Driving method of liquid drop ejecting head and liquid drop ejecting apparatus

A driving method of a liquid drop ejecting head in which an oscillatory wave is imparted to a liquid accommodated in a pressure chamber using an electromechanical transducer which is driven when a predetermined driving waveform is applied to the electromechanical transducer, thereby discharging a liquid drop from a nozzle to record an image, the driving method comprising:

• detecting an environmental temperature, and
• expanding and/or contracting the driving waveform to be applied to the electromechanical transducer, in a voltage axial direction and/or a time axial direction, in accordance with the detected environmental temperature and applying the resulting driving waveform to the electromechanical transducer, wherein
• the expansion and/or contraction of the driving waveform are carried out in the voltage axial direction and time axial direction such that the magnitude of the driving waveform is increased as the detected environmental temperature becomes lower,
• the expansion and/or contraction of the driving waveform are carried out such that the expansion ratio and/or contraction ratio of the driving waveform becomes constant with respect to a reference potential,
• in the driving waveform to be applied to the electromechanical transducer, a waveform of a reverberation adjustor, which adjusts a residual oscillation of the liquid, is adjusted in accordance with the detected environmental temperature and is applied to the electromechanical transducer,
• the shape of the waveform of the reverberation adjustor is changed such that the residual oscillation is amplified as the detected environmental temperature becomes lower,
• the shape of the waveform of the reverberation adjustor is changed such that the residual oscillation is suppressed as the detected environmental temperature becomes higher.