Ink level sensor and related methods
US9599500B2 · kind B2 · utility
35Cited by
8References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 27, 2011 |
| Grant date | Mar 21, 2017 |
| Priority date | — |
| Expiry date | Sep 23, 2031 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2002/17579
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
In an embodiment, a method of sensing an ink level includes applying a pre-charge voltage Vp to a sense capacitor to charge the sense capacitor with a charge Q1, sharing Q1 between the sense capacitor and a reference capacitor, causing a reference voltage Vg at the gate of an evaluation transistor, and determining a resistance from drain to source of the evaluation transistor that results from Vg.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.