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AssigneeFuji Photo Film Co., Ltd.
InventorsTsutomu Miyasaka, Tadaaki Tani, Tadao Sugimoto
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A silver halide photographic material is disclosed containing at least one silver halide emulsion layer, in which (1) the silver halide grains constituting the emulsion layer have been spectrally sensitized by at least one adsorbable spectral sensitizing dye added thereto before the completion of chemical ripening of the grains, and (2) at least one luminous dye which has a quantum efficiency of 0.1 or more when the concentration thereof in dry gelatin at room temperature is 10.sup.-4 mol/dm.sup.3 and which can be substantially completely removed by development is added to a hydrophilic dispersion medium for the emulsion layer exclusive of the silver halide grains in a concentration of 2.0 mmol/dm.sup.3 in the dispersion medium. The addition of the spectral sensitizing dye is not limitative and can be either before the completion of the formation of the silver halide grains or during a stage from the completion of the formation of the grains to the completion of the chemical ripening thereof. By the combination of the spectral sensitization by the adsorbable spectral sensitizing dye and light-collecting sensitization by the luminous dye, the spectral sensitivity of the silver halide in the material is unexpectedly improved.
A silver halide photographic material containing at least one silver halide emulsion layer, in which (I) the silver halide grains constituting the emulsion layer have been spectrally sensitized by at least one adsorbable spectral sensitizing dye added thereto before the completion of the formation of said grains, and (2) at least one luminous dye which has a quantum efficiency of 0.1 to 1.0 when the concentration thereof in dry gelatin at room temperature is 10.sup.-4 mol/dm.sup.3 and which can be substantially completely removed by development is added to a hydrophilic dispersion medium of the silver halide emulsion layer in a concentration of 2.0 mmol/dm.sup.3 or more, exclusive of the silver halide grains, in the dispersion medium, which luminous dye is capable of adsorbing visible light and fluorescing in the visible region and in which the luminous dye in the dispersion medium is substantially non-adsorbable and the adsorbability of the dye to the silver halide grains is 5.times.10.sup.-7 mol/m.sup.2 or less in an aqueous 5% (by weight) gelatin solution of silver bromide grains having a (III) crystal plane at a temperature of 40.degree. C. and a pH value of 6.5.+-.0.05 and a dye concentration of 10.sup.-4 mol/liter of said solution phase.
A silver halide photographic material containing at least one silver halide emulsion layer, in which (1) the silver halide grains constituting the emulsion layer have been spectrally sensitized by at least one absorbable spectral sensitizing dye added thereto during the stage from the completion formation of the grains to the completion of the chemical ripening thereof, and (2) at least one luminous dye which has a quantum efficiency of 0.1 to 1.0 when the concentration therein in dry gelatin at room temperature is 10.sup.-4 mol/dm.sup.3 and which can be substantially completely removed by development is added to a hydrophilic dispersion medium of the silver halide emulsion layer in a concentration of 2.0 mmol/dm.sup.3 or more, exclusive of the silver halide grains, in the dispersion medium, which luminous dye is capable of adsorbing visible light and fluorescing in the visible region and in which the luminous dye in the dispersion medium is substantially non-adsorbable and the adsorbability of the dye to the silver halide grains is 5.times.10.sup.-7 mol/m.sup.2 or less in an aqueous 5% (by weight) gelating solution of silver bromide grains having a (III) crystal plane at a temperature of 40.degree. C. and a pH value of 6.5.+-.0.05 and a dye concentration of 10.sup.-4 mol/liter of said solution phase.
A silver halide photographic material as in claim 5, in which the quantum efficiency of the luminous dye is 0.5 to 1.0.
Dependencies are inferred from the claim text.