LIGHT LOCK FOR CORONA DEVICE

摘要

A device having corona discharge means for generating a flow of ions arranged within a chamber that is part of a dielectric housing and is provided with an elongated opening extending to the side of the housing positionable adjacent the surface of a moving sheet or web of dielectric or photosensitive material to be treated. The opening is covered with a metal screen or a small diameter rod can be arranged relative to the opening. The chamber is lined with an electrically conductive shield. The opening is of sufficient length so that it will extend across and beyond the side edges of the sheet or web that will be moved with respect thereto. Between the corona discharge means and the metal screen, an electrically conductive and biased steering rod is arranged to direct the flow of ions from said corona discharge means through said opening. An electrically conductive and biased plate is arranged between the corona discharge means and the steering rod to shape the electrical field established relative to the surface of the material to focus the flow of ions toward the screen and to prevent irradiation from said corona discharge means from passing through said opening and damaging the material being treated. The device can be used with either an AC or DC source of potential applied to the corona discharge means depending upon the type of material being treated.