KR970029383A - Focus and Tracking Offset Automatic Adjustment Circuit in Compact Disc Players - Google Patents

Focus and Tracking Offset Automatic Adjustment Circuit in Compact Disc Players Download PDF

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KR970029383A
KR970029383A KR1019950042474A KR19950042474A KR970029383A KR 970029383 A KR970029383 A KR 970029383A KR 1019950042474 A KR1019950042474 A KR 1019950042474A KR 19950042474 A KR19950042474 A KR 19950042474A KR 970029383 A KR970029383 A KR 970029383A
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offset adjustment
signal
counter
focus
output
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KR1019950042474A
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Korean (ko)
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KR0167902B1 (en
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김제국
정우민
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김광호
삼성전자 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
    • G11B7/094—Methods and circuits for servo offset compensation

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  • Optical Recording Or Reproduction (AREA)

Abstract

본 포커스 및 트랙킹 오프셋 조정회로는 컴팩트디스크플레이어에 있어서 포커스 및 트랙킹에 대한 오프셋 조정범위를 정하고, 조정범위내에서만 오프셋을 자동조정하도록 하여 시스템의 리드인 타임을 단축시키기 위한 것이다. 이를 위하여 본 회로는 종단증폭기, 마이컴, 오프셋 조정범위 검출부, 카운터, 래치제어부, 오프셋 조정범위 검출부에서 출력되는 오프셋 조정여부신호와 카운터의 최소 및 최대값에 대한 모니터출력신호를 논리조합하여 마이컴에 오프셋조정작업에 대한 수행여부롤 전달하는 제1논리소자;카운터에서 출력되는 신호를 아날로그신호로 변환하여 종단증폭기의 오프셋 조정신호로 출력하는 디지탈/아날로그변환기를 포함하도록 구성된다.This focus and tracking offset adjustment circuit is for shortening the lead-in time of the system by setting an offset adjustment range for focus and tracking in a compact disc player and automatically adjusting the offset only within the adjustment range. To this end, this circuit performs a logical combination of the offset adjustment signal output from the termination amplifier, the microcomputer, the offset adjustment range detection unit, the counter, the latch control unit, and the offset adjustment range detection unit, and the monitor output signal for the minimum and maximum values of the counter to offset the microcomputer. A first logic element for transmitting the adjustment to perform the adjustment operation; It is configured to include a digital / analog converter for converting the signal output from the counter to an analog signal and outputs the offset adjustment signal of the termination amplifier.

Description

컴팩트디스플레이어에 있어서 포커스 및 트래킹 오프셋자동조정회로Focus and tracking offset automatic adjustment circuit in compact display

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제1도는 컴팩트디스크플레이어에 있어서 본 발명에 따른 포커스 및 트래킹 오프셋자동조정회로의 상세도.1 is a detailed view of a focus and tracking offset automatic adjustment circuit according to the present invention in a compact disc player.

제2도는 제1도에 도시된 래치펄스생성기의 상세회로도.2 is a detailed circuit diagram of the latch pulse generator shown in FIG.

Claims (8)

포커스 및 트랙킹루프의 종단증폭기 및 전반적인 기능을 제어하기 위한 마이컴을 구비하고 있는 컴팩트 디스크플레이어의 포커스 및 트랙킹 오프셋조정회로에 있어서, 상기 종단증폭기에서 출력되는 신호와 소정의 기준값을 이용하여 오프셋 조정범위를 검출하기 위한 오프셋 조정범위 검출부; 상기 마이컴에서 제공되는 오프셋 제어신호에 의하여 리셋되고 상기 오프셋 조정범위 검출부에서 출력되는 신호에 의하여 업 또는 다운카운트하기 위한 카운터; 상기 마이컴에서 제공되는 오프셋 제어신호와 카운터의 최소 및 최대값에 대한 모니터출력 신호 및 상기 카운터의 래치제어신호에 의하여 카운터의 래치상태를 제어하기 위한 래치제어부; 상기 오프셋 조정범위 검출부에서 출력되는 오프셋 조정여부신호와 상기 카운터의 최소 및 최대값에 대한 모니터출력신호를 논리조합하여 상기 마이컴에 오프셋조정작업에 대한 수행여부를 전달하는 제1논리소자; 상기 카운터에서 출력되는 신호를 아날로그신호로 변환하여 상기 종단증폭기의 오프셋 조정신호로 출력하는 디지탈/아날로그변환기를 포함함을 특징으로 하는 컴펙트디스크플레이어에 있어서 포커스 및 트래킹 오프셋조정회로.In the focus and tracking offset adjustment circuit of a compact disc player equipped with a microcomputer for controlling the end amplifier and the overall function of the focus and tracking loop, the offset adjustment range is determined by using a signal output from the end amplifier and a predetermined reference value. An offset adjustment range detector for detecting; A counter for up or down counting by a signal reset by an offset control signal provided by the microcomputer and output by the offset adjustment range detector; A latch control unit for controlling a latch state of a counter by an offset control signal provided by the microcomputer, a monitor output signal for minimum and maximum values of a counter, and a latch control signal of the counter; A first logic element configured to logically combine an offset adjustment signal output from the offset adjustment range detection unit with a monitor output signal for the minimum and maximum values of the counter to transmit whether to perform an offset adjustment operation to the microcomputer; And a digital / analog converter for converting the signal output from the counter into an analog signal and outputting the signal as an offset adjustment signal of the termination amplifier. 제l항에 있어서, 상기 오프셋 조정범위 검출부는, 제1기준전압과 상기 종단증폭기에서 출력되는 신호를 비교하여 상기 카운터의 다운카운트모드를 제어하기 위한 제1비교기, 제2기준전압과 상기 종단증폭기에서 출력되는 신호를 비교하여 상기 카운터의 업카운트모드를 제어하기 위한 제2비교기, 상기 제1비교기와 상기 제2비교기의 논리조합에 의하여 상기 오프셋 조정여부신호를 출력하는 제2논리소자를 포함함을 특징으로 하는 컴팩트디스크플레이어에 있어서 포커스 및 트랙킹 오프셋조정회로.The apparatus of claim 1, wherein the offset adjustment range detector comprises: a first comparator for controlling a down count mode of the counter by comparing a first reference voltage and a signal output from the termination amplifier, a second reference voltage, and the termination amplifier; And a second comparator for comparing the signals output from the second counter to control an up count mode of the counter, and outputting the offset adjustment signal by a logical combination of the first comparator and the second comparator. Focus and tracking offset adjustment circuit in a compact disc player, characterized in that. 제2항에 있어서, 상기 오프셋 조정회로는 상기 논리소자에서 출력되는 신호는 반전하여 상기 제1논리소자로 인가되는 상기 오프셋 조정여부신호를 제공하기 위한 인버터를 더 포함함을 특징으로 하는 컴팩트디스크플레이어에 있어서 포커스 및 트랙킹 오프셋조정회로.The compact disc player according to claim 2, wherein the offset adjustment circuit further comprises an inverter for providing the offset adjustment whether or not the signal output from the logic element is inverted and applied to the first logic element. Focus and tracking offset adjustment circuit in the circuit. 제2항에 있어서, 상기 오프셋 조정범위 검출부는 상기 제1기준전압을 +5mV로 설정하고, 상기 제2기준전압을 -50mV로 설정함을 특징으로 하는 컴팩트디스크플레이어에 있어서 포커스 및 트랙킹 오프셋조정회로.3. The focus and tracking offset adjustment circuit of claim 2, wherein the offset adjustment range detection unit sets the first reference voltage to +5 mV and the second reference voltage to -50 mV. . 제1항에 있어서, 상기 카운터는 상기 오프셋 조정범위 검출부에 의하여 상기 종단증폭기에서 출력된 오프셋 진압에 대한 조정이 필요없는 것으로 판단되면, 스톱모드를 유지하고, 상기 마이컴에 의하여 리세트될 때 설정된 카운트중심값을 상기 래치제어부에 의해 제어되어 래치함을 특징으로 하는 컴팩트디스크플레이어에 있어서 포커스 및 트래킹 오프셋조정회로.The counter set according to claim 1, wherein the counter maintains the stop mode and sets a count when the microcomputer is reset by the microcomputer if it is determined that the offset adjustment range detection unit does not need to adjust the offset suppression output from the termination amplifier. The focus and tracking offset adjustment circuit of claim 1, wherein the center value is controlled and latched by the latch control unit. 제1항 또는 제5항에 있어서, 상기 카운터는 상기 카운터의 상기 최소 및 최대값에 대한 모니터 출력신호에 의하여 카운트값이 최소 또는 최대값이 될 때, 상기 래치제어부에 의해 제어되어 카운트값을 래치함을 특징으로 하는 컴팩트디스크플레이어에 있어서 포커스 및 트랙킹 오프셋조정회로.The counter according to claim 1 or 5, wherein the counter is controlled by the latch control unit to latch the count value when the count value becomes a minimum or maximum value by a monitor output signal for the minimum and maximum values of the counter. Focus and tracking offset adjustment circuit in a compact disc player, characterized in that. 제3항에 있어서, 상기 래치제어부는, 상기 카운터로 인가되는 래치상태 제어신호와 상기 최소 및 최대값에 대한 모니터 출력신호를 논리조합하기 위한 제3논리소자, 상기 제3논리소자에서 출력되는 신호를 래치한 펄스를 생성하기 위한 래치펄스 생성기, 상기 래치펄스 생성기에서 출력되는 신호와 상기 마이컴의 오프셋 제어신호를 논리조합하기 위한 제4논리소자, 상기 제4논리소자에서 출력되는 신호와 상기 인버터에서 출력되는 신호를 논리조합하기 위한 제5논리소자로 이루어짐을 특징으로 하는 컴팩트디스크플레이어에 있어서 포커스 및 트랙킹 오프셋조정회로.The third logic device of claim 3, wherein the latch controller is configured to logically combine a latch state control signal applied to the counter and a monitor output signal for the minimum and maximum values, and a signal output from the third logic device. A latch pulse generator for generating a pulse latched by the latch, a fourth logic element for logically combining the signal output from the latch pulse generator and the offset control signal of the microcomputer, a signal output from the fourth logic element and the inverter A focus and tracking offset adjustment circuit in a compact disc player, characterized by comprising a fifth logical element for logically combining the output signals. 제1항에 있어서, 상기 제1논리소자는 상기 오프셋 조정여부신호와 상기 최소 및 최대값에 대한 모니터출력신호를 논리합하는 소자로 이루어짐을 특징으로 하는 컴팩트디스크플레이어에 있어서, 포커스 및 트랙킹 오프셋조정회로.2. The focus and tracking offset adjustment circuit of claim 1, wherein the first logic element comprises an element that logically sums the offset adjustment signal and the monitor output signal for the minimum and maximum values. . ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950042474A 1995-11-21 1995-11-21 Circuit for automatic focus and tracking offset in the cdp KR0167902B1 (en)

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KR1019950042474A KR0167902B1 (en) 1995-11-21 1995-11-21 Circuit for automatic focus and tracking offset in the cdp

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KR1019950042474A KR0167902B1 (en) 1995-11-21 1995-11-21 Circuit for automatic focus and tracking offset in the cdp

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KR970029383A true KR970029383A (en) 1997-06-26
KR0167902B1 KR0167902B1 (en) 1999-03-20

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JP4152257B2 (en) * 2003-05-26 2008-09-17 三洋電機株式会社 Optical disk offset adjustment circuit, integrated circuit, optical disk device, and offset adjustment method

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