公开(公告)号：US5503970A

公开(公告)日：1996-04-02

申请号：US296562

申请日：1994-08-26

申请人： Myra T. Olm ,  Xin Wen ,  Richard L. Daubendiek ,  Donald L. Black ,  Joseph C. Deaton ,  Timothy R. Gersey ,  Joseph G. Lighthouse ,  Robert D. Wilson

发明人： Myra T. Olm ,  Xin Wen ,  Richard L. Daubendiek ,  Donald L. Black ,  Joseph C. Deaton ,  Timothy R. Gersey ,  Joseph G. Lighthouse ,  Robert D. Wilson

IPC分类号： G03C1/005 ,  G03C1/08 ,  G03C1/46 ,  G03C1/035 ,  G03C1/09

CPC分类号： G03C1/08 ,  G03C1/0051 ,  G03C1/46

摘要： A chemically and spectrally sensitized ultrathin tabular grain emulsion is disclosed including tabular grains (a) having {111} major faces, (b) containing greater than 70 mole percent bromide, based on silver, (c) accounting for greater than 90 percent of total grain projected area, (d) exhibiting an average equivalent circular diameter of at least 0.7 .mu.m, and (e) exhibiting an average thickness of less than 0.07 .mu.m.It has been observed that increased speed and contrast as well as improvements in speed-granularity relationships can be realized when the surface chemical sensitization sites include epitaxially deposited silver halide protrusions forming epitaxial junctions with the tabular grains, the protrusions (a) being located on up to 50 percent of the surface area of the tabular grains, (b) having a higher overall solubility than at least that portion of the tabular grains forming epitaxial junctions with the protrusions, and (c) forming a face centered cubic crystal lattice.In further improving photographic performance by incorporating a photographically useful dopant, it has been observed that thinner tabular grains can be realized by locating the dopant in the protrusions. Still further improvements in photographic sensitivity can be realized by selecting the dopant to act as a shallow trap for photoelectrons.

摘要翻译： 公开了化学和光谱增感的超薄片状颗粒乳剂，其包括具有{111}主面的片状颗粒（a），（b）基于银含有大于70摩尔％的溴化物，（c）占总量的90％以上 （d）平均当量圆直径至少为0.7μm，（e）平均厚度小于0.07μm。 已经观察到，当表面化学增感部位包括形成与片状颗粒的外延结的外延淀积的卤化银突起时，可以实现速度和对比度的提高以及速度 - 粒度关系的改善，突起（a）位于上面 至（b）具有比至少部分片状颗粒形成与突起外延结合的整体溶解度更好的表面积，（c）形成面心立方晶格。 通过掺入摄影有用的掺杂剂进一步提高照相性能，已经观察到可以通过将掺杂剂定位在突起中来实现更薄的片状颗粒。 可以通过选择掺杂剂作为光电子的浅陷阱来实现照相感光度的进一步提高。

公开(公告)号：US5582965A

公开(公告)日：1996-12-10

申请号：US451881

申请日：1995-05-26

申请人： Joseph C. Deaton ,  Richard L. Daubendiek ,  Donald L. Black ,  Timothy R. Gersey ,  Joseph G. Lighthouse ,  Myra T. Olm ,  Xin Wen ,  Robert D. Wilson

发明人： Joseph C. Deaton ,  Richard L. Daubendiek ,  Donald L. Black ,  Timothy R. Gersey ,  Joseph G. Lighthouse ,  Myra T. Olm ,  Xin Wen ,  Robert D. Wilson

IPC分类号： G03C1/005 ,  G03C1/08 ,  G03C1/46 ,  G03C1/035

CPC分类号： G03C1/0051 ,  G03C1/08 ,  G03C1/46

摘要： A chemically and spectrally sensitized ultrathin tabular grain emulsion is disclosed including tabular grains (a) having {111} major faces, (b) containing greater than 70 mole percent bromide and at least 0.25 mole percent iodide, based on silver, (c) accounting for greater than 90 percent of total grain projected area, (d) exhibiting an average equivalent circular diameter of at least 0.7 .mu.m, and (e) exhibiting an average thickness of less than 0.07 .mu.m.It has been observed that faster rates of development, relatively thinner tabular grains under comparable conditions of preparation, increased contrast and improvements in speed-granularity relationships can be realized when (1) the tabular grains contain less than 10 mole percent iodide and (2) the surface chemical sensitization sites include epitaxially deposited silver halide protrusions of a face centered cubic crystal lattice structure of the rock salt type forming epitaxial junctions with the tabular grains, the protrusions (a) being restricted to those portions of the tabular grains located nearest peripheral edges of and accounting for less than 50 percent of the {111} major faces of the tabular grains, (b) containing a silver chloride concentration at least 10 mole percent higher than that of the tabular grains, and (c) including a higher iodide concentration than those portions of the tabular grains extending between the {111} major faces and forming epitaxial junctions with the protrusions.A photographic element is disclosed in which an ultrathin tabular grain emulsion as described above is coated over an emulsion layer intended to record visible light.

摘要翻译： 公开了一种化学和光谱增感的超薄片状颗粒乳液，其包括具有{111}主面的片状颗粒（a），（b）含有大于70摩尔百分比的溴和至少0.25摩尔百分数的碘，基于银，（c） 占总颗粒投影面积的90％以上，（d）平均当量圆直径至少为0.7μm，（e）平均厚度小于0.07μm。 已经观察到，当（1）片状颗粒含有小于10摩尔％的碘化物时，可以实现更快的发展速度，相当的制备条件下相对较薄的片状颗粒增加对比度和速度 - 粒度关系的改善，（2） 表面化学增感部位包括与片状晶粒形成外延结的岩盐型的面心立方晶格结构的外延沉积的卤化银突起，突起（a）限于位于最近周边边缘的片状颗粒的那些部分 占片状颗粒{111}主面的不到50％，（b）含有比片状颗粒高至少10摩尔％的氯化银浓度，（c）包含较高的碘化物浓度 比在{111}主面之间延伸并形成外延结的片状颗粒的那些部分 突起。 公开了一种照相材料，其中将如上所述的超薄片状颗粒乳剂涂覆在旨在记录可见光的乳剂层上。

公开(公告)号：US5629144A

公开(公告)日：1997-05-13

申请号：US363480

申请日：1994-12-23

申请人： Richard L. Daubendiek ,  Donald L. Black ,  Joseph C. Deaton ,  Timothy R. Gersey ,  Joseph G. Lighthouse ,  Myra T. Olm ,  Xin Wen ,  Robert D. Wilson

发明人： Richard L. Daubendiek ,  Donald L. Black ,  Joseph C. Deaton ,  Timothy R. Gersey ,  Joseph G. Lighthouse ,  Myra T. Olm ,  Xin Wen ,  Robert D. Wilson

IPC分类号： G03C1/005 ,  G03C1/18 ,  G03C1/34 ,  G03C1/035

CPC分类号： G03C1/0051 ,  G03C1/346 ,  G03C1/18

摘要： The invention provides a radiation-sensitive silver halide emulsion comprisingsilver halide grains including tabular grains(a) having {111} major faces(b) containing greater than 70 mole percent bromide, based on silver,(c) accounting for greater than 90 percent of total grain projected area,(d) exhibiting an average equivalent circular diameter of at least 0.7 .mu.m,(e) exhibiting an average thickness of less than 0.07 .mu.m, and(f) having latent image forming chemical sensitization sites on the surfaces of the tabular rains, anda spectral sensitizing dye adsorbed to the surfaces of the tabular grains,wherein the surface chemical sensitization sites include at least one silver salt epitaxially located on said tabular rains and wherein said grains further comprise a mercapto compound represented by Formula III ##STR1## where R.sup.1 is an aliphatic or aromatic radical containing up to 20 carbon atoms.

摘要翻译： 本发明提供了一种辐射敏感的卤化银乳剂，其包含卤化银颗粒，其包括片状颗粒（a），其具有{111}主面（b），其含有基于银的大于70摩尔％的溴化物，（c）占90％ （d）平均当量圆直径至少为0.7μm，（e）平均厚度小于0.07μm，（f）在表面上具有潜像形成化学增感点 的平板状降雨，以及吸附在片状颗粒表面的光谱增感染料，其中表面化学增感位点包括至少一个外延位于所述片状雨水上的银盐，并且其中所述颗粒还包含由式III表示的巯基化合物 其中R 1是含有至多20个碳原子的脂族或芳族基团。

公开(公告)号：US5503971A

公开(公告)日：1996-04-02

申请号：US297430

申请日：1994-08-26

申请人： Richard L. Daubendiek ,  Donald L. Black ,  Joseph C. Deaton ,  Timothy R. Gersey ,  Joseph G. Lighthouse ,  Myra T. Olm ,  Xin Wen ,  Robert D. Wilson

发明人： Richard L. Daubendiek ,  Donald L. Black ,  Joseph C. Deaton ,  Timothy R. Gersey ,  Joseph G. Lighthouse ,  Myra T. Olm ,  Xin Wen ,  Robert D. Wilson

IPC分类号： G03C1/005 ,  G03C1/08 ,  G03C1/46 ,  G03C1/035 ,  G03C1/09

CPC分类号： G03C1/08 ,  G03C1/0051 ,  G03C1/46

摘要： An improved spectrally sensitized ultrathin tabular grain emulsion is disclosed in which tabular grains (a) having {111} major faces, (b) containing greater than 70 mole percent bromide and at least 0.25 mole percent iodide, based on silver, (c) accounting for greater than 90 percent of total grain projected area, (d) exhibiting an average equivalent circular diameter of at least 0.7 .mu.m, (e) exhibiting an average thickness of less than 0.07 .mu.m, and (f) having latent image forming chemical sensitization sites on the surfaces of the tabular grains, are spectrally sensitized. The speed-granularity relationship of the emulsion is improved by employing in forming the surface chemical sensitization sites at least one silver salt epitaxially located on tabular grain surface sites that contain increased iodide concentrations.A photographic element is disclosed comprised of a support, a first silver halide emulsion layer coated on the support and sensitized to produce a photographic record when exposed to specular light within the minus blue visible wavelength region of from 500 to 700 nm, a second silver halide emulsion layer capable of producing a second photographic record coated over the first silver halide emulsion layer to receive specular minus blue light intended for the exposure of the first silver halide emulsion layer, the second silver halide emulsion layer being capable of acting as a transmission medium for the delivery of at least a portion of the minus blue light intended for the exposure of the first silver halide emulsion layer in the form of specular light, wherein the second silver halide emulsion layer is comprised of the improved spectrally sensitized ultrathin tabular grain emulsion of the invention.The ultrathin tabular grain emulsions with silver salt epitaxy chemical sensitization have been observed to produce larger than expected speed increases, to produce higher than expected contrasts, to be unexpectedly specularly transmissive and therefore compatible with forming sharp photographic images in underlying emulsion layers, to exhibit a higher percentage of total light absorption in the wavelength region of maximum absorption by the spectral sensitizing dye or dyes employed, and to exhibit a surprising tolerance of inadvertent manufacturing variances.

公开(公告)号：US5576171A

公开(公告)日：1996-11-19

申请号：US442228

申请日：1995-05-15

申请人： Myra T. Olm ,  Richard L. Daubendiek ,  Joseph C. Deaton ,  Donald L. Black ,  Timothy R. Gersey ,  Joseph G. Lighthouse ,  Xin Wen ,  Robert D. Wilson

发明人： Myra T. Olm ,  Richard L. Daubendiek ,  Joseph C. Deaton ,  Donald L. Black ,  Timothy R. Gersey ,  Joseph G. Lighthouse ,  Xin Wen ,  Robert D. Wilson

IPC分类号： G03C1/005 ,  G03C1/08 ,  G03C1/035 ,  G03C1/09

CPC分类号： G03C1/0051 ,  G03C1/08

摘要： A chemically and spectrally sensitized tabular grain emulsion is disclosed including tabular grains (a) having {111} major faces, (b) containing greater than 70 mole percent bromide and at least 0.25 mole percent iodide, based on silver, (c) accounting for greater than 90 percent of total grain projected area, (d) exhibiting an average equivalent circular diameter of at least 0.7 .mu.m, and (f) exhibiting an average thickness in the range of from less than 0.3 .mu.m to at least 0.07 .mu.m.It has been observed that photographic performance is enhanced when surface chemical sensitization sites include epitaxially deposited silver halide protrusions forming epitaxial junctions with the tabular grains, the protrusions (a) being located on up to 50 percent of the surface area of the tabular grains, (b) having a higher overall solubility than at least that portion of the tabular grains forming epitaxial junction with the protrusions, (c) forming a face centered cubic crystal lattice, and (d) containing a speed enhancing dopant selected to provide shallow electron trapping sites.

摘要翻译： 公开了化学和光谱增感的片状颗粒乳剂，其包括具有{111}主面的片状颗粒（a），（b）含有大于70摩尔百分比的溴和基于银的至少0.25摩尔％的碘化物，（c）占 占总颗粒投影面积的90％以上，（d）平均当量圆直径至少为0.7μm，（f）平均厚度在小于0.3μm至至少0.07μm的范围内 。 已经观察到，当表面化学增感位点包括形成与片状颗粒的外延结的外延沉积的卤化银突起时，照相性能得到增强，突起（a）位于片状颗粒的表面积的50％以上 b）具有比至少部分片状颗粒形成与突起外延结合的总溶解度更高的总溶解度，（c）形成面心立方晶格，（d）含有选择提供浅电子捕获位点的速度增强掺杂物 。

公开(公告)号：US5576168A

公开(公告)日：1996-11-19

申请号：US297195

申请日：1994-08-26

申请人： Richard L. Daubendiek ,  Donald L. Black ,  Joseph C. Deaton ,  Timothy R. Gersey ,  Joseph G. Lighthouse ,  Myra T. Olm ,  Xin Wen ,  Robert D. Wilson

发明人： Richard L. Daubendiek ,  Donald L. Black ,  Joseph C. Deaton ,  Timothy R. Gersey ,  Joseph G. Lighthouse ,  Myra T. Olm ,  Xin Wen ,  Robert D. Wilson

IPC分类号： G03C1/005 ,  G03C1/08 ,  G03C1/46 ,  G03C1/035 ,  G03C1/015

CPC分类号： G03C1/08 ,  G03C1/0051 ,  G03C1/46

摘要： A chemically and spectrally sensitized ultrathin tabular grain emulsion is disclosed including tabular grains (a) having {111} major faces, (b) containing greater than 70 mole percent bromide and at least 0.25 mole percent iodide, based on silver, (c) accounting for greater than 90 percent of total grain projected area, (d) exhibiting an average equivalent circular diameter of at least 0.7 .mu.m, and (e) exhibiting an average thickness of less than 0.07 .mu.m.It has been observed that increased speed and contrast as well as improvements in speed-granularity relationships can be realized when during the chemical sensitization silver and halide ions including iodide and chloride ions are added to the ultrathin tabular grain host emulsion to deposit epitaxially on up to 50 percent of the surface area of the tabular grains silver halide protrusions (a) having an isomorphic face centered cubic crystal lattice structure, (b) containing at least a 10 mole percent higher chloride ion concentration than the tabular grains, and (c) containing an iodide concentration that is increased by the iodide ion addition.

摘要翻译： 公开了一种化学和光谱增感的超薄片状颗粒乳液，其包括具有{111}主面的片状颗粒（a），（b）含有大于70摩尔百分比的溴和至少0.25摩尔百分数的碘，基于银，（c） 占总颗粒投影面积的90％以上，（d）平均当量圆直径至少为0.7μm，（e）平均厚度小于0.07μm。 已经观察到，当在化学增感期间，可以实现增加的速度和对比度以及速度 - 粒度关系的改善，其中包括碘化物和氯离子的银和卤离子被添加到超薄片状颗粒主体乳液中以外延地沉积到 具有同构面心立方晶格结构的片状粒状卤化银突片（a）的表面积的50％，（b）含有比片状颗粒高至少10摩尔％的氯离子浓度，和（c）含有 通过碘离子添加而增加的碘化物浓度。

公开(公告)号：US5573902A

公开(公告)日：1996-11-12

申请号：US441491

申请日：1995-05-15

申请人： Richard L. Daubendiek ,  Joseph C. Deaton ,  Donald L. Black ,  Timothy R. Gersey ,  Joseph G. Lighthouse ,  Myra T. Olm ,  Xin Wen ,  Robert D. Wilson

发明人： Richard L. Daubendiek ,  Joseph C. Deaton ,  Donald L. Black ,  Timothy R. Gersey ,  Joseph G. Lighthouse ,  Myra T. Olm ,  Xin Wen ,  Robert D. Wilson

IPC分类号： G03C1/005 ,  G03C1/035

CPC分类号： G03C1/0051

摘要： A chemically and spectrally sensitized tabular grain emulsion is disclosed including tabular grains (a) having major faces, (b) containing greater than 70 mole percent bromide and at least 0.25 mole percent iodide, based on silver, (c) accounting for greater than 90 percent of total grain projected area, (d) exhibiting an average equivalent circular diameter of at least 0.7 .mu.m, and (f) exhibiting an average thickness in the range of from less than 0.3 .mu.m to at least 0.07 .mu.m.It has been observed that increased speed, lower granularity, increased contrast and faster rates of development can be realized when (1) the tabular grains contain less than 10 mole percent iodide and (2) the surface chemical sensitization sites include epitaxially deposited silver halide protrusions of a face centered cubic crystal lattice structure of the rock salt type forming epitaxial junctions with the tabular grains, the protrusions (a) being restricted to those portions of the tabular grains located nearest peripheral edges of and accounting for less than 50 percent of the major faces of the tabular grains, (b) containing a silver chloride concentration at least 10 mole percent higher than that of the tabular grains, and (c) including at least 1 mole percent iodide.

摘要翻译： 公开了化学和光谱增感的片状颗粒乳剂，其包括具有主面的片状颗粒（a），（b）含有大于70摩尔％溴和至少0.25摩尔％碘的碘，基于银，（c）占大于90 占总颗粒投影面积的百分比，（d）平均当量圆直径至少为0.7μm，和（f）平均厚度在小于0.3μm至至少0.07μm的范围内。 已经观察到，当（1）片状颗粒含有少于10摩尔％的碘化物时，可以实现增加的速度，较低的颗粒度，增加的对比度和较快的显影速率，和（2）表面化学增感位点包括外延沉积的卤化银突起 形成与片状晶粒形成外延结的岩盐型的面心立方晶格结构，突起（a）限于位于最近周边边缘的片状颗粒的那些部分，占主要部分的50％以下 （b）含有比片状颗粒高至少10摩尔％的氯化银浓度，（c）包含至少1摩尔％的碘化物。

公开(公告)号：US5614358A

公开(公告)日：1997-03-25

申请号：US441489

申请日：1995-05-15

申请人： Robert D. Wilson ,  Myra T. Olm ,  Richard L. Daubendiek ,  Donald L. Black ,  Joseph C. Deaton ,  Timothy R. Gersey ,  Joseph G. Lighthouse ,  Xin Wen

发明人： Robert D. Wilson ,  Myra T. Olm ,  Richard L. Daubendiek ,  Donald L. Black ,  Joseph C. Deaton ,  Timothy R. Gersey ,  Joseph G. Lighthouse ,  Xin Wen

IPC分类号： G03C1/005 ,  G03C1/08 ,  G03C1/46 ,  G03C1/09 ,  G03C1/035

CPC分类号： G03C1/08 ,  G03C1/0051 ,  G03C1/46

摘要： A chemically and spectrally sensitized ultrathin tabular grain emulsion is disclosed including tabular grains (a) having {111} major faces, (b) containing greater than 70 mole percent bromide, based on silver, (c) accounting for greater than 90 percent of total grain projected area, (d) exhibiting an average equivalent circular diameter of at least 0.7 .mu.m, and (e) exhibiting an average thickness of less than 0.07 .mu.m.It has been observed that increased speed and contrast as well as improvements in speed-granularity relationships can be realized when the surface chemical sensitization sites include epitaxially deposited silver halide protrusions forming epitaxial junctions with the tabular grains, the protrusions (a) being located on up to 50 percent of the surface area of the tabular grains, (b) having a higher overall solubility than at least that portion of the tabular grains forming epitaxial junctions with the protrusions, and (c) forming a face centered cubic crystal lattice.In further improving photographic performance by incorporating a photographically useful dopants, it has been observed that iridium placed in the ultrathin tabular grains and a shallow electron trapping site providing dopant placed in the silver halide protrusions can together increase photographic speed and reduce high intensity reciprocity failure.

摘要翻译： 公开了化学和光谱增感的超薄片状颗粒乳剂，其包括具有{111}主面的片状颗粒（a），（b）基于银含有大于70摩尔％的溴化物，（c）占总量的90％以上 （d）平均当量圆直径至少为0.7μm，（e）平均厚度小于0.07μm。 已经观察到，当表面化学增感部位包括形成与片状颗粒的外延结的外延淀积的卤化银突起时，可以实现速度和对比度的提高以及速度 - 粒度关系的改善，突起（a）位于上面 至（b）具有比至少部分片状颗粒形成与突起外延结合的整体溶解度更好的表面积，（c）形成面心立方晶格。 通过掺入摄影有用的掺杂剂来进一步提高照相性能，已经观察到放置在超薄片状晶粒中的铱和提供放置在卤化银突起中的掺杂物的浅电子俘获位置可以一起增加照相速度并降低高强度互易失效。

公开(公告)号：US5536632A

公开(公告)日：1996-07-16

申请号：US441132

申请日：1995-05-15

申请人： Xin Wen ,  Richard L. Daubendiek ,  Donald L. Black ,  Joseph C. Deaton ,  Timothy R. Gersey ,  Joseph G. Lighthouse ,  Myra T. Olm ,  Robert D. Wilson

发明人： Xin Wen ,  Richard L. Daubendiek ,  Donald L. Black ,  Joseph C. Deaton ,  Timothy R. Gersey ,  Joseph G. Lighthouse ,  Myra T. Olm ,  Robert D. Wilson

IPC分类号： G03C1/005 ,  G03C1/08 ,  G03C1/46 ,  G03C1/035 ,  G03C1/09

CPC分类号： G03C1/0051 ,  G03C1/08 ,  G03C1/46

摘要： A chemically and spectrally sensitized ultrathin tabular grain emulsion is disclosed including tabular grains (a) having {111} major faces, (b) containing greater than 70 mole percent bromide, based on silver, (c) accounting for greater than 90 percent of total grain projected area, (d) exhibiting an average equivalent circular diameter of at least 0.7 .mu.m, and (e) exhibiting an average thickness of less than 0.07 .mu.m.Improved sensitivity is observed when the surface chemical sensitization sites include silver halide protrusions of a face centered cubic crystal lattice structure forming epitaxial junctions with the tabular grains and having a higher overall solubility than at least that portion of the tabular grains forming epitaxial junctions with the protrusions and a sensitivity enhancing combination of dopants are contained in the silver halide grains including a first sensitivity enhancing dopant capable of providing shallow electron trapping sites and a second sensitivity enhancing selenium dopant. To further enhance sensitivity, one of the sensitivity enhancing dopants is restricted to the tabular grains while the other is restricted to the silver halide epitaxy.

摘要翻译： 公开了化学和光谱增感的超薄片状颗粒乳剂，其包括具有{111}主面的片状颗粒（a），（b）基于银含有大于70摩尔％的溴化物，（c）占总量的90％以上 （d）平均当量圆直径至少为0.7μm，（e）平均厚度小于0.07μm。 当表面化学增感部位包括面心立方晶格结构的卤化银突起形成与片状颗粒形成外延结和具有比至少部分形成与凸起的外延结的片状颗粒更高的总体溶解度时，观察到灵敏度提高 并且包含掺杂剂的敏感度增强组合包含在包含能够提供浅电子捕获位点的第一灵敏度增强掺杂剂和第二灵敏度增强硒掺杂剂的卤化银颗粒中。 为了进一步提高灵敏度，灵敏度增强掺杂剂之一限于片状晶粒，而另一种限于卤化银外延。

公开(公告)号：US5494789A

公开(公告)日：1996-02-27

申请号：US359251

申请日：1994-12-19

申请人： Richard L. Daubendiek ,  Donald L. Black ,  Joseph C. Deaton ,  Timothy R. Gersey ,  Joseph G. Lighthouse ,  Myra T. Olm ,  Xin Wen ,  Robert D. Wilson

发明人： Richard L. Daubendiek ,  Donald L. Black ,  Joseph C. Deaton ,  Timothy R. Gersey ,  Joseph G. Lighthouse ,  Myra T. Olm ,  Xin Wen ,  Robert D. Wilson

IPC分类号： G03C1/00 ,  G03C1/005 ,  G03C1/015 ,  G03C1/035 ,  G03C1/07 ,  G03C1/08 ,  G03C1/09 ,  G03C1/10 ,  G03C1/46 ,  G03C7/00

CPC分类号： G03C1/08 ,  G03C1/0051 ,  G03C1/46

摘要： An improved spectrally sensitized ultrathin tabular grain emulsion is disclosed in which tabular grains (a) having {111} major faces, (b) containing greater than 70 mole percent bromide, based on silver, (c) accounting for greater than 90 percent of total grain projected area, (d) exhibiting an average equivalent circular diameter of at least 0.7 .mu.m, (e) exhibiting an average thickness of less than 0.07 .mu.m, and (f) having latent image forming chemical sensitization sites on the surfaces of the tabular grains, are spectrally sensitized and improved by employing in forming the surface chemical sensitization sites at least one silver salt epitaxially located on the tabular grains. A photographic element is disclosed comprised of a support, a first silver halide emulsion layer coated on the support and sensitized to produce a photographic record when exposed to specular light within the minus blue visible wavelength region of from 500 to 700 nm, a second silver halide emulsion layer capable of producing a second photographic record coated over the first silver halide emulsion layer to receive specular minus blue light intended for the exposure of the first silver halide emulsion layer, the second silver halide emulsion layer being capable of acting as a transmission medium for the delivery of at least a portion of the minus blue light intended for the exposure of the first silver halide emulsion layer in the form of specular light, wherein the second silver halide emulsion layer is comprised of the improved spectrally sensitized ultrathin tabular grain emulsion of the invention.

摘要翻译： 公开了一种改进的光谱增感超薄片状颗粒乳剂，其中具有{111}主面的片状颗粒（a）（b）含有大于70摩尔百分比的溴化银，基于银，（c）占总量的90％以上 颗粒投影面积，（d）平均当量圆直径至少为0.7μm，（e）平均厚度小于0.07μm，（f）在该表面上具有潜像形成化学增感点 片状颗粒通过在表面化学增感位点上形成至少一个外延位于片状颗粒上的银盐而被光谱增感和改进。 公开了一种照相元件，其包括支撑体，涂覆在载体上的第一卤化银乳剂层，并且当暴露于500-700nm的负蓝色可见光波长区域内的镜面光时被致敏以产生照相记录，第二卤化银 乳剂层，其能够产生涂覆在第一卤化银乳剂层上的第二照相记录，以接收用于暴露第一卤化银乳剂层的镜面负蓝光，第二卤化银乳剂层能够用作传播介质 输送用于以镜面光的形式暴露第一卤化银乳剂层的至少一部分负蓝光，其中第二卤化银乳剂层由改进的光谱增感的超薄片状颗粒乳剂组成， 发明。