| 摘要 |
In order to improve the operability concerning observation and manipulation by reducing the distance from the sample surface up to the eye-point of the observer, the binocular tube which is capable of being altered of its angle of inclination comprises a stationary tube unit, a movable tube unit rotatably secured to the stationary tube unit, an ocular tube unit rotatably mounted on the movable tube unit, first deflector means deflecting once the light beam advancing toward the ocular tube unit backwardly along its initial course of travel, the first deflector means being disposed in the optical path at a point between the ocular tube and the object being observed, and second deflector means for deflecting the light beam emitting from the first deflector means to advance along the optical axis of the ocular tube unit.
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