Patent ID: 6416169
Filing Date: 2002-07-09
Classification: B41J

Abstract:
A microelectromechanical system based fluid ejector, comprising:a faceplate having at least one ejector nozzle; a substrate on which the faceplate is mounted; a cylinder structure between the faceplate and the substrate, the cylinder structure having a first endwall and a second endwall that at least partially define a chamber that communicates with the at least one ejector nozzle, the second end wall located a predetermined distance from the least one ejector nozzle; and a movable piston arranged to move in the chamber away from the first endwall towards the second endwall with a predetermined maximum stroke, the predetermined maximum stroke being less than the predetermined distance such that viscous resistance against movement of the piston towards the second wall by a fluid in the chamber is primarily a result of sheer flow of the fluid between the piston and an inner circumference of the cylinder structure.