公开(公告)号：US3649120A

公开(公告)日：1972-03-14

申请号：US3649120D

申请日：1970-04-06

Applicant: AGFA GEVAERT AG

Inventor： PFEIFER JOSEPH ,  BICKL HORST

IPC: G03B27/72 ,  G03B27/80 ,  G03B27/76

CPC classification number: G03B27/722 ,  G03B27/80

Abstract: A microfilm copying camera of the step-by-step type which permits adjustment of the ratio of the size of the picture to be taken (the copy) to the size of the picture to be copied (the master or original). The camera is provided with a light source of controllable intensity for illuminating the entire master; the light source is controlled by a photometer mounted on the camera and scanning a small test area of the master. The camera has an adjustable lens board, whereby the size of the copy may be varied. The photometer has a light sensitive element mounted in the plane of the camera film, and a lens which scans the test area which is mounted on the camera lens board and has a focal length equal to the focal length of the camera lens. The camera may have a shutter mechanism with a fixed opening and a constant exposure time, the only variable in the taking of the picture then being the variable illumination provided by the controlled light source.

Abstract translation: 一种逐步式的微缩胶片复印机，它允许调整要拍摄的照片（复印件）的大小与要复制的照片的大小（主人或原件）的比例。 相机设有可控制的光源，用于照亮整个主机; 光源由安装在相机上的光度计控制，并扫描主机的小测试区域。 相机具有可调节的透镜板，由此可以改变复印件的尺寸。 光度计具有安装在照相机胶片平面中的感光元件，以及透镜，其扫描安装在照相机镜头板上并具有与照相机镜头焦距相等的焦距的测试区域。 相机可以具有固定开口和恒定曝光时间的快门机构，拍摄照片的唯一变量是由受控光源提供的可变照明。