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AssigneeFuji Photo Film Co., Ltd.
InventorsMakoto Kikuchi, Mikio Ihama
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A silver halide photographic emulsion comprising grains, wherein 50% or more (numerical ratio) of all the grains are occupied by tabular grains with epitaxial junction meeting the requirements (i) to (v): (i) silver iodochlorobromide grains having (111) faces as main planes and having two parallel twin planes, (ii) an equivalent circle diameter of 3.0 μm or more and an aspect ratio of 8 or more, (iii) each of host tabular grains has six silver halide epitaxial junction portions selectively in apex portions thereof, (iv) at least one of the silver halide epitaxial junction portions has at least one dislocation line, and (v) a spacing between the two parallel twin planes of 0.012 μm or less.
A silver halide photographic emulsion comprising grains, wherein 50% or more (numerical ratio) of all the grains are occupied by tabular grains with epitaxial junction meeting the requirements (i) to (v):
Dependencies are inferred from the claim text.
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Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein: tabular grain emulsions
Tabular grain emulsions: aspect ratio of tabular grains in general; High aspect ratio; Intermediate aspect ratio; Low aspect ratio
Tabular grain emulsions: twinned crystal
Characterised by the crystal form or composition, e.g. mixed grain: epitaxial junction grains; Protrusions or protruded grains
Term end not estimated
This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2001-278592, filed Sep. 13, 2001, the entire content of which is incorporated herein by reference.
1. Field of the Invention
The present invention relates to a silver halide photographic emulsion of high speed and enhanced gradation, and further relates to a silver halide photographic lightsensitive material including the same.
Examples of the present invention will be described below, to which, however, the present invention is in no way limited.
(Preparation of Emulsion)
(Seed Emulsion A)