Operating microscope

An operating microscope comprising:

• an objective lens on which a light flux from an observation target is made incident;
• a variable magnification lens system on which a light flux from the objective lens is made incident and which varies an observing magnification of the observation target;
• an observing part for observing an optical image formed on the basis of a light flux from the variable magnification lens system;
• an illuminating optical system disposed in a space between the objective lens and the observation target and capable of irradiating illuminating light onto the observation target;
• and
• a varying mechanism for varying a relative position between at least a part of the illuminating optical system and an optical axis of the objective lens.

An operating microscope comprising:

• an objective lens on which a light flux from an observation target is made incident;
• a variable magnification lens system on which a light flux from the objective lens is made incident and which varies an observing magnification of the observation target;
• an observing part for observing an optical image formed on the basis of a light flux from the variable magnification lens system;
• an illuminating optical system at least partially disposed in a space between the objective lens and the observation target and capable of irradiating illuminating light onto the observation target;
• and
• a varying mechanism for varying at least one of an exit position and exit direction of the illuminating light from the illuminating optical system such that the illuminating light is at least partially incident on the observation target regardless of a variation in the observing magnification.

An operating microscope comprising:

• an observing optical system for observing an observation target, the observing optical system having observing magnification capable of being varied;
• an illuminating optical system for irradiating illuminating light onto the observation target from a position outside the observing optical system, an exit position of the illuminating light being capable of being varied;
• and
• a system for correlating a variation of the observing magnification of the observing optical system with a corresponding variation of the exit position of the illuminating light of the illuminating optical system.

A method of irradiating illuminating light in an operating microscope, the method comprising:

• irradiating illuminating light onto an observation target when a variable magnification observing optical system is set for one of a high magnification and low magnification;
• varying the variable magnification observing optical system to another of the high magnification and low magnification observation;
• and
• changing at least one of a exit position and exit direction of the illuminating light such that the illuminating light remains incident on the observation target regardless of the variation in the magnification observing optical system.