JPS59114526U

JPS59114526U - Focus point detection device for single-lens reflex camera

Info

Publication number: JPS59114526U
Application number: JP684083U
Authority: JP
Inventors: 望北岸
Original assignee: キヤノン株式会社
Priority date: 1983-01-21
Filing date: 1983-01-21
Publication date: 1984-08-02

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 the drawing]

第１図は二次結像光学系を用いる合焦点距離検出装置の
概念的な光路説明図、第２図、第３図は夫々第１図の光
路を組み込んだ一眼レフレタスカメラの従来例の概要図
、第４図、第５図は本考案の異る実施例の概要図、第６
図は第５図の一部の斜視図である。１・・・対物レンズ、３・・・二次結像レンズ、４・・
・光電素子アレー、５・・・フィールドレンズ、６川主
ミラー、７・・・サブミラー、８・・・反射鏡、９・・
・凹面鏡、１０・・・光学部材、１１・・・アーム、１
２・・・長筒。 ′１７（″ ３Fig. 1 is a conceptual optical path explanatory diagram of a focusing distance detection device using a secondary imaging optical system, and Figs. 2 and 3 are illustrations of conventional examples of single-lens reflex lettuce cameras incorporating the optical path shown in Fig. 1, respectively. Schematic diagrams, Figures 4 and 5 are schematic diagrams of different embodiments of the present invention, Figure 6
The figure is a perspective view of a part of FIG. 5. 1... Objective lens, 3... Secondary imaging lens, 4...
・Photoelectric element array, 5...Field lens, 6 Main mirror, 7...Sub mirror, 8...Reflector, 9...
・Concave mirror, 10... Optical member, 11... Arm, 1
2...Long tube. '17(''3

Claims

[Scope of utility model registration request]

A reflective surface that bends the light beam that has passed through the objective lens, which is the photographic lens, downward behind the main mirror of the camera, and a secondary surface that receives the light beam bent by the reflective surface and re-forms the image formed by the objective lens. an imaging lens; a photoelectric conversion element disposed on a reimaging surface by the secondary imaging lens;
A focusing point of a single-lens reflex lettuce camera comprising a refractive member functioning as a field lens provided on the optical axis between the reflecting surface and the secondary imaging lens in order to prevent vignetting of the light beam reaching the dazzling and electrical conversion element. In the detection device, the reflective surface is located immediately in front of the film surface, and the refractive member functioning as the field lens is configured such that its refractive surface is located in the immediate vicinity of the reflective surface and its front axis coincides with the optical axis. A single-lens reflex lettuce camera characterized in that the reflective surface and the refracting member are fixed to each other, and a mechanism is provided for retracting both the reflective surface and the refractive member out of the photographing light beam during photographing. Focus point detection device.