Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1977-03-18
1978-06-27
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
356152, 356172, G01N 2130
Patent
active
040977501
ABSTRACT:
The orientation of an industrial part such as a microcircuit chip having a pattern of dominant parallel lines is determined by an optical method. An image of the parallel line pattern is smeared or defocused in a known direction such that the resultant smeared image of the part reveals the lines in sharp detail when they are parallel to the known direction of smearing and are blurred if the lines are angularly displaced from the known direction. By rotating the image of the pattern relative to the smear direction and determining the angle at which maximum sharpness occurs, the angular orientation is determined. By correlating the pattern of sharp lines of the smeared image with a similar reference pattern of known position, the positional orientation of the part is also determined. When two angularly displaced families of parallel lines are present on the object, positional coordinates relative to two axes are determined.
REFERENCES:
patent: 3683195 (1972-08-01), Johannsmeier
patent: 3867038 (1975-02-01), Westell
patent: 3943359 (1976-03-01), Matsumoto et al.
Faxvog Frederick R.
Joseph Bernard W.
Lewis Robert W.
General Motors Corporation
Hill Warren D.
Nelms David C.
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