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    • 11. 发明专利
    • PREPARATION OF SILVER HALIDE PHOTOGRAPHIC EMULSION AND SILVER HALIDE PHOTOGRAPHIC SENSITIVE MATERIAL
    • JPH0412345A
    • 1992-01-16
    • JP11456690
    • 1990-04-28
    • KONISHIROKU PHOTO IND
    • YOSHIDA TETSUYAMASUTOMI HARUHIKOICHIKAWA KAZUYOSHINAKAYAMA TOMOYOSHITAKIGUCHI HIDEKI
    • G03C1/015
    • PURPOSE:To obviate the fluctuation in functions among emulsion particles and to lessen the change in performance in an emulsion state as well as to obtain the photosensitive material having good reproducibility and preservable property by simultaneously adding the prescribed ratios of adsorptive additives to the emulsion and adding the additives to the emulsion while distributing the prescribed ratios to be added for the addition time longer than the average mixing time from the point of the time when the additives are added. CONSTITUTION:The prescribed ratios of the adsorptive additives to be added are simultaneously added to the silver halide emulsion particles and the additives are added thereto by distributing the prescribed ratios to be added for the addition time longer than the average mixing time from the point of the time when the additives are added in the case of addition of the above-mentioned additives for the silver halide emulsion particles by as much as the prescribed ratios to be added to the mother liquor of the silver halide photographic emulsion. Various kinds of such photographic additive are, therefore, adsorbed uniformly to the individual silver halide particles. The stable production of the silver halide photographic emulsion is executed in this way. The stability in the emulsion state and further, the preservable property of the photosensitive material coated with this emulsion and the performance thereof are improved.
    • 20. 发明专利
    • METHOD AND APPARATUS FOR PRODUCTION OF SILVER HALIDE PARTICLE
    • JPH06186656A
    • 1994-07-08
    • JP33747292
    • 1992-12-17
    • KONISHIROKU PHOTO IND
    • FUKAZAWA FUMIYOSHIMASUTOMI HARUHIKO
    • G03C1/00G03C1/015G03C1/035
    • PURPOSE:To form the more uniform twin crystal silver halide nucleus particles by providing the apparatus for forming the nucleus of the twin crystal silver halide nucleus particles with supply pipes for an aq. nitric acid soln. and an aq. halogen salt soln. and specifying the value obtd. by dividing the cross section perpendicular to the flow direction of both aq. solns. by the length of the boundary where both aq. solns. come into contact to a specific value or below. CONSTITUTION:This apparatus for forming the nucleus consists of concentrical double pipes, the outer side of which is the silver salt soln. 6 and the inner side of which is the aq. halogen salt soln. The terminal (wetting part 4) of the wall between the silver and the halogen is subjected to a taper treatment so that the sepn. of the fluid from the pipe wall does not arise. The wall in the central part of the pipe on the inner side is used to attain an adequate flow passage ratio in such a manner that both aq. solns. 6, 7 are more uniformly mixed. The value obtd. by dividing the sectional area of both aq. solns. 6, 7 perpendicular to the direction of the flow of both aq. solns. 6, 7 by the length of the boundary where both aq. solns. 6, 7 come into contact is