Sheet determination apparatus using ultrasonic wave transmitting unit or reception unit
US9874842B2 · kind B2 · utility
6Cited by
7References
24Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 1, 2014 |
| Grant date | Jan 23, 2018 |
| Priority date | — |
| Expiry date | Feb 9, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/00611
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A protection member is arranged such that the distance from an opening plane of a reception guide to the center of the protection member is half of the distance from the opening plane of the reception guide to the surface of a reception vibration member. In other words, the arrangement position of the protection member is in the center between the opening plane of the reception guide and the surface of the reception vibration member. Accordingly, even if a protection member is arranged, a transmission coefficient is obtained that is equal to a transmission coefficient in the case where no protection member is present.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.