JP3359682B2 - Focus detection device - Google Patents
Focus detection deviceInfo
- Publication number
- JP3359682B2 JP3359682B2 JP2413993A JP2413993A JP3359682B2 JP 3359682 B2 JP3359682 B2 JP 3359682B2 JP 2413993 A JP2413993 A JP 2413993A JP 2413993 A JP2413993 A JP 2413993A JP 3359682 B2 JP3359682 B2 JP 3359682B2
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- Japan
- Prior art keywords
- light
- focus detection
- lens
- detection device
- reflection
- Prior art date
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- Automatic Focus Adjustment (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、カメラの焦点検出装置
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera focus detecting device.
【０００２】[0002]
【従来の技術】撮影レンズによって形成される像を再結
像光学系により二つに分割して光電変換素子列（受光素
子列）上に再形成し、その二像の位置ずれを検出するこ
とによって合焦検出を行う焦点検出光学系は、これまで
に数多く提案されており、例えば特開昭５５−１１８０
１９号公報，特開昭５８−１０６５１１号公報及び特開
昭６０−３２０１２号公報に記載のものがある。かかる
焦点検出光学系における、測距範囲の広さと合焦精度と
の関係は以下のようになる。2. Description of the Related Art An image formed by a photographing lens is divided into two by a re-imaging optical system and is re-formed on a photoelectric conversion element array (light-receiving element array) to detect a displacement of the two images. Many focus detection optical systems for performing focus detection by using the conventional method have been proposed.
19, JP-A-58-106511 and JP-A-60-32012. The relationship between the range of the distance measurement range and the focusing accuracy in such a focus detection optical system is as follows.
【０００３】即ち、受光素子列の各受光素子は通常等間
隔で配列しているが、その間隔を１ピッチとすると、合
焦精度は１ピッチに対する相対尺度として表される。合
焦精度を１ピッチのＭ分の１（Ｍは定数）とし、像面に
おける１ピッチあたりのデフォーカス量をαとすると、
像面における合焦精度Δは、 Δ ＝ ±（１／Ｍ）・α （１） である。ここで、Δが大きいほど合焦精度は悪く、Δが
小さいほど合焦精度は良い。また、受光素子の数をＮ個
とすると、像面における測距可能なデフォーカス範囲Σ
は、 Σ ＝ ｜±Ｎ・α｜ （２） である。ここで、αを大きくすると測距範囲Σは大きく
なるが、合焦精度Δは劣化する。これとは逆に、αを小
さくすると合焦精度Δは良くなるが、測距範囲Σは小さ
くなってしまう。つまり、合焦精度Δを劣化させず且つ
測距範囲Σを大きくするには、受光素子数Ｎを大きくす
れば良いことがわかる。[0003] That is, the light receiving elements of the light receiving element row are usually arranged at equal intervals. If the interval is one pitch, the focusing accuracy is expressed as a relative measure for one pitch. If the focusing accuracy is 1 / M of one pitch (M is a constant) and the defocus amount per pitch on the image plane is α,
The focusing accuracy Δ on the image plane is as follows: Δ = ± (1 / M) · α (1) Here, the larger the Δ, the lower the focusing accuracy, and the smaller the Δ, the better the focusing accuracy. If the number of light receiving elements is N, a defocus range that can be measured on the image plane is given by
Is Σ = | ± N · α | (2). Here, if α is increased, the distance measurement range Σ increases, but the focusing accuracy Δ deteriorates. Conversely, when α is reduced, the focusing accuracy Δ is improved, but the distance measurement range Σ is reduced. That is, it can be seen that the number N of light receiving elements may be increased in order to increase the distance measurement range ず without deteriorating the focusing accuracy Δ.
【０００４】しかし、受光素子数Ｎが大きいと、受光素
子列の全長が長くなり、構造上の不都合を生じさせる。
図５は、上述の関係を有する焦点検出光学系の一例を示
しており、図中、１は撮影レンズ、２は予定結像面、３
はコンデンサレンズ、５は開口５ａ，５ｂを有する明る
さ絞り、６ａ，６ｂは再結像レンズ、７ａ，７ｂは受光
素子列、Ｏはコンデンサレンズ３の光軸である。図５よ
り明らかなように、実線で示す長さの受光素子列７ａ，
７ｂの受光素子の数を増やした場合、夫々の受光素子列
は点線で示す長さまで全長が伸長し、斜線で示す部分で
は受光素子列同士が干渉し、焦点検出光学系が構成でき
なくなる。そして、受光素子列同士が干渉しないよう
に、受光素子列７ａ，７ｂの夫々の中心Ｃ7a，Ｃ7bの間
隔Ｌを拡げると焦点検出光学系自体の大型化を余儀なく
される。[0004] However, when the number N of light receiving elements is large, the entire length of the light receiving element row becomes long, which causes structural inconvenience.
FIG. 5 shows an example of a focus detection optical system having the above-mentioned relationship.
Is a condenser lens, 5 is a brightness stop having openings 5a and 5b, 6a and 6b are re-imaging lenses, 7a and 7b are light receiving element arrays, and O is an optical axis of the condenser lens 3. As is clear from FIG. 5, the light receiving element rows 7a, 7a,
When the number of light receiving elements 7b is increased, the entire length of each light receiving element row extends to the length indicated by the dotted line, and the light receiving element rows interfere with each other at the portion indicated by the diagonal lines, so that a focus detection optical system cannot be configured. If the distance L between the centers C 7a and C 7b of the light receiving element rows 7a and 7b is increased so that the light receiving element rows do not interfere with each other, the size of the focus detection optical system itself must be increased.
【０００５】このような、全体の構造をコンパクトに保
ちつつ、測距範囲を拡大し且つ合焦精度を向上させると
いう要請を満足する焦点検出光学系としては、例えば特
開昭５２−９５２２１号公報，特開昭５９−４２５０７
号公報及び特開平２−２５３２２２号公報に記載のもの
がある。図６及び図７は、夫々特開平２−２５３２２２
号公報に記載の焦点検出光学系の概略構成を示す図及び
その斜視図である。図中、８ａ，８ｂはコンデンサレン
ズ３と明るさ絞り５の開口５ａ，５ｂで決定される焦点
検出光学系の入射瞳、また、図６中の受光素子列７ａ，
７ｂはその長手方向が紙面に対して垂直となるように配
置されている。Japanese Patent Laid-Open Publication No. 52-95221 discloses a focus detection optical system which satisfies the demands for expanding the distance measurement range and improving the focusing accuracy while keeping the entire structure compact. And JP-A-59-42507.
And JP-A-2-253222. FIG. 6 and FIG.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a schematic configuration of a focus detection optical system described in Japanese Patent Application Laid-Open Publication No. H10-260, and its perspective view. In the figure, 8a and 8b are entrance pupils of the focus detecting optical system determined by the condenser lens 3 and the apertures 5a and 5b of the brightness stop 5, and the light receiving element rows 7a and 7b in FIG.
7b is arranged so that its longitudinal direction is perpendicular to the paper surface.
【０００６】図において、合焦すべき物体を発した光束
は、撮影レンズ１を通過して予定結像面２に達し、撮影
レンズ１が合焦状態の場合、予定結像面２上に結像す
る。予定結像面２を通過した光束はコンデンサレンズ３
で瞳をリレーされ、明るさ絞り５の開口５ａ，５ｂを通
過して再結像レンズ６ａ，６ｂに入射する。再結像レン
ズ６ａ，６ｂは、その面頂が夫々光軸Ｏと予定結像面２
に結像する入射瞳８ａ，８ｂの夫々の主光線とを含む図
示されない平面（図６において光軸Ｏを含む紙面に対し
て垂直な平面）に関し対称となる位置に配置されてお
り、これら再結像レンズ６ａ，６ｂに入射した光束は、
同じく図示されない平面に関して対称となる位置に平行
に配置された受光素子列７ａ，７ｂに導かれるようにな
っている。このように構成することにより、焦点検出光
学系を大きくすることなく、受光素子列の全長を長くす
ることができる。In FIG. 1, a light beam emitted from an object to be focused passes through a photographing lens 1 and reaches a planned image forming plane 2. When the photographing lens 1 is in a focused state, the light flux forms on the planned image forming plane 2. Image. The light beam that has passed through the predetermined imaging plane 2 is
, The pupil is relayed, passes through the apertures 5a and 5b of the aperture stop 5, and enters the re-imaging lenses 6a and 6b. The tops of the re-imaging lenses 6a and 6b have the optical axis O and the expected imaging plane 2 respectively.
6 are arranged symmetrically with respect to a plane (not shown) including the respective principal rays of the entrance pupils 8a and 8b (a plane perpendicular to the paper plane including the optical axis O in FIG. 6). The luminous flux incident on the imaging lenses 6a and 6b is
Similarly, the light is guided to light receiving element rows 7a and 7b arranged in parallel to positions symmetric with respect to a plane (not shown). With this configuration, the entire length of the light receiving element row can be increased without increasing the size of the focus detection optical system.
【０００７】[0007]
【発明が解決しようとする課題】然し乍ら、図６及び図
７に示す構成では、瞳の分割方向に垂直な成分で二つの
光束が受ける屈折作用が異なり、また、光束が再結像レ
ンズの光軸外から入射するため収差が発生し易くなると
共に、受光素子列の伸長化に伴って収差補正範囲が拡が
り、かかる収差の補正が困難になるという問題があっ
た。この場合、特に重要な測距範囲の中心の収差が異な
ると、これが合焦精度の劣化要因となり、却って合焦精
度を劣化させてしまうという問題があった。また、合焦
精度の劣化要因は、この他にも、部品の製作誤差、組立
誤差、位相差の算出誤差等があるが、上記従来技術の構
成ではこれらの要因を少なくする或いは抑えることはで
きなかった。However, in the arrangements shown in FIGS. 6 and 7, the refraction effect of the two light beams on the component perpendicular to the pupil division direction is different, and the light beams are reflected by the re-imaging lens. There is a problem that aberration is easily generated because the light is incident from off-axis, and the aberration correction range is expanded with the extension of the light receiving element array, making it difficult to correct such aberration. In this case, if the aberration at the center of the particularly important distance measurement range is different, this becomes a factor of deteriorating the focusing accuracy, and on the contrary, there is a problem that the focusing accuracy is degraded. In addition, other causes of the deterioration of the focusing accuracy include a part manufacturing error, an assembly error, a phase difference calculation error, and the like. However, with the configuration of the related art, these factors cannot be reduced or suppressed. Did not.
【０００８】本発明は、従来の技術の有するこのような
問題点に鑑みてなされたものであり、その目的とすると
ころは、測距範囲の拡大と合焦精度の向上の両方を同時
に満足し、且つ構造がコンパクトな焦点検出装置を提供
することにある。The present invention has been made in view of such problems of the prior art, and has as its object to satisfy both the expansion of the distance measurement range and the improvement of focusing accuracy at the same time. Another object of the present invention is to provide a focus detection device having a compact structure.
【０００９】[0009]
【課題を解決するための手段及び作用】本発明の焦点検
出装置は、合焦精度を確保し得る間隔を以て並ぶ複数の
入射瞳を有する焦点検出光学系が、撮影レンズの予定結
像面の近傍に設置されたコンデンサレンズと、複数の開
口部を有する明るさ絞りと、コンデンサレンズと明るさ
絞りとの間に設置されていて上記開口部に対応した反射
面を有する反射部材と、再結像レンズと、上記開口部の
各々に対応して並設された複数の受光素子列からなる光
電変換手段とから構成されていて、撮影レンズの異なる
領域を通過した複数の光束を反射部材，明るさ絞り及び
再結像レンズを介して光電変換手段で受け、光電変換手
段の受光面の光強度分布から上記複数の光束の位相差を
検出することにより焦点検出を行うようにした焦点検出
装置において、反射部材の反射面のうち少なくとも一つ
は、他の少なくとも一つの反射面とは異なる平面上に，
即ち同一の面でないように、設けられていて、互いの反
射面に対応する上記受光素子列の長手方向を該素子列の
長手方向と直交する方向に並設させ、且つ、反射光どう
しの間隔から上記コンデンサレンズからの入射光軸を外
すように反射光を反射させるべく、入射光に対する反射
光の方向を他の少なくとも一つの反射面とは異ならせる
ようにしたことを特徴としてなるものである。According to the focus detecting apparatus of the present invention, a focus detecting optical system having a plurality of entrance pupils arranged at intervals capable of securing focusing accuracy is provided near a predetermined image forming plane of a photographing lens. A condenser lens, a brightness stop having a plurality of openings, a reflection member provided between the condenser lens and the brightness stop and having a reflection surface corresponding to the opening, and re-imaging. A plurality of light-receiving elements arranged in parallel with each other in correspondence with each of the apertures; In a focus detection device, which is received by a photoelectric conversion unit through a diaphragm and a re-imaging lens, and performs focus detection by detecting a phase difference between the plurality of light beams from a light intensity distribution of a light receiving surface of the photoelectric conversion unit, Anti At least one of the reflecting surface of the member, on a different plane from the other of the at least one reflecting surface,
That is, as not identical plane, and provided, is arranged in the longitudinal direction of the light receiving element arrays corresponding to the reflection surface of each other in a direction perpendicular to the <br/> longitudinal direction of the device rows, and, reflecting In order to reflect the reflected light so as to deviate the incident optical axis from the condenser lens from the interval between the lights, the direction of the reflected light with respect to the incident light is made different from at least one other reflecting surface. It becomes.
【００１０】上記構成によれば、先ず、合焦すべき物体
から発した光束は、撮影レンズで結像作用を受けて予定
結像面を通過する。このとき、光束は、見かけ上合焦精
度を確保し得る間隔を以て並ぶ複数の焦点検出光学系の
入射瞳を通過している。また、撮影レンズが合焦状態に
あれば予定結像面に結像する。更にこの光束は、コンデ
ンサレンズより瞳の伝達作用を受けた後、反射部材で反
射して光路を変え、明るさ絞りに達する。反射部材の反
射面のうち少なくとも一つは、他の反射面とは異なる平
面上に設けられているので、同一物点を発して各明るさ
絞りの中心に導かれる光束は、各明るさ絞り毎に異なる
光路の傾きを持つことになる。そして、夫々の明るさ絞
りを通過した光束は、再結像レンズで結像作用を受け、
受光素子列に導かれる。According to the above arrangement, first, the light beam emitted from the object to be focused is subjected to the image forming operation by the photographing lens and passes through the predetermined image forming plane. At this time, the luminous flux has passed through the entrance pupils of a plurality of focus detection optical systems arranged with an interval capable of securing apparent focusing accuracy. If the photographing lens is in focus, an image is formed on a predetermined image plane. Further, this light beam is transmitted by the pupil from the condenser lens, and then reflected by the reflecting member to change the optical path and reach the aperture stop. Since at least one of the reflecting surfaces of the reflecting member is provided on a plane different from the other reflecting surfaces, the luminous flux that emits the same object point and is guided to the center of each of the aperture stops is provided by each of the aperture stops. Each will have a different optical path slope. Then, the luminous flux passing through each of the aperture stops is subjected to an image forming action by the re-imaging lens,
It is led to the light receiving element row.
【００１１】従って、夫々の反射面の反射光路上に、各
明るさ絞りに対応させて再結像レンズを夫々配置すれ
ば、瞳の分割方向に垂直な成分での夫々の光束が受ける
屈折作用をほぼ同じにすることができ、収差の発生を抑
えることができる。また、夫々の明るさ絞りを通過した
光束に同一入射面で対応する一つの再結像レンズを設置
すれば、複数の再結像レンズで構成した場合に問題とな
る、再結像レンズの配置間隔の精度による組立誤差や、
再結像レンズ個々の性能のバラツキ等の、製作誤差に起
因する合焦精度劣化要因を少なくすることができる。Therefore, if the re-imaging lenses are respectively arranged on the reflection optical paths of the respective reflecting surfaces so as to correspond to the respective aperture stops, the refraction effect received by the respective light beams in the component perpendicular to the pupil dividing direction is obtained. Can be made substantially the same, and the occurrence of aberration can be suppressed. Also, if one re-imaging lens corresponding to the light beam passing through each of the aperture stops is installed on the same incident surface, the arrangement of the re-imaging lens becomes a problem when it is configured with a plurality of re-imaging lenses. Assembly errors due to spacing accuracy,
Factors that degrade the focusing accuracy due to manufacturing errors, such as variations in the performance of individual re-imaging lenses, can be reduced.
【００１２】明るさ絞りに対応して並設される複数の受
光素子列は、同一平面上に夫々配置すると一つのチップ
上で構成され得、製作コスト上及び検出精度上好まし
い。更に、反射部材と明るさ絞りを一体的に構成するこ
とにより、組立精度が向上され得、好ましい。尚、反射
面の傾きを異ならせた反射部材の代わりにプリズムを用
いる方法も考えられるが、この場合、瞳の分割方向に垂
直な成分での各光束が受けるプリズムの屈折作用が異な
り、また夫々のプリズムの製作及び組立誤差が合焦精度
に影響するので好ましくない。A plurality of light receiving element rows arranged in parallel corresponding to the aperture stop can be formed on one chip by arranging them on the same plane, which is preferable in terms of manufacturing cost and detection accuracy. Further, by integrally forming the reflection member and the aperture stop, the assembling accuracy can be improved, which is preferable. Incidentally, a method of using a prism instead of a reflecting member having a different inclination of the reflecting surface is also conceivable. It is not preferable because errors in manufacturing and assembling the prism affect focusing accuracy.
【００１３】[0013]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。第１実施例 図１は本実施例の焦点検出装置を底部に配置した一眼レ
フカメラの略断面図、図２は図１の要部拡大図である。
図において、本実施例の焦点検出装置は、撮影レンズ１
１の予定結像面１２の近傍に設置されたコンデンサレン
ズ１３と、平面反射面を有し該反射面の反射角度を互い
に異ならせてコンデンサレンズ１３の後方に夫々配置さ
れた反射部材１４ａ，１４ｂと、開口部を有し反射部材
１４ａ，１４ｂの後方に夫々配置された明るさ絞り１５
ａ，１５ｂと、予定結像面１２の中心を通り反射部材１
４ａ，１４ｂを反射して明るさ絞り１５ａ，１５ｂの開
口部中心を通る光束とほぼ光軸を一致させて夫々配置さ
れた再結像レンズ１６ａ，１６ｂと、再結像レンズ１６
ａ，１６ｂを射出した光束の結像位置付近に夫々配置さ
れた受光素子列１７ａ，１７ｂとから構成されている。
明るさ絞り１５ａ，１５ｂはその開口部の中心を通る光
束に対して各開口面が垂直となるように夫々配置されて
おり、また、かかる明るさ絞り１５ａ，１５ｂ、反射部
材１４ａ，１４ｂ及び再結像レンズ１６ａ，１６ｂの夫
々の部材は、図において紙面と垂直な方向に並設されて
いる。また、受光素子列１７ａ，１７ｂはその長手方向
が紙面に対して垂直となるように配置されている。１８
はクイックリターンミラー、１９はサブミラーである。Embodiments of the present invention will be described below with reference to the drawings. First Embodiment FIG. 1 is a schematic cross-sectional view of a single-lens reflex camera in which a focus detection device of the present embodiment is disposed at the bottom, and FIG. 2 is an enlarged view of a main part of FIG.
In the figure, a focus detection device of the present embodiment includes a photographing lens 1
And a reflecting member 14a, 14b having a planar reflecting surface and different reflecting angles of the reflecting surface and disposed behind the condenser lens 13, respectively. And aperture stop 15 having an opening and arranged behind reflective members 14a and 14b, respectively.
a, 15b, and the reflection member 1
The re-imaging lenses 16a, 16b and the re-imaging lens 16 are arranged so that their optical axes are substantially coincident with the luminous flux reflecting the light beams 4a, 14b and passing through the centers of the apertures 15a, 15b.
The light receiving element arrays 17a and 17b are respectively arranged near the image forming positions of the light beams emitted from the light emitting elements a and 16b.
The aperture stops 15a and 15b are respectively arranged so that each aperture surface is perpendicular to a light beam passing through the center of the aperture, and the aperture stops 15a and 15b, the reflection members 14a and 14b, and The respective members of the imaging lenses 16a and 16b are juxtaposed in a direction perpendicular to the plane of the drawing in FIG. The light receiving element rows 17a and 17b are arranged so that their longitudinal directions are perpendicular to the paper surface. 18
Is a quick return mirror, and 19 is a sub mirror.
【００１４】上記構成において、合焦すべき物体を発し
た光束は、撮影レンズ１１を通過し、ハーフミラーで構
成されるクイックリターンミラー１８を透過してからサ
ブミラー１９で光路を変え、予定結像面１２に達する。
撮影レンズ１１が合焦状態の場合、予定結像面１２上に
結像する。予定結像面１２を通過した光束は、コンデン
サレンズ１３で瞳をリレーされ、反射部材１４ａ，１４
ｂで反射して光路が変換される。このとき、反射部材１
４ａ，１４ｂの夫々の反射面は、入射光に対する反射光
の方向が異なるように、同一ではない異なった平面上に
夫々設けられているので、かかる反射面に入射する夫々
の光束は異なる方向に反射せしめられ、夫々の反射光路
上に設けられた明るさ絞り１５ａ，１５ｂに達する。従
って、夫々の光束が明るさ絞り１５ａ，１５ｂを通過す
ることにより、コンデンサレンズ１３と明るさ絞り１５
ａ，１５ｂで決定される焦点検出光学系の入射瞳は、合
焦精度を確保し得る間隔を以て並んでいることになる。In the above arrangement, the light beam emitted from the object to be focused passes through the photographing lens 11, passes through the quick return mirror 18 composed of a half mirror, changes the optical path by the sub mirror 19, and forms a predetermined image. The surface 12 is reached.
When the taking lens 11 is in a focused state, an image is formed on a predetermined image forming plane 12. The luminous flux that has passed through the planned image plane 12 is relayed through the pupil by the condenser lens 13 and is reflected by the reflecting members 14a and 14a.
The light path is converted by reflection at b. At this time, the reflection member 1
Since the respective reflection surfaces 4a and 14b are provided on different planes that are not the same so that the directions of the reflected light with respect to the incident light are different, the respective light beams incident on the reflection surfaces are in different directions. The light is reflected and reaches the aperture stops 15a and 15b provided on the respective reflected light paths. Therefore, when the respective light beams pass through the aperture stop 15a, 15b, the condenser lens 13 and the aperture stop 15
The entrance pupils of the focus detection optical system determined by a and 15b are arranged at intervals that can ensure focusing accuracy.
【００１５】明るさ絞り１５ａ，１５ｂを通過した光束
は、再結像レンズ１６ａ，１６ｂに入射するが、このと
き、再結像レンズ１６ａ，１６ｂの光軸は、予定結像面
１２の中心に対応する物点からの光束の主光線とほぼ一
致しているため、かかる再結像レンズ１６ａ，１６ｂよ
り射出する光束の収差の発生は極めて少なく抑えられ
る。更に、再結像レンズ１６ａ，１６ｂを射出した光束
は、その長手方向が互いに平行となるように並設された
受光素子列１７ａ，１７ｂに導かれ、受光素子列１７
ａ，１７ｂにおける夫々の受光面の光強度分布から、図
示されない演算回路により光束の位相差が検出され、撮
影レンズ１１の合焦状態が判別されるようになってい
る。The light beams that have passed through the aperture stops 15a and 15b enter the re-imaging lenses 16a and 16b. At this time, the optical axes of the re-imaging lenses 16a and 16b Since the light beam almost coincides with the principal ray of the light beam from the corresponding object point, the generation of aberration of the light beam emitted from the re-imaging lenses 16a and 16b can be suppressed to an extremely small amount. Further, the light beams emitted from the re-imaging lenses 16a and 16b are guided to light receiving element rows 17a and 17b arranged in parallel so that their longitudinal directions are parallel to each other.
An arithmetic circuit (not shown) detects the phase difference of the luminous flux from the light intensity distributions of the respective light receiving surfaces at a and 17b, and the in-focus state of the photographing lens 11 is determined.
【００１６】本実施例は上述の如く構成されているの
で、反射部材の夫々の反射面を反射した光束の光路は異
なる方向に変換せしめられ、明るさ絞りに対応させ、且
つ各光路上に光軸を一致させて再結像レンズ及び受光素
子列を配置することにより、再結像レンズを射出する光
束の収差の発生を抑えることができると共に、伸長化し
た受光素子列を干渉させることなく配置することができ
る。従って、合焦精度を向上することができると同時
に、測距範囲が拡大され得、而も装置構造をコンパクト
にすることが可能である。この場合、再結像レンズは、
コンデンサレンズ等との収差のバランス上、予定結像面
の中心に対応する物点からの光束の主光線と再結像レン
ズの光軸とを偏心させた方が合焦精度が向上するとき
は、そのように配置しても良い。尚、本実施例では、明
るさ絞りは夫々の開口面が異なる平面上にあるように配
置したが、これらを同一平面上に配置するようにしても
実用上問題はない。In this embodiment, the light paths of the light beams reflected by the respective reflecting surfaces of the reflecting member are converted in different directions, corresponding to the aperture stop, and the light beams are reflected on the respective light paths. By arranging the re-imaging lens and the light receiving element array with the axes aligned, it is possible to suppress the occurrence of aberration of the light beam emitted from the re-imaging lens and to arrange the elongated light receiving element array without causing interference. can do. Therefore, the focusing accuracy can be improved, and at the same time, the range of distance measurement can be expanded, and the device structure can be made compact. In this case, the re-imaging lens
When the focusing accuracy is improved by decentering the principal ray of the light beam from the object point corresponding to the center of the expected imaging plane and the optical axis of the re-imaging lens on the balance of aberrations with the condenser lens and the like. , May be arranged as such. In the present embodiment, the aperture stop is arranged so that the respective aperture surfaces are on different planes. However, there is no practical problem if they are arranged on the same plane.
【００１７】第２実施例 図３は本実施例の焦点検出装置を示す図である。図にお
いて、本実施例の焦点検出装置は、図示されない撮影レ
ンズの予定結像面１２の近傍に設置されたコンデンサレ
ンズ１３と、平面反射面を有し該反射面の反射角度を互
いに異ならせてコンデンサレンズ１３の後方に配置され
た反射部材１４ａ，１４ｂと、開口部を有し反射部材１
４ａ，１４ｂの後方に夫々配置された明るさ絞り１５
ａ，１５ｂと、予定結像面１２の中心を通り反射部材１
４ａ，１４ｂを反射して明るさ絞り１５ａ，１５ｂの夫
々の開口部の中心を通る二本の光束からほぼ等距離の位
置に光軸が有るように配置された再結像レンズ２６と、
再結像レンズ２６を射出した光束の結像位置付近に夫々
配置された受光素子列１７ａ，１７ｂとから構成されて
いる。明るさ絞り１５ａ，１５ｂはその開口部の中心を
通る光束に対して開口面が垂直となるように配置されて
おり、また、かかる明るさ絞り１５ａ，１５ｂ，反射部
材１４ａ，１４ｂ及び受光素子列１７ａ，１７ｂの、夫
々の部材の配置位置及び方向は第１実施例と同様であ
る。 Second Embodiment FIG. 3 is a diagram showing a focus detection device according to this embodiment. In the figure, the focus detection device of the present embodiment has a condenser lens 13 installed near a predetermined imaging surface 12 of a photographic lens (not shown), and a plane reflecting surface, which has different reflecting angles from each other. Reflection members 14a and 14b disposed behind the condenser lens 13; and a reflection member 1 having an opening.
Brightness diaphragms 15 arranged behind 4a and 14b, respectively
a, 15b, and the reflection member 1
A re-imaging lens 26 disposed so as to have an optical axis at a position substantially equidistant from two light fluxes that reflect the light beams 4a and 14b and pass through the centers of the respective apertures of the brightness diaphragms 15a and 15b;
Light receiving element arrays 17a and 17b are respectively arranged near the image forming position of the light beam emitted from the re-imaging lens 26. The aperture stop 15a, 15b is arranged so that the aperture surface is perpendicular to the light beam passing through the center of the aperture, and the aperture stop 15a, 15b, the reflection members 14a, 14b, and the light receiving element array The arrangement positions and directions of the members 17a and 17b are the same as in the first embodiment.
【００１８】上記構成おいて、合焦すべき物体を発した
光束は、図示されない撮影レンズ，クイックリターンミ
ラー及びサブミラーを経て予定結像面１２に達し、撮影
レンズが合焦状態の場合、予定結像面１２上に結像す
る。予定結像面１２を通過した光束は、コンデンサレン
ズ１３で瞳をリレーされ、反射部材１４ａ，１４ｂで反
射して光路が変換される。このとき、反射部材１４ａ，
１４ｂの夫々の反射面は、入射光に対する反射光の方向
が異なるように、同一ではない異なった平面上に夫々設
けられているので、かかる反射面に入射する夫々の光束
は異なる方向に反射せしめられ、夫々の反射光路上に設
けられた明るさ絞り１５ａ，１５ｂに達する。従って、
夫々の光束が明るさ絞り１５ａ，１５ｂを通過すること
により、コンデンサレンズ１３と明るさ絞り１５ａ，１
５ｂで決定される焦点検出光学系の入射瞳は、合焦精度
を確保し得る間隔を以て並んでいることになる。In the above configuration, the light beam emitted from the object to be focused reaches the planned image forming plane 12 via the taking lens (not shown), the quick return mirror, and the sub-mirror. An image is formed on the image plane 12. The luminous flux that has passed through the predetermined imaging plane 12 is relayed to the pupil by the condenser lens 13 and is reflected by the reflecting members 14a and 14b to change the optical path. At this time, the reflecting members 14a,
Since the respective reflecting surfaces of 14b are provided on different planes that are not the same so that the directions of the reflected light with respect to the incident light are different, the respective light beams incident on the reflecting surface are reflected in different directions. And reaches the aperture stop 15a, 15b provided on each reflected light path. Therefore,
Each light beam passes through the aperture stop 15a, 15b, so that the condenser lens 13 and the aperture stop 15a, 1b.
The entrance pupils of the focus detection optical system determined by 5b are arranged at intervals that can ensure focusing accuracy.
【００１９】明るさ絞り１５ａ，１５ｂを通過した光束
は、再結像レンズ２６に入射する。このとき、受光素子
列１７ａ，１７ｂの並ぶ方向に対して垂直な方向（紙面
上の平面）において、予定結像面１２の中心に対応する
物点からの光束の主光線が再結像レンズ２６に入射する
位置は異なっており、かかる再結像レンズ２６より射出
される光束を、平行に並設された受光素子列１７ａ，１
７ｂに夫々導くことができる。そして、受光素子列１７
ａ，１７ｂにおける夫々の受光面の光強度分布から、光
束の位相差が検出され、撮影レンズ１１の合焦状態が判
別されるようになっている。The light beams passing through the aperture stops 15a and 15b enter the re-imaging lens 26. At this time, in the direction perpendicular to the direction in which the light receiving element rows 17a and 17b are arranged (a plane on the paper surface), the principal ray of the light beam from the object point corresponding to the center of the planned imaging plane 12 is re-formed by the re-imaging lens 26. Are different from each other, and the luminous flux emitted from the re-imaging lens 26 is converted into the light receiving element rows 17a, 1 arranged in parallel.
7b. Then, the light receiving element row 17
The phase difference of the light beam is detected from the light intensity distribution of each light receiving surface at a and 17b, and the in-focus state of the photographing lens 11 is determined.
【００２０】本実施例は上述の如く構成されているの
で、反射部材の夫々の反射面を反射した光束の光路は異
なる方向に変換せしめられ、これを同一入射面で対応す
る一つの再結像レンズを介して受光素子列に導くように
することにより、複数の再結像レンズを配置した場合に
問題となる、再結像レンズの配置間隔の精度による組立
誤差や、再結像レンズ個々の性能のバラツキ等の、製作
誤差に起因する合焦精度劣化要因を少なくすることがで
きると共に、伸長化した受光素子列を干渉させることな
く配置することができる。従って、合焦精度を向上する
ことができると同時に、測距範囲が拡大され得、而も装
置構造をコンパクトにすることが可能である。尚、本実
施例でも、明るさ絞りは夫々の開口面が異なる平面上に
あるように配置したが、これらを同一平面上に配置する
ようにしても実用上問題はない。図３における反射部材
１４ａと１４ｂは、合焦精度が向上するのであればコン
デンサーレンズ１３の光軸と平行な光線を紙面に垂直な
成分において異なる方向にも反射するように構成しても
良い。Since the present embodiment is constructed as described above, the optical paths of the luminous flux reflected from the respective reflecting surfaces of the reflecting member are converted into different directions, and this is converted into one corresponding re-imaging image on the same incident surface. By guiding to the light receiving element array via the lens, there is a problem when a plurality of re-imaging lenses are arranged. It is possible to reduce a factor of deterioration of focusing accuracy due to a manufacturing error such as a variation in performance, and it is possible to arrange the elongated light receiving element array without causing interference. Therefore, the focusing accuracy can be improved, and at the same time, the range of distance measurement can be expanded, and the device structure can be made compact. In this embodiment as well, the aperture stop is arranged so that the respective aperture surfaces are on different planes. However, there is no practical problem if they are arranged on the same plane. The reflecting members 14a and 14b in FIG. 3 may be configured to reflect light rays parallel to the optical axis of the condenser lens 13 in different directions in a component perpendicular to the plane of the paper as long as focusing accuracy is improved.
【００２１】第３実施例 図４は本実施例の焦点検出装置を示す図である。図にお
いて、本実施例の焦点検出装置は、図示されない撮影レ
ンズの予定結像面１２の近傍に設置されたコンデンサレ
ンズ１３と、平面反射面を有し該反射面の反射角度を互
いに異ならせてコンデンサレンズ１３の後方に配置され
た反射部材１４ａ，１４ｂと、反射部材１４ａ，１４ｂ
の夫々の反射面上に該反射部材と一体的に設けられた明
るさ絞り２５ａ，２５ｂと、予定結像面１２の中心を通
り反射部材１４ａ，１４ｂを反射して明るさ絞り２５
ａ，２５ｂの夫々の開口部の中心を通る二本の光束から
ほぼ等距離の位置に光軸が有るように配置された再結像
レンズ２６と、再結像レンズ２６を射出した光束の結像
位置付近に夫々配置された受光素子列１７ａ，１７ｂと
から構成されている。反射部材１４ａ，１４ｂ、明るさ
絞り１５ａ，１５ｂ及び受光素子列１７ａ，１７ｂの、
夫々の部材の配置位置及び方向は第１実施例と同様であ
る。 Third Embodiment FIG. 4 is a diagram showing a focus detection device according to this embodiment. In the figure, the focus detection device of the present embodiment has a condenser lens 13 installed near a predetermined imaging surface 12 of a photographic lens (not shown), and a plane reflecting surface, which has different reflecting angles from each other. Reflection members 14a, 14b disposed behind the condenser lens 13, and reflection members 14a, 14b
Brightness apertures 25a, 25b provided integrally with the reflection members on the respective reflection surfaces, and the brightness apertures 25 passing through the center of the predetermined imaging surface 12 and reflecting the reflection members 14a, 14b.
a re-imaging lens 26 disposed so as to have an optical axis at a position substantially equidistant from two light beams passing through the centers of the respective openings a and 25b, and a light beam emitted from the re-imaging lens 26 being formed. And light receiving element arrays 17a and 17b arranged near the image position. The reflection members 14a and 14b, the brightness diaphragms 15a and 15b, and the light receiving element rows 17a and 17b
The arrangement position and direction of each member are the same as in the first embodiment.
【００２２】上記構成おいて、合焦すべき物体を発した
光束は、図示されない撮影レンズ，クイックリターンミ
ラー及びサブミラーを経て予定結像面１２に達し、撮影
レンズが合焦状態の場合、予定結像面１２上に結像す
る。予定結像面１２を通過した光束は、コンデンサレン
ズ１３で瞳をリレーされ、反射部材１４ａ，１４ｂで反
射して光路が変換される。このとき、反射部材１４ａ，
１４ｂの夫々の反射面は、入射光に対する反射光の方向
が異なるように、同一ではない異なった平面上に夫々設
けられているので、かかる反射面に入射する夫々の光束
は異なる方向に反射せしめられる。また、夫々の反射面
上には、反射部材１４ａ，１４ｂと一体的に、明るさ絞
り２５ａ，２５ｂが設けられており、明るさ絞り２５
ａ，２５ｂにおいて、反射面を反射して受光素子列１７
ａ，１７ｂに入射する光束の広がり（ＮＡ）が決定され
る。光束が明るさ絞り２５ａ，２５ｂを夫々通過するこ
とにより、コンデンサレンズ１３と明るさ絞り２５ａ，
２５ｂで決定される焦点検出光学系の入射瞳は、合焦精
度を確保し得る間隔を以て並んでいることになる。In the above arrangement, the light beam emitted from the object to be focused reaches the planned image forming plane 12 via the taking lens (not shown), the quick return mirror, and the sub-mirror. An image is formed on the image plane 12. The luminous flux that has passed through the predetermined imaging plane 12 is relayed to the pupil by the condenser lens 13 and is reflected by the reflecting members 14a and 14b to change the optical path. At this time, the reflecting members 14a,
Since the respective reflecting surfaces of 14b are provided on different planes that are not the same so that the directions of the reflected light with respect to the incident light are different, the respective light beams incident on the reflecting surface are reflected in different directions. Can be Further, on each of the reflecting surfaces, there are provided brightness stops 25a and 25b integrally with the reflection members 14a and 14b.
a, 25b, the light is reflected from the reflecting surface to form the light receiving element row 17
The spread (NA) of the light beam incident on a and 17b is determined. The luminous flux passes through the aperture diaphragms 25a and 25b, respectively, so that the condenser lens 13 and the aperture diaphragms 25a and 25b.
The entrance pupils of the focus detection optical system determined by 25b are arranged at intervals that can ensure focusing accuracy.
【００２３】明るさ絞り２５ａ，２５ｂを通過した光束
は、再結像レンズ２６に入射する。このとき、受光素子
列１７ａ，１７ｂの並ぶ方向に対して垂直な方向（紙面
上の平面）において、予定結像面１２の中心に対応する
物点からの光束の主光線が再結像レンズ２６に入射する
位置は異なっており、かかる再結像レンズ２６より射出
される光束を、平行に並設された受光素子列１７ａ，１
７ｂに導くことができる。そして、受光素子列１７ａ，
１７ｂにおける夫々の受光面の光強度分布から、光束の
位相差が検出され、撮影レンズ１１の合焦状態が判別さ
れるようになっている。The light beam having passed through the aperture stops 25a and 25b enters the re-imaging lens 26. At this time, in the direction perpendicular to the direction in which the light receiving element rows 17a and 17b are arranged (a plane on the paper surface), the principal ray of the light beam from the object point corresponding to the center of the planned imaging plane 12 is re-formed by the re-imaging lens 26. Are different from each other, and the luminous flux emitted from the re-imaging lens 26 is converted into the light receiving element rows 17a, 1 arranged in parallel.
7b. Then, the light receiving element rows 17a,
The phase difference of the light beam is detected from the light intensity distribution of each light receiving surface at 17b, and the in-focus state of the photographing lens 11 is determined.
【００２４】本実施例は上述の如く構成されているの
で、反射部材と明るさ絞りを一体化することにより、装
置製作及び組立上のバラツキ等の誤差による合焦精度劣
化要因を少なくすることができる。また、反射部材の夫
々の反射面を反射した光束の光路は異なる方向に変換せ
しめることにより、伸長化した受光素子列を干渉させる
ことなく配置することができる。従って、合焦精度を向
上することができると同時に、測距範囲が拡大され得、
而も装置構造をコンパクトにすることが可能である。Since the present embodiment is constructed as described above, by integrating the reflection member and the aperture stop, it is possible to reduce a factor of deterioration of the focusing accuracy due to an error such as a variation in manufacturing and assembling the apparatus. it can. In addition, by converting the light paths of the light beams reflected by the respective reflecting surfaces of the reflecting member to different directions, the elongated light receiving element rows can be arranged without causing interference. Therefore, the focusing accuracy can be improved, and at the same time, the distance measurement range can be expanded,
Also, it is possible to make the device structure compact.
【００２５】尚、上記各実施例では、明るさ絞りを二つ
用いるように構成されているが、明るさ絞りを三つ以上
用いて各明るさ絞りを通過する光束を夫々受光素子列に
導き、二つ以上の受光素子列からの情報により焦点検出
を行うように構成しても良い。この場合、全ての受光素
子列からの情報を用いても良いし、合焦範囲，撮影レン
ズ等の条件により二つ以上の受光素子列を選択し、選択
した受光素子列から得られる情報を用いても良い。ま
た、反射部材の反射面は曲面又はその他の形状でも構わ
ない。In each of the above embodiments, two brightness apertures are used. However, three or more brightness apertures are used to guide light beams passing through each brightness aperture to light receiving element arrays. Alternatively, the focus detection may be performed based on information from two or more light receiving element arrays. In this case, information from all the light receiving element rows may be used, or two or more light receiving element rows may be selected according to conditions such as a focusing range and a photographing lens, and information obtained from the selected light receiving element rows may be used. May be. Further, the reflection surface of the reflection member may be a curved surface or another shape.
【００２６】[0026]
【発明の効果】以上、本発明によれば、測距範囲の拡大
と合焦精度の向上の両方を同時に満足し、且つ構造がコ
ンパクトな焦点検出装置を提供することができる。As described above, according to the present invention, it is possible to provide a focus detection device having a compact structure that simultaneously satisfies both the expansion of the distance measurement range and the improvement of the focusing accuracy.
【図１】本発明の第１実施例の焦点検出装置を底部に配
置した一眼レフカメラの略断面図である。FIG. 1 is a schematic cross-sectional view of a single-lens reflex camera in which a focus detection device according to a first embodiment of the present invention is disposed at the bottom.
【図２】図１の要部拡大図である。FIG. 2 is an enlarged view of a main part of FIG.
【図３】第２実施例の焦点検出装置を示す図である。FIG. 3 is a diagram illustrating a focus detection device according to a second embodiment.
【図４】第３実施例の焦点検出装置を示す図である。FIG. 4 is a diagram illustrating a focus detection device according to a third embodiment.
【図５】従来の焦点検出光学系の一例を示す図である。FIG. 5 is a diagram illustrating an example of a conventional focus detection optical system.
【図６】従来の他の焦点検出光学系の概略構成を示す図
である。FIG. 6 is a diagram showing a schematic configuration of another conventional focus detection optical system.
【図７】図６の斜視図である。FIG. 7 is a perspective view of FIG. 6;
１１・・・撮影レンズ １２・・・予定結像面 １３・・・コンデンサレンズ １４ａ，１４ｂ・・・反射部材 １５ａ，１５ｂ，２５ａ，２５ｂ・・・明るさ絞り １６ａ．１６ｂ，２６・・・再結像レンズ １７ａ．１７ｂ・・・受光素子列 11 photographic lens 12 scheduled imaging plane 13 condenser lens 14a, 14b reflective member 15a, 15b, 25a, 25b brightness stop 16a. 16b, 26 ... re-imaging lens 17a. 17b: light receiving element row
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭62−3215（ＪＰ，Ａ) 特開 昭60−263912（ＪＰ，Ａ) 特開 昭54−150125（ＪＰ，Ａ) 特開 昭58−97010（ＪＰ，Ａ) 特開 昭58−108505（ＪＰ，Ａ) 特開 昭58−27110（ＪＰ，Ａ) 特開 平１−105221（ＪＰ，Ａ) 特開 昭59−42509（ＪＰ，Ａ) 特開 昭59−42508（ＪＰ，Ａ) 特開 昭63−289513（ＪＰ，Ａ) 特開 平３−231710（ＪＰ，Ａ) 特開 昭61−83511（ＪＰ，Ａ) 特開 昭58−114008（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G02B 7/28 - 7/40 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-2315 (JP, A) JP-A-60-263912 (JP, A) JP-A-54-150125 (JP, A) JP-A 58- 97010 (JP, A) JP-A-58-108505 (JP, A) JP-A-58-271110 (JP, A) JP-A-1-105221 (JP, A) JP-A-59-42509 (JP, A) JP-A-59-42508 (JP, A) JP-A-63-289513 (JP, A) JP-A-3-231710 (JP, A) JP-A-61-83511 (JP, A) JP-A-58-114008 (JP, A) (58) Field surveyed (Int. Cl. 7 , DB name) G02B 7/ 28-7/40
Claims (8)
数の入射瞳を有する焦点検出光学系が、撮影レンズの予
定結像面の近傍に設置されたコンデンサレンズと、複数
の開口部を有する明るさ絞りと、上記コンデンサレンズ
と明るさ絞りとの間に設置されていて上記開口部に対応
した反射面を有する反射部材と、再結像レンズと、上記
開口部の各々に対応して並設された複数の受光素子列か
らなる光電変換手段とから構成されていて、 上記撮影レンズの異なる領域を通過した複数の光束を上
記反射部材，明るさ絞り及び再結像レンズを介して上記
光電変換手段で受け、該光電変換手段の受光面の光強度
分布から上記複数の光束の位相差を検出することにより
焦点検出を行うようにした焦点検出装置において、 上記反射部材の反射面のうち少なくとも一つは、当該他
の少なくとも一つの反射面とは異なる面上に設けられて
いて、互いの反射面に対応する上記受光素子列を該素子
列の長手方向と直交する方向に並設させ、且つ、反射光
どうしの間隔から上記コンデンサレンズからの入射光軸
を外すように反射光を反射させるべく、入射光に対する
反射光の方向を上記他の少なくとも一つの反射面とは異
ならせるようにしたことを特徴とする焦点検出装置。A focus detection optical system having a plurality of entrance pupils arranged at intervals capable of ensuring focusing accuracy includes a condenser lens installed near a predetermined imaging plane of a photographing lens and a plurality of apertures. A brightness stop, a reflection member provided between the condenser lens and the brightness stop and having a reflection surface corresponding to the opening, a re-imaging lens, and a parallel arrangement corresponding to each of the openings. A plurality of light beams passing through different areas of the photographing lens through the reflecting member, the aperture stop, and the re-imaging lens. A focus detection device configured to perform focus detection by detecting a phase difference between the plurality of light fluxes from a light intensity distribution on a light receiving surface of the photoelectric conversion means; Both one and with the other of the at least one reflective surface provided on different surfaces, the element of the light receiving element arrays corresponding to the reflection surface of each other
The direction of the reflected light with respect to the incident light is set to be other than that described above so that the reflected light is reflected in such a manner as to be juxtaposed in the direction perpendicular to the longitudinal direction of the row and to reflect the incident optical axis from the condenser lens from the interval between the reflected lights. A focus detection device which is different from at least one of the reflection surfaces.
数の入射瞳を有する焦点検出光学系が、撮影レンズの予
定結像面の近傍に設置されたコンデンサレンズと、複数
の開口部を有する明るさ絞りと、該明るさ絞りと一体に
設けられていて上記開口部に対応した反射面を有する反
射部材と、再結像レンズと、上記開口部の各々に対応し
て並設された複数の受光素子列からなる光電変換手段と
から構成されていて、 上記撮影レンズの異なる領域を通過した複数の光束を上
記明るさ絞りと一体の反射部材及び再結像レンズを介し
て上記光電変換手段で受け、該光電変換手段の受光面の
光強度分布から上記複数の光束の位相差を検出すること
により焦点検出を行うようにした焦点検出装置におい
て、 上記反射部材の反射面のうち少なくとも一つは、当該他
の少なくとも一つの反射面とは異なる面上に設けられて
いて、互いの反射面に対応する上記受光素子列を該素子
列の長手方向と直交する方向に並設させ、且つ、反射光
どうしの間隔から上記コンデンサレンズからの入射光軸
を外すように反射光を反射させるべく、入射光に対する
反射光の方向を上記他の少なくとも一つの反射面とは異
ならせるようにしたことを特徴とする焦点検出装置。2. A focus detection optical system having a plurality of entrance pupils arranged at intervals capable of ensuring focusing accuracy, comprising: a condenser lens installed near a predetermined imaging plane of a photographing lens; and a plurality of apertures. A brightness stop, a reflection member provided integrally with the brightness stop and having a reflection surface corresponding to the opening, a re-imaging lens, and a plurality of juxtapositions corresponding to each of the openings. A plurality of light fluxes passing through different areas of the photographing lens through the reflection member and the re-imaging lens integrated with the aperture stop. Wherein the focus detection is performed by detecting a phase difference between the plurality of light fluxes from a light intensity distribution on a light receiving surface of the photoelectric conversion means, wherein at least one of the reflection surfaces of the reflection member is provided. Is The said other at least one reflective surface provided on different surfaces, the element of the light receiving element arrays corresponding to the reflection surface of each other
The direction of the reflected light with respect to the incident light is set to be other than that described above so that the reflected light is reflected in such a manner as to be juxtaposed in the direction perpendicular to the longitudinal direction of the row and to reflect the incident optical axis from the condenser lens from the interval between the reflected lights. A focus detection device which is different from at least one of the reflection surfaces.
の反射光路上に、前記各明るさ絞りに対応させてそれぞOn each reflected light path, corresponding to each of the aperture stops.
れ配置した複数の再結像レンズであることを特徴とするCharacterized by a plurality of re-imaging lenses arranged and arranged
請求項１または２に記載の焦点検出装置。The focus detection device according to claim 1.
絞りを通過した光束に同一の入射面で対応する一つの再One beam corresponding to the light beam passing through the aperture on the same entrance surface
結像レンズであることを特徴とする請求項１または２に3. An imaging lens according to claim 1 or 2,
記載の焦点検出装置。The focus detection device according to any one of the preceding claims.
夫々配置されたことを特徴とする請求項１乃至４の何れ5. The method according to claim 1, wherein the respective elements are arranged.
かに記載の焦点検出装置。A focus detection device according to any one of the above.
中心を通り前記反射部材を反射して前記明るさ絞りの開Open the aperture stop by reflecting the reflecting member through the center
口部中心を通る光束とほぼ光軸を一致させて夫々配置さThe light beam passing through the center of the mouth is almost aligned with the optical axis.
れたことを特徴とする請求項３に記載の焦点検出装置。The focus detection device according to claim 3, wherein
中心を通り前記反射部材を反射して前記明るさ絞りの夫Reflecting the reflecting member through the center, the husband of the aperture stop
々の開口部の中心を通る二本の光束からほぼ等距離の位Equal distance from two beams passing through the center of each opening
置に光軸があるように配置されたことを特徴とする請求Wherein the optical axis is located at the position
項４に記載の焦点検出装置。Item 5. The focus detection device according to Item 4.
る光束に対して各開口面が垂直となるように夫々配置さAre arranged so that each aperture plane is perpendicular to the luminous flux
れたことを特徴とする請求項１に記載の焦点検出装置。The focus detection device according to claim 1, wherein
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2413993A JP3359682B2 (en) | 1993-02-12 | 1993-02-12 | Focus detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2413993A JP3359682B2 (en) | 1993-02-12 | 1993-02-12 | Focus detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06235855A JPH06235855A (en) | 1994-08-23 |
| JP3359682B2 true JP3359682B2 (en) | 2002-12-24 |
Family
ID=12129992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2413993A Expired - Fee Related JP3359682B2 (en) | 1993-02-12 | 1993-02-12 | Focus detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3359682B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19831062A1 (en) | 1998-07-10 | 2000-01-13 | Gaemmerler Ag | Conveyor system |
-
1993
- 1993-02-12 JP JP2413993A patent/JP3359682B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06235855A (en) | 1994-08-23 |
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