Media weight sensor using a resonant piezoelectric element
US6467977B2 · kind B2 · utility
6Cited by
14References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2000 |
| Grant date | Oct 22, 2002 |
| Priority date | — |
| Expiry date | Mar 30, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01G3/13
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
This invention relates to a media weight sensor of the type that includes a transducer consisting of a metal disk with a piezoelectric element mounted in a printer so that the media going to the printer moves across the top of the resonator where an opening of the resonator is located. A soft, polymeric roller is used to press the media against the transducer. The resonant frequency of the resonator is affected by the media. The mass of the media adds to the mass of the resonator, thereby lowering the resonant frequency. Consequently, the heavier the media, the more the resonant frequency is lowered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.