Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1984-05-03
1986-03-18
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250234, G01N 2186
Patent
active
045771138
ABSTRACT:
The system effects positioning of an art work at precise given X and Y rectangular coordinate points. This art work may correspond to drill hole positions in a printed circuit board. By recording in memory the exact rectangular coordinate points on the art work and the necessary servo signals to effect exact centering at the coordinate points, accurate circuit board drilling can be carried out. A circular hole is provided in the art work and an image of this hole projected to a screen having horizontal and vertical cross hairs defining X and Y axes respectively. The art work is precisely positioned at a given pair of rectangular coordinates when the intersection of the cross hairs corresponds exactly with the exact center of the image of the circular hole. Exact centering is achieved by causing first and second light responsive photo cells to oscillate along the X and Y axes directions respectively, the centers of oscillation of the cells corresponding to the intersection point of the cross hairs. If the projected image of the hole is off center, a cell or cells will be exposed to light longer on one side of its center position than on the other. Stated differently, the projected image will only be centered when the scanning cells are exposed to light for equal time intervals on either side of their center of oscillation positions. The difference in such time intervals is used to generate a corrective signal for operating the servos to effect precise center positioning.
REFERENCES:
patent: 3293439 (1966-12-01), Marantette et al.
patent: 3716716 (1973-02-01), Marantette et al.
patent: 4100405 (1978-07-01), Kondrollochis
Marantette Ruth B.
Marantette William F.
Gatto J.
Nelms David C.
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