Load sensor and load detector

A load sensor comprising:

• two vibrating units each having a magnetostrictive element or a piezoelectric element capable of resonating;
• two pick-ups that generate induced currents or induced voltages using inverse magnetostrictive effects of the magnetostrictive elements or piezoelectric effects of the piezoelectric elements resulting from vibrations of the vibrating units;
• and
• a substance adsorbent provided at one of the vibrating units,
• wherein at least one of the vibrating units is formed by bonding the magnetostrictive element and a soft magnetic body to each other, the magnetostrictive element is composed of an Fe—Co based alloy having a plate-like shape, the soft magnetic body is composed of an alloy based on Ni and 0 to 20% by mass of Fe or an Ni—Co based alloy having a plate-like shape, and the at least one of the vibrating units has a configuration composed of a clad plate with the magnetostrictive element.

A load detector comprising:

• a load sensor that includes:
• a vibrating unit having a magnetostrictive element or a piezoelectric element capable of resonating;
• a pick-up that generates an induced current or an induced voltage using inverse magnetostrictive effect of the magnetostrictive element or piezoelectric effect of the piezoelectric element resulting from vibration of the vibrating unit;
• and
• a substance adsorbent provided at the vibrating unit, and
• a radio information transmitter that transmits a signal by radio about a resonance frequency of the vibrating unit using the induced current or the induced voltage at the pick-up,
• wherein the radio information transmitter includes:
• a rectifier circuit that converts an alternating-current voltage resulting from induced electromotive force in the pick-up to a direct-current voltage;
• a capacitor that stores electric charge output from the rectifier circuit;
• and
• a radio information transmission circuit, if electrostatic energy stored in the capacitor is equal to or higher than energy required for making one radio information transmission, the radio information transmission circuit making radio transmissions using the electrostatic energy.