公开(公告)号：US4433049A

公开(公告)日：1984-02-21

申请号：US347647

申请日：1982-02-10

申请人： Noboru Itoh ,  Toshiaki Takahashi ,  Keiji Ogi ,  Atsushi Kamitakahara

发明人： Noboru Itoh ,  Toshiaki Takahashi ,  Keiji Ogi ,  Atsushi Kamitakahara

IPC分类号： C01G3/04 ,  G03C1/725 ,  G03C1/72

CPC分类号： G03C1/725

摘要： Disclosed is a method for preparing a light-sensitive cuprous halide emulsion which comprises reducing cupric ions by an ascorbic acid derivative represented by the general formula: ##STR1## wherein R is a hydrogen atom or a hydroxyl group, and n is an integer of 1 to 4, provided that R is a hydroxyl group when n is 1, or its alkali metal salt, in the presence of halogen ions.

摘要翻译： 公开了一种制备感光卤化铜乳剂的方法，其包括通过以下通式表示的抗坏血酸衍生物还原铜离子：其中R是氢原子或羟基，n是整数1 至4，条件是当n为1时R为羟基或其碱金属盐，在卤素离子存在下。

公开(公告)号：US4868102A

公开(公告)日：1989-09-19

申请号：US151695

申请日：1988-02-02

申请人： Keiji Ogi ,  Atsushi Kamitakahara ,  Eiichi Sakamoto ,  Nariko Isozaki

发明人： Keiji Ogi ,  Atsushi Kamitakahara ,  Eiichi Sakamoto ,  Nariko Isozaki

IPC分类号： G03C1/015 ,  G03C1/035 ,  G03C1/485

CPC分类号： G03C1/48576 ,  Y10S430/141

摘要： A light-sensitive silver halide direct-positive photographic material which comprises a support and, provided thereon a light-sensitive direct-positive silver halide emulsion layer containing silver halide grains having an internal latent image and a core-shell structure comprising a core and at least one shell stratum either partly or entirely covering said core, the outermost stratum of said shell having been formed in the presence of a nitrogen-containing heterocyclic compound having a mercapto group therein.

公开(公告)号：US4749644A

公开(公告)日：1988-06-07

申请号：US875611

申请日：1986-06-18

申请人： Yasuo Tosaka ,  Keiji Ogi ,  Atsushi Kamitakahara

发明人： Yasuo Tosaka ,  Keiji Ogi ,  Atsushi Kamitakahara

IPC分类号： G03C7/00 ,  G03C1/485 ,  G03C7/30 ,  G03C7/32 ,  G03C1/02 ,  G03C1/08 ,  G03C7/26

CPC分类号： G03C7/3003 ,  G03C7/3022 ,  Y10S430/141 ,  Y10S430/158

摘要： In a light-sensitive direct posi silver halide color photographic material having photographic constituent layers comprising at least one silver halide emulsion layer containing latent image type silver halide grains not previously fogged, which is capable of giving a direct posi image by subjecting the whole surface to exposure or effecting surface development in the presence of a fogging agent, after image exposure, the improvement wherein said internal latent image type silver halide grains are composed of at least two groups of internal latent image type silver halide grains having average grain sizes different from each other, and at least one compound capable of releasing a development inhibiting substance or its precursor through the reaction with the oxidized product of a color developing agent is contained in at least one layer of said photographic constituent layers.According to the present invention, there can be obtained a direct posi color photographic material improved in processing stability, having smooth gradation and excellent image quality, in which the respective photographic performances of at least two groups of internal latent type silver halide grains having grains sizes different from each other are fully utilized.

摘要翻译： 在具有摄影构成层的光敏直接卤化银彩色照相材料中，该照相构成层包含至少一个含有未被雾化的潜像型卤化银颗粒的卤化银乳剂层，其能够通过使整个表面经受 在雾化剂存在下曝光或进行表面显影，图像曝光后，其中所述内部潜像型卤化银颗粒由平均粒度不同于每个的至少两组内部潜像型卤化银颗粒组成的改进 并且至少一种能够通过与彩色显影剂的氧化产物反应释放显影抑制物质或其前体的化合物被包含在至少一层所述照相构成层中。 根据本发明，可以获得提高处理稳定性的直接posi彩色照相材料，具有平滑的等级和优异的图像质量，其中至少两组具有粒径的内部潜在型卤化银颗粒的照相性能 彼此不同，被充分利用。