JPS5948527U

JPS5948527U - Reverse Galilean type finder

Info

Publication number: JPS5948527U
Application number: JP14530482U
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: 1984-03-31

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) [Abstract] 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図は従来のレンズ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ａ、　　ｂは
本考案の実施例を示す光学系で、互いに直角方向の断面
図である。３０１．３０２，３０３．３０４・・・レンズ、３０５
・・・光束分割器Ｉ、３０８・・・光束分割器■、３０
９・・・凹レンズ、３１０・・・光束分割器■、３１１
・・・凸レンズ、３１２・・・視野枠。Figure 1 shows the finder optical system of a conventional camera using a zoom lens, Figure 2 shows the reverse Galilean-off finder optical system used in a conventional lens-shutter camera, and Figures 3a and b show the optical system of an embodiment of the present invention. FIG. 301.302, 303.304... Lens, 305
... Luminous flux splitter I, 308... Luminous flux splitter ■, 30
9... Concave lens, 310... Luminous flux splitter ■, 311
...Convex lens, 312...Field frame.

Claims

[Scope of utility model registration request]

In an optical device that uses a zoom lens as a photographing optical system, which has a portion where a light beam from an axial direction becomes almost afocal, the light beam from an axial object is directed to the afocal portion, and the optical axis reaches the afocal portion of the zoom lens. A light beam splitter 1 is provided to split the beam in the vertical direction, a part of the incident light beam is bent by the light beam splitter 1, and a lens system after the afocal part of the zoom lens is provided in the light beam to create an imaging system. At least one concave lens is provided in the beam passing through the beam splitter 1 in the same direction as the optical axis up to the afocal portion of the zoom lens, and the lens system up to the afocal portion of the zoom lens and the concave lens The objective lens is a component lens system, one convex lens is provided behind the concave lens, and the convex lens is used as an eyepiece. The diameter of the lens is made large so that the light flux of
between the beam splitter 1 and the concave lens so that the beam passing outside the semi-transparent portion is perpendicular to the optical axis up to the afocal portion of the zoom lens. A bending mirror is provided, and a beam splitter 2 is provided between the beam splitter 1, the concave lens, and the mirror to bend a part of the beam from the mirror in the same direction as the optical axis up to the afocal portion of the zoom lens. , a beam splitter 3 is provided between the concave lens and the convex lens so that the image of the light beam passing through the semi-transparent part of the light beam splitter 1 and the image of the light flux passing outside the semi-transparent part can be seen to match. A reverse Galilean-off finder with a field frame capable of focusing, characterized in that a field frame is provided so that the image passes through the beam splitter 3 and matches the diopter of the eyepiece.