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    • 3. 发明授权
    • Silver halide photographic materials
    • 卤化银照相材料
    • US5302506A
    • 1994-04-12
    • US901130
    • 1992-06-19
    • Nobuaki KagawaShinri Tanaka
    • Nobuaki KagawaShinri Tanaka
    • C09B23/06G03C1/18G03C1/29
    • C09B23/06G03C1/18G03C1/29
    • The improved silver halide photographic material is such that the silver halide grains contained in at least one light-sensitive silver halide emulsion layer are spectrally sensitized with a sensitizing dye represented by the following general formula: ##STR1## where R.sup.1 and R.sup.2 each represents an alkyl group having 1-10 carbon atoms or an alkenyl group having 3-10 carbon atoms; R.sup.3 represents a hydrogen atom, a heterocyclic group, an aryl group or an alkyl group; R.sup.4 and R.sup.5 each represents an alkyl group; Z.sup.1 represents the group of non-metallic atoms necessary to form a 5-membered monocyclic or condensed nitrogenous hetero ring; L.sup.1 and L.sup.2 each represents a methine group, provided that R.sup.1 or R.sup.2 may combine with L.sup.1 or L.sup.2, respectively, to form a 5- or 6- membered hereto ring; X.sup.1 represents an ion that cancels an electric charge in the molecule; .sup.1 represents the number of ions necessary to cancel electric charges in the molecule. The silver halide photographic material has an enhanced spectral sensitivity in the red wavelength range while causing less color contamination.
    • 改进的卤化银照相材料使得至少一种感光卤化银乳剂层中所含的卤化银颗粒用由以下通式表示的增感染料进行光谱增感:(*化学结构*)(I)其中R1 R2各自表示碳原子数1〜10的烷基或碳原子数3〜10的烯基, R3表示氢原子,杂环基,芳基或烷基; R4和R5各自表示烷基; Z1表示形成5元单环或缩合含氮杂环所必需的非金属原子团; L1和L2各自表示次甲基,条件是R1或R2可以分别与L1或L2结合形成5-或6-元环; X1表示分子中抵消电荷的离子; 1表示在分子中消除电荷所需的离子数。 卤化银照相材料在红色波长范围内具有增强的光谱灵敏度,同时引起较少的颜色污染。