Silver halide emulsion and silver halide photographic material by the use thereof
AssigneeKonica Corporation
InventorsRieko Ren, Tomoyuki Nakayama
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Abstract
Silver halide emulsions are disclosed comprising tabular silver halide grains containing dislocation lines in the peripheral region of the major faces; the tabular grains comprising a high iodide phase which is internal to and along the dislocation lines and an internal region which is surrounded by the high iodide phase and comprised of substantially homogeneous silver halide phase and having an average iodide content of not more than 1 mol %. Silver halide photographic materials by the use of the emulsion are also disclosed.
Claims56
A silver halide emulsion comprising silver halide grains wherein the silver halide grains meet the following requirement:
- (a) at least 50% of total grain projected area is accounted for by tabular grains having an aspect ratio of not less than 5
- (b) a coefficient of variation of total grain size distribution is not more than 25%;
- (c) an average iodide content of total grains is not more than 4 mol;
- and
- (d) the tabular grains each have major faces and contain dislocation lines in the peripheral region of the major face, and the tabular grains comprising a high iodide phase which is internal to and along the dislocation lines and an internal region surrounded by the high iodide phase, the internal region being comprised of substantially homogeneous silver halide phase and having an average iodide content of not more than 1 mol %
- and wherein the silver halide grains further satisfy the following equation (2):
- It≦1.8/x equation (2)
- wherein It represents the average iodide content of the grains and x represents an average equivalent cube edge length (μm).
A silver halide emulsion comprising silver halide grains wherein the silver halide grains meet the following requirement:
- (a) at least 50% of total grain projected area is accounted for by tabular grains satisfying the following equation (1-1):
- A≧4(x)1/2 equation (1-1)
- wherein A represents an aspect ratio and x represents an average equivalent cube edge length (μm)
- (b) a coefficient of variation of total grain size distribution is not more than 25%;
- (c) an average iodide content of total grains is not more than 4 mol;
- and
- (d) the tabular grains each have major faces and contain dislocation lines in the peripheral region of the major face, and the tabular grains comprising a high iodide phase which is internal to and along the dislocation lines and an internal region surrounded by the high iodide phase, the internal region being comprised of substantially homogeneous silver halide phase and having an average iodide content of not more than 1 mol %.
Dependencies are inferred from the claim text.