Patent ID: 7538627

Claim:
A surface-mount crystal oscillator, comprising: a package body having a recess and formed with a step on an inner wall of the recess; a flat base plate having a peripheral region secured to the step; a crystal blank secured to said flat base plate; an IC chip having an oscillation circuit integrated therein, and secured to a bottom surface of the recess, said oscillation circuit using said crystal blank; a cover for closing the recess,wherein said crystal blank is disposed above said IC chip within the recess, and said IC chip and said crystal blank are hermetically sealed within the recess; a pair of excitation electrodes disposed respectively on both main surfaces of said crystal blank; and a pair of lead-out electrodes extended respectively from said excitation electrodes to both ends of one side of said crystal blank, wherein said crystal blank is secured to said flat base plate along a peripheral region thereof to which said lead-out electrodes are extended and wherein said flat base plate includes an opening formed through a central region thereof to expose one of said excitation electrodes, and said crystal blank is disposed between said flat base plate and said IC chip in the recess.