公开(公告)号：US3685900A

公开(公告)日：1972-08-22

申请号：US3685900D

申请日：1970-02-12

Applicant: KMS IND INC

Inventor： KIRBY HERBERT D ,  NEARHOOF GEORGE L ,  CULLER JIMMIE GLENN

IPC: G01J1/04 ,  G01J1/42 ,  G03B27/73 ,  G03B27/76

CPC classification number: G02B26/007 ,  G01J1/0492 ,  G01J1/4214 ,  G03B27/73

Abstract: Calculator for determining proper exposure times in making color prints from color negative films comprises an opaque mask with three series of windows having respectively blue, green and red filters of graduated density. The windows have double wedge shape to provide contiguous points and other points remote therefrom. Color print paper is test exposed to light passing through the negative, a diffusion filter, and the graduated filters; when the paper is developed, the correct exposure time is indicated on the paper by the faintest double wedge image which has sharply defined points. A filter device for use in conjunction with the calculator comprises a wheel rotatably mounted on the lens barrel of a projector and having a series of openings: one clear for focusing, one with a diffusion filter for the test exposure, and the others with blue, green, and red filters respectively.

Abstract translation: 用于确定从彩色底片制作彩色印刷品的适当曝光时间的计算器包括具有三个系列窗口的不透明掩模，分别具有分级密度的蓝色，绿色和红色滤色器。 窗户具有双楔形形状以提供邻近点和远离其的点。 彩色打印纸被测试暴露于穿过负片的光，扩散滤光片和刻度滤光片; 当纸张被开发时，正确的曝光时间在纸上由最明显的双楔形图像指示，其具有明确的界定点。