| 摘要 |
A surface-mount casing for accommodating a quartz crystal blank to constitute a quartz crystal unit has a casing body, a pair of first connecting terminals disposed on respective paired diagonal corners of an inner bottom surface of the casing body, and a pair of second connecting terminals disposed on respective other paired diagonal corners of the inner bottom surface of the casing body. The second connecting terminals extend more closely to a center of the inner bottom surface than the first connecting terminals. The first connecting terminals are thicker than the second connecting terminals. A crystal blank having a pair of excitation electrodes and a pair of extension electrodes extending to outer peripheral portions from the excitation electrodes is held with the extension electrodes being electrically and mechanically connected to either the first connecting electrodes or the second connecting electrodes depending on the size of the crystal blank.
|
