Detection unit and confocal laser microscope

1. A confocal laser microscope comprising:

a scanner unit that includes a scanning optical system and a scanner housing, the scanning optical system reflecting illumination light emitted from a light source, scanning the illumination light over a sample, reflecting returning light from the sample at the same position as a reflecting position of the illumination light, and returning the returning light along an optical path of the illumination light, the scanner housing accommodating the scanning optical system therein and having a scanner exit port through which the returning light returned along the optical path of the illumination light by the scanning optical system exits outward in a predetermined optical form; and

a plurality of the detection units

wherein each detection unit comprises:

a detector entrance port through which light in a predetermined optical form enters;

a detecting section that detects at least a portion of the light entering through the detector entrance port;

a detector exit port through which at least another portion of the light entering through the detector entrance port can exit in the same optical form, and

a detector housing that accommodates the detecting section therein and that has the detector entrance port and the detector exit port, and

wherein the scanner housing and each detector housing are configured to be detachably attachable to each other so that, when attached to each other, optical axes of returning light exiting through the scanner exit port and returning light entering through the detector entrance port are aligned, and wherein the detector housings are configured to be detachably attachable to each other so that, when attached to each other, optical axes of returning light exiting through the detector exit port and returning light entering through the detector entrance port are aligned.

2. The confocal laser microscope according to claim 1 , wherein the scanner unit includes a pinhole disposed at a position conjugate with respect to the sample, and wherein the pinhole limits a bundle of rays of the returning light exiting through the scanner exit port.

3. The confocal laser microscope according to claim 1 , wherein each detection unit is configured so that the detector entrance port and the detector exit port are disposed in an optical axis of the returning light exiting through the scanner exit port in a state where each detector housing is attached to the scanner housing, and each detection unit is configured so that the detector entrance port and the detector exit port are disposed in an optical axis of the returning light exiting through the detector exit port of the other detector housing in a state where the detector housing is attached to another detector housing.

4. The confocal laser microscope according to claim 1 , wherein a first one of the detection units is attached to the scanner unit, and a second of the detection units is attached to the first one of the detection units, and

wherein detection sensitivities between the detecting section of the first one of the detection units and the detecting section of the second of the detection units are different from each other.

5. The detection unit according to claim 1 , wherein each of the detection units further comprises a splitter that splits an optical path of the light entering through the detector entrance port, causes light in one of the split optical paths to enter the detecting section, and causes light in another optical path to enter the detector exit port.

6. The detection unit according to claim 1 , wherein the light entering through the detector entrance port of each of the detection units has the optical form of collimated light.

7. The detection unit according to claim 6 , wherein each of the detection units further comprises a relay optical system that relays the light entering through the detector entrance port without changing the predetermined optical form thereof.