JPS5419329B2 - - Google Patents
Info
- Publication number
- JPS5419329B2 JPS5419329B2 JP7154676A JP7154676A JPS5419329B2 JP S5419329 B2 JPS5419329 B2 JP S5419329B2 JP 7154676 A JP7154676 A JP 7154676A JP 7154676 A JP7154676 A JP 7154676A JP S5419329 B2 JPS5419329 B2 JP S5419329B2
- Authority
- JP
- Japan
- 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
Links
Classifications
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- 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
- G11B7/1392—Means for controlling the beam wavefront, e.g. for correction of aberration
- G11B7/13925—Means for controlling the beam wavefront, e.g. for correction of aberration active, e.g. controlled by electrical or mechanical means
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- 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
- G11B7/0945—Methods for initialising servos, start-up sequences
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- 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
- G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
- G11B7/1367—Stepped phase plates
-
- 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
- G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
- G11B2007/0006—Recording, reproducing or erasing systems characterised by the structure or type of the carrier adapted for scanning different types of carrier, e.g. CD & DVD
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7154676A JPS52153705A (en) | 1976-06-17 | 1976-06-17 | Optical disc regenerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7154676A JPS52153705A (en) | 1976-06-17 | 1976-06-17 | Optical disc regenerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS52153705A JPS52153705A (en) | 1977-12-21 |
| JPS5419329B2 true JPS5419329B2 (en) | 1979-07-14 |
Family
ID=13463834
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7154676A Granted JPS52153705A (en) | 1976-06-17 | 1976-06-17 | Optical disc regenerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS52153705A (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5728446U (en) * | 1980-07-21 | 1982-02-15 | ||
| NL8004379A (en) * | 1980-07-31 | 1982-03-01 | Philips Nv | DEVICE FOR RECORDING AND / OR READING INFORMATION ON A ROTATING DISC using a radiation beam. |
| JPH0354740A (en) * | 1989-07-24 | 1991-03-08 | Matsushita Electric Ind Co Ltd | Optical information recording member and optical information recording and reproducing device |
| JPH03156736A (en) * | 1989-11-14 | 1991-07-04 | Ricoh Co Ltd | Focus signal correcting method for optical pickup |
| US5148421A (en) * | 1990-04-20 | 1992-09-15 | Matsushita Electric Industrial Co., Ltd. | Optical head |
| US5202875A (en) * | 1991-06-04 | 1993-04-13 | International Business Machines Corporation | Multiple data surface optical data storage system |
| JP2986587B2 (en) * | 1991-08-21 | 1999-12-06 | 松下電器産業株式会社 | Optical information recording / reproducing device |
| JPH0777031B2 (en) * | 1991-10-16 | 1995-08-16 | インターナショナル・ビジネス・マシーンズ・コーポレイション | Aberration compensator |
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1976
- 1976-06-17 JP JP7154676A patent/JPS52153705A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS52153705A (en) | 1977-12-21 |