| 摘要 |
A surface-mount quartz crystal unit has a planar substrate having a pair of crystal-connecting terminals on a first surface and mounting terminals on a second surface, a quartz crystal blank having a pair of extending electrodes which is formed on the outer peripheral portion of the crystal blank and is secured to the crystal-connecting terminals, respectively, with a conductive adhesive to hold the crystal blank on the planar substrate, a metal film formed along the outer periphery of the first surface, and a concave metal cover having an open end face. The crystal blank is hermetically encapsulated between the metal cover and planar substrate by bonding the open end face to the metal film. Preferably, the open end face is bonded to the metal film with a brazing material.
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