Patent ID: 7088504

Claim:
A surgical microscope, comprising: a first housing, having an opening; an objective optical system comprising an objective lens provided in the first housing, and a pair of relay lenses that are provided in the first housing and form first binocular luminous fluxes on the basis of a luminous flux incident through the objective lens; a first binocular eyepiece optical system, provided in the first housing, and forming a first binocular optical image through the incidence of the first binocular luminous fluxes; a splitting optical system, provided in the first housing, for splitting the first binocular luminous fluxes formed by the pair of relay lenses and thereby forming a plurality of split luminous fluxes including second binocular luminous fluxes that can exit at least through the opening; a pupil splitting optical system, provided in the first housing, disposed at a pupil location substantially conjugate to the entrance pupil of the objective optical system, for splitting at least one of the plurality of split luminous fluxes so as to split the luminous flux at the pupil location, and thereby forming third binocular luminous fluxes and enabling the third binocular luminous fluxes to exit through the opening; a second housing, attached to the opening, and capable of being set to at least first and second rotational angles with respect to an axis parallel to the travel direction of the second binocular luminous fluxes exiting through the opening; and a second binocular eyepiece optical system, provided in the second housing, forming a second binocular optical image on the basis of the second binocular luminous fluxes through the incidence of the second binocular luminous fluxes when the second housing is set to the first rotational angle, and forming a second binocular optical image on the basis of the third binocular luminous fluxes through the incidence of the third binocular luminous fluxes when the second housing is set to the second rotational angle.