(19)
(11) EP 0 301 579 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
28.11.1990 Bulletin 1990/48

(43) Date of publication A2:
01.02.1989 Bulletin 1989/05

(21) Application number: 88112348.3

(22) Date of filing: 29.07.1988
(51) International Patent Classification (IPC)4: G03C 1/015
(84) Designated Contracting States:
DE GB NL

(30) Priority: 30.07.1987 JP 188736/87

(71) Applicant: FUJI PHOTO FILM CO., LTD.
Kanagawa 250-01 (JP)

(72) Inventors:
  • Ichikawa, Yasunori Fuji Photo Film Co., Ltd.
    Minami Ashigara-shi Kanagawa (JP)
  • Ohnishi, Hiroshi Fuji Photo Film Co., Ltd.
    Minami Ashigara-shi Kanagawa (JP)
  • Kojima, Akira Fuji Photo Film Co., Ltd.
    Minami Ashigara-shi Kanagawa (JP)
  • Kato, Akira Fuji Photo Film Co., Ltd.
    Minami Ashigara-shi Kanagawa (JP)

(74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät 
Maximilianstrasse 58
80538 München
80538 München (DE)


(56) References cited: : 
   
       


    (54) Photographic photosensitive solution manufacturing method and apparatus


    (57) A method and apparatus for manufacturing photographic photosensitive solution to produce crystals of silver halide emulsion having a uniform size and shape and without substan­tial waste of expensive Ag⁺ solution. Flow control valves for controlling the flow rates of Ag⁺ and X⁻ solutions are controlled according to a predetermined flow rate or pAg potential program and using output signals of respective flow meters or a pAg potentiometer. The flow control valves are motor-controlled flow control valves for which the rate of change of flow rate with valve stroke is small and linear.







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