Inverted microscope provided with blockage member for preventing spillage of fluid

1. An inverted microscope comprising:

a lens holding mechanism which includes a fixation part and a movable part fitted to cover the fixation part, wherein the movable part holds an objective lens so that the objective lens can revolve around a predetermined axis, and wherein the objective lens is arranged under a stage on which a sample can be placed;

a focusing mechanism which holds the fixation part of the lens holding mechanism at an upper part of the focusing mechanism, and which moves the objective lens up and down together with the lens holding mechanism,

a microscope main body which serves as a casing including the focusing mechanism therein, and which includes an opening through which the focusing mechanism and the lens holding mechanism are connected, wherein the opening is provided in an upper wall surface of the microscope main body; and

a blockage member which is provided so as to be revolvable together with the movable part, and which blocks an intrusion of fluid spilled onto the lens holding mechanism into the opening,

wherein a size of the lens holding mechanism and the blockage member projected onto a horizontal plane is larger than a size of the opening projected onto the horizontal plane.

2. The inverted microscope according to claim 1 , wherein the upper wall surface has an inclined plane which enables fluid spilled onto the upper wall surface to flow down toward a predetermined location except for the opening.

3. The inverted microscope according to claim 2 , wherein the microscope main body includes at least one of a reservoir part and a discharge path, the reservoir part accumulating fluid which is spilled onto the upper wall surface and induced to flow down via the inclined plane, and the discharge path discharging the fluid.

4. The inverted microscope according to claim 1 , wherein the microscope main body includes a protrusion part protruding upwards from the upper wall surface in a circumference of the opening.

5. The inverted microscope according to claim 4 , wherein the blockage member provided on the movable part of the lens holding mechanism includes a surrounding part which is provided integrally with the lens holding mechanism and surrounds the protrusion part.

6. The inverted microscope according to claim 1 , wherein:

the upper wall surface has an inclined plane which is substantially perpendicular to the predetermined axis around the opening, and

the microscope main body includes a protrusion part protruding upwards from the upper wall surface in a circumference of the opening.

7. The inverted microscope according to claim 6 , wherein the blockage member provided on the movable part of the lens holding mechanism includes a surrounding part which is provided integrally with the lens holding mechanism and surrounds the protrusion part.

8. The inverted microscope according to claim 6 , wherein the microscope main body includes at least one of a reservoir part and a discharge path, the reservoir part accumulating fluid which is spilled onto the upper wall surface and induced to flow down via the inclined plane, and the discharge path discharging the fluid.

9. The inverted microscope according to claim 1 , wherein the blockage member is provided in a periphery part of the movable part around the predetermined axis.

10. The inverted microscope according to claim 1 , further comprising:

a stage supporting mechanism which is provided in the microscope main body, supports the stage, and makes the stage horizontally protrude from an opening which is dedicated to the stage and formed in the microscope main body; and

a stage blockage member which is provided on the stage and blocks an intrusion of fluid spilled onto the stage into the opening dedicated to the stage.