CA1109560A - Apparatus for reading a radiation-reflecting record carrier - Google Patents
Apparatus for reading a radiation-reflecting record carrierInfo
- Publication number
- CA1109560A CA1109560A CA298,999A CA298999A CA1109560A CA 1109560 A CA1109560 A CA 1109560A CA 298999 A CA298999 A CA 298999A CA 1109560 A CA1109560 A CA 1109560A
- Authority
- CA
- Canada
- Prior art keywords
- radiation
- focussing
- record carrier
- astigmatic
- 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
Landscapes
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
- Automatic Focus Adjustment (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7703076 | 1977-03-22 | ||
| NL7703076A NL7703076A (nl) | 1977-03-22 | 1977-03-22 | Inrichting voor het uitlezen van een stralings- reflekterende registratiedrager. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1109560A true CA1109560A (en) | 1981-09-22 |
Family
ID=19828205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA298,999A Expired CA1109560A (en) | 1977-03-22 | 1978-03-15 | Apparatus for reading a radiation-reflecting record carrier |
Country Status (20)
| Country | Link |
|---|---|
| JP (1) | JPS53117403A (it) |
| AR (1) | AR214353A1 (it) |
| AT (1) | AT369580B (it) |
| AU (1) | AU510218B2 (it) |
| BE (1) | BE865083A (it) |
| BR (1) | BR7801690A (it) |
| CA (1) | CA1109560A (it) |
| CH (1) | CH627016A5 (it) |
| DE (1) | DE2810616A1 (it) |
| DK (1) | DK145868C (it) |
| ES (1) | ES468055A1 (it) |
| FR (1) | FR2385171A1 (it) |
| IT (1) | IT1093316B (it) |
| MX (1) | MX143603A (it) |
| NL (1) | NL7703076A (it) |
| NZ (1) | NZ186732A (it) |
| PL (1) | PL113996B1 (it) |
| SE (1) | SE424676B (it) |
| YU (1) | YU39193B (it) |
| ZA (1) | ZA78216B (it) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1131361A (en) * | 1977-05-11 | 1982-09-07 | Fumitaka Kotaka | Focus servo device for use in optical read-out device of information |
| FR2460022B1 (fr) * | 1979-06-25 | 1987-09-11 | Hitachi Ltd | Systeme optique de reproduction d'informations |
| NL7907216A (nl) * | 1979-09-28 | 1981-03-31 | Philips Nv | Optisch fokusfout-detektiestelsel. |
| JPS59125727U (ja) * | 1983-02-15 | 1984-08-24 | パイオニア株式会社 | 光学式情報ピツクアツプ装置 |
| NL8400674A (nl) * | 1984-03-02 | 1985-10-01 | Philips Nv | Inrichting voor het inschrijven en/of uitlezen van informatie in een spoor van een reflekterende registratiedrager, met een fokusregeling met verminderde spot offsetgevoeligheid. |
| JPS6139942A (ja) * | 1984-08-01 | 1986-02-26 | Matsushita Electric Ind Co Ltd | 光ピツクアツプ |
| US4609813A (en) * | 1985-03-18 | 1986-09-02 | International Business Machines Corporation | Optical systems employing ovate light beams |
| JPS6310326A (ja) * | 1986-07-01 | 1988-01-16 | Sanyo Electric Co Ltd | 光ピツクアツプ装置 |
| DE3828146A1 (de) * | 1988-08-19 | 1990-02-22 | Philips Patentverwaltung | Elektrodynamischer aktuator fuer eine optische einschreib- und ausleseeinheit |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2271590B1 (it) * | 1974-01-15 | 1978-12-01 | Thomson Brandt | |
| NL182990C (nl) * | 1975-07-07 | 1988-06-16 | Philips Nv | Inrichting voor het uitlezen van een stralingsreflekterende registratiedrager. |
| FR2325987A1 (fr) * | 1975-09-29 | 1977-04-22 | Thomson Brandt | Dispositif de lecture optique d'un enregistrement |
| 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 (nl) * | 1977-03-22 | 1978-09-26 | Philips Nv | Inrichting voor het uitlezen van een stralings- reflekterende registratiedrager. |
-
1977
- 1977-03-22 NL NL7703076A patent/NL7703076A/xx not_active Application Discontinuation
-
1978
- 1978-01-12 ZA ZA00780216A patent/ZA78216B/xx unknown
- 1978-02-06 AR AR270983A patent/AR214353A1/es active
- 1978-03-11 DE DE19782810616 patent/DE2810616A1/de active Pending
- 1978-03-15 CA CA298,999A patent/CA1109560A/en not_active Expired
- 1978-03-17 DK DK120578A patent/DK145868C/da not_active IP Right Cessation
- 1978-03-17 IT IT21340/78A patent/IT1093316B/it active
- 1978-03-17 MX MX172816A patent/MX143603A/es unknown
- 1978-03-20 SE SE7803138A patent/SE424676B/sv not_active IP Right Cessation
- 1978-03-20 PL PL1978205453A patent/PL113996B1/pl unknown
- 1978-03-20 BR BR7801690A patent/BR7801690A/pt unknown
- 1978-03-20 CH CH302678A patent/CH627016A5/de not_active IP Right Cessation
- 1978-03-20 AT AT0196578A patent/AT369580B/de not_active IP Right Cessation
- 1978-03-20 NZ NZ186732A patent/NZ186732A/xx unknown
- 1978-03-20 BE BE186087A patent/BE865083A/xx not_active IP Right Cessation
- 1978-03-20 AU AU34294/78A patent/AU510218B2/en not_active Expired
- 1978-03-20 ES ES468055A patent/ES468055A1/es not_active Expired
- 1978-03-21 YU YU00673/78A patent/YU39193B/xx unknown
- 1978-03-22 JP JP3182778A patent/JPS53117403A/ja active Pending
- 1978-03-22 FR FR7808294A patent/FR2385171A1/fr active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| NZ186732A (en) | 1981-02-11 |
| YU39193B (en) | 1984-08-31 |
| CH627016A5 (en) | 1981-12-15 |
| ES468055A1 (es) | 1978-11-16 |
| FR2385171A1 (fr) | 1978-10-20 |
| IT1093316B (it) | 1985-07-19 |
| AU510218B2 (en) | 1980-06-12 |
| ZA78216B (en) | 1979-08-29 |
| AT369580B (de) | 1983-01-10 |
| DK145868B (da) | 1983-03-21 |
| PL205453A1 (pl) | 1978-12-18 |
| AU3429478A (en) | 1979-09-27 |
| DK120578A (da) | 1978-09-23 |
| SE7803138L (sv) | 1978-09-23 |
| IT7821340A0 (it) | 1978-03-17 |
| ATA196578A (de) | 1982-05-15 |
| DK145868C (da) | 1983-09-12 |
| AR214353A1 (es) | 1979-05-31 |
| MX143603A (es) | 1981-06-05 |
| NL7703076A (nl) | 1978-09-26 |
| YU67378A (en) | 1982-06-30 |
| BR7801690A (pt) | 1979-01-02 |
| PL113996B1 (en) | 1981-01-31 |
| JPS53117403A (en) | 1978-10-13 |
| DE2810616A1 (de) | 1978-09-28 |
| BE865083A (fr) | 1978-09-20 |
| SE424676B (sv) | 1982-08-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |