Patent ID: 7872537

Claim:
A surface-mount crystal oscillator, comprising: a crystal blank; an IC chip in which at least an oscillation circuit using said crystal blank is integrated, a plurality of IC terminals are provided on one principal surface, and a plurality of mounting terminals for surface mounting are provided on the other principal surface; and a housing member joined to said one principal surface of said IC chip and formed into a recessed shape, wherein said plurality of IC terminals are constituted of a crystal connection terminal used for connection with said crystal blank, and IC external terminals including at least a power supply terminal, an output terminal and a ground terminal, said IC external terminals and said mounting terminals are electrically connected by a through-electrode provided to penetrate through said IC chip, said crystal blank is fixed to said crystal connection terminal, said crystal blank being held by said IC chip, and said crystal blank is hermetically encapsulated in a space formed by said IC chip and said housing member; wherein said mounting terminal for grounding is provided on a substantially entire surface of the other principal surface of said IC chip except area for the other mounting terminals.