Silver halide photographic emulsion
AssigneeFuji Photo Film Co., Ltd.
InventorsYoichi Maruyama, Genichi Furusawa
Life of this patent
Estimating the term…
Abstract
A silver halide photographic emulsion comprising grains, wherein not less than 50% of the number of all the grains are occupied by silver iodebromide or silver bromochloroiodide tabular grains each meeting the requirements (i) to (iii) below: (i) a thickness is less than 0.13 μm; (ii) an equivalent-circle diameter is not less than 1.0 μm; and (iii) a silver iodide content in a fringe internal region A between a twin plane and a grain major surface is higher than a silver iodide content in a fringe internal region B between two twin planes.
Claims17
A silver halide photographic emulsion comprising grains, wherein not less than 50% of the number of all the grains are occupied by silver iodobromide or silver bromochloroiodide tabular grains each meeting the requirements (i) to (iii) below:
- (i) a thickness is less than 0.13 μm;
- (ii) an equivalent-circle diameter is not less than 1.0 μm;
- and
- (iii) the tabular grains each have a fringe internal portion meeting the following requirements (a) and (b), the fringe internal portion consisting of a fringe internal region A1 sandwiched between a twin plane and a major surface closer to the twin plane, a fringe internal region A2 sandwiched between another twin plane and another major surface, and a fringe internal region B sandwiched between said twin planes:
- (a) a silver iodide content in the fringe internal region A1 and a silver iodide content in the fringe internal region A2 are substantially the same, and
- (b) the silver iodide content in each of the fringe internal regions A1 and A2 is higher than a silver iodide content in the fringe internal region B.
Dependencies are inferred from the claim text.