Electricity: electrical systems and devices – Electric charging of objects or materials
Patent
1998-12-17
2000-10-17
Sherry, Michael J.
Electricity: electrical systems and devices
Electric charging of objects or materials
361233, 361235, H05F 300
Patent
active
061340952
ABSTRACT:
A particularly configured aperiodic grid for a grid-controlled AC corona charger for uniformly charging a dielectric member, of an electrostatographic reproduction apparatus, moving along a travel path in operative relation to the corona charger. The corona charger includes an insulating housing and an electrically biased grid, in which the grid transparency is larger than a nominal transparency at the upstream edge of the charger grid, transparency is nominal at the center of the grid, and transparency is smaller than nominal at the downstream edge of a charger grid. The invention, which has been demonstrated for negative primary charging, preferably uses a trapezoidal AC waveform having a DC offset for corona excitation, and may be practiced over a large range of process speeds. The invention is also practiced using trapezoidal waveforms having negative duty cycles in the range 50% (conventional AC) to 90% (negative DC). The range of the variation in grid transparency from the upstream grid edge to the downstream grid edge is far greater than in prior art commercial machines.
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Kenyon Dennis A.
May John W.
Maye Bonnie A.
Pernesky Martin J.
Smith Dean R.
Kessler Lawrence P.
Sherry Michael J.
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