Weight sensor with electrostatic capacitance

A weight sensor with electrostatic capacitance, comprising:

• a baseplate;
• a fixed portion coupled and secured to said baseplate, said fixed portion having an upper portion and a lower portion;
• a movable portion having an upper portion and a lower portion;
• a loaded element coupled to and supported on said movable portion;
• a sheet-like upper support plate having two end portions respectively coupled to the upper portions of said fixed portion and said movable portion;
• a sheet-like lower support plate having two end portions respectively coupled to the lower portions of said fixed portion and said movable portion;
• a stationary electrode having one end thereof secured to said fixed portion;
• a movable electrode having one end thereof secured to said movable portion, said movable electrode being parallel to said stationary portion;
• said upper support plate and said lower support plate each having a central portion and bridge-like elastic arms extending from said central portion to their respective end portions, said elastic arms having a thickness the same as that of said central portion, and a surface area smaller than that of said central portion, so that when said loaded element carries a load, causing said movable portion to displace downwardly, said elastic arms perform compensational deformation to cause said movable electrode to displace such that its parallel relationship with the stationary electrode is maintained.