| 摘要 |
PROBLEM TO BE SOLVED: To reduce the restrictions of a use place by freely setting a communication frequency to a frequency different from noise. SOLUTION: A setting display means 9 is provided on the top surface of a scanner body 10. In the front of the scanner body 20, a transmission frequency setting operation part 5a and a reception frequency setting operation part 5b are provided rotatably as a dial type operation part 5. When one scale is selected by rotating the transmission frequency setting operation part 5, the coil and capacitor of a transmission part vary in inductance and capacitance and the resonance frequency varies to the transmission frequency corresponding to the selected scale, thereby setting the transmission frequency. When one scale is selected by rotating the reception frequency setting operation part 5b, the coil and capacitor of a reception part vary in inductance and capacitance and the resonance frequency varies to the reception frequency corresponding to the scale, so that the reception frequency is set. |
