CA2001143A1 - Lecteur optique possedant des regions a diffractions multiples - Google Patents
Lecteur optique possedant des regions a diffractions multiplesInfo
- Publication number
- CA2001143A1 CA2001143A1 CA2001143A CA2001143A CA2001143A1 CA 2001143 A1 CA2001143 A1 CA 2001143A1 CA 2001143 A CA2001143 A CA 2001143A CA 2001143 A CA2001143 A CA 2001143A CA 2001143 A1 CA2001143 A1 CA 2001143A1
- Authority
- CA
- Canada
- Prior art keywords
- light receiving
- diffraction
- regions
- diffracted
- region
- 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.)
- Granted
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
- G11B7/0916—Foucault or knife-edge methods
-
- 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
- G11B7/1353—Diffractive elements, e.g. holograms or gratings
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Head (AREA)
- Optical Recording Or Reproduction (AREA)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63266425A JPH0677335B2 (ja) | 1988-10-21 | 1988-10-21 | 光ピックアップ装置 |
JP63-266425 | 1988-10-21 | ||
JP1095646A JPH073703B2 (ja) | 1989-04-13 | 1989-04-13 | 光ピックアップ装置 |
JP1-95646 | 1989-04-13 |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2001143A1 true CA2001143A1 (fr) | 1990-04-21 |
CA2001143C CA2001143C (fr) | 1994-08-23 |
Family
ID=26436872
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002001143A Expired - Lifetime CA2001143C (fr) | 1988-10-21 | 1989-10-20 | Lecteur optique possedant des regions a diffractions multiples |
Country Status (5)
Country | Link |
---|---|
US (2) | US5049732A (fr) |
EP (1) | EP0365368B1 (fr) |
KR (1) | KR920007317B1 (fr) |
CA (1) | CA2001143C (fr) |
DE (1) | DE68922272T2 (fr) |
Families Citing this family (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH083910B2 (ja) * | 1989-01-13 | 1996-01-17 | シャープ株式会社 | 光ピックアップ装置 |
US5180909A (en) * | 1990-04-27 | 1993-01-19 | Victor Company Of Japan, Ltd. | Optical pickup using diffracted light |
JP3028854B2 (ja) * | 1990-07-18 | 2000-04-04 | セイコーエプソン株式会社 | 光ヘッド及び光記憶再生装置 |
NL9002007A (nl) * | 1990-09-12 | 1992-04-01 | Philips Nv | Inrichting voor het met optische straling aftasten van een informatievlak. |
JPH04137232A (ja) * | 1990-09-27 | 1992-05-12 | Sharp Corp | 光ピックアップ装置 |
JP2776487B2 (ja) * | 1992-01-28 | 1998-07-16 | シャープ株式会社 | 光学式情報記録再生装置 |
JPH05307759A (ja) * | 1992-04-28 | 1993-11-19 | Olympus Optical Co Ltd | 光ピックアップ |
KR970008231B1 (en) * | 1992-06-03 | 1997-05-22 | Lg Electronics Inc | Optical pick-up apparatus |
US5412631A (en) * | 1992-07-10 | 1995-05-02 | Matsushita Electric Industrial Co., Ltd. | Optical head apparatus for storing, reading or erasing information, and optical information reproducing method and optical information apparatus for optically reading information stored in an optical memory |
US5360970A (en) * | 1992-12-29 | 1994-11-01 | Eastman Kodak Company | Apparatus and method for a single return path signal sensor system |
CN1064775C (zh) * | 1994-10-25 | 2001-04-18 | 株式会社三协精机制作所 | 光拾取装置 |
JPH10241188A (ja) * | 1997-02-24 | 1998-09-11 | Sanyo Electric Co Ltd | 光ピックアップ装置およびそれを備えた光学記録媒体駆動装置 |
US6411573B1 (en) | 1998-02-20 | 2002-06-25 | Zen Research (Ireland), Ltd. | Multi-beam optical pickup |
JP3521738B2 (ja) * | 1998-04-08 | 2004-04-19 | 日本ビクター株式会社 | 光ピックアップ装置、エラー検出装置及びその検出方法 |
EP0990927A3 (fr) * | 1998-09-28 | 2000-12-13 | Sharp Kabushiki Kaisha | Réseau de diffraction avec plusieurs réseaux de périodes différentes pour générer des rayons multiples et tête de lecture optique l'utilisant |
JP3545233B2 (ja) * | 1998-12-08 | 2004-07-21 | シャープ株式会社 | 球面収差検出装置および光ピックアップ装置 |
US6891791B1 (en) | 1999-08-19 | 2005-05-10 | Interscience, Inc. | Optical pickup apparatus and method |
US6909687B2 (en) * | 2000-03-29 | 2005-06-21 | Sanyo Electric Co., Ltd. | Optical pickup with a diffraction element consist of six regions providing spatial variation corresponding to a focas state |
US6952510B1 (en) * | 2001-08-31 | 2005-10-04 | Nlight Photonics Corporation | Optically corrected intracavity fiber coupled multigain element laser |
JP2004103134A (ja) * | 2002-09-10 | 2004-04-02 | Matsushita Electric Ind Co Ltd | 光ピックアップ装置 |
JP4177296B2 (ja) * | 2004-06-22 | 2008-11-05 | シャープ株式会社 | 光ピックアップおよび光ディスク装置 |
JP4083720B2 (ja) * | 2004-09-17 | 2008-04-30 | シャープ株式会社 | 光ピックアップ装置 |
JP4722812B2 (ja) * | 2006-10-24 | 2011-07-13 | シャープ株式会社 | 光ピックアップ装置、及び当該光ピックアップ装置を備える光情報記録再生装置 |
JP5211697B2 (ja) * | 2008-01-07 | 2013-06-12 | セイコーエプソン株式会社 | 照明装置、画像表示装置及びプロジェクタ |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE522849C (de) * | 1931-04-15 | Josef Elbert | Verfahren zum Reinigen von Bierleitungen | |
FR2313716A1 (fr) * | 1975-06-03 | 1976-12-31 | Thomson Brandt | Systeme optique de lecture par reflexion d'un support d'information |
US4733065A (en) * | 1984-06-27 | 1988-03-22 | Canon Kabushiki Kaisha | Optical head device with diffraction grating for separating a light beam incident on an optical recording medium from a light beam reflected therefrom |
JPS61177645A (ja) * | 1985-01-31 | 1986-08-09 | Fujitsu Ltd | 焦点誤差制御装置 |
NL8502835A (nl) * | 1985-10-17 | 1987-05-18 | Philips Nv | Inrichting voor het met optische straling aftasten van een informatievlak. |
DE3679648D1 (de) * | 1985-12-10 | 1991-07-11 | Nec Corp | Optischer kopf mit einem beugungsgitter zum richten von zwei oder mehreren gebeugten lichtstrahlen auf optische detektoren. |
US4817074A (en) * | 1985-12-19 | 1989-03-28 | Nec Corporation | Method and apparatus for detecting the focusing state and positioning accuracy of a light beam directed onto an optical disk tracking guide in an optical recording system |
US4731772A (en) * | 1986-05-06 | 1988-03-15 | Lee Wai Hon | Optical head using hologram lens for both beam splitting and focus error detection functions |
US4794585A (en) * | 1986-05-06 | 1988-12-27 | Lee Wai Hon | Optical head having a hologram lens and polarizers for use with magneto-optic medium |
KR900008380B1 (ko) * | 1986-07-01 | 1990-11-17 | 미쓰비시덴기 가부시기 가이샤 | 광학식 헤드장치 |
JPH0827965B2 (ja) * | 1986-08-29 | 1996-03-21 | 株式会社日立製作所 | 光学式再生装置 |
EP0273356B1 (fr) * | 1986-12-25 | 1992-04-29 | Nec Corporation | Tête optique |
NL8701749A (nl) * | 1987-07-24 | 1989-02-16 | Philips Nv | Inrichting voor het met optische straling aftasten van een informatievlak. |
JPH01151022A (ja) * | 1987-12-09 | 1989-06-13 | Sharp Corp | 光ピックアップ装置 |
-
1989
- 1989-10-19 US US07/424,373 patent/US5049732A/en not_active Ceased
- 1989-10-20 CA CA002001143A patent/CA2001143C/fr not_active Expired - Lifetime
- 1989-10-21 KR KR1019890015153A patent/KR920007317B1/ko not_active IP Right Cessation
- 1989-10-23 EP EP89310890A patent/EP0365368B1/fr not_active Expired - Lifetime
- 1989-10-23 DE DE68922272T patent/DE68922272T2/de not_active Expired - Lifetime
-
1993
- 1993-09-17 US US08/123,459 patent/USRE35332E/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0365368A3 (en) | 1990-11-07 |
KR920007317B1 (ko) | 1992-08-29 |
DE68922272D1 (de) | 1995-05-24 |
USRE35332E (en) | 1996-09-24 |
CA2001143C (fr) | 1994-08-23 |
EP0365368A2 (fr) | 1990-04-25 |
KR900006921A (ko) | 1990-05-09 |
EP0365368B1 (fr) | 1995-04-19 |
DE68922272T2 (de) | 1995-09-28 |
US5049732A (en) | 1991-09-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKEX | Expiry |