FR2385171A1 - Dispositif pour la lecture d'un porteur d'enregistrement reflechissant du rayonnement - Google Patents

Dispositif pour la lecture d'un porteur d'enregistrement reflechissant du rayonnement

Info

Publication number
FR2385171A1
FR2385171A1 FR7808294A FR7808294A FR2385171A1 FR 2385171 A1 FR2385171 A1 FR 2385171A1 FR 7808294 A FR7808294 A FR 7808294A FR 7808294 A FR7808294 A FR 7808294A FR 2385171 A1 FR2385171 A1 FR 2385171A1
Authority
FR
France
Prior art keywords
radiation
astigmatic
reading
detectors
record holder
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.)
Pending
Application number
FR7808294A
Other languages
English (en)
French (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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of FR2385171A1 publication Critical patent/FR2385171A1/fr
Pending 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)
  • Optical Head (AREA)
FR7808294A 1977-03-22 1978-03-22 Dispositif pour la lecture d'un porteur d'enregistrement reflechissant du rayonnement Pending FR2385171A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7703076A NL7703076A (nl) 1977-03-22 1977-03-22 Inrichting voor het uitlezen van een stralings- reflekterende registratiedrager.

Publications (1)

Publication Number Publication Date
FR2385171A1 true FR2385171A1 (fr) 1978-10-20

Family

ID=19828205

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7808294A Pending FR2385171A1 (fr) 1977-03-22 1978-03-22 Dispositif pour la lecture d'un porteur d'enregistrement reflechissant du rayonnement

Country Status (20)

Country Link
JP (1) JPS53117403A (pt)
AR (1) AR214353A1 (pt)
AT (1) AT369580B (pt)
AU (1) AU510218B2 (pt)
BE (1) BE865083A (pt)
BR (1) BR7801690A (pt)
CA (1) CA1109560A (pt)
CH (1) CH627016A5 (pt)
DE (1) DE2810616A1 (pt)
DK (1) DK145868C (pt)
ES (1) ES468055A1 (pt)
FR (1) FR2385171A1 (pt)
IT (1) IT1093316B (pt)
MX (1) MX143603A (pt)
NL (1) NL7703076A (pt)
NZ (1) NZ186732A (pt)
PL (1) PL113996B1 (pt)
SE (1) SE424676B (pt)
YU (1) YU39193B (pt)
ZA (1) ZA78216B (pt)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2390749A1 (fr) * 1977-05-11 1978-12-08 Pioneer Electronic Corp Appareil d'asservissement de la focalisation d'un ensemble de lecture d'informations
FR2460022A1 (fr) * 1979-06-25 1981-01-16 Hitachi Ltd Systeme optique de reproduction d'informations
EP0156418A1 (en) * 1984-03-02 1985-10-02 Koninklijke Philips Electronics N.V. Apparatus for recording and/or reading information in/from a track of a reflecting record carrier, which apparatus comprises a focusing control system with reduced spot-offset sensitivity
FR2601173A1 (fr) * 1986-07-01 1988-01-08 Sanyo Electric Co Tete de lecture optique pour disques numeriques.

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7907216A (nl) * 1979-09-28 1981-03-31 Philips Nv Optisch fokusfout-detektiestelsel.
JPS59125727U (ja) * 1983-02-15 1984-08-24 パイオニア株式会社 光学式情報ピツクアツプ装置
JPS6139942A (ja) * 1984-08-01 1986-02-26 Matsushita Electric Ind Co Ltd 光ピツクアツプ
US4609813A (en) * 1985-03-18 1986-09-02 International Business Machines Corporation Optical systems employing ovate light beams
DE3828146A1 (de) * 1988-08-19 1990-02-22 Philips Patentverwaltung Elektrodynamischer aktuator fuer eine optische einschreib- und ausleseeinheit

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
FR2317727A1 (fr) * 1975-07-07 1977-02-04 Philips Nv Dispositif pour la lecture d'un porteur d'enregistrement presentant une structure d'information reflectrice lisible par voie optique
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

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5337722A (en) * 1976-09-20 1978-04-07 Ebata Shiyouji Kk Method of producing concrete piles

Patent Citations (6)

* 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
FR2271590A1 (pt) * 1974-01-15 1975-12-12 Thomson Brandt
FR2317727A1 (fr) * 1975-07-07 1977-02-04 Philips Nv Dispositif pour la lecture d'un porteur d'enregistrement presentant une structure d'information reflectrice lisible par voie optique
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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2390749A1 (fr) * 1977-05-11 1978-12-08 Pioneer Electronic Corp Appareil d'asservissement de la focalisation d'un ensemble de lecture d'informations
FR2460022A1 (fr) * 1979-06-25 1981-01-16 Hitachi Ltd Systeme optique de reproduction d'informations
EP0156418A1 (en) * 1984-03-02 1985-10-02 Koninklijke Philips Electronics N.V. Apparatus for recording and/or reading information in/from a track of a reflecting record carrier, which apparatus comprises a focusing control system with reduced spot-offset sensitivity
FR2601173A1 (fr) * 1986-07-01 1988-01-08 Sanyo Electric Co Tete de lecture optique pour disques numeriques.

Also Published As

Publication number Publication date
AU510218B2 (en) 1980-06-12
DE2810616A1 (de) 1978-09-28
MX143603A (es) 1981-06-05
DK145868B (da) 1983-03-21
NZ186732A (en) 1981-02-11
YU67378A (en) 1982-06-30
DK145868C (da) 1983-09-12
AT369580B (de) 1983-01-10
ATA196578A (de) 1982-05-15
CH627016A5 (en) 1981-12-15
ES468055A1 (es) 1978-11-16
SE424676B (sv) 1982-08-02
PL113996B1 (en) 1981-01-31
BE865083A (fr) 1978-09-20
CA1109560A (en) 1981-09-22
BR7801690A (pt) 1979-01-02
YU39193B (en) 1984-08-31
JPS53117403A (en) 1978-10-13
AU3429478A (en) 1979-09-27
SE7803138L (sv) 1978-09-23
NL7703076A (nl) 1978-09-26
AR214353A1 (es) 1979-05-31
IT7821340A0 (it) 1978-03-17
PL205453A1 (pl) 1978-12-18
ZA78216B (en) 1979-08-29
DK120578A (da) 1978-09-23
IT1093316B (it) 1985-07-19

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