Process for developing, image-forming apparatus, and image-forming process cartridge

An image-forming apparatus, comprising:

• a latent electrostatic image support;
• a charger which charges the latent electrostatic image support;
• a light irradiator which irradiates a light to the latent electrostatic image support charged by the charger imagewisely so as to form a latent electrostatic image;
• a developer which comprises a development sleeve facing the latent electrostatic image support, introduces a developing agent so as to form a plurality of magnetic brushes, provides the developing agent with the latent electrostatic image, and renders the latent electrostatic image visible so as to form a developed image;
• and
• a transfer, which transfers the developed image formed by the developer to a transfer medium,
• wherein the developing agent is supplied with a density of 1.3 g/cm3 to 2.0 g/cm3 at the closest part between the latent electrostatic image support and the development sleeve;
• the latent electrostatic image support is contacted with a plurality of the magnetic brushes on the development sleeve, so that a plurality of the magnetic brushes have a width of 2 mm or less at a linearly contacting surface, in a direction where the linearly contacting surface of the magnetic brushes rotates, and
• the developing agent contains toners, and carriers which comprise magnetic core particles and resin layers to cover a surface of the magnetic core particles, the carriers have a weight average particle diameter of 25 μm to 45 μm, the carriers contain 60% by weight or more of carrier particles having a particle diameter of less than 44 μm, and 7% by weight or less of carrier particles having a particle diameter of less than 22 μm.

An image-forming process cartridge, comprising:

• a latent electrostatic image support;
• and
• a developer which comprises a development sleeve facing the latent electrostatic image support, introduces a developing agent so as to form a plurality of magnetic brushes, provides the developing agent with the latent electrostatic image, and renders the latent electrostatic image visible so as to form a developed image,
• wherein the process cartridge is formed in a one-piece construction and is attachable to and detachable from an image-forming apparatus;
• the developing agent is supplied with a density of 1.3 g/cm3 to 2.0 g/cm3 at the closest part between the latent electrostatic image support and the development sleeve;
• the latent electrostatic image support is contacted with a plurality of the magnetic brushes on the development sleeve, so that a plurality of the magnetic brushes have a width of 2 mm or less at a linearly contacting surface, in a direction where the linearly contacting surface of the magnetic brushes rotates, and
• the developing agent contains toners and carriers which comprise magnetic core particles and resin layers to cover a surface of the magnetic core particles, the carriers have a weight average particle diameter of 25 μm to 45 μm, the carriers contain 60% by weight or more of carrier particles having a particle diameter of less than 44 μm, and 7% by weight or less of carrier particles having a particle diameter of less than 22 μm.