HK15896A - Method for reducing noise in a data signal and optical pick-ip device - Google Patents
Method for reducing noise in a data signal and optical pick-ip deviceInfo
- Publication number
- HK15896A HK15896A HK15896A HK15896A HK15896A HK 15896 A HK15896 A HK 15896A HK 15896 A HK15896 A HK 15896A HK 15896 A HK15896 A HK 15896A HK 15896 A HK15896 A HK 15896A
- Authority
- HK
- Hong Kong
- Prior art keywords
- data signal
- recording medium
- data
- signal
- photodetector
- Prior art date
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
- 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
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
- G11B7/1263—Power control during transducing, e.g. by monitoring
-
- 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
-
- 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
- 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
- G11B11/10595—Control of operating function
-
- 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
- G11B11/10595—Control of operating function
- G11B11/10597—Adaptations for transducing various formats on the same or different carriers
-
- 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
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B13/00—Recording simultaneously or selectively by methods covered by different main groups among G11B3/00, G11B5/00, G11B7/00 and G11B9/00; Record carriers therefor not otherwise provided for; Reproducing therefrom not otherwise provided for
- G11B13/04—Recording simultaneously or selectively by methods covered by different main groups among G11B3/00, G11B5/00, G11B7/00 and G11B9/00; Record carriers therefor not otherwise provided for; Reproducing therefrom not otherwise provided for magnetically or by magnetisation and optically or by radiation, for changing or sensing optical properties
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Sampling And Sample Adjustment (AREA)
- Optical Head (AREA)
- Optical Recording Or Reproduction (AREA)
- Optical Communication System (AREA)
- Wire Bonding (AREA)
- Geophysics And Detection Of Objects (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19873732874 DE3732874A1 (de) | 1987-09-30 | 1987-09-30 | Optische abtastvorrichtung |
Publications (1)
Publication Number | Publication Date |
---|---|
HK15896A true HK15896A (en) | 1996-02-02 |
Family
ID=6337169
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
HK13596A HK13596A (en) | 1987-09-30 | 1996-01-25 | Optical pick-up device and method for an optical pick-up device |
HK15896A HK15896A (en) | 1987-09-30 | 1996-01-25 | Method for reducing noise in a data signal and optical pick-ip device |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
HK13596A HK13596A (en) | 1987-09-30 | 1996-01-25 | Optical pick-up device and method for an optical pick-up device |
Country Status (12)
Country | Link |
---|---|
US (1) | US5014253A (xx) |
EP (2) | EP0310795B1 (xx) |
JP (2) | JPH01166351A (xx) |
KR (2) | KR970007167B1 (xx) |
AT (2) | ATE86777T1 (xx) |
DE (3) | DE3732874A1 (xx) |
DK (2) | DK548388A (xx) |
ES (2) | ES2039531T3 (xx) |
GR (1) | GR3004667T3 (xx) |
HK (2) | HK13596A (xx) |
HU (2) | HUT61121A (xx) |
MY (2) | MY103615A (xx) |
Families Citing this family (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5325350A (en) * | 1986-09-28 | 1994-06-28 | Deutsche Thomson-Brandt Gmbh | Pick-up for selectively reading and writing an optical recording medium having pits and magnetic domains |
JPH0340252A (ja) * | 1989-04-19 | 1991-02-21 | Olympus Optical Co Ltd | 光磁気記録媒体の位相差測定装置 |
DE3923328A1 (de) * | 1989-07-14 | 1991-01-24 | Thomson Brandt Gmbh | Magneto-optisches aufnahme- und/oder wiedergabegeraet |
NL8902728A (nl) * | 1989-11-06 | 1991-06-03 | Philips Nv | Werkwijze en inrichting voor het inschrijven en uitlezen van een magneto-optische registratiedrager. |
US5105415A (en) * | 1989-12-11 | 1992-04-14 | International Business Machines Corporation | Detecting magnetooptic and intensity-modulated optical signals with the same detector |
EP0447265B1 (en) * | 1990-03-16 | 1997-05-21 | Canon Kabushiki Kaisha | Optical information recording/reproducing apparatus |
US5712840A (en) * | 1990-03-16 | 1998-01-27 | Canon Kabushiki Kaisha | Optical information recording/reproduciing apparatus having two-division detectors |
JP2809835B2 (ja) * | 1990-07-30 | 1998-10-15 | 松下電器産業株式会社 | 光ディスク装置および光ディスク |
DE4127840A1 (de) * | 1991-08-22 | 1993-02-25 | Thomson Brandt Gmbh | Optische abtastvorrichtung |
DE4140806A1 (de) * | 1991-12-11 | 1993-06-17 | Thomson Brandt Gmbh | Optische abtastvorrichtung |
US5265085A (en) * | 1992-06-15 | 1993-11-23 | International Business Machines | Simultaneous MO and ROM optical disk signal detection |
DE4220486A1 (de) * | 1992-06-23 | 1994-01-05 | Thomson Brandt Gmbh | Aufzeichnung und Wiedergabe von Informationen bei ROM-RAM-Speichermedien |
DE4226777A1 (de) * | 1992-08-13 | 1994-02-17 | Thomson Brandt Gmbh | Rauschanteilverringerung im Datensignal und optische Abtastvorrichtung |
US5233175A (en) * | 1992-08-24 | 1993-08-03 | International Business Machines Corporation | Laser power control independent of beamsplitter transmissivity |
KR100230225B1 (ko) * | 1992-11-30 | 1999-11-15 | 윤종용 | 발광램프를 이용한 광픽업 |
JPH0714231A (ja) * | 1993-06-29 | 1995-01-17 | Sharp Corp | 光磁気ディスク、光ピックアップ及び光磁気ディスク装置 |
KR950013702B1 (ko) * | 1993-07-15 | 1995-11-13 | 엘지전자주식회사 | 광자기 디스크의 광픽업 장치 |
TW238381B (en) * | 1993-10-29 | 1995-01-11 | Ibm | Optical data storage cartridge system |
DE4415508A1 (de) | 1994-05-03 | 1995-11-09 | Thomson Brandt Gmbh | Abtastgerät mit Adaptation |
US5586101A (en) * | 1995-03-01 | 1996-12-17 | Eastman Kodak Company | Magneto-optic data storage system with differential detection channels having separate gain control circuit |
US5537383A (en) * | 1995-03-01 | 1996-07-16 | Eastman Kodak Company | Optical data storage system with differential data detection and source noise subtraction for use with magneto-optic, write-once and other optical media |
KR100423824B1 (ko) * | 1998-08-20 | 2004-03-22 | 마쯔시다덴기산교 가부시키가이샤 | 레이저 파워 제어 장치 및 광 디스크 장치 |
WO2003060897A1 (fr) | 2002-01-11 | 2003-07-24 | Fujitsu Limited | Dispositif de stockage |
JP3913671B2 (ja) * | 2002-12-09 | 2007-05-09 | 株式会社リコー | 情報記録方法および情報記録再生装置 |
US7763198B2 (en) * | 2005-04-12 | 2010-07-27 | Abbott Cardiovascular Systems Inc. | Method for retaining a vascular stent on a catheter |
KR100791083B1 (ko) * | 2007-10-17 | 2008-01-03 | 대원계전주식회사 | 전원 개폐용 스위치 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5923013B2 (ja) * | 1977-05-31 | 1984-05-30 | 日本電信電話株式会社 | 光学的信号再生装置 |
JPS54143109A (en) * | 1978-04-28 | 1979-11-08 | Hitachi Ltd | Optical information device |
DE2953304C2 (de) * | 1978-11-01 | 1985-08-08 | Hitachi, Ltd., Tokio/Tokyo | Vorrichtung zum Lesen von magnetisch gespeicherter Information |
JPS57147148A (en) * | 1981-03-05 | 1982-09-10 | Olympus Optical Co Ltd | Information reproducer with magnetooptic system |
JPS5979446A (ja) * | 1982-10-28 | 1984-05-08 | Sharp Corp | 磁気光学ヘッド |
JPS6035351A (ja) * | 1983-08-06 | 1985-02-23 | Brother Ind Ltd | 光磁気再生装置 |
JPH0664765B2 (ja) * | 1984-06-29 | 1994-08-22 | 株式会社日立製作所 | 情報記録再生装置 |
JPS61222037A (ja) * | 1985-03-27 | 1986-10-02 | Toshiba Corp | デイスク装置 |
FR2597643A1 (fr) * | 1985-11-08 | 1987-10-23 | Seiko Epson Corp | Systeme de lecture de signal magneto-optique |
JPS62110643A (ja) * | 1985-11-08 | 1987-05-21 | Seiko Epson Corp | 光磁気信号検出方法 |
FR2591787A1 (fr) * | 1985-12-13 | 1987-06-19 | Thomson Csf | Dispositif d'enregistrement-lecture polyvalent de support d'enregistrement |
JPS62170054A (ja) * | 1986-01-21 | 1987-07-27 | Seiko Epson Corp | 光学ヘツド |
-
1987
- 1987-09-30 DE DE19873732874 patent/DE3732874A1/de not_active Withdrawn
-
1988
- 1988-08-19 ES ES198888113490T patent/ES2039531T3/es not_active Expired - Lifetime
- 1988-08-19 DE DE8888113490T patent/DE3879073D1/de not_active Expired - Lifetime
- 1988-08-19 EP EP88113490A patent/EP0310795B1/de not_active Expired - Lifetime
- 1988-08-19 AT AT88113490T patent/ATE86777T1/de not_active IP Right Cessation
- 1988-08-31 ES ES198888114162T patent/ES2031193T3/es not_active Expired - Lifetime
- 1988-08-31 AT AT88114162T patent/ATE74682T1/de not_active IP Right Cessation
- 1988-08-31 EP EP88114162A patent/EP0310812B1/de not_active Expired - Lifetime
- 1988-08-31 DE DE8888114162T patent/DE3869894D1/de not_active Expired - Lifetime
- 1988-09-28 US US07/250,777 patent/US5014253A/en not_active Expired - Fee Related
- 1988-09-29 KR KR1019880012601A patent/KR970007167B1/ko not_active IP Right Cessation
- 1988-09-29 KR KR1019880012602A patent/KR970007168B1/ko not_active IP Right Cessation
- 1988-09-30 HU HU885107A patent/HUT61121A/hu unknown
- 1988-09-30 JP JP63244643A patent/JPH01166351A/ja active Pending
- 1988-09-30 DK DK548388A patent/DK548388A/da not_active Application Discontinuation
- 1988-09-30 DK DK548188A patent/DK548188A/da not_active Application Discontinuation
- 1988-09-30 JP JP63244642A patent/JP3112907B2/ja not_active Expired - Fee Related
- 1988-09-30 MY MYPI88001100A patent/MY103615A/en unknown
- 1988-09-30 MY MYPI88001101A patent/MY103616A/en unknown
- 1988-09-30 HU HU885106A patent/HUT62723A/hu unknown
-
1992
- 1992-05-21 GR GR920400987T patent/GR3004667T3/el unknown
-
1996
- 1996-01-25 HK HK13596A patent/HK13596A/xx not_active IP Right Cessation
- 1996-01-25 HK HK15896A patent/HK15896A/xx not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
MY103615A (en) | 1993-08-28 |
ATE86777T1 (de) | 1993-03-15 |
EP0310795B1 (de) | 1993-03-10 |
DK548388A (da) | 1989-03-31 |
KR890005677A (ko) | 1989-05-16 |
HUT62723A (en) | 1993-05-28 |
US5014253A (en) | 1991-05-07 |
GR3004667T3 (xx) | 1993-04-28 |
JPH01166351A (ja) | 1989-06-30 |
ES2039531T3 (es) | 1993-10-01 |
EP0310812B1 (de) | 1992-04-08 |
ES2031193T3 (es) | 1992-12-01 |
DK548388D0 (da) | 1988-09-30 |
EP0310795A1 (de) | 1989-04-12 |
EP0310812A1 (de) | 1989-04-12 |
JPH01166350A (ja) | 1989-06-30 |
DE3732874A1 (de) | 1989-04-20 |
HK13596A (en) | 1996-02-02 |
KR970007168B1 (ko) | 1997-05-03 |
JP3112907B2 (ja) | 2000-11-27 |
MY103616A (en) | 1993-08-28 |
ATE74682T1 (de) | 1992-04-15 |
KR890005678A (ko) | 1989-05-16 |
KR970007167B1 (ko) | 1997-05-03 |
DE3869894D1 (de) | 1992-05-14 |
DE3879073D1 (de) | 1993-04-15 |
DK548188D0 (da) | 1988-09-30 |
HUT61121A (en) | 1992-11-30 |
DK548188A (da) | 1989-03-31 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PF | Patent in force | ||
PE | Patent expired |
Effective date: 20080830 |