Pitch match detecting and counting system with tilted optical ax

Details Pitch match detecting and counting system with tilted optical ax Pitch match detecting and counting system with tilted optical ax

1988-09-12

1990-03-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

377 53, G01V 904, H01J 4014

Patent

active

049123173

ABSTRACT:
An apparatus for automatically counting stacked sheet-like materials having sheet-to-sheet brightness gradients alternating between positive and negative while simultaneously eliminating problems encountered when the sheet edge reflectance characteristics have combined lambertian and specular reflective natures. Rectification of a pitch matched sensor array's data output combined with a selective disposition of the sensor and illumination optical components relative to the sheet edges to be counted based upon the maximum acceptance angle of the optical system yields the improved count data necessary to achieve accurate counting.

REFERENCES:
patent: 3234360 (1966-02-01), Schooley, Jr.
patent: 3581067 (1971-05-01), Willits et al.
patent: 3692985 (1972-09-01), Kalman
patent: 3790759 (1974-02-01), Mohan et al.
patent: 3835306 (1974-09-01), Bills et al.
patent: 4066173 (1978-01-01), Adams et al.
patent: 4639592 (1987-01-01), Heitmann
patent: 4694474 (1987-09-01), Dorman et al.

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