Focus detector and optical instrument using the same

焦点検出装置及びそれを用いた光学機器

Abstract

(57)【要約】 【課題】 撮影画面又は観察画面上の広い範囲に渡り2 次元的、連続的に複数の領域で焦点検出を可能とする焦 点検出装置及びそれを用いた光学機器を得ること。 【解決手段】 対物レンズの像面側に設けた光学手段に より該対物レンズの瞳の分離した複数の異なる領域を通 過した光束を用いて被写体像に関する複数の光量分布を 形成し、該複数の光量分布の相対的な位置関係を複数の 素子より成る光電変換素子により求め、該光電変換素子 からの信号を用いて該対物レンズの合焦状態を撮影視野 内の1つ又は複数の領域において求める際、該光学手段 は該対物レンズからの光束を反射させて所定面上に被写 体像を形成する集光性の反射鏡Mと、該所定面上に形成 された被写体像を該光電変換素子面上に再結像する2次 結像系を有し、該反射鏡Mは回転対称軸を有しない反射 面より構成していること。
PROBLEM TO BE SOLVED: To obtain a focus detector capable of two dimensionally and continuously detecting a focus in plural areas over a wide range on a photographic screen and an observation screen, and to obtain an optical instrument using the focus detector. SOLUTION: Plural light quantity distributions as to a subject image are formed by using a luminous flux passing through plural different areas separated in the pupil of the objective lens 101 by optical means 4 to 9 installed on the image plane side of the objective lens 101, and the relative positional relation of plural light quantity distributions is obtained by a photoelectric transducing element 11 constituted of plural elements. And, in the case of obtaining the focusing state in one or plural areas in a photographic visual field by using a signal from the photoelectric conversion element 11, the optical means 4 to 9 are provided with a condensing reflection mirror 4 for reflecting the luminous flux from the objective lens 101 so as to form the subject image on a prescribed plane, and a secondary image forming system 9 for forming the subject image formed on the prescribed plane on the surface of the photoelectric transducing element 11 again, and the reflection mirror 4 is constituted of a reflection plane with no rotation symmetrical axis.

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