Patent ID: 8419633

Claim:
A light source apparatus that can supply illuminating light for normal light imaging and special light imaging, comprising: a light source section that generates wideband light; a first rotational filter section that can place a first filter that passes light of a first wavelength band, a second filter that passes light of a second wavelength band having a longer wavelength than the first wavelength band or a third filter that passes light of a third wavelength band having a longer wavelength than the second wavelength band and light of the first wavelength band in a light path of the wideband light generated by the light source section; a second rotational filter section that can place a fourth filter that passes light of the second wavelength band and light of the third wavelength band in the light path; and a band selection filter section that can place a band limiting filter that limits light of the first wavelength band and light of the second wavelength band to a narrow band and intercepts light of the third wavelength band in the light path, wherein in a case of the normal light imaging, the first rotational filter section and the second rotational filter section are controllable so that the fourth filter is placed in the light path when the third filter is placed in the light path, and in a case of the special light imaging, the band limiting filter is placed in the light path and the first rotational filter section and the second rotational filter section are controllable so that the fourth filter is placed in the light path when the second filter is placed in the light path.