Microscope system with plural attachable/detachable objective lens units

1. A microscope system comprising:

a microscope main unit that generates illumination light to be radiated onto a specimen and that detects detection light from the specimen; and

a plurality of attachable/detachable objective lens units that are selectively attached to the microscope main unit,

wherein the microscope main unit includes a raining mechanism that can move an attached one of the plurality of objective lens units in an optical axis direction,

wherein each of the plurality of objective lens units includes a mounting device that is attachable to the microscope main unit and plurality of objective lenses each of which is mounted on the mounting device in an attachable/detachable manner, and each of which collects the detection light from the specimen;

wherein the plurality of objective lens units comprise:

a first objective lens unit which includes a first mounting device and with which one of a plurality of first objective lenses is selectively placeable in an optical path of the illumination light by swinging the plurality of first objective lenses attached to a swing unit that is capable of swinging about a swing axis in a direction perpendicular to an optical axis or by sliding the plurality of first objective lenses mounted on the first mounting device in a direction perpendicular to the optical axis, and

a second objective lens unit which includes a second mounting device and with which one of a plurality of second objective lenses is selectively placeable in the optical path of the illumination light by rotating the plurality of second objective lenses mounted on the second mounting device about a predetermined rotation axis;

wherein the first objective lens unit and the second objective lens unit are selectively attachable to the microscope main unit;

wherein the second objective lens unit is attachable to the microscope main unit via a mounting adaptor that is fixed to a main body of the second mounting device when the second objective lens unit is attached to the microscope main unit;

wherein a distance from a mounting position of the first objective lens unit at a side of the microscope main unit to a focal position of one of the first objective lenses that is attached to the first objective lens unit and that is placed in the optical path of the illumination light and a distance from a mounting position of the second objective lens unit to a focal position of one of the second objective lenses that is attached to the second objective lens unit and that is placed in the optical path of the illumination light are set to be mutually equal;

wherein a dimension of the first mounting device in the optical axis direction from a microscope main unit side mounting position thereof to a first objective lens side mounting position is different from a dimension of the second mounting device in the optical axis direction from an adaptor side fixing position thereof to a second objective lens side mounting position,

wherein the microscope main unit comprises a illuminator having an illumination optical system on an inside thereof, and a frame unit comprising the raising mechanism,

wherein the frame unit includes a base portion provided in a horizontal direction and a body potion formed perpendicular to the base portion, and

wherein the microscope system further comprises a height-increasing member which has a predetermined thickness and which is provided in an attachable/detachable manner between the illuminator and a top end of the body portion of the frame unit such that the height-increasing member adjusts a height of the illuminator.

2. A microscope system according to claim 1 , wherein at least one of the plurality of first objective lenses in the first objective lens unit is mountable to the first mounting device via an objective lens adaptor disposed between a mounting position in the first mounting device and the at least one of the plurality of first objective lenses, such that distances from mounting positions in the first mounting device for the plurality of first objective lenses to focal positions of the plurality of first objective lenses are set to be equal to each other.

3. A microscope system according to claim 2 , wherein the microscope main unit further comprises an arm unit to which one of the plurality of objective lens units is attached.

4. A microscope system according to claim 1 , wherein the microscope main unit further comprises an arm unit to which of the plurality of objective lens units is attached.