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Improving Latent Electrostatic Images

IP.com Disclosure Number: IPCOM000094929D
Original Publication Date: 1965-Jul-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Woodward, DH: AUTHOR

Abstract

Developed density D(o) depends on the spatial charge distribution P(x) of the separated charges forming a latent image pattern. For example. in the case of dielectric coated paper, the charge distribution of separated charges, + charges on one side of the dielectric coating and - charges on the other side, across the thickness of the paper after the latent image is formed may look like curve B.

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Improving Latent Electrostatic Images

Developed density D(o) depends on the spatial charge distribution P(x) of the separated charges forming a latent image pattern. For example. in the case of dielectric coated paper, the charge distribution of separated charges, + charges on one side of the dielectric coating and - charges on the other side, across the thickness of the paper after the latent image is formed may look like curve B.

By placing a high voltage field of at least 1200 V per inch across the paper of a polarity of the same direction as the charge separation. the charge distribution may be modified as shown by curve A. This represents a decrease in the average distance of charge separation L(AV). According to the formula for D(o), the developed density increases tending to produce a better developed image. If the field polarity is reversed, L(AV) is increased and D(o) decreased as shown by curve C with a degradation of developed image.

Stated another way, the paper on which the dielectric Material is coated apparently can trap charges. Consequently, in a normal transfer operation the charge does not completely migrate through the paper to the interface between the dielectric and paper. This is desirable since the electric fields associated with the charge pattern on the surface of the dielectric is sharper if the charges migrate completely through the paper to the interface between the paper and the dielectric. To facilitate this, an intense electric fie...