The operating environment of a moving laser beam in a flying spot, electro-optical reader is simulated in a solid-state, sensor-based imaging reader by turning a visible line produced by a light emitting diode on and off prior to capturing a two-dimensional image of a target. The data is processed by the node or communicated to a child node for processing. Inner surfaces 9 of track 6 are formed to be inclined linearly becoming gradually wider downwards from their top while the upper ends of inner surfaces 9 are extended to an opposing area 2a located between the lower ends of paired parallel ribs 2. The intermediate portion includes a pair of side flanges on the base member between the bore and the opening and, optionally, a rib between the pair of side flanges. At least one of the transparent encapsulant layer and the backskin layer are predisposed to electron beam radiation.