NZ186732A - Focussing of read beam on optically readable record by astigmatic lens - Google Patents
Focussing of read beam on optically readable record by astigmatic lensInfo
- Publication number
- NZ186732A NZ186732A NZ186732A NZ18673278A NZ186732A NZ 186732 A NZ186732 A NZ 186732A NZ 186732 A NZ186732 A NZ 186732A NZ 18673278 A NZ18673278 A NZ 18673278A NZ 186732 A NZ186732 A NZ 186732A
- Authority
- NZ
- New Zealand
- Prior art keywords
- focussing
- optically readable
- read beam
- readable record
- astigmatic lens
- Prior art date
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 |
|---|---|---|---|
| NL7703076A NL7703076A (en) | 1977-03-22 | 1977-03-22 | DEVICE FOR READING A RADIATION-REFLECTING RECORD CARRIER. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NZ186732A true NZ186732A (en) | 1981-02-11 |
Family
ID=19828205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NZ186732A NZ186732A (en) | 1977-03-22 | 1978-03-20 | Focussing of read beam on optically readable record by astigmatic lens |
Country Status (20)
| Country | Link |
|---|---|
| JP (1) | JPS53117403A (en) |
| AR (1) | AR214353A1 (en) |
| AT (1) | AT369580B (en) |
| AU (1) | AU510218B2 (en) |
| BE (1) | BE865083A (en) |
| BR (1) | BR7801690A (en) |
| CA (1) | CA1109560A (en) |
| CH (1) | CH627016A5 (en) |
| DE (1) | DE2810616A1 (en) |
| DK (1) | DK145868C (en) |
| ES (1) | ES468055A1 (en) |
| FR (1) | FR2385171A1 (en) |
| IT (1) | IT1093316B (en) |
| MX (1) | MX143603A (en) |
| NL (1) | NL7703076A (en) |
| NZ (1) | NZ186732A (en) |
| PL (1) | PL113996B1 (en) |
| SE (1) | SE424676B (en) |
| YU (1) | YU39193B (en) |
| ZA (1) | ZA78216B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4290132A (en) * | 1977-05-11 | 1981-09-15 | Pioneer Electronic Corporation | Focus servo device for use in an optical information read-out device |
| FR2460022B1 (en) * | 1979-06-25 | 1987-09-11 | Hitachi Ltd | OPTICAL INFORMATION REPRODUCING SYSTEM |
| NL7907216A (en) * | 1979-09-28 | 1981-03-31 | Philips Nv | OPTICAL FOCUS ERROR DETECTION SYSTEM. |
| JPS59125727U (en) * | 1983-02-15 | 1984-08-24 | パイオニア株式会社 | Optical information pickup device |
| NL8400674A (en) * | 1984-03-02 | 1985-10-01 | Philips Nv | DEVICE FOR REGISTERING AND / OR READING INFORMATION IN A TRACK OF A REFLECTIVE RECORD CARRIER WITH A FOCUS CONTROL WITH REDUCED SPOT OFFSET SENSITIVITY. |
| JPS6139942A (en) * | 1984-08-01 | 1986-02-26 | Matsushita Electric Ind Co Ltd | Optical pickup |
| US4609813A (en) * | 1985-03-18 | 1986-09-02 | International Business Machines Corporation | Optical systems employing ovate light beams |
| JPS6310326A (en) * | 1986-07-01 | 1988-01-16 | Sanyo Electric Co Ltd | Optical pickup device |
| DE3828146A1 (en) * | 1988-08-19 | 1990-02-22 | Philips Patentverwaltung | ELECTRODYNAMIC ACTUATOR FOR AN OPTICAL WRITE-IN AND READ-OUT UNIT |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2271590B1 (en) * | 1974-01-15 | 1978-12-01 | Thomson Brandt | |
| NL182990C (en) * | 1975-07-07 | 1988-06-16 | Philips Nv | DEVICE FOR READING A RADIATION-REFLECTING RECORD CARRIER. |
| FR2325987A1 (en) * | 1975-09-29 | 1977-04-22 | Thomson Brandt | OPTICAL READING DEVICE FOR A RECORDING |
| GB1532345A (en) * | 1976-06-25 | 1978-11-15 | Hitachi Ltd | Information play-back apparatus |
| JPS5337722A (en) * | 1976-09-20 | 1978-04-07 | Ebata Shiyouji Kk | Method of producing concrete piles |
| NL7703077A (en) * | 1977-03-22 | 1978-09-26 | Philips Nv | DEVICE FOR READING A RADIATION-REFLECTING RECORD CARRIER. |
-
1977
- 1977-03-22 NL NL7703076A patent/NL7703076A/en not_active Application Discontinuation
-
1978
- 1978-01-12 ZA ZA00780216A patent/ZA78216B/en unknown
- 1978-02-06 AR AR270983A patent/AR214353A1/en active
- 1978-03-11 DE DE19782810616 patent/DE2810616A1/en active Pending
- 1978-03-15 CA CA298,999A patent/CA1109560A/en not_active Expired
- 1978-03-17 MX MX172816A patent/MX143603A/en unknown
- 1978-03-17 DK DK120578A patent/DK145868C/en not_active IP Right Cessation
- 1978-03-17 IT IT21340/78A patent/IT1093316B/en active
- 1978-03-20 BE BE186087A patent/BE865083A/en not_active IP Right Cessation
- 1978-03-20 SE SE7803138A patent/SE424676B/en not_active IP Right Cessation
- 1978-03-20 ES ES468055A patent/ES468055A1/en not_active Expired
- 1978-03-20 AT AT0196578A patent/AT369580B/en not_active IP Right Cessation
- 1978-03-20 BR BR7801690A patent/BR7801690A/en unknown
- 1978-03-20 NZ NZ186732A patent/NZ186732A/en unknown
- 1978-03-20 CH CH302678A patent/CH627016A5/en not_active IP Right Cessation
- 1978-03-20 PL PL1978205453A patent/PL113996B1/en unknown
- 1978-03-20 AU AU34294/78A patent/AU510218B2/en not_active Expired
- 1978-03-21 YU YU00673/78A patent/YU39193B/en unknown
- 1978-03-22 JP JP3182778A patent/JPS53117403A/en active Pending
- 1978-03-22 FR FR7808294A patent/FR2385171A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| YU39193B (en) | 1984-08-31 |
| PL205453A1 (en) | 1978-12-18 |
| ATA196578A (en) | 1982-05-15 |
| DK120578A (en) | 1978-09-23 |
| CA1109560A (en) | 1981-09-22 |
| AU510218B2 (en) | 1980-06-12 |
| MX143603A (en) | 1981-06-05 |
| SE424676B (en) | 1982-08-02 |
| CH627016A5 (en) | 1981-12-15 |
| BE865083A (en) | 1978-09-20 |
| AR214353A1 (en) | 1979-05-31 |
| FR2385171A1 (en) | 1978-10-20 |
| BR7801690A (en) | 1979-01-02 |
| ES468055A1 (en) | 1978-11-16 |
| IT1093316B (en) | 1985-07-19 |
| SE7803138L (en) | 1978-09-23 |
| AT369580B (en) | 1983-01-10 |
| YU67378A (en) | 1982-06-30 |
| PL113996B1 (en) | 1981-01-31 |
| DE2810616A1 (en) | 1978-09-28 |
| NL7703076A (en) | 1978-09-26 |
| JPS53117403A (en) | 1978-10-13 |
| IT7821340A0 (en) | 1978-03-17 |
| DK145868C (en) | 1983-09-12 |
| ZA78216B (en) | 1979-08-29 |
| AU3429478A (en) | 1979-09-27 |
| DK145868B (en) | 1983-03-21 |
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