| US 7,524,042 B2 | ||
| Ink jet printers and methods | ||
| Meir Weksler, Mazkeret Batia (Israel); Yehoshua Sheinman, RaAnana (Israel); and Ilan Ben-Shahar, Nes Ziona (Israel) | ||
| Assigned to Jemtex Ink Jet Printing Ltd., Lod (Israel) | ||
| Filed on Aug. 25, 2006, as Appl. No. 11/509,658. | ||
| Application 11/509658 is a division of application No. 10/475523, granted, now 7,104,634, previously published as PCT/IL02/00346, filed on May 02, 2002. | ||
| Claims priority of provisional application 60/288097, filed on May 03, 2001. | ||
| Prior Publication US 2006/0284942 A1, Dec. 21, 2006 | ||
| Int. Cl. B41J 2/125 (2006.01) | ||
| U.S. Cl. 347—81 | 23 Claims |
| 1. A method of printing a desired pattern on a substrate, comprising:
discharging a continuous stream of liquid ink drops from a nozzle along the nozzle axis towards the substrate;
selectively charging said liquid ink drops with multilevel charges for selectively deflecting them different amounts with
respect to the nozzle axis to thereby direct some of the liquid ink drops to different locations on the substrate for printing
said desired pattern thereon, while other liquid ink drops not to be printed are intercepted by a gutter before reaching the
substrate;
illuminating the stream of liquid ink drops discharged from the nozzle with stroboscopic light at the frequency of the drop
formation;
optically sensing and displaying an image of the illuminated stream of liquid drops and the distance between the first and
last drops;
and calculating the velocity of the liquid drops according to the image displayed.
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