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(11) | EP 0 629 503 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Inkjet recording apparatus having electrostatic actuating means and method of controlling it |
| (57) An inkjet recording apparatus is provided with an inkjet head having a nozzle (4)
, an ink passage (6, 7, 8) that is connected to the nozzle, and an electrostatic actuator
composed of a diaphragm (5) that is provided in a part of the ink passage and an electrode
(21) placed outside of the ink passage opposite to the diaphragm. Recording is performed
by moving the diaphragm by means of an electrostatic force generated by applying a
voltage to the actuator thereby ejecting ink droplets from the nozzle. A drive circuit
for the actuator comprises a timing pulse generator, a charge circuit and a discharge
circuit. The drive circuit controls an amount of charge to be supplied to the actuator
as well as the charge rate, preferably corresponding to environmental operating conditions
of the recording apparatus. Thus a durably stable and precise ink ejection can be
realized. |