A multiple depth of field optical scanner which produces a plurality of scan beams having different focal distances. The optical scanner includes a laser beam having a centerline, a mirrored spinner having a plurality of facets with different curvatures, a detector, and a microcontroller. The optical...http://www.google.de/patents/US5484990?utm_source=gb-gplus-sharePatent US5484990 - Multiple depth of field laser optical scanner
