Lawrence E. Contois

Duplication Of Continuous Tone Images Using Electrophotographic Films

Duplication of high-quality continuous-tone photography requires a capability to accept broad ranges of contrast and maximum density in the original negative. An electrophoto-graphic system using liquid toner and a final-imaging photoconductive film has been shown to meet these requirements. The system can be applied in continuous roll duplication of high-quality originals. A description is given of the special characteristics and control of the photoconductive film that make it applicable in this system, taking advantage of the property of persistent conductivity to augment conventional electrostatic image formation.