| 摘要 |
The invention relates to an optical imaging system for imaging an object with progressively adjustable magnification. The inventive system comprises an imaging plane for projecting an image field originating from the object and an imaging optical system situated on the object side in front of the imaging plane, preferably with a fixed focal length for producing the image field on the imaging plane. Said imaging optical system and/or said imaging plane are arranged so that they can move in the direction of the optical axis in order to adjust the magnification and/or focus the image appearing on the imaging plane. A first optical element which receives optical radiation through a wide angle is provided on the object side in front of the imaging optical system to select and/or transmit those light beams originating from the object, said light beams running through a predetermined focal point or nodal point, and a second optical element is positioned between the first optical element and the imaging optical system in such a way that the light beams running through the predetermined focal or nodal point produce an image of the object in an intermediate image plane. This image can then be projected by the imaging optical system into the imaging plane in various sizes in such a way as to produce an image field with varying magnification in the area of the imaging plane. |
