KR970071547A - 트랙킹 제어 장치 및 방법 - Google Patents

트랙킹 제어 장치 및 방법 Download PDF

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KR970071547A
KR970071547A KR1019970011624A KR19970011624A KR970071547A KR 970071547 A KR970071547 A KR 970071547A KR 1019970011624 A KR1019970011624 A KR 1019970011624A KR 19970011624 A KR19970011624 A KR 19970011624A KR 970071547 A KR970071547 A KR 970071547A
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output
detector
error signal
signal
function generator
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KR1019970011624A
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KR100306541B1 (ko
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루드윅 체콥스키
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데니스 피셸
디스커비젼 어소우쉬에이트
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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
    • G11B7/13—Optical detectors therefor
    • G11B7/133—Shape of individual detector elements
    • 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
    • G11B7/0901—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 track following 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
    • G11B7/0901—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 track following only
    • G11B7/0903—Multi-beam tracking systems
    • 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
    • G11B7/0946—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 operation during external perturbations not related to the carrier or servo beam, e.g. vibration
    • 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
    • G11B7/0948—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 detection and avoidance or compensation of imperfections on the carrier, e.g. dust, scratches, dropouts
    • 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
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head

Abstract

복사 에너지의 빔을 제어하기 위한 장치가 제공된다. 빔의 검출기는 빔의 위치에 응답하는 제1 및 제2출력을 가진다. 회로는 선정된 위치로부터의 빔의 변위를 나타내는 에어 신호를 생성하기 위해 검출기의 출력에 결합된다. 여기서, 에러 신호는 변위에 관련하여 주기적인 특성을 가진다. 에러 신호에 응답하는 서보는 변위된 빔을 선정한 위치로 복귀시킨다. 국부 피드 백 루프는 검출기의 출력에 결합되고, 각각이 에러 신호에 응답하는 제1 및 제2 주기 함수 발생기를 포함한다.
제2주기 함수 발생기는 제1주기 함수 발생기의 출력과 위상각, 양호하게는 90 만큼, 다른 출력을 가진다. 제1곱셈기는 검출기의 제1출력에 제1주기 함수 발생기의 출력을 곱한다. 제2곱셈기는 검출기의 제2출력에 제2주기 함수 발생기의 출력을 곱한다. 여기서, 제1 및 제2곱셈기의 출력은 에로 신호를 수정하기 위한 회로의 입력으로서 제공된다.

Description

트랙킹 제어 장치 및 방법
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제1도는 본 발명에 따른 장치의 개략도, 제3도는 제1도의 장치 내의 신호 회복 서브시스템의 블럭도.

Claims (14)

  1. 복사 에너지 빔(a beam of radiant energy)을 사용하여 목적물(object)을 검출하기 위한 장치에 있어서, 복사 에너지 빔을 목적물로 보내는 소스(source); 상기 목적물에 관련한 상기 빔의 위치에 응답하는 제1 및 제2출력을 갖는 상기 빔의 검출기(detector); 선정된 위치로부터의 상기 빔의 변위를 나타내며, 상기 변위에 관련하여 주기적 특성를 갖는 에러 신호를 생성하기 위한 상기 검출기의 상기 출력에 결합된 회로(circuit); 상기 에러 신호에 응답하는 제1주기 함수 발생기, 및 상기 에러 신호에 응답하며 상기 제1주기 함수 발생기의 출력과는 일정한 위상각(phase angle)만큼 다른 출력을 갖는 제2주기 함수 발생기를 포함하는 상기 검출기의 상기 출력에 결합된 국부 피드백 루프(local feedback loop); 상기 검출기의 상기 제1출력에 상기 제1주기 함수 발생기의 상기 출력을 곱하기 위한 제1곱셈기; 및 상기 검출기의 상기 제2출력에 상기 제2주기 함수 발생기의 상기 출력을 곱하기 위한 제2곱셈기를 포함하며, 상기 제1및 제2곱셈기의 상기 출력은 상기 회로의 입력으로서 제공되는 것을 특징으로 하는 복사 에너지 빔을 사용하여 목적물을 검출하기 위한 장치.
  2. 제1항에 있어서, 상기 주기적 특성은 실질적으로 SINE함수이며, 상기 제1주기 함수 발생기와 상기 제2주기 함수 발생기는 SINE발생기인 것을 특징으로 하는 복사 에너지 빔을 사용하여 목적물을 검출하기 위한 장치.
  3. 제1항에 있어서, 상기 검출기의 상기 제1 및 제2출력은 상기 빔의 상기 변위에 관해 대략적으로 상호직교(quadrature)하는 관계를 가지며, 상기 위상각은 대략 90°인 것을 특징으로 하는 복사 에너지 빔을 사용하여 목적물을 검출하기 위한 장치.
  4. 제1항에 있어서, 상기 제1 및 제2검출 신호는 상기 빔의 상기 변위에 관해 대략적으로 상호 직교하는 관계를 가지는 것을 특징으로 하는 복사 에너지 빔을 사용하여 목적물을 검출하기 위한 장치.
  5. 제1항에 있어서, 상기 검출기는 인터페로미터(interfermeter)를 포함하는 것을 특징으로 하는 복사 에너지 빔을 사용하여 목적물을 검출하기 위한 장치.
  6. 복사 에너지 빔을 제어하기 위한 장치에 있어서, 상기 빔의 위치에 응답하는 제1 및 제2출력을 갖는 상기 빔의 검출기; 상기 검출기의 상기 출력에 결합되어, 선정된 위치로부터의 상기 빔의 변위를 나타내며 상기 변위에 관련하여 주기적 특성을 갖는 에러 신호를 생성하기 위한 회로; 상기 에러 신호에 응답하여 상기 변위된 빔을 상기 선정된 위치로 복귀시키기 위한 서보(servo); 상기 에러 신호에 응답하는 제1주기 함수 발생기, 및 상기 에러 신호에 응답하여 상기 제1주기 함수 발생기의 출력과는 일정한 위상각 만큼 다른 출력을 갖는 제2주기 함수 발생기를 포함하는 상기 검출기의 상기 출력에 결합된 국부 피드백 루프; 상기 검출기의 상기제1출력에 상기 제1주기 함수 발생기의 상기 출력을 곱하기 위한 1곱셈기; 및 상기 검출기의 상기 제2출력에상기 제2주기 함수 발생기의 상기 출력을 곱하기 위한 제2곱셈기를 포함하며, 상기 제1 및 제2곱셈기의 상기 출력은 상기 회로의 입력으로서 제공되는 것을 특징으로 하는 복사에너지 빔을 제어하기 위한 장치.
  7. 제6항에 있어서, 상기 검출기는 인터페로미터를 포함하는 것을 특징으로 하는 복사 에너지 빔을 제어하기 위한 장치.
  8. 복사 에너지 빔을 제어하기 위한 방법에 있어서, 상기 빔의 위치에 응답하는 제1 및 제2검출 신호를 발생시키는 단계; 선정된 위치로부터 상기 빔의 변위를 나타내며, 상기 변위에 관련하여 주기적 특성을 갖는 에러 신호를 생성하기 위한 단계; 상기 에러 신호에 응답하여 상기 변위된 빔을 상기 선정된 위치로 복귀시키는 단계; 상기 에러 신호에 응답하여 제1주기적 신호를 발생시키는 단계; 및 상기 에러 신호에 응답하여 상기 제1주기 신호와는 일정한 위상각 만큼 다른 제2주기 신호를 발생시키는 단계를 포함하고, 에러 신호를 생성하기 위한 상기 단계는 상기 제1검출 신호에 상기 제1주기적 신호를 곱하여 제1결과 신호를 생성하는 단계; 상기 2검출 신호에 상기 제2주기적 신호를 곱하여 제2결과 신호를 생성하는 단계; 및 상기 제1결과 신호와 상기 제2결과 신호간의 차이를 판별하는 단계에 의해 수행되는 것을 특징으로 하는 복사 에너지 빔을 제어하기 위한 방법.
  9. 제8항에 있어서, 상기 제1 및 제2검출 신호와 상기 제1 및 제2주기적 신호는 실질적으로 SINE 함수인것을 특징으로 하는 복사 에너지 빔을 제어하기 위한 장치.
  10. 광학 디스크 시스템을 위한 트랙킹 제어 장치(trackinhg control apparatus)에 있어서, 복사 에너지 빔을 광학 디스크 상의 다수의 정보 트랙 중 선택된 하나로 보내는 소스; 상기 빔과 상기 디스크간의 회전축 주위의 상재적 회전 운동을 알려주기 위한 수단; 상기 선택된 정보 트랙을 따르도록 상기 디스크에 관련하여 일반적으로 방사형 방향으로 빔을 변위시키기 위한 빔 조종 수단(beam steering means); 상기 선택된 정보 트랙으로부터 되돌아오는 복사 에너지에 응답하며, 제1출력 신호와 상기 선택된 트랙으로부터 상기 빔의 변위에 따라 상기 제1출력 신호와 위상이 다른 제2출력 신호를 갖는 검출기; 상기 검출기의 상기 제1출력 신호에 전기적으로 결합된 제1입력을 갖는 제1곱셈기; 상기 검출기의 상기 제2출력 신호에 전기적으로 결합된 제1입력을 갖는 제2곱셈기; 에러 신호를 발생시키기 위해 상기 제1곱셈기의 출력에 결합된 제1입력과 상기 제2곱셈기의 출력에 결합된 제2입력을 갖는 차분 합산 증폭기(differential summing amplifier); 상기 차분 합산 증폭기의 출력에 결합된 입력과 상기 제1곱셈기의 제2입력에 결합된 출력을 갖는 제1주기 함수 발생기; 상기 차분 합산 증폭기의 출력에 결합된 입력과 상기 제2곱셈기의 제2입력에 결합된 출력을 갖는 제2주기 함수 발생기; 및 상기 빔 조종 수단을 동작시키기 위해 상기 차분 합산 증폭기의 상기 출력에 응답하는 서보를 포함하는 것을 특징으로 하는 광학 디스크 시스템을 위한 트랙킹 제어 장치.
  11. 제10항에 있어서, 증폭된 에러 신호를 발생시키는 상기 합산 증폭기의 상기 출력에 결합된 루프 이득증폭기, 및 상기 증폭된 에러 신호에 대해 위상 이득 보상을 제공하는 상기 루프 이득 증폭기에 결합된 피드백루프 보상 회로를 더 포함하는 것을 특징으로 하는 광학 디스크 시스템을 위한 트랙킹 제어 장치.
  12. 제11항에 있어서, 상기 루프 보상 회로에 결합되며 상기 제1주기 함수 발생기와 상기 제2주기 함수 발생기 중 하나에 결합되어 상기 에러 신호에 선정된 전압 옵셋을 제공하는 위상 이동기를 더 포함하는 것을 특징으로 하는 광학 디스크 시스템을 위한 트랙킹 제어 장치.
  13. 제12항에 있어서, 상기 제1주기 함수 발생기와 상기 제2주기 함수 발생기는 SINE 함수 발생기인 것을 특징으로 하는 광학 디스크 시스템을 위한 트랙킹 제어 장치.
  14. 제10항에 있어서, 상기 검출기는 인터페로미터를 포함하는 것을 특징으로 하는 광학 디스크 시스템을 위한 트랙킹 제어 장치.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019970011624A 1996-04-01 1997-03-31 트랙킹제어장치및방법 KR100306541B1 (ko)

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ES2118687T1 (es) 1998-10-01
AU2543597A (en) 1997-10-22
DE69702799D1 (de) 2000-09-21
KR100306541B1 (ko) 2001-11-30
ATE195606T1 (de) 2000-09-15
CN1092380C (zh) 2002-10-09
CA2244961A1 (en) 1997-10-09
MY119172A (en) 2005-04-30
DK0800166T3 (da) 2000-10-02
EP0800166B1 (en) 2000-08-16
EP0800166A2 (en) 1997-10-08
CN1099669C (zh) 2003-01-22
AU722720B2 (en) 2000-08-10
CA2200286C (en) 2000-05-16
CA2244961C (en) 2003-01-07
BR9701608A (pt) 1998-09-08
DE69713316T2 (de) 2002-10-24
DE69713316D1 (de) 2002-07-18
CA2200286A1 (en) 1997-10-01
WO1997037347A1 (en) 1997-10-09
JP4028599B2 (ja) 2007-12-26
JP3239293B2 (ja) 2001-12-17
ID16516A (id) 1997-10-09
DE69702799T2 (de) 2001-02-01
SG47213A1 (en) 1998-03-20
CN1213453A (zh) 1999-04-07
BR9708479B1 (pt) 2009-05-05
JPH1049890A (ja) 1998-02-20
CN1173015A (zh) 1998-02-11
US6314069B1 (en) 2001-11-06
US5689485A (en) 1997-11-18
AU1648397A (en) 1997-12-18
ATE219278T1 (de) 2002-06-15
IL126392A0 (en) 1999-05-09
JP2000509540A (ja) 2000-07-25
US6134199A (en) 2000-10-17
NO971114D0 (no) 1997-03-11
HK1003679A1 (en) 1998-11-06
MX9702229A (es) 1997-10-31
NO971114L (no) 1997-10-02
BR9708479A (pt) 1999-04-13
ES2118687T3 (es) 2000-10-16
EP0800166A3 (en) 1997-11-26
EP0892975A1 (en) 1999-01-27
DE69713316T4 (de) 2003-08-07
IL126392A (en) 2004-08-31
AU688234B2 (en) 1998-03-05
PT800166E (pt) 2000-12-29
NO316555B1 (no) 2004-02-02
EP0892975B1 (en) 2002-06-12

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