RESTRICTOR WITH STRUCTURE FOR PREVENTING BACK FLOW AND INKJET HEAD HAVING THE SAME

摘要

A restrictor with a structure for preventing back flow and an ink-jet head having the same are provided to achieve smooth refilling of ink by reducing flow resistance of ink. A piezoelectric ink-jet head includes an ink channel and a piezoelectric actuator(140). The ink channel is formed on a channel forming plate(100) and includes an ink inlet(161), a plurality of pressure chambers(164), a manifold(162) connected to the ink inlet, a plurality of restrictors(163) which connect each of the pressure chambers to the manifold and have a plurality of protrusions(172) inside to increase flow resistance of ink which flows from the pressure chambers to the manifold, and a plurality of nozzles(166) connected to the pressure chambers. The piezoelectric actuator is located at a position of the channel forming plate corresponding to the pressure chambers.