(19)
(11) EP 0 264 192 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.04.1990 Bulletin 1990/15

(43) Date of publication A2:
20.04.1988 Bulletin 1988/16

(21) Application number: 87308168.1

(22) Date of filing: 16.09.1987
(51) International Patent Classification (IPC)4: G03C 1/485, G03C 7/38
(84) Designated Contracting States:
DE FR GB IT NL

(30) Priority: 16.09.1986 JP 217691/86

(71) Applicant: KONICA CORPORATION
Tokyo 163 (JP)

(72) Inventors:
  • Tosaka, Yasuo
    Odawara-shi Kanagawa-ken (JP)
  • Suzuki, Fujitugu
    Odawara-shi Kanagawa-ken (JP)
  • Kuramoto, Kazuya
    Odawara-shi Kanagawa-ken (JP)
  • Ueda, Bunzo
    Odawara-shi Kanagawa-ken (JP)
  • Inahata, Hideki
    Odawara-shi Kanagawa-ken (JP)

(74) Representative: Wood, Anthony Charles et al
Urquhart-Dykes & Lord 91 Wimpole Street
London W1M 8AH
London W1M 8AH (GB)


(56) References cited: : 
   
       


    (54) Direct positive silver halide light-sensitive photographic material


    (57) The material comprises a support and a silver halide emulsion layer thereon containing direct positive silver halide grains adapted to form an internal latent image upon imagewise exposure and being unpre-fogged, and a compound represented by general formula [I],

    wherein Z represents a group of non-metallic atoms necessary to complete a nitrogen-containing heterocyclic ring which may have a substituent; X represents a hydrogen atom or a substituent capable of being split off upon reaction with an oxidation product of a color developing agent; and R represents a hydrogen atom or a substituent. The emulsion has a maximum density which is sufficiently large and a minimum density which is sufficiently small. The foot portion of the density/exposure curve can exhibit high contrast while the highlight portion shows little or no tendency towards magenta color.





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