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US 5,478,717 AGranted
Silver halide emulsion and photographic light-sensitive material using the same
AssigneeFuji Photo Film Co., Ltd.
InventorsHideo Ikeda, Takefumi Hara
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AssigneeFuji Photo Film Co., Ltd.
InventorsHideo Ikeda, Takefumi Hara
Estimating the term…
An emulsion contains tabular silver halide having a thickness of less than 0.5 .mu.m, a diameter of 0.3 .mu.m or more, and a grain diameter/thickness ratio of 2 or more. The tabular silver halide grains account for at least 50% of a total projected area of all silver halide grains. 50% (number) or more of the tabular silver halide grains include 10 or more dislocations per grain. A relative standard elevation of silver iodide content of individual tabular silver halide 30% or less. This light-sensitive silver halide emulsion has a high sensitivity and a high gamma improved in photographic properties and in rate of development. Each tabular silver halide grain may internally have a portion where a silver iodide content is higher than that of the surface of the grain. When the light-sensitive silver halide emulsion is added to a silver halide emulsion layer, a photographic light-sensitive material having a high sensitivity and a high gamma and improved in photographic properties and in rate of development can be obtained.
A light-sensitive silver halide emulsion comprising tabular silver halide grains having a thickness of less than 0.5 .mu.m, a diameter of not less than 0.3 .mu.m, and a grain diameter/grain thickness ratio of not less than 2, wherein said tabular silver halide grains account for at least 50% of a total projected area of all silver halide grains, not less than 50% (number) of said tabular silver halide grains include not less than dislocations per grain, a relative standard deviation of silver iodide content of individual tabular silver halide grains is not more than 30%, and said tabular grains contain 1-5 mol percent of silver iodide.
A photographic light-sensitive material having at least one silver halide emulsion layer on a support, wherein said silver halide emulsion layer contains a light-sensitive silver halide emulsion comprising tabular silver halide grains having a thickness of less than 0.5 .mu.m, a diameter of not less than 0.3 .mu.m, and a grain diameter/grain thickness ratio of not less than 2, in which said tabular silver halide grains account for at least 50% of a total projected area of all silver halide grains, not less than 50% (number) of said tabular silver halide grains include not less than 10 dislocations per grain, and a relative standard deviation of silver iodide content of individual tabular silver halide grains is not more than 30%, and said tabular grains contain 1-5 mol percent of silver iodide.
A light-sensitive silver halide emulsion comprising tabular silver halide grains having a thickness of less than 0.5 .mu.m, a diameter of not less than 0.3 .mu.m, and a grain diameter/grain thickness ratio of not less than 2, wherein said tabular silver halide grains account for at least 50% of a total projected area of all silver halide grains, not less than 50% (number) of said tabular silver halide grains include not less than 10 dislocations per grain, a relative standard deviation of silver iodide content of individual tabular silver halide grains is not more than 20%, and said tabular grains contain 1-5 mol percent of silver iodide.
Dependencies are inferred from the claim text.