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Abstract

In a reflected-light type fluorescence microscope having a turret type filter cassette capable of switching a plurality of excitation filters, a plurality of barrier filters, and a plurality of dichromatic mirrors and selecting a desired set of excitation filter, barrier filter, and dichromatic mirror upon rotation of a turret to perform fluorescence observation of a specimen, the excitation filters, barrier filters, and dichromatic mirrors are directly mounted on the turret. The turret has a shape obtained by cutting the sharp portion of a polyhedral pyramid (for example, octahedral pyramid) having a rotation axis as its central axis along a plane perpendicular to the central axis. The eight equiangular conical surfaces make 45.degree. with the illumination and observation optical axes. Through holes are formed in the 45.degree. conical surfaces to assure an optical path. The dichromatic mirrors are mounted to close the through holes such that the surfaces opposite to the reflection surfaces of the dichromatic mirrors serve as mounting surfaces.

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First Claim