Patent ID: 8169470

Claim:
An optical imaging device comprising: a light source in a light source device for emitting light including excitation light and light in at least a part of the visible light band; an insertion section that can be inserted into a body cavity; an excitation light filter in the light source device having a passband which is a band of the excitation light that is irradiated to a subject in the light from the light source; a light transmission section, which is provided at the insertion section and guides light that has passed the excitation light filter to a subject in the body cavity; a light receiving optical system, which is provided at a distal portion of the insertion section and receives return light from the subject, of the light guided to the subject by the light transmission section; a fluorescent image capturing section for acquiring a fluorescent image related to fluorescence in the return light received by the light receiving optical system; and an illumination light filter section including an optical thin film formed on a surface of at least one element of elements constituting the light transmission section for decreasing at least light in a band overlapping with the band of light for which the image is captured by the fluorescent image capturing section, from fluorescent light or Raman scattering light generated in a light path of the light transmission section by light transmitted by the light transmission section and guided to the subject, wherein a maximum optical density value of the illumination light filter section in a wavelength band blocked thereby is lower than a maximum optical density value of the excitation light filter in a wavelength band blocked thereby.