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US5364750A Direct positive silver halide photosensitive material 失效
直接正卤化银感光材料

Direct positive silver halide photosensitive material
Abstract:
The present invention relates to a direct positive photosensitive material comprising at least two kinds of core/shell-type internal latent image-type silver halide grains having different average grain sizes, the smaller grains being substantially constituted of cubic grains, or tetradecahedron grains mainly of the face (100). According to the present invention, a direct positive photosensitive material having a wide exposure latitude and an extremely improved storage stability can be obtained.
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