FR2422219B1 - - Google Patents
Info
- Publication number
- FR2422219B1 FR2422219B1 FR7908808A FR7908808A FR2422219B1 FR 2422219 B1 FR2422219 B1 FR 2422219B1 FR 7908808 A FR7908808 A FR 7908808A FR 7908808 A FR7908808 A FR 7908808A FR 2422219 B1 FR2422219 B1 FR 2422219B1
- Authority
- FR
- France
- 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.)
- Expired
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
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4033478A JPS54133305A (en) | 1978-04-07 | 1978-04-07 | Information recorder |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2422219A1 FR2422219A1 (fr) | 1979-11-02 |
FR2422219B1 true FR2422219B1 (fr) | 1983-08-19 |
Family
ID=12577716
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7908808A Granted FR2422219A1 (fr) | 1978-04-07 | 1979-04-06 | Appareil d'enregistrement d'informations |
Country Status (7)
Country | Link |
---|---|
US (1) | US4556965A (fr) |
JP (1) | JPS54133305A (fr) |
CA (1) | CA1139440A (fr) |
DE (1) | DE2913778A1 (fr) |
FR (1) | FR2422219A1 (fr) |
GB (1) | GB2019044B (fr) |
NL (1) | NL7902676A (fr) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2504281A1 (fr) * | 1981-04-16 | 1982-10-22 | Euromask | Appareil de projection a dispositif de mise au point |
JPS57200912A (en) * | 1981-06-04 | 1982-12-09 | Pioneer Electronic Corp | Information recording system |
US4574371A (en) * | 1982-02-20 | 1986-03-04 | Olympus Optical Company Limited | Apparatus for recording and reproducing information on an optical disc |
US4499569A (en) * | 1982-09-07 | 1985-02-12 | Discovision Associates | Writing beam focus monitor |
US4670869A (en) * | 1984-01-03 | 1987-06-02 | Magnetic Peripherals Inc. | Switching laser beam apparatus with recombined beam for recording |
JPS60171638A (ja) * | 1984-02-16 | 1985-09-05 | Matsushita Electric Ind Co Ltd | 情報再生装置 |
US4998234A (en) * | 1987-03-31 | 1991-03-05 | Rees Theodore D | Logarithmic servo error detection for optical disk drive |
Family Cites Families (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1593883A (fr) * | 1968-02-17 | 1970-06-01 | ||
CH477675A (de) * | 1968-02-17 | 1969-08-31 | Leitz Ernst Gmbh | Gerät zum mikroskopischen Bestimmen oder Einstellen der Lage der Kante eines Objektes |
US3665483A (en) * | 1969-06-06 | 1972-05-23 | Chase Manhattan Capital Corp | Laser recording medium |
FR2222666B1 (fr) * | 1973-03-19 | 1976-11-05 | Thomson Brandt | |
US3866238A (en) * | 1973-06-01 | 1975-02-11 | North Electric Co | Laser diode for use with film memory system |
JPS5016423A (fr) * | 1973-06-11 | 1975-02-21 | ||
JPS5442266B2 (fr) * | 1973-07-27 | 1979-12-13 | ||
NL7313454A (nl) * | 1973-10-01 | 1975-04-03 | Philips Nv | Opto-elektronisch stelsel voor het bepalen van een king tussen de werkelijke positie van een stralings kterend vlak in een optisch afbeeldingsstelsel en d ste positie van dit vlak. |
NL7414695A (nl) * | 1973-11-09 | 1975-05-13 | Hitachi Ltd | Automatische focusseringsinrichting. |
NL7410642A (nl) * | 1974-08-08 | 1976-02-10 | Philips Nv | Opto-elektronisch fokusseringsdetektiestelsel. |
US4069487A (en) * | 1974-12-26 | 1978-01-17 | Canon Kabushiki Kaisha | Recording member and process for recording |
FR2304981A1 (fr) * | 1975-03-21 | 1976-10-15 | Thomson Brandt | Dispositif d'enregistrement optique d'informations |
NL7504783A (nl) * | 1975-04-23 | 1976-10-26 | Philips Nv | Stralingsgevoelig materiaal. |
DE2630381C2 (de) * | 1975-07-07 | 1983-05-26 | Pioneer Electronic Corp., Tokyo | Optischer Leser |
FR2325987A1 (fr) * | 1975-09-29 | 1977-04-22 | Thomson Brandt | Dispositif de lecture optique d'un enregistrement |
US4065786A (en) * | 1975-09-30 | 1977-12-27 | Rca Corporation | Videodisc playback system |
US4110607A (en) * | 1975-12-22 | 1978-08-29 | Victor Company Of Japan, Ltd. | System for detecting height fluctuations of a surface on a recording medium in an optical recording or reproducing apparatus |
NL7600843A (nl) * | 1976-01-28 | 1977-08-01 | Philips Nv | Inrichting voor het uitlezen van een registratie- drager waarop informatie, bijvoorbeeld en/of ge- luidsinformatie, is aangebracht. |
JPS52120805A (en) * | 1976-04-02 | 1977-10-11 | Sony Corp | Servo apparatus |
GB1532345A (en) * | 1976-06-25 | 1978-11-15 | Hitachi Ltd | Information play-back apparatus |
NL7708200A (nl) * | 1976-07-28 | 1978-01-31 | Hitachi Ltd | Automatische scherpstellingsinrichting. |
NL7608561A (nl) * | 1976-08-02 | 1978-02-06 | Philips Nv | Optische uitleeseenheid voor het aftasten van een registratiedrager voorzien van een stra- lingsreflekterende informatiestruktuur. |
JPS606014B2 (ja) * | 1976-10-07 | 1985-02-15 | ソニー株式会社 | 情報検出装置 |
DE2724876A1 (de) * | 1977-06-02 | 1978-12-14 | Bosch Gmbh Robert | System zur automatischen, beruehrungslosen abstandsregelung bei optischer signalaufzeichnung bzw. -wiedergabe |
JPS54102107A (en) * | 1978-01-30 | 1979-08-11 | Hitachi Ltd | Control information detecting method |
NL187413C (nl) * | 1978-03-16 | 1991-09-16 | Philips Nv | Registratiedragerlichaam, ingeschreven registratiedrager, werkwijze voor het inschrijven van het registratiedragerlichaam en inrichting voor het uitvoeren van de werkwijze en voor het uitlezen van een ingeschreven registratiedrager. |
JPS54143109A (en) * | 1978-04-28 | 1979-11-08 | Hitachi Ltd | Optical information device |
-
1978
- 1978-04-07 JP JP4033478A patent/JPS54133305A/ja active Granted
-
1979
- 1979-04-05 NL NL7902676A patent/NL7902676A/xx not_active Application Discontinuation
- 1979-04-05 DE DE19792913778 patent/DE2913778A1/de not_active Ceased
- 1979-04-06 CA CA000325085A patent/CA1139440A/fr not_active Expired
- 1979-04-06 FR FR7908808A patent/FR2422219A1/fr active Granted
- 1979-05-23 GB GB7910344A patent/GB2019044B/en not_active Expired
-
1981
- 1981-03-09 US US06/241,728 patent/US4556965A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
GB2019044B (en) | 1982-09-08 |
US4556965A (en) | 1985-12-03 |
CA1139440A (fr) | 1983-01-11 |
JPS54133305A (en) | 1979-10-17 |
NL7902676A (nl) | 1979-10-09 |
FR2422219A1 (fr) | 1979-11-02 |
GB2019044A (en) | 1979-10-24 |
JPH0115931B2 (fr) | 1989-03-22 |
DE2913778A1 (de) | 1979-10-18 |