Complex resonance circuit and oscillation circuit using the same

Abstract

A piezoelectric vibration device includes a single piezoelectric substrate, at least three electrode pairs formed on the single piezoelectric substrate, and two external connection terminal pairs, wherein the three electrode pairs are connected to the two external connection terminal pairs so that two different vibration modes individually appear at the two external connection terminal pairs.

1 . A piezoelectric vibration device comprising:
 a single piezoelectric substrate;   at least three electrode pairs formed on said single piezoelectric substrate; and   two external connection terminal pairs,   wherein   said three electrode pairs are connected to said two external connection terminal pairs so that two different vibration modes individually appear at said two external connection terminal pairs.   
     
     
         2 . A piezoelectric vibration device comprising:
 a single piezoelectric substrate;   at least four electrode pairs formed on said single piezoelectric substrate; and   two external connection terminal pairs,   wherein   said four electrode pairs are connected to said two external connection terminal pairs so that only two different vibration modes individually appear at said two external connection terminal pairs and a vibration mode excluding said two different vibration modes dose not appear at said two external connection terminal pairs.   
     
     
         3 . A piezoelectric vibration device according to  claim 1 ,
 wherein   said electrode pairs are rear and front surface electrode pairs, both rear and front surface electrodes are opposite to each other so as to sandwich said substrate.   
     
     
         4 . A piezoelectric vibration device according to  claim 3 , further comprising two negative and positive external electrode pairs,
 wherein   one of said rear and front surface electrode pairs is connected to one of said two negative and positive external electrode pairs, and   two of said rear and front surface electrode pairs respectively having opposite polarities are connected to the other of said two negative and positive external electrode pairs.   
     
     
         5 . A piezoelectric vibration device according to  claim 1 ,
 wherein   each of said electrode pairs is formed substantially in parallel on the same principal surface of said substrate.   
     
     
         6 . A piezoelectric vibration device according to  claim 1 ,
 wherein   each of said electrode pairs is configured by at least one interleaved electrode pair.