Ink jet printing head
AssigneesShinshu Seiki Kabushiki Kaisha, Kabushiki Kaisha Suwa Seikosha
InventorHaruhiko Koto
Life of this patent
Estimating the term…
Abstract
An ink jet printing head of simple construction includes two supply channels and a pressure chamber which are substantially coplanar with the nozzle. A piezoelectric element acts to decrease the pressure chamber volume and eject an ink droplet from the nozzle. A smoothly curved supply channel inlet assures that vapor in the pressure chamber is easily removed. Ink refills the pressure chamber from a transverse supply pipe feeding two supply channels when the chamber volume increases after ejection of a drop.
Claims16
An ink jet printer head for an ink-on-demand jet type printer, comprising:
- a baseplate;
- a vibration plate fixedly abutting said baseplate;
- a pressure chamber for containing ink having substantially parallel opposed walls, one said parallel wall being a portion of said baseplate, the other said parallel wall being a portion of said vibration plate;
- a piezoelectric element attached to said vibration plate, electrical energization of said piezoelectric element causing said parallel wall of said vibration plate to deflect, internal volume of said pressure chamber being reduced by said vibration plate deflection;
- an ink nozzle communicating between said pressure chamber and an external surface of said ink jet print head, wherethrough ink from said chamber is ejected;
- a first ink supply channel communicating between a supply of ink and said pressure chamber, the inlet of said first ink supply channel to said pressure chamber being opposite to said ink nozzle;
- one wall of said first supply channel and said ink nozzle being substantially coplanar with one said parallel wall of said pressure chamber, another wall of said first supply channel and said ink nozzle being substantially coplanar with the other parallel wall of said pressure chamber;
- a second ink supply channel communicating between said supply of ink and said ink nozzle;
- said second ink supply channel has one wall substantially coplanar with one said parallel wall of said pressure chamber, another wall of said second ink supply channel being substantially coplanar with the other parallel wall of said pressure chamber.
An ink jet printing head for an ink-on-demand jet type printer, comprising:
- a baseplate;
- a vibration plate fixedly abutting said baseplate;
- a pressure chamber for containing ink having substantially parallel opposed walls, one said parallel wall being a portion of said baseplate, the other said parallel wall being a portion of said vibration plate;
- a piezoelectric element attached to said vibration plate, electrical energization of said piezoelectric element causing said parallel wall of said vibration plate to deflect, the internal volume of said pressure chamber being reduced by said vibration plate deflection;
- an ink nozzle communicating between said pressure chamber and an external surface of said ink jet print head, wherethrough ink from said chamber is ejected;
- an ink supply channel communicating between a supply of ink and said pressure chamber, the inlet of said supply channel to said pressure chamber being opposite to said ink nozzle;
- a dividing element at the entrance to said pressure chamber from said ink supply channel, ink flowing into said pressure chamber from said ink supply channel being divided into two streams by said dividing element.
Dependencies are inferred from the claim text.