| 摘要 |
PURPOSE:To determine the distance to the target accurately by applying output of a differential contactless switch in parallel to plural comparators having successively different comparison voltage and detecting output of the comparators. CONSTITUTION:Output of an oscillating circuit 5 is given to a target 1 from a coil 4, and a signal corresponding to the target 1 is obtained from a sense coil 2. Difference between output of a reference coil 3 and that of the sense coil 2 is detected by an amplifier 6, and detected output is detected and integrated by a circuit 7. Output of the circuit 7 is applied in parallel to comparators Q1-Q12. Comparison voltage obtained by dividing a power source VCC by resistances R1-R12 is applied to comparators Q1-Q12. Accordingly, the distance of the target 1 can be determined by detecting output O1-O12 of comparators Q1- Q12. |
