Patent ID: 7551040
Filing Date: 2009-06-23
Classification: H03B

Abstract:
1. A surface mount crystal oscillator, comprising: a package body having a first recess; a cover having a second recess; a crystal blank; and an IC chip having an oscillation circuit using said crystal blank integrated therein, and having IC terminals on one main surface thereof for use in connection to outside, wherein said IC chip is secured to an inner surface of said first recess, and a pair of crystal holding terminals are disposed on an inner surface of said second recess, said crystal blank comprises excitation electrodes formed on a pair of main surfaces, respectively, and a pair of lead-out electrodes extended respectively from said excitation electrodes to both ends of one side of said crystal blank, wherein both said ends of the one side are secured to said pair of crystal holding terminals, said package body has, on an open end surface of said first recess, a first annular metal film formed to surround said first recess, and a pair of first crystal connection terminals electrically connected to said IC terminals electrically independently of said first annular metal film, said cover has, on an open end surface of said second recess, a second annular metal film formed to surround said second recess, and a pair of second crystal connection terminal electrically connected to said crystal holding terminals electrically independently of said second annular metal film, said cover is bonded to said package body by bonding said first annular metal film and said second annular metal film with an eutectic alloy in a first eutectic alloy bond to integrate said first and second recesses and to hermetically seal said crystal blank and said IC chip in a space defined by said integrated first and second recesses, and said first crystal connection terminals and said second crystal connection terminals are bonded with an eutectic alloy in a second eutectic alloy bond to electrically connect said crystal blank to said IC chip, wherein the first eutectic alloy bond that bonds the first annular metal film and the second annular metal film is separated from the second eutectic alloy bond that bonds the first crystal connection terminals and the second crystal connection terminals.