(19)
(11) EP 0 642 064 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
06.09.1995 Bulletin 1995/36

(43) Date of publication A2:
08.03.1995 Bulletin 1995/10

(21) Application number: 94306493.1

(22) Date of filing: 02.09.1994
(51) International Patent Classification (IPC)6: G03G 15/20
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 03.09.1993 JP 220022/93

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

(72) Inventors:
  • Matsuda, Tomiyasu, c/o Mita Industrial Co., Ltd.
    Chuo-ku, Osaka 540 (JP)
  • Ohira, Naruhisa, c/o Mita Industrial Co., Ltd.
    Chuo-ku, Osaka 540 (JP)
  • Iwagawa, Isao, c/o Mita Industrial Co., Ltd.
    Chuo-ku, Osaka 540 (JP)
  • Ohashi, Takashi, c/o Mita Industrial Co., Ltd.
    Chuo-ku, Osaka 540 (JP)

(74) Representative: Barlow, Roy James 
J.A. KEMP & CO. 14, South Square Gray's Inn
London WC1R 5LX
London WC1R 5LX (GB)


(56) References cited: : 
   
       


    (54) Heat fixing apparatus


    (57) A heat-fixing apparatus for use in an electrophotographic apparatus such as a copying machine. It comprises a substrate roller formed of a material having a heat conductivity of 0.7 kcal/mhk or less, a resistant heat-generating layer provided on the surface of the roller, and a surface coat layer provided on the resistance heat-generating layer. This heat-fixing apparatus has a very high heat efficiency, and can perform heat-fixing of a toner at a low consumption of electric power. In addition, since the heating is carried out rapidly, the rising time is markedly shortened, and it is not necessary to perform pre-heating. In this respect, too, the electric power to be consumed is decreased. Furthermore, since it is a roller-type fixing method, it can effectively cope with high-speed copying. Moreover, because the apparatus has a large strength, the apparatus can be effectively made light in weight.






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