Objective lens for a surgical microscope, surgical microscope, as well as a method for adjusting an objective

摘要

Objective lens for a surgical microscope (10), comprising a first, the object-side subcomponent (11, 14), a second optical subcomponent (12, 15) and at least one further third optical subcomponent (13, 16), wherein the second optical subcomponent (12, 15) at a distance (d2) to the first optical subcomponent (11, 14) and the third optical subcomponent (13, 16) at a distance (d1) to the second optical subcomponent (12, 15) on the optical axis of the objective lens (1) is arranged and at least two of the three optical components (11, 12, 13, 14, 15, 16) are displaceable along the optical axis, that for focusing a relative position of the object-side first optical subcomponent (11, 14) of the objective lens (1) with respect to the other two optical components (12, 13, 15, 16) is variable, that the optical components (11, 12, 13, 14, 15, 16) of the objective lens (1) are designed so that the beam of rays, which consists of the third optical subcomponent (13, 16) in the direction of the observer, run parallel to one another, that the first optical subcomponent (11, 14) a negative refractive power, the second optical subcomponent (12, 15) a positive power and the third optical subcomponent (13, 16) has a negative power, or that the first optical subcomponent (11, 14) a positive power, the second optical subcomponent (12, 15) a negative refractive power and the third optical subcomponent 13, 16) has a positive power that the objective has a zoom function, and that, for zooming at least two of the three optical components (11, 12, 13, 14, 15, 16) independently of one another in respect of the third optical subcomponent are configured to be displaceable, that the working distance of the objective lens (1) is variable and that the focal length can be varied independently of the working distance.