Bubble jet print head having improved resistive heater and electrode construction
US4947189A · kind A · utility
8Cited by
11References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 12, 1989 |
| Grant date | Aug 7, 1990 |
| Priority date | — |
| Expiry date | May 12, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/14129
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An improved heater/electrode construction for a bubble jet print head of the kind having discrete ink heater elements formed of electrically resistive material and a plurality of address electrode pairs formed of electrically conductive material and electrically contacting opposing edge regions of respective heater elements. The heater element resistance increases from its center outward and the electrode ends are spaced from the bubble formation region to provide, in a drop ejection condition, a flat slope temperature profile along the current flow path through the bubble formation zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.