公开(公告)号：US20140338469A1

公开(公告)日：2014-11-20

申请号：US14450293

申请日：2014-08-04

Applicant: Panasonic Corporation

Inventor： KOUMEI FUJITA

IPC: G01L1/10

CPC classification number: G01L1/10 ,  G01H1/003 ,  G01L1/106 ,  G01L5/00

Abstract: A load sensor includes a vibrator, a drive electrode provided at the vibrator, a drive circuit that supplies, to the drive electrode, a drive voltage for vibrating the vibrator, a detection electrode that outputs a current in response to a vibration of the vibrator, and an IV converter that converts the current output from the detection electrode into a voltage. The drive circuit includes an operational amplifier that outputs the drive voltage and a resistor connected to the operational amplifier. The drive circuit has a small internal resistance. The IV converter has an inverted input terminal that is virtually grounded and that has the current input thereto. The IV converter may constitute a negative feedback circuit.

Abstract translation: 负载传感器包括振动器，设置在振动器处的驱动电极，向驱动电极提供用于使振动器振动的驱动电压的驱动电路，响应于振动器的振动而输出电流的检测电极， 以及将检测电极的电流输出转换为电压的IV转换器。 驱动电路包括输出驱动电压的运算放大器和连接到运算放大器的电阻。 驱动电路内阻小。 IV转换器具有实际上接地并具有电流输入的反相输入端子。 IV转换器可以构成负反馈电路。