Spectrally sensitized silver halide photographic emulsion

Claim 1

A silver halide photographic emulsion containing, in combination, supersensitizing amounts of (A) at least one sensitizing dye of the following formula (I) ##EQU5## wherein Z 1 represents an atomic group required for forming a benzimidazole ring or a β-naphthimidazole ring; Z 2 represents an atomic group required for forming a benzoxazole ring or a β-naphthoxazole ring; R 1 and R 2 each represents an aliphatic group with at least one or R 1 and R 2 representing an alkyl group having a carboxy group or an alkyl group having a sulfo group; R 3 represents a hydrogen atom or an alkyl group; X 1 represents an acid anion; and m is 1 or 2, and when m is 1 the dye forms an intramolecular salt, wherein the benzimidazole ring formed by Z 1 , is substituted in the 5 position with a halogen atom, an alkylcarbonyl group, or an alkoxy carbonyl group, and (B) at least one sensitizing dye of the following general formula (II) ##EQU6## wherein Z 3 represents an atomic group required for forming a benzoxazole ring or a β-naphthoxazole ring; Z 4 represents an atomic group required for forming a benzothiazole ring, a benzoselenazole ring, a β-naphthothiazole ring or a β-naphthoselenazole ring; R 6 represents a hydrogen atom or an alkyl group; R 4 and R 5 each represents an aliphatic group with at least one of R 4 and R 5 representing an alkyl group having a carboxy group or an alkyl group having a sulfo group; X 2 represents an acid anion; and n is 1 or 2, and when n is 1 the dye forms an intramolecular salt.