Liquid surface sensor and liquid surface detection method
US10656003B2 · kind B2 · utility
1Cited by
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3Claims
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Key dates
| Filing date | Nov 29, 2018 |
| Grant date | May 19, 2020 |
| Priority date | — |
| Expiry date | Nov 29, 2038 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2002/17583
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A liquid surface sensor includes a hollow member having a first opening end and a second opening end, and a sensor unit provided so as to close the first opening end of the hollow member. The sensor unit includes a vibration plate, and a piezoelectric element which is provided on the vibration plate and is formed by laminating a first electrode film, a piezoelectric film, and a second electrode film in a thickness direction of the vibration plate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.