Patent ID: 7645018

Claim:
A method of discharging liquid droplets of a liquid material, comprising: providing a liquid discharging apparatus comprising a metering tube having a columnar internal space formed substantially the same diameter, a plunger whose tip face closely contacts an inner wall surface of the metering tube, a storage container filled with the liquid material, a flow passage communicating the metering tube with the storage container, a liquid material supplying valve on the flow passage, a discharge valve disposed at a nozzle side distal end of the metering tube, and a nozzle in communication with the discharge valve; supplying the metering tube with the liquid material by moving the plunger rearward to a first position while the liquid material supplying valve is in the open position and the discharge valve is in the closed position; moving the plunger forward from the first position and stopping the plunger at a second position while the liquid material supplying valve is in the closed position and the discharge valve is in the open position, thereby discharging a first droplet from the nozzle; and moving the plunger forward from the second position and stopping the plunger at a third position while the liquid material supplying valve is in the closed position and the discharge valve is in the open position, thereby discharging a second droplet from the discharge port, wherein speed of the plunger from a start of a deceleration to a stop of the plunger is controlled during the steps of moving forward and stopping the plunger such that the first droplet and the second droplet are of the same quantity, without abruptly stopping the plunger, and wherein the liquid material supplied in the metering tube in a single supplying step is discharged from the discharge port in a plurality of steps of moving the plunger forward.