Title: Electrographic devices and apparatus for non-electrostatically producing images from an original provided with a conductivity pattern

• Summary
• Claims
• Description
• View all

Abstract: Electrographic devices and apparatus comprising an original provided with a conductivity pattern ranging from a portion having a greater conductivity to a portion having a lesser conductivity, means for placing a thin layer of electrically chargeable particles in electric contact with said conductivity pattern, and means for generating an electric field of sufficient strength across said layer of electrically chargeable particles and said conductivity pattern so as to transfer electric charges from said conductivity pattern to said electrically chargeable particles so that said particles receive electric charges having different maximum values according to the different conductivities of said portions of said conductivity pattern whereby a portion of said particles are sufficiently charged and removed from said layer of electrically chargeable particles and the remainder of said particles are insufficiently charged so that they continue to remain in said particles layer thereby producing a stable electrographic image.


Do you think this is a good invention? Vote now: