Proximity Sensor System Test Arrangement
Original Publication Date: 1980-Feb-01
Included in the Prior Art Database: 2005-Feb-13
It has been previously proposed to provide multiple document detection in a document transport system by using an optical proximity detector system in which light from a light-emitting diode (LED) is reflected to a photodetector when documents are within a specified distance from the sensor unit. A thresholding circuit is set so that outputs of photodetector below a specified value will not cause an output signal from the system.