| 摘要 |
<p>PURPOSE:To detect an electrostatic capacity without receiving any influence from a stray capacity produced between electric wires or between earths by shielding a detection electrode with electrodes for earth. CONSTITUTION:When a weight G is applied to a weight detecting member 10, distances d1 and d2 between a detection electrode 10a and electrodes for earth 10d and 10e become shorter, since urethane members 10b and 10c are compressed. As a result, the time constant of a detecting member 10 changes and a capacity detecting section 3 detects the change and outputs an electrostatic capacity detecting signal to a heater controlling section 4. Therefore, only the change in the electrostatic capacity produced by the weight G can be detected without receiving any external influence, since the detection electrode 10a is shielded by the electrodes 10d and 10e.</p> |
