Thermal ink jet printer utilizing a printhead resistor having a central cold spot
US4514741A · kind A · utility
44Cited by
1References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 22, 1982 |
| Grant date | Apr 30, 1985 |
| Priority date | — |
| Expiry date | Nov 22, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2202/11
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A thermal ink jet printer utilizes a printhead resistor which has a central conductive region to excite bubble growth and to cause ejection of ink droplets. The existence of the central conductive region causes bubbles to be created which are toroidal in shape and which fragment during collapse, thereby randomly distributing the resultant acoustic shock across the surface of the printhead resistor and minimizing cavitation damage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.