| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a safety device which can positively detect foreign matter inclusive of a contact position and a contact state of the same. <P>SOLUTION: The safety device has an electrode, a first sensor circuit section, a second sensor circuit section, and a control section. The electrode changes its characteristics upon contact with foreign matter. The first sensor circuit section supplies a signal of a predetermined voltage to one end of the electrode, and detects a voltage value of a signal generated at the one end. The second sensor circuit section supplies a signal of a predetermined voltage to the other end of the electrode, and detects a voltage value of a signal generated at the other end. When the signal of the predetermined voltage is supplied to the electrode from the first sensor circuit section, if the voltage value detected by the first sensor circuit section falls in a predetermined range, the control section determines that contact with foreign matter has occurred. Further, when the signal of the predetermined voltage is supplied to the electrode from the second sensor circuit section, if the voltage value detected by the second sensor circuit section falls in a predetermined range, the control section determines that contact with foreign matter has occurred. The control section compares the voltage value detected by the first sensor circuit section with the voltage value detected by the second sensor circuit section, and detects a contact position. <P>COPYRIGHT: (C)2008,JPO&INPIT |
