Compact aiming light assembly and imaging module for, and method of, generating an aiming light spot with increased brightness and uniformity from a light-emitting diode over an extended working distance range in an imaging reader

摘要

An aiming light assembly generates an aiming light spot with increased brightness and uniformity over a range of working distances in which targets are electro-optically read by image capture. The assembly includes a light emitting diode (LED) for emitting an aiming light beam, a field stop through which the aiming light beam passes, an aiming lens for optically modifying the aiming light beam passing through the field stop to form the aiming light spot over the range of working distances, and a field lens located in the vicinity of the field stop and operative for imaging the LED downstream of the field stop and in the vicinity of a lens aperture of the aiming lens.

主权项

1. In a reader for electro-optically reading targets to be read by image capture over a range of working distances, an aiming light assembly for generating at least one aiming light spot with increased brightness and uniformity over the range of working distances, the aiming light assembly comprising:
a light emitting diode (LED) for emitting an aiming light beam; a field stop through which the aiming light beam passes, the field stop being in close confronting relationship with the LED; an aiming lens having a lens aperture and an optical axis, the aiming lens being spaced along the optical axis away from the field stop and being operative for optically modifying the aiming light beam passing through the field stop to form the at least one aiming light spot over the range of working distances; and a field lens located in the vicinity of the field stop and spaced along the optical axis away from the LED, and operative for imaging the LED downstream to the vicinity of the lens aperture of the aiming lens.