Liquid ejection head
AssigneeCanon Kabushiki Kaisha
InventorMasataka Kato
Life of this patent
Estimating the term…
Abstract
A liquid ejection head has on one surface of a substrate a liquid flow path having an ejection orifice and a liquid generating energy generating element while the element is protected against liquid by an insulating layer formed on the surface. The liquid ejection head further has a liquid inflow path and a liquid outflow path each running through the substrate and the insulating layer to circulate liquid. The liquid inflow path and the liquid outflow path each have a first opening on the surface of the substrate and a second opening on the surface of the insulating layer and for each of the liquid inflow and outflow paths, the end on the ejection orifice side of the second opening is located closer to the ejection orifice than the end on the ejection orifice side of the first opening.
Claims12
A liquid ejection head comprising:
- a liquid flow path having an ejection orifice;
- and
- an energy generating element for generating energy for ejecting liquid from the flow path through the ejection orifice,
- the liquid flow path and the energy generating element being formed on a first surface of a substrate having the first surface and a second surface disposed oppositely relative to each other,
- the energy generating element being protected against liquid by an insulating layer formed on the first surface of the substrate,
- the liquid ejection head further comprising:
- a liquid inflow path running through the substrate and the insulating layer so as to allow liquid to flow into the flow path from the second surface side of the substrate;
- and
- a liquid outflow path running through the substrate and the insulating layer so as to allow liquid to flow out from the flow path to the second surface side of the substrate,
- the liquid inflow path and the liquid outflow path each respectively having a first opening formed on the first surface of the substrate after running through the substrate and a second opening formed on the insulating layer after running through the insulating layer,
- the ejection orifice being arranged between the liquid inflow path and the liquid outflow path, an ejection orifice side end of the second opening being located closer to the ejection orifice than an ejection orifice side end of the first opening for each of the liquid inflow path and the liquid outflow path,
- the relationships of L1≥L2 and L3≥L4 holding true, with the proviso that
- L3>L4 when L1=L2 and L1>L2 when L3=L4, where
- L1 is the distance from the center position of the ejection orifice to the ejection orifice side end of the first opening of the liquid inflow path;
- L2 is the distance from the center position of the ejection orifice to the ejection orifice side end of the first opening of the liquid outflow path;
- L3 is the distance from the center position of the ejection orifice to the ejection orifice side end of the second opening of the liquid inflow path;
- and
- L4 is the distance from the center position of the ejection orifice to the ejection orifice side end of the second opening of the liquid outflow path.
Dependencies are inferred from the claim text.