Patent ID: 7101439

Claim:
A fluid application device comprising: an application nozzle including a discharge opening directed to face an object that relatively travels with respect to the application device, said application nozzle discharging liquid fluid from the discharge opening and applying the fluid to the object; a first tank storing the fluid to be applied to the object; a second tank connected to said first tank; feeding means for feeding the fluid from said first tank and supplying the fluid toward said second tank; a supply path for connecting said second tank to said application nozzle and allowing the fluid in said second tank to be supplied to said application nozzle; pressurizing means for sealing an inside of said second tank and applying a prescribed air pressure to the sealed inside of said second tank; fluid level-detecting means for detecting a fluid level of the fluid in said second tank; and maintaining means for controlling a fluid supply performed by said feeding means based on a detection result of said fluid level-detecting means and maintaining the fluid level at a fixed level, wherein said application nozzle further includes: a main body having a tip end with the discharge opening, and a passage defined inside the main body and tapered toward the discharge opening; a valve needle arranged in the main body, for opening and closing the discharge opening, the valve needle having a stepped shape of which the diameter decreases in stages toward the discharge opening and which corresponds in position to the passage; a contact surface formed on the tip end of the main body, the contact surface spreading around a circumference of the discharge opening and being brought into contact with the object; a discharge hole extending from the discharge opening toward inside of the main body and guiding flow of the fluid from the inside of the main body; a corner face formed along the circumference of the discharge opening and chamfering a boundary between an inner wall of the discharge hole and the contact surface into a curved surface; and a coating layer formed on a surface of the main body and covering a region from the contact surface including a corner face to the inner wall of the discharge hole.