| 摘要 |
A binocular instrument according to the present invention basically comprises a binocular instrument body, a left-hand lens barrel supported by a supporting frame, a high-hand lens barrel supported by the body, a left-hand armor slidable in a pupil distance (distance between optical axis) adjusting direction and a right-hand armor fixed to the body. When the binocular instrument is switched from a non-using state to a using state, the left-hand armor is slid in the left direction, so that only the left-hand armor moves while the supporting frame is in the fixed condition, and the lenses are set at an open condition, thereby permitting the use of the binocular instrument. Thereafter, when the left-hand armor is slid in the same direction, the supporting frame is shifted together so that a pupil distance maximizing position is reached. According to this binocular instrument, not only the operation for switching the lenses to a sheltering state and an open state becomes simple, but also handling becomes easy, and even the structure becomes simple.
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