KR20050057183A - 광학 헤드 - Google Patents
광학 헤드 Download PDFInfo
- Publication number
- KR20050057183A KR20050057183A KR1020057003770A KR20057003770A KR20050057183A KR 20050057183 A KR20050057183 A KR 20050057183A KR 1020057003770 A KR1020057003770 A KR 1020057003770A KR 20057003770 A KR20057003770 A KR 20057003770A KR 20050057183 A KR20050057183 A KR 20050057183A
- Authority
- KR
- South Korea
- Prior art keywords
- light
- objective lens
- recording medium
- light beam
- information recording
- 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
- G11B7/095—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 specially adapted for discs, e.g. for compensation of eccentricity or wobble
-
- 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
- G11B7/131—Arrangement of detectors in a multiple array
-
- 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
- G11B7/095—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 specially adapted for discs, e.g. for compensation of eccentricity or wobble
- G11B7/0956—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 specially adapted for discs, e.g. for compensation of eccentricity or wobble to compensate for tilt, skew, warp or inclination of the disc, i.e. maintain the optical axis at right angles to the disc
-
- 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
- G11B7/08—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
- G11B7/094—Methods and circuits for servo offset compensation
-
- 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
- G11B7/0943—Methods and circuits for performing mathematical operations on individual detector segment outputs
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
Abstract
Description
Claims (9)
- 반도체 레이저와,상기 반도체 레이저로부터의 광속을 정보 기록 매체 상에 집광하는 대물 렌즈와,상기 반도체 레이저와 상기 대물 렌즈 사이에 위치하고, 상기 정보 기록 매체로부터의 반사광의 반사 직진광과 상기 정보 기록 매체의 정보 트랙에 의한 ±1 차 회절광과의 대략 간섭 영역 중, 상기 정보 기록 매체와 상기 대물 렌즈의 상대 각도의 변화 및 상기 대물 렌즈의 상기 정보 기록 매체의 방사 방향으로의 시프트에 의해 광량이 변화하는 영역에서의 복수의 광속을 각각 회절하는 광속 분리 수단과,상기 정보 기록 매체에서 반사되고 상기 광속 분리 수단에서 분리된 광속을 수광하여 전기 신호로 변환하는 수광 소자와,상기 정보 기록 매체에 대한 상기 대물 렌즈의 방사 방향으로의 시프트량에 대응하는 방사 방향 위치 신호에 따라서, 상기 수광 소자에서 검출한 전기 신호의 값을 보정하고, 상기 정보 기록 매체와 상기 대물 렌즈와의 상대 각도 또는 미리 규정한 기준면에 대한 상기 정보 기록 매체의 틸트량을 검출하는 연산 회로를 구비한 것을 특징으로 하는 광학 헤드.
- 제 1 항에 있어서, 상기 광속 분리 수단은 상기 대략 간섭 영역의 광속의 일부를 각각 회절하는, 광학 헤드.
- 제 1 항에 있어서, 상기 복수의 광속은 상기 반사 직진광의 대략 중심을 통과하는 방사 방향의 축 및 탄젠셜 방향의 축을 경계로 분할한 상기 광속 분리 수단의 4개 영역의 광속인, 광학 헤드.
- 제 1 항에 있어서, 상기 대물 렌즈를 방사 방향 및 포커스 방향으로 구동하는 대물 렌즈 구동 장치를 더 구비하고 있고, 상기 방사 방향 위치 신호는 상기 대물 렌즈를 방사 방향으로 구동시키는 인가 전류에서 연산한 신호인, 광학 헤드.
- 제 1 항에 있어서, 상기 방사 방향 위치 신호는 상기 대략 간섭 영역 외의 광속으로서, 상기 반사 직진광의 대략 중심을 통과하는 탄젠셜 방향의 축을 경계로 분할한 상기 광속 분리 수단의 적어도 2개의 영역의 광량을 연산하여 생성한 신호인, 광학 헤드.
- 제 1 항에 있어서, 상기 광속 분리 수단은 수지 또는 글래스로 형성된 홀로그램 또는 회절 격자인, 광학 헤드.
- 제 1 항에 있어서, 상기 광속 분리 수단은 λ/4판과, 상기 λ/4판과 상기 반도체 레이저 사이에 위치하고, 미리 설정된 편광 성분의 광속에만 회절 효과가 있는 편광 홀로그램을 구비하며, 상기 수광 소자는 상기 편광 홀로그램에 의해 회절된 광속을 수광하는, 광학 헤드.
- 제 1 항에 있어서, 상기 광속 분리 수단은 상기 대물 렌즈와 일체로 구성되고, 또한 상기 대물 렌즈와 일체로 포커스 방향 및 방사 방향으로 이동하는, 광학 헤드.
- 제 1 항에 있어서, 상기 대물 렌즈와 상기 반도체 레이저 사이에 콜리메이트 렌즈를 더 구비하고, 상기 콜리메이트 렌즈와 상기 광속 분리 수단이 일체인, 광학 헤드.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JPJP-P-2002-00261589 | 2002-09-06 | ||
JP2002261589 | 2002-09-06 |
Publications (2)
Publication Number | Publication Date |
---|---|
KR20050057183A true KR20050057183A (ko) | 2005-06-16 |
KR100695738B1 KR100695738B1 (ko) | 2007-03-16 |
Family
ID=31973135
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1020057003770A KR100695738B1 (ko) | 2002-09-06 | 2003-09-05 | 광학 헤드 |
Country Status (5)
Country | Link |
---|---|
US (1) | US7317672B2 (ko) |
JP (1) | JP4308766B2 (ko) |
KR (1) | KR100695738B1 (ko) |
CN (1) | CN100383868C (ko) |
WO (1) | WO2004023464A1 (ko) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1860652B1 (en) * | 2005-03-17 | 2011-09-28 | Panasonic Corporation | Optical disc device |
JP2007179686A (ja) * | 2005-12-28 | 2007-07-12 | Toshiba Corp | 光ピックアップおよび光ディスク装置ならびにラジアルチルト検出方法 |
JP4972602B2 (ja) * | 2008-04-10 | 2012-07-11 | 株式会社日立製作所 | 光信号検出回路及びそれを用いた情報再生装置 |
TW201021039A (en) * | 2008-10-30 | 2010-06-01 | Sanyo Electric Co | Optical pickup device and optical disc device equipped with same |
JP6694355B2 (ja) * | 2016-09-01 | 2020-05-13 | 浜松ホトニクス株式会社 | 可動回折格子及びその製造方法、並びに外部共振器型レーザモジュール |
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JPS60127630A (ja) | 1983-12-14 | 1985-07-08 | 松下電工株式会社 | ヒユ−ズ |
GB2156069B (en) | 1984-02-03 | 1987-05-07 | Pioneer Electronic Corp | Apparatus for reproducing recorded information |
JPS61239440A (ja) * | 1985-04-16 | 1986-10-24 | Olympus Optical Co Ltd | 光学的情報記録再生装置 |
US5231621A (en) * | 1986-09-05 | 1993-07-27 | Canon Kabushiki Kaisha | Focus detector which serves to split off a portion of a detected light beam only when the detected light beam is not refocused at an expected refocus point |
DE68923833T2 (de) * | 1988-06-20 | 1996-06-13 | Mitsubishi Electric Corp | Optischer Kopf mit Kippkorrekturservomechanismus. |
US5234621A (en) * | 1989-03-09 | 1993-08-10 | Micro Vesicular Systems, Inc. | Rinse-free shampoo containing cross-linked carboxymethylcellulose |
DE4404635C2 (de) * | 1993-02-17 | 1998-06-18 | Hitachi Ltd | Schwimmender optischer Abtastkopf, der integral mit einer Lichtquelle und einem Photodetektor ausgebildet ist, und optisches Plattengerät mit einem solchen |
US5430699A (en) * | 1993-02-24 | 1995-07-04 | Matsushita Electric Industrial Co., Ltd. | Optical reading and writing device |
JP3161891B2 (ja) * | 1993-11-16 | 2001-04-25 | 松下電器産業株式会社 | ディスクチルト検出装置およびディスクチルト補正装置 |
JPH07311970A (ja) * | 1994-05-17 | 1995-11-28 | Seiko Epson Corp | 光ヘッド及び光記憶装置 |
US5511059A (en) * | 1994-06-14 | 1996-04-23 | Eastman Kodak Company | Multi-element grating beam splitter with a reflection grating element for use in front facet substraction |
US5544143A (en) * | 1994-06-14 | 1996-08-06 | Eastman Kodak Company | Read/write laser-detector-grating unit (LDGU) with an orthogonally-arranged focus and tracking sensor system |
JPH09138962A (ja) * | 1995-11-10 | 1997-05-27 | Ricoh Co Ltd | 光ディスク装置 |
JP3176544B2 (ja) * | 1995-12-13 | 2001-06-18 | 株式会社日立製作所 | 光ディスク装置 |
US5737296A (en) * | 1996-01-23 | 1998-04-07 | Matsushita Electric Industrial Co., Ltd. | Focus and tracking error detection by using plus and minus first order diffracted light |
US5689492A (en) * | 1996-08-06 | 1997-11-18 | Eastman Kodak Company | Assembly used for precisely positioning the component parts of a laser detector grating unit (LDGU) |
JP3211002B2 (ja) * | 1997-04-24 | 2001-09-25 | 富士通株式会社 | 光記録媒体、チルト検出器、光ディスク装置、チルト検出方法及びチルト補正方法 |
CN1130708C (zh) * | 1997-10-01 | 2003-12-10 | 松下电器产业株式会社 | 半导体激光装置 |
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TW440818B (en) * | 1999-06-05 | 2001-06-16 | Ind Tech Res Inst | Device and method for obtaining and calibrating compact disk's tilt error signals |
JP2001297459A (ja) * | 2000-04-14 | 2001-10-26 | Nec Corp | 光ヘッド装置および光学式情報記録再生装置 |
JP3456579B2 (ja) * | 2000-04-20 | 2003-10-14 | 日本電気株式会社 | 光ヘッド装置および光学式情報記録再生装置 |
JP3998895B2 (ja) * | 2000-08-04 | 2007-10-31 | パイオニア株式会社 | 光ピックアップ装置及びチルト量検出方法 |
JP3431595B2 (ja) | 2000-11-13 | 2003-07-28 | 松下電器産業株式会社 | ディスクチルト検出装置およびディスクチルト補正装置 |
US20020097660A1 (en) * | 2000-11-16 | 2002-07-25 | Matsushita Electric Industrial Co., Ltd. | Diffraction grating body, optical pick-up, semiconductor laser apparatus and optical information apparatus |
-
2003
- 2003-09-05 CN CNB038212595A patent/CN100383868C/zh not_active Expired - Fee Related
- 2003-09-05 WO PCT/JP2003/011334 patent/WO2004023464A1/ja active Application Filing
- 2003-09-05 US US10/526,646 patent/US7317672B2/en not_active Expired - Lifetime
- 2003-09-05 KR KR1020057003770A patent/KR100695738B1/ko active IP Right Grant
- 2003-09-05 JP JP2004534166A patent/JP4308766B2/ja not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
CN1682289A (zh) | 2005-10-12 |
WO2004023464A1 (ja) | 2004-03-18 |
US20060007838A1 (en) | 2006-01-12 |
US7317672B2 (en) | 2008-01-08 |
CN100383868C (zh) | 2008-04-23 |
JP4308766B2 (ja) | 2009-08-05 |
JPWO2004023464A1 (ja) | 2006-01-05 |
KR100695738B1 (ko) | 2007-03-16 |
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