WO2008020353A2 - Mesure de la qualité d'un spot pendant un enregistrement - Google Patents

Mesure de la qualité d'un spot pendant un enregistrement Download PDF

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Publication number
WO2008020353A2
WO2008020353A2 PCT/IB2007/052942 IB2007052942W WO2008020353A2 WO 2008020353 A2 WO2008020353 A2 WO 2008020353A2 IB 2007052942 W IB2007052942 W IB 2007052942W WO 2008020353 A2 WO2008020353 A2 WO 2008020353A2
Authority
WO
WIPO (PCT)
Prior art keywords
reflected light
spherical aberration
optical
rld
sacs
Prior art date
Application number
PCT/IB2007/052942
Other languages
English (en)
Other versions
WO2008020353A3 (fr
Inventor
Maarten M.I. Kuijper
Original Assignee
Koninklijke Philips Electronics N.V.
U.S. Philips Corporation
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 Koninklijke Philips Electronics N.V., U.S. Philips Corporation filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2008020353A2 publication Critical patent/WO2008020353A2/fr
Publication of WO2008020353A3 publication Critical patent/WO2008020353A3/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
    • G11B7/08—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
    • G11B7/0948—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following specially adapted for detection and avoidance or compensation of imperfections on the carrier, e.g. dust, scratches, dropouts
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1392—Means for controlling the beam wavefront, e.g. for correction of aberration
    • G11B7/13925—Means for controlling the beam wavefront, e.g. for correction of aberration active, e.g. controlled by electrical or mechanical means
    • G11B7/13927—Means for controlling the beam wavefront, e.g. for correction of aberration active, e.g. controlled by electrical or mechanical means during transducing, e.g. to correct for variation of the spherical aberration due to disc tilt or irregularities in the cover layer thickness
    • 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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/006—Overwriting
    • G11B7/0062—Overwriting strategies, e.g. recording pulse sequences with erasing level used for phase-change media

Definitions

  • the present invention generally relates to a recording of information onto an optical recording medium of any type (e.g., DVD+/-R/RW, BD-R/RE, and HD-DVD-R/RW).
  • the present invention specifically relates to an "in-situ" spherical aberration measurement during the recording of information onto the optical recording medium.
  • FIG. 1 illustrates a nominal formation of an information mark 30 within an optical beam spot 20 on an optical recording medium during a recording of information onto the optical recording medium.
  • a nominal formation of a plurality of information marks 30 onto the optical recording medium facilitates an optimal scanning of each information mark 30 during a subsequent reading of the information recorded onto the optical recording medium.
  • the nominal properties of optical beam spot 20 changes in response to a spherical aberration of the optical beam on the optical recording medium.
  • a spherical aberration of the optical beam on the optical recording medium can expand optical beam spot 20 to become an optical beam spot 21 whereby information mark 30 shrinks to become information mark 31.
  • a spherical aberrated formation of one or more information marks 31 onto the optical recording medium results in a less than optical scanning of each intended information mark 30 during a subsequent reading of the information recorded onto the optical scanning medium.
  • the present invention provides a new and unique technique for correcting a spherical aberration of the optical beam being used to record information onto the optical recording medium
  • an optical information recording system employs a reflected light detector, a controller and a spherical aberration compensator for correcting a spherical aberration of an optical beam recording information onto an optical recording medium
  • the reflected light detector is in optical communication with the optical recording medium to detect a reflected light reflecting from the optical recording medium during the recording of the information onto the optical recording medium, wherein the reflected light detector is operable to generate one or more reflected light detection signals based on an average reflected light level of the reflected light
  • the controller is in electrical communication with the reflected light detector to receive the reflected light detection signal(s), wherein the controller is operable to generate a spherical aberration compensation setting signal representative of an optimal spherical aberration compensation setting based on the average reflected light level of the reflected light in response to the reflected light detection signal(s)
  • the spherical aberration compensator is in electrical communication with the controller to receive the spherical aberration compensation setting signal, wherein the s
  • an optical information recording controller for correcting a spherical aberration of an optical beam recording information onto an optical recording medium
  • the optical information recording controller comprises a processor and a memory stonng instructions executable by the processor for receiving one or more reflected light detection signals based on an average reflected light level of a reflected light reflecting from the optical recording medium during the recording of the information onto the optical recording medium
  • the instructions are further executable by the processor for generating a spherical aberration compensation setting signal in response to the reflected light detection signal(s), wherein the spherical aberration compensation setting signal is representative of an optimal spherical aberration compensation setting of a spherical aberration compensator relative to an optical path of the optical beam
  • an optical information recording method for correcting a spherical aberration of an optical beam recording information onto an optical recording medium
  • the method comprises a generation of one or more reflected light detection signals based on an average reflected light level of a reflected light reflecting from the optical recording medium during the recording of the information onto the optical recording medium
  • the method further comprises a generation of a spherical aberration compensation setting signal in response to the reflected light detection signal(s), wherein the spherical aberration compensation setting signal is representative of an optimal spherical aberration compensation setting of a spherical aberration compensator relative to an optical path of the optical beam
  • FIG 1 illustrates a nominal formation of an information mark on an optical recording medium as known in the art
  • FIG 2 illustrates a spherical aberrated formation of an information mark on an optical recording medium as known in the art
  • FIG 3 illustrates a block diagram of one embodiment of an optical information recording s> stem in accordance with the present invention
  • FIG 4 illustrates a graph of an exemplary optical beam generated by the optical information recording system of FIG 3 during an information recording of an optical recording medium
  • FIG 5 illustrates a graph of an exemplary nominal reflected light measured by the optical information recording system of FIG 3 during an information recording of an optical recording medium
  • FIG 6 illustrates a graph of an exemplary sphe ⁇ cal aberrated reflected light measured by the optical information recording system of FIG 3 during an information recording of an optical recording medium
  • FIG 7 illustrates an exemplary correlation graph of an average reflected light level of the reflected light during a formation of a mark and a recording jitter of the mark relative to a collimotor position
  • FIG 8 illustrates a graph of an exemplary nominal CALF signal generated by the optical information recording system of FIG 3 during an information recording of an optical recording medium
  • FIG 9 illustrates a graph of an exemplary spherical aberrated CALF signal generated by the optical information recording system of FIG 3 during an information recording of an optical recording medium
  • FIG 10 illustrates a flowchart representative of an average reflected light correction embodiment of a spherical aberration compensation method in accordance with the present invention
  • FIG 11 illustrates an exemplary correlation graph of an asymmetry of the reflected light during a formation of a mark and a recording jitter of the mark relative to a collimotor position
  • FIG 12 illustrates a graph of an exemplary nominal asymmetry of the reflected light detection signal generated by the optical information recording system of FIG 3 during an information recording of an optical recording medium
  • FIG 13 illustrates a graph of an exemplary spherical aberrated asymmetry of the reflected light detection signal generated by the optical information recording system of FIG 3 during an information recording of an optical recording medium
  • FIG 14 illustrates a flowchart representative of a first embodiment of a reflected light asymmetry correction embodiment of a spherical aberration compensation method in accordance with the present invention
  • An optical information recording system 50 of the present invention as shown in FIG 3 is operated to direct an optical beam OB onto a recording layer 41 of an optical recording medium 40 (e g , DVD+/-R/RW, BD-R/RE, and HD-DVD-R/RW) to thereby record information (e g , marks and spaces) onto medium 40
  • system 50 employs a polarized beam splitter 52, a spherical element compensator 53 (e g , a telescope, a collimotor or LC-cells) and an objective lens 54 to define an optical path for optical beam OB from a laser 51 to recording layer 41 of medium 40.
  • recording layer 41 of medium 40 has a uniform specified thickness to facilitate a nominal formation of information onto medium 40 (e.g., nominal formation of marks and spaces on a recording surface of recording layer 41).
  • the thickness of recording layer 41 will typically be erratic relative to the specified thickness causing a spherical aberrated formation of information onto medium 40 (e.g., a spherical aberrated formation of marks and spaces on a recording surface of recording layer 41).
  • a controller 70 generates and provides a spherical aberration compensation setting signal SACS and a focus setting signal FCS to compensator 53 and lens 54, respectively, as needed to thereby actuate compensator 53 and lens 54 as know in the art relative to the optical path of optical beam OB in view of offsetting any erratic thickness of recording layer 41.
  • system 50 further employs a reflected light detector 60 in conjunction with controller 70 to facilitate the generation of spherical aberration compensation setting signal SACS based on an average reflected light level of a reflected light RL measured by detector 60.
  • detector 60 employs an average reflected light detector (“AVGRLD”) 61, a minimum reflection light detector (“MINRLPD”) 62 and a maximum reflected light detector (“MAXRLPD”) 63 to thereby generate and provide an N number of reflected light detection signals RLD to controller 70, where N > 1.
  • controller 70 employs a processor 71 and a memory 72 storing instructions executable by processor 71 to implement a spherical aberration compensation method of the present invention in response to the reflected light detection signal(s) RLD to thereby facilitate controller 70 in achieving a nominal formation of information onto medium 40 to the greatest extent possible based on an average reflected light level of reflected light (RL).
  • AVGRLD average reflected light detector
  • MINRLPD minimum reflection light detector
  • MAXRLPD maximum reflected light detector
  • optical beam OB and reflected light RL will now be provided herein in connection with FIGS. 4-6.
  • This exemplary description of optical beam OB and reflected light RF is provided in the context of a N-I write pulse strategy for forming marks onto medium 40. Nonetheless, those having ordinary skill in the art will appreciate the applicability of additional write strategies for the formation of marks onto medium 40 under the inventive principles of the present invention
  • FIG 4 illustrates optical beam OB being generated by laser 51 at an erase power level Pe during the formation of the spaces, and being pulsed by laser 51 between a write power level Pw and a bias power level Pb during the formation of the mark
  • reflected light RL will have a nominal erase level NRLpe during the formation of the spaces as shown in FIG 5, and will oscillate between a nominal write peak level NRLpw and a nominal bias peak level NRLpb during the formation of the mark as shown in FIG 5
  • recording layer 41 having an erratic thickness relative to the uniform specified thickness reflected light RL will substantially maintain nominal erase level NRLpe during the formation of the spaces as shown in FIG 6, and will oscillate between a spherical aberrated write peak level SARLpw and a spherical aberrated bias peak level SARLpb during the formation of the mark as shown in FIG 6
  • spherical aberrated write peak level SARLpw is greater than
  • a first embodiment of the spherical aberration compensation method of the present invention is premised on a correlation of the average reflected light level of reflected light RL during a formation of a mark and recording jitter of the mark relative to an optical path position of spherical aberration compensator 53 (FIG 3) in the form of a collimotor
  • a CALF signal indicative of the average reflected light level of reflected light RL during the formation of the mark and the recording jitter of the mark are plotted relative to the optical path position of the collimotor Ideally, with recording layer 41 ha ⁇ ing the uniform specified thickness, the CALF signal would have an exemplary nominal average reflected light level CALF N w as shown in FIG 8 during the formation of the mark However, with recording layer 41 having an erratic thickness relative to the specified thickness, the CALF signal would have a higher exemplary spherical aberrated average reflected light level CALFsw as shown in FIG. 9 during the formation of the mark. Nonetheless, as shown in FIG.
  • a minimal CALF signal (e.g., a collimotor position of 2723) during the formation of the mark correlates to a minimal recording jitter of the mark (e.g., a collimotor position of 2775).
  • the first embodiment of the spherical aberration compensation method of the present invention is directed to minimizing the spherical aberrated average reflected light level CALF sw of CALF signal to the greatest extent possible during each mark recording with the minimized spherical aberrated average reflected light level CALFsw being equal to or inconsequentially greater than the nominal average reflected light level CALF N w in dependence upon the thickness quality of recording layer 41.
  • a stage S82 of flowchart 80 encompasses detector 61 (FIG. 3) determines an average reflected light level of reflected light RL, preferably over the entire recording process (i.e., the complete formation of all marks and spaces needed to record the information onto medium 40).
  • reflected light RL is filtered through a low-pass filter as known in the art over the entire recording process to facilitate a generation by detector 61 of the CALF signal with a volatile spherical aberrated average reflected light level CALF SW .
  • Reflected light detector 60 provides an average reflected detection signal RLD AVG (i.e., the CALF signal or a conditioned version thereof) indicative of the average reflected light level of reflected light RL as measured by detector 61 to controller 71.
  • RLD AVG average reflected detection signal
  • controller 71 performs spherical aberration compensation of optical beam OB via spherical aberration compensation setting signal SACS (FIG. 1) as known in the art.
  • controller 71 additionally monitors the average reflected light level of reflected light RL during stage S 84 to thereby ascertain during a stage S 86 of flowchart 80 whether the average reflected light level of reflected level RL is increasing as indicated by average reflected detection signal RLD A VG.
  • processor 71 will adjust spherical aberration compensation setting signal SACS during a stage S 88 of flowchart 80 as needed in terms of magnitude and/or polarity to minimize the average reflected light level of reflected level RL to the greatest extent possible (e.g., adjusting spherical aberration compensation setting signal SACS to decrease spherical aberrated average reflected light level CALF SW towards nominal average reflected light level CALF N w)-
  • Stages S84-S88 are designed as a continual loop to thereby aptly react to average reflected detection signal RLD AVG with a view of continually striving for an optimal spherical aberration compensation For example, as illustrated in FIG 7, an increase in the CALF signal can be compensated by adjusting spherical aberration compensation setting signal SACS to thereby change the optical position of the collimotor in a manner that decreases the CALF signal
  • stages S84-S88 are designed as a trial and
  • the level of average reflected detection signal RLD A VG can be effected by any fluctuations in the optical power of optical beam OB as known in the art
  • controller 70 can further receive a forward sense signal FW as shown in FIG 3 that is indicative of any fluctuations in the optical power of optical beam OB whereby processor 71 can factor in such fluctuations during an adjustment of spherical aberration compensation signal SAO during stage S88
  • the average reflected light level of reflecting light RL as indicated by average reflected detection signal RLD AVG may experience sporadic insignificant fluctuations that need not be addressed by an adjustment to the spherical aberration compensation setting signal SACS
  • it can be more efficient for processor 71 to ascertain an increasing trend of the average reflected light level of reflected light RL as indicated by average reflected detection signal RLD AVG during stage S86 as a requirement for proceeding to stage S88 to thereby adjust the spherical aberration compensation setting signal SACS in view of a significant increase in the average reflected light level of reflected light RL
  • the increasing trend can be
  • a second embodiment of the spherical aberration compensation method of the present invention is premised on a correlation of the asymmetry A1-A2 of reflected light RL during a formation of a mark and recording jitter of the mark relative to an optical path position of spherical aberration compensator 53 (FIG 3) in the form of a collimotor Specifically, as illustrated in FIG. 11, an asymmetry A1-A2 of reflected light RL during the formation of the mark and the recording jitter of the mark are plotted relative to the optical path position of the collimotor. Ideally, with recording layer 41 having the uniform specified thickness, the asymmetry A1-A2 of reflected light RL would have an exemplary nominal asymmetrical value relative to nominal average reflected light level CALF N w as shown in
  • FIG. 12 during the formation of the mark.
  • the asymmetry A1-A2 of reflected light RL would have a higher exemplary asymmetrical value relative to spherical aberrated average reflected light level CALF SW or a AC-coupled averaged reflected light level CALF A c as shown in FIG. 13 during the formation of the mark.
  • a maximal asymmetry A1-A2 of reflected light RL e.g., a collimotor position of 2721
  • a minimal recording jitter of the mark e.g., a collimotor position of 2775.
  • the second embodiment of the spherical aberration compensation method of the present invention is directed to maximizing the asymmetry Al- A2 of reflected light RL signal relative to spherical aberrated average reflected light level CALFsw or a AC-coupled averaged reflected light level CALF A c to the greatest extent possible during each mark recording with the maximized spherical asymmetry A1-A2 of reflected light RL relative to spherical aberrated average reflected light level CALF SW or a AC-coupled averaged reflected light level CALF A c being equal to or inconsequentially less than the spherical asymmetry A1-A2 of reflected light RL relative to nominal average reflected light level CALF N w in dependence upon the thickness quality of recording layer 41.
  • FIG. 14 illustrates a flowchart 90 representative of the second embodiment of spherical aberration compensation method of the present invention.
  • a stage S92 of flowchart 90 encompasses detector 62 (FIG. 3) determining a bias peak reflected light level of the reflected light (e.g., SARLpb of FIG. 13), preferably over each mark recording.
  • Stage S92 further encompasses detector 63 (FIG. 3) determining a written peak reflected light level of the reflected light (e.g., SARLpw of FIG. 13), preferably over each mark recording.
  • reflected light RL is filtered through a low-pass filter as known in the art over the entire recording process to facilitate a determination by detector 62 and detector 63 of the respective bias peak reflected light level and write peak reflected light level of reflected light RL.
  • reflected light detector 60 provides average reflected light detection signal RLD AVG as indication of the average reflected light level of reflected light RL to controller 71, a minimum reflected light detection signal RLD MN as an indication of bias peak reflected light level of reflected light RL, and a maximum reflected light detection signal RLD MAX as an indication of write peak reflected light level of reflected light RL to controller 71 to facilitate a determination by controller 71 of asymmetry A1-A2 of reflected light RL relative to the average reflected light level of reflected light RL.
  • a stage S94 of flowchart 90 encompasses controller 71 performing a spherical aberration compensation of optical beam OB via spherical aberration compensation setting signal SACS (FIG. 1) as known in the art.
  • controller 71 additionally monitors the bias peak reflected light level and the write peak reflected light level of reflected light RL to thereby calculate asymmetry A1-A2 of reflected light RL where Al is the bias peak reflected light level relative to the average reflected light level of reflected light RL and A2 is the write peak reflected light level relative to the average reflected light level of reflected light RL.
  • Controller 71 thereafter ascertains during a stage S96 of flowchart 90 whether the asymmetry A1-A2 of reflected level RL is decreasing. If so, then processor 71 will adjust spherical aberration compensation setting signal SACS during a stage S98 of flowchart 90 as needed in terms of magnitude and/or polarity to maximize the asymmetry A1-A2 of reflected level RL to the greatest extent possible (e.g., adjusting spherical aberration compensation setting signal SACS to decrease spherical aberrated reflected light levels SARLpb and SARLpw toward respective nominal aberrated reflected light levels NRLpb and NRLpw).
  • reflected light RL is filtered through an AC- filter/high pass filter as known in the art over the entire recording process to facilitate a determination by detector 62 and detector 63 of the respective bias peak reflected light level and write peak reflected light level relative to the AC-coupled average reflected light level CALF A C.
  • reflected light detector 60 provides a minimum AC- coupled reflected light detection signal RLDN A C as an indication of bias peak reflected light level of reflected light RL, and a maximum AC-coupled reflected light detection signal RLD MXAC as an indication of write peak reflected light level of reflected light RL to controller 71 to facilitate a determination by controller 71 of asymmetry A1-A2 of reflected light RL relative to the AC-coupled average reflected light level of reflected light RL (e.g., a zero value CALF AC of FIG. 13).
  • stage S94 of flowchart 90 encompasses controller 71 performing a spherical aberration compensation of optical beam OB via spherical aberration compensation setting signal SACS (FIG.
  • controller 71 additionally monitors the bias peak reflected light level and the write peak reflected light level of reflected light RL to thereby calculate asymmetry A1-A2 of reflected light RL where Al is the bias peak reflected light level relative to the AC-coupled average reflected light level of reflected light RL and A2 is the write peak reflected light level relative to the AC-coupled average reflected light level of reflected light RL. Controller 71 thereafter ascertains during stage S96 of flowchart 90 whether the asymmetry A1-A2 of reflected level RL is decreasing.
  • processor 71 will adjust spherical aberration compensation setting signal SACS during a stage S98 of flowchart 90 as needed in terms of magnitude and/or polarity to maximize the asymmetry A1-A2 of reflected level RL to the greatest extent possible (e.g., adjusting spherical aberration compensation setting signal SACS to decrease spherical aberrated reflected light levels SARLpb and SARLpw toward respective nominal aberrated reflected light levels NRLpb and NRLpw).
  • Stages S94-S98 are designed as a continual loop to thereby aptly react to the reflected detection signals RLD with a view of continually striving for an optimal spherical aberration compensation. For example, as illustrated in FIG. 11, a decrease in the asymmetry A1-A2 of reflected light RL can be compensated by adjusting spherical aberration compensation setting signal SACS to thereby change the optical position of the collimotor in a manner that increases the asymmetry A1-A2 of reflected light RL.
  • stages S94-S98 are designed as a trial and error loop that will change the optical position of the collimotor via spherical aberration compensation setting signal SACS as needed to a position corresponding to the greatest extent possible to the maximal level of the asymmetry A1-A2 of reflected light RL
  • the level of average reflected detection signals RLD can be effected by any fluctuations in the optical power of optical beam OB as known in the art.
  • controller 70 can further receive a forward sense signal FW as shown in FIG. 3 that is indicative of any fluctuations in the optical power of optical beam OB whereby processor 71 can factor in such fluctuations during an adjustment of spherical aberration compensation setting signal SACS during stage S98.
  • the asymmetry A1-A2 of reflecting light RL as indicated may experience sporadic insignificant fluctuations that need not be addressed by an adjustment to the spherical aberration compensation setting signal SACS.
  • processor 71 can ascertain an decreasing trend of the asymmetry A1-A2 of reflected light RL during stage S96 as a requirement for proceeding to stage S98 to thereby adjust the spherical aberration compensation setting signal SACS in view of a significant decrease in the asymmetry A1-A2 of reflected light RL.
  • the decreasing trend can be defined in any manner, such as, for example, as increase of the asymmetry A1-A2 of reflected light RL exceeding a threshold over a specified period of time or specified number of write/bias pulses.
  • focus setting signal FCS can also be adjusted during stage S98 to thereby counteract the decrease or decreasing trend in the asymmetry A1-A2 of reflected light RL.
  • FIGS. 3-14 those having ordinary skill in the art will appreciate numerous advantages of the present invention including, but not limited to, an improved and advanced spherical aberration compensation technique. Additionally, those having ordinary skill in the art will further appreciate how to apply the inventive principles of the present invention to forms of optical information recording systems other than the system shown in FIG. 3 and to writing strategies other than the writing strategy shown in FIG. 4. Furthermore, those having ordinary skill in the art will appreciate how to integrate flowchart 80 (FIG. 10) and flowchart 90 (FIG. 14) for a optical information recording system of the present invention.

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  • Optics & Photonics (AREA)
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Abstract

L'invention concerne un système (50) d'enregistrement d'informations optiques comportant un détecteur de lumière réfléchie (60), un contrôleur (70) et un compensateur d'aberration sphérique (53) permettant de corriger une aberration sphérique d'un faisceau optique (OB) enregistrant des informations sur un support d'enregistrement optique (40). Le détecteur de lumière réfléchie (60) génère un ou plusieurs signaux de détection de lumière réfléchie (RLD) à partir d'un niveau de lumière réfléchie moyen (CALF) d'une lumière réfléchie (RL) se réfléchissant à partir du support d'enregistrement optique (40). En réponse à un ou plusieurs signaux de détection de lumière réfléchie (RLD), le contrôleur (70) génère un signal de réglage de compensation d'aberration sphérique (SACS) représentatif d'un réglage de compensation d'aberration sphérique optimal selon le niveau de lumière réfléchie moyen (CALS) de la lumière réfléchie (RL). En réponse au signal de réglage de compensation d'aberration sphérique (SACS), le compensateur d'aberration sphérique (53) est actionné par rapport à un trajet optique du faisceau optique (OB) selon le réglage de compensation d'aberration sphérique optimal (SACS).
PCT/IB2007/052942 2006-08-14 2007-07-24 Mesure de la qualité d'un spot pendant un enregistrement WO2008020353A2 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1191523A2 (fr) * 2000-09-25 2002-03-27 Sony Corporation Appareil d'enregistrement optique, et procédé pour la commande de la puissance d'un laser pour celui-ci
EP1385158A2 (fr) * 2002-07-25 2004-01-28 Pioneer Corporation Procédé et appareil de correction de l'aberration sphérique
EP1385156A1 (fr) * 2002-07-25 2004-01-28 Pioneer Corporation Méthode et appareil pour corriger l'abérration sphérique
EP1538612A2 (fr) * 2003-10-31 2005-06-08 Pioneer Corporation Dispositif d'enregistrement optique et procédé de correction d'aberration
US6967914B2 (en) * 2001-05-28 2005-11-22 Sony Corporation Optical recorder and laser power control method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1191523A2 (fr) * 2000-09-25 2002-03-27 Sony Corporation Appareil d'enregistrement optique, et procédé pour la commande de la puissance d'un laser pour celui-ci
US6967914B2 (en) * 2001-05-28 2005-11-22 Sony Corporation Optical recorder and laser power control method
EP1385158A2 (fr) * 2002-07-25 2004-01-28 Pioneer Corporation Procédé et appareil de correction de l'aberration sphérique
EP1385156A1 (fr) * 2002-07-25 2004-01-28 Pioneer Corporation Méthode et appareil pour corriger l'abérration sphérique
EP1538612A2 (fr) * 2003-10-31 2005-06-08 Pioneer Corporation Dispositif d'enregistrement optique et procédé de correction d'aberration

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TW200818151A (en) 2008-04-16

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