JPH0296622U - - Google Patents
Info
- Publication number
- JPH0296622U JPH0296622U JP1989003940U JP394089U JPH0296622U JP H0296622 U JPH0296622 U JP H0296622U JP 1989003940 U JP1989003940 U JP 1989003940U JP 394089 U JP394089 U JP 394089U JP H0296622 U JPH0296622 U JP H0296622U
- Authority
- JP
- Japan
- Prior art keywords
- semiconductor laser
- optical disk
- monitoring photodiode
- reflected
- disk device
- 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.)
- Pending
Links
- 239000004065 semiconductor Substances 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 1
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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1356—Double or multiple prisms, i.e. having two or more prisms in cooperation
-
- 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
- G11B11/10545—Heads for reproducing using optical beam of radiation interacting directly with the magnetisation on the record 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
- 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
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Head (AREA)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989003940U JPH0296622U (US20020193084A1-20021219-M00002.png) | 1989-01-18 | 1989-01-18 | |
| US07/462,004 US5146449A (en) | 1989-01-18 | 1990-01-08 | Optical disc apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989003940U JPH0296622U (US20020193084A1-20021219-M00002.png) | 1989-01-18 | 1989-01-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0296622U true JPH0296622U (US20020193084A1-20021219-M00002.png) | 1990-08-01 |
Family
ID=11571128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1989003940U Pending JPH0296622U (US20020193084A1-20021219-M00002.png) | 1989-01-18 | 1989-01-18 |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US5146449A (US20020193084A1-20021219-M00002.png) |
| JP (1) | JPH0296622U (US20020193084A1-20021219-M00002.png) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5311496A (en) * | 1992-11-13 | 1994-05-10 | Hyundai Electronics America | Achromatic expansion prism for magneto-optical drive |
| JPH06309685A (ja) * | 1993-04-26 | 1994-11-04 | Nippon Conlux Co Ltd | 光学式情報記録再生装置のレーザ出力制御装置 |
| DE4415508A1 (de) * | 1994-05-03 | 1995-11-09 | Thomson Brandt Gmbh | Abtastgerät mit Adaptation |
| US5598394A (en) * | 1994-05-19 | 1997-01-28 | Sanyo Electric Co., Ltd. | Optical pick-up |
| US5544143A (en) * | 1994-06-14 | 1996-08-06 | Eastman Kodak Company | Read/write laser-detector-grating unit (LDGU) with an orthogonally-arranged focus and tracking sensor system |
| JPH09509791A (ja) * | 1994-12-23 | 1997-09-30 | フィリップス エレクトロニクス ネムローゼ フェンノートシャップ | レーザ電力供給回路及びそのようなレーザ電力供給回路を具えた光学記録と読取との双方又はいずれか一方用装置 |
| 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 |
| JP3645319B2 (ja) * | 1995-07-31 | 2005-05-11 | 株式会社東芝 | 情報処理装置 |
| JP2002100068A (ja) * | 2000-09-26 | 2002-04-05 | Pioneer Electronic Corp | 光ピックアップ装置 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS421697Y1 (US20020193084A1-20021219-M00002.png) * | 1964-10-26 | 1967-02-02 | ||
| JPS5527464U (US20020193084A1-20021219-M00002.png) * | 1978-08-10 | 1980-02-22 | ||
| JPS61162838A (ja) * | 1985-01-12 | 1986-07-23 | Nippon Kogaku Kk <Nikon> | 光デイスク記録再生装置の光源駆動装置 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3705758A (en) * | 1969-12-30 | 1972-12-12 | Honeywell Inc | Apparatus for controlling a beam of coherent electro-magnetic waves |
| JPS5845005B2 (ja) * | 1976-09-14 | 1983-10-06 | 日本ビクター株式会社 | 光変調の変調度安定化装置 |
| JPS5827891B2 (ja) * | 1976-09-14 | 1983-06-13 | 日本ビクター株式会社 | レ−ザ光束の安定化装置 |
| DE3376172D1 (en) * | 1982-01-22 | 1988-05-05 | Hitachi Ltd | Method and apparatus for reducing semiconductor laser optical noise |
| DE3688276T2 (de) * | 1985-10-16 | 1993-07-29 | Sharp Kk | Steuervorrichtung des buendels fuer magnetooptisches plattenspeichersystem. |
-
1989
- 1989-01-18 JP JP1989003940U patent/JPH0296622U/ja active Pending
-
1990
- 1990-01-08 US US07/462,004 patent/US5146449A/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS421697Y1 (US20020193084A1-20021219-M00002.png) * | 1964-10-26 | 1967-02-02 | ||
| JPS5527464U (US20020193084A1-20021219-M00002.png) * | 1978-08-10 | 1980-02-22 | ||
| JPS61162838A (ja) * | 1985-01-12 | 1986-07-23 | Nippon Kogaku Kk <Nikon> | 光デイスク記録再生装置の光源駆動装置 |
Also Published As
| Publication number | Publication date |
|---|---|
| US5146449A (en) | 1992-09-08 |
