FR2437043A1 - Dispositif pour la lecture d'un porteur d'enregistrement optique comportant une structure d'information reflechissant le rayonnement - Google Patents
Dispositif pour la lecture d'un porteur d'enregistrement optique comportant une structure d'information reflechissant le rayonnementInfo
- Publication number
- FR2437043A1 FR2437043A1 FR7923575A FR7923575A FR2437043A1 FR 2437043 A1 FR2437043 A1 FR 2437043A1 FR 7923575 A FR7923575 A FR 7923575A FR 7923575 A FR7923575 A FR 7923575A FR 2437043 A1 FR2437043 A1 FR 2437043A1
- Authority
- FR
- France
- Prior art keywords
- reading
- radiation
- information structure
- optical recording
- structure reflecting
- 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
Links
- 230000005855 radiation Effects 0.000 title abstract 5
- 230000003287 optical effect Effects 0.000 title abstract 3
- 230000002452 interceptive effect Effects 0.000 abstract 1
- PWPJGUXAGUPAHP-UHFFFAOYSA-N lufenuron Chemical compound C1=C(Cl)C(OC(F)(F)C(C(F)(F)F)F)=CC(Cl)=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F PWPJGUXAGUPAHP-UHFFFAOYSA-N 0.000 abstract 1
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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
-
- 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
-
- 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
- G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
-
- 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
- G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
- G11B2007/0924—Skewed beams methods (using an angled beam, i.e. a beam which is reflected from the disc at an angle different from 90°)
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
- Automatic Focus Adjustment (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
DISPOSITIF POUR LA LECTURE D'UN PORTEUR D'ENREGISTREMENT PRESENTANT UNE STRUCTURE D'INFORMATION REFLECHISSANT LE RAYONNEMENT OPTIQUE. DANS LE TRAJET DU FAISCEAU DE LECTURE EST INSEREE UNE PLAQUE A FACES PARALLELES, DONT LA SURFACE EST NOTABLEMENT PLUS PETITE QUE LA SECTION DU FAISCEAU DE LECTURE ET EMPECHE QUE LA PARTIE DE FAISCEAU TRAVERSANT LA PLAQUE N'INTERFERE AVEC LE RESTE DU FAISCEAU DE LECTURE. APRES REFLEXION PAR LE PORTEUR D'ENREGISTREMENT, LADITE PARTIE DE FAISCEAU TRAVERSE UN ELEMENT DE DEVIATION DE RAYONNEMENT, QUI DEVIE LA PARTIE DE FAISCEAU VERS DEUX DETECTEURS SENSIBLES A RAYONNEMENT. LA POSITION DE LA TACHE DE RAYONNEMENT FORMEE PAR LADITE PARTIE DE FAISCEAU EST PROPORTIONNELLE AU DEGRE DE FOCALISATION DU FAISCEAU DE LECTURE SUR LA STRUCTURE D'INFORMATION. APPLICATION: LECTURE OPTIQUE D'UN PORTEUR DE PROGRAMME VIDEO.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL7809635A NL7809635A (nl) | 1978-09-22 | 1978-09-22 | Inrichting voor het uitlezen van een optische registra- tiedrager bevattende een stralingsreflekterende infor- matiestruktuur. |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2437043A1 true FR2437043A1 (fr) | 1980-04-18 |
FR2437043B1 FR2437043B1 (fr) | 1985-07-12 |
Family
ID=19831595
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7923575A Expired FR2437043B1 (fr) | 1978-09-22 | 1979-09-21 | Dispositif pour la lecture d'un porteur d'enregistrement optique comportant une structure d'information reflechissant le rayonnement |
Country Status (17)
Country | Link |
---|---|
US (1) | US4253019A (fr) |
JP (1) | JPS5545200A (fr) |
AR (1) | AR223848A1 (fr) |
AU (1) | AU530291B2 (fr) |
BE (1) | BE878905A (fr) |
BR (1) | BR7905978A (fr) |
CA (1) | CA1123640A (fr) |
DD (1) | DD146118A5 (fr) |
DE (1) | DE2937427A1 (fr) |
DK (1) | DK391279A (fr) |
ES (1) | ES484316A1 (fr) |
FR (1) | FR2437043B1 (fr) |
GB (1) | GB2033187B (fr) |
IT (1) | IT1165709B (fr) |
NL (1) | NL7809635A (fr) |
SE (1) | SE437579B (fr) |
ZA (1) | ZA794547B (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0039836A2 (fr) * | 1980-05-12 | 1981-11-18 | Northern Telecom Limited | Tête de lecture pour un système à disque optique |
FR2538580A1 (fr) * | 1982-12-25 | 1984-06-29 | Pioneer Electronic Corp | Dispositif de lecture optique |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55153142A (en) * | 1979-05-15 | 1980-11-28 | Olympus Optical Co Ltd | Magnetic recording and reproducing device |
US4494226A (en) * | 1981-10-15 | 1985-01-15 | Burroughs Corporation | Three beam optical memory system |
US4402061A (en) * | 1981-10-15 | 1983-08-30 | Burroughs Corporation | Preformatted optical media for use in an optical memory system |
US4451914A (en) * | 1982-04-15 | 1984-05-29 | Burroughs Corporation | Optical storage system employing a multi-layer optical medium |
US4451915A (en) * | 1982-04-15 | 1984-05-29 | Burroughs Corporation | Optical storage system employing a multi-layer optical medium |
NL8202058A (nl) * | 1982-05-19 | 1983-12-16 | Philips Nv | Opto-elektronisch fokusfout-detektiestelsel. |
US4674076A (en) * | 1982-05-19 | 1987-06-16 | Burroughs Corporation | Optical memory system having improved positioning and focusing control circuitry |
US4669074A (en) * | 1982-05-19 | 1987-05-26 | Burroughs Corporation | Focusing control circuitry for an optical memory system |
GB2122835B (en) * | 1982-06-30 | 1986-08-06 | Eastman Kodak Co | Rangefinder |
GB2135150A (en) * | 1983-02-15 | 1984-08-22 | Gen Electric | Optical inspection system |
JPS59162514A (ja) * | 1983-03-08 | 1984-09-13 | Dainippon Screen Mfg Co Ltd | 画像走査記録装置における焦点調整方法 |
US4891799A (en) * | 1987-03-13 | 1990-01-02 | Fuji Electrochemical Co., Ltd. | Optical head apparatus for writing and reading data on an optical disk having a lens with an inclined optical axis |
JPH03225650A (ja) * | 1990-01-31 | 1991-10-04 | Sony Corp | 光ディスクシステム |
US5748598A (en) * | 1995-12-22 | 1998-05-05 | Massachusetts Institute Of Technology | Apparatus and methods for reading multilayer storage media using short coherence length sources |
US5757763A (en) * | 1994-07-12 | 1998-05-26 | Massachusetts Institute Of Technology | Optical information storage via amplitude modulation |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2222665A1 (fr) * | 1973-03-21 | 1974-10-18 | Thomson Brandt | |
FR2306495A1 (fr) * | 1975-04-04 | 1976-10-29 | Thomson Brandt | Systeme de lecture d'un enregistrement par exploration optique ponctuelle d'une piste diffractante |
US3992575A (en) * | 1974-02-25 | 1976-11-16 | U.S. Philips Corporation | Apparatus for optically reading a record carrier by means of an autofocus device |
FR2313732A1 (fr) * | 1975-06-02 | 1976-12-31 | Philips Nv | Dispositif pour la lecture d'un porteur d'enregistrement |
BE865140A (fr) * | 1977-03-23 | 1978-09-21 | Philips Nv | Dispositif pour la lecture d'un porteur d'enregistrement reflechissant le rayonnement optique |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2235448B1 (fr) * | 1973-06-29 | 1976-05-07 | Thomson Brandt | |
FR2313716A1 (fr) * | 1975-06-03 | 1976-12-31 | Thomson Brandt | Systeme optique de lecture par reflexion d'un support d'information |
JPS5332272A (en) * | 1976-09-07 | 1978-03-27 | Komatsu Forklift Kk | Interlock device between oil pressure system brake and mechanical system brake |
NL7703123A (nl) * | 1977-03-23 | 1978-09-26 | Philips Nv | Inrichting voor het uitlezen van een optische stralingsreflekterende registratiedrager. |
-
1978
- 1978-09-22 NL NL7809635A patent/NL7809635A/nl not_active Application Discontinuation
- 1978-12-11 US US05/968,644 patent/US4253019A/en not_active Expired - Lifetime
-
1979
- 1979-08-28 ZA ZA00794547A patent/ZA794547B/xx unknown
- 1979-09-06 AR AR277977A patent/AR223848A1/es active
- 1979-09-13 CA CA335,578A patent/CA1123640A/fr not_active Expired
- 1979-09-15 DE DE19792937427 patent/DE2937427A1/de active Granted
- 1979-09-18 AU AU50936/79A patent/AU530291B2/en not_active Ceased
- 1979-09-19 IT IT68838/79A patent/IT1165709B/it active
- 1979-09-19 BR BR7905978A patent/BR7905978A/pt unknown
- 1979-09-19 SE SE7907748A patent/SE437579B/sv not_active IP Right Cessation
- 1979-09-19 JP JP11947079A patent/JPS5545200A/ja active Granted
- 1979-09-19 GB GB7932504A patent/GB2033187B/en not_active Expired
- 1979-09-19 DK DK391279A patent/DK391279A/da unknown
- 1979-09-20 BE BE0/197241A patent/BE878905A/fr not_active IP Right Cessation
- 1979-09-20 ES ES484316A patent/ES484316A1/es not_active Expired
- 1979-09-20 DD DD79215678A patent/DD146118A5/de unknown
- 1979-09-21 FR FR7923575A patent/FR2437043B1/fr not_active Expired
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2222665A1 (fr) * | 1973-03-21 | 1974-10-18 | Thomson Brandt | |
US3992575A (en) * | 1974-02-25 | 1976-11-16 | U.S. Philips Corporation | Apparatus for optically reading a record carrier by means of an autofocus device |
FR2306495A1 (fr) * | 1975-04-04 | 1976-10-29 | Thomson Brandt | Systeme de lecture d'un enregistrement par exploration optique ponctuelle d'une piste diffractante |
FR2313732A1 (fr) * | 1975-06-02 | 1976-12-31 | Philips Nv | Dispositif pour la lecture d'un porteur d'enregistrement |
BE865140A (fr) * | 1977-03-23 | 1978-09-21 | Philips Nv | Dispositif pour la lecture d'un porteur d'enregistrement reflechissant le rayonnement optique |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0039836A2 (fr) * | 1980-05-12 | 1981-11-18 | Northern Telecom Limited | Tête de lecture pour un système à disque optique |
EP0039836A3 (en) * | 1980-05-12 | 1982-05-19 | Northern Telecom Limited | A scanning head for an optical disc system |
FR2538580A1 (fr) * | 1982-12-25 | 1984-06-29 | Pioneer Electronic Corp | Dispositif de lecture optique |
Also Published As
Publication number | Publication date |
---|---|
DD146118A5 (de) | 1981-01-21 |
CA1123640A (fr) | 1982-05-18 |
JPS624776B2 (fr) | 1987-01-31 |
AU5093679A (en) | 1980-03-27 |
IT1165709B (it) | 1987-04-22 |
DE2937427A1 (de) | 1980-04-10 |
DE2937427C2 (fr) | 1989-07-06 |
DK391279A (da) | 1980-03-23 |
IT7968838A0 (it) | 1979-09-19 |
NL7809635A (nl) | 1980-03-25 |
SE437579B (sv) | 1985-03-04 |
GB2033187A (en) | 1980-05-14 |
BR7905978A (pt) | 1980-07-08 |
AR223848A1 (es) | 1981-09-30 |
GB2033187B (en) | 1983-01-19 |
ZA794547B (en) | 1981-04-29 |
BE878905A (fr) | 1980-03-20 |
SE7907748L (sv) | 1980-03-23 |
AU530291B2 (en) | 1983-07-07 |
FR2437043B1 (fr) | 1985-07-12 |
JPS5545200A (en) | 1980-03-29 |
ES484316A1 (es) | 1980-05-16 |
US4253019A (en) | 1981-02-24 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |