WET-TYPE IMAGE FORMATION APPARATUS

摘要

When a toner charging amount for toner in a liquid developer conveyed to a development portion is set, a wet-type image formation apparatus performs a sensing operation in which a sensing unit senses image densities of a plurality of patch images formed at different development biases with the toner charging amount being set to a constant value, and a setting operation in which, in a case where a control unit calculates current development characteristics based on the image densities of the plurality of patch images sensed by the sensing unit, and determines that the current development characteristics are not included within a set target range, the control unit controls a charging unit to set the toner charging amount such that the development characteristics are included within the set target range.

主权项

1. A wet-type image formation apparatus forming an image on a recording medium, comprising:
an image carrier carrying an electrostatic latent image; a developer carrier conveying a liquid developer to a development portion serving as a position facing said image carrier, to develop said electrostatic latent image and form a toner image; a charging unit charging toner in said liquid developer conveyed to said development portion; an application unit applying a development bias to said developer carrier; a sensing unit sensing an image density of said toner image; and a control unit controlling said charging unit based on information about a set target range of development characteristics prepared beforehand, wherein a toner charging amount setting operation is performed when a toner charging amount for the toner in said liquid developer conveyed to said development portion is set, and said toner charging amount setting operation includes
a sensing operation in which said sensing unit senses image densities of a plurality of patch images formed at different development biases with said toner charging amount being set to a constant value, anda setting operation in which, in a case where said control unit calculates current development characteristics based on the image densities of said plurality of patch images sensed by said sensing unit, and determines that said current development characteristics are not included within said set target range, said control unit controls said charging unit to set said toner charging amount such that the development characteristics are included within said set target range.