| 摘要 |
A video microscope having an observation stand whose position is fixed relative to an object, a lens body tube having a lens system arranged at one end thereof along an imaging optical path with respect to the object and that is inserted into the observation stand so as to movable in the optical axis direction, a video signal converting section tube that has an image pick-up element arranged at a predetermined position that corresponds to the lens system, and movable in the optical axis direction relative to the observation stand and movable relative to the lens body tube. The video microscope further includes an object distance adjustment drive motor that moves the lens body tube in the optical axis direction by driving an object distance adjusting mechanism and an objective distance position detecting system. The objective distance adjusting mechanism adjusts the objective distance between the object and a principal point on the object side of the lens system The object distance position detecting sensor detects the objective distance. The video microscope also includes an object imaging distance adjustment drive motor that moves the video signal converting section tube in the optical axis direction, and an arithmetic controller for setting the objective distance and the object imaging distance to predetermined positions. The arithmetic controller automatically adjusts and sets the positions of the lens body tube and the video signal converting section tube so that the object is in focus on the image pick-up element at a preset magnification.
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