(19)
(11) EP 0 690 354 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
28.08.1996 Bulletin 1996/35

(43) Date of publication A2:
03.01.1996 Bulletin 1996/01

(21) Application number: 95304501.0

(22) Date of filing: 27.06.1995
(51) International Patent Classification (IPC)6: G03G 9/087
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 29.06.1994 JP 147285/94

(71) Applicant: MITA INDUSTRIAL CO. LTD.
Osaka 540 (JP)

(72) Inventors:
  • Inoue, Kazushige, c/o Mita Industrial Co., Ltd.
    Osaka-shi, Osaka 540 (JP)
  • Kuramae, Yoshihisa, c/o Mita Industrial Co., Ltd.
    Osaka-shi, Osaka 540 (JP)
  • Nagai, Takashi, c/o Mita Industrial Co., Ltd.
    Osaka-shi, Osaka 540 (JP)
  • Takatsuna, Tohru, c/o Mita Industrial Co., Ltd.
    Osaka-shi, Osaka 540 (JP)

(74) Representative: W.P. THOMPSON & CO. 
Eastcheap House Central Approach
Letchworth, Hertfordshire SG6 3DS
Letchworth, Hertfordshire SG6 3DS (GB)

   


(54) Method for contact type development


(57) The method uses a positive charging toner 7 wherein a resin having a trialkylammonio group at the side chain is blended as an electric charge controlling material, in combination with a positive charging photoconductor 1 wherein a single-layer type positive charging organic photosensitive layer is formed on the surface of an electroconductive substrate. Thereby, a good image having a high image density can be formed without causing image fog.






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