Process for construction of a feeding duct for an ink jet printhead
US7229157B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 24, 2002 |
| Grant date | Jun 12, 2007 |
| Priority date | — |
| Expiry date | Jan 20, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/1632
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
In an ink jet printhead, the ink feeding duct (2), passing through the thickness of the silicon substrate, and in hydraulic communication with the ejection cells (8) through an outlet area (2a) on the front surface (5) of the substrate (3), is built in three successive stages of erosion of the substrate (3), the first of which is performed on the rear surface (6) of the substrate, to produce a first cavity (24) having a depth (P1), and a further cavity (26) communicating and having a depth (P2), extending in the direction of the front surface (5), and presenting a back wall (28) separated from the front surface (5) by a diaphragm (30); the second stage is performed on the opposite front surface (5) to cut a channel (40) in the direction of the diaphragm (30), of depth (P4) and defining the contour of the outlet area (2a) on the front surface (5), and the third stage is performed from said rear surface (6) as a continuation of the erosion performed in the first stage, to remove the diaphragm (30) and open the duct (2) between the rear (6) and front (5) surfaces.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.