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KR960025611A - Digital Servo Control Circuit in Optical Disc System - Google Patents

Digital Servo Control Circuit in Optical Disc System Download PDF

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Publication number
KR960025611A
KR960025611A KR1019940040655A KR19940040655A KR960025611A KR 960025611 A KR960025611 A KR 960025611A KR 1019940040655 A KR1019940040655 A KR 1019940040655A KR 19940040655 A KR19940040655 A KR 19940040655A KR 960025611 A KR960025611 A KR 960025611A
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KR
South Korea
Prior art keywords
digital
signal
analog
servo control
converter
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Application number
KR1019940040655A
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Korean (ko)
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KR100238262B1 (en
Inventor
이성진
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김광호
삼성전자 주식회사
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Publication of KR960025611A publication Critical patent/KR960025611A/en
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Publication of KR100238262B1 publication Critical patent/KR100238262B1/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
    • G11B7/0941—Methods and circuits for servo gain or phase compensation during operation
    • 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
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
    • G11B7/1267—Power calibration

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

본 발명은 광디스크 시스템에 있어서 디지탈 서보제어회로에 관한 것으로서, 광디스크에서 반사된 빛을 받아 포커싱 에러신호 혹은 트래킹 에러신호를 생성하여 증폭하기 위한 포토다이오드 및 증폭부와, 포토다이오드 및 증폭부에서 출력되는 아날로그신호를 샘플링하여 홀드하는 샘플＆홀드부와, 샘플링된 신호를 디지탈값으로 변환하는 아날로그/디지탈 변환기와, 서보제어신호를 연산처리하기 위한 디지탈신호 프로세서와, 디지탈신호프로세서에 의해 연산처리된 디지탈 서보제어신호를 아날로그신호로 변환하는 디지탈/아날로그 변환기와, 아날로그신호로 변환되어 입력되는 서보 제어신호에 의해 각종 서보를 구동하는 액츄에이터와, 아날로그/디지탈 변환기 및 디지탈/아날로그 변환기에 의해 변환된 신호의 출력기준전압을 서보 제어신호의 크기에 따라 제1전압 혹은 제2전압으로 절환시키도록 제어하는 콘트롤러로 구성된다. 따라서, 신호변환기의 사용범위를 최대한 할용할 수 있게 하여 고가의 해상도가 높은 변환기를 쓰지 않더라도 광디스크 시스템의 서보동작 이후의 미세한 에러신호의 제어가 가능하여 디지탈 서보의 단점인 샘플링 오차에 의한 신호왜곡을 방지할 수 있게 하였다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital servo control circuit in an optical disc system, comprising: a photodiode and amplifying unit for generating and amplifying a focusing error signal or a tracking error signal by receiving light reflected from the optical disc, and outputting from the photodiode and amplifying unit. A sample & hold unit for sampling and holding an analog signal, an analog / digital converter for converting the sampled signal to a digital value, a digital signal processor for calculating and processing a servo control signal, and a digital signal processed by the digital signal processor. The digital / analog converter converts the servo control signal into an analog signal, the actuator driving various servos by the servo control signal converted into the analog signal, and the signal converted by the analog / digital converter and the digital / analog converter. Servo control signal to output reference voltage It consists of a controller which controls to switch to a first voltage or a second voltage depending on the size. Therefore, it is possible to maximize the range of use of the signal converter, so that it is possible to control the minute error signal after the servo operation of the optical disk system without using a converter with a high resolution, thereby eliminating signal distortion due to sampling error, which is a disadvantage of digital servo. Prevented.

Description

광디스크 시스템에 있어서 디지탈 서보 제어회로Digital Servo Control Circuit in Optical Disc System

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

제3도는 본 발명에 의한 디지탈 서보 제어회로의 개념도.3 is a conceptual diagram of a digital servo control circuit according to the present invention.

Claims (3)

광디스크에서 반사된 빛을 받아 포커싱 에러신호 혹은 트래킹 에러신호를 생성하여 증폭하기 위한 포토다이오드 및 증폭부; 상기 포토다이오드 및 증폭부에서 출력되는 아날로그신호를 샘플링하여 홀드하기 위한 샘플＆홀드부; 상기 샘플링된 신호를 디지탈값으로 변환하기 위한 아날로그/디지탈 변환기; 서보 제어신호를 연산 처리하기 위한 디지탈신호 프로세서; 상기 디지탈신호 프로세서에 의해 연산처리된 디지탈 서보제어신호를 아날로그신호로 변환하기 위한 디지탈/아날로그 변환기; 아날로그신호로 변환되어 입력되는 서보 제어신호에 의해 각종 서보를 구동하는 액츄에이터; 및 상기 아날로그/디지탈 변환기 및 디지탈/아날로그 변환기에 의해 변환된 신호의 출력기준전압을 상시 서보 제어신호의 크기에 따라 제1전압 혹은 제2전압으로 절환시키도록 제어하는 콘트롤러를 포함하는 것을 특징으로 하는 광디스크 시스템에 있어서 디지탈 서보제어회로.A photodiode and amplifying unit for generating and amplifying a focusing error signal or a tracking error signal by receiving the light reflected from the optical disk; A sample & hold unit for sampling and holding the analog signal output from the photodiode and amplification unit; An analog / digital converter for converting the sampled signal into a digital value; A digital signal processor for calculating and processing a servo control signal; A digital / analog converter for converting a digital servo control signal computed by the digital signal processor into an analog signal; An actuator for driving various servos by a servo control signal converted into an analog signal; And a controller for controlling the output reference voltage of the signal converted by the analog / digital converter and the digital / analog converter to be switched to the first voltage or the second voltage according to the magnitude of the servo control signal at all times. Digital servo control circuit in optical disc system. 제1항에 있어서, 서보를 온하기 이전에 서보 제어신호가 상기 아날로그/디지탈 변환기 및 디지탈/아날로그 변환기에 입력될 경우, 상기 콘트롤러는 상기 제1전압보다 큰 값의 제2전압을 상기 아날로그/디지탈 변환기 및 디지탈/아날로그 그 변환기에 인가하도록 제어하는 것을 특징으로 하는 광디스크 시스템에 있어서 디지탈 서보제어회로.The controller of claim 1, wherein when a servo control signal is input to the analog / digital converter and the digital / analog converter before turning on the servo, the controller is configured to supply a second voltage having a value greater than the first voltage. A digital servo control circuit for an optical disc system, characterized by controlling to be applied to a converter and a digital / analog converter thereof. 제1항에 있어서, 포커싱 또는 트래킹 서보 동작 이후에는 서보 동작 신호와 동기되도록 설계한 상기 콘트롤러에 의해 상기 제2전압보다 작은 값의 제1전압을 상기 아날로그/디지탈 변환기 및 디지탈/아날로그 그 변화기에 인가하도록 제어하는 것을 특징으로 하는 광디스크 시스템에 있어서 디지탈 서보제어회로.2. The method of claim 1, wherein after the focusing or tracking servo operation, the first voltage having a value smaller than the second voltage is applied to the analog / digital converter and the digital / analog converter by the controller designed to be synchronized with the servo operation signal. And a digital servo control circuit in an optical disc system. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019940040655A 1994-12-31 1994-12-31 Digital servo control circuit in an optical disc system KR100238262B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019940040655A KR100238262B1 (en) 1994-12-31 1994-12-31 Digital servo control circuit in an optical disc system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019940040655A KR100238262B1 (en) 1994-12-31 1994-12-31 Digital servo control circuit in an optical disc system

Publications (2)

Publication Number Publication Date
KR960025611A true KR960025611A (en) 1996-07-20
KR100238262B1 KR100238262B1 (en) 2000-01-15

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Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR0178410B1 (en) * 1992-05-30 1999-04-01 강진구 Multi-axis servo control method using sample / holder
KR100287493B1 (en) * 1993-02-12 2001-04-16 이데이 노부유끼 Disc drive

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