FR2390749A1 - Appareil d'asservissement de la focalisation d'un ensemble de lecture d'informations - Google Patents

Appareil d'asservissement de la focalisation d'un ensemble de lecture d'informations

Info

Publication number
FR2390749A1
FR2390749A1 FR7814069A FR7814069A FR2390749A1 FR 2390749 A1 FR2390749 A1 FR 2390749A1 FR 7814069 A FR7814069 A FR 7814069A FR 7814069 A FR7814069 A FR 7814069A FR 2390749 A1 FR2390749 A1 FR 2390749A1
Authority
FR
France
Prior art keywords
light
focusing
condenser
cylindrical lens
information reading
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
FR7814069A
Other languages
English (en)
Other versions
FR2390749B1 (fr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pioneer Corp
Original Assignee
Pioneer Electronic Corp
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 JP5409577A external-priority patent/JPS53139508A/ja
Priority claimed from JP5742977A external-priority patent/JPS53142203A/ja
Application filed by Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Publication of FR2390749A1 publication Critical patent/FR2390749A1/fr
Application granted granted Critical
Publication of FR2390749B1 publication Critical patent/FR2390749B1/fr
Granted legal-status Critical Current

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
    • G11B7/0908—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
    • G11B7/0909—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 by astigmatic methods

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

L'invention concerne les appareils d'asservissement de focalisation. Elle se rapporte à un appareil ayant une source lumineuse, un condenseur destiné à focaliser la lumière de la source sur la surface d'un support d'enregistrement, et à focaliser la lumière réfléchie par la surface et contenant l'information enregistrée par cette dernière, et une lentille cylindrique destinée à transmettre la lumière réfléchie. Un élément photorécepteur 9 transmet un signal de sortie permettant l'asservissement par déplacement du condenseur 5. Selon l'invention, un point principal de la lentille cylindrique se trouve au voisinage du point de focalisation de la lumière réfléchie par le condenseur, l'axe de la lentille cylindrique faisant un angle d'environ 45 degrés avec la direction de déplacement du support d'enregistrement Application aux ensembles de lecture optique d'informations.
FR7814069A 1977-05-11 1978-05-11 Appareil d'asservissement de la focalisation d'un ensemble de lecture d'informations Granted FR2390749A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP5409577A JPS53139508A (en) 1977-05-11 1977-05-11 Focus servoodevice for optial information reader
JP5742977A JPS53142203A (en) 1977-05-18 1977-05-18 Focus servoodevice for optical information reader

Publications (2)

Publication Number Publication Date
FR2390749A1 true FR2390749A1 (fr) 1978-12-08
FR2390749B1 FR2390749B1 (fr) 1982-03-05

Family

ID=26394835

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7814069A Granted FR2390749A1 (fr) 1977-05-11 1978-05-11 Appareil d'asservissement de la focalisation d'un ensemble de lecture d'informations

Country Status (6)

Country Link
US (1) US4290132A (fr)
CA (1) CA1131361A (fr)
DE (1) DE2820482C2 (fr)
FR (1) FR2390749A1 (fr)
GB (1) GB1601275A (fr)
NL (1) NL177259B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0137272A2 (fr) * 1983-09-05 1985-04-17 Mitsubishi Denki Kabushiki Kaisha Dispositif de focalisation automatique

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5690434A (en) * 1979-12-19 1981-07-22 Hitachi Ltd Optical information reproducing device
JPS5744236A (en) * 1980-08-29 1982-03-12 Matsushita Electric Ind Co Ltd Optical information reproducer
JPS5774837A (en) * 1980-10-25 1982-05-11 Olympus Optical Co Ltd Signal detection system of optical information reproducing device
JPS57108811A (en) * 1980-12-26 1982-07-07 Hitachi Ltd Optical focus position detector
US4378491A (en) * 1981-01-26 1983-03-29 Lehman Thomas F Optical apparatus for sensing information from a phonograph record for controlling spacing and tracking of the pick-up relative to the record
JPS58200473A (ja) * 1982-05-19 1983-11-22 Pioneer Video Kk 情報読取装置
NL8300291A (nl) * 1983-01-27 1984-08-16 Philips Nv Inrichting voor het uitlezen van een optische registratiedrager.
JPS59191144A (ja) * 1983-04-14 1984-10-30 Sony Corp 光ピツクアツプのトラツキングサ−ボ回路
US4752922A (en) * 1984-07-06 1988-06-21 Storage Technology Partners 11 Optical disk recording and readout system having read, write and coarse light beams
US4677605A (en) * 1984-07-06 1987-06-30 Storage Technology Partners Ii Focus acquisition and maintenance for optical disk system
US4609813A (en) * 1985-03-18 1986-09-02 International Business Machines Corporation Optical systems employing ovate light beams
JPH0514334Y2 (fr) * 1986-10-01 1993-04-16
JPH01150234A (ja) * 1987-12-07 1989-06-13 Teac Corp 焦点サーボ装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2501124A1 (de) * 1974-01-15 1975-08-07 Thomson Brandt Fokussiereinrichtung
FR2325987A1 (fr) * 1975-09-29 1977-04-22 Thomson Brandt Dispositif de lecture optique d'un enregistrement
FR2356333A1 (fr) * 1976-06-25 1978-01-20 Hitachi Ltd Dispositif de focalisation automatique pour appareil optique de reproduction d'informations, notamment pour disque video
FR2385172A1 (fr) * 1977-03-22 1978-10-20 Philips Nv Dispositif pour la lecture d'un porteur d'enregistrement reflechissant le rayonnement
FR2385171A1 (fr) * 1977-03-22 1978-10-20 Philips Nv Dispositif pour la lecture d'un porteur d'enregistrement reflechissant du rayonnement

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3359056A (en) * 1964-09-21 1967-12-19 Perkin Elmer Corp Stable cylindrical lens systems
NL182990C (nl) * 1975-07-07 1988-06-16 Philips Nv Inrichting voor het uitlezen van een stralingsreflekterende registratiedrager.
FR2323160A1 (fr) * 1975-09-03 1977-04-01 Thomson Brandt Dispositif optique de projection et lecteur optique comportant un tel dispositif
FR2330062A1 (fr) * 1975-10-31 1977-05-27 Thomson Brandt Dispositif de recherche de focalisation et lecteur optique comportant un tel dispositif
US4025949A (en) * 1975-12-31 1977-05-24 Zenith Radio Corporation Symmetrical astigmatic focus sensing system
NL7708200A (nl) * 1976-07-28 1978-01-31 Hitachi Ltd Automatische scherpstellingsinrichting.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2501124A1 (de) * 1974-01-15 1975-08-07 Thomson Brandt Fokussiereinrichtung
FR2325987A1 (fr) * 1975-09-29 1977-04-22 Thomson Brandt Dispositif de lecture optique d'un enregistrement
FR2356333A1 (fr) * 1976-06-25 1978-01-20 Hitachi Ltd Dispositif de focalisation automatique pour appareil optique de reproduction d'informations, notamment pour disque video
FR2385172A1 (fr) * 1977-03-22 1978-10-20 Philips Nv Dispositif pour la lecture d'un porteur d'enregistrement reflechissant le rayonnement
FR2385171A1 (fr) * 1977-03-22 1978-10-20 Philips Nv Dispositif pour la lecture d'un porteur d'enregistrement reflechissant du rayonnement

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ABJP/78 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0137272A2 (fr) * 1983-09-05 1985-04-17 Mitsubishi Denki Kabushiki Kaisha Dispositif de focalisation automatique
EP0137272A3 (en) * 1983-09-05 1987-08-05 Mitsubishi Denki Kabushiki Kaisha Automatic focusing device

Also Published As

Publication number Publication date
DE2820482A1 (de) 1978-11-16
NL7805016A (nl) 1978-11-14
US4290132A (en) 1981-09-15
DE2820482C2 (de) 1983-08-25
NL177259B (nl) 1985-03-18
GB1601275A (en) 1981-10-28
CA1131361A (fr) 1982-09-07
FR2390749B1 (fr) 1982-03-05

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Legal Events

Date Code Title Description
ST Notification of lapse