Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1988-12-09
1990-06-19
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250561, 356376, G01N 2186
Patent
active
049356356
ABSTRACT:
A three-dimensional measuring system particularly for dental and other space-limited uses has a laser diode projecting a triangulating beam at a surface to be mapped, with the beam scanned repeatedly across the surface. Photodetectors detect the position of the beam as reflected from the mapped surface, giving by triangulation Z-axis or depth information. Correlation of a particular point with the position of the scanner along the scan line gives Y-axis information, or information in a width direction. The scanner and diode are mounted on a slide or platform device which moves perpendicularly to the Y axis in the direction in and out of the mouth, driven by a stepper motor, and the monitored position of the stepper motor is coordinated with the other information on each spot to yield X-axis information.
REFERENCES:
patent: 4089608 (1978-05-01), Hoadley
patent: 4743771 (1988-05-01), Sacks et al.
patent: 4792698 (1988-12-01), Pryor
Frieburger Thomas M.
Nelms David C.
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