公开(公告)号：US4945037A

公开(公告)日：1990-07-31

申请号：US336406

申请日：1989-04-11

申请人： Mitsuo Saitou

发明人： Mitsuo Saitou

IPC分类号： G03C1/005 ,  G03C1/015 ,  G03C1/035

CPC分类号： G03C1/0051 ,  G03C1/035 ,  G03C2001/0055 ,  G03C2001/0058 ,  G03C2001/0156 ,  G03C2001/03511 ,  G03C2001/03535 ,  G03C2001/03558 ,  G03C2200/43

摘要： A silver halide photographic emulsion comprising silver halide grains is disclosed, wherein at least 60% of the total projected area of the silver halide grains is comprised of tabular silver halide grains having a central portion and an outer portion, of which the iodide content of the central portion is from 7 mol % to the solid solution limit, and which have two parallel twinned crystal planes.A method for the manufacture of the silver halide emulsion is also disclosed, which comprises the steps of nucleating the silver halide grains under conditions where the gelatin concentration in the reaction solution is set at from 0.1 to 20 wt %, the addition rates of the silver salt and the halide are set at from 6.times.10.sup.-4 to 2.9.times.10.sup.-1 mol/minute per liter of reaction solution, and the pBr value in the reaction solution is set at from 1.0 to 2.5, Ostwald ripening the nucleated grains, and then growing the thus ripened grains.

摘要翻译： 公开了包含卤化银颗粒的卤化银照相乳剂，其中卤化银颗粒的总投影面积的至少60％由具有中心部分和外部部分的片状卤化银颗粒组成，其中碘化物含量 中心部分为7mol％至固溶极限，并且具有两个平行的双晶晶面。 还公开了制备卤化银乳剂的方法，其包括在反应溶液中的明胶浓度为0.1至20重量％的条件下将卤化银颗粒成核的步骤，银的添加速率 盐和卤化物的浓度为每升反应溶液为6×10 -4〜2.9×10 -1 mol /分钟，反应溶液中的pBr值为1.0〜2.5，Ostwald熟化有核晶粒，然后生长 这样成熟的谷物。