Optics: measuring and testing – Position or displacement – Position transverse to viewing axis
Reexamination Certificate
2008-08-22
2011-10-18
Nguyen, Sang (Department: 2886)
Optics: measuring and testing
Position or displacement
Position transverse to viewing axis
C356S601000, C356S243100, C356S243400
Reexamination Certificate
active
08040530
ABSTRACT:
Systems and methods for calibrating a solid-imaging system (10) are disclosed. A calibration plate (110) having a non-scattering surface (140) with a plurality (150) of light-scattering fiducial marks (156) in a periodic array is disposed in the solid-imaging system. The actinic laser beam (26) is scanned over the fiducial marks, and the scattered light (26S) is detected by a detector (130) residing above the calibration plate. A computer control system (30) is configured to control the steering of the light beam and to process the detector signals (SD) so as to measure actual center positions (xA, yA) of the fiducial marks and perform an interpolation that establishes a calibrated relationship between the angular positions of the mirrors and (x,y) locations at the build plane (23). The calibrated relationship is then used to steer the laser beam in forming a three-dimensional object (50).
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PCT Search Report for International Application No. PCT/US2008/074021.
3-D Systems, Inc.
Nguyen Sang
Roberson Keith A.
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