Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1998-02-05
2000-02-29
Lee, John R.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250234, 25055934, 2505594, 25055906, 356376, 359202, G02B 2610, G01B 1100, G01N 2100
Patent
active
060312254
ABSTRACT:
A system and method for correcting a scan pattern of a moving optical scanning system. A gantry moves an optical system at a constant rate in a first direction. Using a light source and a first deflector, the optical scanning system quickly sweeps a light beam in a direction orthogonal to the motion of the gantry by changing the angle of deflection of the first deflector linearly with time. To compensate for the motion of the gantry, the optical system includes a second deflector which deflects the light, the deflection angle being determined as a function of the velocity of the gantry. The deflected light is focussed on the object (or pattern). Accordingly, the object is scanned along a corrected scan line orthogonal to the X-axis. The optical scanning system may optionally perform "selected" scanning. Also, the optical system optionally employs a "look-ahead/look-behind" scanning approach to further improve the rate at which portions of an object (or pattern) may be inspected.
REFERENCES:
patent: 4788423 (1988-11-01), Cline
patent: 4957369 (1990-09-01), Antonsson
patent: 5463227 (1995-10-01), Stern et al.
patent: 5663825 (1997-09-01), Amon et al.
patent: 5712678 (1998-01-01), Hofmann
Blosser Robert C.
Liu Kuo-Ching
Stern Howard
Lee John R.
Robotic Vision Systems Inc.
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