Ink droplet sensing means

Details Ink droplet sensing means Ink droplet sensing means

B - Operations, Transporting

41

J

101/96.02

B41J 2/125 (2006.01)

Patent

CA 1174722

-18- INK DROPLET SENSING MEANS Abstract of the Disclosure An ink droplet sensing means for detecting whether or not droplets are impinging on record media during ink jet printing operations. A synthetic foil having a metal layer is placed over a counter electrode having a rough surface on one side and a voltage is then applied to the electrode and the metal layer. Ink droplets impinging on the foil momentarily deflect the foil and cause a change in capacity which in turn causes a voltage change at the electrode. The voltage change is coupled through a capacitor and an amplifier and through recognition logic for evaluation of the signals.

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