KR960015433A - Optical pickup - Google Patents

Optical pickup Download PDF

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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
Application number
KR1019940025382A
Other languages
Korean (ko)
Other versions
KR0132821B1 (en
Inventor
박병호
Original Assignee
김광호
삼성전자 주식회사
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 김광호, 삼성전자 주식회사 filed Critical 김광호
Priority to KR1019940025382A priority Critical patent/KR0132821B1/en
Publication of KR960015433A publication Critical patent/KR960015433A/en
Application granted granted Critical
Publication of KR0132821B1 publication Critical patent/KR0132821B1/en

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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)
  • Optics & Photonics (AREA)
  • Mathematical Physics (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

광픽업Optical pickup

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)

광원과, 광 집속수단으로 상기 광원과 정보 기록 재생 매체인 디스크의 광경로상에 위치된 대물렌즈와, 상기 디스크에서 반사된 광이 상기 광원으로 재입사되는 것을 방지하기 위하여 상기 광원과 대물렌즈 사이에 마련된 광 경로변환 수단과, 상기 디스크에서 반사된 광을 수광하여 트랭킹 오차신호와 포커싱 오차신호를 검출하는 광검출기가 구비된 광픽업에 있어서, 상기 광검출기는 상기 디스크에서 반사되어 상기 광 경로변환 수단을 통과한 광을 검출하는 적어도 이분할된 분할판을 가지는 제1광검출기와, 상기 대물렌즈와 동시에 운동하도록 그 주변에 설치되고 적어도 이분할된 분할판을 가지는 제2광검출기를 구비하여 된 것을 특징으로 하는 광픽업.A light source, an objective lens positioned on an optical path of a disk which is an information recording / reproducing medium by a light converging means, and between the light source and the objective lens to prevent the light reflected from the disk from being re-entered into the light source; And an optical detector for receiving a light path reflected by the disk and an optical detector for detecting a tracking error signal and a focusing error signal, wherein the optical detector is reflected from the disk to reflect the optical path. A first photodetector having at least a dividing split plate for detecting light passing through the converting means, and a second photodetector having a split plate at least partially divided to move simultaneously with the objective lens, Optical pickup characterized in that it became. 제1항에 있어서, 상기 제2광검출기는 두 분할판을 구비하고, 각각의 분할판은 상기 디스크에서 회전 반사되어 대물렌즈를 통과하지 않는 ±1차회절광을 각각 수광하도록 된 것을 특징으로 하는 광픽업.The method of claim 1, wherein the second photodetector is provided with two split plates, each split plate is adapted to receive ± first order diffracted light that is not reflected through the objective lens rotationally reflected from the disk, respectively. Optical pickup. 제2항에 있어서, 상기 두 분할판은 동일 형상으로 상기 대물렌즈 주변에 대칭적으로 배열된 것을 특징으로 하는 광픽업.The optical pickup of claim 2, wherein the two partition plates are symmetrically arranged around the objective lens in the same shape. 제1항에 있어서, 상기 제l광검출기의 각 분할판에 수광된 광량을 차동하는 제1차동수단과, 상기 제2광검출기의 각 분할판에 수광된 광량을 차동하는 제2차동수단이 마련되고, 이 두 차동수단에서 입력되는 신호로 새로운 트래킹 오차신호를 출력하는 신호보상기가 구비된 것을 특징으로 하는 광픽업.2. The apparatus of claim 1, further comprising: first differential means for differentialting the amount of light received on each of the divider plates of the first photodetector, and second differential means for differentialting the amount of light received on each of the divider plates of the second photodetector. And a signal compensator for outputting a new tracking error signal as a signal input from the two differential means. 제4항에 있어서, 상기 제2차동수단의 출력단과 상기 신호보상기의 입력단 사이에 상기 제2차동수단에서 출력되는 신호의 고주파 성분을 제거하기 의한 저역통과 필터를 구비한 것을 특징으로 하는 광픽업.The optical pickup of claim 4, further comprising a low pass filter for removing high frequency components of the signal output from the second differential means between the output terminal of the second differential means and the input terminal of the signal compensator. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019940025382A 1994-10-04 1994-10-04 Optical pick-up KR0132821B1 (en)

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

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Application Number Title Priority Date Filing Date
KR1019940025382A KR0132821B1 (en) 1994-10-04 1994-10-04 Optical pick-up

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
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

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KR0132821B1 (en) 1998-04-18

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