Operation microscope has image projection module containing image display unit, plane convex lens and plane concave lens with focal length ratio between 1.9 and 2.5

摘要

The microscope has an observation unit (3) for observing an object (5) and an image projection module (7) for entering image information into the observation unit, whereby the image projection module contains an image display unit (11). The image projection module contains a plane convex lens and a plane concave lens. The ratio of the focal lengths of the plane convex and concave lenses is greater than 1.9 and less than 2.5.