KR960015433A - Optical pickup - Google Patents
Optical pickup Download PDFInfo
- Publication number
- KR960015433A KR960015433A KR1019940025382A KR19940025382A KR960015433A KR 960015433 A KR960015433 A KR 960015433A KR 1019940025382 A KR1019940025382 A KR 1019940025382A KR 19940025382 A KR19940025382 A KR 19940025382A KR 960015433 A KR960015433 A KR 960015433A
- Authority
- KR
- South Korea
- Prior art keywords
- light
- disk
- objective lens
- photodetector
- 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
- 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
- G11B7/08—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
- G11B7/13—Optical detectors therefor
- G11B7/131—Arrangement of detectors in a multiple array
Landscapes
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
Abstract
트래킹 오차신호를 검출하기 위한 광검출기를 보강한 광픽업이 개시되어 있다.An optical pickup in which an optical detector for detecting a tracking error signal is reinforced is disclosed.
이 개시된 광픽업의 보강된 광검출기(50)는 광기록매체인 디스크(20) 상에 광을 수렴하는 대물렌즈(15) 주변의 상기 디스크와 마주보는 면에 설치되어 있어, 이 광검출기(50)는 상기 디스크(20)에서 회절반사된 광중에서 특히, 대물렌즈(l5)를 통과하지 않은 ±1차회절광을 검출한다. 이 검출된 광량을 차동하는 차동수단(62)을 마련하고. 이 수단을 통한 광량을 상기 디스크(20)에서 반사되어 상기 대물렌즈(15)를 통과한 회절광을 검출하는 광검출기(40)의 차동수단(61)을 통한 광량을 입력받아 적절히 보상된 새로운 트래킹 오차신호를 검출하는 신호 보상기(64)가 구비되어 있다.The enhanced photodetector 50 of the disclosed optical pickup is provided on the disk 20, which is an optical recording medium, on a surface facing the disk around the objective lens 15, which converges light, so that the photodetector 50 ) Detects, among the light diffracted by the disk 20, ± first order diffracted light that does not pass through the objective lens l5. And differential means 62 for differentialting the detected amount of light. New tracking, which is properly compensated by receiving the amount of light through the differential means 61 of the photodetector 40 reflecting the amount of light through this means reflected by the disk 20 and passing through the objective lens 15. A signal compensator 64 for detecting an error signal is provided.
따라, 대물렌즈의 광축 어긋남에 의하여 오정보를 포함한 트래킹 오차신호를 어느정도 보상할 수 있고, 디스크의 기울어짐을 보상할 수 있는 매우 유용한 발명이다.Accordingly, the tracking error signal including the misinformation can be compensated to some extent by the optical axis misalignment of the objective lens, and it is a very useful invention that can compensate the tilt of the disk.
Description
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.
제4도의 (가)도는 디스크에서 반사되어 대물렌즈를 투과한 회절반사광을 수광하는 제1광검출기를 도시한 단면도이고,4A is a cross-sectional view showing a first photodetector for receiving diffracted reflection light reflected from a disk and transmitted through an objective lens,
(나)도는 대물렌즈의 주변 상면에 설치되어 대물렌즈를 투과하지 않는 ±1차회절광을 수광하는 제2 광검출기를 도시한 개략도,(B) is a schematic diagram showing a second photodetector provided on the peripheral upper surface of the objective lens and receiving a ± first order diffracted light that does not pass through the objective lens;
제5도는 제4도에 도시한 두 광검출기를 통하여 검출된 신호를 처리하여 트래킹 오차신호를 출력하는 회로를 나타낸 회로도.FIG. 5 is a circuit diagram showing a circuit for processing a signal detected through the two photodetectors shown in FIG. 4 to output a tracking error signal. FIG.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019940025382A KR0132821B1 (en) | 1994-10-04 | 1994-10-04 | Optical pick-up |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019940025382A KR0132821B1 (en) | 1994-10-04 | 1994-10-04 | Optical pick-up |
Publications (2)
Publication Number | Publication Date |
---|---|
KR960015433A true KR960015433A (en) | 1996-05-22 |
KR0132821B1 KR0132821B1 (en) | 1998-04-18 |
Family
ID=19394414
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1019940025382A KR0132821B1 (en) | 1994-10-04 | 1994-10-04 | Optical pick-up |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR0132821B1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3998895B2 (en) * | 2000-08-04 | 2007-10-31 | パイオニア株式会社 | Optical pickup device and tilt amount detection method |
KR100486271B1 (en) * | 2002-10-08 | 2005-04-29 | 삼성전자주식회사 | Apparatus and method for generating tracking error signal |
-
1994
- 1994-10-04 KR KR1019940025382A patent/KR0132821B1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
KR0132821B1 (en) | 1998-04-18 |
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