Filter carrier for protecting a filter from being blocked by air bubbles in an inkjet printhead
US6457821B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 13, 2001 |
| Grant date | Oct 1, 2002 |
| Priority date | — |
| Expiry date | Mar 13, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2202/07
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The present invention overcomes the problem of filter blockage created by bubble accumulation underneath the filter of previous printheads with a filter carrier and filter that reduces air bubble blockage of the filter. Namely, air bubble blockage of the filter is avoided by trapping more bubbles in a designated area with a horizontal ink flow, relative to the substrate. In addition to the filter carrier and filter, the printing device further includes an outer housing, a substrate and an ink conduit. The substrate has a back surface and a front surface with ink ejection chambers formed thereon. The ink conduit has a distal end proximate to the back surface of the substrate. The ink conduit, the outer housing and the substrate define an ink flow path to the ink ejection chambers and a bubble accumulation chamber in communication with the ink flow path such that buoyancy will tend to move bubbles that accumulate in the ink flow path into the bubble accumulation chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.