JPS6096656U

JPS6096656U - Copying machine lens aperture drive device

Info

Publication number: JPS6096656U
Application number: JP18916483U
Authority: JP
Inventors: 信行佐藤
Original assignee: 株式会社リコー
Priority date: 1983-12-09
Filing date: 1983-12-09
Publication date: 1985-07-01

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 drawings]

第１図は公知の変倍複写機の露光々学系の構成の一例を
示す図式図、第２図はその変倍操作のためのレンズ変位
機構の一例を示す平面図、第３図及び第４図は夫々従来
提案されたレンズ絞り駆動装置の一例の展開側面図及び
平面図、第５図は本考案の実施例の平面図である。８・・・レンズ、１５・・・レンズブラケット　（レン
ズと一体に移動する部材）、３０・・・絞りリング（絞
す機構）、３１・・・ステップモータ。FIG. 1 is a schematic diagram showing an example of the configuration of an exposure optical system of a known variable magnification copying machine, FIG. 2 is a plan view showing an example of a lens displacement mechanism for variable magnification operation, and FIGS. 4 is a developed side view and a plan view of an example of a conventionally proposed lens diaphragm driving device, respectively, and FIG. 5 is a plan view of an embodiment of the present invention. 8... Lens, 15... Lens bracket (member that moves together with the lens), 30... Aperture ring (diaphragm mechanism), 31... Step motor.

Claims

[Scope of utility model registration request]

(1) In an aperture drive device for a copying machine lens that moves the position of the lens to change magnification and adjusts the amount of light using an aperture mechanism provided on the lens, the aperture drive device fixes the lens and changes magnification. 1. An aperture drive device comprising: a step motor attached to a member that moves together with a lens; the step motor narrows the aperture to a required aperture diameter.

(2) As a means for narrowing the diaphragm to the required aperture diameter using the step motor described above, the motor is rotated until it reaches the maximum aperture position or the minimum aperture position of the aperture, and when it is detected that the motor is locked at that position, the motor is The diaphragm drive device according to claim 1, wherein the home position is the home position of the diaphragm drive device.

(3) As a means for narrowing down the aperture diameter using the step motor, when the power of the copying machine is turned on, the step motor sends a pulse that rotates the step motor in a fixed direction for more than the number of steps required to change the aperture from the maximum position to the minimum position. The aperture is mechanically stopped at the minimum or maximum aperture position, that position is set as the home position, and the aperture is rotated in the opposite direction by the number of steps required to bring the aperture to the center position. The diaphragm drive device according to claim 1 of the utility model registration claim, characterized in that: