| 摘要 |
PURPOSE: To adjust the direction of the optical axis of an eyepiece system so as to be the direction easy to observe even when the direction of the optical axis of an objective system is changed in the vertical plane by providing a lens barrel part, an eyepiece part, a reflection surface member, a halfangle rotating mechanism and an attaching/detaching means. CONSTITUTION: A reflection surface member 30 makes a mirror surface coincide with a rotation value RA to the lens barrel part 10 of the lens barrel part 20 of an eyepiece system, is rotatably provided about a rotary shaft RA and reflects the image forming light beam by the lens barrel part 10 toward the eyepiece lens of the lens barrel part 20 of an eyepiece system. A half-angle rotating mechanism 50 rotates the reflection surface member 30 to the lens barrel part 10 by an angleα/2 when a eyepiece part (composed of a casing 152 and the lens barrel part 10 of the lens barrel part 20) is rotated to the lens barrel part 10 by an angleα. An attaching/detaching means attaches and detaches the eyepiece part to and from the lens barrel part so as to become a fixed state and a freely rotatable state. When the direction of the eyepiece part is changed, the mirror surface of the reflection surface member 30 is rotated to the lens barrel part 10 in the same direction as that of the eyepiece part by the angleα/2 in accordance with the rotating angleαof the eyepiece part.
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