JPH0355947Y2 - - Google Patents
Info
- Publication number
- JPH0355947Y2 JPH0355947Y2 JP1981018185U JP1818581U JPH0355947Y2 JP H0355947 Y2 JPH0355947 Y2 JP H0355947Y2 JP 1981018185 U JP1981018185 U JP 1981018185U JP 1818581 U JP1818581 U JP 1818581U JP H0355947 Y2 JPH0355947 Y2 JP H0355947Y2
- Authority
- JP
- Japan
- Prior art keywords
- lens
- pair
- objective lens
- field
- optical systems
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000001514 detection method Methods 0.000 claims description 11
- 238000003384 imaging method Methods 0.000 claims description 11
- 230000003287 optical effect Effects 0.000 claims description 6
- 210000001747 pupil Anatomy 0.000 claims description 6
- 230000011514 reflex Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 description 3
- 230000002411 adverse Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Landscapes
- Focusing (AREA)
- Cameras In General (AREA)
Description
【考案の詳細な説明】
本考案は一眼レフレツクスカメラの焦点検出装
置に関する。[Detailed Description of the Invention] The present invention relates to a focus detection device for a single-lens reflex camera.
一眼レフレツクスカメラの撮影用対物レンズを
透過した透過光から、一対の再結像レンズによつ
てそれぞれ第１像および第２像を形成し、この一
対の再結像レンズの焦点面またはその近傍に配置
された一対の像位置検出用光電変換器に対する前
記第１像および第２像の位置の変化から、対物レ
ンズの合焦状態を検出する一眼レフレツクスカメ
ラ用焦点検出装置は、例えば特開昭54−7323号公
報によつて既に公知である。 A pair of re-imaging lenses forms a first image and a second image, respectively, from the transmitted light that has passed through the photographing objective lens of a single-lens reflex camera. A focus detection device for a single-lens reflex camera that detects the in-focus state of an objective lens from changes in the positions of the first image and the second image with respect to a pair of photoelectric converters for image position detection arranged in the vicinity, for example. This is already known from Japanese Patent Application Laid-open No. 7323/1983.
また、上記のような焦点検出装置をカメラに組
み込むに際して、対物レンズによる焦点位置付近
に、再結像レンズの瞳を対物レンズの瞳付近に結
像させる視野レンズを配置することも例えば実開
昭55−26516号公報等により公知である。 Furthermore, when incorporating the above-mentioned focus detection device into a camera, it is also possible to place a field lens near the focus position of the objective lens to form an image of the pupil of the re-imaging lens near the pupil of the objective lens. It is publicly known from Publication No. 55-26516 and the like.
しかるに、このような種類の焦点検出装置をカ
メラのフアインダー内でなく、ミラーボツクス底
部に組込もうとする時は以下に述べるような欠点
が存在する。第１図に従つてこれを説明する。 However, when attempting to incorporate this type of focus detection device into the bottom of the mirror box rather than within the viewfinder of the camera, there are drawbacks as described below. This will be explained according to FIG.
第１図において撮影用対物レンズ１を射出した
光はその一部が光透過可能であるクイツクリター
ンミラー２を透過し、サブミラー３によつて下方
へと反射される。そしてサブミラー３に関しフイ
ルム面４と共役な位置に配置された視野レンズ５
において被写体像を結像する。この像から出た光
は分離ミラー６によりカメラの左右長手方向に分
離され、一対の再結像レンズ７，７′によりこの
再結像レンズの焦点面又はその近傍に配置した光
電変換器８，８′上に再結像する。これらの光電
変換器８，８′の出力を比較することにより、焦
点検出が行なわれる。 In FIG. 1, a portion of the light emitted from the photographing objective lens 1 passes through a quick return mirror 2 which can transmit light, and is reflected downward by a sub-mirror 3. A field lens 5 is arranged at a position conjugate with the film surface 4 with respect to the sub-mirror 3.
A subject image is formed at . The light emitted from this image is separated in the left and right longitudinal directions of the camera by a separation mirror 6, and a photoelectric converter 8, which is placed at or near the focal plane of this re-imaging lens, is used by a pair of re-imaging lenses 7, 7'. The image is re-imaged on 8'. Focus detection is performed by comparing the outputs of these photoelectric converters 8, 8'.
このような装置における欠点は、サブミラー３
を対物レンズ１の光軸上の前方（対物レンズ１の
存在する方向）に配置することが空間的な制約の
ために困難であるので、視野レンズ５の位置がカ
メラのミラーボツクス底面より上方になつてしま
つたり、もしくは底面付近になつてしまうことで
ある。この結果、撮影時に対物レンズ１から射出
してフイルム面４に至る有効な光がケラレてしま
つたり、もしくは視野レンズ５の表面がこれらの
有効光束に近いため、撮影画面に対し無用なフレ
アー、ゴーストが発生するという欠点があつた。
これらを防ぐために、撮影時には視野レンズ５を
例えばカメラボデイーの下方に退避させることも
考えられるが、機構上の負担も大きく、又、コス
トの上昇にもなるので好ましいことではない。 The disadvantage of such a device is that the submirror 3
Because it is difficult to place the field lens 5 in front of the optical axis of the objective lens 1 (in the direction in which the objective lens 1 exists) due to spatial constraints, the field lens 5 is positioned above the bottom of the mirror box of the camera. This means that it gets old or becomes near the bottom. As a result, the effective light emitted from the objective lens 1 and reaching the film surface 4 is vignetted during photographing, or the surface of the field lens 5 is close to these effective light beams, causing unnecessary flare and light to the photographic screen. There was a drawback that ghosts occurred.
In order to prevent these problems, it is conceivable to retract the field lens 5, for example, below the camera body during photographing, but this is not preferable as it imposes a large mechanical burden and also increases costs.
本考案はこれらの欠点を解決し、簡単な構成で
撮影時に悪影響のない焦点検出装置を得ることを
目的とする。 It is an object of the present invention to solve these drawbacks and to obtain a focus detection device that has a simple configuration and does not have any adverse effects during photographing.
本考案を実施例を示す第２図の断面図に従つて
説明する。同図において、第１図と同一符号は同
一の作用を果す。この実施例においてサブミラー
３に関し、フイルム面４と共役な面はミラーボツ
クス底面９となつている。そして、視野レンズ５
はミラーボツクス底部に沈めて配置され、又、視
野絞り１０がフイルム面４と共役な面に設けられ
ている。 The present invention will be explained with reference to the sectional view of FIG. 2 showing an embodiment. In this figure, the same symbols as in FIG. 1 have the same functions. In this embodiment, the surface of the sub-mirror 3 that is conjugate with the film surface 4 is the bottom surface 9 of the mirror box. And field lens 5
is disposed sunk in the bottom of the mirror box, and a field stop 10 is provided on a surface conjugate to the film surface 4.
このような構成となつているので、視野レンズ
５がフイルム面４と共役な面、即ち、対物レンズ
１の焦点面になくても余剰光は視野絞り１０によ
つてカツトされるので、焦点検出の誤差を生じさ
せることはない。 With this configuration, even if the field lens 5 is not in a plane conjugate with the film surface 4, that is, in the focal plane of the objective lens 1, excess light is cut off by the field diaphragm 10, so that focus detection is possible. This will not cause any errors.
また、視野レンズ５がミラーボツクス底面９よ
り沈めて配置されているので、対物レンズ１やミ
ラーボツクス内の種々な面からの有害な光が撮影
時に視野レンズ５の表面において反射し、フイル
ム面４にゴーストやフレアーを発生させることは
少なくなつているが、さらに視野絞り１０がこれ
らの有害光に対する遮蔽板の作用をも併せ持つて
いるので、上記の効果は一層高められるものであ
る。 Furthermore, since the field lens 5 is placed below the bottom surface 9 of the mirror box, harmful light from the objective lens 1 and various surfaces inside the mirror box is reflected on the surface of the field lens 5 during photographing, and the film surface 4 However, since the field stop 10 also functions as a shielding plate against these harmful lights, the above-mentioned effects are further enhanced.
尚、視野レンズ５が対物レンズ１の焦点面位置
と正確に一致していなくとも、その機能を満たす
ような構成とすること、即ち再結像レンズ７の瞳
を対物レンズ１の瞳付近に結像させるように視野
レンズ５のパワーを決定することは十分可能であ
る。従つて前述の効果をもたらすために、視野レ
ンズ５の本来の機能を損うことは全くない。 It should be noted that even if the field lens 5 does not exactly match the focal plane position of the objective lens 1, it should be configured so as to satisfy its function, that is, the pupil of the re-imaging lens 7 should be focused near the pupil of the objective lens 1. It is quite possible to determine the power of the field lens 5 so as to produce an image. Therefore, in order to bring about the above-mentioned effect, the original function of the field lens 5 is not impaired at all.
また、視野絞り１０は単独に設けてもよいが、
本実施例の説明で述べたようにミラーボツクス底
面９の開口として構成する方が構造が単純で有利
である。 Further, the field stop 10 may be provided independently, but
As described in the description of this embodiment, it is advantageous to form the opening in the bottom surface 9 of the mirror box because the structure is simpler.
また、上述した実施例では再結像レンズ７，
７′が再結像光学系を構成している。 In addition, in the embodiment described above, the re-imaging lens 7,
7' constitutes a re-imaging optical system.
以上のように本考案によれば、ミラーボツクス
の底面自身で視野絞りを形成しているから、視野
絞りをミラーボツクスと別個に設ける必要がなく
構成が簡単であり、視野レンズを視野絞りの下方
に設けているから撮影時に撮影レンズを透過した
光が視野レンズの光入射面で反射してフイルム面
に有害光として導かれることをこの視野絞りによ
つて防止することができるから、正確な焦点検出
ができる。 As described above, according to the present invention, since the field diaphragm is formed on the bottom surface of the mirror box itself, there is no need to provide the field diaphragm separately from the mirror box, and the configuration is simple. This field diaphragm prevents the light that passes through the photographic lens during photography from being reflected on the light incident surface of the field lens and being directed to the film surface as harmful light, allowing for accurate focusing. Can be detected.
第１図は本考案を説明する為の図である。第２
図は本考案による装置の断面図である。
主要部分の符号の説明、１……撮影用対物レン
ズ、２……クイツクリターンミラー、３……サブ
ミラー、４……フイルム面、５……視野レンズ、
７，７′……再結像レンズ、８，８′……光電変換
器、９……ミラーボツクス底面、１０……視野絞
り。
FIG. 1 is a diagram for explaining the present invention. Second
The figure is a sectional view of the device according to the invention. Explanation of symbols of main parts, 1...Objective lens for photographing, 2...Quick return mirror, 3...Sub mirror, 4...Film surface, 5...Field lens,
7, 7'... Re-imaging lens, 8, 8'... Photoelectric converter, 9... Bottom of mirror box, 10... Field diaphragm.
Claims (1)
光が透過可能なクイツクリターンミラーとを透過
した透過光を該クイツクリターンミラーの後方に
配置されたサブミラーによつてカメラのミラーボ
ツクス下方へと導き、前記透過光から該ミラーボ
ツクス下方に配置された一対の再結像光学系によ
つてそれぞれ第１像および第２像を形成し、該一
対の再結像光学系の焦点面又はその近傍に配置さ
れた一対の像位置検出用光電変換器に対する前記
第１像および第２像の位置の変化から前記撮影用
対物レンズの合焦状態を検出する一眼レフレツク
スカメラの焦点検出装置において、 前記サブミラーに関しフイルム面と共役な面付
近に視野絞りを設けて、該サブミラーからの光を
該視野絞りを介して前記一対の再結像光学系へ導
くようになすとともに、前記視野絞りを前記ミラ
ーボツクス自身の底面に開口として形成し、前記
一対の再結像光学系の瞳を前記撮影用対物レンズ
の瞳付近に結像する視野レンズを、前記ミラーボ
ツクスの底面より下方に沈めて配置したことを特
徴とする、一眼レフレツクスカメラの焦点検出装
置。[Claims for Utility Model Registration] Transmitted light that has passed through the photographing objective lens of a single-lens reflex camera and a quick return mirror that can transmit light is transmitted by a submirror placed behind the quick return mirror. A first image and a second image are respectively formed from the transmitted light by a pair of re-imaging optical systems disposed below the mirror box, and the pair of re-imaging optical systems A single-lens reflex camera that detects the in-focus state of the photographing objective lens from changes in the positions of the first and second images with respect to a pair of image position detection photoelectric converters arranged at or near the focal plane of the system. In the focus detection device of the camera, a field stop is provided in the vicinity of a plane conjugate with the film surface with respect to the submirror, and light from the submirror is guided to the pair of reimaging optical systems via the field stop; , the field diaphragm is formed as an opening on the bottom surface of the mirror box itself, and a field lens that images the pupils of the pair of re-imaging optical systems near the pupil of the photographing objective lens is formed from the bottom surface of the mirror box. A focus detection device for a single-lens reflex camera, characterized by being sunk downward.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1981018185U JPH0355947Y2 (en) | 1981-02-13 | 1981-02-13 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1981018185U JPH0355947Y2 (en) | 1981-02-13 | 1981-02-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57133018U JPS57133018U (en) | 1982-08-19 |
| JPH0355947Y2 true JPH0355947Y2 (en) | 1991-12-13 |
Family
ID=29816154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1981018185U Expired JPH0355947Y2 (en) | 1981-02-13 | 1981-02-13 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0355947Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007178854A (en) * | 2005-12-28 | 2007-07-12 | Fujitsu Ltd | Mounting member, device, manufacturing method of device, and mounting method of target member |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54145133A (en) * | 1978-05-02 | 1979-11-13 | Asahi Optical Co Ltd | Focus detector |
| JPS55146423A (en) * | 1979-05-01 | 1980-11-14 | Nippon Kogaku Kk <Nikon> | Focus detector |
-
1981
- 1981-02-13 JP JP1981018185U patent/JPH0355947Y2/ja not_active Expired
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54145133A (en) * | 1978-05-02 | 1979-11-13 | Asahi Optical Co Ltd | Focus detector |
| JPS55146423A (en) * | 1979-05-01 | 1980-11-14 | Nippon Kogaku Kk <Nikon> | Focus detector |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007178854A (en) * | 2005-12-28 | 2007-07-12 | Fujitsu Ltd | Mounting member, device, manufacturing method of device, and mounting method of target member |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57133018U (en) | 1982-08-19 |
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