Silver halide photographic emulsion containing tabular grains with dislocations and method of preparing the same
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United States of America Patent
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Apr 7, 1998
Grant Date -
N/A
app pub date -
Feb 13, 1996
filing date -
Feb 15, 1995
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Abstract
A silver halide photographic emulsion is disclosed, which comprises core/shell type tabular silver halide grains having a diameter/thickness ratio of at least 2 and (111) faces as parallel main planes; wherein at least 30%, on a projected area basis, of the total silver halide grains are tabular grains which contain in their individual shells at least 15 dislocation lines reaching to the grain edges from the interface of the core and the shell and have the ratio of the shell part containing dislocation lines to the core, on a projected area basis, in the range shown as the shaded part in FIG. 1, thereby ensuring high sensitivity and high sharpness.
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