Patent ID: 7339309

Claim:
A crystal oscillator having a crystal blank, and an IC chip having integrated therein an oscillation circuit which uses said crystal blank, wherein: said crystal blank comprises a first excitation electrode disposed on a first principal surface of said crystal blank; and an extension electrode extended from said first excitation electrode to a peripheral region of said crystal blank, and folded back to a second principal surface of said crystal blank at a position in the peripheral region, said IC chip has a first and a second crystal connection terminal disposed on a first principal surface of said IC chip, said second crystal connection terminal extends to a central region on the first principal surface of said IC chip to constitute a second excitation electrode, said extension electrode is secured to said first crystal connection terminal for electrical and mechanical connection therebetween by a conductive material which is an inorganic material, such that the second principal surface of said crystal blank opposes the first principal surface of said IC chip, thereby holding said crystal blank in parallel with the first principal surface of said IC chip, and said first excitation electrode and said second excitation electrode oppose across said crystal blank.