Device for detecting strain and foreign matters in glass container by a non-storage type pickup tube

A device for detecting strain and foreign matter in a glass container, comprising:

• means for moving a glass container;
• a light source located on one side of the glass container placed and moving means;
• a polarizer transmittting vibration only in one direction of light from said light source and located between the light source and the glass container;
• an analyzer placed on the other side of the glass container so that the optical axis of the analyzer intersects that of the polarizer at right angles;
• means for rotating said glass container on said moving means.
• a non-storage type pickup tube for receiving on a photoelectric surface thereof an image of the glass container placed on said moving means;
• position detecting means for detecting from said moving and feed means the position and speed of the glass container;
• said non-storage type pickup tube being provided so that the image on the photoelectric surface thereof of the glass container in rotational movement is always scanned along the center line in a longitudinal direction in synchronism with the speed of movement of the glass container, whereby:
• an abnormal electrical output of the image of the glass container due to light depolarized by foreign matter in the glass container and double deflection caused by strain in the glass container is detected from a constant electrical output of the image changed photoelectrically by the non-storage type pickup tube to thus ensure the rejection of a defective glass container.