An apparatus for coating a photoreceptor substrate, such as a photoreceptor
belt or a photoreceptor drum, consists of at least one photoreceptor
coating fluid reservoir or diptank. The diptank defines an inlet at one
end and a conduit with an orifice at the other end. The conduit includes
at least one porous element such as a grid, screen or mesh arranged for
suspending a plurality of layers of non-contaminating rounded objects,
such as stainless steel or glass beads, in the bottom of the conduit.
Photoreceptor coating solution supplied to the inlet is thereby forced to
flow through the plurality of layers of beads prior to coating a
photoreceptor substrate that is inserted through the orifice. As a result,
the uniformity of the coating solution is improved as it coats the
photoreceptor substrate, thereby reducing coating defects in the finished
photoreceptor belt or drum.
