METHOD OF AND SYSTEM FOR PRODUCING DIGITAL IMAGES

专利名称：METHOD OF AND SYSTEM FOR PRODUCING

DIGITAL IMAGES OF OBJECTS WITHSUBTANTIALLY REDUCED SPECKLE-NOISEPATTERNS BY ILLUMINATING SAID OBJECTSWITH SPATIALLY AND/OR TEMPORALLYCOHERENT-REDUCED PLANAR LASERILLUMINATION

发明人：Constantine J. Tsikos,Allan Wirth,Andrew

Jankevics,Steve Y. Kim,TimothyGood,Thomas Amundsen,Charles A.Naylor,Russell Joseph Dobbs,XiaoxunZhu,Michael D. Schnee,Carl Harry Knowles

申请号：US09883130申请日：20010615公开号：US06830189B2公开日：20041214

专利附图：

摘要：Methods of and systems for illuminating objects using planar laser illuminationbeams having substantially-planar spatial distribution characteristics that extend throughthe field of view (FOV) of image formation and detection modules employed in suchsystems. Each planar laser illumination beam is produced from a planar laser illuminationbeam array (PLIA) comprising an plurality of planar laser illumination modules (PLIMs).Each PLIM comprises a visible laser diode (VLD, a focusing lens, and a cylindrical opticalelement arranged therewith. The individual planar laser illumination beam componentsproduced from each PLIM are optically combined to produce a composite substantiallyplanar laser illumination beam having substantially uniform power density characteristicsover the entire spatial extend thereof and thus the working range of the system.Preferably, each planar laser illumination beam component is focused so that theminimum beam width thereof occurs at a point or plane which is the farthest or maximumobject distance at which the system is designed to acquire images, thereby compensatingfor decreases in the power density of the incident planar laser illumination beam due tothe fact that the width of the planar laser illumination beam increases in length for

increasing object distances away from the imaging optics. Advanced high-resolutionwavefront control methods and devices are disclosed for use with the PLIIM-basedsystems in order to reduce the power of speckle-noise patterns observed at the imagedetections thereof. By virtue of the present invention, it is now possible to use both VLDsand high-speed CCD-type image detectors in conveyor, hand-held and hold-under typeimaging applications alike, enjoying the advantages and benefits that each suchtechnology has to offer, while avoiding the shortcomings and drawbacks hithertoassociated therewith.

申请人：METROLOGIC INSTRUMENTS, INC.

代理人：Thomas J. Perkowski, Esq., P.C.

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