Inkjet printer head
View Patent ↗In accordance with one embodiment, an inkjet head comprises a plurality of groove-shaped pressure chambers formed on piezoelectric members of which the polarization directions are opposite, and a nozzle plate arranged at the lateral side of the pressure chambers across a lid section with high rigidity. A plurality of through holes connected to a plurality of nozzles formed on the nozzle plate is formed in the lid section. The inkjet head is set in a range of 10-25% before and after a center, that is, a length ratio where the relation between ejection voltage of ink ejected from the nozzles and a length ratio between the length of the through hole of the lid section in the longitudinal direction of the pressure chamber and the length of the pressure chamber in the longitudinal direction of the pressure chamber is minimized.
1. An inkjet head comprising:
a pressure chamber configured to be formed on piezoelectric members of which the polarization directions are opposite, the pressure chamber having a groove-shape;
a nozzle plate arranged at the lateral side of the pressure chamber across a lid section with high rigidity; and
a lid section in which a through hole connected to a nozzle formed on the nozzle plate is formed; and
a ratio of a diameter of the through hole to a length of the pressure chamber in a longitudinal direction is in the range of 10-25%, the diameter of the through hole being a length of the through holes in the longitudinal direction.
2. The inkjet printer head according to claim 1 , wherein
the lid section is formed by a material of which Young's modulus is 100˜200 GPa.
3. The inkjet printer head according to claim 2 , wherein
the lid section is metal with a low coefficient of thermal expansion.
4. The inkjet printer head according to claim 3 , wherein
the inkjet printer head is a side shooter type device serving as a share mode share wall type inkjet printer head.
5. The inkjet printer head according to claim 4 , wherein
the piezoelectric member includes two PZT laminating plates of which the polarization directions are opposite.