Opposing illumination type edge part detector

Abstract

Abstract PURPOSE:To perform high-precision edge part detection with good reproducibility by driving plural light source arrays and photosensors arranged corresponding to them selectively in pairs, and comparing photosensor outputs generated according to whether a body to be detected is present or not. CONSTITUTION:Light emission and photodetection characteristic data of couples of opposing light emitting diodes and photodiodes when paper 1 is present and absent are stored in a storage circuit 82 by the 1st-the (n)th one-cycle scans. The rate of the data is found by control arithmetic circuit 81; when the rate is almost one, the paper is absent and when the rate is much less than one, the paper is present. Relative values are used as differences and variance of the light outputs of the light emitting diodes and the sensitivity of the phototransistor for the judgement, so there is no problem. Even when there is a difference in pattern of the same paper quality, it is detected on binary basis and discrimination performance is improved to widen the range of paper which can be discriminated securely.

Inventors

• 👤 Seigo Igaki
• 👤 井垣　誠吾
• 👤 Tadao Nakakuki
• 👤 中久喜　唯男
• 👤 Yushi Inagaki
• 👤 雄史 稲垣
• 👤 Shuetsu Oikawa
• 👤 修悦 及川
• 👤 Kyoji Fujimura
• 👤 藤村　恭司

Bibliographic Details