Electrophotograph development apparatus using magnetic developer

An electrophotograph development apparatus for developing an electrostatic latent image formed on an electrostatic latent image carrier body with magnetic developer, comprising:

• a developer carrier body having a magnetic roller;
• and
• a thin layer forming member for forming said magnetic developer on said developer carrier body into a thin layer,
• wherein a distance L from a contact point of said thin layer forming member with said developer carrier body to a free edge of said thin layer forming member is set so as to meet the following equation:
• 0<L≦(d/2)×tan θ+k, 0≦k≦1.5 mm,
• where L denotes the distance, d an outer diameter of said developer carrier body, k a constant, and θ is an angle formed by a magnetic pole of said magnetic roller disposed at a position in an upper stream side relative to a rotational direction of said developer carrier body from a contact point of said thin film forming member and said developer carrier body.

An electrophotograph development apparatus for developing an electrostatic latent image formed on an electrostatic latent image carrier body with magnetic developer, comprising:

• a developer carrier body having a magnetic roller;
• and
• a thin layer forming member for forming said magnetic developer on said developer carrier body into a thin layer,
• wherein a magnetic pole of said magnetic roller is disposed at a position of a θ degree in an upper stream side relative to a rotational direction of said developer carrier body from a contact point of said thin film forming member and said developer carrier body, and θ meets:
• 0 degree≦θ≦10 degree, and
• wherein a distance L from a contact point of said thin layer forming member with said developer carrier body to a free edge of said thin layer forming member is set so as to meet the following equation:
• 0<L≦(d/2×tan θ+k, 0≦k≦1.5 mm,
• where L denotes the distance, d an outer diameter of said developer carrier body and k a constant.

An electrophotograph development apparatus for developing an electrostatic latent image formed on an electrostatic latent image carrier body with magnetic developer, comprising:

• a developer carrier body having a magnetic roller;
• and
• a thin layer forming member for forming said magnetic developer on said developer carrier body into a thin layer,
• wherein a distance Ii from a contact point of said thin layer forming member with said developer carrier body to a free edge of said thin layer forming member is set so as to meet the following equation:
• 0<L≦(d/2)×tan θ,
• where L denotes the distance, d an outer diameter of said developer carrier body, and θ is an angle formed by a magnetic pole of said magnetic roller disposed at a position in an upper stream side relative to a rotational direction of said developer carrier body from a contact point of said thin film forming member and said developer carrier body.

An electrophotograph development apparatus for developing an electrostatic latent image formed on an electrostatic latent image carrier body with magnetic developer, comprising:

• a developer carrier body having a magnetic roller;
• and
• a thin layer forming member for forming said magnetic developer on said developer carrier body into a thin layer,
• wherein a magnetic pole of said magnetic roller is disposed at a position of a θ degree in an upper stream side relative to a rotational direction of said developer carrier body from a contact point of said thin film forming member and said developer carrier body, and θ meets:
• 0 degree≦θ≦10 degree, and
• wherein a distance L from a contact point of said thin layer forming member with said developer carrier body to a free edge of said thin layer forming member is set so as to meet the following equation:
• 0<L≦(d/2)×tan θ,
• where L denotes the distance, d an outer diameter of said developer carrier body.