Liquid ejection head
AssigneeSeiko Epson Corporation
InventorJunhua CHANG
Life of this patent
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Abstract
In order to provide a liquid ejection head which enables ejection of a droplet at a higher frequency, according to the invention, a piezoelectric vibrator has a multilayer structure. In the multilayer structure, an upper piezoelectric layer and a lower piezoelectric layer are laminated one on another. A drive electrode is formed at a boundary between the upper piezoelectric layer and the lower piezoelectric layer and is electrically connected to a source for supplying a drive signal. An upper common electrode is formed on the surface of the upper piezoelectric layer. A lower common electrode is formed on the surface of the lower piezoelectric layer. An inertance of a nozzle orifice and an inertance of an ink supply port are set so as to become greater than an inertance of a pressure generating portion.
Claims10
A liquid ejection head, comprising:
- a liquid chamber, which stores liquid therein;
- a nozzle orifice, adapted to eject a liquid droplet therefrom;
- a pressure generating portion, provided in a liquid channel communicating with the liquid chamber and the nozzle orifice;
- and
- a liquid supply port, arranged between the liquid chamber and the pressure generating portion,
- wherein an inertance of the nozzle orifice Mn is greater than an inertance of the pressure generating portion Mc;
- and
- wherein the inertance of the nozzle orifice Mn and the inertance of the pressure generating portion Mc are expressed as the following equations:
- Mn=ρLn/Sn;
- and
- Mc=ρLc/Sc;
- where ρ denotes a density of liquid, Ln denotes a length of the nozzle orifice, Sn denotes a cross-section of the nozzle, Lc denotes a length of the pressure generating portion and Sc denotes the cross-section of the pressure generating portion.
A liquid ejection head, comprising:
- a liquid chamber, which stores liquid therein;
- a nozzle orifice, adapted to eject a liquid droplet therefrom;
- a pressure chamber, provided in a liquid channel communicating with the liquid chamber and the nozzle orifice;
- and
- a liquid supply port, arranged between the liquid chamber and the pressure chamber,
- wherein an inertance of the nozzle orifice Mn is greater than an inertance of the pressure chamber Mc, and
- wherein the inertance of the nozzle orifice Mn and the inertance of the pressure chamber Mc are expressed as the following equations:
- Mn=ρLn/Sn;
- and
- Mc=ρLc/Sc;
- where ρ denotes a density of liquid, Ln denotes a length of the nozzle orifice, Sn denotes a cross-section of the nozzle, Lc denotes a length of the pressure chamber and Sc denotes a cross-section of the pressure chamber.
Dependencies are inferred from the claim text.