Optical: systems and elements – Lens – Plural focal length
Reexamination Certificate
2007-03-22
2009-12-01
Schwartz, Jordan M. (Department: 2873)
Optical: systems and elements
Lens
Plural focal length
C359S355000, C359S740000, C359S754000, C250S339050, C235S462010
Reexamination Certificate
active
07626769
ABSTRACT:
An imaging system (FIG.3) is disclosed that has a wavelength dependent focal shift caused by longitudinal chromatic aberration in a lens assembly (203) that provides extended depth of field imaging due to focal shift (213,214) and increased resolution due to reduced lens system magnification. In use, multiple wavelengths of quasi-monochromatic illumination, from different wavelength LEDs (206,207) or the like, illuminate the target, either sequentially, or in parallel in conjunction with an imager (200) with wavelength selective (colored) filters. Images are captured with different wavelengths of illumination that have different focus positions (208,209), either sequentially or by processing the color planes of a color imager separately. Extended depth of field, plus high resolution are achieved. Additionally, information about the range to the target can be determined by analyzing the degree of focus of the various colored images.
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Olmstead Bryan L.
Shearin Alan
Datalogic Scanning, Inc.
Schwartz Jordan M.
Stoel Rives LLP
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