Patent ID: 6087759
Filing Date: 2000-07-11
Classification: H03H,H05K,Y10T

Abstract:
A resonator for SMD mounting to a circuit board, the resonator comprising:a substantially plate-shaped bottom having a lower edge;a frame-shaped central portion disposed above said bottom;a crystal disposed within said frame-shaped central portion, said crystal mounted to said frame-shaped central portion for vibration;a plate-shaped lid disposed above said frame-shaped central portion;a first conducting surface at a first potential, said first conducting surface extending from said lower edge upwardly along an outer side of said bottom, said first conducting surface soldering said bottom to the circuit board;a second conducting surface at a second potential, said second conducting surface extending, in non-electrical contract with said first conducting surface, from said lower edge upwardly along an outer side of said bottom, said second conducting surface soldering said bottom to the circuit board;a first conducting layer disposed on a lower side of said frame-shaped central portion, said first conducting layer having a first area electrically connected to said first conducting surface and a second area electrically connected to said second conducting surface, said first conducting layer having a first interruption for electrically isolating said first area from said second area;a second conducting layer disposed at an upper side of said frame-shaped central portion, said second conducting layer having a third area electrically connected to said first conducting surface and a fourth area electrically connected to said second conducting surface, said second conducting layer having a second interruption for electrically isolating said third area from said fourth area;a first electrode disposed above said crystal for exciting said crystal, said first electrode electrically connected to said third area;a second electrode disposed below said crystal for exciting said crystal, said second electrode electrically connected to said second area; andmeans for sealing together said lid, said central portion, and said bottom into a sandwich-type housing having a sealed housing region containing said crystal, wherein said first and said second interruptions are disposed radially outside said sealed housing region.