Process and apparatus for rendering visible charge images
AssigneeHoechst Aktiengesellschaft
InventorsRoland Moraw, Gunther Schadlich
Life of this patent
Estimating the term…
Abstract
A process and apparatus for rendering visible an electrostatic charge image. The visible image is formed on the surface of a liquid by positioning a charge image adjacent the liquid at distances of about 10 to 1,000 .mu.m from the surface of the liquid without contacting the liquid.
Claims11
A process for rendering visible an electrostatic charge image by deforming the surface of a liquid having a resistivity of between 10.sup.6 and 10.sup.16 ohm.multidot.cm and a polarizability of between about 5.multidot.10.sup.-24 and 20.multidot.10.sup.-24 cm.sup.3 and being present in a thickness of 10 to 100 .mu.m on one of a metallic and dielectric support into a reversible, optically readable relief image, comprising the steps of positioning the electrostatic charge image producing the relief image--during the period in which the charge image is made visible--at a distance of about 10 to 1,000 .mu.m from the surface of the liquid without contacting said liquid.
A process for rendering visible an electrostatic charge image by deforming the surface of a liquid having a resistivity of between 10.sup.6 and 10.sup.16 ohm.multidot.cm and a polarizability of between about 5.multidot.10.sup.-24 and 20.multidot.10.sup.-24 cm.sup.3 and being present in a thickness of 10 to 100 .mu.m on one of a metallic and dielectric support into a reversible, optically readable relief image, comprising the steps of positioning the electrostatic charge image producing the relief image--during the period in which the charge image is made visible--at a distance of about 50 to 150 .mu.m from the surface of the liquid without contacting said liquid.
Dependencies are inferred from the claim text.