Height measuring apparatus, health care device, and rotary gate

A health care device comprising:

• an electrostatic capacitance sensor that has a transmission electrode and a reception electrode, and measures a mutual capacitance between the transmission electrode and the reception electrode;
• a variable frequency pulse generator that generates a pulse supplied to the transmission electrode;
• a control apparatus that identifies a frequency at which the measured mutual capacitance becomes a minimum value by allowing the variable frequency pulse generator to sweep the frequency of the pulse and allowing the electrostatic capacitance sensor to measure the mutual capacitance, and obtains a height of a person to be measured on the basis of the identified frequency, wherein the control apparatus sets a frequency range within which the frequency of the pulse is to be swept, wherein the frequency range is set to be from a first frequency to a second frequency, wherein the first frequency corresponds to a length equal to or larger than a maximum height of a human body, and wherein the second frequency corresponds to a length equal to or smaller than a minimum height of the human body;
• and
• a pair of hand grips that can be gripped by the person to be measured,
• wherein the transmission electrode and the reception electrode are arranged at one of the pair of hand grips.

A rotary gate comprising:

• an electrostatic capacitance sensor that has a transmission electrode and a reception electrode, and measures a mutual capacitance between the transmission electrode and the reception electrode;
• a variable frequency pulse generator that generates a pulse supplied to the transmission electrode;
• a control apparatus that obtains the measured mutual capacitance by allowing the variable frequency pulse generator to sweep the frequency of the pulse and allowing the electrostatic capacitance sensor to measure the mutual capacitance, wherein the control apparatus sets a frequency range within which the frequency of the pulse is to be swept, wherein the frequency range is set to be from a first frequency to a second frequency, wherein the first frequency corresponds to a length equal to or larger than a maximum height of a human body, and wherein the second frequency corresponds to a length equal to or smaller than a minimum height of the human body;
• and
• a gate bar that is movable in a rotatable manner,
• wherein the transmission electrode and the reception electrode are provided at the gate bar, and
• wherein the control apparatus controls the rotation of the gate bar on the basis of the measured mutual capacitance.