KR100215455B1 - 포커스에러를 검출하는 dvd/cd겸용 광픽업시스템 - Google Patents
포커스에러를 검출하는 dvd/cd겸용 광픽업시스템 Download PDFInfo
- Publication number
- KR100215455B1 KR100215455B1 KR1019960027677A KR19960027677A KR100215455B1 KR 100215455 B1 KR100215455 B1 KR 100215455B1 KR 1019960027677 A KR1019960027677 A KR 1019960027677A KR 19960027677 A KR19960027677 A KR 19960027677A KR 100215455 B1 KR100215455 B1 KR 100215455B1
- Authority
- KR
- South Korea
- Prior art keywords
- spherical aberration
- optical pickup
- pickup system
- dvd
- detecting
- 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
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Classifications
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- 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
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/127—Lasers; Multiple laser arrays
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- 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
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- 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
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- 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
- G11B7/1376—Collimator lenses
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- 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
- G11B7/1378—Separate aberration correction lenses; Cylindrical lenses to generate astigmatism; Beam expanders
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- 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
- G11B7/1392—Means for controlling the beam wavefront, e.g. for correction of aberration
- G11B7/13925—Means for controlling the beam wavefront, e.g. for correction of aberration active, e.g. controlled by electrical or mechanical means
- G11B7/13927—Means for controlling the beam wavefront, e.g. for correction of aberration active, e.g. controlled by electrical or mechanical means during transducing, e.g. to correct for variation of the spherical aberration due to disc tilt or irregularities in the cover layer thickness
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Head (AREA)
Abstract
Description
Claims (5)
- 디스크상에 기록된 신호를 검출하기 위한 광픽업장치에 있어서, 상기 기록된 신호의 검출에 이용되는 빔을 방사하는 레이져다이오드; 상기 레이져다이오드로부터 방사된 빔을 투과하고, 상기 디스크상으로부터 반사된 빔을 반사하는 빔스플리터; 상기 빔스플리터를 투과한 빔을 상기 디스크상에 집속하고, 상기 디스크로부터 반사된 빔을 상기 빔스플리터로 입사시키는 대물렌즈; 상기 빔스플리터에서 반사된 빔을 그 빔에 포함된 구면수차성분을 보정하며 투과시키는 구면수차보정판; 상기 구면수차보정판을 투과한 빔을 그 빔의 비점수차성분을 조절하며 투과시키는 비점수차렌즈; 및 상기 비점수차렌즈를 투과한 빔으로부터 포커스에러신호를 검출하는 광검출기로 포함하는, 포커스에러를 검출하는 DVD/CD겸용 광픽업시스템.
- 제 1 항에 있어서, 상기 구면수차보정판은 그 두께가 상기 구면수차성분의 보정에 적합하도록 조절되어 제작되는 것을 특징으로 하는, 포커스에러를 검출하는 DVD/CD겸용 광픽업시스템.
- 제 2 항에 있어서, 상기 구면수차보정판은 상기 비점수차성분을 조절하는 비점수차렌즈의 특성을 고려하여 상기 구면수차보정판의 두께를 조절하는 것을 특징으로 하는, 포커스에러를 검출하는 DVD/CD겸용 광픽업시스템.
- 제 1 항에 있어서, 상기 광픽업시스템은 상기 레이져다이오드와 상기 빔스플리터사이에, 상기 레이져다이오드에서 방사되는 빔을 일정하게 분산시키는 회절격자를 더 포함하는, 포커스에러를 검출하는 DVD/CD겸용 광픽업시스템.
- 제 1 항에 있어서, 상기 광픽업시스템은 상기 빔스플리터와 상기 대물렌즈사이에, 상기 빔스플리터로부터 발산되어 출사된 빔을 평행하게 변환시키는 콜리메이팅렌즈(collimating lense)를 더 포함하는, 포커스에러를 검출하는 DVD/CD겸용 광픽업시스템.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019960027677A KR100215455B1 (ko) | 1996-07-09 | 1996-07-09 | 포커스에러를 검출하는 dvd/cd겸용 광픽업시스템 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019960027677A KR100215455B1 (ko) | 1996-07-09 | 1996-07-09 | 포커스에러를 검출하는 dvd/cd겸용 광픽업시스템 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR980011373A KR980011373A (ko) | 1998-04-30 |
| KR100215455B1 true KR100215455B1 (ko) | 1999-08-16 |
Family
ID=19465809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019960027677A Expired - Fee Related KR100215455B1 (ko) | 1996-07-09 | 1996-07-09 | 포커스에러를 검출하는 dvd/cd겸용 광픽업시스템 |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR100215455B1 (ko) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4512515B2 (ja) * | 2005-04-26 | 2010-07-28 | 株式会社日立製作所 | 光ディスク装置及び光ディスク判別方法 |
-
1996
- 1996-07-09 KR KR1019960027677A patent/KR100215455B1/ko not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| KR980011373A (ko) | 1998-04-30 |
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