JPS5951334U

JPS5951334U - Reverse Galilean type finder

Info

Publication number: JPS5951334U
Application number: JP14530982U
Authority: JP
Inventors: 石山　唱蔵
Original assignee: コニカ株式会社
Priority date: 1982-09-25
Filing date: 1982-09-25
Publication date: 1984-04-04

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図はズームレンズを用いた従来カメラのファインダ
光学系、第２図？１従来のシャッタカメラに用いられる
逆ガリレオフアインダ光学系、第３図は本考案の実施例
を示す光学系で、第３図ａおよび第３図すは同一実施例
につき互いに直角方向の断面図を示す。３０１．３０２，３０３．３０４・・・・・・アフォー
カル部分までのレンズ系、３０５・・・・・・光束分割
器Ｌ　　３０８，３１２・・・・・・凹レンズ、３１１
・・・・・・ミラー、３１３・・・・・・視野枠、３１
５・・・・・・レンズ系、Ｌ・・・・・・基線長。Figure 1 shows the finder optical system of a conventional camera using a zoom lens, and Figure 2? 1. An inverted Galilean off-finder optical system used in a conventional shutter camera. Fig. 3 shows an optical system showing an embodiment of the present invention. Fig. 3a and Fig. 3 are cross-sectional views of the same embodiment taken in a direction perpendicular to each other. shows. 301.302, 303.304... Lens system up to the afocal part, 305... Luminous flux splitter L 308, 312... Concave lens, 311
...Mirror, 313...Field frame, 31
5... Lens system, L... Base length.

Claims

[Scope of utility model registration request]

(1) In an optical device whose imaging optical system is a zoom lens that has a portion where the light beam from the axis is almost afocal, the light beam of the axial object color is sent to the afocal portion to the afocal portion of the zoom lens. A beam splitter 1 is provided to split the beam in a direction perpendicular to the optical axis of the zoom lens, and a part of the incident beam is bent by the beam splitter 1, and a lens system after the afocal portion of the zoom lens is provided in the beam. a photographing system, at least one concave lens is provided in the light beam passing through the beam splitter 1 in the same direction as the optical axis direction up to the afocal part of the zoom lens, and the lens system up to the afocal part of the zoom lens A composite lens system with the concave lens is used as an objective lens, at least one convex lens is provided behind the concave lens, the convex lens is used as an eyepiece, and between the concave lens and the convex lens there is provided a light beam for distance measurement and a field frame. A beam splitter 2 is provided to guide a beam of light to the eyepiece lens, and a mirror is provided at a position separated from the beam splitter 2 by a base line length in a direction perpendicular to the optical axis up to the afocal portion of the zoom lens. , the angle of the mirror changes in conjunction with focusing of the zoom lens; a concave lens for distance measurement is provided between the mirror and the beam splitter 2; The objective lens of the system is characterized in that a viewing rainbow frame is provided between the mirror and the beam splitter 2 through the beam splitter 2 at a position where the image matches the diopter of the objective lens. Reverse Galilean finder with high focusing accuracy.

(2) Utility model registration claim 1, characterized in that a lens system having the same zooming effect as the lens system up to the afocal portion of the zoom lens is provided between the mirror and the concave distance-measuring lens. Reverse Galilean type finder as described in section.