Reflective Object Sensor
Original Publication Date: 1982-Oct-01
Included in the Prior Art Database: 2005-Feb-10
In the sensing of the presence or absence of an object such as a sheet of paper, it is not always possible to control the Position of the object with respect to the light source and photosensor of the detection apparatus and, with light sources and photodetectors oriented at an angle with respect to each other, the converging paths of the illumination and the detection zone must intersect at approximately the plane in which the object is expected to be detected. If the object is substantially displaced from the plane of detection, then the light provided by the illumination source will not be reflected by the object into the photosensor and, therefore, an erroneous signal will result.