Patent ID: 6619777
Filing Date: 2003-09-16
Classification: B41J

Abstract:
A liquid jet apparatus comprising:a pressure generation element installed in correspondence to a pressure chamber interconnected to a nozzle opening, said pressure generation element adapted to be applied with a driving pulse thereby causing a pressure change to a liquid in said pressure chamber to eject a liquid drop from said nozzle opening; driving signal generation unit to generate a driving signal to be used for generating a plurality of kinds of said driving pulses for ejecting said liquid drop and a minute vibration pulse to be applied to said pressure generation element so as to finely vibrate a meniscus of said liquid; and pulse generation unit to generate said minute vibration pulse and said driving pulses by selecting a part of said driving signal, wherein said driving signal includes a plurality of waveform elements to be used to generate a plurality of kinds of said driving pulses and a connection element connecting said waveform elements between different voltage levels and not to be used to generate said driving pulses, wherein said pulse generation means generates said minute vibration pulse by a combination of at least a part of said waveform elements and at least a part of said connection element, and wherein said at least a part of said waveform elements is a preparatory waveform element which contracts said pressure chamber of a waiting condition without ejecting said liquid drop.