Imaging module and reader for, and method of, reading a target over a field of view by image capture with a visually prominent indicator of a center zone of the field of view

摘要

An imaging sensor of an imaging reader senses return light from a target to be read by image capture along an imaging axis over a field of view that extends along mutually orthogonal, horizontal and vertical axes. Two aiming light assemblies are offset from the sensor, and direct an aiming light pattern at the target. The pattern has an aiming mark in a central area of the pattern, and a pair of aiming light lines that are collinear along the horizontal axis. The visibility of the aiming mark is enhanced by optically configuring the aiming mark to be different in brightness relative to a remaining area of the pattern by specially configuring aiming lenses with regions of different optical power to forte each aiming light line of non-uniform brightness. The aiming mark of enhanced visibility constitutes a prominent visual indicator of a center zone of the field of view.

主权项

1. An imaging module for reading a target by image capture over a range of working distances away from the module, comprising:
an imaging system including an imaging sensor for sensing light returning from the target along an imaging axis over a field of view that extends along mutually orthogonal, horizontal and vertical axes that are generally perpendicular to the imaging axis; and an aiming light system offset from the imaging system and operative for directing an aiming light pattern at the target, for optically forming the aiming light pattern with an aiming mark in a central area of the aiming light pattern and with a pair of aiming light lines that are collinear along the horizontal axis, and for optically enhancing the visibility of the aiming mark relative to a remaining area of the aiming light pattern by optically configuring the aiming light lines to be of non-uniform brightness, the aiming mark of enhanced visibility constituting a prominent visual indicator of a center zone of the field of view in which the target is positioned over the range of working distances.