Apparatus for detecting a particle agglutination pattern

摘要

An apparatus for detecting photoelectrically a particle agglutination pattern formed on a conical bottom surface of a reaction vessel is disclosed. A lamp and a diffusion plate are arranged above the reaction vessel to illuminate the particle pattern and an objective lens and a light detector are arranged underneath the reaction vessel to form an image of the particle pattern on the light detector. In order to prevent a relatively sharp image of the diffusion plate from being formed on the light detector, an optical correction plate having a conical projection formed in its lower surface is arranged immediately below the reaction vessel. The optical correction plate may be secured to a lower surface of the reaction vessel or may be integrally formed with the reaction vessel on its lower surface.