WO1990012394A1 - Circuit pour le dispositif de balayage optique d'un appareil optique d'enregistrement et de reproduction - Google Patents

Circuit pour le dispositif de balayage optique d'un appareil optique d'enregistrement et de reproduction Download PDF

Info

Publication number
WO1990012394A1
WO1990012394A1 PCT/EP1990/000360 EP9000360W WO9012394A1 WO 1990012394 A1 WO1990012394 A1 WO 1990012394A1 EP 9000360 W EP9000360 W EP 9000360W WO 9012394 A1 WO9012394 A1 WO 9012394A1
Authority
WO
WIPO (PCT)
Prior art keywords
elevations
depressions
circuit
optical
optical recording
Prior art date
Application number
PCT/EP1990/000360
Other languages
German (de)
English (en)
Inventor
Friedhelm Zucker
Christian Büchler
Original Assignee
Deutsche Thomson-Brandt Gmbh
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
Priority claimed from DE3911525A external-priority patent/DE3911525A1/de
Application filed by Deutsche Thomson-Brandt Gmbh filed Critical Deutsche Thomson-Brandt Gmbh
Publication of WO1990012394A1 publication Critical patent/WO1990012394A1/fr

Links

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
    • G11B7/0945—Methods for initialising servos, start-up sequences
    • 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
    • G11B7/08517—Methods for track change, selection or preliminary positioning by moving the head with tracking pull-in only

Definitions

  • the invention relates to a circuit for an optical scanning device of an optical recording and / or reproducing device, which scans data which are optically stored in depressions or elevations of a data track in the form of pits on an optical recording medium.
  • An optical recording medium for example a CD, contains pre-embossed grooves each with depressions, also called “groove”, and elevations in between, also called “land”.
  • the information can be recorded in the wells or in the surveys in the form of so-called pits. If the same player is now to be optionally suitable for recording media of different recording types, the information to be read can be recorded either in the depressions or in the elevations, depending on the type.
  • a tracking control circuit that regulates the Scanning beam along the track sections containing the information must be able to regulate either on the elevations or the depressions. This means that the tracking control circuit must be switched depending on the type of record carrier.
  • the invention is therefore based on the object of providing a simple circuit for switching over the tracking plane control circuit in the different types of recording media.
  • the control signal is thus switched in polarity by the inverter depending on which type of recording medium is recognized.
  • the data is first aimed at the elevations and checked whether the high-frequency useful signal is present at the output of the signal amplifier. If this is the case because the information to be read is stored in the elevations by means of the pits, the light beam remains directed at the elevations. If, on the other hand, the useful signal is missing at the output of the signal amplifier, the data in the depressions are stored in the form of the pits.
  • the tracking control circuit is therefore switched so that it now regulates the light beam on the depressions.
  • the test of the signal at the output of the signal amplifier for the presence of the high-frequency useful signal and the switching of the tracking control circuit, which may be necessary, can e.g. by means of a microprocessor.
  • the tracking control circuit is therefore automatically so by a manipulated variable depending on the type of record carrier switched that the scanning beam is regulated to the part of the track, that is, either to the depressions or the elevations where the useful signal is stored.
  • Fig. 1 shows the block diagram of a player for an optical
  • Fig. 2 shows the relationship between the control voltage and the
  • Fig. 3 is a detailed circuit diagram of the invention
  • the manipulated variable Us controls the inverter 10, which switches the polarity of the control voltage Ur obtained in the amplifier 4 for the servo control 6 depending on whether the In formation is recorded in the wells or elevations. Inverter 10 is controlled by selectively grounding the non-inverting "+" input.
  • the Servorege development 6 controls the track sequence via the actuator 2 such that the scanning beam is guided either along the depressions or along the elevations, depending on the type of recording medium.
  • Fig. 2 shows in the form of a track section side by side depressions G (groove) and elevations L (land).
  • the scanning beam has to be guided through the tracking curve control circuit along the depressions G, as is shown by the hatched scan.
  • the scanning beam must follow the elevations L by the tracking control circuit, as indicated by the scanning beam shown in broken lines.
  • the lower part of FIG. 2 shows that the control voltage Ur controlling the track sequence for the control of the symbolically indicated scanner 11 either on the recesses G or the elevations L has a phase different by 180 °, that is to say the polarity must be switched. This switchover is carried out by the inverter 10.
  • FIG. 3 shows the detailed circuit of the inverter 10.
  • the control voltage Ur to be switched in polarity is applied from the terminal 12 via the resistors R1 and R3 to the inverting and the non-inverting input of the differential amplifier 13.
  • the output 14 of the differential amplifier 13 is connected to the inverting input via the resistor R2, which represents a negative feedback.
  • the field effect transistor 15 Between the non-inverting input and ground is the field effect transistor 15, to whose control electrode the manipulated variable Us from terminal 16 is applied.
  • the non-inverted or the inverted control voltage Ur for the servo circuit 6 can be removed.
  • the circuit works as follows:
  • Differential amplifier 13 type - MC1458

Landscapes

  • Optical Recording Or Reproduction (AREA)

Abstract

Un support d'enregistrement optique, par exemple un CD, comporte des sillons prégravés, formant des creux (en anglais ''groove''), et, entre ces creux, des élévations (en anglais ''land''). L'information peut être enregistrée sous forme de ''pits'', soit dans les creux, soit dans les élévations. Afin de diriger le faisceau lumineux qui balaye les données sur la partie de la piste qui porte les pits, qu'elle soit groove ou land, on inverse automatiquement un signal de poursuite dynamique de piste (Ur). On fait passer ce signal (Ur) par un amplificateur d'inversion, qui est inversé via un transistor à effet de champ (15) en fonction d'une valeur réglante (Us) caractéristique du type de support. Application: lecteurs de CD, magnétoscopes à disque, appareils magnéto-optiques, lecteurs de disques DRAW.
PCT/EP1990/000360 1989-04-08 1990-03-03 Circuit pour le dispositif de balayage optique d'un appareil optique d'enregistrement et de reproduction WO1990012394A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3911525A DE3911525A1 (de) 1988-11-17 1989-04-08 Schaltung zur erkennung des typs eines optischen aufzeichnungstraegers
DEP3911525.9 1989-04-08

Publications (1)

Publication Number Publication Date
WO1990012394A1 true WO1990012394A1 (fr) 1990-10-18

Family

ID=6378223

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1990/000360 WO1990012394A1 (fr) 1989-04-08 1990-03-03 Circuit pour le dispositif de balayage optique d'un appareil optique d'enregistrement et de reproduction

Country Status (4)

Country Link
KR (1) KR920700446A (fr)
CN (1) CN1046239A (fr)
AU (1) AU5175590A (fr)
WO (1) WO1990012394A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0588305A2 (fr) * 1992-09-14 1994-03-23 Matsushita Electric Industrial Co., Ltd. Milieu d'enregistrement d'informations optique et appareil d'enregistrement et de reproduction d'informations optiques
EP1030293A2 (fr) * 1991-06-04 2000-08-23 International Business Machines Corporation Support de stockage optique avec surfaces de données multiples et système de stockage de données

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan, Band 11, Nr 378, P645, Zusammenfassung von JP 62-146440, publ 1987-06-30 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1030293A2 (fr) * 1991-06-04 2000-08-23 International Business Machines Corporation Support de stockage optique avec surfaces de données multiples et système de stockage de données
EP1030293A3 (fr) * 1991-06-04 2000-12-06 International Business Machines Corporation Support de stockage optique avec surfaces de données multiples et système de stockage de données
EP1304688A2 (fr) * 1991-06-04 2003-04-23 International Business Machines Corporation Système de stockage optique des données
EP1304688A3 (fr) * 1991-06-04 2006-09-06 Mitsubishi Denki Kabushiki Kaisha Système de stockage optique des données
EP0588305A2 (fr) * 1992-09-14 1994-03-23 Matsushita Electric Industrial Co., Ltd. Milieu d'enregistrement d'informations optique et appareil d'enregistrement et de reproduction d'informations optiques
EP0588305A3 (en) * 1992-09-14 1996-01-03 Matsushita Electric Ind Co Ltd Optical information recording medium and optical information recording/reproducing apparatus
US5616390A (en) * 1992-09-14 1997-04-01 Matsushita Electric Industrial Co., Ltd. Optical recording medium permitting detection of identification signals in land areas and groove areas, optical information recording/reproducing apparatus and apparatus for producing an original disk for forming a disk substrate

Also Published As

Publication number Publication date
AU5175590A (en) 1990-11-05
CN1046239A (zh) 1990-10-17
KR920700446A (ko) 1992-02-19

Similar Documents

Publication Publication Date Title
DE3687274T2 (de) Spurnachlaufverfahren fuer optische speicherplatte.
DE69110533T2 (de) Optisches Plattenaufzeichnungsgerät.
DE3025059C2 (de) Verfahren zum Einstellen eines Abnehmerkopfes auf eine durch eine vorgegebene Adresse bestimmte Spur eines rotierenden Aufzeichnungsträgers und Einrichtung zur Durchführung des Verfahrens
DE3340712A1 (de) Spurhalteschaltung fuer optische wiedergabegeraete
DE3722568A1 (de) Vorrichtung zur optischen informationsverarbeitung
DE69317831T2 (de) Wiedergabegerät
DE68920250T2 (de) Spursignal in einem optischen Informationsaufzeichnungs- und/oder -wiedergabegerät.
DE3322456A1 (de) Spurfolgendes servogeraet
DE3887601T2 (de) Informationsaufnahme- und/oder -wiedergabegerät mit Mitteln zur Feststellung aller Spurfolgefehler.
DE69701545T2 (de) Plattenunterscheidungsgerät für ein optisches Plattenwiedergabegerät
DE69713316T2 (de) Servobetrieb für spurverfolgung mit geschlossener regelschleife
DE3780866T2 (de) Optisches informations-aufzeichnungs- und wiedergabegeraet.
DE3830745A1 (de) Verfahren und vorrichtung fuer optische datenaufzeichnung/wiedergabe
DE3601265A1 (de) Optisches system fuer informationsaufzeichnung
DE69514431T2 (de) Magnetoresistives herausnehmbares Festplattenmagazin und Plattenantrieb und eingebettete Quadraturservobursts
DE2805323C2 (de) Drehbarer Informationssignal-Aufzeichnungsträger und Aufzeichnungsanordnung für den Aufzeichnungsträger
EP0303646B1 (fr) Instrument permettant la restitution de donnees
DE69319773T2 (de) Magnetkopfverwendende magneto-optische Informationsaufnahme und -wiedergabegerät und -verfahren
DE3503983A1 (de) Fokus-regelung fuer ein geraet fuer plattenfoermige, rotierende informationstraeger
WO1990012394A1 (fr) Circuit pour le dispositif de balayage optique d'un appareil optique d'enregistrement et de reproduction
DE69321321T2 (de) Spurfolgeservoschaltungen
DE3821811C2 (fr)
DE69825022T2 (de) Plattenförmiger informationsträger mit zwei teilen jeweils verrschiedener wiedergabegeschwindigkeiten
DE3913992C2 (fr)
DE69934541T2 (de) Gerät zur Wiedergabe oder Aufzeichnung von Daten oder Informationen

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AU BG BR DK FI HU JP KP KR LK MC MG MW NO RO SD SU US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB IT LU NL SE