Positively purged print cartridge

Details Positively purged print cartridge Positively purged print cartridge

1992-07-13

1993-09-07

Miller, Jr., George H.

Recorders

Electric recording

Electrochemical

31511181, G01D 1506

Patent

active

052433650

ABSTRACT:
In electrostatic imaging utilizing a silent electric discharge, nitrogen or other controlled gas is supplied to the discharge region. First and second control fingers each having first and second ends and a number of active openings along their lengths, provide electrodes at the discharge region. The controlled gas is supplied to the discharge regions through first and second gas input channels each connected to either the first ends or second ends of both the control fingers. The charge output associated with the active openings in the control fingers is stabilized so that there is a substantially even distribution of charge output along the length of each control finger by providing first and second bleed holes associated with each of the control fingers, and closer to the gas input channel than are the active openings in the control fingers. Each bleed hole has a surface area of approximately three times that of a single active opening if each control finger has sixteen active openings, and the bleed holes are preferably formed in a screen electrode overlying the control fingers.

REFERENCES:
patent: 4890123 (1989-12-01), McCallum et al.
patent: 4918468 (1990-04-01), Miekka et al.
patent: 5107284 (1992-04-01), Cyman et al.

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