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 (pt-PT) | 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 (pt-PT) | 1989-01-18 | 1989-01-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0296622U true JPH0296622U (pt-PT) | 1990-08-01 |
Family
ID=11571128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1989003940U Pending JPH0296622U (pt-PT) | 1989-01-18 | 1989-01-18 |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US5146449A (pt-PT) |
| JP (1) | JPH0296622U (pt-PT) |
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 |
| EP0746888A1 (en) * | 1994-12-23 | 1996-12-11 | Koninklijke Philips Electronics N.V. | Laser power supply circuit as well as optical recording and/or reading device comprising such a laser power supply 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 |
| 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 (pt-PT) * | 1964-10-26 | 1967-02-02 | ||
| JPS5527464U (pt-PT) * | 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 |
| 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 |
| 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 |
| DE3376172D1 (en) * | 1982-01-22 | 1988-05-05 | Hitachi Ltd | Method and apparatus for reducing semiconductor laser optical noise |
| US4843604A (en) * | 1985-10-16 | 1989-06-27 | Sharp Kabushiki Kaisha | Beam controller for magneto-optical disc memory system |
-
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 (pt-PT) * | 1964-10-26 | 1967-02-02 | ||
| JPS5527464U (pt-PT) * | 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 |