DIPOLE DEVELOPMENT FOR IONOGRAPHY
Original Publication Date: 1990-Apr-30
Included in the Prior Art Database: 2004-Apr-05
Xerox Disclosure Journal
An investigation of the physics of ionographic electroreceptors determined that the ideal thickness "L" for an electroreceptor should be W/2
XEROX DISCLOSURE JOURNAL
DIPOLE DEVELOPMENT FOR Proposed Classification IONOGRAPHY U.S. C1.355/251
Inan Chen Int. C1. G03g 15/09
An investigation of the physics of ionographic electroreceptors determined that the ideal thickness "L" for an electroreceptor should be W/2 <L< W, where 'W is the pixel size. This means that for higher resolutions, the receptor thickness should decrease proportionately. With conventional charged toner development, which is controlled by the latent image potential, a thinner electroreceptor requires a larger image charge density to maintain the same development rate. For increased process speeds, this requirement for large charge density in a shorter time could exceed the feasibility limit of the technology.
In dipole development, e.g. as described in U.S. Patent 4,124,287, the force on polarizable toner particles is determined by the field gradient due to the image charge distribution. For xerography, a disadvantage of dipole development is the additional step of creating the microscopically non-uniform charge distribution needed for the field gradient.
In ionography, the latent image consists of discrete dot patterns of charge. Provided that there is no significant overlap between neighboring dots, the field gradient required for dipole development exists without any additional step during image formation.
The dipolar force on a spherical particle of radius r and dielectric constant k in the field E is given by:
F = [4neor3(k-l)/(k +...