Patent ID: 7059538

Claim:
A method of applying fluid comprising: feeding fluid by a fluid feeding apparatus to an area between two faces positioned so as to maintain a gap therebetween, wherein the gap between the two faces can be changed by driving an actuator in order to intermittently discharge the fluid to the area between the two faces; providing an input signal in which a high-frequency component and a DC component are superimposed to drive the actuator for changing the gap between the two faces; and intermittently discharging the fluid located between the two faces for fluid application, wherein when a discharge time in the intermittent discharge process is expressed as T, an integral value of a discharge flow quantity of the fluid in a section of the discharge time T is expressed as Qsum, and an average discharge flow quantity Qave of the fluid is defined as Qave=Qsum/T, the actuator is driven so that the average discharge flow quantity Qave is set, by adjusting a duty ratio, a pulse density of the pulse waveform, a frequency of the pulse waveform, or an amplitude of the pulse waveform when an input the pulse waveform, or an amplitude of the pulse waveform when an input waveform of the high-frequency component is approximated to a pulse waveform, or an envelope pattern of the high-frequency component in initial and end points of the fluid application.