Observation apparatus and observation method

Abstract

The observation apparatus disclosed herein includes: a light source unit comprising a belt-type illumination unit that outputs observation light having a belt-shaped illumination pattern; an illumination unit comprising an objective lens with the observation surface of the object being observed as the focal plane, which illuminates the object being observed; and an imaging unit that captures images of the observation surface. The imaging unit can detect reflected light from the observation light incident on the object being observed through the illumination unit, and can also detect reflected light emitted from the object being observed through the observation surface and then re-passing through the illumination unit. The light source unit includes a focus adjustment unit that can adjust the focus of the light source unit in such a way that the conjugate surface of the belt-type illumination unit coincides with the pupil plane of the objective lens in the optical path of the reflected light of the observation light.