Ink jet printing apparatus

Details Ink jet printing apparatus Ink jet printing apparatus

1982-05-10

1983-11-29

Hartary, Joseph W.

Recorders

Record receiver deforming

346140R, G01D 1800

Patent

active

044183526

ABSTRACT:
An ink jet printing apparatus uses as its charge detection means a gutter which is made of a conductive material, insulated from collected ink and grounded through a resistor. A charging electrode is supplied with charging voltage pulses for a phase search intermittently at a predetermined period which is at least two times the period of a drive frequency of ink droplets. The resultant voltage appearing across the resistor is amplified and filtered to pick out a pulse signal of the predetermined period. The resistance of the resistor between the gutter and the ground is preselected to be sufficiently smaller than that of the ink.

REFERENCES:
patent: 3465351 (1969-09-01), Keur et al.
patent: 3969733 (1976-07-01), De Moss et al.
patent: 4370664 (1983-01-01), Horika et al.
patent: 4374387 (1983-02-01), Iyoda et al.

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