Variable frequency ink jet printer

摘要

A method and apparatus are disclosed in which deflection and print speed are controlled by varying the nozzle drive frequency to increase or decrease drop velocity thereby to control drop deflection. The variation is done in a manner to maintain the ratio lambda /d and drop size substantially constant. By altering the drop velocity the transit time of the drops through the high voltage deflection field is changed, permitting increased or decreased deflection. The system includes a pressure controller, a velocity sensor, a variable frequency nozzle drive and a processor. Calculations and operations are performed by the processor, based on the size of an operator selected image.