Sequentially pulsed overlapping field multielectrode corona charging method and apparatus
AssigneeCoulter Systems Corporation
InventorHarold J. Weber
Life of this patent
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Abstract
A sequential corona charging method including apparatus therefor which acts to provide several corona fields, each of its own distinct origin, which are brought together with some spatial overlap to act collectively to provide uniform charge current distribution throughout the surface of an electrophotographic medium. Independence from non-uniform charging brought about by the undesirable effects of electrostatic repulsion between adjacent electric corona fields is achieved through the rapid controlled on and off sequencing of overlapping field corona regions so that the active time coincident therebetween is negligible.
Claims33
Corona charging method whereby several overlapping electrically pulsed corona field regions act collectively to provide an effectively uniform charge current distribution throughout a charge receptor proximate therewith through the combination of:
- a. establishing at least two coeffective electrically pulsed corona field regions which may adjacently overlap in space and which are at least efficaciously alternate in time.
Corona charging apparatus including a plurality of corona-producing electrodes, effective for producing several electrically pulsed corona field regions which act collectively to provide an effectively uniform average current flow throughout a coactive charge receptor by establishing at least two coeffective electrically pulsed corona field regions between the said electrodes and the charge receptor which may adjacently overlap in space and which are at least efficaciously alternate in time, including in combination:
- a. a plurality of corona field producing electrode means superposed with a charge receptor and having juxtapositional orientation therebetween which produces a predetermined amount of overlap of the adjacent corona fields;
- b. a plurality of electric corona potential producing means, each effectively coupled with a separate said electrode means;
- and,
- c. a control means for sequencing the electric corona potential so that at least adjacent corona fields are produced in effective alternation.
Corona charging apparatus including a plurality of corona field producing electrodes superposed proximate with a charge receptor, whereby at least individual adjacent said corona fields are functionally intimate with the usual deleterious result that electrostatic repulsion may coexist therebetween, whereby improvement is found in the combination of at least alternately sequencing the said electric corona producing potential coupled with at least the adjacent electrodes and repeating said sequencing in a rapid cyclic predetermined order between all the said electrodes.
Dependencies are inferred from the claim text.