REFLECTED LIGHT SENSOR HAVING DUAL EMITTERS AND RECEIVERS

摘要

A reflected light sensor having a light transmitter including at least two mutually independent light sources and a light receiver including at least two separately evaluatable photosensitive elements. A switching point or distance limit of the light sensor can be continuously varied within a defined sensing range by inversely and continuously controlling currents of the light sources in accordance with a control voltage USt,LED, or by continuously varying a first and a second independent control voltage thereby controlling gains of signals at the output of the photosensitive elements.