IT1024778B - OPTICAL READER DEVICE FOR DISC-SHAPED RECORDING MEDIA - Google Patents
OPTICAL READER DEVICE FOR DISC-SHAPED RECORDING MEDIAInfo
- Publication number
- IT1024778B IT1024778B IT70277/74A IT7027774A IT1024778B IT 1024778 B IT1024778 B IT 1024778B IT 70277/74 A IT70277/74 A IT 70277/74A IT 7027774 A IT7027774 A IT 7027774A IT 1024778 B IT1024778 B IT 1024778B
- Authority
- IT
- Italy
- Prior art keywords
- disc
- recording media
- reader device
- shaped recording
- optical reader
- Prior art date
Links
- 230000003287 optical effect Effects 0.000 title 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
- G11B7/08—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
- G11B7/0948—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 specially adapted for detection and avoidance or compensation of imperfections on the carrier, e.g. dust, scratches, dropouts
-
- 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
- G11B7/0901—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 track following only
- G11B7/0903—Multi-beam tracking systems
-
- 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
- G11B7/0946—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 specially adapted for operation during external perturbations not related to the carrier or servo beam, e.g. vibration
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7315419A NL7315419A (en) | 1973-11-10 | 1973-11-10 | DEVICE FOR READING A DISK-SHAPED REGISTRATION CARRIER. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| IT1024778B true IT1024778B (en) | 1978-07-20 |
Family
ID=19819976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IT70277/74A IT1024778B (en) | 1973-11-10 | 1974-11-07 | OPTICAL READER DEVICE FOR DISC-SHAPED RECORDING MEDIA |
Country Status (17)
| Country | Link |
|---|---|
| JP (1) | JPS5433724B2 (en) |
| AR (1) | AR204426A1 (en) |
| AT (1) | AT336298B (en) |
| BE (1) | BE822040A (en) |
| BR (1) | BR7409349A (en) |
| CA (1) | CA1055156A (en) |
| CH (1) | CH579807A5 (en) |
| DE (1) | DE2452815C2 (en) |
| DK (1) | DK135070B (en) |
| ES (1) | ES431776A1 (en) |
| FR (1) | FR2251067B1 (en) |
| GB (1) | GB1490726A (en) |
| IT (1) | IT1024778B (en) |
| NL (1) | NL7315419A (en) |
| NO (1) | NO144501C (en) |
| SE (1) | SE394335B (en) |
| ZA (1) | ZA746767B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2396379A1 (en) * | 1977-07-01 | 1979-01-26 | Thomson Brandt | OPTICAL INFORMATION DISC READER EQUIPPED WITH AN AUTOMATIC INFORMATION ACCESS DEVICE |
| NL7803517A (en) * | 1978-04-03 | 1979-10-05 | Philips Nv | RECORD CARRIER WITH AN OPTICALLY READABLE PHASE STRUCTURE AND DEVICE FOR READING. |
| JPS626580Y2 (en) * | 1979-11-17 | 1987-02-16 | ||
| NL8001974A (en) * | 1980-04-03 | 1981-11-02 | Philips Nv | TRACKING DEVICE. |
| JPS57113428A (en) * | 1980-12-29 | 1982-07-14 | Pioneer Video Corp | Focus servo device |
| NL8105347A (en) * | 1981-11-26 | 1983-06-16 | Philips Nv | Apparatus for the optical scanning of a disc-shaped record carrier. |
| NL8105346A (en) * | 1981-11-26 | 1983-06-16 | ||
| NL8200208A (en) * | 1982-01-21 | 1983-08-16 | Philips Nv | DEVICE FOR READING A DISC REGISTRATION CARRIER. |
| JPS58143472A (en) * | 1982-02-22 | 1983-08-26 | Hitachi Ltd | Tracking servo controller of recording information reproducing device |
| JPS58169350A (en) * | 1982-03-31 | 1983-10-05 | Hitachi Ltd | Optical track shift detecting system |
| GB8824888D0 (en) * | 1988-10-24 | 2002-08-14 | British Aerospace | Servo actuation systems |
-
1973
- 1973-11-10 NL NL7315419A patent/NL7315419A/en not_active Application Discontinuation
-
1974
- 1974-01-01 AR AR256416A patent/AR204426A1/en active
- 1974-10-24 ZA ZA00746767A patent/ZA746767B/en unknown
- 1974-11-04 CA CA212,960A patent/CA1055156A/en not_active Expired
- 1974-11-07 SE SE7413962A patent/SE394335B/en not_active IP Right Cessation
- 1974-11-07 DK DK580974AA patent/DK135070B/en not_active IP Right Cessation
- 1974-11-07 IT IT70277/74A patent/IT1024778B/en active
- 1974-11-07 NO NO744015A patent/NO144501C/en unknown
- 1974-11-07 GB GB48309/74A patent/GB1490726A/en not_active Expired
- 1974-11-07 JP JP12763274A patent/JPS5433724B2/ja not_active Expired
- 1974-11-07 CH CH1490774A patent/CH579807A5/xx not_active IP Right Cessation
- 1974-11-07 BR BR9349/74A patent/BR7409349A/en unknown
- 1974-11-07 DE DE2452815A patent/DE2452815C2/en not_active Expired
- 1974-11-08 BE BE150377A patent/BE822040A/en not_active IP Right Cessation
- 1974-11-08 ES ES431776A patent/ES431776A1/en not_active Expired
- 1974-11-08 AT AT895674A patent/AT336298B/en not_active IP Right Cessation
- 1974-11-08 FR FR7437019A patent/FR2251067B1/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL7315419A (en) | 1975-05-13 |
| CA1055156A (en) | 1979-05-22 |
| NO144501B (en) | 1981-06-01 |
| GB1490726A (en) | 1977-11-02 |
| SE394335B (en) | 1977-06-20 |
| ZA746767B (en) | 1976-05-26 |
| AR204426A1 (en) | 1976-02-06 |
| DE2452815C2 (en) | 1982-10-28 |
| DE2452815A1 (en) | 1975-06-26 |
| FR2251067B1 (en) | 1983-08-05 |
| CH579807A5 (en) | 1976-09-15 |
| NO744015L (en) | 1975-06-09 |
| SE7413962L (en) | 1975-05-12 |
| AT336298B (en) | 1977-04-25 |
| BR7409349A (en) | 1976-05-18 |
| BE822040A (en) | 1975-05-09 |
| JPS5433724B2 (en) | 1979-10-23 |
| FR2251067A1 (en) | 1975-06-06 |
| DK135070B (en) | 1977-02-28 |
| NO144501C (en) | 1981-09-09 |
| ATA895674A (en) | 1976-08-15 |
| DK580974A (en) | 1975-07-07 |
| JPS5081218A (en) | 1975-07-01 |
| DK135070C (en) | 1977-08-01 |
| AU7515574A (en) | 1976-05-13 |
| ES431776A1 (en) | 1976-12-16 |
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