Apparatus for and method of imaging targets with a hybrid imaging lens assembly

Abstract

An imaging lens assembly captures return light from a target, and projects the captured light onto a solid-state imager during electro-optical reading of the target. One plastic lens and one glass lens, together having a relatively low negative optical power, are situated at one side of an aperture stop. Another plastic lens and another glass lens, together having a relatively high positive optical power, are situated at the opposite side of the aperture stop. An aperture extends along an optical axis through the opposite sides. Each plastic lens is configured with opposite aspheric nearly concentric surfaces to widen and flatten the field of view of the imager, and to reduce sensitivity to manufacturing and assembly tolerances. A holder holds the lenses and the aperture stop in spaced relation along the optical axis relative to the imager.