Liquid ejection head
AssigneeRISO Technologies Corporation
InventorRyutaro KUSUNOKI
Life of this patent
Estimating the term…
Abstract
A liquid ejection head includes nozzles for ejecting a liquid, pressure chambers communicating with the nozzles, a supply-side flow path, an ejection-side flow path, and piezoelectric elements. When a viscous resistance of each nozzle is Rn, an inertial resistance of each nozzle is Mn, a meniscus compliance of each nozzle is Cn, viscous and inertial resistances of the supply-side flow path are Rm1 and Mm1, viscous and inertial resistances from the supply-side flow path to each nozzle are Rc1 and Mc1, viscous and inertial resistances from each nozzle to the ejection-side flow path are Rc2 and Mc2, and resistance and inertial resistances of the ejection-side flow path are Rm2 and Mm2, and M=Mn+1/(1/Mc1+1/Mc2)+1/(1/Mm1+1/Mm2), R=Rn+1/(1/Rc1+1/Rc2)+1/(1/Rm1+1/Rm2), ω=(M×Cn)−1/2, and γ=R/2/M, 0.2≤γ2/ω2≤1.0 is satisfied.
Claims15
A liquid ejection head comprising:
- a nozzle plate having a plurality of nozzles for ejecting a liquid;
- a plurality of pressure chambers respectively communicating with the plurality of nozzles;
- a supply-side flow path on one side of the plurality of pressure chambers in one direction;
- an ejection-side flow path on the other side of the pressure chambers in the one direction;
- and
- a plurality of piezoelectric elements configured to deform when a voltage is applied to drive the pressure chambers, wherein
- when a viscous resistance of each of the nozzles is defined as Rn, an inertial resistance of each of the nozzles is defined as Mn, a meniscus compliance of each of the nozzles is defined as Cn, viscous and inertial resistances of the supply-side flow path are defined as Rm1 and Mm1, viscous and inertial resistances from the supply-side flow path to each of the nozzles are defined as Rc1 and Mc1, viscous and inertial resistances from each of the nozzles to the ejection-side flow path are defined as Rc2 and Mc2, and resistance and inertial resistances of the ejection-side flow path are defined as Rm2 and Mm2, and
- M=Mn+1/(1/Mc1+1/Mc2)+1/(1/Mm1+1/Mm2),
- R=Rn+1/(1/Rc1+1/Rc2)+1/(1/Rm1+1/Rm2),
- ω=(M×Cn)−½, and
- γ=R/2/M,
- 0.2≤γ2/ω2≤1.0 is satisfied.
Dependencies are inferred from the claim text.