Electrophotographic development apparatus

An electrophotographic development apparatus, comprising:

• a toner support member;
• and
• a thin layer forming member for forming toner on the toner support member,
• wherein a distance L from a contact point of the toner support member to a free edge of the thin layer forming member is set to meet the following equation:
• 0<L≦r×(tan θ),
• where L denotes the distance, r an outer radius of the toner support member, and θ is an angle formed by the point, on the free edge of the thin layer forming member, closest to the toner support member at a position in an upstream side in an opposite direction from a rotational direction of the toner support member from a contact point of the thin film forming member and the toner support member.

An electrophotographic development apparatus, comprising:

• a toner support member;
• and
• a thin layer forming member for forming toner on the toner support member,
• wherein a distance L from a contact point of the toner support member to the free edge of the thin layer forming member is set to meet the following equation:
• 0<L≦r×(tan θ),
• where L denotes the distance, r an outer radius of the toner support member, and θ is an angle formed by the point, on the free edge of the thin layer forming member, closest to the toner support member at a position in a downstream side relative to a rotational direction of the toner support member from a contact point of the thin film forming member and the toner support member.

An electrophotographic development apparatus, comprising:

• a toner support member;
• and
• a thin layer forming member for forming toner on the toner support member,
• wherein a surface roughness Rz of the thin layer forming member, on the thin layer forming member surface facing the toner support member, is less than or equal to 6.65 μm.