JPS62192730A - Photometric device for single lens reflex camera - Google Patents
Photometric device for single lens reflex cameraInfo
- Publication number
- JPS62192730A JPS62192730A JP61035441A JP3544186A JPS62192730A JP S62192730 A JPS62192730 A JP S62192730A JP 61035441 A JP61035441 A JP 61035441A JP 3544186 A JP3544186 A JP 3544186A JP S62192730 A JPS62192730 A JP S62192730A
- Authority
- JP
- Japan
- Prior art keywords
- photometric
- photometry
- light
- output
- focusing screen
- 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.)
- Pending
Links
- 230000011514 reflex Effects 0.000 title claims description 5
- 238000005375 photometry Methods 0.000 claims abstract description 45
- 230000004907 flux Effects 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 abstract 1
- 230000001502 supplementing effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 108091008695 photoreceptors Proteins 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
Landscapes
- Exposure Control For Cameras (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は一眼レフレックスカメラの測光装置に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a photometric device for a single-lens reflex camera.
従来、−眼し７レツクスカメ２の測光装置とし系を配置
する構成が最も簡便のため多く用いられている。とζろ
で、この測光系はファインダー観察系の光束を遮ざらな
いようにファインダー光軸から離れた位置に配置されて
いるため、撮影レンズのＦナンバーと測光量の比例関係
が悪くなりやすいがピント板のマット面により、あらゆ
るＦナンバー光束が拡散して測光系に入射することから
、この比例関係がある程度維持されている。ところが距
離計部のピント板の場合、距離計部がほぼ素通しとなる
ため、Ｆナンバーと測光量の比例関係が充分に維持され
ないことがある。Conventionally, a configuration in which a system is arranged as a photometric device for a seven-eye camera 2 has been widely used because it is the simplest. However, since this photometry system is located far from the viewfinder optical axis so as not to block the light flux of the viewfinder observation system, the proportional relationship between the F number of the photographing lens and the amount of photometry tends to deteriorate. The matte surface of the focusing plate causes all F-number light beams to be diffused and enter the photometry system, so this proportional relationship is maintained to some extent. However, in the case of the focus plate of the rangefinder section, the rangefinder section is almost transparent, so the proportional relationship between the F-number and the amount of photometry may not be maintained sufficiently.
すなわち、撮影画面の大部分を測光する、いわゆる平均
測光の場合、測光画面範囲に対する距離計部の占める面
積の割合が小さいために素通しの影響は小さい。That is, in the case of so-called average photometry, in which most of the photographic screen is photometered, the effect of direct penetration is small because the ratio of the area occupied by the rangefinder section to the photometering screen range is small.
しかし、測光画面範囲を中央部に限定したいわゆる部分
測光の場合、測光画面範囲に対して相対的に距離計部の
面積が増し、Ｆナンバーと測光量の比例関係の悪化が無
視できなくなる。そのため測光系の受光素子面上の距離
計部に相当する部分に遮光部を設は距離計の影響を除去
することを提案した。However, in the case of so-called partial photometry in which the photometry screen range is limited to the center, the area of the distance meter section increases relative to the photometry screen range, and the deterioration of the proportional relationship between the F number and the amount of photometry cannot be ignored. Therefore, we proposed to eliminate the influence of the rangefinder by installing a light shielding section on the photoreceptor surface of the photometry system in the area corresponding to the rangefinder section.
ところが、遮光部を設けることによって、距離計部にお
ける被写体像については測光を無視するととてなるので
遮光部の面積はある程度以上には大きくできない。その
ため、測光量の比例関係の悪化が多少残りまた限定でき
る中央部の測光範囲の大きさにも制限が生じていた。そ
のため、受光素子を多分割して細分化された各受光素子
の測光出力から逆光シーンなどの輝度分布を判断して露
出補正を自動的に行なう測光方式などにも制限を与えて
いた。However, by providing the light-shielding portion, the area of the light-shielding portion cannot be increased beyond a certain level because the subject image in the rangefinder section will be ignored if photometry is ignored. As a result, the proportionality of the photometric quantities remains somewhat deteriorated, and the size of the photometric range in the central portion that can be limited is also limited. For this reason, limitations have also been placed on photometry methods that automatically perform exposure correction by dividing the light-receiving element into multiple parts and determining the brightness distribution of a backlit scene from the photometry output of each subdivided light-receiving element.
本発明は、このような従来の問題点を解決するためにな
されたもので、狭い測光範囲の測光においてもＦナンバ
ー比例性が良好に維持できる一眼レフレックスカメラの
測光装置を提供することを目的とするものである。The present invention was made to solve these conventional problems, and an object of the present invention is to provide a photometry device for a single-lens reflex camera that can maintain good F-number proportionality even in photometry in a narrow photometry range. That is.
本発明による一眼レフレックスカメラの測光装置は、ピ
ント板を通過した光束をベンタダノ・プリズムの射出面
後方で、該ピント板の距離計部の通過光を含まない状態
で測光する第１の測光手段と、ビームスシリツタ−特性
を有するクイックリターンミラーの透過光をスポット測
光する第２の測光手段とを備え、前記第１の測光手段の
測光出力を前記第２の測光手段の測光出力にて補償する
ように構成したことを特徴とするものである。The photometry device for a single-lens reflex camera according to the present invention includes a first photometry device that measures the light beam that has passed through the focusing plate behind the exit surface of the Ventadano prism without including the light that has passed through the rangefinder section of the focusing plate. and a second photometric means for spot metering the transmitted light of the quick return mirror having beam sintering characteristics, and the photometric output of the first photometric means is compensated by the photometric output of the second photometric means. The invention is characterized in that it is configured to do so.
以下本発明を図面に示す実施例て基づいて説明する。 The present invention will be explained below based on embodiments shown in the drawings.
第１図は本発明の実施例の光学配置を示す図である。図
中、１は撮影レンズ、２はハーフミラ−であるクイック
リターンミラー、３は距離計付ピント板、４は檀ンタダ
ノ・プリズム、５は接眼レンズ、６は結像レンズ、７は
中央部と周辺部に分割された受光素子、８は小ミラー、
９は１次ビ／ト面、１０は集光レンズ、１１は受光素子
、１２はフィルム面である。ファインダー観察系は、撮
影レンズｌおよびクイックリターンミラー２１に介して
ピント板３に結像された像を、ペンタダハグリズム４と
接眼レンズ５を通して観察できるように構成される。ま
た、このファインダー観察系の光束を遮ぎらないように
にノタダハグリズム４の射出面の後方に配置された結像
レンズ６と受光素子７によって第１の側光系が構成され
ている。第１の測光系は、結像レンズ６によってピント
板３と受光素子７が略結像関係になっており、受光素子
７の中央部の測光出力のみ取り出せばいわゆる部分測光
が可能となる。FIG. 1 is a diagram showing an optical arrangement of an embodiment of the present invention. In the figure, 1 is a photographing lens, 2 is a quick return mirror that is a half mirror, 3 is a focusing plate with a rangefinder, 4 is a Dantadano prism, 5 is an eyepiece lens, 6 is an imaging lens, and 7 is a central part and periphery. A light-receiving element divided into parts, 8 is a small mirror,
9 is a primary bit surface, 10 is a condenser lens, 11 is a light receiving element, and 12 is a film surface. The finder observation system is configured so that an image formed on the focusing plate 3 via the photographic lens 1 and the quick return mirror 21 can be observed through the pentagonal grism 4 and the eyepiece lens 5. Further, a first side light system is constituted by an imaging lens 6 and a light receiving element 7, which are arranged behind the exit surface of the notadah grism 4 so as not to block the light beam of the finder observation system. In the first photometric system, the focusing plate 3 and the light-receiving element 7 are in a substantially image-forming relationship through the imaging lens 6, and so-called partial photometry is possible by extracting only the photometric output from the center of the light-receiving element 7.
ｇｔの測光系はピント板３のマット面による拡散光を利
用して撮影レンズ１のＦナンバーと測光量との比例関係
を維持している。ピント板３は、第２図に示すように、
中心部にスプリットイメージ３ａの部分測光の範囲を示
すマーク３ｂが設けられている。ところで、スプリット
イメージ３ａは光を拡散せず素通し部がピント板上にあ
ると等価であるために、前述した如く、撮影レンズのＦ
ナンバーと測光量との関係を悪化させる要因となる。The photometry system of the GT uses the light diffused by the matte surface of the focusing plate 3 to maintain a proportional relationship between the F number of the photographic lens 1 and the amount of photometry. The focusing plate 3 is, as shown in FIG.
A mark 3b indicating the range of partial photometry of the split image 3a is provided at the center. By the way, since the split image 3a does not diffuse light and is equivalent to the transparent part being on the focusing plate, as mentioned above, the F of the photographing lens is
This becomes a factor that worsens the relationship between the number and the amount of photometry.
そこで、本実施例においては、受光素子７の受光面に第
３図に示すようにピント板３のスプリットイメージ３ａ
および測光範囲用マーク３ｂに対応して遮光域７ｍ、７
ｃを設けるとともに、他の領域を受光域７ｂ 、７ｄと
している。Therefore, in this embodiment, a split image 3a of the focusing plate 3 is placed on the light receiving surface of the light receiving element 7 as shown in FIG.
and a light-shielding area of 7 m, 7 m corresponding to the photometric range mark 3b.
c is provided, and the other areas are designated as light receiving areas 7b and 7d.
すなわち、受光域７ｂだけの測光出力を取り出した場合
には、これによって部分測光は測光領域全域の測光が可
能となる。また平均測光に用いてよいのは勿論である。That is, when the photometric output of only the light-receiving area 7b is extracted, partial photometry allows photometry of the entire photometric area. Of course, it may also be used for average photometry.
但し、第１の測光系と第２の測光系は測光方式が異なる
ので同一範囲を測光しても測光出力は異なる。そのため
、部分測光に第２の測光系によるスポット測光の出力を
加算する場合にはンペル合せをする必要がある。However, since the first photometric system and the second photometric system use different photometric methods, the photometric outputs will be different even if they measure the same range. Therefore, when adding the output of the spot photometry by the second photometry system to the partial photometry, it is necessary to perform a wavelength adjustment.
第４図は測光モード選択によって変わる測光出力を示す
フローチャートである。図中Ａは受光素子７の受光域７
ｄの測光出力、Ｂは受光素子７の受光域７ｂの測光出力
、Ｃは受光素子１１の測光出力を示し、ｌＡ、ＩＢ＋１
．は測光モード選択により変換された測光出力を表わす
、またＫはレベル合せのための係数である。FIG. 4 is a flowchart showing the photometric output that changes depending on the photometric mode selection. In the figure, A is the light receiving area 7 of the light receiving element 7.
d is the photometric output, B is the photometric output of the light receiving area 7b of the light receiving element 7, C is the photometric output of the light receiving element 11, lA, IB+1
．． represents the photometric output converted by the photometric mode selection, and K is a coefficient for level adjustment.
平均測光モードを選択した場合における測光出力ｉＡ＋
ＩＢ＋ＩＣは、Ａ＋Ｂ＋ＫＣが出力され、部分測光モー
ドを選択した場合における測光出力ｉＡ＋ｉＢ＋ＩＣは
、Ｂ＋ＫＣが出力され、さらにス？ット測光モードを選
択した場合における測光出力ｉＡ＋ｔ。Metering output iA+ when average metering mode is selected
IB+IC outputs A+B+KC, and when partial metering mode is selected, the photometric output iA+iB+IC outputs B+KC, and furthermore, when partial metering mode is selected, B+KC is output. Photometry output iA+t when the photometry mode is selected.
＋ＩＣは、Ｃが出力される。+IC outputs C.
なお、上記し九実施例において、受光素子７はその受光
面を２分割しているが多分割であってもよい。多分割の
受光面をもつことによって各受光面の測光出力分布を用
いて例えば逆光シーンを判別して自動的に露出補正を加
えられるいわゆる評価測光も正確に行なうことができる
。In the nine embodiments described above, the light-receiving surface of the light-receiving element 7 is divided into two parts, but it may be divided into multiple parts. By having a multi-divided light-receiving surface, it is also possible to accurately perform so-called evaluative photometry in which exposure compensation is automatically applied by determining, for example, a backlit scene using the photometric output distribution of each light-receiving surface.
以上説明したように、本発明によれば、第１の測光系に
よる測光不感域を第２の測光系によシ補。As explained above, according to the present invention, the photometric dead area caused by the first photometric system is compensated for by the second photometric system.
うようにしているので、Ｆナンバー比例性を極めて良好
て維持でき、その結果絞りを絞り込んでも正確な測光が
可能となり、さらに測光範囲の切換先可能な測光装置に
適用した場合、測光範囲の切換えによってもＦナンバー
比例性を極めて良好に維持することができるといった多
くの利点を有し、その実用上の利益は犬なるものである
。As a result, extremely good F-number proportionality can be maintained, and as a result, accurate photometry is possible even when the aperture is narrowed down.Furthermore, when applied to a photometer that can switch the photometry range, it is possible to switch the photometry range. It has many advantages such as being able to maintain F-number proportionality extremely well, and its practical benefits are significant.
第１図は本発明による測光装置の一実施例の光学配置を
示す図、
第２図は第１図に用いられるピント板を示す図、第３図
は第１図のペンタダハゾリズム側の測光系に用いられる
受光素子の受光面を示す図、第４図は本発明の実施例を
示すフローチャートである。
１・・・撮影レンズ、
２・・・クイックリターンミラー、
３・・・ピント板、 ４・・・ペンタダハプ
リズム、５・・・接眼レンズ、 ６・・・結像レ
ンズ、７・・・受光素子、 ８・・・小ミラー
、９・・・１次ピント面、 １０・・・集光レンズ
、１１・・・受光素子、 １２・・・フィルム面
。
第２図
第３図
７゜
ｂ７ｃ７ｄ
第４図
手続補正書
昭和２７年７月ｌ？日FIG. 1 is a diagram showing the optical arrangement of an embodiment of the photometric device according to the present invention, FIG. 2 is a diagram showing the focusing plate used in FIG. 1, and FIG. FIG. 4, which is a diagram showing a light receiving surface of a light receiving element used in a photometric system, is a flowchart showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Photographing lens, 2...Quick return mirror, 3...Focus plate, 4...Penta roof prism, 5...Eyepiece lens, 6...Imaging lens, 7...Light receiving element , 8... Small mirror, 9... Primary focus surface, 10... Condensing lens, 11... Light receiving element, 12... Film surface. Figure 2 Figure 3 7゜b7c7d Figure 4 Procedural amendment July 1950 l? Day
Claims (1)
後方で、該ピント板の距離計部の通過光を含まない状態
で測光する第１の測光手段と、ビームスプリッター特性
を有するクイックリターンミラーの透過光をスポット測
光する第２の測光手段とを備え、前記第１の測光手段の
測光出力を前記第２の測光手段の測光出力にて補償する
ように構成したことを特徴とする一眼レフレックスカメ
ラの測光装置。A first photometry means that measures the light beam that has passed through the focusing plate behind the exit surface of the penta roof prism without including the light that has passed through the rangefinder section of the focusing plate, and the transmitted light of the quick return mirror that has beam splitter characteristics. and a second photometry means for spot photometry, the single-lens reflex camera being configured to compensate the photometry output of the first photometry means with the photometry output of the second photometry means. Photometric device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61035441A JPS62192730A (en) | 1986-02-20 | 1986-02-20 | Photometric device for single lens reflex camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61035441A JPS62192730A (en) | 1986-02-20 | 1986-02-20 | Photometric device for single lens reflex camera |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62192730A true JPS62192730A (en) | 1987-08-24 |
Family
ID=12441925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61035441A Pending JPS62192730A (en) | 1986-02-20 | 1986-02-20 | Photometric device for single lens reflex camera |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62192730A (en) |
-
1986
- 1986-02-20 JP JP61035441A patent/JPS62192730A/en active Pending
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