Diaphragm type ink jet head having a high degree of integration and a high ink discharge efficiency

A diaphragm type ink jet head comprising:

• an orifice plate provided on a substrate and including a section spaced from said substrate defining a cavity;
• pressure generating structure comprised of a buckling body having a configuration symmetrical about a center point of said buckling body and having a radially extending ribbed portion on an upper surface, wherein a peripheral edge portion of the buckling body is fixed to said substrate inside said cavity, and wherein a center portion of the buckling body is buckled by being heated to generate a pressure in said cavity;
• and
• a nozzle located in a position opposite to the pressure generating structure and formed in said orifice plate.

A diaphragm type ink jet head comprising:

• a substrate;
• pressure generating structure comprised of a buckling body having a configuration symmetrical about a center point of said buckling body and having a radially extending ribbed portion on an upper surface and a heater section for heating the buckling body, wherein a peripheral edge portion of the buckling body is fixed to said substrate, and wherein a center portion of the buckling body is buckled by being heated;
• an orifice plate including a section spaced from the pressure generating structure so as to cover the pressure generating structure with interposition of a gap, wherein a space between the orifice plate and one side edge portion of the buckling body is sealed by a spacer layer, and an ink supply path is formed between the orifice plate and the other side edge portion of the buckling body, such that the gap defines a cavity;
• and
• a nozzle which is provided as an ink discharge outlet and located in a position of the orifice plate opposite to a center portion of the pressure generating structure.