KR870000596Y1 - Focus automatic tracking circuit of optical disk device - Google Patents

Focus automatic tracking circuit of optical disk device Download PDF

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Publication number
KR870000596Y1
KR870000596Y1 KR2019840013017U KR840013017U KR870000596Y1 KR 870000596 Y1 KR870000596 Y1 KR 870000596Y1 KR 2019840013017 U KR2019840013017 U KR 2019840013017U KR 840013017 U KR840013017 U KR 840013017U KR 870000596 Y1 KR870000596 Y1 KR 870000596Y1
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KR
South Korea
Prior art keywords
transistor
output
signal stage
oscillator
optical disk
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KR2019840013017U
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Korean (ko)
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KR860008563U (en
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최영진
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주식회사금성사
허신구
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Priority to KR2019840013017U priority Critical patent/KR870000596Y1/en
Publication of KR860008563U publication Critical patent/KR860008563U/en
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Publication of KR870000596Y1 publication Critical patent/KR870000596Y1/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
    • G11B7/0908—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 for focusing only
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs

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  • Optical Recording Or Reproduction (AREA)

Abstract

내용 없음.No content.

Description

회로광 학식디스크장치의 초점 자동 추적회로Focus tracking circuit of circuit optical disc device

제 1 도는 본 고안의 회로도.1 is a circuit diagram of the present invention.

제 2 도는 본 고안의 각부 파형도.2 is a waveform diagram of each part of the present invention.

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

가 : 발진기 나 : 구형파 발진부A: Oscillator B: Square wave oscillator

다 : 증폭부 라 : 삼각파 발진부C: amplification part D: triangle wave oscillation part

T1,T2,T3: 스위칭용 트랜지스터T 1 , T 2 , T 3 : Switching Transistor

본 고안은 광학식 디스크플레이 장치에 있어서, 디스크상의 정보를 검출하는 렌즈를 자동으로 조절하여 초기 상태시 초점거리를 정확히 유지 시키려는 회로에 관한 것이다.The present invention relates to a circuit for an optical disc play apparatus, which automatically maintains a focal length in an initial state by automatically adjusting a lens for detecting information on a disc.

광학식 디스크 플레이 장치에 있어서는 디스크상의 정보를 검출하는 렌즈가 있고, 이 렌즈는 항상 디스크와의 일정거리를 유지하여야 정보검출을 정확히 할수 있다. 그리고, 초기 상태시에 초점 거리를 맞추는데 있어서도 렌즈를 상하로 이동시켜 초점거리를 빠른 시간내에 수정을 하여야 한다.In an optical disc play apparatus, there is a lens for detecting information on a disc, and this lens must always maintain a certain distance from the disc to accurately detect information. Also, in adjusting the focal length in the initial state, the lens should be moved up and down to correct the focal length in a short time.

종래에는 렌즈에 저주파(1-ZHZ)를 인가하여 렌즈를 상하로 이동시켜서 초점거리를 맞추었으나, 그 감도가 떨어지므로 그 신뢰성에서 단점이 있었던 것이었다.Conventionally, a low frequency (1-ZHZ) was applied to a lens to move the lens up and down to adjust the focal length, but the sensitivity thereof was inferior in reliability.

본 고안은 종래의 이러한 단점을 해소 하고자 안출한 것인데, 이는 기존의 촛점 거리제어용 저주파에 다른 주파수를 합성시켜 촛점거리의 맞추는 감도를 높여주는 회로를 구비하므로써 이러한 회로의 신뢰성을 향상 시키려는데 그목적이 있는 것이다.The present invention has been made to solve such disadvantages of the prior art, which is designed to improve the reliability of such a circuit by providing a circuit for synthesizing another frequency to a low frequency for focusing distance control to increase the focusing sensitivity. It is.

이하에서 이를 상세히 설명하면 다음과 같다. 초점제어신호단(FP)과 파형 감지 신호단(PD)의 입력계에 있어서, 상기 초점제어 신호단(FP)을 연산증폭기(OP4), 가변저항(VR)으로 구성된 증폭부 (다)의 연산증폭기(OP4) 반전단자(-)에 연결하고, 그 출력은 촛점제어 코일(FL)에 연결한다.This will be described in detail below. In the input system of the focus control signal stage FP and the waveform detection signal stage PD, the focus control signal stage FP is formed of an operational amplifier OP 4 and a variable resistor VR. The operational amplifier OP 4 is connected to the inverting terminal (-) and its output is connected to the focus control coil FL.

상기 증폭기(OP4)의 입력 라인에 스위칭용 트랜지스터(T1)를 연결하고, 이의 게이트단은 파형감지신호단(PD)에 연결한다.The switching transistor T 1 is connected to the input line of the amplifier OP 4 , and the gate terminal thereof is connected to the waveform detection signal terminal PD.

상기 파형감지 신호단(PD)은 또한 연산증폭기(OP2)로 구성된 구형파 발진부 (나)와 연산증폭기(OP3), 컨덴서(o)의 삼각부 발진부 (라) 사이의 트랜지스터(T2) 게이트단 및, 연산 증폭기(OP1)로 구성된 발진기 (가)의 출력라인 스위칭용 트랜지스터(T3)의 게이트단에 연결되는 구성을 가진다.The waveform detection signal stage PD also has a gate of a transistor T 2 between a square wave oscillator (B) consisting of an operational amplifier (OP 2 ), an operational amplifier (OP 3 ), and a triangular oscillator (D) of a capacitor (o). And an output line switching transistor T 3 of an oscillator (A) composed of an operational amplifier OP 1 .

상기, 발진기(가)의 출력은 증폭부(다)의 연산 증폭기(OP4) 비 반전단자(+)에 연결시킨 가변저항(VR)에 접속되는 구성이다.The output of the oscillator (a) is connected to the variable resistor (VR) connected to the non-inverting terminal (+) of the operational amplifier (OP 4 ) of the amplifier (C).

이러한 구성의 본 고안은 파형감지 신호단(PD)엔 디스크상에서 감지된 파형이 제2(a)도와 같이 나타나고, 이는 트랜지스터(T1-T5) 게이트단에 가가해져서 이 트랜지스터(T1,T2)는 각기 언(ON) 트랜지스터(Tε)는 오프(OFF)된다. 이에 따라 발진기(가)에서는 일정 주파수(200Hz 정도)를(제2(b)도)를 증폭부(다)의 비반전단자(+)에 가하게 된다.According to the present invention of this configuration, the waveform detected on the disk in the waveform detection signal stage PD is shown as the second (a) figure, which is applied to the gate terminals of the transistors T 1 -T 5 so that the transistors T 1 , T 2 ), the ON transistor T ε is turned off. Accordingly, the oscillator (a) applies a predetermined frequency (about 200 Hz) (second (b)) to the non-inverting terminal (+) of the amplifying unit (c).

한편, 상기 트랜지스터(T2)의 언동작으로 구형파 발생부(나)의 출력(1-2HZ) 제2도의 (o)와 같이 트랜지스터(T2)를 거쳐 삼각파 발생부(라)로 가해지고 이의 출력(제2(d)도)은 상기 발진기(가)출력과 합성되어 제2(e)도와 같이 되는 것이다.On the other hand, the transistor T 2 is applied to the triangular wave generator D through the transistor T 2 as shown in FIG. The output (second (d)) is combined with the output of the oscillator (a) to become the second (e).

한편, 초점제어 신호단(FP)의 출력은 트랜지스터(T1)에 의해 차단되므로 상기 증폭부(다)의 출력은 제2(e)도와 같은 파형에 의하여 초점제어 코일(FL)을 조정하게 되며, 이에 따라 렌즈는 1초에 1-2회 상하로 움직이게 된다.On the other hand, since the output of the focus control signal stage FP is cut off by the transistor T 1 , the output of the amplifying unit C adjusts the focus control coil FL according to the waveform shown in FIG. Therefore, the lens moves up and down 1-2 times in 1 second.

렌즈가 상하로 움직이다가 초점거리가 맞으면 파형감지 신호단(PD)의 출력이 논리 1→0로 되어 트랜지스터(T1,T2) 오프, 트랜지스터(T3)를 언시켜 발진동작을 정지하는 것이다.When the lens moves up and down and the focal length is correct, the output of the waveform detection signal stage PD goes from logic 1 to 0 so that the transistors T 1 and T 2 are turned off and the transistor T 3 is turned off to stop the oscillation operation. will be.

이러한 본 고안은 광학식 디스크 장치에서 저주파(1-2Hz)에 의한 정보 검출용 렌즈의 일정한 초점거리를 맞춰주는 방식을 탈피하여 비교적 높은 주파수(200Hz 정도)에 의한 변조방식을 취하므로써 초점거리 맞춤을 신속히 진행시키면서도 그 신뢰성을 향상시킨 유익한 특징이 있는 것이다.This invention devises a focal length adjustment by adopting a modulation method using a relatively high frequency (about 200 Hz), avoiding the method of adjusting a constant focal length of a low frequency (1-2 Hz) information detecting lens in an optical disk device. There is a beneficial feature that improves the reliability while going forward.

Claims (1)

초점제어 신호단(FP)과 파형감지 신호단(PD)을 가진 광학식 디스크 장치에 있어서 상기 초점제어 신호단(FP)에 증폭부(다)의 일단을 연결하고 파형감지 신호단(PD)엔 트랜지스터(T1,T2)의 게이트단을 연결하며, 상기 트랜지랜지스터(T2)로 언, 오프 제어되는 구형파발생부(나)와 삼각파 발생부(라)를 연결하고, 이 삼각파 발생부(라)의 출력과 발진기(가)의 출력을 공접하여 증폭부(다)의 연산증폭기(OP4) 비반전단자(+)에 가해지도록 연결하며, 발진기(가)의 출력부에 상기 트랜지스터(T1,T2)와 역동작의 제3의 트랜지스터(T3)를 접속시켜서 됨을 특징으로 하는 광학식 디스크 장치의 초점 자동 추적회로.In an optical disc device having a focus control signal stage (FP) and a waveform detection signal stage (PD), one end of an amplifier (C) is connected to the focus control signal stage (FP), and the waveform detection signal stage (PD) is a transistor. A gate terminal of (T 1 , T 2 ), and a square wave generator (B) and a triangle wave generator (D), which are controlled by the transistor T 2 , are turned on and off. The output of (D) and the output of the oscillator (A) are connected to each other so as to be applied to the non-inverting terminal (+) of the operational amplifier (OP 4 ) of the amplifying unit (C), and the transistor (A) is connected to the output of the oscillator (A). T 1 , T 2 ) and a third transistor (T 3 ) of reverse operation connected to each other.
KR2019840013017U 1984-12-11 1984-12-11 Focus automatic tracking circuit of optical disk device KR870000596Y1 (en)

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Application Number Priority Date Filing Date Title
KR2019840013017U KR870000596Y1 (en) 1984-12-11 1984-12-11 Focus automatic tracking circuit of optical disk device

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Application Number Priority Date Filing Date Title
KR2019840013017U KR870000596Y1 (en) 1984-12-11 1984-12-11 Focus automatic tracking circuit of optical disk device

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KR860008563U KR860008563U (en) 1986-07-28
KR870000596Y1 true KR870000596Y1 (en) 1987-02-21

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KR860008563U (en) 1986-07-28

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