The invention relates to an apparatus for counting numbers of microscopic fine particles such as blood corpuscles, and more particularly to an apparatus which ensures a more accurate counting of such fine particles with ease in operation.
Apparatus which have been used conventionally to this end are generally based on an impedance method or a photoelectrical scanning method. The apparatus based on the impedance method usually suffer from unfavorable disturbance caused by noises, and an opening in its detector is apt to be soon clogged with impurities or fine particles to be counted. The other known apparatus for the photoelectric scanning are highly complex in view of its mechanism for driving a sample holder and its photoelectrical or electrical mechanism, so it is difficult to operate the apparatus which unavoidably costs too much.
A more frequent blood counting is recently being required by physicians. However, blood cells in blood samples will coagulate or be broken as time passes so that correct measurements of them become difficult.
Such circumstances have given rise to a demand for a better apparatus which will enable the physicians to perform an easy rapid blood count soon after a sampling of blood. Such improved apparatus is also needed in many other fields of science and industry in which a rapid counting of fine microscopic particles must be correctly conducted.