ES2039517T3 - Procedimiento para amortiguar el ruido para un dispositivo de exploracion optica. - Google Patents
Procedimiento para amortiguar el ruido para un dispositivo de exploracion optica.Info
- Publication number
- ES2039517T3 ES2039517T3 ES198888111951T ES88111951T ES2039517T3 ES 2039517 T3 ES2039517 T3 ES 2039517T3 ES 198888111951 T ES198888111951 T ES 198888111951T ES 88111951 T ES88111951 T ES 88111951T ES 2039517 T3 ES2039517 T3 ES 2039517T3
- Authority
- ES
- Spain
- Prior art keywords
- photodetector
- order
- recording medium
- data signal
- optical recording
- 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 - Lifetime
Links
Classifications
-
- 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
-
- 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
- G11B11/10532—Heads
-
- 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
- G11B11/10532—Heads
- G11B11/10541—Heads for reproducing
- G11B11/10543—Heads for reproducing using optical beam of radiation
-
- 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
Abstract
EN UN DISPOSITIVO EXPLORADOR OPTICO PARA LA EXPLORACION DE UN SOPORTE REGISTRADOR MAGNETO-OPTICO (6) SE REFLEJA SEGUN EL METODO DE TRES RAYAS UN TAL RAYO PRINCIPAL, CUYO PLANO DE POLARIZACION ESTA GIRATORIO EN EL OTRO SENTIDO, POR UN SOPORTE REGISTRADOR MAGNETO-OPTICO SOBRE EL SEGUNDO FOTODETECTOR (12). LA SEÑAL DE DATOS SE FORMA DE LA DIFERENCIA DEL FOTOVOLTAJE DEL PRIMER Y DEL SEGUNDO FOTODETECTOR. PARA EVITAR LOS RUIDOS ESTORBADOS EN LA SEÑAL DE DATOS, SE AJUSTA EL SEGUNDO FOTODETECTOR TAN EXACTAMENTE, QUE SOBRE EL SOLO EL RAYO PRINCIPAL, Y NO LOS PRODUCTOS DE DIFRACCION CAEN EN ARREGLO MAS ALTOS O MAS BAJOS QUE O. PARA REDUCIR EL RUIDO EN LA SEÑAL DE DATOS S, SIN QUE NECESITE EL AJUSTE EXACTO SOBRE EL SEGUNDO FOTODETECTOR (12) DEL SOPORTE REGISTRADOR MAGNETO-OPTICO (6) TAMBIEN LOS RAYOS MAS ALTOS QUE +1 Y MAS BAJOS QUE -1 DEL ORDEN. PARA LA PRODUCCION DE LA SEÑAL DE DATOS (S) ESTRAEN FOTOVOLTAJES PRODUCIDOS DEL FOTOVOLTAJE DEL SEGUNDO FOTODETECTOR (12) AL MENOS DEL ORDEN DE LOS RAYOS +1 Y -1. POR ESO SE PUEDE ELEGIR EL SEGUNDO FOTODETECTOR RELATIVAMENTE GRANDE Y QUE NO NECESITA AJUSTE EXACTO.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19873732944 DE3732944A1 (de) | 1987-09-30 | 1987-09-30 | Optische abtastvorrichtung |
Publications (1)
Publication Number | Publication Date |
---|---|
ES2039517T3 true ES2039517T3 (es) | 1993-10-01 |
Family
ID=6337224
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES198888111951T Expired - Lifetime ES2039517T3 (es) | 1987-09-30 | 1988-07-25 | Procedimiento para amortiguar el ruido para un dispositivo de exploracion optica. |
Country Status (10)
Country | Link |
---|---|
US (1) | US4959821A (es) |
EP (1) | EP0309675B1 (es) |
JP (1) | JP2907842B2 (es) |
KR (1) | KR960016890B1 (es) |
CN (1) | CN1012115B (es) |
AT (1) | ATE86776T1 (es) |
DE (2) | DE3732944A1 (es) |
DK (1) | DK547988A (es) |
ES (1) | ES2039517T3 (es) |
HU (1) | HUT61120A (es) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5644554A (en) * | 1988-01-19 | 1997-07-01 | Hitachi, Ltd. | Magnetic head load/unload device, method and a magneto-optical disk apparatus using the same |
US5182735A (en) * | 1989-03-06 | 1993-01-26 | Eastman Kodak Company | Magneto-optic readout apparatus using polarization switching of readout beam |
US5235570A (en) * | 1989-03-06 | 1993-08-10 | Eastman Kodak Company | Magneto-optic readout method and apparatus using polarization switching of readout beam |
DE69126160T2 (de) * | 1990-03-16 | 1997-10-09 | Canon Kk | Aufzeichnungs-/Wiedergabegerät für optische Information |
US5712840A (en) * | 1990-03-16 | 1998-01-27 | Canon Kabushiki Kaisha | Optical information recording/reproduciing apparatus having two-division detectors |
US5119352A (en) * | 1990-08-17 | 1992-06-02 | Hewlett-Packard Company | Magneto optic data storage read out apparatus and method |
DE4026875A1 (de) * | 1990-08-25 | 1992-02-27 | Thomson Brandt Gmbh | Optische abtastvorrichtung |
MY139798A (en) * | 1991-06-04 | 2009-10-30 | Mitsubishi Electric Corp | Multiple data surface data storage system and method |
DE4205851C2 (de) * | 1992-02-26 | 1995-10-12 | Flachglas Ag | In die Fensteröffnung einer metallischen Kraftfahrzeugkarosserie einzusetzende Antennenscheibe |
JPH05282723A (ja) * | 1992-03-31 | 1993-10-29 | Matsushita Electric Ind Co Ltd | 光磁気ヘッド装置 |
EP0582059B1 (en) * | 1992-06-02 | 1998-05-13 | Nec Corporation | Magneto-optical head assembly |
US5349576A (en) * | 1992-07-27 | 1994-09-20 | Eastman Kodak Company | Apparatus and method for polarization switching of a readout beam in a magneto-optic storage system |
DE4226777A1 (de) * | 1992-08-13 | 1994-02-17 | Thomson Brandt Gmbh | Rauschanteilverringerung im Datensignal und optische Abtastvorrichtung |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5963040A (ja) * | 1982-09-16 | 1984-04-10 | Canon Inc | 光磁気情報読取装置 |
JPS5958637A (ja) * | 1982-09-28 | 1984-04-04 | Sony Corp | 光学式再生装置 |
US4691308A (en) * | 1984-04-19 | 1987-09-01 | Nippon Kogaku K. K. | Apparatus for reproducing information from magnetooptical recording medium |
-
1987
- 1987-09-30 DE DE19873732944 patent/DE3732944A1/de not_active Withdrawn
-
1988
- 1988-07-25 AT AT88111951T patent/ATE86776T1/de not_active IP Right Cessation
- 1988-07-25 ES ES198888111951T patent/ES2039517T3/es not_active Expired - Lifetime
- 1988-07-25 EP EP88111951A patent/EP0309675B1/de not_active Expired - Lifetime
- 1988-07-25 DE DE8888111951T patent/DE3879064D1/de not_active Expired - Lifetime
- 1988-09-21 CN CN88106783A patent/CN1012115B/zh not_active Expired
- 1988-09-27 JP JP63239900A patent/JP2907842B2/ja not_active Expired - Lifetime
- 1988-09-28 US US07/250,728 patent/US4959821A/en not_active Expired - Lifetime
- 1988-09-29 HU HU885072A patent/HUT61120A/hu unknown
- 1988-09-30 DK DK547988A patent/DK547988A/da not_active Application Discontinuation
- 1988-09-30 KR KR1019880012767A patent/KR960016890B1/ko not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DE3879064D1 (de) | 1993-04-15 |
JP2907842B2 (ja) | 1999-06-21 |
JPH01106348A (ja) | 1989-04-24 |
KR960016890B1 (ko) | 1996-12-26 |
EP0309675B1 (de) | 1993-03-10 |
KR890005686A (ko) | 1989-05-16 |
DK547988A (da) | 1989-03-31 |
EP0309675A1 (de) | 1989-04-05 |
US4959821A (en) | 1990-09-25 |
DK547988D0 (da) | 1988-09-30 |
ATE86776T1 (de) | 1993-03-15 |
HUT61120A (en) | 1992-11-30 |
CN1032599A (zh) | 1989-04-26 |
DE3732944A1 (de) | 1989-04-13 |
CN1012115B (zh) | 1991-03-20 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
FG2A | Definitive protection |
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