KR19990049997A - 광조절 반사형 듀얼 포커스 광픽업장치 - Google Patents
광조절 반사형 듀얼 포커스 광픽업장치 Download PDFInfo
- Publication number
- KR19990049997A KR19990049997A KR1019970069019A KR19970069019A KR19990049997A KR 19990049997 A KR19990049997 A KR 19990049997A KR 1019970069019 A KR1019970069019 A KR 1019970069019A KR 19970069019 A KR19970069019 A KR 19970069019A KR 19990049997 A KR19990049997 A KR 19990049997A
- Authority
- KR
- South Korea
- Prior art keywords
- light
- laser light
- liquid crystal
- laser
- light control
- 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
- G11B7/12—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
- G11B7/139—Numerical aperture control means
-
- 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
-
- 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
- G11B7/13—Optical detectors therefor
-
- 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
-
- 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
- G11B7/1369—Active plates, e.g. liquid crystal panels or electrostrictive elements
-
- 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
- G11B7/1372—Lenses
- G11B7/1374—Objective lenses
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Optical Head (AREA)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019970069019A KR19990049997A (ko) | 1997-12-16 | 1997-12-16 | 광조절 반사형 듀얼 포커스 광픽업장치 |
FR9815826A FR2772506A1 (fr) | 1997-12-16 | 1998-12-15 | Systeme de lecture optique compact pour une utilisation avec des disques optiques d'epaisseurs differentes |
NL1010825A NL1010825A1 (nl) | 1997-12-16 | 1998-12-16 | Optisch opneemstelsel met compacte afmetingen voor gebruik met opische schijven van verschillende dikten. |
CN98125221A CN1220451A (zh) | 1997-12-16 | 1998-12-16 | 用于不同厚度的光盘的小尺寸光学拾取系统 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019970069019A KR19990049997A (ko) | 1997-12-16 | 1997-12-16 | 광조절 반사형 듀얼 포커스 광픽업장치 |
Publications (1)
Publication Number | Publication Date |
---|---|
KR19990049997A true KR19990049997A (ko) | 1999-07-05 |
Family
ID=19527394
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1019970069019A KR19990049997A (ko) | 1997-12-16 | 1997-12-16 | 광조절 반사형 듀얼 포커스 광픽업장치 |
Country Status (4)
Country | Link |
---|---|
KR (1) | KR19990049997A (nl) |
CN (1) | CN1220451A (nl) |
FR (1) | FR2772506A1 (nl) |
NL (1) | NL1010825A1 (nl) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5331622A (en) * | 1991-05-28 | 1994-07-19 | Applied Magnetics Corporation | Compact optical head |
US6026065A (en) * | 1995-03-04 | 2000-02-15 | Lg Electronics Inc. | Optical pick-up apparatus capable of reading data irrespective of disc type |
JP2725632B2 (ja) * | 1995-05-24 | 1998-03-11 | 日本電気株式会社 | 光ヘッド装置 |
JP3476989B2 (ja) * | 1995-08-04 | 2003-12-10 | パイオニア株式会社 | 光ピックアップ |
EP0762398B1 (en) * | 1995-08-31 | 2003-05-07 | SANYO ELECTRIC Co., Ltd. | Optical disk recording/reproducing apparatus recording/reproducing information to/from optical disks according to different standards |
US5659533A (en) * | 1996-07-23 | 1997-08-19 | Sampo Corporation | Method of using a single pick-up head to read and store data on discs of different thicknesses and structure of a pick-up head apparatus therefor |
-
1997
- 1997-12-16 KR KR1019970069019A patent/KR19990049997A/ko active IP Right Grant
-
1998
- 1998-12-15 FR FR9815826A patent/FR2772506A1/fr active Pending
- 1998-12-16 NL NL1010825A patent/NL1010825A1/nl not_active Application Discontinuation
- 1998-12-16 CN CN98125221A patent/CN1220451A/zh active Pending
Also Published As
Publication number | Publication date |
---|---|
FR2772506A1 (fr) | 1999-06-18 |
CN1220451A (zh) | 1999-06-23 |
NL1010825A1 (nl) | 1999-06-17 |
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