CH620541A5 - - Google Patents
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- Publication number
- CH620541A5 CH620541A5 CH89277A CH89277A CH620541A5 CH 620541 A5 CH620541 A5 CH 620541A5 CH 89277 A CH89277 A CH 89277A CH 89277 A CH89277 A CH 89277A CH 620541 A5 CH620541 A5 CH 620541A5
- Authority
- CH
- Switzerland
- Prior art keywords
- detectors
- circuit
- signal
- information
- focusing
- 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
- G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10502—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing characterised by the transducing operation to be executed
- G11B11/10515—Reproducing
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/1055—Disposition or mounting of transducers relative to record carriers
- G11B11/10576—Disposition or mounting of transducers relative to record carriers with provision for moving the transducers for maintaining alignment or spacing relative to the carrier
-
- 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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/13—Optical detectors therefor
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
- Automatic Focus Adjustment (AREA)
- Automatic Tape Cassette Changers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7600843A NL7600843A (nl) | 1976-01-28 | 1976-01-28 | Inrichting voor het uitlezen van een registratie- drager waarop informatie, bijvoorbeeld en/of ge- luidsinformatie, is aangebracht. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH620541A5 true CH620541A5 (es) | 1980-11-28 |
Family
ID=19825527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH89277A CH620541A5 (es) | 1976-01-28 | 1977-01-25 |
Country Status (22)
| Country | Link |
|---|---|
| US (1) | US4051527A (es) |
| JP (1) | JPS5293223A (es) |
| AR (1) | AR217251A1 (es) |
| AT (1) | AT349230B (es) |
| AU (1) | AU505467B2 (es) |
| BE (1) | BE850782A (es) |
| BR (1) | BR7700453A (es) |
| CA (1) | CA1096494A (es) |
| CH (1) | CH620541A5 (es) |
| DE (1) | DE2701538C3 (es) |
| DK (1) | DK145866C (es) |
| ES (1) | ES455361A1 (es) |
| FR (1) | FR2339929A1 (es) |
| GB (1) | GB1572409A (es) |
| IT (1) | IT1084008B (es) |
| MX (1) | MX144032A (es) |
| NL (1) | NL7600843A (es) |
| NO (1) | NO149794C (es) |
| NZ (1) | NZ183153A (es) |
| PL (1) | PL108352B1 (es) |
| SE (1) | SE417555B (es) |
| ZA (1) | ZA7710B (es) |
Families Citing this family (38)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL7708200A (nl) * | 1976-07-28 | 1978-01-31 | Hitachi Ltd | Automatische scherpstellingsinrichting. |
| CA1091966A (en) * | 1976-10-15 | 1980-12-23 | Chiaki Kojima | Apparatus for reading signals recorded on a record carrier |
| JPS5398802A (en) * | 1977-02-09 | 1978-08-29 | Mitsubishi Electric Corp | Optical reproducer |
| JPS54124705A (en) * | 1978-03-20 | 1979-09-27 | Teac Corp | Optical reproducer |
| JPS54133305A (en) * | 1978-04-07 | 1979-10-17 | Hitachi Ltd | Information recorder |
| NL7805069A (nl) * | 1978-05-11 | 1979-11-13 | Philips Nv | Inrichting voor puntsgewijze aftasting van een infor- matievlak. |
| JPS5538639A (en) * | 1978-09-07 | 1980-03-18 | Pioneer Video Corp | Servo drawing-in unit for focus lens of optical information reader |
| NL7904724A (nl) * | 1979-06-18 | 1980-12-22 | Philips Nv | Optische aftastinrichting met fokusseerstelsel. |
| US4320486A (en) * | 1980-01-11 | 1982-03-16 | Advanced Integrated Design, Incorporated | Transferring information signals from a first to a second recording medium |
| US4358774A (en) * | 1980-07-14 | 1982-11-09 | Discovision Associates | Apparatus and method for controlling focus in a recording system |
| US4484319A (en) * | 1980-09-19 | 1984-11-20 | Matsushita Electric Industrial Co., Ltd. | Apparatus for locating a track on disc-like optical information carriers |
| JPS5766533A (en) * | 1980-10-09 | 1982-04-22 | Olympus Optical Co Ltd | Optical information reader |
| JPS5774837A (en) * | 1980-10-25 | 1982-05-11 | Olympus Optical Co Ltd | Signal detection system of optical information reproducing device |
| JPS57120238A (en) * | 1981-01-16 | 1982-07-27 | Matsushita Electric Ind Co Ltd | Reproducing device |
| JPS57195634U (es) * | 1981-06-05 | 1982-12-11 | ||
| US4414658A (en) * | 1981-06-12 | 1983-11-08 | Mcdonnell Douglas Corporation | Linear tracking arrangement in a photographic disc type information containing system |
| US4458144A (en) * | 1981-06-30 | 1984-07-03 | Storage Technology Corporation | Apparatus for reading information stored in a track pattern on a radiation reflecting record |
| JPS5854457A (ja) * | 1981-09-28 | 1983-03-31 | Hitachi Ltd | 異常時デ−タのフリ−ズ方式 |
| JPS58118039A (ja) * | 1982-01-06 | 1983-07-13 | Hitachi Ltd | 光デイスクトラツク追跡装置 |
| JPS58220252A (ja) * | 1982-06-16 | 1983-12-21 | Hitachi Ltd | 光学式ピツクアツプのトラツキング誤差信号検出回路 |
| US4559622A (en) * | 1982-09-09 | 1985-12-17 | Burroughs Corporation | Optical memory system providing improved focus detection and control by detecting reflected beam diameter variations at spaced predetermined locations in the system |
| US4621353A (en) * | 1982-09-09 | 1986-11-04 | Burroughs Corporation | Optical memory system providing improved focusing control and improved beam combining and separating apparatus |
| US4622659A (en) * | 1982-09-09 | 1986-11-11 | Burroughs Corporation | Focus detection and control apparatus for maintaining accurate focusing in an optical memory system by detecting reflected beam diameter variations at spaced predetermined locations |
| JPS6055521A (ja) * | 1983-09-05 | 1985-03-30 | Mitsubishi Electric Corp | 光デイスクヘツドの自動焦点調節装置 |
| DE3484723D1 (de) * | 1983-09-05 | 1991-07-25 | Mitsubishi Electric Corp | Automatisches fokussierungsverfahren. |
| NL8303560A (nl) * | 1983-10-17 | 1985-05-17 | Philips Nv | Inrichting voor het weergeven van informatie van een optisch uitleesbare registratiedrager. |
| US4740940A (en) * | 1985-03-11 | 1988-04-26 | Matsushita Electric Industrial Co., Ltd. | Optical information read apparatus |
| DE3852350T2 (de) * | 1987-07-22 | 1995-07-27 | Omron Tateisi Electronics Co | Gerät zur Feststellung der Neigung einer optischen Karte. |
| US5179268A (en) * | 1987-07-22 | 1993-01-12 | Omron Tateisi Electronic Co. | Apparatus for detecting inclination of an optical card |
| NL8702071A (nl) * | 1987-09-03 | 1989-04-03 | Philips Nv | Inrichting voor het puntsgewijs aftasten van een voorwerp. |
| US4998235A (en) * | 1987-11-17 | 1991-03-05 | Matsushita Electric Industrial Co., Ltd. | Focus detection system for an optical disk drive using photo sensor elements in the far field of information pits |
| US5031167A (en) * | 1988-05-26 | 1991-07-09 | Matsushita Electric Industrial Co., Ltd. | Focus error detection system for an optical recording/reproducing system |
| JP2589814B2 (ja) * | 1989-07-19 | 1997-03-12 | 松下電器産業株式会社 | クロック抽出装置およびトラッキング誤差信号採取装置 |
| JPH0770073B2 (ja) * | 1989-08-04 | 1995-07-31 | 松下電器産業株式会社 | 光学ヘッド |
| EP1034537A2 (en) | 1998-06-15 | 2000-09-13 | Koninklijke Philips Electronics N.V. | Device for scanning an optical record carrier |
| US6781104B1 (en) | 1998-06-16 | 2004-08-24 | Koninklijke Philips Electronics N.V. | Device for scanning an optical record carrier |
| EP0965981A3 (en) * | 1998-06-16 | 2009-11-25 | Koninklijke Philips Electronics N.V. | Device for scanning an optical record carrier |
| JP5207240B2 (ja) * | 2008-08-11 | 2013-06-12 | 学校法人金井学園 | 光記録再生媒体の焦点誤差検出方法、およびそれに用いる発光装置のビーム分割調節器 |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2070474A5 (es) * | 1969-12-05 | 1971-09-10 | Anvar | |
| NL160138C (nl) * | 1972-05-11 | 1979-09-17 | Philips Nv | Inrichting voor het uitlezen van een vlakke registratie- drager. |
| AR205243A1 (es) * | 1972-05-11 | 1976-04-21 | Philips Nv | Aparato para la lectura de un portador de grabacion reflector plano |
| FR2266932B1 (es) * | 1973-03-02 | 1977-09-02 | Thomson Brandt | |
| FR2235448B1 (es) * | 1973-06-29 | 1976-05-07 | Thomson Brandt | |
| US3932700A (en) * | 1974-02-04 | 1976-01-13 | Zenith Radio Corporation | Focus tracking registration for optical reproducing systems |
| NL7413044A (nl) * | 1974-10-03 | 1976-04-06 | Philips Nv | Registratiedrager waarop een televisiesignaal is opgeslagen. |
| NL7413162A (nl) * | 1974-10-07 | 1976-04-09 | Philips Nv | Inrichting voor het uitlezen van een schijf- vormige registratiedrager. |
| NL182257C (nl) * | 1974-12-23 | 1988-02-01 | Philips Nv | Inrichting voor het uitlezen van een vlakke reflekterende registratiedrager waarop informatie is aangebracht in een optisch uitleesbare struktuur. |
| NL177157C (nl) * | 1975-02-28 | 1985-08-01 | Philips Nv | Inrichting voor het uitlezen van een vlakke registratiedrager met een optisch uitleesbare informatiestruktuur. |
-
1976
- 1976-01-28 NL NL7600843A patent/NL7600843A/xx unknown
- 1976-03-23 US US05/669,641 patent/US4051527A/en not_active Expired - Lifetime
-
1977
- 1977-01-03 ZA ZA00770010A patent/ZA7710B/xx unknown
- 1977-01-15 DE DE2701538A patent/DE2701538C3/de not_active Expired
- 1977-01-24 MX MX167801A patent/MX144032A/es unknown
- 1977-01-25 CH CH89277A patent/CH620541A5/de not_active IP Right Cessation
- 1977-01-25 DK DK30677A patent/DK145866C/da not_active IP Right Cessation
- 1977-01-25 BR BR7700453A patent/BR7700453A/pt unknown
- 1977-01-25 NZ NZ183153A patent/NZ183153A/xx unknown
- 1977-01-25 AU AU21617/77A patent/AU505467B2/en not_active Expired
- 1977-01-25 IT IT19599/77A patent/IT1084008B/it active
- 1977-01-25 GB GB2944/77A patent/GB1572409A/en not_active Expired
- 1977-01-25 PL PL1977195542A patent/PL108352B1/pl unknown
- 1977-01-25 NO NO770239A patent/NO149794C/no unknown
- 1977-01-25 SE SE7700726A patent/SE417555B/xx unknown
- 1977-01-26 CA CA270,466A patent/CA1096494A/en not_active Expired
- 1977-01-26 ES ES455361A patent/ES455361A1/es not_active Expired
- 1977-01-26 AT AT45977A patent/AT349230B/de not_active IP Right Cessation
- 1977-01-26 BE BE174407A patent/BE850782A/xx not_active IP Right Cessation
- 1977-01-26 JP JP686877A patent/JPS5293223A/ja active Granted
- 1977-01-27 AR AR266332A patent/AR217251A1/es active
- 1977-01-27 FR FR7702259A patent/FR2339929A1/fr active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| SE7700726L (sv) | 1977-07-29 |
| ES455361A1 (es) | 1978-01-01 |
| ZA7710B (en) | 1978-08-30 |
| AU2161777A (en) | 1978-08-03 |
| FR2339929A1 (fr) | 1977-08-26 |
| NZ183153A (en) | 1980-03-05 |
| NL7600843A (nl) | 1977-08-01 |
| NO149794C (no) | 1984-06-27 |
| NO149794B (no) | 1984-03-12 |
| SE417555B (sv) | 1981-03-23 |
| DK145866C (da) | 1983-09-05 |
| AT349230B (de) | 1979-03-26 |
| DK30677A (da) | 1977-07-29 |
| FR2339929B1 (es) | 1981-09-18 |
| JPS5631651B2 (es) | 1981-07-22 |
| AR217251A1 (es) | 1980-03-14 |
| DE2701538C3 (de) | 1981-09-10 |
| US4051527A (en) | 1977-09-27 |
| ATA45977A (de) | 1978-08-15 |
| BE850782A (fr) | 1977-07-26 |
| BR7700453A (pt) | 1977-10-04 |
| PL108352B1 (en) | 1980-04-30 |
| DE2701538B2 (de) | 1980-12-04 |
| AU505467B2 (en) | 1979-11-22 |
| IT1084008B (it) | 1985-05-25 |
| DE2701538A1 (de) | 1977-08-04 |
| NO770239L (no) | 1977-07-29 |
| CA1096494A (en) | 1981-02-24 |
| DK145866B (da) | 1983-03-21 |
| JPS5293223A (en) | 1977-08-05 |
| GB1572409A (en) | 1980-07-30 |
| MX144032A (es) | 1981-08-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PL | Patent ceased |