KR950015255A - Focusing Error Detection Circuit in Optical Pick-up Device Using Doppler Effect - Google Patents

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

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Publication number
KR950015255A
KR950015255A KR1019930023875A KR930023875A KR950015255A KR 950015255 A KR950015255 A KR 950015255A KR 1019930023875 A KR1019930023875 A KR 1019930023875A KR 930023875 A KR930023875 A KR 930023875A KR 950015255 A KR950015255 A KR 950015255A
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South Korea
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unit
frequency
signal
focusing error
focusing
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KR1019930023875A
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Korean (ko)
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KR960006098B1 (en
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한만준
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배순훈
대우전자 주식회사
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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)

Abstract

본 발명은 본 발명은 도플러효과를 이용하여 기준빔과 기록매체로부터의 반사빔을 중첩시키고 이때 기준빔과 반사빔의 간섭에 의한 맥놀이파를 검출하는 광픽업장치에서의 검출신호의 맥놀이파의 주파수를 이용하여 포커싱에러신호를 검출해내도록 된 도플러효과를 이용한 광픽업장치에서의 포커싱에러검출회로를 제공하기 위한 것이다.The present invention uses the Doppler effect to overlap the reflected beam from the reference beam and the recording medium, and at this time the frequency of the beat wave of the detection signal in the optical pickup device for detecting the beat wave by the interference of the reference beam and the reflected beam To provide a focusing error detection circuit in the optical pickup apparatus using the Doppler effect to detect the focusing error signal by using a.

이를 위해 본 발명은, 빔을 발생시키는 발광부(20), 기록매체(10)로부터의 반사빔과 상기 발광부(20)에서 주사된 기준빔을 인가받아 광검출부(50)를 갖춘 광픽업과; 포커싱에러신호를 인가받는 포커싱서보를 행하는 포커싱서보부(105)를 구비한 광픽업장치에서의 포커싱에러검출회로에 있어서; 상기 광검출부(50)로부터의 출력신호중에서 포커싱에러신호에 해당하는 소정주파수 이하의 주파수성분만을 검출하는 필터부(70)와, 상기 필터부(70)에서 출력된 신호의 주파수를 연산하는 주파수연산부(75), 상기 주파수연산부(75)에서 연산된 주파수신호를 속도신호로 변환하는 주파수/속도변환부(80), 상기 주파수/속도변환부(80)에서 변환된 속도신호를 적분하여 구한 포커싱에러신호의 변위의 크기를 상기 포커싱서보부(105)로 출력하는 적분부(90) 및, 상기 광검출부(50)의 출력신호로부터 포커싱에러신호의 변위의 방향을 검출하는 방향검출부(100)를 더 구비하여 이루어진 것을 특징으로 한다.To this end, the present invention provides an optical pickup including a light emitting unit 20 for generating a beam, a reflection beam from the recording medium 10, and a reference beam scanned by the light emitting unit 20, and having a light detecting unit 50. ; A focusing error detection circuit in an optical pickup apparatus having a focusing servo section 105 that performs a focusing servo that receives a focusing error signal; A filter unit 70 for detecting only a frequency component below a predetermined frequency corresponding to a focusing error signal among the output signals from the photodetector 50, and a frequency calculator for calculating the frequency of the signal output from the filter unit 70. (75), a focusing error obtained by integrating the frequency signal calculated by the frequency operation unit 75 into a speed signal and a frequency signal converted by the frequency / speed conversion unit 80; An integrating unit 90 for outputting the magnitude of the displacement of the signal to the focusing servo unit 105, and a direction detecting unit 100 for detecting the direction of displacement of the focusing error signal from the output signal of the photodetector 50; Characterized in that provided.

Description

도플러효과를 이용한 광픽업장치에서의 포커싱에러검출회로Focusing 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 포커싱에러검출회로의 블럭도이다.2 is a block diagram of a focusing error detection circuit in the optical pickup apparatus using the Doppler effect according to the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

10 : 광디스크 20 : 광량검출부10: optical disk 20: light quantity detection unit

90 : 비교부 105 : 포커싱서보부90: comparison unit 105: focusing servo unit

Claims (2)

빔을 발생시키는 발광부(20)와, 기록매체(10)로부터의 반사빔과 상기 발광부(20)에서 주사된 기준빔을 인가받는 광검출부(50)를 갖춘 광픽업과, 포커싱에러신호를 인가받아 포커싱서보를 행하는 포커싱서보부(105)를 구비한 광픽업장치에서의 포커싱에러검출회로에 있어서, 상기 광검출부(50)로부터의 출력신호중에서 포커싱에러신호에 해당하는 소정주파수 이하의 주파수성분만을 검출하는 필터부(70)와, 상기 필터부(70)에서 출력된 신호의 주파수를 연산하는 주파수연산부(75), 상기 주파수연산부(75)에서 연산된 주파수신호를 속도신호로 변환하는 주파수/속도변환부(80), 상기 주파수/속도변환부(80)에서 변환된 속도신호를 적분하여 구한 포커싱에러신호의 변위의 크기를 상기 포커싱서보부(105)로 출력하는 적분부(90) 및, 상기 광검출부(50)의 출력신호로부터 포커싱에러신호의 변위의 방향을 검출하는 방향검출부(100)를 더 구비하여 이루어진것을 특징으로 하는 도플러효과를 이용한 광픽업장치에서의 포커싱에러검출회로.An optical pickup having a light emitting unit 20 for generating a beam, a reflective beam from the recording medium 10, and a light detecting unit 50 for receiving a reference beam scanned by the light emitting unit 20, and a focusing error signal. A focusing error detection circuit in an optical pickup apparatus having a focusing servo section 105 that is applied and performs focusing servo, wherein a frequency component equal to or less than a predetermined frequency corresponding to a focusing error signal among the output signals from the photodetector 50 is provided. Filter unit 70 for detecting only, frequency operation unit 75 for calculating the frequency of the signal output from the filter unit 70, frequency for converting the frequency signal calculated by the frequency operation unit 75 to the speed signal / An integrating unit 90 for outputting the magnitude of the displacement of the focusing error signal obtained by integrating the speed signal converted by the speed converting unit 80 and the frequency / speed converting unit 80 to the focusing servo unit 105; As an output signal of the photodetector 50 And a direction detecting unit (100) which detects a direction of displacement of the focusing error signal from the focusing error detecting circuit in the optical pickup apparatus using the Doppler effect. 제1항에 있어서, 상기 방향검출부(100)는 상기 광검출부(50)의 출력신호로부터 광량을 검출하는 광량검출부(85)와, 이 광량검출부(85)의 검출결과를 소정의 기준치와 비교하여 그 비교결과로서 포커성에러신호의 변위의 방향을 상기 포커싱서보부(105)로 출력하는 비교부(95)로 이루어진 것을 특징으로 하는 도플러효과를 이용한 광픽업장치에서의 포커싱에러검출회로.The method of claim 1, wherein the direction detecting unit 100 compares the detection result of the light amount detecting unit 85 and the predetermined amount of light with the light amount detecting unit 85 for detecting the light amount from the output signal of the light detecting unit 50. A focusing error detection circuit in an optical pickup apparatus using a Doppler effect, comprising: a comparing section (95) for outputting a direction of displacement of a focusing error signal to the focusing servo section (105) as a result of the comparison. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019930023875A 1993-11-11 1993-11-11 Focusing circuit at optical pick-up using doppler effect KR960006098B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019930023875A KR960006098B1 (en) 1993-11-11 1993-11-11 Focusing circuit at optical pick-up using doppler effect

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Application Number Priority Date Filing Date Title
KR1019930023875A KR960006098B1 (en) 1993-11-11 1993-11-11 Focusing circuit at optical pick-up using doppler effect

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KR950015255A true KR950015255A (en) 1995-06-16
KR960006098B1 KR960006098B1 (en) 1996-05-08

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