Radiation imagery chemistry: process – composition – or product th – Including control feature responsive to a test or measurement
Patent
1995-10-27
1997-12-30
Huff, Mark F.
Radiation imagery chemistry: process, composition, or product th
Including control feature responsive to a test or measurement
430569, G03K 1015
Patent
active
057028516
ABSTRACT:
A method of producing a silver halide photographic emulsion in which a silver ion concentration in precipitation of a silver halide emulsion in a precipitation bath is controlled, wherein a precipitation bath in which stirring is conducted rapidly and uniformly, and crystal formation and crystal growth are uniformly performed is used, the method comprises the steps of: in a start period of precipitation, quantitavely adding a silver nitrate solution and a halogen salt solution at a constant ratio flow rate; when an E.sub.Ag value reaches a designated E.sub.Ag value region in the vicinity of a preset target E.sub.Ag value, starting a control of an adding rate of the halogen salt solution by using a controller which has an operation period equal to or shorter than 1 sec.; and after holding a tuning parameter of a proportional, integral and differential (PID) action controller to a minimum response level, conducting a control in which the tuning parameter is switched to an optimum control tuning parameter which corresponds to the preset target value and a solute rate of silver/halogen ions to be added.
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Photographic Emulsion Chemistry, G.F. Duffin, The Focal Press, London & New York, pp. 12-15.
Saito Hirokazu
Tada Sugihiko
Fuji Photo Film Co. , Ltd.
Huff Mark F.
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