Recorders – Electric recording – Electrochemical
Patent
1990-12-26
1992-07-14
Fuller, Benjamin R.
Recorders
Electric recording
Electrochemical
346155, G01D 1506
Patent
active
051307278
ABSTRACT:
The present invention is a method and apparatus which solves the problem of rapidly calibrating to a uniform value, the ion current (i) associated with each modulation electrode (50) of a print array (40) in an ionographic printing head (10). The calibration data may then be used during printing to produce high quality images of uniform density. The present invention employs a calibration array (30) positioned to sense the ion current (i) associated with each opposing modulation electrode (50) as a voltage (V(i)) across a calibration electrode (70) load resistance (R). When the instantaneous value of ion current (i) and the desired calibrated ion current (i.sub.F) differ when presented to a comparator, a feedback circuit (62) feeds back an error voltage (V.sub.INT) to a driver (100) coupled to the modulation electrode (50). The modulation voltage (Vm(i)) and the error voltage (V.sub.INT) are combined at the driver (100) input, producing a calibrated modulation voltage (Vm(i)') which adjusts the ion current (i) to the calibrated value. Calibrated modulation voltage (Vm(i)') is read and stored for later use during the printing, or used in real time depending on the time constants of the feedback circuit (62) and the speed of printing desired. Voltage (V(i)) indicative of calibrated ion current (i.sub.F) may also be read if desired.
REFERENCES:
patent: 5003327 (1991-03-01), Theodoulou et al.
Fuller Benjamin R.
Gibson Randy W.
Xerox Corporation
LandOfFree
Feedback scheme for ionographic calibration does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Feedback scheme for ionographic calibration, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Feedback scheme for ionographic calibration will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-338025