The OPB710F series Reflective Object Sensor that consists of a gallium arsenide infrared emitting diode and an NPN silicon phototransistor. On each sensor, the emitting diode and detector are mounted side-by-side on parallel axes. A black plastic sleeve is attached and filled with encapsulating epoxy to cover the emitter and detector. The OPB710F ("F" versions) have a filtering material added to the epoxy to reduce the effect of ambient light. The package contains an internal barrier which prevents diode emissions from reaching the sensor directly.
Phototransistor output
Unfocused for sensing diffuse surface
Clear encapsulating epoxy
Filtered to reduce the effect of visible or fluorescent light
