US 4,559,452 AGranted

Apparatus for detecting edge of semitransparent plane substance

AssigneeFujitsu Limited

InventorsSeigo Igaki, Tadao Nakakuki, Takefumi Inagaki, Shuetsu Oikawa, Takashi Fujimura

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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.

Claims10

Dependent claims

means, operatively connected to the light source array and said photosensor array, for selecting a light source and photosensor pair and for providing a selection signal;
means, operatively connected to said selecting means, for driving the selected light source and photosensor pair;
and
means, operatively connected to said photosensor array, for comparing the outputs of each of the plurality of photosensors, when the semitransparent plane substance between the light source array and the photosensor array is not detected, with the corresponding outputs of each of the plurality of photosensors when the semitransparent plane substance between the light source array and the photosensor array is detected, thereby detecting the edge portion of the semitransparent plane substance.

1 more element

Dependencies are inferred from the claim text.