| 摘要 |
PURPOSE:To obtain a silver halide photographic emulsion excellent in photographic stability and resistance to pressure sensitivity, by using said emulsion composed of a prescribed proportion of silver bromide, iodide, and chloride prepared by a specified method, and contg. a photographic coupler. CONSTITUTION:The silver halide particles in the emulsion is prepared by the below mentioned method ( I ) and are composed of >=50mol% silver bromide, <=10mol% silver iodide, and the rest of silver chloride, and their surfaces are coated with a chemically sensitized photographic silver halide contg. a photographic coupler. In the method ( I ), silver ions and halogen ions are added in the presence of protective colloid, at a prescribed value of pAg, by the double jet method to produce silver halide, and at that time, a soln. contg. Br ions and Cl ions in ratio Y in order to control pAg, where Y=KX(b/a), a+b+c=100, (a), (b), (c) are each mol% of silver bromide, chloride, and iodide. |
