Process and apparatus for electrographic recording utilizing contact liquid

Claim 1

An electrographic process for the production of charge images on a moving insulating recording strip material, said recording strip material being capable of being charged by a discharge current produced by a voltage between a corona discharge electrode and a recording electrode, imagewise charging of recording strip material by the action of the corona discharge current while moving across the record electrode, comprising the steps of producing a corona discharge from a discharge electrode, directing part of the corona discharge to a surface of the strip and subjecting the strip to the action of the discharge current while moving across the recording electrode, passing said part of the discharge current to said surface through an elongated gap defined by a diaphragm, producing an electric field between the recording electrode and the diaphragm and intensifying the contact of the more remote surface of the recording material and the recording electrode by applying a conducting liquid having a conductivity in the range of 10.sup. -4 to 10.sup. -9 ω.sup. -1 cm.sup. -1 .

Claim 11

An apparatus for electrographic recording of images on a neutral recording material comprising a discharge electrode for generating a substantially continuous supply of charge carriers, a diaphragm toward which said charge carriers are directed, a gap defined by said diaphragm through which said charge carriers are passing, a movable strip material having a surface movably adjacent to said gap for progressively receiving said charge carriers distributed laterally across the surface; a control electrode disposed at the side of the recording material more remote from the gap and extending laterally of the strip to control the intensity of the charge carriers and contact means for contacting said control electrode to said more remote side of the recording material, said contacting means including a conductive contact liquid having a conductivity in the range of 10.sup. -4 to 10.sup. -9 ω.sup. -1 cm.sup. -1 for rendering the charge carrier density homogeneous.

Claim 12

An apparatus for electrographic recording of images on a neutral recording material comprising a discharge electrode for generating a substantially continuous supply of charge carriers, a diaphragm toward which said charge carriers are directed, a gap defined by said diaphragm through which said charge carriers are passing, a movable strip material having a surface movably adjacent to said gap for progressively receiving said charge carriers distributed laterally across the surface; a control electrode disposed at the side of the recording material more remote from the gap and extending laterally of the strip to control the intensity of the charge carriers and contact means for contacting said control electrode to said more remote side of the recording material, said contacting means including a conductive contact liquid having a conductivity in the range of 10.sup. -4 to 10.sup. -9 ω.sup. -1 cm.sup. -1 for rendering the charge carrier density homogeneous.