Patent ID: 7050224
Filing Date: 2006-05-23
Classification: G02B

Abstract:
1. A fluorescence observing apparatus, having: an excitation filter unit for transmitting only exciting light with particular wavelengths, of illuminating light; and an absorption filter unit for transmitting only fluorescent light produced from a specimen by irradiating the specimen with the exciting light to block the exciting light, wherein a space between a half-value wavelength on a long-wavelength side of the excitation filter unit and a half-value wavelength on a short-wavelength side of the absorption filter unit is in a range of 6–12 nm, wherein the excitation filter unit has an ultraviolet cutoff filter formed on a base plate, and wherein variations in half-value wavelengths of the excitation filter unit and the absorption filter unit where humidity is changed from 10% to 95% are within 0.5 nm.