Accession Number:

AD0673881

Title:

CONTINUOUS-TONE ELECTROPHOTOGRAPHY.

Descriptive Note:

Final rept. 4 Jan-22 Sep 67,

Corporate Author:

RCA LABS PRINCETON N J

Report Date:

1968-08-01

Pagination or Media Count:

51.0

Abstract:

Two approaches to the experimental investigation of the electric fields near a charged and imaged zinc oxidebinder layer were made, to elucidate the role of electrostatic induction of the field near a discontinuity between charged and discharged areas 1 Steps to construct a 0.001-in. -diam. probe for exploring the electric field near a charged zinc oxidebinder layer were developed and 2 micrographs of a layer charged uniformly and then discharged in a bar pattern by light have been made in a scanning electron microscope. Analysis of the micrographs indicates the results to be a function of the field near the surface, but this has not been confirmed. Basic mechanisms and forces occurring in liquid development of Electrofax were investigated, and a literature search was performed. Two mechanisms for charging particles are discussed acid-base equilibrium and specific adsorption. The principal transport process for bringing particles to the deposition site is by electrophoretic focus. A dielectrophoretic transport mechanism can be a factor in divergent fields. The two principal forces holding particles on the Electrofax paper are electrostatic andor van der Waals. The point in the deposition at which charge neutralization takes place, to date, has not been determined. The role of particle size on time deposition and the key factors in continuous-tone development are discussed. Author

Subject Categories:

  • Photography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE