INK DROPLET PASSAGE TIME DETERMINATION METHOD, INK DROPLET SPEED CALCULATION METHOD, AND INK JET PRINTER

摘要

PROBLEM TO BE SOLVED: To provide a method capable of correctly calculating a flying speed of ink droplets with a relatively simple and inexpensive method.;SOLUTION: The times of passage of ink droplets through the vicinity of two detection electrodes 4a, 4b are measured by detecting the voltage induced in the detection electrodes 4a, 4b following the passage of electrified ink droplets in the two detection electrodes 4a, 4b installed along a flying path of ink droplets. The flying speed of ink droplet is calculated on the basis of the difference in the measured times and a distance between the two detection electrodes 4a, 4b. At this time, the first time at which the induced voltage is equal to or greater than a prescribed threshold Vt and the second time at which the induced voltage is less than the threshold Vt are measured in the two detection electrodes 4a, 4b, and the third time obtained by adding the half value of the difference between the second time and the first time to the first time is determined as the time of passage of ink droplets through the detection electrodes 4a, 4b.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2017,JPO&INPIT