Developer for developing electrostatic images and image forming apparatus

An apparatus unit comprising:

• a photosensitive member;
• a contact charging means, a developing means for developing an electrostatic image formed on the photosensitive member with a developer which comprises a toner, and negatively chargeable spherical resin particles having an average particle size of 0.03-1.0 micron and a volume resistivity of 10.sup.6 -10.sup.12 ohm.cm;
• wherein at least one of said contact-charging means and developing means is supported integrally together with said photosensitive member to form a single unit, which can be connected to or released from an apparatus body as desired.

A facsimile apparatus, comprising:

• an electrophotographic apparatus and a receiving means for receiving image data from a remote terminal, wherein said electrophotographic apparatus comprises:
• a contact-charging means for charging a photosensitive member for bearing an electrostatic image while contacting the photosensitive member, and
• a developing means for developing an electrostatic image formed on the photosensitive member with a developer which comprises a toner, and negatively chargeable spherical resin particles having an average particle size of 0.03-1.0 micron and a volume resistivity of 10.sup.6 -10.sup.12 ohm.cm.