Microscope having a photometer

Claim 1

A microscope apparatus without an additional, separately disposed viewing telescope comprising: a. first optical means defining a main optical path for microscopic examination of an object positioned on a stage, said first optical means comprising in a first subassembly an illuminator with a field lens and a radiant field stop, a condenser, and an objective positioned in a first housing; in a second subassembly, mirrors, optical lenses, and a movable light blocking stop, defining a folded portion of the main optical path and positioned in a laterally extending intermediate tube coupled to said first housing; b. second optical means for dividing said main optical path into an observation path and a measurement path, one of which is angularly displaced from said main path, said second optical means comprising a beam splitter and a triple mirror positioned in said intermediate tube; c. third optical means defining a restrictive aperture the area of which may be varied, said third optical means comprising a measuring slit, said aperture being located in said measurement path between a folding mirror and a lens, said beam splitting means causing an image of said aperture to be formed in said observation path; d. fourth optical means for ocular observation comprising an ocular positioned in an ocular tube coupled to said intermediate tube for simultaneously observing the images of said object and of said aperture, said image of said aperture positioned to indicate that portion of said object from which the illumination will be measured; e. fifth optical means for illuminating said aperture to permit observation thereof, said optical means comprisIng a light source and said folding mirror; f. sixth optical means positioned in said measurement path to photometrically receive and measure the intensity of light from said main optical path after passage of said light through said lens and said measuring slit and impingement on a photomultiplier; and g. said triple mirror positioned in said measurement path and located after said beam splitter in said intermediate tube for reflecting the image of said aperture into said observation path.