Crystal vibration element and crystal vibration device
US10298198B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 9, 2016 |
| Grant date | May 21, 2019 |
| Priority date | — |
| Expiry date | Jun 6, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B2200/0018
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A vibration element includes a crystal blank, a pair of excitation electrodes, and pair of extraction electrodes. The crystal blank is an AT cut crystal blank including a mesa part and an outer circumferential part which is thinner than the mesa part and surrounds the mesa part. The pair of excitation electrodes is provided on the two major surfaces of the mesa part. The pair of extraction electrodes include pad parts which are provided at the end parts of the crystal blank in the longitudinal direction on one major surface of the outer circumferential part and are connected to the pair of excitation electrodes. The length in the longitudinal direction of the crystal blank is less than 1000 μm. When the resonance frequency is F (MHz) and t=1670/F, the distance “y” (μm) between each of the pad parts and the mesa part satisfies 0.048F+1.18<y/t<0.097F+0.36.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.