直接正性卤化银成像体系的形成要素及调控方法  

Some Forming Factors and Controlling Methods in Direct Positive Silver Halide Imaging System

作　　者：吴坚平[1] 庄思永[1] 黄德音[1] 

机构地区：[1]华东理工大学精细化工研究所,上海交通大学应用化学系

出　　处：《华东理工大学学报（自然科学版）》1995年第4期465-470,共6页Journal of East China University of Science and Technology

基　　金：国家自然科学基金

摘　　要：研究了直接正性照相乳剂性能改善的调控方法，发现卤化银晶体的结构特征具有重要影响，多层结构乳剂显示出最佳的感光特性。灰化过程的控制影响到灰雾中心的形态和分布，灰化方式的变化能有效地调控影像最大密度和感光敏度。有机减感染料在直接正性照相乳剂中的应用大大改善了其反转速度。碘在卤化银颗粒表面的存在便直接正性照相乳剂的感光敏度有明显的增加。Some factors and methods that can improve the photographic properties of the direct positive photographic emulsion were studied.It was found that the structure characteristicsof the silver halide crystal has significant effect on the properties and the emulsion with multi-lay-er crystals may be the best one for direct positive imaging.The prefoging process is important,because it can influence the form and the distribution of the fog center.Changing the way andmeans of prefogging may effectively control the maximum density and the sensitivity. The rever-sal speed increases greatly when an organic desensitizing dye is used.The effect of iedide distribution in the silver halide crystal is notable. When iodide is located at the grain surface,the sen-sitivity of the direct positive emulsion increases obviously.

关 键 词：直接正性乳剂 减感剂 灰化控制 成像体系 卤化银 

分 类 号：TQ571.6[化学工程—精细化工]