Patent ID: 9025246
Filing Date: 2015-05-05
Classification: G02B

Abstract:
1. An observation system configured to observe a translucent observation target, contained in a translucent container having a bottom surface and a side surface surrounding the bottom surface, the observation system comprising: a container holding unit configured to hold the container; a ring illumination including a light source in a ring shape having a predetermined radius, the ring illumination arranged in a position opposed to an outer bottom surface of the container so that a central axis of the ring illumination is aligned to a central axis of the bottom surface of the container held by the container holding unit, and configured to irradiate the container with light, when the observation target is observed; a first light-shielding plate in a ring shape, arranged between the ring illumination and the container holding unit so that a central axis of the first light-shielding plate is aligned to the central axis of the ring illumination, the first light-shielding plate having an inner diameter capable of varying around the central axis, the first light-shielding plate configured to shield light from the ring illumination; a lens, arranged in a position opposed to an inner bottom surface of the container held by the container holding unit, to observe the observation target in the container illuminated by the ring illumination; and a second light-shielding plate arranged, in an internal space of the ring illumination, so that a central axis of the second light-shielding plate is aligned to a central axis of the ring illumination, the second light-shielding plate having an outer diameter capable of varying around the central axis, the second light-shielding plate configured to shield light from the ring illumination,