JPS6036615U

JPS6036615U - camera focus detection device

Info

Publication number: JPS6036615U
Application number: JP12885983U
Authority: JP
Inventors: 敏彦唐崎; 弘向井; 河村　邦夫
Original assignee: ミノルタ株式会社
Priority date: 1983-08-19
Filing date: 1983-08-19
Publication date: 1985-03-13

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は従来から提案されている焦点検出装置の代表的
な光学系を示す図、第２図はこの考案の基本的な実施例
の光学系を示す図、第３図は第２図における一対の再結
像レンズの正面図、第４図は第２図における絞りマスク
の正面図、第５図は絞りマスクの開口を一対の再結像レ
ンズによって撮影レンズの射出瞳内に投影した様子を示
す図、第６図は上記基本的な実施例を一眼レフレックス
カメラに採用した場合の実施例を示す図である。ＴＬ・・・・・・撮影レンズ、Ｌｌ、Ｌ２・・・・・・
再結像レンズ、Ｐ□ｗＰ２・・・・・・第１、第２の受
光素子列、Ｆ・・・・・・予定結像面、Ｍ、、　Ｍ２・
・・・・・絞りマスクＭの一対の絞り開口、ＥＰ・・・
・・・撮影レンズＴＬの射出瞳、Ｄ・・・・・・主ミラ
ー、Ｅ・・・・・・副ミラー、Ｇｌ−−−−−−ミラー
ボックス底壁Ｇに設けた開口。Fig. 1 is a diagram showing a typical optical system of a focus detection device that has been proposed in the past, Fig. 2 is a diagram showing an optical system of a basic embodiment of this invention, and Fig. 3 is a diagram showing a typical optical system of a focus detection device proposed in the past. A front view of a pair of re-imaging lenses, FIG. 4 is a front view of the aperture mask in FIG. 2, and FIG. 5 shows the aperture of the aperture mask projected into the exit pupil of the photographing lens by the pair of re-imaging lenses. FIG. 6 is a diagram showing an embodiment in which the basic embodiment described above is applied to a single-lens reflex camera. TL...Photography lens, Ll, L2...
Re-imaging lens, P□wP2...First and second light-receiving element rows, F...Planned imaging plane, M,, M2.
...Pair of apertures of aperture mask M, EP...
. . . Exit pupil of photographing lens TL, D . . . Main mirror, E .

Claims

[Claims for Utility Model Registration] 1. An image formed by a photographing lens is transferred onto the first and second light-receiving element arrays by a pair of re-imaging lenses, respectively.
A focus detection device for a camera that detects a focus adjustment state of a photographic lens by re-forming the first image as a second image and detecting a change in position of the first and second images using the first and second light receiving elements. , a second light-receiving element array is disposed at a position substantially conjugate with the expected imaging plane of the photographing lens with respect to the pair of re-imaging lenses, and the pair of re-imaging lenses and the first and second light-receiving elements A diaphragm mask having a pair of diaphragm apertures is provided and arranged between the rows, and an image of the pair of diaphragm apertures projected by the pair of re-imaging lenses is included in the exit pupil of the photographing lens. A focus detection device featuring: 2. The above-mentioned camera is a single-lens reflex camera equipped with a main mirror having a light-transmitting part and a sub-mirror that reflects downward a part of the subject light that has passed through the light-transmitting part of the main mirror, and the above-mentioned photographic lens is 2. The focus detection device according to claim 1, wherein the sub-mirror is provided so that a planned image-forming plane is above a bottom wall of a mirror box of the main mirror. 3. The re-imaging lens, the pair of diaphragm apertures, and the first and second light-receiving element arrays are arranged below the bottom wall of the mirror box, and the light reflected by the sub-mirror is formed on the bottom wall of the mirror box. 3. The focus detection device according to claim 2, wherein the focus detection device is configured such that the light enters the re-imaging lens through the aperture.