Direct positive-type silver halide light-sensitive photographic material

Claim 1

A direct positive type silver halide photographic light-­sensitive material comprising a support having thereon at least one blue-sensitive silver halide emulsion layer, at least one green-sensitive silver halide emulsion layer and at least one red-sensitive silver halide emulsion layer, which, after being imagewise exposed, are to directly form a positive image by being light-fogged while in developing or by developing in the presence of a fogging agent, wherein each of said silver halide emulsion layers is comprised of at least two silver halide emulsions being different in the average silver halide grain size, and in each of said emulsion layers, then average diameter S of silver halide grains of the emulsion having the smallest average grain size and the average diameter L of silver halide grains of the emulsion having the largest average grain size have a proportional relation of 1.6 ≦ L/S; and the ratio by weight of silver haide grains of the emulsion having the smallest average grain size in each silver halide emulsiom layer to the whole silver halide grains contained in each silver halide emulsion layer is within the range of from 2% to 50% in said blue-sensitive emulsion layer, from 2% to 40% in said green-sensitive and red-sensitive emulsion layers; and said blue-sensitive emulsion layer contains at least one sensitizing dye represented by the following Formula I, said green-sensitive emulsion layer contains at least one sensitizing dye represented by the following Formula II and said red-sensitive emulsion layer contains at least one sensitizing dye represented by the following Formula III, wherein Z₁ and Z₂ each represents a group of atoms necessary to complete a ring of benzothiazole, naphthothiazole, benzo­selenazole or naphthoselenazole; R₁ and R₂ each represents an unsubstituted or substituted alkyl group, provided that at least one of the R₁ and R₂ represents an alkyl group substituted by a sulfo group or a carboxyl group; X₁⁻ represents an anion; and ℓ represents an integer of 1 or 2, wherein Z₃ and Z₄ each represents a group of atoms necessary to complete a ring of benzoxazol or naphthoxazole; R₃ and R₄ each represents an unsubstituted or substituted alkyl group, provided that at least one of the R₃ and R₄ represents an alkyl group substituted by a sulfo group or a carboxyl group; R₅ represents a lower alkyl group; X₂⁻ represents an anion; and m represents an integer of 1 or 2, wherein Z₅ and Z₆ each represents a group of atoms necessary to complete a ring of benzothiazole, naphthothiazole, benzo­selenazole, or naphthoselenazole; R₆ and R₇ each represents an unsubstituted or substituted alkyl group, provided that at least one of the R₆ and R₇ represents an alkyl group substituted by a sulfo group or a carboxyl group; R₈ represents an alkyl group or an aryl group; X₃⁻ represents an anion; and n represents an integer of 1 or 2.