Patent ID: 7618106

Claim:
A liquid ejection head control method, comprising: (A) simultaneously generating a first drive signal and a second drive signal in a particular period, wherein the first drive signal has a plurality of first waveform sections whose voltages change from a reference voltage, follow voltage change patterns determined in correspondence with operations to be performed by an element that is in the liquid ejection head and that performs at least an operation for causing liquid to be ejected, and then return to the reference voltage, and the second drive signal has a plurality of second waveform sections whose voltages change from the reference voltage, follow voltage change patterns determined in correspondence with operations to be performed by the element, and then return to the reference voltage; (B) generating a plurality of first timing pulses that indicate generation start timings of the first waveform sections, respectively in correspondence with the plurality of first waveform sections, and generating a plurality of second timing pulses that indicate generation start timings of the second waveform sections, respectively in correspondence with the plurality of second waveform sections, wherein the first timing pulse corresponding to a first waveform section that is different from a particular first waveform section and that is generated subsequently after the particular first waveform section, and the second timing pulse corresponding to a second waveform section that is different from a particular second waveform section and that is generated subsequently after the particular second waveform section are generated at different timings, in an overlap period between generation periods of the reference voltage, one of the generation periods being from a generation end timing of the voltage change pattern in the particular first waveform section to a generation start timing of the voltage change pattern in the different first waveform section, the other generation period being from a generation end timing of the voltage change pattern in the particular second waveform section to a generation start timing of the voltage change pattern in the different second waveform section; and (C) applying either one of the first waveform section and the second waveform section to the element at a timing prescribed by either one of the first timing pulse and the second timing pulse, thereby causing the element to operate in accordance with the voltage change pattern in the applied waveform section.