Method and apparatus for spotter beam formation using a partitioned optical element

摘要: An optical element for causing a visible spotter beam emitted by hand-held scanning bar code reader provides indications of the area surface which is being scanned an invisible beam. The 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 presented. identifies making formed from angular form pattern indicating distance. made segmented gradient surfaces, such as Fresnel holographic element.