| 摘要 |
PURPOSE:To improve the sensitivity in an infra-red spectral region, and the preservability of the title material by incorporating a specified infra-red sensitizing dye and a specified compd. in a silver halide emulsion. CONSTITUTION:The silver halide photographic emulsion contd. in the title material contains a combination of the infra-red sensitizing dye shown by formula I and the compd. shown by formula II, etc. In formulas I and II, R1 is alkyl or alkenyl group, R2 is alkyl or alkenyl group, etc., R4-R6 are each phenyl or benzyl group, etc., R3 is hydrogen atom or a lower alkyl group, etc., Z1 and Z3 are each an atomic group necessary for completing a 5 or 6 membered nitrogen contg. heterocyclic ring, Z2 is oxygen or sulfur atom, etc., Y is sulfur or selenium atom, R21 is hydrogen atom or alkyl group, etc., R22 is a lower alkyl or a monocyclic aryl group, etc., X is a pair ion residual group. Thus, the infra-red sensitivity and the preservability of the material are improved. |
