公开(公告)号：US3971929A

公开(公告)日：1976-07-27

申请号：US571985

申请日：1975-04-28

申请人： John Buckland Erdell

发明人： John Buckland Erdell

IPC分类号： F21V9/00 ,  F21V11/18 ,  G03D17/00 ,  F21L15/04

CPC分类号： F21L15/04 ,  F21V11/18 ,  F21V9/00 ,  G03D17/00

摘要： The invention comprises a darkroom safelight having (a) a light filter consisting of negative color film which has been exposed to a white light source (such as a generally continuous, uninterrupted light-reflective surface illuminated by white light) and then developed with color developer, and (b) at least two color filters selected from the colors of magenta, cyan and yellow. The minimum densities of these color filters are determined by the work-fogging factor; the maximum densities are determined by the factor of visual illumination of the work area.

摘要翻译： 本发明包括暗室安全灯，其具有（a）由已经暴露于白色光源（例如由白光照亮的大致连续的不间断的光反射面））的负色膜组成的滤光器，然后用彩色显影剂 ，和（b）从品红色，青色和黄色的颜色中选择的至少两种滤色器。 这些滤色片的最小密度由工作雾化因子决定; 最大密度由工作区域的视觉照明因数决定。