Detector for magnetism using a resistance element

A magnetism detector comprising:

• (1) first detector means comprising:
• a single crystal substrate having a resistance element which has a piezo resistance effect such that electric resistance varies due to mechanical deformation,
• a strain generative body having a supporting portion and a working portion, said working portion being displaceable with respect to said supporting portion so as to produce a mechanical deformation of said strain supporting portion, and
• a magnetic body connected to said working portion so as to allow said working portion to undergo a displacement in response to a magnetic force to which said magnetic body is exposed,
• said substrate being mechanically connected to said supporting portion so that a mechanical deformation of said supporting portion is transmitted to said substrate,
• (2) second detector means comprising:
• a single crystal substrate having a resistance element which has a piezo resistance effect such that electric resistance varies due to mechanical deformation,
• a strain generative body having a supporting portion and a working portion, said working portion being displaceable with respect to said supporting portion so as to produce a mechanical deformation of said supporting portion, and
• a weight body connected to said working portion so as to allow said working portion to undergo a displacement corresponding to an applied acceleration, and being made of a material of different magnetic properties from that of said magnetic body,
• said substrate being mechanically connected to said supporting portion so that a mechanical deformation of said supporting portion is transmitted to said substrate, and
• (3) compensation computation means for inputting a change in a resistance value of said resistance element of said first detector means and a change in a resistance value of said resistance element of said second detector means as first and second data, respectively, to cancel influence of an acceleration of said magnetic body on the basis of said both data, thus to calculate only a magnetic force acting on said magnetic body.

A magnetism detector comprising:

• (1) first detector means comprising:
• a single crystal substrate having a resistance element which has a piezo resistance effect such that electric resistance varies due to mechanical deformation, said substrate having a supporting portion and a working portion, said working portion being displaceable with respect to said supporting portion so as to produce a mechanical deformation of said substrate, and
• a magnetic body connected to said working portion so as to allow said working portion to undergo a displacement in response to a magnetic force to which said magnetic body is exposed,
• (2) second detector means comprising:
• a single crystal substrate having a resistance element which has a piezo resistance effect such that electric resistance varies due to mechanical deformation, said substrate having a supporting portion and a working portion, said working portion being displaceable with respect to said supporting portion so as to produce a mechanical deformation of said substrate, and
• a weight body connected to said working portion so as to allow said working portion to undergo a displacement corresponding to an applied acceleration, and being made of a material of different magnetic properties from that of said magnetic body, and
• (3) compensation computation means for inputting a change in a resistance value of said resistance element of said first detector means and a change in a resistance value of said resistance element of said second detector means as first and second data, respectively, to cancel influence of an acceleration of said magnetic body on the basis of said both data, thus to calculate only a magnetic force acting on said magnetic body.