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    • 2. 发明授权
    • High-contrast photographic elements with enhanced safelight performance
    • 高对比度摄影元素,增强了安全性能
    • US5372921A
    • 1994-12-13
    • US146558
    • 1993-11-02
    • Anthony D. GingelloRonald J. Schmidt
    • Anthony D. GingelloRonald J. Schmidt
    • G03C1/035G03C1/08G03C1/46G03C1/49
    • G03C1/46G03C1/035G03C1/08G03C1/49
    • A high-contrast room-light-handleable black-and-white silver halide photographic element that is especially useful in the field of graphic arts is comprised of a support, an imaging layer containing doped silver halide grains with a mean grain size of less than 0.12 micrometers, a print-out layer containing doped silver halide grains with a mean grain size in the range of from 0.14 to 0.4 micrometers, and a third set of doped silver halide grains with a mean grain size of less than 0.12 micrometers distributed within the print-out layer or within a separate safelight protection layer. Dopant levels are controlled so that the photographic speed of the imaging layer is higher than the photographic speed of the print-out layer and so that the photographic speed of the third set of silver halide grains is less than that of the imaging layer. The element utilizes very slow speed emulsions which render it capable of being handled in room light and is able to print-out a visible image on normal exposure and develop to full density upon being processed in conventional developing solutions.
    • 在图形领域中特别有用的高对比度室内光可处理的黑白卤化银照相元件由支撑体,含有平均晶粒尺寸小于等于的掺杂卤化银颗粒的成像层组成 0.12μm的平均晶粒尺寸为0.14至0.4微米的掺杂卤化银颗粒的印刷出层,以及平均粒径小于0.12微米的第三组掺杂的卤化银颗粒,其分布在 打印输出层或单独的安全保护层。 控制掺杂剂水平,使得成像层的照相速度高于打印输出层的照相速度,并且使得第三组卤化银颗粒的照相速度小于成像层的照相速度。 该元件使用非常慢速的乳液,使其能够在室内光下处理,并且能够在正常曝光下打印出可见图像,并且在常规显影溶液中进行处理时可发展成全密度。