| 摘要 |
PURPOSE:To obtain compactly a necessary illuminating light at a low cost by placing an emitting end of an optical fiber bundle for leading an illuminating light, in the vicinity of an objective lens. CONSTITUTION:In a light source box 4 which has been provided separately from a microscope part 1, a reflecting mirror 5, a light source 6 and an incident end 7a of an optical fiber bundle 7 are placed, so that an object to be photographed E can be illuminated through an objective lens 2. In case when the optical fiber bundle 7 is long enough, a luminous flux which has been made incident on the optical fiber bundle 7 is brought to made mixing enough in each optical fiber, and emitted as a luminous flux having an expanse conforming to a numerical aperture NA being an intrinsic brightness which the optical fiber has. When such a luminous flux is condensed to an object to be inspected E being in a focal position of an objective lens 2, by the objective lens 2, if a focal distance of the objective lens 2 is denoted as (f), a circular illuminating field having a magnitude of phi=2f tantheta is formed on the object to be inspected E.
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