Symbology reader with converging cursor beams

摘要: An optical element causes emission of a visible spotter beam [emitted by]from hand-held scanning bar code reader. The provides indications the area surface which is being scanned by an invisible beam. transforms beam, at its extreme travel, into two pairs cursor beams are directed along predetermined trajectories relative to trajectory followed can be above and below, or left right center travel In one embodiment, method identifying proper focusing distance reader presented. identifies directing formed from angular extremes form pattern indicating distance. made segmented gradient surfaces, such as Fresnel holographic element.