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1. 发明授权

US5358840A Tabular grain silver iodobromide emulsion of improved sensitivity and process for its preparation 失效
标题翻译：片状银碘化银乳剂的改进灵敏度及其制备方法
公开(公告)号：US5358840A
公开(公告)日：1994-10-25
申请号：US96104
申请日：1993-07-22
申请人： Eleanor Chaffee , Mamie Kam-Ng , Allen K. Tsaur , David E. Fenton , Donald L. Black
发明人： Eleanor Chaffee , Mamie Kam-Ng , Allen K. Tsaur , David E. Fenton , Donald L. Black
IPC分类号： G03C1/015 , G03C1/005 , G03C1/035 , G03C1/06 , G03C1/07
CPC分类号： G03C1/0051
摘要： Silver iodobromide tabular grain emulsions of enhanced photographic sensitivity are disclosed. The silver iodobromide grains contain from 2 to less than 10 mole percent iodide, exhibit a coefficient of variation of less than 20 percent, and consisting essentially of tabular grains having opposed parallel major faces. Each of the tabular silver bromoiodide grains exhibit an iodide concentration in excess of 6 mole percent within a surface region extending to a depth of less than 0.02 .mu.m and exhibit a central iodide concentration of less than 2 mole percent.The tabular grain emulsion is prepared by providing within a reaction vessel a population of silver bromide or iodobromide host grains exhibiting a coefficient of variation of less than 20 percent and containing less than 2 mole percent iodide consisting essentially of tabular grains and introducing silver, bromide and iodide ions into the reaction vessel for deposition onto the major faces on the host tabular grains, with iodide ions accounting for at least 25 mole percent of total halide ions introduced.
摘要翻译：公开了具有增强的照相感光度的碘溴化银片状颗粒乳剂。碘溴化银颗粒含有2至小于10摩尔％的碘化物，显示出小于20％的变异系数，并且基本上由具有相对的平行主面的片状颗粒组成。每个片状溴碘化银颗粒在延伸到小于0.02μm深度的表面区域内显示出超过6mol％的碘化物浓度，并显示小于2mol％的中心碘化物浓度。片状颗粒乳剂通过在反应容器内提供一组溴化银或碘溴化物主体颗粒，其显示出小于20％的变异系数并且含有小于2摩尔％的碘化物，其基本上由片状颗粒组成，并引入银，溴和碘离子进入反应容器，沉积在主体片状颗粒的主面上，碘离子占引入总卤化物离子的至少25摩尔％。

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