Crystal unit
US7012355B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 2003 |
| Grant date | Mar 14, 2006 |
| Priority date | — |
| Expiry date | Jan 5, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/19
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A crystal unit has a crystal blank having a hole defined in at least one principal surface thereof, the crystal blank having a region of a reduced thickness including the hole, the region serving as a vibrating region, excitation electrodes disposed respectively on opposite principal surfaces of the crystal blank in the vibrating region, extension electrodes extending respectively from the excitation electrodes to respective opposite ends of one side of the crystal blank, and a casing having a step formed therein. The opposite ends of the one side of the crystal blank are fixed to the step by a joining member. The crystal blank has a notched portion defined therein between the one side and the vibrating region, the notched portion extending from at least one transverse edge of the crystal blank in a transverse direction of the crystal blank.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.