KR880008253A - Tracking Servo Device of Optical Disc Drive - Google Patents

Tracking Servo Device of Optical Disc Drive Download PDF

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Publication number
KR880008253A
KR880008253A KR860011677A KR860011677A KR880008253A KR 880008253 A KR880008253 A KR 880008253A KR 860011677 A KR860011677 A KR 860011677A KR 860011677 A KR860011677 A KR 860011677A KR 880008253 A KR880008253 A KR 880008253A
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KR
South Korea
Prior art keywords
signal
difference signal
circuit
level detector
optical disc
Prior art date
Application number
KR860011677A
Other languages
Korean (ko)
Other versions
KR900002000B1 (en
Inventor
이재홍
Original Assignee
한형수
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.)
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Publication date
Application filed by 한형수, 삼성전자 주식회사 filed Critical 한형수
Priority to KR1019860011677A priority Critical patent/KR900002000B1/en
Publication of KR880008253A publication Critical patent/KR880008253A/en
Application granted granted Critical
Publication of KR900002000B1 publication Critical patent/KR900002000B1/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

Landscapes

  • Optical Recording Or Reproduction (AREA)

Abstract

내용 없음.No content.

Description

광디스크 구동장치의 트래킹 서보 장치Tracking Servo Device of Optical Disc Drive

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

제1도(a)는 디스크의 트랙상에 주빔 및 보조빔들이 투사되고 있는 형태를 나타내는 도면,FIG. 1 (a) is a diagram showing a state in which main and auxiliary beams are being projected onto a track of a disc;

제1도(b)는 트랙에 투사된 빔이 광픽업에 수광된 형태를 나타내는 도면,FIG. 1B is a view showing a form in which a beam projected on a track is received by an optical pickup;

제4도(a)는 본 발명에 의한 트래킹 서보장치를 나타내는 회로도,4A is a circuit diagram showing a tracking servo device according to the present invention;

제4도(b)는 흠집에 의한 광픽업의 트랙 이탈을 방지하는 과정을 설명하기 위한 파형도.FIG. 4B is a waveform diagram illustrating a process of preventing track deviation of an optical pickup due to scratches. FIG.

Claims (1)

광 디스크의 트랙에 투사되는 3개의 광빔 중 주빔(C)의 양측에 있는 보조빔(A)(B)의 반사광(A′)(B′)으로부터 소정의 광팩업(PA)(PB)에 의하여 얻어진 전기적 신호(A″)(B″)에 대하여 감산기(D)로써 차신호(K)를 얻어내고 이를 증폭회로(H)를 경유하여 트래킹 코일(E)에 인가하여 트래킹 동작을 수행하는 광디스크 구동장치의 트래킹 서보 장치에 있어서, 상기한 감산기(D)의 출력인 차신호(K)의 레벨을 대물렌즈가 트래킹에러신호를 추종할 수 있는 한계레벨(TH1)(TH2)과 대조하여 “하이”또는 “로우”의 논리신호를 발생하는 신호레벨 검출기(F)와 상기한 신호레벨 검출기(F)의 신호전달 시간만큼 상기한 차신호(K)를 지연시키는 지연부(L)와, 상기한 신호레벨 검출기(F)의 출력이 “로우”일때 상기 한 지연부(L)를 경유한 차신호(K)를 직접 증폭회로(H)에 전달하는 한편, 신호레벨 검출기(F)의 출력이 하이일 때에는 지연부(L)를 경유한 차신호(K)를 RC회로(I)에 전달하는 제어회로(G)와, 광디스크의 트랙상에 큰 흠집이 있어 제어회로(G)로부터 전달받은 펄스형태의 차신호(K)를 상기한 한계레벨(TH1)(TH2)보다 작은 신호(J)로 감쇄시켜 다시 제어회로(G)로 내보내는 RC회로(I)등을 포함하여 구성된 것을 특징으로 하는 광디스크 구동장치의 트래킹 서보 장치.From the reflected light A '(B') of the auxiliary beams A and B on both sides of the main beam C, among the three light beams projected on the track of the optical disk, the predetermined optical pack-up PA PAB is used. An optical disk drive for obtaining the difference signal K with the subtractor D with respect to the obtained electrical signals A ″ and B ″ and applying it to the tracking coil E via the amplifying circuit H to perform the tracking operation. In the tracking servo device of the device, the level of the difference signal K, which is the output of the subtractor D, is compared with the threshold level TH 1 (TH 2 ) at which the objective lens can follow the tracking error signal. A signal level detector F for generating a logic signal of high or low, a delay unit L for delaying the difference signal K by the signal transfer time of the signal level detector F, and When the output of one signal level detector F is "low", it transmits the difference signal K directly through the delay unit L to the amplifying circuit H. On the other hand, when the output of the signal level detector F is high, the control circuit G for transmitting the difference signal K via the delay unit L to the RC circuit I, and a large scratch on the track of the optical disc. RC circuit which attenuates the difference signal K in the form of pulse received from the control circuit G into a signal J smaller than the threshold level TH 1 , TH 2 , and sends it out to the control circuit G again. A tracking servo device for an optical disc drive device, including (I). ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019860011677A 1986-12-31 1986-12-31 Tracking servo of the optical disc operating apparatus KR900002000B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019860011677A KR900002000B1 (en) 1986-12-31 1986-12-31 Tracking servo of the optical disc operating apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019860011677A KR900002000B1 (en) 1986-12-31 1986-12-31 Tracking servo of the optical disc operating apparatus

Publications (2)

Publication Number Publication Date
KR880008253A true KR880008253A (en) 1988-08-30
KR900002000B1 KR900002000B1 (en) 1990-03-31

Family

ID=19254665

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019860011677A KR900002000B1 (en) 1986-12-31 1986-12-31 Tracking servo of the optical disc operating apparatus

Country Status (1)

Country Link
KR (1) KR900002000B1 (en)

Also Published As

Publication number Publication date
KR900002000B1 (en) 1990-03-31

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