Scanner optics, usable for example in a bar code reader, generate a multitude of Gaussian beams derived from a common light source to produce a beam with extended working range. In the preferred embodiment, a 360 degree fan of Gaussian beams is generated by passing a laser beam through at least one diffractive...http://www.google.fr/patents/US5315095?utm_source=gb-gplus-shareBrevet US5315095 - Beam with extended confinement for scanning purposes
Beam with extended confinement for scanning purposes
