JPS597441U

JPS597441U - Copy machine variable magnification optical device

Info

Publication number: JPS597441U
Application number: JP10050282U
Authority: JP
Inventors: 根来　育生
Original assignee: 旭光学工業株式会社
Priority date: 1982-07-02
Filing date: 1982-07-02
Publication date: 1984-01-18
Also published as: JPH0320826Y2

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図は複写倍率の変更に伴うズームレンズの移動軌跡
および本考案の原理を説明するレンズの移動状態図、第
２図は第１図から第ルンズ群の移動軌跡および近似直線
のみを取り出したレンズの移動軌跡線図、第３図は本考
案に係る複写機の変倍光学装置の実施例を示す平面図、
第４図は同要部の斜視図である。Ｅ、　Ｅ’・・・・・・近似直線、１・・・・・・ズー
ムレンズ、Ａ、　Ｂ・・・・・・可動レンズ群、２・・
・・・・案内棒、５・・・・・・ズームレンズ架台、７
・・・・・・ガイドレール、８・・・・・・第１鏡筒、
９・・・・・・第２鏡筒、１６・・・・・・カム板、１
７・・・・・・カムフォロア。゛Figure 1 shows the movement trajectory of the zoom lens as the copying magnification changes, and a diagram of the movement of the lens to explain the principle of the present invention. Figure 2 shows only the movement trajectory and approximate straight line of the lens group taken from Figure 1. FIG. 3 is a plan view showing an embodiment of the variable magnification optical device for a copying machine according to the present invention;
FIG. 4 is a perspective view of the main parts. E, E'...Approximate straight line, 1...Zoom lens, A, B...Movable lens group, 2...
...Guide rod, 5...Zoom lens mount, 7
...Guide rail, 8...First lens barrel,
9...Second lens barrel, 16...Cam plate, 1
7...Cam follower.゛

Claims

[Scope of utility model registration request]

(1) A zoom lens that changes the copying magnification by moving in the optical axis direction is disposed between the document surface and the photoreceptor, and the image of the edge of the document surface is always aligned with the edge of the photoreceptor. In a variable magnification optical device of a copying machine, the optical axis of a movable lens group of one of the zoom lenses is moved simultaneously in a direction perpendicular to the optical axis as the magnification is changed so that an image is formed on the optical axis. A variable magnification optical system for a copying machine, characterized in that a composite movement locus of directional movement and movement in a direction perpendicular to this is approximated by a straight line, and a guide means is provided for moving the entire zoom lens along this approximated straight line. Device. , (2) Utility model registration In claim 1, the zoom lens has at least two movable lens groups: a lens group with a positive focal length and a lens group with a negative focal length, and the zoom lens has a focal length of the above pressure. A variable magnification optical device for a copying machine in which a synthetic movement locus of a lens group having a lens group is approximated by a straight line.