WO2003046895A2 - Dispositif pour balayer un support d'enregistrement optique - Google Patents

Dispositif pour balayer un support d'enregistrement optique Download PDF

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Publication number
WO2003046895A2
WO2003046895A2 PCT/IB2002/004472 IB0204472W WO03046895A2 WO 2003046895 A2 WO2003046895 A2 WO 2003046895A2 IB 0204472 W IB0204472 W IB 0204472W WO 03046895 A2 WO03046895 A2 WO 03046895A2
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WO
WIPO (PCT)
Prior art keywords
signal
track
lagging
leading
spot
Prior art date
Application number
PCT/IB2002/004472
Other languages
English (en)
Other versions
WO2003046895A3 (fr
Inventor
Johannes H. M. Spruit
Johannes G. F. Kablau
Johannus L. Bakx
Original Assignee
Koninklijke Philips Electronics N.V.
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. filed Critical Koninklijke Philips Electronics N.V.
Priority to AU2002339619A priority Critical patent/AU2002339619A1/en
Publication of WO2003046895A2 publication Critical patent/WO2003046895A2/fr
Publication of WO2003046895A3 publication Critical patent/WO2003046895A3/fr

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/24—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by sensing features on the record carrier other than the transducing track ; sensing signals or marks recorded by another method than the main recording
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/14—Digital recording or reproducing using self-clocking codes
    • G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
    • 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
    • G11B7/0901—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 track following only
    • G11B7/0903—Multi-beam tracking systems
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
    • G11B27/30—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording
    • G11B27/3027—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording used signal is digitally coded
    • 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

Definitions

  • the invention relates to a device for scanning a record carrier, the record carrier comprising substantially parallel tracks exhibiting first variations of a first physical parameter of the track, the first variations representing main information recorded on the record carrier, and second variations of a second physical parameter of the track, a modulation pattern of the second variations representing auxiliary information
  • the device comprising scanning means for moving the track relative to a main spot in a track direction at a scanning speed, the scanning means comprising tracking means for centering the main spot on the track in a transversal direction transversal to the track direction, a head for emitting at least one radiation beam forming the main spot, a leading satellite spot and a lagging satellite spot, both satellite spots being located oppositely in the transversal direction and the leading satellite spot being located at an inter-satellite distance before the lagging spot in the track direction, a detector for generating a main signal, a leading signal and a lagging signal from radiation received via the track from the main spot, the leading satellite spot and the lagging satellite spot respectively, and reading
  • a device for recording or reading information on a record carrier is known from US 5,303,216.
  • the record carrier comprises tracks in which the information is represented in a predefined manner by optically readable marks.
  • the track further has variations of a physical parameter, such as an periodic excursion of the track in a transverse direction (further denoted as wobble).
  • the wobble can be used to encode addresses (like in CDR) and can be detected for determining the linear speed of the track.
  • For detecting the wobble a three beam optical head is used. A center spot is formed on the track and two satellite spots at a transverse distance of half the track pitch. One satellite spot is leading and the other is lagging by a distance of an odd multiple of one fourth of the period of the wobble along the track with respect to the center spot.
  • the wobble is detected from sum and difference of the signals from the spots.
  • a problem of the known system is that the detection of the wobble is disturbed by the presence of signal components generated by the optical marks.
  • the device as described in the opening paragraph is characterized in that the detection unit comprises delay means for generating a delayed leading signal being delayed substantially as long as the time to move the track at the scanning speed over the inter-satellite distance, and combining means for combining the delayed leading signal and the lagging signal for generating the combined signal.
  • the detection unit comprises delay means for generating a delayed leading signal being delayed substantially as long as the time to move the track at the scanning speed over the inter-satellite distance, and combining means for combining the delayed leading signal and the lagging signal for generating the combined signal.
  • An embodiment of the device according to the invention is characterized in that the delay means are coupled to scanning speed detection means for setting the delay to a variable time in dependence of the scanning speed.
  • the advantage is that the delay is based on the actual scanning speed, and therefore the reduction of the disturbance is achieved at every scanning speed.
  • Fig. 1 a shows a disc-shaped record carrier
  • Fig. lb shows a cross-section of the record carrier
  • Fig. lc shows a periodic variation of the lateral position of the track
  • Fig. Id shows a variation of the width of the track
  • Fig. le shows tracks on the record carrier and positions of the spots
  • Fig. 2 shows a wobble detector
  • Fig. 3 shows a wobble detector with a HF PLL
  • Fig. 4 shows a wobble detector using alternating sampling
  • Fig. 5 shows a playback device
  • Fig. 6 shows a recording device.
  • Corresponding elements in different Figs, have identical reference numerals.
  • Fig. 1 a shows a disc-shaped record carrier 1 having a track 9 and a central hole 10.
  • the track 9 is arranged in accordance with a spiral pattern of turns constituting substantially parallel tracks on an information layer.
  • the record carrier may be an optical disc having an information layer of a recordable type or of a prerecorded type. Examples of a recordable disc are the CD-R and CD-RW, and the DVD+RW, whereas the audio CD or the DVD video are examples of prerecorded discs.
  • the prerecorded type can be manufactured in a well known way by first recording a master disc and via intermediate steps subsequently pressing consumer discs.
  • the track 9 on the recordable type of record carrier is indicated by a pre-embossed track structure provided during manufacture of the blank record carrier, for example a pregroove.
  • the information is represented on the information layer by optically detectable marks recorded along the track.
  • the marks are constituted by variations of a first physical parameter and thereby have different optical properties or magnetic direction than their surroundings, e.g. variations in height called pits and lands on a CD.
  • Fig. lb is a cross-section taken along the line b-b of the record carrier 1 of the recordable type, in which a transparent substrate 5 is provided with a recording layer 6 and a protective layer 7.
  • the track structure is constituted, for example, by a pregroove 4 which enables a read/write head to follow the track 9 during scanning.
  • the pregroove 4 may be implemented as an indentation or an elevation, or may consist of a material having a different optical property than the surrounding material.
  • the pregroove track enables a read/write head to follow the track 9 during scanning.
  • a track structure may also be formed by regularly spread servo marks which periodically cause servo signals to occur.
  • the record carrier may carry real-time information, for example video or audio information, or other information, such as computer data.
  • Figs, lc and Id show two examples of variations of a parameter of the track.
  • Fig. lc shows a periodic variation of the lateral position of the track, also called wobble.
  • Fig. Id shows a variation of the width of the track.
  • the variations cause an additional signal to arise in the read head, e.g. in a servo tracking detector, of a recorder.
  • the wobble is, for example, frequency modulated and disc information is encoded in the modulation.
  • a comprehensive description of a writable CD system comprising disc information encoded in such a manner can be found in US 4,901,300 (PHN 12.398).
  • the track as schematically drawn in Fig. lc is constituted by a series of pits, and the wobble of the track in that case is the periodic variation of the lateral position of the pits.
  • Fig. le shows tracks on the record carrier and positions of the spots. Three tracks are shown at a track pith of P.
  • the track 9 comprises optical marks 11, and the pregroove 4 has the wobble.
  • a center spot 13 is centered on the middle track, and a leading spot 14 is displaced a distance Q to the side and a distance L along the track.
  • the distance Q is preferably V of the track pitch P, which gives the maximum modulation of the wobble when using 3 spot CA tracking, the common central aperture tracking system.
  • a lagging spot 12 is displaced a same distance Q to the other side, and again L from the center spot 13, the total distance between the leading spot 14 and the lagging spot 12 being W.
  • Fig. 2 shows a wobble detector.
  • the signal SI detected from the leading spot 14 is converted to a digital signal by A/D converter 21.
  • the signal S2 detected from the lagging spot 12 is converted to a digital signal by A/D converter 22.
  • the converted SI signal is coupled to a delay unit 23.
  • the delay may be fixed to a value corresponding to the distance and fixed scanning speed.
  • the delay unit 23 is adjustable and can be set to a variable delay by a clock signal from a scanning speed detection unit. Further the delay factor may be selected in dependence of the record carrier type, e.g. if a different wobble frequency is used for different record carrier types.
  • the delayed SI signal and the S2 signal are combined to a single wobble signal 26 by combination unit 27, e.g.
  • the wobble signal 26 may be coupled to a wobble demodulator 24 for deriving information encoded in the wobble.
  • the wobble signal 26 is also coupled to a phase locked loop (PLL) 25 for generating a clock signal corresponding to the wobble frequency.
  • PLL phase locked loop
  • the PLL clock signal is coupled to the delay unit 23 for setting the variable delay.
  • the PLL functions as scanning speed detection unit, and the delay now varies with the detected wobble frequency. Hence the leading signal SI and the lagging signal S2 are matched in time at any relative speed of the spots relative to the track.
  • the demodulator 24 may be coupled to the PLL clock for synchronous demodulation.
  • Fig. 3 shows a wobble detector with a HF PLL.
  • the signal SI detected from the leading spot 14 is converted to a digital signal by A/D converter 21.
  • the signal S2 detected from the lagging spot 12 is converted to a digital signal by A/D converter 22.
  • the converted SI signal is coupled to a delay unit 23.
  • the delay may be fixed to a value corresponding to the distance and fixed scanning speed.
  • the delay unit 23 is adjustable and can be set to a variable delay by a clock signal from a scanning speed detection unit.
  • the delayed SI signal and the S2 signal are combined to a single wobble signal 26 by combination unit 27, e.g. a subtractor.
  • the wobble signal 26 may be coupled to a wobble demodulator 24 for deriving information encoded in the wobble.
  • the detection signals S1+S2 are also coupled to a high frequency phase locked loop (HF PLL) 31 for generating a clock signal corresponding to the bit clock frequency of the optical marks.
  • the HF PLL clock signal is coupled to the delay unit 23 for setting the variable delay.
  • the HF PLL functions as scanning speed detection unit, and the delay now varies with the detected data frequency. Hence the leading signal S 1 and the lagging signal S2 are matched in time at any relative speed of the spots relative to the track.
  • Fig. 4 shows a wobble detector using alternating sampling.
  • the signal SI detected from the leading spot 14 is filtered by low pass filter 41.
  • the signal S2 detected from the lagging spot 12 is filtered by low pass filter 42.
  • the low pass filter bandwidth is adapted to the wobble frequency, for example 50 kHz for a 22 kHz wobble.
  • the filtered signals SI and S2 are sampled alternatingly via a switch 43 by A/D converter 47.
  • the switch 43 is controlled by a counter 45, which counts a number of pulses from the PLL 44.
  • the PLL frequency is indicative of the scanning speed, and may be fixed or locked to the HF or wobble frequency like in Figs. 2 or 3.
  • the delay between the samples of SI and S2 can be fine-adjusted by presetting the counter to a value corresponding to the number of clock pulses.
  • On the output of A/D converter 47 is coupled to a wobble detector 48.
  • On the output the samples of SI and S2 do alternate, e.g. the even samples being SI and the odd samples being S2.
  • the wobble detector 48 the digital signals of SI and S2 are processed as follows. The samples are combined, e.g. subtracted, for detecting the wobble signal.
  • the even sample n corresponds to the same tangential position along the track as the odd sample n-k, k being an odd integer.
  • the value of the parameter k is a coarse setting of the delay.
  • the total delay can be set by selecting k and setting the counter.
  • Figs. 5 and 6 show apparatuses according to the invention for scanning a record carrier 1.
  • the apparatus of Fig. 5 is arranged for reading the record carrier 1, which record carrier is identical to the record carriers shown in Fig. 1.
  • the device is provided with read means comprising a read head 52 for scanning the track on the record carrier, a drive unit 55 for rotating the record carrier 1 , a reading unit 53 for example comprising a channel decoder and an error corrector, a tracking unit 51 and a system control unit 56.
  • the read head comprises an optical system of a known type for generating a radiation spot 66 focused on a track of the recording layer of the record carrier via a radiation beam 65 guided through optical elements.
  • the radiation beam 65 is generated by a radiation source, e.g. a laser diode.
  • the read head further comprises a focusing actuator for focusing the radiation beam 65 on the recording layer and a tracking actuator 59 for fine positioning of the spot 66 in radial direction on the center of the track.
  • the tracking actuator 59 may comprise coils for radially moving an optical element or may be arranged for changing the angle of a reflecting element on a movable part of the read head or on a part on a fixed position in the case part of the optical system is mounted on a fixed position.
  • the radiation reflected by the recording layer is detected by a detector of a usual type, e.g. a four-quadrant diode, for generating a detector signals 57 including a read signal, a tracking error and a focusing error signal.
  • the apparatus is provided with a tracking unit 51 coupled to the read head for receiving the tracking error signal from the read head and controlling the tracking actuator 59.
  • the tracking unit may for example bet>f the differential phase detection (DPD) type, in which the deviation of the read head in relation to the centerline of the track is detected from phase differences which occur between signals from subdetectors when scanning a mark (e.g. a pit) in the track.
  • the tracking unit may be of the well known push- pull type, in which said deviation is detected based on detector signals from the left and right side of the track.
  • the read signal is converted into output information, indicated by arrow 64, in the reading unit 53.
  • the reading unit 53 comprises data processing of a controllable type, which are to be controlled based on a code from the record carrier, for example access control may be performed based on the code retrieved from the record carrier.
  • the apparatus has positioning means 54 for coarsely positioning the read head 52 in the radial direction on the track, the fine positioning being performed by the tracking actuator 59.
  • the apparatus is provided with a wobble detector 50 for detecting the wobble from the detector signals 57.
  • the wobble detector 50 is described above with reference to Figs. 2, 3 and 4.
  • the detector 50 may further comprise demodulator means for demodulating the code when scanning a code track that comprises a modulation pattern.
  • the device is further provided with a control unit 56 for receiving commands from a controlling computer system or from a user and for controlling the apparatus via control lines 58, e.g. a system bus connected to the drive unit 55, the positioning means 54, the wobble detector 50, the tracking unit 51 and the reading unit 53.
  • the control unit comprises control circuitry, for example a microprocessor, a program memory and control gates, for performing the procedures described below.
  • the control unit 56 may also be implemented as a state machine in logic circuits.
  • the control unit 56 may be arranged for retrieving addresses or a code from the track via the wobble detector 50, and for controlling the type of data processing in the reading unit 53.
  • the code may be a de- scramble key, which is used for decrypting copy protected video information.
  • Fig. 6 shows a device for writing information on a record carrier according to the invention of a type which is (re)writable in, for example a magneto-optical or optical manner (via phase change or dye) by means of a beam 65 of electromagnetic radiation.
  • the device is usually also equipped for reading and comprises the same elements as the apparatus for reading described above with Fig. 5, except that it comprises write means which include a write/read head 62 and a write signal processing unit 60, which comprises for example a formatter, an error encoder and a channel encoder.
  • the write/read head 62 has the same function as the read head 52 together with a write function and is coupled to the write signal processing unit 60.
  • the information presented to the input of the write signal processing unit 60 (indicated by the arcow 63) is distributed over logical and physical sectors according to formatting and encoding rules and converted into a write signal 61 for the write/read head 62.
  • the system control unit 56 is arranged for controlling the write signal processing unit 60 and for performing the position information recovery and positioning procedure as described above for the reading apparatus.
  • marks representing the information are formed on the record carrier.
  • Writing and reading of information for recording on optical discs and usable formatting, error conecting and channel coding rules are well-known in the art, e.g. from the CD system.
  • the wobble detecting means 50 are arranged for detecting the wobble as described above with reference to Figs. 2,3 and 4.
  • a data clock is used to control the write signal processing unit 60 and/or the reading unit 53.
  • Data clock generation means can be controlled by the system control unit 56 based on the radial position, e.g. on a zone and the rotation rate of the disc, and/or may be locked to the wobble.
  • any other suitable parameter of the track may be modulated, e.g. the track width.
  • an optical disc has been described, but other media, such as an optical card or tape, may be used. It is noted, that in this document the word 'comprising' does not exclude the presence of other elements or steps than those listed and the word 'a' or 'an' preceding an element does not exclude the presence of a plurality of such elements, that any reference signs do not limit the scope of the claims, that the invention may be implemented by means of both hardware and software, and that several 'means' may be represented by the same item of hardware. Further, the scope of the invention is not limited to the embodiments, and the invention lies in each and every novel feature or combination of features described above.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

Dispositif pour balayer un support d'enregistrement comportant une piste oscillante destinée à l'enregistrement ou la lecture de marques d'informations. Le système de balayage comprend une tête pour émettre des faisceaux de rayonnement formant un point principal, centré sur la piste, et un point satellite en avance ainsi qu'un point satellite en retard, les deux points satellites étant opposés l'un à l'autre, le point satellite en avance étant placé à une distance inter-satellites en aval du point en avance. Un détecteur génère un signal principal, un signal en avance et un signal en retard à partir du rayonnement reçu à travers la piste. Une unité de détection récupère les informations à partir de l'élément oscillant au moyen d'un signal combiné sur la base du signal en avance et du signal en retard. L'unité de détection comprend une unité de retardement destinée à générer le signal en avance, retardé sensiblement pour le temps nécessaire au déplacement de la piste à la vitesse de balayage sur la distance entre les satellites. Le signal en avance retardé et le signal en retard sont soustraits pour générer le signal combiné, et les perturbations causées par les marques d'informations sont réduites.
PCT/IB2002/004472 2001-11-30 2002-10-24 Dispositif pour balayer un support d'enregistrement optique WO2003046895A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002339619A AU2002339619A1 (en) 2001-11-30 2002-10-24 Device for scanning optical record carrier

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP01204623.1 2001-11-30
EP01204623 2001-11-30

Publications (2)

Publication Number Publication Date
WO2003046895A2 true WO2003046895A2 (fr) 2003-06-05
WO2003046895A3 WO2003046895A3 (fr) 2003-10-09

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PCT/IB2002/004472 WO2003046895A2 (fr) 2001-11-30 2002-10-24 Dispositif pour balayer un support d'enregistrement optique

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AU (1) AU2002339619A1 (fr)
TW (1) TW200406755A (fr)
WO (1) WO2003046895A2 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5909412A (en) * 1996-11-27 1999-06-01 Sharp Kabushiki Kaisha Method for reproducing optical disk
JP2000357326A (ja) * 1999-06-14 2000-12-26 Ricoh Co Ltd 光ピックアップ装置
EP1098302A2 (fr) * 1999-11-03 2001-05-09 SAMSUNG ELECTRONICS Co. Ltd. Procédé d'adressage de données d'identification physique utilisant des signaux oscillants, circuit de codage d'adresses oscillantes, procédé et circuit de détection d'adresses oscillantes, et support d'enregistrement
EP1241669A2 (fr) * 2001-03-13 2002-09-18 Pioneer Corporation Appareil de reproduction d'information, appareil de traitement de signaux, méthode de reproduction d'information, et support d'enregistrement optique

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3228403B2 (ja) * 1996-05-15 2001-11-12 シャープ株式会社 光ディスク記録再生装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5909412A (en) * 1996-11-27 1999-06-01 Sharp Kabushiki Kaisha Method for reproducing optical disk
JP2000357326A (ja) * 1999-06-14 2000-12-26 Ricoh Co Ltd 光ピックアップ装置
EP1098302A2 (fr) * 1999-11-03 2001-05-09 SAMSUNG ELECTRONICS Co. Ltd. Procédé d'adressage de données d'identification physique utilisant des signaux oscillants, circuit de codage d'adresses oscillantes, procédé et circuit de détection d'adresses oscillantes, et support d'enregistrement
EP1241669A2 (fr) * 2001-03-13 2002-09-18 Pioneer Corporation Appareil de reproduction d'information, appareil de traitement de signaux, méthode de reproduction d'information, et support d'enregistrement optique

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 03, 27 February 1998 (1998-02-27) -& JP 09 305976 A (SHARP CORP), 28 November 1997 (1997-11-28) *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 15, 6 April 2001 (2001-04-06) -& JP 2000 357326 A (RICOH CO LTD), 26 December 2000 (2000-12-26) *

Also Published As

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WO2003046895A3 (fr) 2003-10-09
AU2002339619A8 (en) 2003-06-10
TW200406755A (en) 2004-05-01
AU2002339619A1 (en) 2003-06-10

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