Apparatus for detecting edge of semitransparent plane substance

Details Apparatus for detecting edge of semitransparent plane substance Apparatus for detecting edge of semitransparent plane substance

1983-05-27

1985-12-17

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250561, 2502221, 356386, G01N 2186

Patent

active

045594520

ABSTRACT:
An apparatus for detecting an edge of a semitransparent plane substance provided with a light source array including a plurality of light sources and a photosensor array including a plurality of photosensors. A selection circuit selects a pair of one of the light sources and one of the photosensors, respectively, and a comparator circuit compares the outputs of each of the photosensors in each pair when no detected substance exists between the light source array and the photosensor array, and the corresponding outputs when a substance exists between the light source array and the photosensor array, so that the edge portion of the substance can be detected.

REFERENCES:
patent: 3396278 (1968-08-01), Hjorth
patent: 3761723 (1973-09-01), De Cock
patent: 3781115 (1973-12-01), Rader et al.
patent: 4267443 (1981-05-01), Caroll et al.
patent: 4313109 (1982-01-01), Funk et al.
patent: 4406996 (1983-09-01), Oka

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