DE3679460D1 - Optischer aufnahmekopf mit astigmatischer fokussierung. - Google Patents
Optischer aufnahmekopf mit astigmatischer fokussierung.Info
- Publication number
- DE3679460D1 DE3679460D1 DE8686305271T DE3679460T DE3679460D1 DE 3679460 D1 DE3679460 D1 DE 3679460D1 DE 8686305271 T DE8686305271 T DE 8686305271T DE 3679460 T DE3679460 T DE 3679460T DE 3679460 D1 DE3679460 D1 DE 3679460D1
- Authority
- DE
- Germany
- Prior art keywords
- optical receiving
- receiving head
- astigmatic focusing
- astigmatic
- focusing
- 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 - Fee Related
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
- G11B7/12—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
- G11B7/1381—Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops
-
- 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
- G11B7/0909—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 by astigmatic methods
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
- Automatic Focus Adjustment (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60149833A JPS629537A (ja) | 1985-07-08 | 1985-07-08 | 光学式ピツクアツプ装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE3679460D1 true DE3679460D1 (de) | 1991-07-04 |
Family
ID=15483657
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE8686305271T Expired - Fee Related DE3679460D1 (de) | 1985-07-08 | 1986-07-08 | Optischer aufnahmekopf mit astigmatischer fokussierung. |
Country Status (4)
Country | Link |
---|---|
US (1) | US4731527A (de) |
EP (1) | EP0208538B1 (de) |
JP (1) | JPS629537A (de) |
DE (1) | DE3679460D1 (de) |
Families Citing this family (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4778984A (en) * | 1985-10-16 | 1988-10-18 | Canon Denshi Kabushiki Kaisha | Apparatus for detecting focus from astigmatism |
US5189651A (en) * | 1986-05-12 | 1993-02-23 | Pioneer Electronic Corporation | Optical system in magneto-optical recording and reproducing device |
JPH0514334Y2 (de) * | 1986-10-01 | 1993-04-16 | ||
US4886959A (en) * | 1986-11-27 | 1989-12-12 | Canon Kabushiki Kaisha | Optical information reproducing apparatus |
US4973836A (en) * | 1987-03-31 | 1990-11-27 | Canon Kabushiki Kaisha | Optical pickup device including a beam splitter having an inclined plane |
JP2735220B2 (ja) * | 1987-12-02 | 1998-04-02 | 株式会社日立製作所 | 非点収差を有する光束を用いた焦点ずれ検出方法及び光ディスク装置 |
DE68909663T2 (de) * | 1988-04-26 | 1994-04-07 | Philips Nv | Anordnung zum optischen Abtasten eines magneto-optischen Aufzeichnungsträgers. |
JPH0677332B2 (ja) * | 1988-05-31 | 1994-09-28 | 株式会社三協精機製作所 | 光ピックアップ |
US5036185A (en) * | 1988-12-27 | 1991-07-30 | Kabushiki Kaisha Toshiba | Optical apparatus for detecting a focusing state |
US5189452A (en) * | 1991-12-09 | 1993-02-23 | General Electric Company | Real image projection system |
JPH05173068A (ja) * | 1991-12-20 | 1993-07-13 | Olympus Optical Co Ltd | 小型ズームレンズ |
DE19501884B4 (de) * | 1994-02-03 | 2005-07-21 | Carl Zeiss | Optische Anordnung |
JP3456809B2 (ja) * | 1995-10-30 | 2003-10-14 | シャープ株式会社 | 光導波路素子、光導波路素子への結合方法、光ピックアップ装置 |
JP3617256B2 (ja) * | 1997-06-20 | 2005-02-02 | ソニー株式会社 | 光ピックアップ及び光ピックアップの製造方法 |
JP3626003B2 (ja) * | 1997-10-06 | 2005-03-02 | 富士通株式会社 | 光学的情報記憶装置 |
JPH11176019A (ja) * | 1997-10-06 | 1999-07-02 | Fujitsu Ltd | 光学的情報記憶装置 |
US6286962B1 (en) | 1998-12-23 | 2001-09-11 | Thomas Hennes, Inc. | Beamsplitter optical projection system |
WO2003034143A2 (en) * | 2001-10-16 | 2003-04-24 | Koninklijke Philips Electronics N.V. | Optical scanning device |
JP2004342145A (ja) * | 2003-05-13 | 2004-12-02 | Funai Electric Co Ltd | 光ピックアップ移動体および光ディスク装置ならびに光ディスク装置の製造方法 |
KR100503007B1 (ko) * | 2003-06-24 | 2005-07-21 | 삼성전기주식회사 | 광픽업용 액추에이터의 부공진 측정 장치 |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2311326A2 (fr) * | 1974-01-15 | 1976-12-10 | Thomson Brandt | Dispositif de focalisation et lecteur optique comportant un tel dispositif |
US4079247A (en) * | 1975-05-16 | 1978-03-14 | Claude Bricot | Optical focussing device |
GB1532345A (en) * | 1976-06-25 | 1978-11-15 | Hitachi Ltd | Information play-back apparatus |
NL7708200A (nl) * | 1976-07-28 | 1978-01-31 | Hitachi Ltd | Automatische scherpstellingsinrichting. |
NL7907216A (nl) * | 1979-09-28 | 1981-03-31 | Philips Nv | Optisch fokusfout-detektiestelsel. |
JPS573235A (en) * | 1980-06-07 | 1982-01-08 | Ricoh Co Ltd | Focus controlling method |
JPS5897730U (ja) * | 1981-12-24 | 1983-07-02 | ヤマハ株式会社 | 光学式情報記録再生装置における自動焦点装置 |
JPS59119548A (ja) * | 1982-12-25 | 1984-07-10 | Pioneer Electronic Corp | 光学式ピツクアツプ装置 |
JPS59167863A (ja) * | 1983-03-14 | 1984-09-21 | Minolta Camera Co Ltd | 光デイスク用光学系 |
JPS6043229A (ja) * | 1983-08-17 | 1985-03-07 | Sankyo Seiki Mfg Co Ltd | 光学式記録情報再生装置のピツクアツプ |
JPS6055521A (ja) * | 1983-09-05 | 1985-03-30 | Mitsubishi Electric Corp | 光デイスクヘツドの自動焦点調節装置 |
JPS6095733A (ja) * | 1983-10-31 | 1985-05-29 | Hitachi Ltd | 光学的信号処理装置 |
JPS61202339A (ja) * | 1985-03-05 | 1986-09-08 | Konishiroku Photo Ind Co Ltd | 光ピツクアツプ |
JPS61236035A (ja) * | 1985-04-09 | 1986-10-21 | Sony Corp | 光学ヘツド |
-
1985
- 1985-07-08 JP JP60149833A patent/JPS629537A/ja active Granted
-
1986
- 1986-07-08 EP EP86305271A patent/EP0208538B1/de not_active Expired - Lifetime
- 1986-07-08 US US06/883,396 patent/US4731527A/en not_active Expired - Fee Related
- 1986-07-08 DE DE8686305271T patent/DE3679460D1/de not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
US4731527A (en) | 1988-03-15 |
JPS629537A (ja) | 1987-01-17 |
EP0208538A1 (de) | 1987-01-14 |
EP0208538B1 (de) | 1991-05-29 |
JPH0582658B2 (de) | 1993-11-19 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8328 | Change in the person/name/address of the agent |
Free format text: GRUENECKER, A., DIPL.-ING. KINKELDEY, H., DIPL.-ING. DR.-ING. STOCKMAIR, W., DIPL.-ING. DR.-ING. AE.E. CAL TECH SCHUMANN, K., DIPL.-PHYS. DR.RER.NAT. JAKOB, P., DIPL.-ING. BEZOLD, G., DIPL.-CHEM. DR.RER.NAT. MEISTER, W., DIPL.-ING. HILGERS, H., DIPL.-ING. MEYER-PLATH, H., DIPL.-ING. DR.-ING. EHNOLD, A., DIPL.-ING. SCHUSTER, T., DIPL.-PHYS. GOLDBACH, K., DIPL.-ING.DR.-ING. AUFENANGER, M., DIPL.-ING. KLITZSCH, G., DIPL.-ING., PAT.-ANWAELTE, 8000 MUENCHEN |
|
8364 | No opposition during term of opposition | ||
8320 | Willingness to grant licences declared (paragraph 23) | ||
8339 | Ceased/non-payment of the annual fee |