Eisai Company, Limited

Tsugutoshi Sugiyama

Ryosaku Tagaya

Apparatus for detecting foreign matters by illuminating foreign matters which swirl together with a liquid in a transparent container and measuring transmitted light. Transparent containers filled with liquid are fed one by one to the receiving seats on the transferring board which moves continuously at a fixed speed. The transparent container on the receiving seat, upon arrival at a certain position, is turned at a high speed, while being transferred continuously. Foreign matters that might be preset in liquid are caused to suspend in the liquid. The transparent container, with foreign matters suspended, is moved to the position where the optical detector is located, then the optical detector begins to move in synchronism with the transferring board. During this synchronous movement the container is illuminated by the light source in the optical detector and the light which has been transmitted through the liquid is received by the optical detector. Judgement for acceptance or reject is made according to the quantity of light received. Upon completion of the judging action, the optical detector alone is restored quickly for subsequent judging action.

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Akishima, Japan

Tsugutoshi Sugiyama