ES468055A1 - Reflection type record carrier reader - Google Patents
Reflection type record carrier readerInfo
- Publication number
- ES468055A1 ES468055A1 ES468055A ES468055A ES468055A1 ES 468055 A1 ES468055 A1 ES 468055A1 ES 468055 A ES468055 A ES 468055A ES 468055 A ES468055 A ES 468055A ES 468055 A1 ES468055 A1 ES 468055A1
- Authority
- ES
- Spain
- Prior art keywords
- whose
- radiation
- astigmatic
- reading
- detectors
- 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.)
- 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
Abstract
Improved apparatus for reading a reflective registration carrier to the radiation, on which information is stored in an information structure arranged as an optically readable track, which apparatus comprises a radiation source that produces a read beam, an objective system for passing the reading beam to a detection system sensitive to radiation through the record carrier, whose system converts the reading beam, which has been modulated by the information structure, into an electrical signal, and an optical system; electronic detection of focusing error, to determine a deviation between the desired position and the actual focus plane of the target system, whose focusing error detection system comprises an astigmatic element, and a radiation sensitive detector, whose detector comprises four sub-detectors that are arranged in four different quadrants of an xy coordinate system ima ginary, the axis of the x and the axis of the y being arranged at an angle of 45º with the astigmatic focal lines of the astigmatic element, characterized in that one of the axes of the coordinate system in whose quadrants the sub-detectors are arranged is parallel to the effective track direction and because the astigmatic focal lines are arranged at an angle of 45º with the effective track direction. (Machine-translation by Google Translate, not legally binding)
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 |
|---|---|
| ES468055A1 true ES468055A1 (en) | 1978-11-16 |
Family
ID=19828205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES468055A Expired ES468055A1 (en) | 1977-03-22 | 1978-03-20 | Reflection type record carrier reader |
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 IT IT21340/78A patent/IT1093316B/en active
- 1978-03-17 MX MX172816A patent/MX143603A/en unknown
- 1978-03-17 DK DK120578A patent/DK145868C/en not_active IP Right Cessation
- 1978-03-20 CH CH302678A patent/CH627016A5/en not_active IP Right Cessation
- 1978-03-20 NZ NZ186732A patent/NZ186732A/en unknown
- 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 PL PL1978205453A patent/PL113996B1/en unknown
- 1978-03-20 BR BR7801690A patent/BR7801690A/en unknown
- 1978-03-20 BE BE186087A patent/BE865083A/en not_active IP Right Cessation
- 1978-03-20 AU AU34294/78A patent/AU510218B2/en not_active Expired
- 1978-03-20 SE SE7803138A patent/SE424676B/en not_active IP Right Cessation
- 1978-03-21 YU YU00673/78A patent/YU39193B/en unknown
- 1978-03-22 FR FR7808294A patent/FR2385171A1/en active Pending
- 1978-03-22 JP JP3182778A patent/JPS53117403A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| SE424676B (en) | 1982-08-02 |
| DK145868B (en) | 1983-03-21 |
| AU3429478A (en) | 1979-09-27 |
| DK120578A (en) | 1978-09-23 |
| IT1093316B (en) | 1985-07-19 |
| FR2385171A1 (en) | 1978-10-20 |
| IT7821340A0 (en) | 1978-03-17 |
| NL7703076A (en) | 1978-09-26 |
| JPS53117403A (en) | 1978-10-13 |
| AU510218B2 (en) | 1980-06-12 |
| BR7801690A (en) | 1979-01-02 |
| CA1109560A (en) | 1981-09-22 |
| ZA78216B (en) | 1979-08-29 |
| AR214353A1 (en) | 1979-05-31 |
| YU67378A (en) | 1982-06-30 |
| PL113996B1 (en) | 1981-01-31 |
| MX143603A (en) | 1981-06-05 |
| CH627016A5 (en) | 1981-12-15 |
| NZ186732A (en) | 1981-02-11 |
| PL205453A1 (en) | 1978-12-18 |
| DE2810616A1 (en) | 1978-09-28 |
| SE7803138L (en) | 1978-09-23 |
| BE865083A (en) | 1978-09-20 |
| AT369580B (en) | 1983-01-10 |
| DK145868C (en) | 1983-09-12 |
| YU39193B (en) | 1984-08-31 |
| ATA196578A (en) | 1982-05-15 |
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