Transmission type illuminating device for stereomicroscopes

摘要

A transmission type illuminating device for stereomicroscopes formed by arranging in the order mentioned a light source, a collector lens, a pair of light source image forming lenses located in positions symmetrical with respect to the optical axis of the collector lens and a relay lens for light source images arranged on the same optical axis as of the collector lens in order that a uniform bright illumination may be always made irrespective of the magnification and a wide uniform oblique light illumination may be also easily made. The light source is arranged in a position conjugate with a sample placing surface with respect to the collector lens and relay lens for the light source image and the pair of light source image forming lenses are so arranged that their respective optical axis may coincide respectively with a pair of rays from the light source intersecting at the sample placing surface and respectively entering a pair of entrance pupils of a stereomicroscope and the light source images to be formed by the pair of light source image forming lenses may be in positions conjugate respectively with the above mentioned pair of entrance pupils with respect to the relay lens for light source images.