Ink level sensing
US10082414B2 · kind B2 · utility
3Cited by
41References
16Claims
0Family size
Assignee
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Key dates
| Filing date | Feb 2, 2017 |
| Grant date | Sep 25, 2018 |
| Priority date | — |
| Expiry date | Apr 22, 2037 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2002/17579
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
In some examples, an ink level sensor includes a sense capacitor between a first node and ground, a first switch to couple a first voltage to the first node and charge the sense capacitor, a second switch to couple the first node with a second node and share the charge between the sense capacitor and a reference capacitor, causing a second voltage at the second node, and a transistor having a drain, a gate coupled to the second node, and a source coupled to ground, the transistor to provide a drain to source resistance in proportion to the second voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.