| 摘要 |
PURPOSE:To always set the optical axis of an objective lens to a certain position by supporting the eyepiece lens side of each lens-barrel on the optical axis of the objective lens through a bearing plate by a coupling member so that the lens-barrel is turned around the optical axis of the objective lens. CONSTITUTION:A lens-barrel 6 is freely turnably supported in a holding hole 2 so that an optical axis l of the objective lens coincides with an axial line (k) of the holding hole 2. The eyepiece lens-side end face placed on the optical axis l of an objective lens storage part 6b is pierced by a reception hole 8. A bearing plate 11 provided with a reception hole 10a which cooperates the reception hole 8 to freely rotatably support a ball 9 has through holes 12a-12d positioned correspondingly to tapped holes 4a-4d of a coupling part 1 and is fixed to the coupling part 1 by a screw 13 to support the lens-barrel 6 by the coupling member 1 freely rotatably around the optical axis l of the objective lens. Thus, respective optical axes of objective lenses are only rotated in the same positions and the distance between optical axes is not changed though the distance between respective optical axes of eyepiece lenses is changed for the purpose of adjusting the width between eyes.
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