Developing device, process cartridge, and image forming apparatus

A process cartridge detachable from a main body of an image forming apparatus, comprising:

• an image carrier on which a latent image is formed;
• and
• a developing device which contains developer having toner carriers and toners and develops the latent image formed on the image carrier;
• wherein
• the developing device includes
• a developing roller disposed to face the image carrier for carrying the developer by a magnetic force;
• and
• a toner carrier capturing roller disposed to face the developing roller for capturing the toner carriers adhered onto the image carrier by a magnetic force;
• the developing roller generates a magnetic pole at a side facing the toner carrier capturing roller, and a first virtual line, which connects a rotational center of the developing roller to a rotational center of the toner carrier capturing roller, passes through a region between a position where a magnetic flux density of the magnetic pole in a normal line direction is minimum on the developing roller at the upstream side in the rotational direction of the developing roller and a position where the magnetic flux density of the magnetic pole in the normal line direction is maximum on the developing roller.

An image forming apparatus which forms an image on a recording medium, comprising:

• a process cartridge detachable from a main body of the image forming apparatus;
• wherein
• the process cartridge includes
• an image carrier on which a latent image is formed;
• and
• a developing device which contains developer having toner carriers and toners and develops the latent image formed on the image carrier;
• the developing device includes
• a developing roller disposed to face the image carrier for carrying the developer by a magnetic force;
• and
• a toner carrier capturing roller disposed to face the developing roller for capturing the toner carriers adhered onto the image carrier by a magnetic force;
• the developing roller generates a magnetic pole at a side facing the toner carrier capturing roller, and a first virtual line, which connects a rotational center of the developing roller to a rotational center of the toner carrier capturing roller, passes through a region between a position where a magnetic flux density of the magnetic pole in a normal line direction is minimum on the developing roller at the upstream side in the rotational direction of the developing roller and a position where the magnetic flux density of the magnetic pole in the normal line direction is maximum on the developing roller.