Products in the logic output reflective optical sensor family incorporate an optical emitter and light sensitive element (typically a phototransistor) mounted adjacent to each other and facing the same direction, such that light from the emitter that is reflected by an object in the sensor's field of view can be detected by the sensing element within the device. Logic output sensors of this type produce a binary (two-state) signal on the basis of whether or not the optical signal received by the photosensor exceeds some specified threshold value.