KR950015254A - Tracking Error Detection Circuit in Optical Pick-up Device Using Doppler Effect - Google Patents

Tracking Error Detection Circuit in Optical Pick-up Device Using Doppler Effect Download PDF

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Publication number
KR950015254A
KR950015254A KR1019930023874A KR930023874A KR950015254A KR 950015254 A KR950015254 A KR 950015254A KR 1019930023874 A KR1019930023874 A KR 1019930023874A KR 930023874 A KR930023874 A KR 930023874A KR 950015254 A KR950015254 A KR 950015254A
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South Korea
Prior art keywords
unit
tracking error
signal
amplitude
optical pickup
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KR1019930023874A
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Korean (ko)
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KR960006097B1 (en
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한만준
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배순훈
대우전자 주식회사
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Publication of KR950015254A publication Critical patent/KR950015254A/en
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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
    • G11B7/08—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

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  • Optical Recording Or Reproduction (AREA)
  • Optical Radar Systems And Details Thereof (AREA)

Abstract

본 발명은 도플러효과를 이용하여 기준빔과 광디스크로부터의 반사빔을 중첩시키고 이때 기준빔과 반사빔의 간섭에 의한 맥놀이파를 검출하는 광픽업장치에서의 검출신호의 맥놀이파를 이용하여 트랙킹에러신호를 검출해내도록 된 도플러효과를 이용한 광픽업장치에서의 트랙킹에러검출회로를 제공하기 위한 것이다.The present invention uses a Doppler effect to superimpose a reflected beam from an optical disc and a reference beam, and at this time, a tracking error signal using a beat wave of a detection signal in an optical pickup apparatus that detects beat waves caused by interference between the reference beam and the reflected beam. It is to provide a tracking error detection circuit in an optical pickup device using the Doppler effect to detect a.

이를 위해 본 발명은, 빔을 발생시키는 발광부(20)와, 2개의 수광소자(50A, 50B)로 구성되어 기록매체(10)로부터의 반사빔과 상기 발광부(20)에서 주사된 기준빔을 인가받는 광검출부(50)를 갖춘 광픽업과; 트랙킹에러신호를 인가받아 트랙킹서보를 행하는 트랙킹서보부(100)를 구비한 광픽업장치에서의 트랙킹에러검출회로에 있어서; 상기 광검출부(50)와 제1수광소자(50A)의 출력신호로부터 소정 주파수 이하를 제거해서 RF신호의 맥놀이파를 검출해내는 제1필터부(82), 상기 제1필터부(82)의 출력신호의 진폭을 연산하는 제1진폭연산부(84), 상기 광검출부(50)와 제2수광소자(50B)의 출력신호로부터 소정 주파수 이하를 제거해서 RF신호의 맥놀이파를 검출해내는 제2필터부(86), 상기 제2필터부(86)의 출력신호의 진폭을 연산하는 제2진폭연산부(88) 및, 상기 제1진폭연산부(84)의 연산결과에서 상기 제2진폭연산부(88)의 연산결과를 감산하는 트랙킹에러를 계산해서 이 계산결과를 트랙킹에러신호로서 상기 트랙킹서보부(100)로 출력하는 트랙킹에러신호계산부(90)를 더 구비하여 이루어진 것을 특징으로 한다.To this end, the present invention comprises a light emitting unit 20 for generating a beam, and two light receiving elements 50A and 50B to reflect a beam from the recording medium 10 and a reference beam scanned by the light emitting unit 20. An optical pickup having a light detection unit 50 receiving the light; A tracking error detection circuit in an optical pickup apparatus having a tracking servo unit 100 that receives a tracking error signal and performs tracking servo; The first filter unit 82 and the first filter unit 82 detect the beat wave of the RF signal by removing the predetermined frequency or less from the output signals of the photodetector 50 and the first light receiving element 50A. A second amplitude detection unit 84 that calculates an amplitude of the output signal, a second that removes a predetermined frequency or less from the output signals of the photodetector 50 and the second light receiving element 50B to detect the beat wave of the RF signal The second amplitude calculation unit 88 in operation results of the filter unit 86, the second amplitude calculation unit 88 for calculating the amplitude of the output signal of the second filter unit 86, and the first amplitude calculation unit 84 The tracking error signal calculation unit 90 calculates a tracking error subtracting the result of the calculation and outputs the tracking error signal to the tracking servo unit 100 as a tracking error signal.

Description

도플러효과를 이용한 광픽업장치에서의 트래킹에러검출회로Tracking Error Detection Circuit in Optical Pick-up Device Using Doppler Effect

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 본 발명을 설명하기 위해 도플러효과를 이용한 광픽업장치를 나타낸 도면,1 is a view showing an optical pickup device using the Doppler effect to explain the present invention,

제2도는 본 발명에 따른 도플러효과를 이용한 광픽업장치에서의 트랙킹에러검출회로의 블럭도,2 is a block diagram of a tracking error detection circuit in the optical pickup apparatus using the Doppler effect according to the present invention;

Claims (1)

빔을 발생시키는 발광부(20)와, 2개의 수광소자(50A,50B)로 구성되어 기록매체(10)로부터의 반사빔과 상기 발광부(20)에서 주사된 기준빔을 인가받는 광검출부(50)를 갖춘 광픽업과 ; 트랙킹에러신호를 인가받아 트랙킹서보를 행하는 트랙킹서보부(100)를 구비한 광픽업장치에서의 트랙킹에러검출회로에 있어서 ; 상기 광검출부(50)의 제1수광소자(50A)의 출력신호로부터 소정 주파수 이하를 제거해서 RF신호의 맥놀이파를 검출해내는 제1필터부(82)와, 상기 제1필터부(82)의 출력신호의 진폭을 연산하는 제1진폭연산부(84), 상기 광검출부(50)의 제2수광소자(50B)의 출력신호로부터 소정 주파수 이하를 제거해서 RF신호의 맥놀이파를 검출해내는 제2필터부(86), 상기 제2필터부(86)의 출력신호의 진폭을 연산하는 제2진폭연산부(88) 및, 상기 제1진폭연산부(84)의 연산결과에서 상기 제2진폭연산부(88) 연산결과를 감산하여 트랙킹 에러를 계산하여 이 계산결과를 트랙킹에러신호로서 상기 트랙킹서보부(100)로 출력하는 트랙킹에러신호계산부(90)를 더 구비하여 이루어진 것을 특징으로 하는 도플러효과를 이용한 광픽업장치에서의 트랙킹에러검출회로.A light detecting unit 20 configured to generate a beam and two light receiving elements 50A and 50B to receive the reflected beam from the recording medium 10 and the reference beam scanned by the light emitting unit 20 ( 50) with optical pickup; A tracking error detection circuit in an optical pickup apparatus comprising a tracking servo unit 100 that receives a tracking error signal and performs tracking servo; A first filter unit 82 for detecting a beat wave of an RF signal by removing a frequency below a predetermined frequency from an output signal of the first light receiving element 50A of the photodetector 50, and the first filter unit 82 A first amplitude calculation unit 84 that calculates an amplitude of the output signal of the first detection unit 84 and a second wave that detects the beat wave of the RF signal by removing the predetermined frequency or less from the output signal of the second light receiving element 50B of the light detection unit 50 The second amplitude calculator (2), the second amplitude calculator (88) for calculating the amplitude of the output signal of the second filter (86), and the second amplitude calculator (2) in the calculation result of the first amplitude calculator (84). 88) A Doppler effect, characterized in that it further comprises a tracking error signal calculation unit 90 for calculating the tracking error by subtracting the calculation result and outputting the calculation result as the tracking error signal to the tracking servo unit 100. Tracking error detection circuit in the optical pickup device used. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019930023874A 1993-11-11 1993-11-11 Tracking error detector circuit at optical pick-up unit using doppler effect KR960006097B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019930023874A KR960006097B1 (en) 1993-11-11 1993-11-11 Tracking error detector circuit at optical pick-up unit using doppler effect

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019930023874A KR960006097B1 (en) 1993-11-11 1993-11-11 Tracking error detector circuit at optical pick-up unit using doppler effect

Publications (2)

Publication Number Publication Date
KR950015254A true KR950015254A (en) 1995-06-16
KR960006097B1 KR960006097B1 (en) 1996-05-08

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