Light beam emission device for a measuring device and method for changing the optical properties of a light beam

1. Light beam emission device for a measuring instrument for changing the optical properties of a laser beam, comprising

a base body with an opening for the passage of the light beam;

a head, which is arranged rotatably around a rotation axis on the base body, which corresponds substantially to the propagation direction of the light beam through the base body;

an optical element, which is arranged turnably around a turning axis on the head; and

a turning mechanism for producing a turning of the optical element around the turning axis; wherein

the turning mechanism is designed to turn the optical element to a first position and to a second position, in which second position the optical element is located in the light beam, so that the optical properties the light beam are changed depending on of the function of the optical element.

2. Light beam emission device according to claim 1 , wherein the turning mechanism is designed to turn the optical element by a rotation of the head around the rotation axis relative to the base body around the turning axis.

3. Light beam emission device according to claim 1 , wherein the first position corresponds to a position in which the optical element is located outside of the light beam.

4. Light beam emission device according to claim 1 , wherein the turning mechanism is designed to turn, depending on the rotation direction of the head, around the rotation axis of the optical element from the first position to the second position or from the second position to the first position.

5. Light beam emission device according to claim 1 , wherein the turning mechanism comprises a swing which is connected turnably around the turning axis to the head, and which is connected to the optical element.

6. Light beam emission device according to claim 5 , wherein the turning mechanism comprises a lifting device which is attached movably on the base body, and which, in a lifted state, touches the swing, in order to turn the optical element connected to the swing during a rotation around the rotation axis.

7. Light beam emission device according to claim 6 , wherein the swing and the lifting device each have a cog, cogs which, in the lifted state, engage during a rotation.

8. Light beam emission device according to claim 6 , wherein the lifting device has an electromagnet for producing the lifted state.

9. Light beam emission device according to claim 6 , wherein the swing has an apron which, in case of contact with the lifting device, loosens a latching of the swing, so that the swing can turn freely around the turning axis.

10. Light beam emission device according to claim 1 , wherein the turning mechanism has a measuring body which is turnably connected to the head and turnable around the turning axis, and which is connected to the optical element and, depending on the rotation speed, turns the optical element around the turning axis to the first or second position.

11. Light beam emission device according to claim 1 , wherein the head has an additional optical element, which deflects at least portions of the light beam in a direction which is substantially orthogonal to the rotation axis.

12. Light beam emission device according to claim 11 , wherein the turning mechanism is designed to turn the optical element to the second position, position in which the optical element is located in the at least partially deflected light beam, so that the optical properties of the light beam are changed depending on the function of the optical element.

13. Light beam emission device according to claim 1 , further comprising a multifunctional unit containing the optical element, which is arranged turnably around the turning axis on the head, in order to turn the multifunctional unit with the optical element to the first position, position in which the optical element is located outside and another portion of the multifunctional unit is located inside the light beam.

14. Light beam emission device according to claim 13 , wherein the other part of the multifunctional unit changes the optical properties of the light beam depending on the optical function thereof.

15. Light beam emission device according to claim 1 , wherein the function of the optical element includes at least one of the following:

weakening, focusing to a point, fanning out, focusing to a line, deflecting, and filtering.

16. Measuring instrument, particularly laser leveling apparatus, with the light beam emission device according to claim 1 .

17. Method for changing the optical properties of a light beam of a light beam emission device of a measuring instrument with a base body and a head, comprising

rotating the head relative to the base body around a rotation axis which substantially corresponds to the propagation direction of the light beam through the base body; and

turning, by a rotation of the head around the rotation axis, an optical element which rotates with the head and is arranged turnably around a turning axis on the head, wherein

the optical element is turned to a position in which the optical element is located in the light beam, so that the optical properties of the light beam are changed depending on the function of the optical element.