JPS593733B2 - Ichigun reflex camera no. - Google Patents

Description

【発明の詳細な説明】 ０ 本発明は、２つの模型プリズムにより被写体像を上
、下或は左、右等に分割して、焦点合致時には、該分割
像が分割境界面で一致することを利用して焦点検出を行
う焦点検出装置の改良に関する。[Detailed Description of the Invention] 0 The present invention divides a subject image into upper, lower, left, right, etc. parts using two model prisms, and ensures that the divided images coincide at the dividing boundary plane when the images are brought into focus. The present invention relates to an improvement in a focus detection device that performs focus detection using the present invention.

本発明は、模型プリズムにより上下、或は左右５ に分
割された被写体像が焦点合致時に於いて分割境界面で該
像が一致する原理に基づき焦点検出を行うもので、同一
の光電変換素子群の配線を切り換えることによつて異な
る焦点検出方式を併用し、より高精度な焦点検出を行う
一眼レフカメラの焦００点検出装置を提供せんとするも
のである。以下、図面に従つて本発明の一実施例につい
て説明して行く。第１図は、一眼レフカメラの光学系の
構成図で本発明に係る焦点検出装置を有している状態を
示５ している。The present invention performs focus detection based on the principle that when a subject image divided into 5 parts vertically or horizontally by a model prism is brought into focus, the images coincide at the dividing boundary surface, and the same photoelectric conversion element group It is an object of the present invention to provide a focus 00 point detection device for a single-lens reflex camera that performs focus detection with higher precision by using different focus detection methods together by switching the wiring. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of the optical system of a single-lens reflex camera, showing a state in which it has a focus detection device according to the present invention.

図に於いて１、１’は被写体、２は撮影光学系を構成す
るレンズ群、３は中央部のハーフミラー ３’を有する
全反射ミラー、４は全反射ミラー３の裏面中央に取り付
けられた全反射ミラー、５は焦点板、６はコンデンサー
レンズ、Ｔはペン０ タプリズム、８はアイピース、９
は撮影者等の目である。１０はフィルム、１１、１１’
は互に反射力向に傾斜した模型プリズム、１２はフィル
ム１０と光学的に等価な位置を示す中心線（以後、水平
中心線と呼ぶ）、１３は被写体１、丁の像を”５ 光電
変換素子群１４上に結像させるためのレンズ、ｄｌ、ｄ
２・・・・・・・・・ｄｎ、ｄｌ’、ｄ２’・・・・・
・・・・ｄｎ’は光電変換素子群１４を構成する微小光
電変換素子、１５は光電変換素子群１４の出力を処理し
て、焦点検出を行う焦点検出装置であり、詳細は後で示
す。In the figure, 1 and 1' are the subject, 2 is the lens group that makes up the photographic optical system, 3 is a total reflection mirror with a half mirror 3' in the center, and 4 is attached to the center of the back surface of the total reflection mirror 3. Total reflection mirror, 5 is focusing plate, 6 is condenser lens, T is pen prism, 8 is eyepiece, 9
is the eye of the photographer, etc. 10 is film, 11, 11'
12 is a center line (hereinafter referred to as the horizontal center line) indicating a position optically equivalent to the film 10, and 13 is the image of the subject 1, ``5'' photoelectric conversion. Lenses for forming an image on the element group 14, dl, d
2...dn, dl', d2'...
. . . dn' is a minute photoelectric conversion element constituting the photoelectric conversion element group 14, and 15 is a focus detection device that processes the output of the photoelectric conversion element group 14 and performs focus detection, details of which will be described later.

第２図は光電変換累子群１４の詳細図で、水平中心線１
２を境として、微小光電変換素子のＤ，とＤｌ７，ｄ２
とＤ２′，・・・・・・・・・，Ｄｎ（５ｄｎ７が夫々
並列に対になつていることを示す（もちろん各素子の電
気的特性及び受光面積等は等しい）。FIG. 2 is a detailed diagram of the photoelectric converter group 14, with the horizontal center line 1
2 as the boundary, D of the microphotoelectric conversion element, and Dl7, d2
and D2', .

第３図は、２つの互に反対方向に傾斜した楔型プリズム
１１，１１１と光電変換素子群１４との関係を表わし、
イは焦点の合致がなされない時、口はなされた時の夫々
の光電変換素子群１４上の被写体像を示す。尚、１６，
１６１は、被写体像を示し、被写体１，Ｖとは、１と１
６，Ｖと１６′が対応している。更に、第１図から第３
図に示される一眼レフカメラの光学系を光電変換素子群
との関係を簡単に説明する。FIG. 3 shows the relationship between two wedge-shaped prisms 11, 111 tilted in opposite directions and the photoelectric conversion element group 14,
A shows the subject image on the photoelectric conversion element group 14 when the focus is not matched and when the mouth is closed. Furthermore, 16,
161 indicates a subject image, and subject 1 and V refer to 1 and 1.
6, V and 16' correspond. Furthermore, Figures 1 to 3
The relationship between the optical system of the single-lens reflex camera shown in the figure and the photoelectric conversion element group will be briefly described.

撮影光学系を構成するレンズ群２により、被写体像１及
び１！は、全反射ミラー３の中央部のハーフミラー３７
を通り、全反射ミラー４で反射されて、フイルム１０と
光学的に等価な位置にある水平中心線１２をもつた互に
反対方向に傾斜した２つの楔型プリズム１１及び１『の
近辺に像を結ぶ。該像は、この互に反対方向に傾斜した
２つの楔型プリズム１１及び１１７によつて２分割され
、その夫々は結像レンズ１３により１対の光電変換素子
群１４上に結像されるが、第２図の如く、光電変換素子
群１４と水平中心線１２とは対になつている微小光電変
換素子の中央と光学的に一致している。Subject images 1 and 1! are captured by the lens group 2 that constitutes the photographic optical system. is the half mirror 37 at the center of the total reflection mirror 3
is reflected by the total reflection mirror 4, and an image is formed in the vicinity of two wedge-shaped prisms 11 and 1' tilted in opposite directions and having a horizontal center line 12 located at an optically equivalent position to the film 10. Tie. The image is divided into two by the two wedge-shaped prisms 11 and 117 tilted in opposite directions, and each is imaged onto a pair of photoelectric conversion element groups 14 by the imaging lens 13. As shown in FIG. 2, the photoelectric conversion element group 14 and the horizontal center line 12 optically coincide with the center of the paired microphotoelectric conversion elements.

従つて、撮影光学系を構成するレンズ群２の矢印方向へ
の移動により、第３図のイの如く撮影レンズ群２による
被写体像１，１７が、第１図の水平中心線１２土に結像
されない場合は、互に反対方向に傾斜した２つの楔型プ
リズム１１，１１′と結像レンズ１３の動きにより、光
電変換素子群１４上には、水平中心線（対に゛なつてい
る光電変換素子群１４の中心線と一致している。Therefore, by moving the lens group 2 constituting the photographing optical system in the direction of the arrow, the subject images 1 and 17 formed by the photographing lens group 2 are focused on the horizontal center line 12 in FIG. 1, as shown in FIG. 3A. When no image is formed, the movement of the two wedge-shaped prisms 11, 11' tilted in opposite directions and the imaging lens 13 causes the horizontal center line (paired photoelectric converters) to appear on the photoelectric conversion element group 14. It coincides with the center line of the conversion element group 14.

）１２を境としてずれて結像する。尚、第１図の水平中
心線１２上に結像した場合は、第３図口の如く光電変換
素子群１４上には水平中心線１２を境として一致した像
を結像する。)12 as a boundary and the image is formed with a shift. Note that when an image is formed on the horizontal center line 12 in FIG. 1, an image that coincides with the horizontal center line 12 as a boundary is formed on the photoelectric conversion element group 14 as shown in the opening in FIG.

次に、本発明に係る焦点検出装置の要旨を説明する前に
第４図、第７図によつて光学的に分割された像を電気的
に検出し焦点検出を行う力式をまず説明する。第４図は
、焦点検出力式に使用される光電変換素子１４の配線図
で、光電変換素子１４の各微小光電変換素子ｄ１〜Ｄｎ
，ｄｌ′〜Ｄｎ７の受光面が水平中心線１２と直角な方
向に充分小さい場合、第３図口の如く被写体像１６，１
６′が水平中心線１２を境として一致した状態では、対
になつた各微小光電変換素子には等しい光量が入射する
と考えて差支えない。Next, before explaining the gist of the focus detection device according to the present invention, the force formula for electrically detecting the optically divided image and detecting the focus will be explained as shown in FIGS. 4 and 7. . FIG. 4 is a wiring diagram of the photoelectric conversion element 14 used in the focus detection power type, and each minute photoelectric conversion element d1 to Dn of the photoelectric conversion element 14 is
, dl' to Dn7 are sufficiently small in the direction perpendicular to the horizontal center line 12, the subject images 16, 1 as shown in the opening of FIG.
6' coincide with each other with the horizontal center line 12 as a boundary, it can be considered that the same amount of light is incident on each pair of minute photoelectric conversion elements.

この様な構成に於いて、第４図の如く対になつている微
小光電変換素子ｄ１のアノードとＤｌ７のカソード、Ｄ
２のアノードとＤ２′のカソード、・・・・・・・・・
ＤｎのアノードとＤｎｌのカソードという様に互に逆方
向に並列に配線すれば、各端子１，２，３，・・・・・
・・・・ｎとコモン端子Ｃとの間には、微小光電変換素
子間の出力差１１−１，７１２−１２′，Ｉ３−１３′
，・・・・・・・・・Ｉｎ−１ｎ！が得られる。よつて
第３図イの場合には、被写体像１６，１６７の移動によ
つて、微小光電変換素子ＤｋとＤｋ′部及びＤｍ（５ｄ
ｍ７部とで出力の差が生じる。（但し、１≦Ｋ，ｍくｎ
、また、被写体像以外では水平中心線１２を境として近
辺の照度は等しいものとする。）この場合、第４図のア
ノード端子１，２，・・・・・・・・・ｎの出力の絶対
値の総和をεとすると、で示される。また、第３図口の
如く被写体像１６，１６′が第１図の水平中心線１２上
に結像した場合（もちろんこの場合は焦点合致時を示し
ている）には、前述の如く被写体像１６，１６′に対応
している微小光電変換素子ＤｓとＤｓ７の出力差はＯと
なるから、上記の値はよつて、焦点合致時においては該
出力εは最小値０となる。In such a configuration, as shown in FIG. 4, the anode of the minute photoelectric conversion element d1 and the cathode of Dl7, D
2 anode and D2' cathode,...
If the anode of Dn and the cathode of Dnl are wired in parallel in opposite directions, each terminal 1, 2, 3, etc.
... between n and common terminal C, there are output differences between minute photoelectric conversion elements 11-1, 712-12', I3-13'
,...In-1n! is obtained. Therefore, in the case of FIG.
There is a difference in output between the m7 section and the m7 section. (However, 1≦K, m×n
In addition, except for the subject image, the illuminance in the vicinity of the horizontal center line 12 is assumed to be equal. ) In this case, if ε is the sum of the absolute values of the outputs of the anode terminals 1, 2, . . . n in FIG. In addition, when the subject images 16, 16' are formed on the horizontal center line 12 in FIG. 1 as shown in the opening of FIG. Since the output difference between the minute photoelectric conversion elements Ds and Ds7 corresponding to the photoelectric conversion elements 16 and 16' is O, the above value is accordingly, and the output ε becomes the minimum value 0 at the time of focusing.

第５図は、上述の第４図とはまた別の焦点検出方式に使
用される光電変換素子１４の配線図で、各隣り合つた微
小光電変換素子が各端子１，３，５蟹１１１１ｎ） １
′ツ２！リ４１ｔ６′９＊″″３６０３ｎ一１′と共通
コモン端子Ｃ７間で互に逆方向で並列に接続されて、各
微小光電変換素子間の出力差、１１． ．
． ．
． ． ′一１２９１３
−１４！゜゜゜゜゜゜゜゜゛１ｎ−２−１ｎ−１） １
２−Ｉ３′，Ｉ４′−１５′，・・・・・・・・・Ｉｎ
−１″−１ｎ！を各端子と共通コモン端子Ｃ！間で得る
様になつている。FIG. 5 is a wiring diagram of a photoelectric conversion element 14 used in a focus detection method different from that shown in FIG. 1
'Tsu 2! 41t6'9*''''3603n-1' and the common common terminal C7 are connected in parallel in opposite directions, and the output difference between each microphotoelectric conversion element is determined by 11. ．．
．． ．．
．． ．． '112913
-14!゜゜゜゜゜゜゜゜゛1n-2-1n-1) 1
2-I3', I4'-15', ......In
-1''-1n! is obtained between each terminal and the common common terminal C!.

（尚、第７図では素子数を奇数個と設定してある。）従
つて、第３図のイ，口に於て、被写体像１６，１６７は
、焦点合致が成されている口の状態は、イの状態に比べ
て鮮明となるから、イに於ける微小光電変換素子Ｄｎｌ
−１〜Ｄｍ或はＤｒｎ−Ｄｎｌ＋１或はＤｋ−／〜Ｄｋ
ノ或はＤｋ′〜Ｄｋ＋１７間の隣り合つた素子の出力差
１ｍ１″ＩｍｉｉｍＰ′Ｉｍ＋Ｄ ′Ｉｋ−
１ 〜Ｉｋ７，ｉｋ！〜Ｉｋ＋１′に比べ、口に於ける
Ｄｓ−１〜Ｄ，或はＤ８〜Ｄ８＋１或はＤ８−１（〜Ｄ
８′，Ｄ８′〜Ｄ８＋，７間の隣り合つた素子の出力差
１ｓ−Ｒｉｓ倉ＩｓＰ′Ｉｓ＋１ｙｉｓ−１！５１８！
，Ｉ８！〜Ｉ８＋１７の力が大きく、結局一般的な像に
対し、該出力の絶対値の総和をとした場合、素子の配列
が第５図に従えばの値は、焦点合致時では最大値を示す
ことになる。(The number of elements is set to an odd number in FIG. 7.) Therefore, in FIG. is clearer than the state in A, so the minute photoelectric conversion element Dnl in A is
-1~Dm or Drn-Dnl+1 or Dk-/~Dk
Or, the output difference between adjacent elements between Dk' and Dk+17 is 1 m1''ImiimP'Im+D'Ik-
1 ~Ik7,ik! 〜Ik+1′, Ds−1〜D in the mouth, or D8〜D8+1 or D8−1(〜D
Output difference between adjacent elements between 8', D8' and D8+, 7 1s-RisP'Is+1yis-1!518!
,I8! ~The force of I8+17 is large, and when the sum of the absolute values of the outputs is taken as the sum of the outputs for a general image, the value when the element arrangement follows FIG. 5 shows the maximum value when in focus. become.

勿論の如く光電変換素子群１４の一方のみを用いてもよ
く、絶対値をｐ乗し、ｐが大きい程焦点合致時附近が先
鋭になることは言うまでもない。Of course, only one side of the photoelectric conversion element group 14 may be used, and it goes without saying that the absolute value is raised to the power of p, and the larger p is, the sharper the area near the time of focusing becomes.

第６図は、本発明に係る一眼レフカメラの焦点検出装置
を示すもので、上述の第４図に示される検出力式と第７
図に示される検出方式とを併用できるものである。FIG. 6 shows a focus detection device for a single-lens reflex camera according to the present invention, in which the detection power formula shown in FIG.
This can be used in combination with the detection method shown in the figure.

スイツチ群２７，２８及び２９は、総てのスイツチが接
点ア側か或はイ側に接続される様に匍脚されており、ア
側に接続される場合には、第４図に示される検出力式が
用いられる。The switch groups 27, 28, and 29 are mounted so that all the switches are connected to the contacts A side or B side, and when connected to the A side, the switches shown in FIG. A power formula is used.

即ち、スイツチ群２７及び２８がア側に接続されること
により、対になつた微小光電変換素子の出力の差が並列
入力直列出力変換回路１７に並列入力され、出力をＩ，
〜Ｉｌ７，ｉ２〜Ｉ２′ ・・・・・・・・・Ｉｎ−１
ｎ！の順でスイツチ２９のア側の絶対値回路１８に入力
する。That is, by connecting the switch groups 27 and 28 to the A side, the difference between the outputs of the paired microphotoelectric conversion elements is input in parallel to the parallel input serial output conversion circuit 17, and the outputs are input to I,
〜Il7, i2〜I2′ ......In-1
n! are input to the absolute value circuit 18 on the A side of the switch 29 in this order.

その結果、絶対値回路１８にょり１１１− １１７１，
１ｉ２−１２′１，・・・・・・・・・１１ｎ−１ｎ７
１の順で出力が生じ、加算回路１９に順次入力されて、
その出力によりｎ Σ １ｉｑ−１ｑ′ｌが得られる。As a result, the absolute value circuit 18 111-1171,
1i2-12'1, 11n-1n7
Outputs are generated in the order of 1, and are sequentially input to the adder circuit 19,
The output yields n Σ 1iq-1q'l.

ｑ＝１ この出力を反転及びシフトアツプ回路２２によｎり、ｏ
− Σ １ｉｑ−１ｑ１Ｉ〉０を得て一時ｑ＝１記憶回
路２３に記憶させる。q=1 This output is inverted and shifted up by the circuit 22.
- Obtain Σ 1iq-1q1I>0 and temporarily store it in the q=1 storage circuit 23.

この回路２２の動作を次に記す。The operation of this circuit 22 will be described below.

該反転及びシフトアツプ回路２２の動作は、第７図イに
示す如く加算回路１９の出力（ａ線で示す）を反転させ
て適当な値。The operation of the inversion and shift-up circuit 22 is as shown in FIG.

（〉０）またシフトアツプして（ｂ線で示す）最小値を
最大値に変換する回路である。一時記憶回路２３に該出
力が記憶されると同時に各スイツチはイ側に接続される
。イ側に接続される場合には、第５図に示される検出方
式が用いられる。即ち、スイツチ群２７及び２８がイ側
に接続されることにより、隣り合つた微小光電変換素子
の出力差（第６図に於いては一方の素子群を用いた構成
を示す）が、並列入力直列出力変換回路１７に入力され
、スイツチ２９によりイ側の絶対値回路１８及び累乗回
路２４及び加算回路１９等により出力Ｎｉ２ｌｌ２，−
１−１２，１Ｐを得る。(>0) This is a circuit that also shifts up and converts the minimum value (indicated by line b) to the maximum value. At the same time that the output is stored in the temporary storage circuit 23, each switch is connected to the A side. When connected to the A side, the detection method shown in FIG. 5 is used. That is, by connecting the switch groups 27 and 28 to the A side, the output difference between adjacent microphotoelectric conversion elements (FIG. 6 shows a configuration using one element group) can be adjusted to the parallel input. The input is input to the serial output conversion circuit 17, and the switch 29 causes the A side absolute value circuit 18, exponentiation circuit 24, adder circuit 19, etc. to output Ni2ll2, -.
1-12, 1P is obtained.

（但し、ｑ＝１ｐは累乗回路２４により定めた定数で１
，２，・・・・・・・・・の値を示す０）該出力と前記
一時記憶装置２３に記憶されていた出力とを乗算回路２
５により合成して最大値検出回路２６に入力し最大値を
求める。(However, q=1p is a constant determined by the exponentiation circuit 24 and is 1
, 2, . . . 0) which indicates the value of
5 and input it to the maximum value detection circuit 26 to obtain the maximum value.

尚、最大値即ち焦点合致時には発光ダイオード等の発光
素子２１を働かせて焦点合致時を撮影者に知らせること
は勿論であるが、該出力を利用して自動焦点検出に応用
できるのは当然である。当然ながらｐがｉの場合は、累
乗回路２４は必要がなく、またｐが偶数の場合は、絶対
値回路１８は必要がない。Of course, when the maximum value is reached, that is, when the focus is met, the light emitting element 21 such as a light emitting diode is activated to notify the photographer when the focus is met, but it is also natural that the output can be used to apply to automatic focus detection. . Naturally, when p is i, the exponentiation circuit 24 is not necessary, and when p is an even number, the absolute value circuit 18 is not necessary.

勿論絶対値回路及び加算回路等を共用してもさしつかえ
ない。第７図の口のｂは一時記憶回路２３の出力、ｃは
スイツチがイ側に接続された場合のイ側の加算回路１９
の出力、及びｄは乗算回路２５の出力を示すが、図より
明らかな様に２つの焦点検出力式を併用した力が、より
焦点合致附近で出力を先鋭となり検出精度は上がる。Of course, the absolute value circuit, the adder circuit, etc. may be shared. In Fig. 7, b is the output of the temporary memory circuit 23, and c is the addition circuit 19 on the A side when the switch is connected to the A side.
and d indicate the output of the multiplier circuit 25. As is clear from the figure, the combined use of the two focus detection force formulas sharpens the output near the focal point, improving detection accuracy.

この様に本焦点検出装置によれば異なる焦点検出力式に
よつて合焦状態を検知する機構を併用し、該機構を切り
換えるのと同調してそれにあうように１つの微小光電変
換素子群の配線の切り換えることにより異なる原理の焦
点検出方式を併用して焦点検出を行うことが可能となつ
たものであり、より高精度で、小さく、簡単な装置での
焦点検出が可能となり、その効果は極めて大きい。In this way, according to the present focus detection device, mechanisms for detecting the in-focus state using different focus detection power formulas are used together, and one microphotoelectric conversion element group is switched in synchronization with the switching of the mechanisms. By switching the wiring, it is now possible to perform focus detection by using focus detection methods based on different principles, making it possible to perform focus detection with higher precision, smaller and simpler equipment, and the effect is Extremely large.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明の実施例を示す一眼レフカメラの光学系
の構成図、第２図は光電変換素子群の配置図、第３図の
イはピットのずれた場合の光電変換素子群上の被写体像
の図、第３図の口はピットの合つた場合の光電変換素子
群上の被写体像の図、第４図は微小光電変換素子の配線
図、第５図は微小光電変換素子の配線図、第６図は焦点
検出処理装置のプロツク図、第７図イ，口は焦点ずれ量
と焦点検出出力との関係図。 １，『・・・・・・被写体像、２・・・・・・撮影光学
系を構成するレンズ群、３・・・・・・全反射ミラー、
３！−・・・・・ハーフミラー、４・・・・・・全反射
ミラー、５・・・・・・焦点板、６・・・・・・コンデ
ンサーレンズ、７・・・・・・ペンタプリズム、８・・
・・・・アイピース、９・・・・・・撮影者等の目、１
０・・・・・・フイルム、１１，１１！−・・・・・楔
型プリズム、１２・・・・・・水平中心線、１３・・・
・・ルンズ、１４・・・・・・光電変換素子群、ｄ１〜
Ｄｎ，ｄ／〜Ｄｎζ・・・・・微小光電変換素子、１５
・・・・・・焦点検出処理装置、１６，１６く・・・・
・被写体像。Fig. 1 is a configuration diagram of the optical system of a single-lens reflex camera showing an embodiment of the present invention, Fig. 2 is a layout diagram of a group of photoelectric conversion elements, and A in Fig. 3 is a diagram of a group of photoelectric conversion elements when the pits are shifted. Figure 3 shows the image of the subject on the photoelectric conversion element group when the pits match, Figure 4 shows the wiring diagram of the micro photoelectric conversion element, and Figure 5 shows the wiring diagram of the micro photoelectric conversion element. 6 is a block diagram of the focus detection processing device, and FIG. 7A is a diagram showing the relationship between the amount of defocus and the focus detection output. 1, ``...Subject image, 2... Lens group constituting the photographing optical system, 3... Total reflection mirror,
3! -...Half mirror, 4...Total reflection mirror, 5...Focal plate, 6...Condenser lens, 7...Penta prism, 8...
...Eyepiece, 9...Eye of the photographer, etc., 1
0...Film, 11, 11! -...Wedge-shaped prism, 12...Horizontal center line, 13...
...Luns, 14...Photoelectric conversion element group, d1~
Dn, d/~Dnζ...Minute photoelectric conversion element, 15
...Focus detection processing device, 16, 16...
・Subject image.

Claims (1)

【特許請求の範囲】[Claims] １ 一眼レフカメラの跳上全反射ミラーの光軸上の中央
部をハーフミラーとし、そこを通過した結像光を下部へ
屈曲反射させる小全反射ミラーを跳上ミラーの背後に取
付け、その反射光軸上のフィルム面と等価な面に水平線
方向に互に反射傾斜した２つの楔型プリズムを置き、そ
の背後に結像レンズと前記楔型プリズムの水平中心線と
光学的に一致する境界線を挾んで対をなして両側に並列
させた微小光電変換素子群を配置した一眼レフカメラに
おいて、上記微小光電変換素子群の対向素子間の相対出
力の差の絶対値の総和を検出し極値を以て合焦を検知す
る手段と上記微小光電変換素子群の一方、或は両方の隣
り合つた素子の入射光量に比例した出力の差の絶対値の
（２ｎ−１）乗（但しｎ＝１、２、３・・・・・・・・
・）或は該出力差の２ｎ乗（但しｎ＝１、２、３・・・
・・・・・・）の総和を検出し、最大値を以て合焦を検
知する手段とを併設し、上記二つの検出手段の切り換え
に合わせて、上記一対の微小光電変換素子群の配線を切
り換え、一つの微小光電変換素子群で異なる焦点検出方
式を併用して焦点検出を行なうことを特徴とする一眼レ
フカメラの焦点検出装置。1 The central part of the flip-up total reflection mirror of a single-lens reflex camera on the optical axis is a half mirror, and a small total reflection mirror that bends and reflects the imaged light passing through it to the bottom is attached behind the jump mirror. Two wedge-shaped prisms that are tilted to reflect each other in the horizontal direction are placed on a plane equivalent to the film plane on the optical axis, and behind them are an imaging lens and a boundary line that optically coincides with the horizontal center line of the wedge-shaped prisms. In a single-lens reflex camera in which a group of micro photoelectric conversion elements are arranged in parallel on both sides in a pair with the micro photoelectric conversion element group in between, the sum of the absolute values of the relative output differences between opposing elements of the micro photoelectric conversion element group is detected and the extreme value is determined. (2n-1) power of the absolute value of the difference in output proportional to the amount of incident light between the means for detecting focus and one or both adjacent elements of the microphotoelectric conversion element group (where n=1, 2, 3...
) or the 2n power of the output difference (where n=1, 2, 3...
. . . ), and a means for detecting focus based on the maximum value, and in accordance with the switching of the two detection means, the wiring of the pair of microphotoelectric conversion element groups is switched. A focus detection device for a single-lens reflex camera, characterized in that focus detection is performed using different focus detection methods in one microphotoelectric conversion element group.