Processing

Please wait...

Settings

Settings

1. WO2000039793 - OPTICAL RECORDING/REPRODUCING DEVICE HAVING A SYSTEM FOR THE REDUCTION OF LASER NOISE WHEN READING DATA FROM THE RECORD CARRIER

Publication Number WO/2000/039793
Publication Date 06.07.2000
International Application No. PCT/EP1999/010067
International Filing Date 14.12.1999
IPC
G11B 7/005 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power; Record carriers therefor
004Recording, reproducing or erasing methods; Read, write or erase circuits therefor
005Reproducing
G11B 11/105 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
11Recording on, or reproducing from, the same record carrier wherein for these two operations the methods or means are covered by different main groups of groups G11B3/-G11B7/212; Record carriers therefor
10using recording by magnetisation or demagnetisation
105using a beam of light or a magnetic field for recording and a beam of light for reproducing, e.g. light-induced thermo-magnetic recording, Kerr effect reproducing
G11B 19/04 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
19Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function
02Control of operating function, e.g. switching from recording to reproducing
04Arrangements for preventing, inhibiting, or warning against, double recording on the same blank, or against other recording or reproducing malfunctions
G11B 7/125 2012.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power; Record carriers therefor
12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
125Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
H01S 3/13 2006.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
10Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
13Stabilisation of laser output parameters, e.g. frequency, amplitude
CPC
G11B 11/10515
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
11Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
10using recording by magnetic means ; or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
105using a beam of light or a magnetic field for recording ; by change of magnetisation; and a beam of light for reproducing, ; i.e. magneto-optical,; e.g. light-induced thermo-magnetic recording, ; spin magnetisation recording,; Kerr ; or Faraday; effect reproducing
10502characterised by the transducing operation to be executed
10515Reproducing
G11B 11/10595
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
11Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
10using recording by magnetic means ; or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
105using a beam of light or a magnetic field for recording ; by change of magnetisation; and a beam of light for reproducing, ; i.e. magneto-optical,; e.g. light-induced thermo-magnetic recording, ; spin magnetisation recording,; Kerr ; or Faraday; effect reproducing
10595Control of operating function
G11B 19/04
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
19Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function
02Control of operating function, e.g. switching from recording to reproducing
04Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions
G11B 7/126
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7Recording 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;
12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
125Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
126Circuits, methods or arrangements for laser control or stabilisation
H01S 3/13
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
10Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
13Stabilisation of laser output parameters, e.g. frequency, amplitude
Applicants
  • KONINKLIJKE PHILIPS ELECTRONICS N.V. [NL/NL]; Groenewoudseweg 1 NL-5621 5621 BA Eindhoven, NL
Inventors
  • IMMINK, Albert, H., J.; NL
  • DIJKMANS, Eise, C.; NL
  • VAN DEN HOMBERG, Johannes, A., T., M.; NL
Agents
  • DE JONG, Durk, J.; Internationaal Octroibureau B.V. Prof. Holstlaan 6 NL-5656 AA Eindhoven, NL
Priority Data
98204434.924.12.1998EP
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) OPTICAL RECORDING/REPRODUCING DEVICE HAVING A SYSTEM FOR THE REDUCTION OF LASER NOISE WHEN READING DATA FROM THE RECORD CARRIER
(FR) DISPOSITIF D'ENREGISTREMENT/LECTURE OPTIQUE POURVU D'UN SYSTEME DE DIMINUTION DU BRUIT LASER LORS DE LA LECTURE DE DONNEES DANS LE SUPPORT D'ENREGISTREMENT
Abstract
(EN)
The device described has a first operational state for writing information onto a record carrier (1) and a second operational state for reading information from a record carrier (1). The device comprises a phase-locked loop (3-6) for generating a clock signal (CL) from a reference signal (SCL). The device further comprises a control unit (7) for generating a pulsed transducer control signal (Str) in response to an information signal (Sinfo) and the clock signal (CL). The device also comprises a transducer (10) for generating physically detectable patterns in the record carrier (1) in response to the transducer control signal (Str). The device also comprises a transducer (10) for generating a read signal (Sls) in response to physically detectable patterns in the record carrier (1) in the second operational state. The transducer (10) for generating the read signal (Sls) comprises a radiation source (11). The device further comprises a power supply (7) which supplies the radiation source (11) with an electric power. The phase-locked loop (3-6) comprises memory means (12) for memorizing, in the first operational state, a memory value which is a measure of the supplied clock signal (CL). In the second operational state, the phase-locked loop (3-6) generates the clock signal (CL) in response to the memorized memory value and causes a high-frequency modulation in the electric power supplied by the power supply (7).
(FR)
Ce dispositif possède un premier état de fonctionnement, écriture de données dans un support d'enregistrement (1), et un second état de fonctionnement, lecture de données dans un support d'enregistrement (1). Il comporte une boucle à phase asservie (3-6), destinée à produire un signal d'horloge (CL) à partir d'un signal de référence (SCL), et une unité de commande (7) produisant un signal impulsionnel de commande de transducteur (Str) en réaction à un signal d'information (Sinfo) et au signal d'horloge. Il comporte, en outre, un transducteur (10) produisant des configurations détectables physiquement dans le support d'enregistrement (1) en réaction au signal de commande du transducteur (Str) et un transducteur (10) produisant un signal de lecture (Sls) en réaction aux configurations détectables physiquement présentes dans le support d'enregistrement (1) et ce, lorsqu'il se trouve dans le second état de fonctionnement. Le transducteur (10) servant à produire un signal de lecture possède une source de rayonnement (11). Ce dispositif est également équipé d'une alimentation en énergie (7) fournissant du courant électrique à la source de rayonnement (11). La boucle à phase asservie (3-6) est dotée d'une mémoire (12) stockant, dans le premier état de fonctionnement, une valeur de mémoire qui est une mesure du signal d'horloge fourni (CL). Dans le second état de fonctionnement, la boucle à phase asservie (3-6) produit le signal d'horloge (CL) en réaction à la valeur de mémoire stockée et provoque une modulation haute fréquence du courant électrique fourni par l'alimentation en énergie (7).
Latest bibliographic data on file with the International Bureau