| 摘要 |
PURPOSE:To execute positioning automatically, etc. of a glass sheet, by making a reflected light from a glass surface and a transparent pattern pass through a polarizing plate, and detecting a non-polarizing reflected light from the transparent pattern, as a difference of contrast against a polarizing reflected light from the glass surface. CONSTITUTION:A positioning transparent pattern 12 is provided on a transparent glass sheet 11, and is placed on a turntable 13. Light from a light source 14 is made incident to the glass sheet 11, and its reflected light is led to an image pickup tube 16 through a polarizing plate 15. The polarizing plate 15 is placed in the direction where the polarizing reflected light from the glass sheet 11 is seen darkly, the turntable 13 is moved by information from the image pickup tube 16, and when the incident light catches the transparent pattern 12 on the glass sheet 11, a non-polarizing reflected light (bright light) from the transparent pattern appears in the reflected light, position information is generated, the turntable 13 is moved so that the glass sheet 11 comes a desired cut position, and positioning is executed automatically and exactly. |
