DE3023779C2 - Verfahren und Vorrichtung zum Erzeugen eines Fokussierfehlersignales für ein Objektiv - Google Patents
Verfahren und Vorrichtung zum Erzeugen eines Fokussierfehlersignales für ein ObjektivInfo
- Publication number
- DE3023779C2 DE3023779C2 DE19803023779 DE3023779A DE3023779C2 DE 3023779 C2 DE3023779 C2 DE 3023779C2 DE 19803023779 DE19803023779 DE 19803023779 DE 3023779 A DE3023779 A DE 3023779A DE 3023779 C2 DE3023779 C2 DE 3023779C2
- Authority
- DE
- Germany
- Prior art keywords
- light
- prism
- reflected
- reflection surface
- lens
- 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.)
- Expired
Links
- 238000000034 method Methods 0.000 title claims description 22
- 230000004907 flux Effects 0.000 claims description 48
- 230000003287 optical effect Effects 0.000 claims description 47
- 238000001514 detection method Methods 0.000 claims description 29
- 230000010287 polarization Effects 0.000 claims description 15
- 230000008859 change Effects 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 230000007423 decrease Effects 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 101100069824 Escherichia coli (strain K12) gutM gene Proteins 0.000 description 1
- 206010034960 Photophobia Diseases 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 208000013469 light sensitivity Diseases 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
- G11B7/08—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 (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7994379A JPS567246A (en) | 1979-06-25 | 1979-06-25 | Method and unit for focus detection |
| JP13699679A JPS5661044A (en) | 1979-10-25 | 1979-10-25 | Optical information reader |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE3023779A1 DE3023779A1 (de) | 1981-02-05 |
| DE3023779C2 true DE3023779C2 (de) | 1987-01-22 |
Family
ID=33133247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19803023779 Expired DE3023779C2 (de) | 1979-06-25 | 1980-06-25 | Verfahren und Vorrichtung zum Erzeugen eines Fokussierfehlersignales für ein Objektiv |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE3023779C2 (US07696358-20100413-C00002.png) |
| FR (1) | FR2459991A1 (US07696358-20100413-C00002.png) |
| GB (1) | GB2057218B (US07696358-20100413-C00002.png) |
| NL (1) | NL192406C (US07696358-20100413-C00002.png) |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5752005A (en) * | 1980-08-19 | 1982-03-27 | Olympus Optical Co Ltd | Focus detecting method |
| JPS5752006A (en) * | 1980-08-19 | 1982-03-27 | Olympus Optical Co Ltd | Method and device for detecting focus |
| 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 |
| EP0068390B1 (en) * | 1981-06-22 | 1990-08-22 | Kabushiki Kaisha Toshiba | An optical head |
| EP0075192B1 (en) * | 1981-09-17 | 1990-03-14 | Kabushiki Kaisha Toshiba | 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 (ja) * | 1982-08-24 | 1984-02-28 | Matsushita Electric Ind Co Ltd | 光デイスク記録再生方法 |
| GB2135150A (en) * | 1983-02-15 | 1984-08-22 | Gen Electric | Optical inspection system |
| JPS59162514A (ja) * | 1983-03-08 | 1984-09-13 | Dainippon Screen Mfg Co Ltd | 画像走査記録装置における焦点調整方法 |
| JPS61105736A (ja) * | 1984-10-29 | 1986-05-23 | Pioneer Electronic Corp | フオ−カス制御装置 |
| 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 |
| US5202789A (en) * | 1987-10-16 | 1993-04-13 | Kabushiki Kaisha Toshiba | Optical system for preserving a state of polarization of light beam |
| JP2603973B2 (ja) * | 1987-10-16 | 1997-04-23 | 株式会社東芝 | 光学ヘッド |
| 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 (de) * | 1972-12-11 | 1981-10-08 | Ernst Leitz Wetzlar Gmbh, 6330 Wetzlar | Verfahren und Einrichtung zur Scharfeinstellung eines Objektivs |
| 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/fr active Granted
- 1980-06-24 NL NL8003659A patent/NL192406C/nl not_active IP Right Cessation
- 1980-06-25 DE DE19803023779 patent/DE3023779C2/de not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB2057218B (en) | 1984-02-29 |
| NL192406B (nl) | 1997-03-03 |
| NL8003659A (nl) | 1980-12-30 |
| DE3023779A1 (de) | 1981-02-05 |
| NL192406C (nl) | 1997-07-04 |
| FR2459991B1 (US07696358-20100413-C00002.png) | 1984-11-30 |
| GB2057218A (en) | 1981-03-25 |
| FR2459991A1 (fr) | 1981-01-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| OAR | Request for search filed | ||
| OC | Search report available | ||
| 8125 | Change of the main classification | ||
| 8110 | Request for examination paragraph 44 | ||
| D2 | Grant after examination | ||
| 8364 | No opposition during term of opposition | ||
| 8339 | Ceased/non-payment of the annual fee |