PROBLEM TO BE SOLVED: To provide an illumination structure for surgical microscopes which provides necessary light volume over an entire focal position range even when a variable range of focal length of an objective optical system is expanded.SOLUTION: When a movable lens 8 moves causing change in focal length, a sloped surface 27 of a cam member 26 that integrally moves with the movable lens 8 is in contact with a top end 25 of a lever 24, causing an angle of a mirror 21 to change such that illumination light R reflected by the mirror 21 is directed to a focal position. Thus, the illumination light R is always directed to a focal position.SELECTED DRAWING: Figure 5COPYRIGHT: (C)2018,JPO&INPIT【課題】対物光学系の焦点距離の可変範囲が拡大されても、全ての焦点位置において必要な光量が得られる手術顕微鏡の照明構造を提供する。【解決手段】可動レンズ8が移動して焦点距離が変動しても、可動レンズ8と一体的に移動するカム部材26の傾斜面27がレバー24の上端25に当接して、ミラー21で反射された照明光Rが焦点位置に向かうようにミラー21の角度を変更させるため、照明光Rは常に焦点位置に向けて照射される。【選択図】図5
