Appeal No. 1999-1574
Application No. 08/321,324
electrodes. In conventional image forming apparatuses, each
apparatus is controlled in accordance with the voltage to be
applied to each control electrode. Thus, a problem arises
that the cost of the driving circuit is high.
The image forming apparatus according to the present
invention includes a carrier for carrying charge particles,
and electric-field controller that is disposed so as to face
the carrier and for directly controlling the charge particles
within the electric field, and a back electrode that is
disposed so as to face the carrier through the electric-field
controller. Electric-field controller has openings through
which the charge particles pass. The apparatus also includes
a plurality of electrode units that are disposed adjacent the
openings, the plurality of electrode units being time-
divisionally driven. The plurality of electrodes are time-
divisionally driven, and electric-field control operation is
effectively performed. Accordingly, if data electrodes and
selection electrodes are used, an image recording operation
can be properly performed because both of the electrodes can
provide sufficient toner flying (supplying) force to the
toner, and in addition, the number of driving ICs can be
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