Drop shock measurement system and acceleration sensor element used in the same

Abstract

The drop impact measuring system has i) a plurality of bimorph-type acceleration sensor containing a plurality of free vibrating sections each of which has individual draw-out electrodes; ii) a switch section for selecting output from the bimorph-type acceleration sensors; iii) an amplifying circuit for amplifying a signal applied via the switch section from the acceleration sensors; and iv) a logic circuit for logically evaluating the output from the amplifying circuit and controlling the switch section according to the result acquired from the logical evaluation.

1 . A drop impact measuring system comprising: 
 a) a plurality of bimorph-type acceleration sensors containing a plurality of free vibrating sections each of which has individual draw-out electrodes;    b) a switch section for selecting output of the plurality of bimorph acceleration sensors obtained through the draw-out electrodes;    c) an amplifying circuit for amplifying at least one of voltage and current applied via the switch section from the bimorph acceleration sensors; and    d) a logic circuit for logically evaluating the output from the amplifying circuit and controlling the switch section according to result acquired from the logical evaluation.    
     
     
         2 . A bimorph-type acceleration sensor element, which is used for a bimorph-type acceleration sensor, comprising i) a plurality of free vibrating sections having a cantilever beam structure; and ii) draw-out electrodes for drawing out a signal generated in the free vibrating sections.  
     
     
         3 . The bimorph-type acceleration sensor element of  claim 2 , wherein the plurality of the free vibrating sections are of different lengths and are electrically independent.  
     
     
         4 . The bimorph-type acceleration sensor element of  claim 2 , wherein the plurality of the free vibrating sections are of identical length and are electrically connected in parallel.  
     
     
         5 . A bimorph-type acceleration sensor element, which is used for a bimorph-type acceleration sensor, comprising i) a plurality of free vibrating sections having a both-ends-supported beam structure; and ii) draw-out electrodes for drawing out a signal generated in the free vibrating sections.  
     
     
         6 . The bimorph-type acceleration sensor element of  claim 5 , wherein the plurality of the free vibrating sections are of different lengths and are electrically independent.  
     
     
         7 . The bimorph-type acceleration sensor element of  claim 5 , wherein the plurality of the free vibrating sections are of identical length and are electrically connected in parallel.