Abstract: A high resolution printing method is disclosed, implemented in a printer in which a continuous ink jet is broken up into drops (G) in a charging electrode (6) where they are selectively charged electrostatically, said drops then pass between deflection electrodes (9), the appearance of a satellite drop (Sn) from a main drop is caused by application of an appropriate voltage in the charging electrode during formation of said main drop and the coalescence of a satellite drop thus formed intended for printing with the following main drop is prevented, also by application of a voltage to the charging electrode during the formation of said main drop.

Abstract: A method and device are provided for measuring the propagation time of a wave, wherein a wave is transmitted modulated in amplitude by a modulation signal. The wave reflected by an obstacle is received after a propagation time and the amplitude thereof is detected. The average value of the product of the detected signal and a reference signal is calculated and the delay with respect to the modulation signal is controlled so as to cancel out the average value. The modulation signal and the reference signal comprise a succession of elementary signals chosen so as to allow, in a single measurement, a long propagation time to be determined without ambiguity and with high accuracy.