Ink droplet sensing means
US4323905A · kind A · utility
34Cited by
3References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 21, 1980 |
| Grant date | Apr 6, 1982 |
| Priority date | — |
| Expiry date | Nov 21, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/125
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An ink droplet sensing means for detecting whether or not droplets are impinging on record media during ink jet printing operations. A synthetic foil having a metal layer is placed over a counter electrode having a rough surface on one side and a voltage is then applied to the electrode and the metal layer. Ink droplets impinging on the foil momentarily deflect the foil and cause a change in capacity which in turn causes a voltage change at the electrode. The voltage change is coupled through a capacitor and an amplifier and through recognition logic for evaluation of the signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.