Physical quantity sensor device

Abstract

A circuit board is mounted on a package via an adhesive agent as an elastic member. A sensor element is stacked in fixed relation onto the circuit board. The sensor element, the circuit board, and the package are wired with bonding wires. A magnetic member made of a ferromagnetic material is disposed between the adhesive agent and the circuit board.

1 . A physical quantity sensor device comprising: 
 a sensor element for sensing a physical quantity;    a package to which the sensor element is mounted;    an elastic member having elasticity, disposed between the sensor element and the package for holing the sensor element to the package, the elastic member facing (i) a first space including the sensor element and (ii) a second space opposing the first space; and    a magnetic member, which is made of a ferromagnetic material and included in the first space.    
   
   
       2 . The physical quantity sensor device of  claim 1 , wherein 
 the magnetic member is disposed between the elastic member and the sensor element.    
   
   
       3 . The physical quantity sensor device of  claim 2 , further comprising: 
 a circuit board mounted to the package via the elastic member, wherein    the sensor element is stacked in fixed relation to the circuit board, and    the magnetic member is disposed between the elastic member and the circuit board.    
   
   
       4 . The physical quantity sensor device of  claim 2 , further comprising: 
 a circuit board fixed to the package, wherein    the sensor element is stacked to the circuit board via the elastic member, and    the magnetic member is disposed between the elastic member and the sensor element.    
   
   
       5 . The physical quantity sensor device of  claim 1 , further comprising: 
 a second magnetic member, which is made of a ferromagnetic material and included in the second space with respect to the elastic member, wherein    the magnetic member included in the first space with respect to the elastic member is referred to as a first magnetic member,    the first magnetic member and the second magnetic member oppose each other, and    the elastic member is disposed between the first magnetic member and the second magnetic member.    
   
   
       6 . The physical quantity sensor device of  claim 5 , further comprising: 
 a protruding portion provided to at least one of opposing portions of the first magnetic member and the second magnetic member for allowing the elastic member to retain a thickness between the first magnetic member and second magnetic member.    
   
   
       7 . The physical quantity sensor device of  claim 5 , further comprising: 
 a protruding portion provided to an end portion of the first magnetic member to oppose the package, for allowing the elastic member to retain a thickness between the first magnetic member and second magnetic member.    
   
   
       8 . The physical quantity sensor device of  claim 5 , further comprising: 
 a protruding portion provided to the first magnetic member to oppose the package without being intervened by the second magnetic member, for allowing the elastic member to retain a thickness between the first magnetic member and second magnetic member.    
   
   
       9 . The physical quantity sensor device of  claim 1 , wherein 
 the elastic member includes an adhesive agent made of a resin.