Image forming apparatus
AssigneeRicoh Company, Ltd.
InventorAkira Azami
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Abstract
In accordance with the present invention, in an image forming apparatus of the type developing a latent image formed on an image carrier, which moves at a linear velocity of 400 mm/sec or above, with a developer containing toner grains having a volume mean grain size of 5 μm to 10 μm and 60 number percent to 80 number percent of which has a grain size of 5 μm or below, the developer contains carrier grains having a weight mean grain size of 65 μm or below. When use is made of toner with a small grain size, the apparatus successfully obviates background contamination, toner scattering and sleeve contamination without regard to operation speed or environmental conditions.
Claims12
In an image forming apparatus for developing a latent image formed on an image carrier, which moves at a linear velocity of 400 mm/sec or above, with a developer containing toner grains having a volume mean grain size of 5 μm to 10 μm and 60 number percent to 80 number percent of which has a grain size of 5 μm or below, said developer contains carrier grains having a weight mean grain size of 65 μm or below.
In an image forming apparatus for developing a latent image formed on an image carrier, which moves at a linear velocity of 400 mm/sec or above, with a developer containing toner grains having a volume mean grain size of 5 μm to 10 μm and 60 number percent to 80 number percent of which has a grain size of 5 μm or below, 0.9 weight percent of silica or above and 0.4 weight percent of titanium oxide or above are coated on said grains.
Dependencies are inferred from the claim text.