Microscope illumination apparatus

1. A microscope illumination apparatus for a microscope with a revolver onto which an objective of the microscope is mounted, the revolver including a slider mounting unit, and the microscope illumination apparatus comprising:

a slider which is insertable into and removable from the revolver via the slider mounting unit;

a dark-field illumination unit provided in the slider, the dark-field illumination unit including dark-field-illumination light sources that are arranged in a ring, the dark-field illumination unit being configured to be provided at a prescribed position at which an observation optical axis of the microscope coincides with a center of the ring;

a detector that is configured to detect whether the slider is arranged in or deviated with respect to a prescribed position of the revolver, wherein the detector is configured to output a turn-on signal when it is detected that the slider is arranged in the prescribed position, and the detector is configured to output a turn-off signal when it is detected that the slider is deviated with respect to the prescribed position; and

a controller that is configured to control the dark-field-observation light sources to be turned on or off in accordance with an output of the detector.

2. The microscope illumination apparatus according to claim 1 , wherein the slider includes an optical element for differential interference observation, in addition to the dark-field illumination unit.

3. The microscope illumination apparatus according to claim 1 , wherein the dark-field-illumination light sources are each a semiconductor element.

4. The microscope illumination apparatus according to claim 3 , wherein the controller is configured to perform control to change colors of the dark-field-illumination light sources.

5. The microscope illumination apparatus according to claim 1 , wherein the dark-field-illumination light sources are each a fluorescent tube.

6. The microscope illumination apparatus according to claim 1 , wherein the dark-field-illumination light sources are divided into a prescribed number of blocks in a circumferential direction, and the controller is configured to control a direction of oblique illumination by turning on a specified block of the prescribed number of blocks.

7. The microscope illumination apparatus according to claim 6 , wherein the controller is configured to control the dark-field-illumination light sources to be turned on in block units.

8. The microscope illumination apparatus according to claim 6 , wherein the controller is configured to control the dark-field-illumination light sources to be turned on in block units in an arbitrary order specifying the blocks in the circumferential direction.

9. The microscope illumination apparatus according to claim 1 , wherein the controller controls a display to display respective illumination states.

10. A microscope illumination apparatus comprising:

a dark-field illumination unit including dark-field-illumination light sources that are arranged in a ring, the dark-field illumination unit being configured to be removably provided at a prescribed position at which an observation optical axis of the microscope coincides with a center of the ring;

a detector that is configured to detect whether the dark-field illumination unit has been arranged in the prescribed position, wherein the detector the detector is configured to output a turn-on signal when it is detected that the dark-field illumination unit has been arranged in the prescribed position, and the detector is configured to output a turn-off signal when it is detected that the dark-field illumination unit is deviated with respect to the prescribed position; and

a controller that is configured to control the dark-field-observation light sources to be turned on or off in accordance with an output of the detector,

wherein:

the dark-field illumination unit is provided within a revolver in at least one mounting unit of a plurality of mounting units for mounting an objective, the plurality of mounting units being provided in the revolver, and

the detector detects, based on a rotation position of the revolver, whether the at least one mounting unit has been arranged in or deviated with respect to the prescribed position, the at least one mounting unit being provided with the dark-field illumination unit.

11. A microscope illumination apparatus comprising:

a dark-field illumination unit including dark-field-illumination light sources that are arranged in a ring, the dark-field illumination unit being configured to be removably provided at a prescribed position at which an observation optical axis of the microscope coincides with a center of the ring;

a detector that is configured to detect whether the dark-field illumination unit has been arranged in the prescribed position, wherein the detector the detector is configured to output a turn-on signal when it is detected that the dark-field illumination unit has been arranged in the prescribed position, and the detector is configured to output a turn-off signal when it is detected that the dark-field illumination unit is deviated with respect to the prescribed position; and

a controller that is configured to control the dark-field-observation light sources to be turned on or off in accordance with an output of the detector,

wherein:

the dark-field illumination unit is provided in an objective, and

the detector detects whether the objective has been mounted onto a prescribed mounting unit of a revolver for mounting the objective.