REGULATOR FOR PHOTOINTERRUPTER

摘要

PURPOSE:To obtain a regulator for detecting an object highly accurately while performing regulation efficiently and automatically, as required, without requiring any measuring instrument by varying the quantity of light to be emitted from a light emitting section thereby producing states where the object is present and not present artificially. CONSTITUTION:A photointerrupter 1 detects the presence of an object based on the variation of collector current of a transistor TrA at a light receiving section 1b when the object enters into or exits from a gap between a light emitting section 1a and the light receiving section 1b. A light emission varying means 2 connected between the and of a light emitting diode D and a power supply 7 controls current flowing through the light emitting diode D to produce states where the object is present and not present artificially. A comparing means 4 compares output from the light receiving section 1b for each state with a value set previously for each state depending on the reference value at the time of detection of the object through the photointerrupter 1. A control means 6 controls output from the light receiving section 1b variably to an optimal value based on the comparison results.