Droplet deposition head
US10583651B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 2016 |
| Grant date | Mar 10, 2020 |
| Priority date | — |
| Expiry date | Dec 22, 2036 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2002/14225
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A droplet deposition head having a fluid chamber connected to a droplet ejection nozzle and to a reservoir for the fluid, and a piezoelectric actuator element formed at least in part by a fluid chamber wall having an electrode thereon, which element is displaceable in response to a drive voltage to generate a pressure in the chamber to eject a droplet of fluid from the chamber through the nozzle wherein the electrode is provided with a passivation coating which comprises, at least in part, a laminate comprising an inorganic insulating layer nearest to or contacting the electrode and an organic insulating layer overlying the inorganic insulating layer wherein defects in the insulating layers tend to be misaligned at the interface there between and wherein the inorganic insulating layer has thickness less than or equal to 500 nm and the organic insulating layer has a thickness less than 3 μm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.