KR890001454B1 - Auto focus system - Google Patents

Auto focus system Download PDF

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Publication number
KR890001454B1
KR890001454B1 KR8201605A KR820001005A KR890001454B1 KR 890001454 B1 KR890001454 B1 KR 890001454B1 KR 8201605 A KR8201605 A KR 8201605A KR 820001005 A KR820001005 A KR 820001005A KR 890001454 B1 KR890001454 B1 KR 890001454B1
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South Korea
Prior art keywords
lens
distance measurement
light source
light receiving
light
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KR8201605A
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Korean (ko)
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KR830009501A (en
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다쓰오 이노우에
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이와마 가즈오
쏘니 가부시기가이샤
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    • 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
    • G02B7/282—Autofocusing of zoom lenses
    • 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

Abstract

내용 없음.No content.

Description

초점 조절장치Focusing device

제 1 도는 종래의 장치의 구성도.1 is a block diagram of a conventional apparatus.

제 2 도는 그 설명도.2 is an explanatory diagram thereof.

제 3 도는 본원 발명의 일예의 구성도.3 is a block diagram of an example of the present invention.

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

1 : 촬영렌즈 2 : 핀트면1: shooting lens 2: focus surface

3 : 구동부 4 : 광원부3: drive unit 4: light source unit

5 : 수광부 6 : 피사체5: light receiver 6: subject

7 : 신호 처리회로 8 : 줌 계7: signal processing circuit 8: zoom meter

9 : 하프미러9: half mirror

본원 발명은 예를 들면 줌렌즈(zoom lens)를 가진 텔레비전 카메라에 사용해서 적합한 자동초점 조절장치에 관한 것이다.The present invention relates to an autofocus control device suitable for use, for example, in a television camera with a zoom lens.

이와 같은 자동초점 조절장치로서 제 1 도에 나타낸 바와 같은 것이 있다. 도면에 있어서, (1)은 촬영렌즈, (2)는 그 핀트면을 나타낸다. 또, 렌즈(1)에는 초점 조절기구가 설치되며, 이 기구는 구동부(3)로 구동된다. 그리고, 거리 측정용의 광원부(4)와 수광부(5)가 설치된다. 그리고, 광원부(4)로부터는 예를 들면 적외선 빔이 렌즈(1)의 광축과 평행으로 조사되는 동시에, 수광부(5)의 수광방향이 광원부(4)로부터의 빔과 렌즈(1)의 광축이 포함되는 평면에 따라서 변화되며, 광원부(4)로부터의 빔이 피사체(6)에 닿아서 반사된 빛이 검출이 행해진다. 이 검출신호가 신호 처리회로(7)에 공급되어서 거리측정이 행해진다.As such an automatic focusing device, there is one as shown in FIG. In the figure, reference numeral 1 denotes a photographing lens, and numeral 2 denotes a focusing surface thereof. The lens 1 is provided with a focus adjusting mechanism, which is driven by the drive unit 3. And the light source part 4 and the light receiving part 5 for distance measurement are provided. Then, for example, an infrared beam is irradiated from the light source unit 4 in parallel with the optical axis of the lens 1, and the light receiving direction of the light receiving unit 5 is the beam from the light source unit 4 and the optical axis of the lens 1. It changes according to the plane included, and the light reflected by the beam from the light source part 4 hitting the subject 6 is detected. This detection signal is supplied to the signal processing circuit 7 and distance measurement is performed.

즉, 거리측정을 할 시점에 있어서 신호 처리회로(7)로부터의 신호에 의해 광원부(4)가 발광되며, 그와 동시에 수광부(5)의 수광방향이 렌즈(1)의 광축 및 광원부(4)로부터의 빔과 평행인 방향에서, 안쪽을 향해서 서서히 변한다. 그리고, 피사체(6)로부터의 반사광이 검출된 시점에 있어서, 수광방향의 각도에 대응한 검출신호가 처리회로(7)에 공급되며, 피사체까지의 거리가 측정된다.That is, the light source unit 4 emits light by the signal from the signal processing circuit 7 at the time of the distance measurement, and at the same time, the light receiving direction of the light receiving unit 5 is the optical axis of the lens 1 and the light source unit 4. In a direction parallel to the beam from, it gradually changes inward. When the reflected light from the subject 6 is detected, a detection signal corresponding to the angle in the light receiving direction is supplied to the processing circuit 7, and the distance to the subject is measured.

이 측정된 거리에 대응하는 신호가 구동부(3)에 공급되어서, 렌즈(1)의 초점이 조절된다.A signal corresponding to this measured distance is supplied to the driver 3 so that the focus of the lens 1 is adjusted.

그런데, 이 장치에 있어서 렌즈(1)와 거리측정용의 광원부(4) 및 수광부(5)와의 광학계가 완전히 독립되어 있기 때문에, 예를 들면 줌렌즈를 사용하고 있을 경우에, 망원과 광각으로 렌즈의 사야가 변해도 거리측정 범위는 변화하지 않는다.By the way, in this apparatus, since the optical system between the lens 1, the light source part 4 for distance measurement, and the light receiving part 5 is completely independent, for example, when a zoom lens is used, Even if the field changes, the range does not change.

즉, 제 2 도에 있어서 제2(a)도는 예를 들면 줌렌즈를 표준으로 사용한 경우로서, 피사체(6)가 도면과 같이 찍히며, 이때의 거리측정 범위가 파선으로 표시되는 것으로 한다. 이에 대해서 제 2(b)도는 망원으로 사용한 경우이며, 피사체(6)가 도시한 바와 같이 확대된다. 그리고, 이때 거리측정 범위는 피사체(6)에 대해서일정한 범위이며, 피사체(6)가 확대됨으로써 1점쇄선으로 나타낸 바와 같이 시야의 대부분의 부분에 확대되어 버린다. 또, 제 2(c)도는 광각으로 사용한 경우이며, 피사체(6)가 도면과 같이 축소되는 동시에, 거리측정 범위(2점쇄선 도시)도 좁아진다.That is, in FIG. 2, FIG. 2 (a) is a case where a zoom lens is used as a standard, for example, and the subject 6 is taken as shown in the drawing, and the distance measurement range at this time is indicated by a broken line. On the other hand, FIG. 2 (b) shows a case where the telephoto device is used for telephoto, and the subject 6 is enlarged as shown. At this time, the distance measuring range is a constant range with respect to the subject 6, and as the subject 6 is enlarged, it is enlarged to most parts of the field of view as indicated by the dashed-dotted line. In addition, FIG. 2 (c) shows the case of using a wide angle, and the subject 6 is reduced as shown in the drawing, and the distance measurement range (shown by the dashed-dotted line) is also narrowed.

그러나, 이 경우에 사용자는 거리측정 범위가 고정(파선 도시)된 것이라고 판단하여 조작을 해버린다. 이때문에, 예를 들면 망원에서는 제 2(b)도의 파선 안쪽에 피사체(6)를 포착해도, 파선과 일점쇄선의 사이에 다른 피사체가 있으면, 그곳에서 초점조절이 행해져 버릴 염려가 있다. 이것은 특히 인물등의 둥그스름한 피사체의 경우에, 목적으로 하는 부분의 주위에서 초점조절이 행해져 버려 목적부분에 초점이 맞지 않게되어 버린다. 또, 광각에서는 제 2(c)도의 파선의 안쪽에 피사체(6)를 포착해도, 그것이 2점쇄선의 바깥쪽일 경우에는 초점조절이 이루어지지 않을 염려도 있다.However, in this case, the user judges that the distance measuring range is fixed (broken line) and operates. For this reason, for example, in the telephoto, even if the subject 6 is captured inside the broken line of FIG. 2 (b), if there is another subject between the dashed line and the dashed-dotted line, there exists a possibility that focus adjustment may be performed there. This is especially the case in the case of round subjects such as people, and the focusing is performed around the target portion, and the target portion becomes out of focus. Moreover, even if the subject 6 is captured inside the dashed line in FIG. 2C at a wide angle, the focus may not be adjusted if it is outside the dashed-dotted line.

그러나, 이 경우에 망원으로는 초점조절을 정확히 맞출 필요가 있는 것에 반해, 광각에서는 초점조절은 비교적 부정확대도 된다. 즉, 상술한 장치의 경우 특히 정밀도가 필요한 망원에 있어서 거리측정의 정밀도가 나빠지고 있다.In this case, however, the focusing needs to be precisely adjusted by telephoto, whereas the focusing may be relatively inaccurate at a wide angle. That is, in the case of the above-mentioned device, the accuracy of distance measurement is deteriorating, especially in the telephoto which requires precision.

본원 발명은 이와 같은 점을 감안하여, 간단히 구성으로 살술한 바와 같은 거리측정 범위의 변화가 생기지 않도록 한 것이다. 다음에, 도면을 참조하면서 본원 발명의 일실시예에 대해 설명한다.In view of such a point, the present invention simply prevents a change in the range of measurement as described in the simple configuration. Next, an embodiment of the present invention will be described with reference to the drawings.

제 3 도에 있어서, 촬영렌즈(1)에 줌 계(8)가 설치된다. 도면의 예에서는 줌 계(8)는 오목렌지(8a)와 볼록렌즈(8b)로 이루어지며, 오목렌즈(8a)를 볼록렌즈(8b)에 근접시키면 망원, 멀리하면 광각으로 된다. 그리고, 초점조절은 볼록렌즈(1a)를 전후로 움직여서 행해진다. 그리고, 볼록렌즈(1b)는 고정되어 있다.3, the zoom system 8 is provided in the photographing lens 1. In the example of the figure, the zoom system 8 consists of the concave lens 8a and the convex lens 8b, and when the concave lens 8a is brought close to the convex lens 8b, it becomes a telephoto and a wide angle when it is far away. The focus adjustment is performed by moving the convex lens 1a forward and backward. The convex lens 1b is fixed.

이들 줌 계(8)와 렌즈(1b)와의 상이에 렌즈 계의 광축에 대해서 45도의 각도를 가지고 하프미러(half mirror)(9)가 설치된다. 그리고, 렌즈 계의 광축을 하프미러(9)로 반사된 위치에 거리측정용의 수광부(5)가 설치된다. 또, 광원부(4)가 제 1 도의 수광부(5)의 위치에 설치되며, 이 광원부(4)로부터의 빔의 조사(照射)방향이 렌즈(1)의 광축을 포함하는 면에 따라서 변화되도록 한다.A half mirror 9 is provided between the zoom system 8 and the lens 1b at an angle of 45 degrees with respect to the optical axis of the lens system. And the light receiving part 5 for distance measurement is provided in the position which reflected the optical axis of the lens system by the half mirror 9. As shown in FIG. Moreover, the light source part 4 is provided in the position of the light receiving part 5 of FIG. 1, and the irradiation direction of the beam from this light source part 4 changes so that it may change according to the surface containing the optical axis of the lens 1 .

이 장치에 있어서, 거리측정은 다음과 같이 행해진다. 즉, 거리측정을 하 시점에 있어서 신호 처리회로(7)로부터의 신호에 의해 광원부(4)가 발광되는 동시에, 빔의 조사방향이 렌즈(1)의 광축과 평행인 방향으로부터 안쪽으로 향해 서서히 변한다. 그리고, 피사체(6)로부터의 반조광(反照光)이 렌즈(1)로 들어가, 줌계(8)를 통해서, 하프미러(9)로 반사되며, 수광부(5)에 들어간 시점에 있어서, 광원부(4)로부터의 빔의 조사방향의 각도에 대응한 검출신호가 처리회로(7)에 공급되며, 피사체(6)까지의 거리가 측정된다.In this apparatus, distance measurement is performed as follows. That is, at the time point when the distance measurement is performed, the light source unit 4 emits light by the signal from the signal processing circuit 7, and the beam irradiation direction gradually changes inward from the direction parallel to the optical axis of the lens 1. . Then, the semi-illumination light from the subject 6 enters the lens 1, is reflected by the half mirror 9 through the zoom meter 8, and enters the light receiving unit 5 at the time of entering the light receiving unit 5. The detection signal corresponding to the angle of the beam irradiation direction from 4) is supplied to the processing circuit 7, and the distance to the subject 6 is measured.

따라서, 이 장치에 있어서 수광부(5)가 줌 계(8)뒤에 설치되어 있으므로, 여기서 수광되는 범위(거리측정범위)는 줌 계(8)로 확대 또는 축소된 시야에 있어서 소정의 범위로 되며, 망원 및 광각에 있어서의 거리측정 범위가 고정된다. 즉, 제 3 도에 있어서 망원일때는 1점쇄선의 범위에서 거리측정이 행해지며, 광각일때는 2점쇄선의 범위에서 거리측정이 행해지며, 망원일때에 더욱 정확한 거리측정이 행해진다.Therefore, in this apparatus, since the light receiving portion 5 is provided behind the zoom meter 8, the range (distance measuring range) received here becomes a predetermined range in the field of view enlarged or reduced by the zoom meter 8, The range of distance measurement at telephoto and wide angle is fixed. That is, in FIG. 3, distance measurement is carried out in the range of one-dot chain line when telephoto, distance measurement is performed in the range of two-dot chain line when wide-angle, and more accurate distance measurement is performed in telephoto.

이와 같이 거리의 측정이 행해지며, 렌즈(1)의 초점조절이 행해지는 것이지만, 본원 발명에 의하면 망원 및 광각에 있어서도 거리측정 범위가 불변이므로, 사용자가 조작을 잘못할 염려가 없다. 또, 망원에 있어서 더욱 정확한 거리측정이 행해지며, 항상 양호한 초점조절을 할 수 있다.In this way, the distance is measured and the focus adjustment of the lens 1 is performed. However, according to the present invention, since the distance measurement range is invariable even in the telephoto and wide angle, there is no fear that the user will make a mistake. In addition, more accurate distance measurement is performed in the telephoto, and good focus adjustment can be always performed.

또한, 제 1 도의 장치의 경우 광원부(4)로부터의 빔이 렌즈(1)의 광축에서 떨어져 있기 때문에 특히 근거리에 있어서 측정 오차가 생길 염려가 있었지만, 본원 발명에 의하면 수광부(5)의 수광방향이 렌즈(1)의 광축과 일치되어 있으므로, 이와 같은 측정 오차가 생길 염려는 없다.In addition, in the case of the apparatus of FIG. 1, since the beam from the light source unit 4 is separated from the optical axis of the lens 1, there is a concern that measurement errors may occur especially at a short distance, but according to the present invention, the light receiving unit 5 has a light receiving direction Since it coincides with the optical axis of the lens 1, there is no fear that such measurement error will occur.

또, 제 1 도의 장치의 경우 렌즈(1)외에 광원부(4)와 수광부(5)를 설치하므로, 디자인상의 제약이 커졌지만, 본원 발명에 의하면 렌즈(1)외에 광원부(4)를 설치하는 것뿐이므로, 디자이상의 제약도 적어진다.In addition, in the case of the apparatus of FIG. 1, since the light source unit 4 and the light receiving unit 5 are provided in addition to the lens 1, design restrictions are increased, but according to the present invention, the light source unit 4 is provided in addition to the lens 1. As a result, there are fewer constraints than the design.

그리고, 상술한 구성에 있어서, 광원부(4)와 수광부(5)의 배치를 반대로 하여, 광원부(4)를 렌즈(1)내에 설치하도록 해도 된다.In the above-described configuration, the light source unit 4 may be disposed inside the lens 1 with the light source unit 4 and the light receiving unit 5 arranged in reverse.

Claims (1)

줌 계를 갖는 촬영렌즈와, 거리측정용 광원부와, 거리측정용 수광부를 가지며, 상기 렌즈에는 초점 조절기구가 설치되고, 상기 거리측정용 광원부를 발광시켜, 상기 거리측정용 광원부 및 상기 거리측정용 수광부의 어느 한쪽의 각도를 변화시켜 거리측정을 하며, 이 거리측정 출력에 따라서 상기 초점 조절기구를 구동하는 동시에, 상기 거리측정용 광원부 및 상기 거리측정용 수광부의 다른 쪽을 상기 촬영렌즈내의 상기 줌계의 뒤에 배치하도록 한 초점 조절장치.A photographing lens having a zoom system, a light source for distance measurement, and a light receiver for distance measurement, and a focus adjustment mechanism is provided in the lens, and the light source for distance measurement is made to emit light, the light source for distance measurement and the distance measurement. A distance measurement is performed by varying the angle of one of the light receiving sections, and the focusing mechanism is driven in accordance with the distance measuring output, and the other side of the distance measuring light source section and the distance measuring light receiving section is measured in the zoom lens in the photographing lens. Focus control to be placed behind.
KR8201605A 1981-03-17 1982-03-09 Auto focus system KR890001454B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP56038447A JPS57154206A (en) 1981-03-17 1981-03-17 Focusing device
JP81-38447 1981-03-17

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Publication Number Publication Date
KR830009501A KR830009501A (en) 1983-12-21
KR890001454B1 true KR890001454B1 (en) 1989-05-03

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KR8201605A KR890001454B1 (en) 1981-03-17 1982-03-09 Auto focus system

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JP (1) JPS57154206A (en)
KR (1) KR890001454B1 (en)
AT (1) AT376813B (en)
CA (1) CA1173284A (en)
DE (1) DE3209517A1 (en)
FR (1) FR2502354B1 (en)
GB (1) GB2095505A (en)
NL (1) NL8201070A (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3310601C2 (en) * 1982-03-24 1994-02-10 Canon Kk Distance measuring device
JPS5995336U (en) * 1982-12-17 1984-06-28 ソニー株式会社 Video camera
JPS606114U (en) * 1983-06-24 1985-01-17 キヤノン株式会社 focus detection device
US4801963A (en) * 1985-12-18 1989-01-31 Canon Kabushiki Kaisha Focus detecting system
US5305047A (en) * 1988-10-11 1994-04-19 Canon Kabushiki Kaisha Pattern projector having a multi-portion projection lens and camera comprising the same
KR102093637B1 (en) * 2017-10-20 2020-03-27 전자부품연구원 Lidar device and system comprising the same

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3759614A (en) * 1971-02-10 1973-09-18 Eastman Kodak Co Dual photocell range finder apparatus
JPS51120725A (en) * 1975-04-16 1976-10-22 Sankyo Kogaku Kogyo Kk Automatic forcusing camera
US4083056A (en) * 1975-09-09 1978-04-04 Asahi Kogaku Kogyo Kabushiki Kaisha Focus detecting device for single-lens reflex cameras
JPS5262022A (en) * 1975-11-17 1977-05-23 Bell & Howell Co Closed loop automatic focusing system
FR2396325A1 (en) * 1977-07-01 1979-01-26 Olympus Optical Co Automatic focussing system for an optical instrument - assesses smoothness of brightness change between scanned adjacent image elements to produce control signal for optical system
JPS54155832A (en) * 1978-05-30 1979-12-08 Canon Inc Focusing detector

Also Published As

Publication number Publication date
FR2502354B1 (en) 1985-06-21
FR2502354A1 (en) 1982-09-24
NL8201070A (en) 1982-10-18
DE3209517A1 (en) 1982-10-14
GB2095505A (en) 1982-09-29
JPH0526176B2 (en) 1993-04-15
JPS57154206A (en) 1982-09-24
ATA102382A (en) 1984-05-15
AT376813B (en) 1985-01-10
KR830009501A (en) 1983-12-21
CA1173284A (en) 1984-08-28

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