Objective lens assembly for phase contrast microscope and phase contrast microscope including the same

摘要

The present invention provides an objective lens system having a long working distance and a phase difference microscope including the objective lens system. The objective lens system according to the present invention includes, sequentially from the object side, a first lens group, a second lens group, a third lens group, a fourth lens group, a fifth lens group, a phase plate, a sixth lens group, And an eighth lens group. The third lens group has a positive refractive power. In this case, the third lens group has a third lens and a fourth lens bonded to each other. The upper surface of the third lens and the object-side surface of the fourth lens are bonded to each other. The third lens has negative (-) refractive power. The fourth lens has a fourth lens having a positive refractive power.