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(11) | EP 1 077 089 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Method for driving liquid drop spraying apparatus |
| (57) In an apparatus for spraying liquid drops, two pressure chambers (10n and lOn-1)
having the adjacent nozzle holes (11a), respectively start pressurization from time
T1, end pressurization at time T2, and hold its state until T3. Then, pressure reducing
is started from time T3, and pressure reducing is ended at time T4, and the cycle
for the next pressurization is repeated. In a duration from a time T3 when one pressure
chamber (10n) starts pressure reducing to time T5 when the next pressurization is
started, time T1 (-1) for starting pressurization of the other pressure chamber (10n-1)
is set. In this manner, the flow from one liquid introducing hole (12) back to the
common flow path (20) can be reduced when the other introducing hole is subjected
to such back flow. When the back flow caused by the other pressure chamber (10n-1)
starting pressurization reaches the introducing hole (12) of one of the adjacent pressure
chambers 10n, one pressure chamber 10n enters a state in which pressure reducing is
started. Liquid inflow due to pressurization is performed smoothly, charging can be
completed within a short period of time, and the time per cycle is reduced, whereby
a large amount of spraying can be performed. |