PROBLEM TO BE SOLVED: To easily and vividly take an image of a subject formed by illumination light in its visible light band and an observation image formed by feeble fluorescent light in its infrared light band from an observation region of the subject.SOLUTION: An imaging device is designed to take both an observation image formed by feeble fluorescent light L2 emitted from an observation region of a subject S by irradiation of excitation light L1 and a subject image formed by illumination light L1, and includes an aperture stop 10. The aperture stop 10 has a plurality of diaphragm vane members with filter parts formed therein, and includes: filter regions constituted by the filter parts of the plurality of the diaphragm vane members and an aperture region located between the filter regions. The filter region allows light in a wavelength range corresponding to the fluorescent light L2 to pass therethrough, and reduces or cuts off the light in a wavelength range corresponding to the illumination light L1. The aperture region allows light in the wavelength range corresponding to the fluorescent light L2 and light in the wavelength range corresponding to the illumination light L1 to pass therethrough. In the maximum region of an optical path in the mounting location of the aperture stop 10, the light in the wavelength range corresponding to the fluorescent light L2 is not stopped down, and the area of the aperture region can be varied.COPYRIGHT: (C)2013,JPO&INPIT【課題】照明光による可視光帯域の被写体像と、その被写体の観察部位からの赤外帯域の微弱な蛍光による観察像とを、簡便な方法で同時に鮮明に撮影する。【解決手段】励起光L1の照射により被写体Sの観察部位から発せられる蛍光L2の観察像と、照明光L1による被写体像とを共に撮影する撮像装置であって、開口絞り10を備える。開口絞り10は、フィルタ部が形成された絞り羽根部材を複数備え、複数の絞り羽根部材のフィルタ部から形成されたフィルタ領域と該フィルタ領域の内側に位置する開口領域とを有し、フィルタ領域が、蛍光L2に対応する波長域の光を透過させ、照明光L1に対応する波長域の光の透過を低減又は遮断し、開口領域が、蛍光L2に対応する波長域の光と、照明光L1に対応する波長域の光を透過させる。開口絞り10の取付位置での光路の最大域において、蛍光L2に対応する波長域の光が絞られず、開口領域の面積が可変である。【選択図】図9
