PRODUCING DEVICE OF SILVER HALIDE EMULSION AND PRODUCING METHOD

PROBLEM TO BE SOLVED: To obtain a silver halide emulsion having excellent controlling ability or the particle size and aspect ratio and having high sensitivity providing the producing device with a means to control the emulsion volume in a reaction vessel at an optional point during growing the planer silver halide particles. SOLUTION: In the initial stage, the reaction vessel 6 houses a dispersion medium and a silver halide emulsion containing silver halide particles after subjected to a nuclei forming process or ageing process. A liquid amt. monitoring device 4 monitors the liquid amt. in the reaction vessel 6 and sends the measured value of the liquid amt. to a controller 13. Set values of time and liquid amt. preliminarily determined are stored in the controller 13 before the formation of particles is started. If the liquid amt. at the set time is less than the set value of the liquid amt., a flow amt. controlling device 2 is opened according to the signals from the controller 13 to introduce the liquid from a liquid container 1 for increasing the liquid amt. to increase the liquid amt. in the container 6. If the liquid amt. is more than the set value, a drain amt. controlling device 9 is opened to control the drain amt. of waste water from an ultrafiltration unit 8 to control the liquid amt. in the vessel 6.