KR950005035Y1 - Distance counting apparauts for auto focus camera - Google Patents
Distance counting apparauts for auto focus camera Download PDFInfo
- Publication number
- KR950005035Y1 KR950005035Y1 KR92002026U KR920002026U KR950005035Y1 KR 950005035 Y1 KR950005035 Y1 KR 950005035Y1 KR 92002026 U KR92002026 U KR 92002026U KR 920002026 U KR920002026 U KR 920002026U KR 950005035 Y1 KR950005035 Y1 KR 950005035Y1
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- KR
- South Korea
- Prior art keywords
- circuit
- signal
- auto focus
- division multiplexing
- time division
- Prior art date
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Classifications
-
- 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
- G03B13/18—Focusing aids
- G03B13/20—Rangefinders coupled with focusing arrangements, e.g. adjustment of rangefinder automatically focusing camera
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
- G02B7/30—Systems for automatic generation of focusing signals using parallactic triangle with a base line
- G02B7/32—Systems for automatic generation of focusing signals using parallactic triangle with a base line using active means, e.g. light emitter
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Measurement Of Optical Distance (AREA)
Abstract
내용 없음.No content.
Description
제1도는 종래의 측거장치를 보인 블록다이아그램.1 is a block diagram showing a conventional measuring device.
제2도는 본 고안에 의한 능동형 자동 초점을 위한 측거장치의 블록다이아그램.2 is a block diagram of a rangefinder for active autofocus according to the present invention.
제3도는 본 고안의 상세회로도.3 is a detailed circuit diagram of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 수광소자 2 : 프리엠프1: light receiving element 2: preamp
3 : 헤드엠프 4 : 시분할 다중화 회로부3: head amplifier 4: time division multiplexing circuit
5 : 동기검출부 6 : 적분회로5: synchronous detection part 6: integrating circuit
7 : A/D변환 및 마이콤7: A / D conversion and micom
본 고안은 투광소자를 이용하여 대상물을 향해 빛을 조사시켜 대상물에 반사되어 나오는 빛을 이용하여 거리를 측정한 자동 초점 카메라등에 사용되는 측거장치에 관한 것으로서, 특히 회로규모를 축소시킬 수 있고 측거정밀도를 일층 향상시킬 수 있도록 한 능동형 자동 초점장치를 위한 측거장치에 관한 것이다.The present invention relates to a measuring device used in an auto focus camera that measures a distance by using light emitted from a light emitting element to reflect an object, and uses the light reflected from the object. In particular, the circuit size can be reduced and the measurement accuracy can be reduced. The present invention relates to a measuring device for an active auto focus device that can further improve the performance of the present invention.
종래의 측거장치는 제1도에 도시된 바와 같이 원거리면에서 투광소자와 수광소자를 이용하여 거리를 측정한다는 점에서 본 고안과 일치하나 수광부에 수광된 빛이 제1도에 도시된 각각의 연산회로를 거치는 동안 주변의 온도나 밝기, 회로소자 특성의 경년변화에 대하여 완전히 대처하는 것은 불가능하며 원리적으로 어느 정도의 측거오차를 내재하게 되는 것이다.Conventional range finder is consistent with the present invention in that the distance is measured by using a light transmitting element and a light receiving element in the far plane as shown in FIG. 1, but the light received by the light receiving portion is calculated for each operation shown in FIG. Throughout the circuit, it is impossible to cope with the aging change of ambient temperature, brightness, and circuit element characteristics, and in principle, there is some measurement error.
아울러, 연산회로의 오프셋(OFFSET), 드리프트(DRIFT)등의 직류잡음이 측거정밀도를 악화시키게 되며, 연산회로에서 오프셋, 드리프트등의 직류잡음을 보정하여 고정밀한 측거값을 얻기 위해서는 전용집적회로를 구성할 수 밖에 없게 되는데, 이는 회로 규모가 너무 크게되어 제품에서 차지하는 상대 체적비가 너무크게 되고 양산비용이 증가하게 되는 문제점이 있는 것이다.In addition, DC noise such as offset and drift of the calculation circuit deteriorates the measurement accuracy, and in order to obtain a high accuracy measurement value by correcting DC noise such as offset and drift in the calculation circuit, a dedicated integrated circuit may be used. There is no choice but to configure, which is a problem that the circuit size becomes so large that the relative volume ratio of the product becomes too large and the mass production cost increases.
본 고안은 상기 문제점을 해결하기 위하여 안출된 것으로서 수광소자로부터 복수신호 처리계(동기검출부, 적분기, 연산회로등)의 앞단계에서 신호를 시분할 다중화시켜 동일 신호 처리회로 즉, 회로의 1계통화로 모든 신호를 처리하는 방식을 사용하여 회로소자의 경년변화에 의한 측거오차를 없애고 또한, 종래의 하드웨어적인 연산처리회로를 마이콤을 이용하여 소프트웨어화 함으로써 회로규모를 대폭 축소하고 양산비용을 절감시킬 수 있으며, 고정밀한 측거장치와 그 장치의 재현성을 추구하는데 그 목적이 있다.The present invention was devised to solve the above problems, and time-division multiplexed signals from the light-receiving element in the preceding stage of the multiple signal processing system (synchronous detection unit, integrator, operation circuit, etc.) to all the same signal processing circuit, that is, one system of the circuit. By using the signal processing method, it eliminates the measurement error caused by the aging change of the circuit element, and by using the microcomputer to convert the conventional computational processing circuit, the circuit size can be drastically reduced and the mass production cost can be reduced. Its purpose is to pursue a high-precision measuring device and its reproducibility.
이를 첨부된 도면에 의하여 상세히 설명하면 다음과 같다.This will be described in detail with reference to the accompanying drawings.
IR LED를 통해 조사된 빛이 대상물에 반사되어 수광소자(1)를 통해 입사되고, 프리엠프(2) 및 헤드앰프(3)를 거쳐 출력되는 공지의 것에 있어서, 상기 헤드엠프(3)를 통해 출력되는 R, L 신호를 시분할 다중화 시키는 시분할 다중화 회로부(4)와 동기신호를 검출하기 위한 동기검출부(5) 그리고 적분회로(6)와 A/D변환 및 마이콤(7)을 순차 연결하여서 된 것이다.The light irradiated through the IR LED is reflected on the object and incident through the light receiving element 1, and is output through the preamplifier 2 and the head amplifier 3, through the head amplifier 3. The time division multiplexing circuit section 4 for time division multiplexing the output R and L signals, the synchronous detection section 5 for detecting the synchronization signal, the integrating circuit 6 and the A / D conversion and the microcomputer 7 are sequentially connected. .
이와같이 구성된 본 고안의 작용효과를 살펴보면 다음과 같다.Looking at the effect of the present invention configured as described above are as follows.
본 고안은 광조형(光照型)삼각 측거방식으로 투광소자인 IR FED를 이용하여 대상물을 향해 약 10㎑ 변조광의 빛을 조사시키면 이는 대상물에 반사되어 일정거리 또는 가변의 거리에 있는 수광소자(1)에 입사된다. 이 수광소자(1)를 통해 출력되는 R(Ringht)신호 및 L(Left)신호는 프리엠프(2)를 거쳐 I-V변환 및 외광영향 즉, DC성분을 제거하게 되고, 헤드엠프(3)를 통해 신호를 증폭시키고 위상을 보정하게 된다.The present invention is a light shaping triangulation method by irradiating light of about 10 조사 modulated light toward an object using IR FED, which is a light transmitting element, which is reflected on the object and is at a certain distance or a variable distance (1). ) Is incident. The R (Ringht) signal and the L (Left) signal outputted through the light receiving element 1 remove the IV conversion and external light influence, that is, the DC component through the preamp 2, and through the head amp 3. Amplify the signal and correct the phase.
헤드엠프(3)에서 증폭된 각각의 신호는 시분할 다중화 회로부(4)에 입력되고 여기에 입력된 각 신호는 다중화되어 동일신호로 처리하게 되며 동기검출부(5)를 통해 동기를 검출하게 된다.Each signal amplified by the head amplifier 3 is input to the time division multiplexing circuit section 4, and each of the signals input thereto is multiplexed to be processed as the same signal, and the synchronization is detected by the synchronization detector 5.
동기검출부(5)를 통해 출력된 신호는 적분회로(6)를 거쳐 적분되고, 적분된 신호는 A/D변환 및 마이콤(7)을 통해 연산 및 비교하여 대상물의 거리를 측정하게 된다.The signal output through the synchronous detection unit 5 is integrated through the integrating circuit 6, and the integrated signal is calculated and compared through the A / D conversion and the microcomputer 7 to measure the distance of the object.
따라서, 본 고안은 회로구성을 1계통과함으로써 온도등의 주위환경에 의한 변화를 최소화하여 회로의 신뢰성을 향상시킬 수 있고 아울러 회로규모를 축소할 수 있으며, 종래의 연산회로를 통한 하드웨어 구성을 마이콤을 이용하여 소프트 웨어로 처리함으로써 회로소자의 경년변화에 의한 측거오차를 없앨 수 있도록 고안된 것이다.Therefore, the present invention can improve the reliability of the circuit by minimizing changes caused by the surrounding environment such as temperature by passing one circuit configuration, and can reduce the size of the circuit. It is designed to eliminate the measurement error caused by the secular variation of the circuit element by processing the software using
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR92002026U KR950005035Y1 (en) | 1992-02-12 | 1992-02-12 | Distance counting apparauts for auto focus camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR92002026U KR950005035Y1 (en) | 1992-02-12 | 1992-02-12 | Distance counting apparauts for auto focus camera |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR930020200U KR930020200U (en) | 1993-09-24 |
| KR950005035Y1 true KR950005035Y1 (en) | 1995-06-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR92002026U KR950005035Y1 (en) | 1992-02-12 | 1992-02-12 | Distance counting apparauts for auto focus camera |
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| Country | Link |
|---|---|
| KR (1) | KR950005035Y1 (en) |
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1992
- 1992-02-12 KR KR92002026U patent/KR950005035Y1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| KR930020200U (en) | 1993-09-24 |
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