Liquid ejection head, liquid ejection unit, and liquid ejection device
US9889654B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 2016 |
| Grant date | Feb 13, 2018 |
| Priority date | — |
| Expiry date | Mar 8, 2036 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2202/11
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A liquid ejection head includes structures arrayed in a predetermined direction, each structure including a nozzle to eject liquid, a pressure chamber in communication with the nozzle, and an ejection drive unit to increase pressure of the liquid in the pressure chamber. The ejection drive unit includes a diaphragm to form a wall of the pressure chamber, and an electromechanical transducer element including an electromechanical transducer film, the diaphragm being convex toward the pressure chamber. When an amount of curvature of the diaphragm for the pressure chamber is defined by a radius of curvature, a difference between minimum and maximum radii of curvature of the diaphragm for 20 channels of the pressure chambers is equal to or less than 1500 μm, the 20 channels being counted from one of the pressure chambers at each of end portions of the structures in the predetermined direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.