Patent ID: 7705326
Filing Date: 2010-04-27
Classification: A61B,G01N,G02B

Abstract:
1. An apparatus for fluorescence observation comprising: an excitation filter which transmits only exciting light of a specific wavelength out of illumination light; and an absorption filter which blocks the exciting light and transmits only fluorescence generated from a specimen irradiated with the exciting light, wherein at least one of the excitation filter and the absorption filter includes a multilayer film having 90 or more layers, wherein an interval between a half-value wavelength of the excitation filter on a long-wavelength side and a half-value wavelength of the absorption filter on a short-wavelength side is in a width between 1 nm to 6 nm, and wherein change of the half-value wavelengths of the excitation filter and the absorption filter in accordance with humidity change from 10% to 95% is 0.5 nm or less.