JPS63165630U

JPS63165630U -

Info

Publication number: JPS63165630U
Application number: JP5979887U
Authority: JP
Priority date: 1987-04-20
Filing date: 1987-04-20
Publication date: 1988-10-28

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を示すズームフアイ
ンダーのブライトフレーム機構の概略構成図、第
２図は本考案の他の実施例を示す同上機構の概略
構成図、第３図は従来技術を示すズームフアイン
ダーとブライトフレーム機構の概略構成図である
。１，１１……第１のレンズ群、２，１２……第
２のレンズ群、３，１３……第３のレンズ群、５
，１５……フレーム部材、６，１６……反射ミラ
ー、８，１８……ハーフミラー、Ａ……ズームフ
アインダーを覗く方向、Ｉ……ズームフアインダ
ーの光軸、Ｎ……軸心、Ｑ，ＱＡ……入射光の一
部。 Fig. 1 is a schematic diagram of the bright frame mechanism of a zoom finder showing one embodiment of the present invention, Fig. 2 is a schematic diagram of the same mechanism as the above mechanism showing another embodiment of the invention, and Fig. 3 is a diagram of the prior art. FIG. 2 is a schematic configuration diagram of a zoom finder and a bright frame mechanism shown in FIG. 1, 11...first lens group, 2,12...second lens group, 3,13...third lens group, 5
, 15... Frame member, 6, 16... Reflection mirror, 8, 18... Half mirror, A... Direction of looking into the zoom finder, I... Optical axis of zoom finder, N... Axis center, Q, QA ...Part of the incident light.

Claims

[Scope of utility model registration request]

The refractive powers of the lenses are, in order from the external viewing window provided on the subject side for viewing the subject, the first lens group is positive, the second lens group is negative, the third lens group is positive, or the first lens group is positive. The lens group is negative, the second lens group is positive, and the third lens group is negative, and the lens interval between the first lens group and the second lens group, and the second lens In a zoom finder that changes the viewfinder magnification and the size of the subject image by relatively changing the distance between the lens groups and the third lens group, the axis is located behind the second lens group. The zoom finder is arranged so that its center is substantially parallel to the optical axis of the zoom finder, and a part of the incident light from the external viewing window is let in through the first lens group and the second lens group. a frame member, a reflective mirror disposed behind the frame member and configured to change the transmitted light through the frame frame of the frame member toward the third lens group; a reflective mirror disposed in the third lens group; A bright frame mechanism for a zoom finder, comprising a half mirror that reflects light from the mirror in a direction in which the zoom finder is viewed.