KR920004222Y1 - Auto focus controlling circuit for a video camera - Google Patents
Auto focus controlling circuit for a video camera Download PDFInfo
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- KR920004222Y1 KR920004222Y1 KR2019890002030U KR890002030U KR920004222Y1 KR 920004222 Y1 KR920004222 Y1 KR 920004222Y1 KR 2019890002030 U KR2019890002030 U KR 2019890002030U KR 890002030 U KR890002030 U KR 890002030U KR 920004222 Y1 KR920004222 Y1 KR 920004222Y1
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- output
- microcomputer
- video camera
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
- G03B13/34—Power focusing
- G03B13/36—Autofocus systems
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B3/00—Focusing arrangements of general interest for cameras, projectors or printers
- G03B3/10—Power-operated focusing
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automatic Focus Adjustment (AREA)
- Focusing (AREA)
Abstract
내용 없음.No content.
Description
제 1 도는 본 고안 회로도.1 is a circuit diagram of the present invention.
제 2 도는 본 고안 증폭부의 상세회로도.2 is a detailed circuit diagram of the amplification unit of the present invention.
제 3 도는 본 고안 적분부의 상세회로도.3 is a detailed circuit diagram of the present invention integration unit.
제 4 도는 A/D변환부의 상세회로도.4 is a detailed circuit diagram of an A / D converter.
제 5 도는 모터구동부의 상세회로도.5 is a detailed circuit diagram of the motor driver.
제 6 도는 종래의 회로도.6 is a conventional circuit diagram.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 2분할 수광소자 2 : 증폭기1: 2 split light receiving element 2: amplifier
3 : 반전기 4 : 분압회로3: inverter 4: voltage divider circuit
5 : 비교기 10 : 증폭부5: comparator 10: amplifier
20 : 적분부 30 : A/D변환부20: Integrator 30: A / D converter
40 : 마이크로 컴퓨터 50 : 모터구동부40: microcomputer 50: motor drive unit
60 : 적외선 구동부60: infrared drive unit
본 고안은 비데오 카메라의 촛점 조절회로에 관한 것으로, 특히 적외광을 피사체에 투광하여 되돌아오는 것을 전기적 신호로 변환시켜 거리 측정 연산처리에 의해 모터로 구동시켜 자동적으로 비데오 카메라에 촛점을 맺히게 하는 자동촛점 조절(Autofocusing)회로에 관한 것이다.The present invention relates to a focusing control circuit of a video camera, and in particular, an automatic focus that automatically focuses on a video camera by converting an infrared light into a subject and converting it back into an electrical signal and driving it by a motor by a distance measuring operation process. It relates to an autofocusing circuit.
종래에 비데오 카메라에서 촛점을 조절하기 위해서는 수동방식을 사용하여 피사체에 촛점을 맞추기 때문에 정확도가 떨어지며, 피사체가 움직이게 되면 수시로 제조작을 해야하는 불편함이 있었다. 이를 개선한 것이 자동촛점 조절회로로써, 제 6 도는 일반적인 자동촛점 조절회로를 블럭으로 도시한 것이다.In the related art, in order to adjust the focus of a video camera, the accuracy is decreased because the focus is focused on the subject by using a manual method, and there is an inconvenience in that the production of the subject should be made from time to time. The improvement is an autofocus control circuit, and FIG. 6 shows a general autofocus control circuit as a block.
종래에는 제 6 도에서와 같이 적분기의 출력신호가 바로 연산처리회로로 입력되어 그 출력에 의해 모터 구동회로를 동작시키므로 정밀도가 낮아 특히 빠른 속도로 촛점이 이동될때에 고화질을 얻을 수없는 문제점이 있었다.In the related art, as shown in FIG. 6, the output signal of the integrator is directly input to the operation processing circuit, and the motor driving circuit is operated by the output. Therefore, there is a problem in that high image quality cannot be obtained especially when the focus is moved at a high speed. .
본 고안은 상기한 문제점을 해결하기 위하여 안출한 것으로 고속의 고화질을 제공하는 비데오 카메라의 자동 촛점 조절회로를 제공하는 것을 그 목적으로 한다.An object of the present invention is to provide an automatic focus control circuit of a video camera that provides a high speed and high quality to solve the above problems.
이하 첨부된 제 1 도 내지 제 5 도를 참조하여 본 고안을 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to FIGS. 1 to 5.
제 1 도는 본 고안 회로도로서, 적외광을 전기적신호로 증폭하는 적외선 증폭부(10), 증폭된 신호를 일정시간동안 적분하는 적분부(20), 적분부(20)의 출력신호VA와 VB를 거리측정용 정보로 사용하기 위해 신호를 변환하는 A/D변환부(30), 거리측정 연산을 하는 마이크로 컴퓨터(40), 모터구동부(50) 및 적외선 발광다이오드 구동용 적외선 구동부(60)로서 구성된다.FIG. 1 is a circuit diagram of the present invention, which includes an infrared amplifying unit 10 for amplifying infrared light into an electrical signal, an integrating unit 20 for integrating the amplified signal for a predetermined time, and output signals VA and VB of the integrating unit 20. It is configured as an A / D conversion unit 30 for converting a signal for use as distance measurement information, a microcomputer 40 for performing a distance measurement operation, a motor driver 50 and an infrared drive unit 60 for driving an infrared light emitting diode. do.
상기한 각부(10, 20, 30, 50)의 상세회로도는 제 2 도 내지 제 5 도에 도시되었으며, 이를 참조하여 본 고안회로의 동작을 설명하면 다음과 같다.Detailed circuit diagrams of the respective parts 10, 20, 30, and 50 are illustrated in FIGS. 2 to 5, and the operation of the inventive circuit will be described below with reference to the drawings.
마이크로 컴퓨터(40)에서 동기신호(SYNC)를 발생시켜 적외선 구동부(60)고 입력하여, 적외선 구동부(60)에서 적외선 발광다이오드를 구동하여 펄스형 적외선을 피사체에 투광시킨다.The microcomputer 40 generates a sync signal SYNC and inputs the infrared signal to the infrared driver 60, and the infrared driver 60 drives the infrared light emitting diode to emit pulsed infrared light onto the subject.
피사체에 도달하여 되돌아오는 적외광을 증폭부(10)인 제 2 도의 2분할 수광소자(1)에서 전류신호로 변환한다.The infrared light reaching the subject and returned is converted into a current signal by the two-split light receiving element 1 of FIG.
변환된 전류신호는 미소량이므로 증폭기(2)를 통하여 전압으로 증폭한 후 반전기(3)에 의해 증폭된 전압을 반전시킨다.Since the converted current signal is a small amount, it is amplified by the voltage through the amplifier 2 and then inverted by the inverter 3.
상기한 반전기(3)의 출력신호는 제 3 도와 같은 적분부(20)로 입력되며 적분부(20)에서는 마이크로 컴퓨터(40)에서 일정기간 동안 내보낸 동기신호(SYNC)에 의해 해당시간 만큼 적분시켜 입력신호(A,B)에 대한 출력 신호(VA, VB)를 만들어 낸다.The output signal of the inverter 3 is input to the integrating unit 20 as in the third degree, and in the integrating unit 20 by the synchronizing signal SYNC exported by the microcomputer 40 for a predetermined period of time. Integral produces output signals VA and VB for input signals A and B.
상기 적분부(20)의 출력신호는 A/D변환부(30)로 인가되는데, A/D변환부(30)에서는 제 4 도에 도시한 바와같이 분압회로(4)에 의해 입력신호를 분압하여 비교기(5)를 통하여 4개의 출력신호 VB - (VA*VD), VA - (VB*VD), (VA+VB) - VL, (VA+VB) - VH를 발생시켜 마이크로 컴퓨터(40)로 인가한다.The output signal of the integrating unit 20 is applied to the A / D converter 30. In the A / D converter 30, the input signal is divided by the voltage dividing circuit 4 as shown in FIG. To generate four output signals VB-(VA * VD), VA-(VB * VD), (VA + VB)-VL, (VA + VB)-VH through the comparator 5 Is applied.
따라서 마이크로 컴퓨터(40)는 상기한 비교기(5)의 4개의 출력신호를 입력신호로 받아들여 피사체의 거리측정용 연산정보로 활용하며, 이 정보에 의해 모터구동부(50)로 LOW, FAR, NEAR의 세가지 출력신호를 인가한다.Accordingly, the microcomputer 40 receives the four output signals of the comparator 5 as input signals and uses them as calculation information for distance measurement of the subject, and the motor driving unit 50 uses the information as LOW, FAR, and NEAR. Apply three output signals.
상기 세가지의 출력신호에 의해 자동촛점 조절용 모터(M)가 회전하여 자동으로 촛점을 맞추도록 비데오 카메라렌즈의 경통을 움직이며, 촛점이 맞는 지점에서 모터가 정지하게 된다.In response to the three output signals, the lens of the video camera lens is moved so that the auto focusing motor M rotates to automatically focus, and the motor stops at the point where the focus is correct.
제 5 도의 모터구동부 동작을 설명하면 다음과 같다.The operation of the motor driving unit of FIG. 5 is as follows.
먼저 LOW신호가 마이크로 컴퓨터(40)로 부터 하이레벨로 출력되면 트랜지스터(TR2)로 트랜지스터(TR1)를 통하여 흐르는 전류가 흐르게되어 트랜지스터(TR3)를 통하여 자동촛점 조절용 모터(M)로 흐르는 전류를 제한하게 된다.First, when the LOW signal is output from the microcomputer 40 at a high level, a current flowing through the transistor TR1 flows to the transistor TR2 to limit the current flowing through the transistor TR3 to the autofocus control motor M. Done.
마이크로 컴퓨터(40)로 부터 NEAR신호가 하이레벨로 출력되면 트랜지스터(TR6)의 동작에 의해 트랜지스터(TR5, TR7)가 전류경로를 제공하여 모터(M)가 구동되므로써 촛점을 가까운 쪽으로 이동시키고, 마이크로 컴퓨터(40)로 부터 FAR신호가 하이레벨로 출력되면 트랜지스터(TR8)의 동작에 의해 트랜지스터(TR4, TR9)가 전류경로를 제공하여 모터(M)가 촛점을 먼 쪽으로 이동시키도록 구동된다.When the NEAR signal is output from the microcomputer 40 at a high level, the transistors TR5 and TR7 provide a current path by the operation of the transistor TR6 to move the focus to a nearer direction by driving the motor M. When the FAR signal is output from the computer 40 at a high level, the transistors TR4 and TR9 provide a current path by the operation of the transistor TR8, and the motor M is driven to move the focus farther.
또한 NEAR신호와 FAR신호 모두가 로우레벨이면 이때는 피사체에 촛점이 맞추어진 상태로서 모터(M)는 구동되지 않는다.If both the NEAR signal and the FAR signal are at a low level, the motor M is not driven in a state where the subject is focused.
결국 마이크로 컴퓨터(40)의 LOW출력신호에 의해 모터(M)로 공급되는 전류량을 조절하고, NEAR와 FAR신호에 의해 모터의 구동방향에 따라 렌즈를 이동시키게 된다.As a result, the amount of current supplied to the motor M is controlled by the LOW output signal of the microcomputer 40, and the lens is moved according to the driving direction of the motor by the NEAR and FAR signals.
상기한 바와같은 본 고안 회로는 구조가 간단하여 신뢰도가 높고, 마이크로 컴퓨터의 사용으로 정밀도가 개선되며, 빠른 속도로 자동촛점을 조절하기 때문에 고화질 및 고속의 촛점조절을 행할 수 있는 이점이 있다.The circuit of the present invention as described above is simple in structure, high in reliability, precision is improved by using a microcomputer, and high-speed and high-speed focusing can be performed because the automatic focusing is controlled at a high speed.
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KR2019890002030U KR920004222Y1 (en) | 1989-02-27 | 1989-02-27 | Auto focus controlling circuit for a video camera |
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KR2019890002030U KR920004222Y1 (en) | 1989-02-27 | 1989-02-27 | Auto focus controlling circuit for a video camera |
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KR900016057U KR900016057U (en) | 1990-09-03 |
KR920004222Y1 true KR920004222Y1 (en) | 1992-06-22 |
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KR2019890002030U KR920004222Y1 (en) | 1989-02-27 | 1989-02-27 | Auto focus controlling circuit for a video camera |
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