Developing apparatus and developer carrying member therefor

(19)

(11)

EP 0 516 419 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	31.03.1993 Bulletin 1993/13

(43)	Date of publication A2:
	02.12.1992 Bulletin 1992/49

(21)	Application number: 92304847.4

(22)	Date of filing: 28.05.1992

(51)	International Patent Classification (IPC)⁵: G03G 15/09

(84)	Designated Contracting States:
	DE FR GB IT

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Priority:

29.05.1991 JP 153962/91

(71)	Applicant: CANON KABUSHIKI KAISHA
	Tokyo (JP)

(72)	Inventors:
	Goseki, Yasuhide, c/o Canon Kabushiki Kaisha Ohta-ku, Tokyo (JP) Unno, Akira, c/o Canon Kabushiki Kaisha Ohta-ku, Tokyo (JP) Fujishima, Kenji, c/o Canon Kabushiki Kaisha Ohta-ku, Tokyo (JP)

(74)	Representative: Beresford, Keith Denis Lewis et al
	BERESFORD & Co. 2-5 Warwick Court High Holborn London WC1R 5DJ London WC1R 5DJ (GB)

(56)

References cited: :

(54)	Developing apparatus and developer carrying member therefor

(57) A developing apparatus (D) for developing an electrostatic latent image includes a movable developer carrying member (2) for carrying a one component developer (5) to a developing zone (7) in which the developer (5) is supplied to an electrostatic latent image bearing member (1); a regulating member (6) for regulating a thickness of a layer of the developer to be carried to the developing zone (7) on the developer carrying member (2); wherein the developer carrying member (2) includes a coating layer (10) comprising a resin arterial in which fine graphite particles are disposed, and wherein this coating layer triboelectrically charges the developer, and the triboelectric charging capacity of this coating layer (10) is larger in the middle region of the developer carrying member (2) than in the end regions in its longitudinal direction.

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