BODY FAT QUANTITY GAUGE AND WEIGHING SCALE HAVING BODY FAT QUANTITY GAUGE

摘要

PROBLEM TO BE SOLVED: To accurately estimate a body fat quantity even when contact impedance between a living body and living body impedance measuring electrodes becomes large when wearing socks by deciding impedance between both feet from a measured internal inflow current and an electric potential difference between voltage measuring terminals. SOLUTION: A both feet living body impedance measuring device composed of a pair of electrodes A (A1 and A2) in contact with tiptoe parts of both feet and a pair of electrodes B (B1 and B2) to measure an electric potential difference between heels by making contact with heel parts of both feet, is arranged on a placing stand of an electronic weighing scale. An input device to input physical characteristics such as stature, age and the distinction of sex is provided. An output of a sine wave oscillator is connected to the electrodes A through a resistance R1, and a living body inflow current is found from an electric potential difference equivalent to a voltage drop in the resistance R1. On the other hand, an electric potential difference equivalent to a voltage drop from the electrodes B is found by a differential amplifier, and is sent to a control device after waveform reshaping, DC conversion and AD conversion, and a body fat quantity is calculated from the physical characteristics and measured body weight, and is displayed on a display.