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1. (WO2001005594) DROPLET VOLUME CALCULATION METHOD FOR A THERMAL INK JET PRINTER

Pub. No.:    WO/2001/005594    International Application No.:    PCT/IT2000/000296
Publication Date: Fri Jan 26 00:59:59 CET 2001 International Filing Date: Sat Jul 15 01:59:59 CEST 2000
IPC: B41J 2/05
Applicants: OLIVETTI TECNOST S.P.A.
SCARDOVI, Alessandro
Inventors: SCARDOVI, Alessandro
Title: DROPLET VOLUME CALCULATION METHOD FOR A THERMAL INK JET PRINTER
Abstract:
A method for detecting the volume (Vol) of the droplets of ink (22) ejected by a thermal ink jet printhead (11), comprising a continuous driving cycle during which one or more thermal ejection actuators (17) of the printhead (11) are driven in pulsing fashion with a driving energy (Ep) progressively increasing from a condition where no droplets are ejected, while the printhead (11) is maintained at a substantially constant stabilization temperature (Ts), notwithstanding the progressive increase in driving energy (Ep), by means of a heat control member (28) which absorbs and dissipates an appropriate feedbak energy (Er) in the printhead (11); wherein the quantities, correlated to each other in the course of the continuous driving cycle, of respectively the driving energy (Ep) fed to the ejection actuator (17) and the feedback energy (Er) absorbed and dissipated by the heat control member (28), to maintain the printhead (11) at the stabilization temperature (Ts), are acquired for the purpose of defining an experimental characteristic (50) representative of the continuous driving cycle, and in which the two linear end portions (51, 53) of this characteristic (50) are compared with each other in order to calculate, on the basis of their reciprocal deviation (ΔEp), the volume (Vol) of the droplets of ink (22) ejected by the ink jet printhead (11).