Optics: measuring and testing – Refraction testing – Prism engaging specimen
Patent
1975-12-15
1977-03-15
Corbin, John K.
Optics: measuring and testing
Refraction testing
Prism engaging specimen
250203R, 356247, G01B 1126, G02B 2734
Patent
active
040121488
ABSTRACT:
A system for providing exact centering of an art work target at a given point to thereby provide exact positioning of a printed circuit board to be drilled, by way of example, combines visual as well as automatic electronic means for effecting the centering. The art work target in the form of an annular opaque pad with a clear center is projected onto a rear projection screen on which there are provided X and Y orthogonal axes the intersection point of which defines the exact point for centering of the art work target. Elongated photo cells are positioned quadrilaterally about the intersection point on the orthogonal axes, part of each of the photo cells lying in the opaque area of the target and the remaining portions lying in the clear center portion of the target. Shadows cast by these photo cells are visible on the rear projection screen so that a viewer can observe precisely what the photo cells "see." When the target image is precisely centered at the intersection point of the orthogonal axes, all of the signals from the photo cells will be equal. By utilizing difference signals between opposite photo cells aligned with X axis to drive an X servo motor and difference signals between the photo cells aligned on the Y axis to drive a Y servo motor, a table supporting the art work can be automatically moved in the X and Y directions to effect the desired precise centering automatically.
REFERENCES:
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patent: 2737080 (1956-03-01), Mottu
patent: 3293439 (1966-12-01), Marantette et al.
patent: 3486024 (1969-12-01), Astheimer
patent: 3739247 (1973-06-01), Yamaguchi et al.
Birbeck et al. "A Gallium Arsenide Laser Rangefinder used as an Aircraft Altimeter," Jr. Sci. Instruments, 1965, pp. 541-542.
Marantette Ruth B.
Marantette William F.
Corbin John K.
Pastoriza Ralph B.
Punter Wm. H.
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