier
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
    • G11B7/08529—Methods and circuits to control the velocity of the head as it traverses the tracks

Definitions

  • the present invention relates to a method for controlling access speed, a recording / reproducing apparatus and a recording / reproducing method, and more particularly, to a method for controlling access speed between a pickup unit and a recording medium, and a recording / reproducing apparatus and a recording / reproducing method using the same. .
  • Such recording media include compact discs (CDs), digital versatile discs (DVDs), and the like.
  • BD Blu-ray Disc
  • NFR Near Field Recording
  • the next generation recording media described above use a light source with a shorter wavelength and an optical system having a high numerical aperture to increase the capacity.
  • a more precise control system is required, and research and development for this purpose are being conducted.
  • Such a recording / reproducing apparatus for recording / reproducing a next-generation recording medium employs various means to secure stability when recording and reproducing data on the recording medium.
  • An object of the present invention is to provide a method and apparatus capable of stably recording / reproducing data.
  • Another object of the present invention is to provide a method and apparatus for stably recording / reproducing data by controlling an interval speed between a pickup unit and a recording medium.
  • Another object of the present invention is to provide a method and apparatus for reducing an error rate during recording / reproducing by preventing a collision between a pickup unit and a recording medium.
  • the present invention provides a recording / reproducing apparatus including a pickup unit that receives light reflected or diffracted by irradiating light onto a recording medium, wherein the recording / reproducing apparatus records and reproduces data using the received light. It provides a method of controlling the access speed comprising the step of generating a signal, checking the generated reproduction signal value, and adjusting the speed of the pickup unit approaches the recording medium when the reproduction signal value exceeds the reference value.
  • the access speed control method further comprises the step of recognizing that the pickup portion and the recording medium has approached a predetermined distance.
  • the reference value provides a approach speed control method corresponding to a value of 20 mV to 25 mV.
  • the present invention provides a recording / reproducing apparatus including a pickup unit which receives light reflected or diffracted by irradiating light onto a recording medium to record and reproduce data using the received light. And a step of generating a reproduction signal, determining a variation of the reproduction signal, and adjusting a speed at which the pickup unit approaches the recording medium according to the determination result of the variation of the reproduction signal.
  • the fluctuation range of the reproduction signal provides an approach speed control method corresponding to the difference between the maximum value and the minimum value of the reproduction signal for a predetermined time.
  • the reference value provides a approach speed control method corresponding to a value of 20 mV to 25 mV.
  • the present invention provides a pickup unit for irradiating light to a recording medium, receiving light reflected or diffracted from the recording medium and outputting a signal, and recording and reproducing data using the output signal.
  • a recording / reproducing apparatus including a signal generation unit for generating a reproduction signal for the reproduction signal and a control unit for checking the generated reproduction signal value and controlling the pickup unit to adjust a speed of approaching the recording medium when the reproduction signal value exceeds the reference value.
  • the present invention provides a pickup unit for irradiating light to a recording medium, receiving light reflected or diffracted from the recording medium and outputting a signal, and recording and reproducing data using the output signal. It provides a recording / reproducing apparatus including a signal generating unit for generating a reproduction signal for the control and a control unit for determining the fluctuation range of the reproduction signal, and controls the pickup unit to adjust the speed of access to the recording medium in accordance with the determination result of the reproduction signal.
  • the controller also provides a recording or reproducing apparatus for controlling the pickup unit to maintain the same speed of approaching the recording medium when the fluctuation range of the reproduction signal has a value equal to or less than the reference value.
  • control unit provides a recording or reproducing apparatus that controls the speed at which the pickup unit approaches the recording medium when the fluctuation range of the reproduction signal exceeds the reference value based on the time when the fluctuation range of the reproduction signal exceeds the reference value.
  • a reference value provides a recording or reproducing apparatus corresponding to a value of 20 mV to 25 mV.
  • the present invention provides a method of recording / reproducing data on a recording medium, comprising: accessing a pickup unit to a recording medium; detecting a playback signal from the recording medium; When it satisfies the present invention, a recording / reproducing method of driving a gap servo is provided.
  • the specific condition of the reproduction signal provides a recording or reproducing method indicating that the pickup section is close to the recording medium.
  • the specific condition of the reproduction signal provides a recording or reproducing method of approaching the pickup unit to a recording medium in a stationary state and detecting and obtaining the moment when the reproduction signal is generated.
  • FIG. 1 is a block diagram showing a configuration of a recording / reproducing apparatus according to an embodiment of the present invention.
  • FIG. 2 shows a pickup section of a recording / playback apparatus according to an embodiment of the present invention.
  • FIG. 3 shows a change in the RF signal value when the pickup unit in the recording / reproducing apparatus approaches the recording medium according to an embodiment of the present invention.
  • FIG 4 shows an experimental value of an RF signal value when the pickup unit in the recording / reproducing apparatus approaches the recording medium according to another embodiment of the present invention.
  • FIG. 5 illustrates a relationship between a pickup unit and a recording medium according to an embodiment of the present invention.
  • FIG. 6 is a flowchart showing a recording / reproducing method according to an embodiment of the present invention.
  • FIG. 7 illustrates a change in approach speed of a pickup unit and a recording medium according to a change in a reproduction signal value according to an embodiment of the present invention.
  • FIG. 8 is a flowchart showing a recording / reproducing method according to another embodiment of the present invention.
  • FIG. 9 is a flowchart showing a recording / reproducing method according to another embodiment of the present invention.
  • FIG. 10 illustrates changes in gap error signal and reproduction signal values during gap servo driving according to an embodiment of the present invention.
  • the present invention provides a recording / reproducing apparatus which includes a pickup unit for receiving light reflected or diffracted by irradiating light onto a recording medium, the method comprising: generating a reproduction signal for recording and reproducing data by using the received light; It provides a method of controlling the speed of access including the step of checking the value of the playback signal and adjusting the speed at which the pickup unit approaches the recording medium when the value of the playback signal exceeds the reference value.
  • the present invention provides a recording / reproducing apparatus including a pickup unit which receives light reflected or diffracted by irradiating light onto a recording medium to record and reproduce data using the received light. And a step of generating a reproduction signal, determining a variation of the reproduction signal, and adjusting a speed at which the pickup unit approaches the recording medium according to the determination result of the variation of the reproduction signal.
  • the present invention provides a pickup unit for irradiating light to a recording medium, receiving light reflected or diffracted from the recording medium and outputting a signal, and recording and reproducing data using the output signal.
  • a recording / reproducing apparatus including a signal generation unit for generating a reproduction signal for the reproduction signal and a control unit for checking the generated reproduction signal value and controlling the pickup unit to adjust a speed of approaching the recording medium when the reproduction signal value exceeds the reference value.
  • the present invention provides a pickup unit for irradiating light to a recording medium, receiving light reflected or diffracted from the recording medium and outputting a signal, and recording and reproducing data using the output signal. It provides a recording / reproducing apparatus including a signal generating unit for generating a reproduction signal for the control and a control unit for determining the fluctuation range of the reproduction signal, and controls the pickup unit to adjust the speed of access to the recording medium in accordance with the determination result of the reproduction signal.
  • the present invention provides a method of recording / reproducing data on a recording medium, comprising: accessing a pickup unit to a recording medium; detecting a playback signal from the recording medium; When it satisfies the above, it provides a recording / reproducing method for driving the gap servo.
  • the recording medium means any medium in which data is recorded or can be recorded, and includes all media regardless of a recording method such as a disk and a magnetic tape.
  • a recording method such as a disk and a magnetic tape.
  • the present invention will be described using a disk, in particular, a near field recording medium as a recording medium for convenience of explanation, but it will be apparent that the technical concept of the present invention is equally applicable to other recording media.
  • the recording and reproducing apparatus is meant to encompass the recording and reproducing apparatus and the apparatus capable of both recording and reproducing, and it is obvious that the recording and reproducing apparatus can be used as a term of the recording / reproducing apparatus.
  • the recording and reproducing method is meant to encompass the recording method, the reproducing method, and the method capable of both recording and reproducing.
  • FIG. 1 is a block diagram showing a configuration of a recording / reproducing apparatus according to an embodiment of the present invention.
  • the recording / reproducing apparatus includes a pickup unit 10, a controller 50, and a signal generator 30.
  • the recording / reproducing apparatus may include a servo unit 80 including a spindle servo 70 and a gap servo 40, a sled motor 20, a spindle motor 60, and a host (not shown). .
  • the pickup unit 10 irradiates light to the recording medium, and collects light reflected or diffracted from the recording medium to generate an electrical signal.
  • Position control of the pickup section 10 is essential for accurate recording or reproduction of the recording medium. If the position between the recording medium and the pickup section 10 is not accurately controlled, it is also difficult to read accurate information from the recording medium and to record accurate information. For this reason, accurate position signal information for position control between the pickup section 10 and the recording medium is required.
  • the signal generator 30 may generate a reproduction signal (RF signal), a gap error signal (GES), a tracking error signal (TES), and the like by using the electrical signal generated by the pickup unit 10.
  • RF signal reproduction signal
  • GES gap error signal
  • TES tracking error signal
  • create The reproducing signal is a signal related to recording and reproducing data
  • the gap error signal is a signal representing a vertical distance between the recording medium 100 and the pickup unit 10
  • the tracking error signal is a recording medium 100 and the pickup unit 10. This signal indicates the position on the track of the liver.
  • the gap servo 40 drives an actuator (not shown) based on the gap error signal GES to adjust the gap 100 between the pickup unit 10 and the recording medium.
  • the spindle servo 70 drives the spindle motor 60 to rotate the recording medium 100 based on the reproduction signal (RF signal).
  • the sled motor 20 is driven by a sled servo (not shown) and moves the pickup section 10 in the radial direction.
  • the controller 50 receives the signals generated by the signal generator 30, analyzes and determines the signals, and controls each component of the recording / reproducing apparatus. For example, the controller 50 may control the approach speed between the pickup unit 10 and the recording medium 100 by using a reproduction signal (RF signal).
  • RF signal reproduction signal
  • the controller 50 checks or judges whether a received RF signal value exceeds a reference value, and controls the speed of the pickup unit 10 to slow down when the reference value is exceeded or determined. can do.
  • the controller 50 may calculate the fluctuation range of the received reproduction signal (RF signal), and may control to slow down the approach speed when the fluctuation range exceeds the reference value.
  • the fluctuation range of the reproduction signal can be expressed as the difference between the maximum value and the minimum value of the reproduction signal in unit time. The unit time can converge to zero.
  • the reference value corresponds to 20 mV to 25 mV.
  • FIG. 2 shows a pickup section 10 of the recording / playback apparatus according to an embodiment of the present invention. 2 will be described in detail with reference to the flow of signals based on the traveling direction of the light emitted from the light source inside the pickup unit 10.
  • Pick-up unit 10 is a light source 110, the first separation unit 120, the second separation unit 130, the lens unit 140, the first light receiving unit 170 and the second light receiving unit ( 180).
  • the pickup unit 10 according to the present invention may include a collimator lens 115.
  • the collimator lens 115 serves to convert incident light into parallel light.
  • the light emitted from the light source 110 is incident on the first separation synthesis unit 120, partly reflected and partly passed through and incident on the second separation synthesis unit 130.
  • the second separation synthesis unit 130 passes the vertical polarization component and reflects the horizontal polarization component in the linearly polarized light.
  • a non-polarized beam splitter NBS
  • the roles of the first separation synthesis unit 120 and the second separation synthesis unit 130 may be changed.
  • a polarization conversion surface (not shown) may be included on the path of the light passing through the second separation synthesis unit 130.
  • Light passing through the second separating synthesis unit 130 is incident to the lens unit 140.
  • Light incident on the objective lens 55 of the lens unit 140 passes through the near field forming lens 65 to form a dissipated wave.
  • light incident on the near field forming lens 65 at an angle greater than or equal to a critical angle is totally reflected on the surface of the lens 65 and the surface of the recording medium 100.
  • Light incident on the near field forming lens 65 at an angle equal to or less than the critical angle is reflected on the recording layer 75 of the recording medium.
  • the dissipation wave generated in this process reaches the recording layer 75 of the recording medium to perform recording and reproduction.
  • the light reflected from the recording medium 100 is incident to the second separation synthesis unit 130 through the lens unit 140 again.
  • the polarization conversion surface may be provided on a path incident to the second separation synthesis unit 130.
  • the polarization converting surface converts the polarization direction of the light incident on the recording medium and the reflected light. Accordingly, the light incident only by passing the horizontal polarization component by the second separation synthesis unit 130 has the vertical polarization component when it is reflected on the recording medium and is incident on the second separation synthesis unit 130 again. Therefore, the reflected light of the vertical polarization component is reflected by the second separation synthesis unit 130, and the reflected light is incident on the second light receiving unit 180.
  • a portion of the reflected light incident on the second separation synthesis unit 130 has a horizontal polarization component due to the distortion in the polarization direction, and passes through the second separation synthesis unit 130.
  • the reflected light passes through the first separation synthesis unit 120.
  • the first separation synthesis unit 120 passes a portion of the incident light and reflects the portion.
  • the light reflected by the first separating synthesis unit 120 is incident to the first light receiving unit 170.
  • the light receiving units 170 and 180 receive the amount of light passing through the separation and synthesis units 120 and 130 and output an electric signal corresponding to the amount of light.
  • the light receivers 170 and 180 are configured in multiple division areas.
  • the light receiving units 170 and 180 may be composed of two photodetecting elements (PDA, PDB) that are divided in a specific division, for example, two divisions in a signal track direction or a radial direction of the recording medium 100.
  • each of the photodetectors PDA and PDB generates electrical signals a and b proportional to the amount of light received.
  • the light receiving units 170 and 180 may be configured with four photodetectors (PDA, PDB, PDC, PDD) divided into four in the signal track direction and the radial direction of the recording medium 100.
  • the photodetecting elements constituting the light receiving units 170 and 180 are not limited to this embodiment, and various modifications and selections may be made as necessary.
  • the four photodetectors constituting the aforementioned first light receiver 170 output electrical signals a, b, c, and d corresponding to the amount of light received.
  • the reproduction signal (RF signal) is generated by adding all the signals output from the light detecting element constituting the second light receiving unit 180.
  • the reproduction signal (RF signal) generated as described above is expressed as follows.
  • the reproduction signal corresponds to the sum of the electrical signals corresponding to the amount of light, and thus is proportional to the amount of reflected light received by the first light receiving unit 170.
  • FIG 3 shows a change in the value of a reproduction signal (RF signal) when the pickup unit 10 in the recording / reproducing apparatus approaches the recording medium 100.
  • the reproduction signal value maintains a constant value. As the distance is approached further, a point where the reproduction signal changes is temporarily generated. Passing this point keeps the previous constant value again. After that, when the distance between the pickup unit 10 and the recording medium 100 is reduced to some extent, the reproduction signal value increases while drawing an exponential curve.
  • the pattern of the change graph of the reproduction signal as shown in FIG. 3 will be described in detail with reference to FIG. 5.
  • the section A corresponds to a section representing a value of a reproduction signal that is constant at a time before time 0, and the section B corresponds to a region having a peak value instantaneously as a section having time zero.
  • the intervals C and D correspond to the interval after time zero.
  • the value of the reproduction signal having the initial peak value corresponds to 30 mV.
  • FIG 5 illustrates a relationship between the pickup unit 10 and the recording medium 100 according to an embodiment of the present invention.
  • the light passing through the objective lens 55 included in the pickup section 10 passes through the near-field forming lens 65 and passes through the focus. Such light at the focus may be used to record and reproduce data.
  • the position of the focal point can be variously adjusted according to the characteristics of the objective lens 55.
  • the RF signal is a signal value based on light reflected or diffracted on the recording medium during recording / reproducing of data. For example, the sum of the amounts of light reflected or diffracted on the recording medium and received by the pickup section 10 can be considered simply.
  • the pick-up section 10 continues to move, the focus of the light moves inside the recording medium.
  • this section that is, section C
  • the light is absorbed along the recording medium or passes through the same medium. It has the same reproduction signal value.
  • This section is an area where the playback signal temporarily increases.
  • the pickup unit 10 is brought closer to the recording medium, the focus of the light comes into contact with the recording layer, and this section is the D section, where the value of the reproduction signal increases rapidly due to the light reflected or diffracted by the recording layer of the recording medium. Corresponds to the section.
  • the recording / reproducing method receives the reflected or diffracted light from the recording medium 100, generating a reproduction signal for recording and reproducing data, and determining whether the reference value of the generated reproduction signal is exceeded. And adjusting the speed at which the pickup unit 10 approaches the recording medium 100 when the reproduction signal exceeds the reference value. Specifically, when the recording medium 100 is loaded into the recording / reproducing apparatus (S10), the pickup unit 10 of the recording / reproducing apparatus irradiates light to the recording medium 10, and the irradiated light is recorded onto the recording medium 100.
  • the light receiver in the pickup unit 10 When the light is reflected or diffracted by the light source, the light receiver in the pickup unit 10 generates an electrical signal (S20).
  • the signal generator 30 generates a reproduction signal (RF signal) using the electric signal (S30).
  • the controller 50 receives the playback signal in real time, and approaches the pickup unit 10 to the recording medium 100 for recording and reproducing the data (S40). At this time, it is possible to bring the pickup unit 10 close to the recording medium 100 at a high speed. Normally, the pickup unit 10 can be approached about 30% faster than the speed of approaching the recording medium 100, and the range is obvious. If the control unit 50 determines that the value of the reproduction signal received in real time exceeds the reference value, the control unit 50 controls the pickup unit 10 to slow down the speed of approaching the recording medium 100 (S50).
  • the reference value of the reproduction signal may correspond to a value of an error range of the reproduction signal. Of course, those skilled in the art will be free to select the setting regarding the error range. Also, preferably, the reference value may have a value of 20 to 25 mV.
  • the controller 50 may recognize the first time when the value of the reproduction signal exceeds the reference value as the pickup unit 10 and the recording medium 100 approach a predetermined distance. In addition, the controller 50 may slow down the approach speed whenever the value of the reproduction signal exceeds the reference value. At this time, it is possible to set the deceleration rate of the approaching speed. For example, a method of reducing the approach speed to 50% of the previous speed may be possible every time the value of the reproduction signal is changed to a reference value or more. Of course, the reduction ratio of the approach speed will be variously selected by those skilled in the art.
  • the pickup unit 10 approaches the recording medium 100 to a specific position by using various signals such as a gap error signal GES, recording or reproducing of data is started (S60).
  • FIG. 7 illustrates a change in approach speed of the pickup unit 10 and the recording medium 100 according to a change in the reproduction signal value according to an embodiment of the present invention.
  • the pickup section 10 approaches the recording medium 100 at a speed of V1. If the control unit 50 determines that the reproduction signal value exceeds the reference value, the speed is reduced to V2, and it is possible to recognize that the pickup unit 10 and the recording medium 100 have approached a predetermined distance at this point. have.
  • This may correspond to a section B in FIG. 3 and a time point when time is zero in FIG. 4.
  • the reference value corresponds to 20 to 25 mV.
  • FIG. 8 is a flowchart showing a recording / reproducing method according to another embodiment of the present invention.
  • the pickup unit 10 of the recording / reproducing apparatus irradiates light onto the recording medium 100, and the irradiated light is reflected or reflected on the recording medium 100.
  • the electric signal is generated by the light receiving unit in the pickup unit 10 (S25).
  • the signal generator 30 generates a reproduction signal (RF signal) using the electric signal (S35).
  • the controller 50 receives the playback signal in real time, calculates and determines a variation of the playback signal, and approaches the pickup unit 10 to the recording medium 100 for recording and reproducing the data (S45).
  • the fluctuation range of the reproduction signal is set to the difference value between the maximum value and the minimum value of the reproduction signal during the unit time.
  • the unit time may correspond to a value that converges to zero.
  • the controller 50 checks whether the fluctuation range of the reproduction signal exceeds the reference value in real time (S55). If the variation range of the reproduction signal is equal to or less than the reference value, the controller 50 maintains the access speeds of the pickup unit 10 and the recording medium 100 to be the same (S65).
  • the reference value preferably corresponds to 20 mV to 25 mV. However, setting the reference value in various ways is within the scope apparent to those skilled in the art.
  • the controller 50 controls the approach speed to be decelerated every time the fluctuation range exceeds the reference value (S75). At this time, it is also possible to set the ratio of the approach speed. That is, it is possible to decelerate to 50% of the previous speed every time the change rate fluctuates. On the other hand, the deceleration rate of the approach speed may be variously selected by those skilled in the art. If it is recognized that the pickup unit 10 has approached the recording medium 100 to a specific position by using various signals such as a gap error signal (GES) (S85), the movement of the pickup unit 10 is stopped, and data is recorded. Or playback starts (S95).
  • GES gap error signal
  • FIG 9 shows a recording / reproducing method according to another embodiment of the present invention.
  • a specific condition of the reproduction signal (RF signal) for the recording medium is obtained (S100).
  • the specific condition of the reproduction signal may be obtained by approaching the pickup unit 10 to the recording medium in a stationary state and identifying the moment when the reproduction signal is generated. Since the reproduction signal may be different from the instant when the reproduction signal is generated and the characteristics of the reproduction signal to be described later according to the type of the recording medium, a specific condition of the reproduction signal can be newly obtained for each recording medium. Then, the pickup unit 10 is approached to the recording medium (S110). In addition, when a reproduction signal emitted from the recording medium is received, the reproduction signal satisfying the specific condition may be detected when the pickup is close enough to contact the recording medium (S120).
  • the specific condition of the reproduction signal can be obtained from the slope and magnitude of the reproduction signal. That is, as shown in FIG. 10, when the pickup unit 10 approaches the recording medium, a reproduction signal is generated at a specific point, and this is when the pickup unit approaches the recording medium beyond the threshold value.
  • the pickup section 10 should be controlled so that 10) no longer approaches the record carrier above the threshold.
  • the point where the pickup unit 10 actually collides with the recording medium may be set as a threshold.
  • the specific condition of the reproduction signal is first obtained in step S100, the recording medium and the pickup unit 10 Collision with is inevitable.
  • the control may be controlled through the servo driving of the pickup unit only when it is detected by being reflected at a specific inclination or a specific magnitude or more. That is, after measuring the highest point of the magnitude of the reproduction signal in Fig. 10, it can be set to a specific condition, and the change in the slope of the reproduction signal can be measured to set it to a specific condition.
  • the playback signal since the playback signal is generated and increases and then the increase stops, the playback signal is the maximum. Therefore, it may be detected as a collision point between the pickup unit 10 and the recording medium. Next, it is determined whether or not the recording medium is rotated (S130).
  • the operation of bringing the pickup unit 10 closer to the recording medium is repeated (S120). . If the recording medium is rotated (Yes), it is a step of reading data from the recording medium or storing the data on the recording medium. Gap servo driving is performed (S140).
  • the above-described method is a method of driving a gap servo in a section in which a gap error signal appearing when approaching a near field region is linear. That is, the gap error signal appears at a constant value when the pickup unit 10 approaches the recording medium. In FIG. 10, before the gap servo is applied, the gap error signal has a value of about 3.5 V.
  • the gap error signal When the pickup unit 10 contacts the recording medium, the gap error signal has a value of about 0 volts (V). Then, when the above-described gap error signal has a value of about 0 volts, i.e., just before the pickup and the recording medium come into contact, a reproduction signal is generated.
  • V 0 volts
  • gap servo driving can be performed at the moment when the gap servo signal satisfies a predetermined value.
  • the interval servo is too small and the gap servo signal may be unstable depending on the alignment of the pickup section 10 and the recording medium.
  • the reproduction signal since the reproduction signal has a more stable characteristic than the gap error signal, it can be used as a synchronization signal for applying a gap servo by using the characteristic of the reproduction signal at the moment of contact between the pickup and the recording medium. That is, the above-described method of recording and / or reproducing data can detect the change in the reproduction signal reflected from the recording medium and drive the pickup server.
  • the playback signal can be used for securing stability and preventing errors.

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  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

La présente invention concerne un appareil d'enregistrement/lecture comprenant une partie de capture qui émet de la lumière sur un support d'enregistrement afin de recevoir une lumière réfléchie ou diffractée, ainsi qu'un procédé de commande de vitesse d'accès qui consiste à utiliser la lumière reçue afin d'enregistrer des données et de générer des signaux de lecture, à vérifier les valeurs des signaux de lecture générés puis, si la valeur du signal de lecture dépasse une valeur de référence, à ajuster la vitesse à laquelle la partie de capture accède au support d'enregistrement.
PCT/KR2009/007781 2008-12-26 2009-12-24 Procédé de commande de vitesse d'accès, appareil d'enregistrement/lecture et procédé d'enregistrement/lecture WO2010074533A2 (fr)

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KR20080134224 2008-12-26
KR10-2008-0134224 2008-12-26
KR20090024511 2009-03-23
KR10-2009-0024511 2009-03-23

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WO2010074533A2 true WO2010074533A2 (fr) 2010-07-01
WO2010074533A3 WO2010074533A3 (fr) 2010-09-16

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Citations (5)

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