KR960002212A - 포커스에러 검출장치 - Google Patents
포커스에러 검출장치 Download PDFInfo
- Publication number
- KR960002212A KR960002212A KR1019940015695A KR19940015695A KR960002212A KR 960002212 A KR960002212 A KR 960002212A KR 1019940015695 A KR1019940015695 A KR 1019940015695A KR 19940015695 A KR19940015695 A KR 19940015695A KR 960002212 A KR960002212 A KR 960002212A
- Authority
- KR
- South Korea
- Prior art keywords
- focus error
- reflected light
- error detection
- light
- reflected
- 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
- G11B7/0908—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
-
- 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
- G11B7/08—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
-
- 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)
- Mathematical Physics (AREA)
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
Abstract
광픽업에 있어서, 광디스크에 대한 대물렌즈의 포커스에러를 검출하기 위한 포커스에러 검출장치가 개시되어 있다. 그 장치는 광디스크(5)의 반사광(6)의 광축이 쉬프트 또는 틸트되는 것에 의한 오류를 제거하고 소형화를 위한 것으로서, 그 반사광을 집속하는 집속렌즈(7), 집속되는 반사광을 회절시켜 분할하는 회절광학소자(14), 분할 회절된 1차 회절광(6c,6d)을 각각 수광하는 2개의 2분할 광검출기(15,16), 그리고 그 광검출기의 검출신호로부터 원하는 포커스에러 신호를 연산하는 회로요소를 포함한다. 개시된 장치는 광픽업을 안정하게 동작시키고, 또한 소형화하는데 유용하다.
Description
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제3도는 본 발명의 실시예에 따른 포커스에러 검출장치가 구비된 광픽업의 광학적 배치도.
Claims (6)
- 평행한 입사광을 광디스크에 집속하는 대물렌즈의 포커스에러를 검출하기 위한 포커스에러 검출장치에 있어서, 상기 광디스크에서 반사되는 반사광을 집속하는 집속렌즈와, 상기 집속렌즈에 의해여 집속되는 반사광을 투과시키는 동시에 그 반사광의 광축을 중심으로 좌우로 대칭하게 진행하는 적어도 2개의 광으로 분할하는 빔분할부재와, 상기 빔분할부재에 의하여 분할되는 상기 적어도 2개의 광을 수광하여 그 수광되는 광량에 따른 신호를 검출하는 적어도 2개의 2분할 광검출기와, 상기 적어도 2개의 2분할 광검출기의 검출된 신호로부터 상기 포커스에러의 정도를 알리는 포커스에러 신호를 연산하기 위한 회로수단을 구비하여 되는 것을 특징으로 하는 포커스에러 검출장치.
- 제1항에 있어서, 상기 빔분할부재가 상기 반사광을 회절시키는 것에 의하여 상기 적어도 2개의 반사광을 분할하는 회절광학소자로 구비되고, 상기 적어도 2개의 2분할 광검출기가 그 회절광학소자에 의하여 회절하는 회절광 중에서 ±1회절광을 수광하도록 구성된 것을 특징으로 하는 포커스에러 검출장치.
- 제1항에 있어서, 상기 빔분할부재가 상기 반사광을 복굴절시키는 것에 의하여 상기 적어도 2개의 반사광을 분할하는 복굴절소자로 구비되는 것을 특징으로 하는 포커스에러 검출장치.
- 제1항에 있어서, 상기 적어도 2개의 2분할 광검출기가 상기 분할된 적어도 2개의 반사광이 접속되는 초점의 부근에 위치하도록 배치되는 것을 특징으로 하는 포커스에러 검출장치.
- 제1항에 있어서, 상기 적어도 2개의 2분할 광검출기가 상기 분할된 적어도 2개의 반사광이 집속되는 초점보다 가까운 지점에 위치하도록 배치되는 것을 특징으로 하는 포커스에러 검출장치.
- 제1항에 있어서, 상기 적어도 2개의 2분할 광검출기가 상기 분할된 적어도 2개의 반사광이 집속되는 초점보다 먼 지점에서 위치하도록 배치되는 것을 특징으로 하는 포커스에러 검출장치.※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019940015695A KR100230235B1 (ko) | 1994-06-30 | 1994-06-30 | 포커스에러 검출장치 |
US08/366,255 US5594714A (en) | 1994-06-30 | 1994-12-29 | Focus error detection with two symmetrically splitted reflected beams |
JP7031651A JPH0817060A (ja) | 1994-06-30 | 1995-01-27 | フォーカスエラー検出装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019940015695A KR100230235B1 (ko) | 1994-06-30 | 1994-06-30 | 포커스에러 검출장치 |
Publications (2)
Publication Number | Publication Date |
---|---|
KR960002212A true KR960002212A (ko) | 1996-01-26 |
KR100230235B1 KR100230235B1 (ko) | 1999-11-15 |
Family
ID=19387064
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1019940015695A KR100230235B1 (ko) | 1994-06-30 | 1994-06-30 | 포커스에러 검출장치 |
Country Status (3)
Country | Link |
---|---|
US (1) | US5594714A (ko) |
JP (1) | JPH0817060A (ko) |
KR (1) | KR100230235B1 (ko) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999016061A1 (en) * | 1997-09-22 | 1999-04-01 | Seagate Technology, Inc. | Apparatus and method for differential wax-wane focusing and push-pull tracking for magneto-optical data storage |
US6407966B1 (en) * | 1997-09-22 | 2002-06-18 | Seagate Technology Llp | Apparatus and method for differential wax-wane focusing and push-pull tracking for magneto-optical data storage |
KR20040024122A (ko) * | 2002-09-13 | 2004-03-20 | 삼성전자주식회사 | 액츄에이터 및 이를 채용한 광픽업 |
TWI303807B (en) * | 2004-09-22 | 2008-12-01 | Lite On It Corp | An optical disk drive for compensating wobble signal and method thereof |
TWI299493B (en) * | 2004-09-23 | 2008-08-01 | Lite On It Corp | An optical disk drive for compensating wobble signal and method thereof |
US20070239256A1 (en) * | 2006-03-22 | 2007-10-11 | Jan Weber | Medical devices having electrical circuits with multilayer regions |
KR20190037735A (ko) | 2017-09-29 | 2019-04-08 | 나라산업 주식회사 | 예초기용 멜빵 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6297144A (ja) * | 1985-10-24 | 1987-05-06 | Mitsubishi Electric Corp | 光ピツクアツプ |
DE3786541T2 (de) * | 1986-12-25 | 1993-11-25 | Nippon Electric Co | Verfahren und Gerät zur Erfassung von Ausrichtungs- und Fokusfehlern in einem optischen Kopf. |
US4973836A (en) * | 1987-03-31 | 1990-11-27 | Canon Kabushiki Kaisha | Optical pickup device including a beam splitter having an inclined plane |
US4970710A (en) * | 1987-07-29 | 1990-11-13 | Laser Magnetic Storage International Company | Method and apparatus for focus and tracking in an optical disk system |
JPH0748262B2 (ja) * | 1988-09-30 | 1995-05-24 | 松下電器産業株式会社 | 焦点誤差検出装置 |
US5161139A (en) * | 1989-01-06 | 1992-11-03 | Kabushiki Kaisha Toshiba | Focusing error detecting apparatus |
JP2768985B2 (ja) * | 1989-04-20 | 1998-06-25 | オリンパス光学工業株式会社 | 光学式情報記録再生装置 |
US5465247A (en) * | 1992-05-14 | 1995-11-07 | Olympus Optical Co., Ltd. | Optical head |
-
1994
- 1994-06-30 KR KR1019940015695A patent/KR100230235B1/ko not_active IP Right Cessation
- 1994-12-29 US US08/366,255 patent/US5594714A/en not_active Expired - Lifetime
-
1995
- 1995-01-27 JP JP7031651A patent/JPH0817060A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
JPH0817060A (ja) | 1996-01-19 |
KR100230235B1 (ko) | 1999-11-15 |
US5594714A (en) | 1997-01-14 |
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