Droplet deposition apparatus

Abstract

Droplet deposition apparatus comprising: an array of fluid chambers, each fluid chamber defined by a pair of opposing chamber walls comprising piezoelectric material separated one from the other by a chamber wall separation, and in fluid communication with a nozzle for droplet ejection therefrom; and a cover member joined to the edges of said chamber walls, thereby sealing one side of said chambers; wherein the thickness of the cover member is less than 150 µm.

Description

Technical field [0001] The present invention relates to a component for a droplet deposition device, and more particularly to a cover for a droplet deposition device. The invention is particularly suitable for the field of on-demand inkjet printing. Background technique [0002] One known inkjet print head configuration uses piezoelectric actuation elements to generate and manipulate pressure waves in a fluid ejection chamber. In order to operate reliably and maintain a sufficient droplet ejection velocity, a minimum pressure must be generated in the chamber, usually about 1 bar. It should be understood that in order to generate such pressure, the chamber must exhibit proper stiffness (or lack of compliance). Therefore, the compliance of the fluid chamber is an important criterion for chamber design, and a large number of technical solutions have been proposed to keep the compliance of the fluid ejection chamber to a minimum. [0003] For example, EP 0712355 describes a bonding ...

AI Technical Summary

Problems solved by technology

In this arrangement, the displacement is typically around 50 nm, and it is understood that a corresponding change in channel dimension due to channel compliance will result in a rapid loss of pressurization with a corresponding drop in performance

Images