Light diffusion device

Abstract

Abstract PURPOSE: To improve detection precision by transferring only the shadows of a stain, foreign matter, etc., on the inside surface of a bottle bottom to a photoelectric converting means. CONSTITUTION: Light diffusing surfaces 11aW13a of light diffusing plates 11W13 of a light diffusing device 10 arranged between a light source 4 and a bottle bottom 3 each have uneveness on one surface at the light source 4 side, and respective surfaces 11aW13a decrease in roughness in the order from the light source 4 to the bottom 3. Therefore, parallel light from the light source 4 is diffused on the roughened surface 11 roughly to pass through the plate 11, diffused on the next roughened surface 12a having less roughness than that of the surface 11a to pass through the plate 12, and further diffused on the roughened surface 13a having the least roughness to pass through the plate 13. The transmitted light is made incident to the bottom 3 of the bottle to be checked from its external surface and passes through the bottom 3 to reach a photoelectric converting means. COPYRIGHT: (C)1982,JPO&Japio

Inventors

• 👤 Hajime Yoshida

Bibliographic Details