Led-based planar light illumination and imaging (PLIIM) systems
First Claim
1. A planar light illumination and imaging system for illuminating an object and forming an image thereof, said planar light illumination and imaging system comprising:
- an image formation and detection module having a field of view (FOV) focused at an image detecting array; and
a planar light illumination array (PLIA) constructed from a plurality of planar light illumination modules (PLIMs) arranged in rectilinear manner, wherein each said PLIM comprises a visible light emitting diode (LED), a focusing lens, and a cylindrical optical element arranged therewith to produce a planar light illumination beam component; and
wherein said individual planar light illumination beam components produced from said plurality of PLIMs are combined to produce a composite substantially planar light illumination beam having substantially-planar spatial distribution characteristics that extend through the field of view (FOV) of said image formation and detection module, so that light reflected off an object illuminated by said composite substantially planar light illumination beam is focused along said field of view and onto said image detecting array to form an image of said illuminated object.
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Abstract
A planar light illumination and imaging system for illuminating an object and forming an image thereof. The planar light illumination and imaging system which comprises an image formation and detection module having a field of view (FOV) focused at an image detecting array. A planar light illumination array (PLIA) constructed from an plurality of planar light illumination modules (PLIMs) is arranged in rectilinear manner. Each planar light illumination module comprises a visible light emitting diode (LED), a focusing lens, and a cylindrical optical element arranged therewith to produce a planar light illumination beam component; and wherein the individual planar light illumination beam components produced from the plurality of planar light illumination modules are optically combined to produce a composite substantially planar light illumination beam having substantially-planar spatial distribution characteristics that extend through the field of view (FOV) of the image formation and detection module, so that light reflected off an object illuminated by the planar light illumination beam is focused along the field of view and onto the image detecting array to form an image of the illuminated object.
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Citations
9 Claims
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1. A planar light illumination and imaging system for illuminating an object and forming an image thereof, said planar light illumination and imaging system comprising:
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an image formation and detection module having a field of view (FOV) focused at an image detecting array; and
a planar light illumination array (PLIA) constructed from a plurality of planar light illumination modules (PLIMs) arranged in rectilinear manner, wherein each said PLIM comprises a visible light emitting diode (LED), a focusing lens, and a cylindrical optical element arranged therewith to produce a planar light illumination beam component; and
wherein said individual planar light illumination beam components produced from said plurality of PLIMs are combined to produce a composite substantially planar light illumination beam having substantially-planar spatial distribution characteristics that extend through the field of view (FOV) of said image formation and detection module, so that light reflected off an object illuminated by said composite substantially planar light illumination beam is focused along said field of view and onto said image detecting array to form an image of said illuminated object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A planar light illumination and imaging (PLIIM) based system with automatic light beam power density compensation, said PLIIM based system comprising:
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an image formation and detection module having a field of view (FOV) focused at an image detecting array; and
a planar light illumination array (PLIA) having a plurality of planar light illumination modules, for producing a composite planar light illumination beam having substantially-planar spatial distribution characteristics that extend through the field of view (FOV) of said image formation and detection module, so that light reflected off an object illuminated by said composite planar light illumination beam is focused along said field of view and onto said image detecting array to form an image of said illuminated object;
wherein each said planar light illumination module comprises a visible light emitting diode (LED), a focusing lens, and a cylindrical optical element arranged therewith to produce a planar light illumination beam component of said composite planar light illumination beam; and
wherein said composite planar light illumination beam has a beam width which increases as a function of increasing object distance in said PLIIM based system; and
wherein the height of said composite planar light illumination beam decreases as the object distance increases, compensating for the increase in beam width in said composite planar light illumination beam which occurs for an increase in object distance, thereby yielding a light beam power density on the target object which increases as a function of increasing object distance over a substantial portion of the object distance range of said PLIIM bases system.
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Specification