NL192406B - Device for detecting a focusing error signal for an objective lens when scanning an information carrier. - Google Patents
Device for detecting a focusing error signal for an objective lens when scanning an information carrier.Info
- Publication number
- NL192406B NL192406B NL8003659A NL8003659A NL192406B NL 192406 B NL192406 B NL 192406B NL 8003659 A NL8003659 A NL 8003659A NL 8003659 A NL8003659 A NL 8003659A NL 192406 B NL192406 B NL 192406B
- Authority
- NL
- Netherlands
- Prior art keywords
- scanning
- detecting
- objective lens
- error signal
- information carrier
- Prior art date
Links
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
- G11B7/08—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
- G11B7/0908—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 for focusing only
- G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
-
- 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
-
- 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
- G11B7/0908—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 for focusing only
- G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
- G11B2007/0924—Skewed beams methods (using an angled beam, i.e. a beam which is reflected from the disc at an angle different from 90°)
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7994379A JPS567246A (en) | 1979-06-25 | 1979-06-25 | Method and unit for focus detection |
| JP7994379 | 1979-06-25 | ||
| JP13699679 | 1979-10-25 | ||
| JP13699679A JPS5661044A (en) | 1979-10-25 | 1979-10-25 | Optical information reader |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| NL8003659A NL8003659A (en) | 1980-12-30 |
| NL192406B true NL192406B (en) | 1997-03-03 |
| NL192406C NL192406C (en) | 1997-07-04 |
Family
ID=33133247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL8003659A NL192406C (en) | 1979-06-25 | 1980-06-24 | Device for detecting a focusing error signal for an objective lens when scanning an information carrier. |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE3023779A1 (en) |
| FR (1) | FR2459991A1 (en) |
| GB (1) | GB2057218B (en) |
| NL (1) | NL192406C (en) |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5752006A (en) * | 1980-08-19 | 1982-03-27 | Olympus Optical Co Ltd | Method and device for detecting focus |
| JPS5752005A (en) * | 1980-08-19 | 1982-03-27 | Olympus Optical Co Ltd | Focus detecting method |
| JPS5744236A (en) * | 1980-08-29 | 1982-03-12 | Matsushita Electric Ind Co Ltd | Optical information reproducer |
| JPS5774837A (en) * | 1980-10-25 | 1982-05-11 | Olympus Optical Co Ltd | Signal detection system of optical information reproducing device |
| US4505584A (en) * | 1981-01-22 | 1985-03-19 | Olympus Optical Co., Ltd. | Method and apparatus for detecting focussing error signal of objective lens |
| JPS57189348A (en) * | 1981-05-14 | 1982-11-20 | Olympus Optical Co Ltd | Auto-focus system of optical disk |
| DE3280232D1 (en) * | 1981-06-22 | 1990-09-27 | Toshiba Kawasaki Kk | OPTICAL HEAD. |
| DE3280137D1 (en) * | 1981-09-17 | 1990-04-19 | Toshiba Kawasaki Kk | AN OPTICAL HEAD. |
| EP0089804B1 (en) * | 1982-03-19 | 1986-06-04 | Olympus Optical Co., Ltd. | Focus state detector |
| GB2122835B (en) * | 1982-06-30 | 1986-08-06 | Eastman Kodak Co | Rangefinder |
| JPS5936338A (en) * | 1982-08-24 | 1984-02-28 | Matsushita Electric Ind Co Ltd | Optical disk recording and reproducing method |
| GB2135150A (en) * | 1983-02-15 | 1984-08-22 | Gen Electric | Optical inspection system |
| JPS59162514A (en) * | 1983-03-08 | 1984-09-13 | Dainippon Screen Mfg Co Ltd | Focus adjusting method of image scanning and recording device |
| JPS61105736A (en) * | 1984-10-29 | 1986-05-23 | Pioneer Electronic Corp | Focus controller |
| US4778984A (en) * | 1985-10-16 | 1988-10-18 | Canon Denshi Kabushiki Kaisha | Apparatus for detecting focus from astigmatism |
| HU201403B (en) * | 1987-06-05 | 1990-10-28 | Videoton Elekt Vallalat | Process and device for determining diameter of light beams |
| JP2603973B2 (en) * | 1987-10-16 | 1997-04-23 | 株式会社東芝 | Optical head |
| US5202789A (en) * | 1987-10-16 | 1993-04-13 | Kabushiki Kaisha Toshiba | Optical system for preserving a state of polarization of light beam |
| EP0439876A1 (en) * | 1990-01-29 | 1991-08-07 | Hitachi Maxell Ltd. | Optical head with a double-beam splitter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2260474C3 (en) * | 1972-12-11 | 1981-10-08 | Ernst Leitz Wetzlar Gmbh, 6330 Wetzlar | Method and device for focusing a lens |
| GB1603596A (en) * | 1977-06-06 | 1981-11-25 | Mca Disco Vision | Optical transducer and focusing system |
-
1980
- 1980-06-19 GB GB8020097A patent/GB2057218B/en not_active Expired
- 1980-06-24 FR FR8014007A patent/FR2459991A1/en active Granted
- 1980-06-24 NL NL8003659A patent/NL192406C/en not_active IP Right Cessation
- 1980-06-25 DE DE19803023779 patent/DE3023779A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| GB2057218A (en) | 1981-03-25 |
| GB2057218B (en) | 1984-02-29 |
| DE3023779C2 (en) | 1987-01-22 |
| FR2459991B1 (en) | 1984-11-30 |
| DE3023779A1 (en) | 1981-02-05 |
| FR2459991A1 (en) | 1981-01-16 |
| NL192406C (en) | 1997-07-04 |
| NL8003659A (en) | 1980-12-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| BT | A document has been added to the application laid open to public inspection | ||
| A85 | Still pending on 85-01-01 | ||
| BA | A request for search or an international-type search has been filed | ||
| BB | A search report has been drawn up | ||
| BC | A request for examination has been filed | ||
| V1 | Lapsed because of non-payment of the annual fee |
Effective date: 20000101 |