| 摘要 |
PURPOSE:To attain size reduction without causing any mutual interference, etc., by storing detection coils in the same case, and making a shift in oscillation frequency between two oscillation circuits or operating them at different times on time-division basis. CONSTITUTION:In a figure, 2 and 3 are the detection coils, which are arranged at right angles to each other so that their detection directions are orthogonal and stored in the case 1. Further, a circuit constant is so selected that the oscillation frequency f1 of the 1st oscillation circuit 4 and the oscillation frequency f2 of the 2nd oscillation circuit 5 have an enough shift not to cause mutual interference. When the case 1 is arranged so that its lengthwise direction coincides with the lengthwise direction of a support part C and detection is carried out in two directions of metallic bodies on surfaces A and B of an L-shaped angle, the detection coils 2 and 3 detect approaches of the surfaces A and B, but when either surface reaches the detection area of a proximity switch, both oscillation circuits 4 and 5 oscillate and the oscillation frequencies are different at this time, so the oscillation circuits 4 and 5 never interfere with each other. |
