Microscope and microscope light source unit

1. A microscope comprising:

a first epi-illumination light-source unit configured to perform fluorescence observation;

a second transmitted-illumination light-source unit configured to perform transmission observation, the second transmitted-illumination light-source unit including a light source provided with a light emitting element that emits excitation light and a fluorescent substance that emits fluorescence upon irradiation with the excitation light; and

an incidence limiting section configured to limit incidence of light on the light source from an outside of the second light source unit during a light-off period of the light emitting element,

wherein the incidence limiting section is configured to remove an incidence limitation of the light from the outside while the light emitting element is being lit.

2. The microscope according to claim 1 , wherein the incidence limiting section is configured to start the incidence limitation of the light from the outside upon turning-off of the light emitting element.

3. The microscope according to claim 2 , wherein the second light source unit includes a switch to switch a state of the light emitting element between a light-on state and a light-off state, and the incidence limiting section is configured to remove or start the incidence limitation of the light from the outside in conjunction with an operation of the switch.

4. The microscope according to claim 2 , wherein the second light source unit includes a switch that switches a state between an ON state and an OFF state in accordance with a state of the light emitting element that includes a light-on state and a light-off state, and the incidence limiting section is configured to remove or start the incidence limitation of the light from the outside in conjunction with an operation of the switch.

5. The microscope according to claim 2 , wherein the incidence limiting section is configured to remove the incidence limitation of the light from the outside in conjunction with energizing of the light emitting element.

6. The microscope according to claim 2 , wherein the incidence limiting section is configured to remove the incidence limitation of the light from the outside in conjunction with light emission of the light emitting element.

7. The microscope according to claim 3 , wherein the incidence limiting section is a shutter which is capable of being inserted in and withdrawn from an outgoing light path of mixed light that is a mixture of the excitation light and the fluorescence and which blocks the light from the outside, and the shutter is located on the outgoing light path during the light-off period of the light emitting element.

8. The microscope according to claim 3 , wherein the incidence limiting section is a light path switching section that is located on an outgoing light path of mixed light that is a mixture of the excitation light and the fluorescence and that switches a light path of the light from the outside, and the light path switching section is configured to lead the light from the outside in a direction deviating from the light source during the light-off period of the light emitting element.

9. A microscope light source unit comprising:

a light source provided with a light emitting element that emits excitation light and a fluorescent substance that emits fluorescence upon irradiation with the excitation light; and

an incidence limiting section configured to limit an incidence of light on the light source from an outside during a light-off period of the light emitting element,

wherein the incidence limiting section is configured to remove an incidence limitation of the light from the outside while the light emitting element is being lit.

10. The microscope light source unit according to claim 9 , wherein the incidence limiting section is configured to start the incidence limitation of the light from the outside upon turning-off of the light emitting element.

11. The microscope light source unit according to claim 10 , further comprising a switch configured to switch a state of the light emitting element between a light-on state and a light-off state,

wherein the incidence limiting section is configured to remove or start the incidence limitation of the light from the outside in conjunction with an operation of the switch.

12. The microscope light source unit according to claim 10 , further comprising a switch configured to switch a state between an ON state and an OFF state in accordance with a state of the light emitting element that includes a light-on state and a light-off state,

wherein the incidence limiting section is configured to remove or start the incidence limitation of the light from the outside in conjunction with an operation of the switch.

13. The microscope light source unit according to claim 10 , wherein the incidence limiting section is configured to remove the incidence limitation of the light from the outside in conjunction with energizing of the light emitting element.

14. The microscope light source unit according to claim 10 , wherein the incidence limiting section is configured to remove the incidence limitation of the light from the outside in conjunction with light emission of the light emitting element.

15. The microscope light source unit according to claim 11 , wherein the incidence limiting section is a shutter which is capable of being inserted in and withdrawn from the outgoing light path of mixed light that is a mixture of the excitation light and the fluorescence and which blocks the light from the outside, and the shutter is located on the outgoing light path during the light-off period of the light emitting element.

16. The microscope light source unit according to claim 11 , wherein the incidence limiting section is a light path switching section that is located on an outgoing light path of mixed light that is a mixture of the excitation light and the fluorescence and that switches a light path of the light from the outside, and the light path switching section is configured to lead the light from the outside in a direction deviating from the light source during the light-off period of the light emitting element.