WO2001037270A1 - Support d'enregistrement de type disque et appareil d'enregistrement/de reproduction optique comprenant ledit support - Google Patents

Support d'enregistrement de type disque et appareil d'enregistrement/de reproduction optique comprenant ledit support Download PDF

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Publication number
WO2001037270A1
WO2001037270A1 PCT/JP2000/008062 JP0008062W WO0137270A1 WO 2001037270 A1 WO2001037270 A1 WO 2001037270A1 JP 0008062 W JP0008062 W JP 0008062W WO 0137270 A1 WO0137270 A1 WO 0137270A1
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WO
WIPO (PCT)
Prior art keywords
light beam
pit
record carrier
pits
signal
Prior art date
Application number
PCT/JP2000/008062
Other languages
English (en)
Japanese (ja)
Inventor
Masayoshi Shioya
Yasumori Hino
Kazumasa Hirano
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Publication of WO2001037270A1 publication Critical patent/WO2001037270A1/fr

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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
    • G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
    • G11B7/00745—Sectoring or header formats within a track
    • 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
    • G11B7/0908—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 for focusing only

Definitions

  • the present invention relates to a disc-shaped record carrier on which information is recorded by a light source such as a laser and / or from which the recorded information is reproduced, and an optical disc for recording information on the record carrier and reproducing the recorded information.
  • the present invention relates to a type recording / reproducing apparatus. Background art
  • a disc-shaped record carrier that rotates at a predetermined number of revolutions is converged and irradiated with a light beam generated from a semiconductor laser mounted on an optical pickup using an objective lens or the like, and the information recorded on the record carrier is Optical reproducing devices for reproducing are known.
  • a record carrier used in such an optical reproducing apparatus has a surface run of soil 100 / m to soil 200im due to a warp caused by the record carrier itself, a tilt caused by the device, and the like.
  • the depth of focus of the objective lens that converges the light beam on the record carrier is narrower than 1 m, the light beam output from the optical pickup must be focused properly on the record carrier.
  • a focus error signal indicating the convergence state of the light beam on the record carrier is detected, and the objective lens is driven in the direction of moving toward and away from the record carrier in accordance with the focus error signal.
  • a focus control system is needed to maintain the beam (ie, to make the light beam properly converge on the record carrier).
  • the above-mentioned record carrier is provided with a fine pit row (track) having a pitch of 0.74 to 1.6 m in a spiral shape. Reproduction of the signal recorded thereon is performed by receiving reflected light from the record carrier with a photodetector while performing tracking control so that the light beam is always positioned on a pit row (track).
  • the focus error signal is also obtained from the reflected light from the record carrier.
  • the astigmatism method is often used.
  • a photodetector divided into four by two orthogonal straight lines is installed at a position where the cross section of the reflected light of the astigmatic optical system becomes circular when the record carrier is at the focal position of the objective lens.
  • the force error signal (FE) can be detected by combining the four detection signals A, B, C, and D obtained from the four divided photodetectors by an arithmetic circuit or the like.
  • a and B and C and D are detection signals output from the cells of the photodetector located at diagonal positions.
  • the beam cross section on the photodetector divided into four parts becomes a long circle in the diagonal direction orthogonal to the major axis direction of the above-mentioned ellipse.
  • the focus error signal (FE) described above is caused by the position deviation of the optical detector, the variation in the sensitivity of each photodetector divided into four, and the variation in the amplification factor of the amplifier that amplifies the signal output from each photodetector.
  • the convergence state of the light beam on the record carrier may not be optimal even if becomes zero.
  • a bias (offset) voltage is applied to the focus error signal to change the convergence state of the light beam, and adjustment is performed so that the jitter of the reproduced signal is optimized.
  • the bias voltage is adjusted by the following procedures (1) to (4) (see Japanese Patent Application Laid-Open No. 8-77579).
  • Focus control is performed on the objective lens with respect to the record carrier, and tracking control is performed so that the light beam spot by the objective lens is always positioned in the pit row on the record carrier.
  • V (V 1 + V 2) 2 from the stored VI and V 2, and apply this value V to the focus control system as the optimal bias voltage value.
  • the adjustment requires that information for measuring the error rate be recorded on the record carrier in advance. That is, in the case of an unused recording / reproducing record carrier, there is a problem that the bias voltage cannot be adjusted because no information is recorded on the record carrier. In addition, when trying to perform the above-described bias voltage adjustment on an unused recording / reproducing record carrier, it is necessary to provide a special area on the record carrier and perform information recording in advance, and then adjust the bias voltage. There is a problem that the start-up time of the device increases.
  • the method using the error rate of the reproduction signal requires an error rate measurement system that is not used in the normal operation of the optical recording / reproducing apparatus, and has a problem that the apparatus becomes complicated and expensive. Disclosure of the invention
  • the present invention has been made in view of the above points, and it is unnecessary to previously record information for adjusting a bias voltage, thereby shortening a start-up time of an apparatus, and a circuit for measuring an error rate of a reproduced signal. It is an object of the present invention to provide a disc-shaped record carrier and an optical recording / reproducing apparatus which can optimize a convergence state of a light beam without using the same.
  • the present invention has the following configuration.
  • the disc-shaped record carrier of the present invention is a disc-shaped record carrier that is arranged radially along the center line of a pit force concentric or spiral virtual track, wherein The width of the pit in the radial direction is set to a predetermined ratio with respect to a spot size of a light beam for recording information on the record carrier or reproducing the recorded information.
  • the interval or width in the radial direction of the pit is set to a predetermined ratio with respect to the spot size of the light beam, when the light beam passes over the pit and when the light beam passes through the pit When passing between the ports, the signal amplitude detected from the pit can be made substantially equal.
  • the convergence state of the light beam is optimized by operating the focus control system without operating the tracking control system.
  • a radial width of the pit is 0.5 times or more of a spot size of the light beam. According to such a configuration, it is possible to always secure a signal amplitude of 85% or more of the maximum detectable signal amplitude based on the pit.
  • the interval between the pits in the radial direction is 1.4 times or less the spot size of the light beam.
  • the distance between the clock pits in the radial direction is set to 1.4 times or less of the spot size of the light beam, the light beam will pass through between the clock pits. It is possible to obtain a signal amplitude of 90% or more of the signal amplitude based on the pit obtained when the beam passes over the clock pit.
  • the optical recording / reproducing apparatus of the present invention provides a light converging device that converges a light beam on a disc-shaped record carrier on which pits are arranged at predetermined intervals along the center line of a concentric or spiral virtual track.
  • it is possible to adjust the convergence state of the light beam so that the signal amplitude based on the pit, which is the output value of the amplitude detection means, becomes a predetermined value.
  • the amplitude detecting means includes an averaging means for averaging and outputting a signal amplitude based on the detected plurality of pits.
  • the signal amplitude detected when the light beam passes over the pit and when the light beam passes between the pits changes. It is possible to adjust the convergence state of the light beam using the signal amplitude based on.
  • the apparatus further comprises tracking control means for causing the light beam to follow the center line of the virtual track, and operating the tracking control means so that the output of the amplitude detection means becomes a predetermined value. It is preferable to change the convergence state of the beam. According to this configuration, by operating the tracking control means, the light beam can pass through a predetermined position with respect to the pit (on the clock pit or at an intermediate position between the wobbled pits). Therefore, it is possible to more stably adjust the convergence state of the light beam by reducing the fluctuation of the signal amplitude based on the signal.
  • the predetermined value is a maximum value of a signal amplitude based on the pit. That is, by adjusting the convergence state of the light beam so that the signal amplitude based on the pit becomes maximum, it becomes possible to minimize the jitter of the reproduced signal obtained from the optical disk. Therefore, it is possible to adjust the convergence state of the light beam more easily and faster than in the conventional method of measuring the error limit value of the reproduction signal. Also, since there is no need to provide a circuit for measuring the error rate of the reproduced signal, the device configuration can be simplified.
  • the pits may be formed as wobble pits which are allocated to the inner and outer peripheral sides with respect to the center line of the virtual track. According to such a configuration, among the pits provided on the record carrier, even if the amplitude of the signal based on the wobbled pits distributed and arranged on the inner and outer peripheries with respect to the center line of the track for tracking control is used, The convergence state of the beam can be adjusted to a predetermined state.
  • the pit may be a center of the virtual track.
  • Clock pits for generating clock signals arranged at predetermined intervals on the line can also be used. According to such a configuration, among the pits provided on the record carrier, the convergence state of the light beam can be adjusted to a predetermined state by using the clock pit provided for generating the clock signal. .
  • the optical recording / reproducing apparatus of the present invention includes: a light converging means for converging a light beam on the disc-shaped record carrier of the present invention; and Focus control means for controlling the position of the light converging means, and amplitude detecting means for detecting a signal amplitude based on the pit from the reflected light from the record carrier, wherein the output of the amplitude detecting means has a predetermined value.
  • the convergence state of the light beam is changed so that According to such a configuration, the optimum value of the bias voltage applied to optimize the convergence state of the light beam on the record carrier can be determined based on the signal amplitude based on the pit.
  • the apparatus can be simplified because the error rate measurement system required when adjusting the bias voltage based on the error rate of the reproduction signal is not required. Further, the convergence state of the light beam can be optimized only by operating the focus control system without operating the tracking control system.
  • FIG. 1A is a perspective view showing the entire configuration of a disc-shaped record carrier of the present invention
  • FIG. 1B is an enlarged plan view schematically showing a state of formation of a pit on a surface.
  • FIG. 2 is a diagram showing the relationship between the ratio of the spot width to the spot size of the light beam and the signal amplitude.
  • FIG. 3 is a diagram illustrating the relationship between the ratio of the interval of the clock pit in the radial direction to the spot size of the light beam and the signal amplitude.
  • FIG. 4 is a block diagram showing the configuration of the optical recording / reproducing apparatus of the present invention.
  • 5A, 5B, and 5C are diagrams illustrating the operation of the astigmatism optical system of the optical recording / reproducing apparatus of the present invention.
  • FIG. 6 is a diagram showing a pit and a signal waveform detected from the pit.
  • FIG. 7 is a block diagram showing a configuration of a detection circuit of the optical recording / reproducing apparatus of FIG.
  • FIG. 8 is a diagram showing the relationship between the offset voltage, the amount of jitter of the reproduced signal, and the signal amplitude value of the clock pitch.
  • FIG. 1A and 1B are configuration diagrams of a disc-shaped record carrier 21 of the present invention.
  • FIG. 1A is a perspective view showing the entire configuration
  • FIG. 1B is a schematic diagram showing a pit formation state on a surface.
  • FIG. 1A is a perspective view showing the entire configuration
  • FIG. 1B is a schematic diagram showing a pit formation state on a surface.
  • a disc-shaped record carrier (hereinafter referred to as an optical disc) 21 has a recording film 2 laminated on a substrate 1, and a spiral virtual track 3, 4 is formed.
  • One round (360 °) of tracks 3 and 4 is divided into 128 segments 5.
  • FIG. 1B schematically shows a state of formation of a pit in one segment.
  • the horizontal direction on the paper indicates the track circumferential direction, and the light beam spot moves from left to right on the paper.
  • Each segment 5 includes a clock pit 6 for generating a synchronizing signal in the direction of travel of the light beam spot, a wobbled pit 7 and 8 for obtaining a tracking signal, and address data or predetermined data.
  • Address pits 9 in which information is distributed in units of 1 bit and areas where additional recording and erasing of information or signals can be performed Areas 10 are provided in order.
  • the pebble pits 7 and 8 are formed at equal distances from the center line of the virtual tracks 3 and 4 to the inner and outer radial sides in the radial direction.
  • the arrangement of the pebble pits 7, 8 differs between adjacent virtual tracks when viewed along the direction of movement of the light beam spot.
  • FIG. 1B the arrangement of the pebble pits 7, 8 with respect to the center line of the virtual track is shown. Indicates the virtual track as 3 and 4.
  • the radial width of the pits 6, 7, 8, and 9 and the radial interval between the clock pits 6 are light beams converged on the optical disk 21.
  • the spot size is set so as to have a predetermined ratio with respect to the spot size (the width at which the relative intensity of the laser beam output from the objective lens 33 of the optical recording / reproducing apparatus in FIG. 4 described below is 50%). I have.
  • the depth of the pits 6, 7, 8, and 9 is set to, for example, 5 for the wavelength ⁇ of the laser beam, and the circumferential length of the pit is 0.8 times the spot size of the light beam.
  • the horizontal axis represents the ratio of the radial width of the pit to the spot size of the light beam
  • the vertical axis represents the signal amplitude as a relative value with the maximum value being one.
  • the depth of the clock pit 6 is set to ⁇ / 5 with respect to the wavelength ⁇ of the laser beam, and the circumferential length of the clock pit 6 is set to 0.8 times the spot size of the light beam.
  • the signal amplitude based on the pits is It changes as shown in 3.
  • the horizontal axis represents the ratio of the radial spacing of the clock pit 6 to the spot size of the light beam
  • the vertical axis represents the signal amplitude as a relative value with the maximum value being one. If the radial distance between the clock pits 6 is set to 1.4 times or less the spot size of the light beam, even if the light beam passes between the clock pits 6 (dotted line). However, when the light beam passes over the clock pit 6 (solid line), it is possible to obtain an amplitude substantially equal to the signal amplitude obtained (90% or more).
  • the light beam is In this case, it is possible to detect substantially the same signal amplitude when the light beam passes over the pit and when the light beam passes between the pits.
  • FIG. 4 is a block diagram of the optical recording / reproducing apparatus of the present invention for recording / reproducing a signal on / from the optical disk 21 of FIG.
  • 21 is an optical disk shown in FIG. 1A
  • 32 is an optical head for recording information on the optical disk 21 or reproducing information recorded on the optical disk 21.
  • Light generated from a light source provided inside the light head 32 is collected on the optical disk 21 by the objective lens 33.
  • 35 and 40 are photodetectors for detecting a signal recorded on an optical disc 21 It is.
  • the photo detectors 35, 40, 49 are mounted inside the optical head 32.
  • the optical head 32 is configured to be able to be transported in the radial direction of the optical disk 21 by the feed mode 34.
  • the optical disk 21 is mounted on a spindle motor (not shown) and rotates at a predetermined rotation speed.
  • a light beam output from a semiconductor laser (not shown) mounted on the optical head 32 is converged and irradiated onto the optical disk 21 by the objective lens 33.
  • the reflected light from the optical disk 21 is split by an optical system (not shown) provided inside the optical head 32.
  • One of the divided reflected lights passes through an astigmatic optical system (not shown), and then irradiates a photodetector 49 divided into four parts.
  • the other reflected light is an analyzer (not shown). After passing through the above, the light detectors 35, 40 for recording signal detection are irradiated.
  • the photodetector 49 is installed at a position where the cross section of light passing through an astigmatism optical system (not shown) becomes circular when the recording film 2 of the optical disk 21 is at the focal position of the objective lens 33. ing.
  • the beam cross section 31 on the photodetector 49 becomes an ellipse long in the diagonal direction as shown in FIG. 5B. . Therefore, the four cells 36, 37, 38, 3
  • the detection signals A, C, D, and B respectively output from 9 are (A + B)> (C + D).
  • the beam cross section 31 on the photodetector 49 is orthogonal to the long axis of the ellipse in FIG. 5B as shown in FIG. 5C. Ellipse having a major axis in the direction of Therefore, the detection signals A, C, D, and B respectively output from the four cells 36, 37, 38, and 39 are (A + B) ⁇ (C + D).
  • the output signals A and B of the cell 36 and the cell 39 on the photodetector 49 are added by the adder 43 and input to the differential amplifier 44.
  • the output signals C and D of the cells 37 and 38 on the photodetector 49 are added by the adder 42 and input to the differential amplifier 44.
  • the focus error signal FE output from the differential amplifier 44 is input to the focus control circuit 45.
  • the focus control circuit 45 adds the output signal of the adder 42 and the output signal of the adder 43 (that is, adds all the detection signals A, B, C, and D of the photodetector 49). It consists of a controlled AGC (Automatic Gain Adjuster) and a high-pass filter.
  • AGC Automatic Gain Adjuster
  • the output signal from the focus control circuit 45 is applied to the drive circuit 46 via the adder 51 and the SW circuit (switching circuit) 52, and the output signal of the drive circuit 46 is applied to the focus coil 53. .
  • a current corresponding to the focus error signal FE flows through the focus coil 53, and the objective lens 33 is driven.
  • a SW circuit 52 is for setting the focus control system to an operation state or a non-operation state.
  • the other split light of the reflected light from the optical disc 21 passes through an analyzer (not shown) or the like, and then irradiates the photodetectors 35 and 40 for detecting recording signals.
  • Light is distributed to the photodetectors 35 and 40 according to the direction of magnetization on the optical disc 21 by the action of the analyzer. Therefore, the information signal recorded in the form of the direction of magnetization on the optical disc 21 is detected by taking the difference between the output signal of the photodetector 35 and the output signal of the photodetector 40 (see FIG. Omitted). Signals are recorded at a very high density on the optical disk 21, and high-response elements are used for the photodetectors 35 and 40 for detecting the signals.
  • a synchronization signal is generated at the beginning of a segment 5 formed by dividing one round of the track into 128.
  • a clock pit 6 wobbled pits 7 and 8 for obtaining a tracking signal, and an address pit 9 in which address data is dispersed for each bit.
  • these pits are extremely small, with a radial width of at least 0.5 times the spot size of the light beam and a circumferential length of 0.8 times the spot size. Have been.
  • the reflected light from the pit portion is much smaller than the reflected light from portions other than the pit portion, so the presence or absence of the pit is determined by the amount of reflected light from the optical disk 21. It is possible to detect.
  • the above-described detection of the pit is performed by adding the output signal of the photodetector 35 and the output signal of the photodetector 40 by the adder 41.
  • the output signal of the adder 41 is input to the detection circuit 47.
  • FIG. 6A shows the clock pit 6, the wobbled pits 7, 8, and the address pit 9 on the virtual track 3 (or 4) shown in FIG. 1B.
  • FIG. 6B shows the output signal waveform of the adder 41 corresponding to each pit.
  • FIG. 7 is a block diagram showing a configuration of the detection circuit 47.
  • the clock bit detection circuit 54 constituted by a logic circuit or the like detects the clock bit 6 and outputs the detection signal to the PLL circuit 55. Output to
  • circuit 55 outputs the pulse-like timing signal shown in Fig. 6 (c), operates the peak detection circuit 56 (see Fig. 7) at the timing shown in Fig. 6 (c), and 41
  • the peak value of peak 11 corresponding to clock pit 6 in the output signal waveform from Fig. 6 (Fig. 6 (b)), that is, the signal amplitude value Sc based on clock pit 6 is detected.
  • the timing signal output from the PLL circuit 55 is delayed for a predetermined time by the timer 59 (see FIG. 7), and then at the timing shown in FIG. 6 (d), the peak detection circuit 57 (see FIG. 7) To detect the peak value of the peak 12 corresponding to the wobbled pit 7 in the output signal waveform (FIG. 6 (b)) from the adder 41, that is, the signal amplitude value Swl based on the wobbled pit 7 .
  • the timing signal output from the PLL circuit 55 is delayed for a predetermined time by the timer 60 (see FIG. 7), and then the peak detector 58 (see FIG. 7) at the timing shown in FIG. 6 (e).
  • the peak value of the peak 13 corresponding to the wobbled bit 8 in the output signal waveform from the adder 41 (Fig. 6 (b)), that is, the signal amplitude value Sw2 based on the wobbled bit 8 is calculated. To detect.
  • Output signal Swl of peak detection circuit 57 and output signal of peak detection circuit 58 By calculating the difference between the signals Sw2, it is possible to detect a position shift signal between the light beam and the virtual track 3 (or 4), that is, a tracking error signal, and use this to perform tracking control.
  • a position shift signal between the light beam and the virtual track 3 (or 4) that is, a tracking error signal
  • a well-known method can be used for the specific method, the description is omitted because it is not directly related to the present invention.
  • the output signal Sc of the peak detection circuit 56 is input to a control circuit 48 (see FIG. 4) composed of DSP and the like.
  • the control circuit 48 applies the offset voltage to the focus control system while monitoring the output signal S c of the peak detection circuit 56, until the output signal S c of the peak detection circuit 56 reaches a predetermined value.
  • the convergence state of the light beam on the optical disk 21 is changed.
  • the predetermined value may be a value that maximizes the signal amplitude Sc based on the clock pit 6, or may be set to an arbitrary value that is convenient for the recording / reproducing device.
  • an offset voltage value at which the signal amplitude Sc based on the clock pitch 6 is maximized may be applied to the focus control system.
  • the wobbled pits 7 and 8 are pits for detecting a positional shift between the light beam and the track, the light beam is located between the pit and the light beam between the pits. In some cases, the detected signal amplitude is set to change. However, the wobble pits 7, 8 can be set to the same width, the same depth, and the same length as the clock pit 6. Therefore, the signal amplitude based on the wobbled pits 7 and 8 is measured while the tracking control system is operating, and the convergence state of the light beam is adjusted so that the signal amplitude based on the wobbled pits 7 and 8 is maximized. It is possible to make adjustments so that the playback time is minimal.
  • the average value of the signal amplitude based on the wobbled pits 7 and 8 is detected, and the convergence state of the light beam is adjusted so that the average value is maximized. It can be adjusted to minimize the playback jitter.
  • the clock pit 6 and the wobbled pits 7 and 8 are formed at the stage of creating the optical disk 21.
  • the signal amplitude based on such a pit is used to adjust the convergence state of the light beam, so that the conventional method is used. As described above, it is not necessary to perform the operation of recording the information for adjusting the focus state while the apparatus is being activated immediately before the adjustment. Therefore, it is possible to shorten the start-up time of the optical recording / reproducing apparatus.
  • the present invention is not limited at all by the above-described embodiment.
  • the case where the pit depth is set to ⁇ / 5 with respect to the wavelength ⁇ of the laser beam has been described.
  • the pit depth may be further increased or reduced. Is also good.
  • the case where the pit length is 0.8 times the spot size of the light beam has been described, but a shorter pit may be used.
  • the focus error signal is detected using the astigmatism method.
  • a focus error detection method called an SSD (spot size detection) or a focus error detection method using a knife edge is used. May be.
  • an example in which the pits are formed radially along the spiral virtual track has been described. good.
  • the radial width of the pits and the radial distance between the pits are set at a predetermined ratio with respect to the spot size of the light beam for recording and reproduction.
  • the signal amplitude detected from the pit can be made substantially equal between the case where the light beam passes over the pit and the case where the light beam passes between the pits. As a result, it is possible to detect the signal amplitude based on the pit necessary for optimizing the convergence state of the optical beam only by operating the focus control system without operating the tracking control system.
  • the optical recording / reproducing apparatus of the present invention changes the convergence state of the light beam so that the output of the amplitude detecting means for detecting the signal amplitude based on the pit from the reflected light from the record carrier becomes a predetermined value.
  • the signal amplitude based on the pit is Therefore, it is possible to adjust the convergence state of the light beam to a predetermined value. Therefore, by using the disc-shaped record carrier of the present invention in combination with the optical recording / reproducing apparatus, the tracking control system operates. Before the adjustment, the convergence state of the light beam can be adjusted optimally, so that the operation of the tracking control system can be made more stable.
  • the clock pit and the wobbled pit are formed at the stage of producing the record carrier.
  • the adjustment is performed before the adjustment. It is not necessary to perform the operation of recording the information for adjusting the focus state during the start-up of the apparatus. Therefore, the start-up time of the optical recording / reproducing apparatus can be reduced.
  • the device configuration can be simplified.
  • the present invention can be used as an inexpensive and easy-to-use record carrier and optical recording / reproducing apparatus.

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  • Optical Recording Or Reproduction (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

L'invention concerne un appareil d'enregistrement/de reproduction optique servant à ajuster l'état d'un faisceau lumineux de sorte que la gigue du signal reproduit puisse être minime, par application d'une tension de polarisation à un système de commande de focalisation. L'invention concerne également un support d'enregistrement de type disque (21) présentant une largeur d'alvéoles et un intervalle dans le sens radial dont les rapports par rapport à la taille du spot du faisceau lumineux d'enregistrement/de reproduction sont prédéterminés. L'état focalisé du faisceau lumineux sur le support d'enregistrement est ajusté de sorte que l'amplitude du signal produite par une alvéole puisse être maximale. Ainsi, sans enregistrement préalable d'un signal sur un support d'enregistrement, l'état focalisé du faisceau lumineux est optimisé, ce qui réduit le temps de démarrage de l'appareil.
PCT/JP2000/008062 1999-11-17 2000-11-15 Support d'enregistrement de type disque et appareil d'enregistrement/de reproduction optique comprenant ledit support WO2001037270A1 (fr)

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JP32653699A JP2001143328A (ja) 1999-11-17 1999-11-17 円盤状記録担体およびそれを用いた光学式記録再生装置
JP11/326536 1999-11-17

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US20080207426A1 (en) * 2005-05-31 2008-08-28 Advanced Glass Ceramics Establishment Heat Insulating Composite and Methods of Manufacturing Thereof

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JPH0729186A (ja) * 1993-07-16 1995-01-31 Ricoh Co Ltd 光学的情報記録媒体及びそれを用いた記録・再生方法
EP0867869A2 (fr) * 1997-03-28 1998-09-30 Kabushiki Kaisha Toshiba Support de stockage d'information et appareil de lecture d'information

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JPH02285522A (ja) * 1989-04-26 1990-11-22 Ricoh Co Ltd ディスクリートブロックフォーマット方式の光情報記録媒体
JPH0485728A (ja) * 1990-07-27 1992-03-18 Sony Corp サーボオフセット自動調整装置
JPH0573926A (ja) * 1991-09-13 1993-03-26 Hitachi Maxell Ltd 光デイスク
JPH0729186A (ja) * 1993-07-16 1995-01-31 Ricoh Co Ltd 光学的情報記録媒体及びそれを用いた記録・再生方法
EP0867869A2 (fr) * 1997-03-28 1998-09-30 Kabushiki Kaisha Toshiba Support de stockage d'information et appareil de lecture d'information

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