Scanning microscope and method for optically scanning one or more samples

1. A structural unit for a microscope, the structural unit comprising:

a housing ( 22 );

a focusing lens system ( 24 ) arranged in the housing ( 22 ), wherein the focusing lens system ( 24 ) focuses an illuminating light beam ( 32 ) of the microscope onto an area of a sample ( 36 ) to be examined; and

an actuator arrangement which moves the focusing lens system ( 24 ) relative to the housing ( 22 );

wherein the structural unit is adapted to be used as an objective insert for a microscope without a scanning function to convert the microscope without a scanning function into a scanning microscope.

2. The structural unit according to claim 1 , wherein the focusing lens system ( 24 ) is movably coupled to the housing ( 22 ) by at least one retaining element ( 30 ).

3. The structural unit according to claim 1 , further comprising a collimation lens system which collimates the illuminating light beam ( 32 ).

4. The structural unit according to claim 3 , wherein the actuator arrangement moves the focusing lens system ( 24 ) transversely with respect to a center axis of the collimated illuminating light beam ( 32 ) according to a prescribed scanning pattern.

5. The structural unit according to claim 1 , wherein the actuator arrangement moves the focusing lens system ( 24 ) transversely in a first spatial direction (x) and in a second spatial direction (y) with respect to the center axis of the illuminating light beam ( 32 ).

6. The structural unit according to claim 5 , wherein the actuator arrangement moves the focusing lens system ( 24 ) in a third spatial direction (z) along the center axis of the illuminating light beam ( 32 ).

7. The structural unit according to claim 3 , wherein a projection of the collimated illuminating light beam ( 32 ) totally overlaps an optically active area of the focusing lens system ( 24 ).

8. The structural unit according to claim 7 , wherein a projection of the collimated illuminating light beam ( 32 ) fully overlaps the optically active area of the focusing lens system ( 24 ) at different positions of the focusing lens system ( 24 ) when the focusing lens system ( 24 ) is moved according to the prescribed scanning pattern.

9. The structural unit according to claim 1 , wherein the focusing lens system ( 24 ) is coupled to the actuator arrangement via a carrier member ( 26 ), and wherein the carrier member ( 26 ) comprises a shutter which shuts out part of the illuminating light beam ( 32 ).

10. The structural unit according to claim 9 , wherein the focusing lens system ( 24 ) or the carrier member ( 26 ) is movably coupled to the housing ( 22 ) by means of at least one retaining element ( 30 ).

11. The structural unit according to claim 1 , further comprising a front glass ( 54 ) arranged between the focusing lens system ( 24 ) and the sample ( 36 ), wherein the focusing lens system ( 24 ) moves relative to the front glass ( 54 ).

12. The structural unit according to claim 1 , further comprising an opaque partition arranged to protect at least one of the illuminating light beam ( 32 ) and the focusing lens system ( 24 ) from ambient light.

13. A method of converting a microscope without a scanning function into a scanning microscope, the method comprising the steps of:

providing a structural unit comprising (i) a housing ( 22 ), (ii) a focusing lens system ( 24 ) arranged in the housing ( 22 ), wherein the focusing lens system ( 24 ) focuses an illuminating light beam ( 32 ) of the microscope onto an area of a sample ( 36 ) to be examined, and (iii) an actuator arrangement which moves the focusing lens system ( 24 ) relative to the housing ( 22 ); and

installing the structural unit as an objective insert onto the microscope, whereby the microscope is converted into a scanning microscope.