Weight sensor with electrostatic capacitance

Details Weight sensor with electrostatic capacitance Weight sensor with electrostatic capacitance

1995-06-01

1997-09-30

Gellner, Michael L.

Weighing scales

Self-positioning

Electrical current generating or modifying

G01G 314

Patent

active

056728506

ABSTRACT:
An electrostatic capacitance type weight sensor includes a sheet-like upper support plate and a sheet-like lower support plate with their respective end portions secured together and having a pair of electrodes sandwiched therebetween. The upper support plate is coupled to a loaded element. Either sides of the upper and lower support plates adjacent their respective end portions are provided with bridge type elastic arms having a surface area smaller than that of a central portion of the upper support plate and the lower support plates. When the loaded element carries a load, causing one of the end portions of the upper support plate and the lower support plate to displace downwardly, the elastic arms flex in compensation so that the electrodes remain parallel to each other even when the space therebetween varies, thus enhancing measuring precision in addition to providing a thin and easily assembled weight sensor.

REFERENCES:
patent: 4366875 (1983-01-01), Dauge et al.
patent: 4846294 (1989-07-01), Sato
patent: 4856603 (1989-08-01), Murakoso et al.
patent: 4951764 (1990-08-01), Brand

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