| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical device capable of easily holding a prism at a low cost and also holding it in the state of being excellent in impact resistance.SOLUTION: The optical device including a reticle 5 is provided with: a prism presser 6 for pressing a part of a prism 3; a prism box 2 for holding the other part of the prism 3 on one end side and holding the reticle 5 on the other end side; and a lens barrel 8 for housing, in the inside, the prism presser 6, the prism 3, the prism box 2 and the reticle 5. A screw part 6a of the prism presser 6 and a screw part of an extension part of the prism box 2 are engaged, and the prism box 2 is abutted to a step part 8b of an inner peripheral surface of the lens barrel 8. Further, a screw part 7a of a pressing ring 7 and a screw part 8a of the lens barrel 8 are engaged, a tapered part 2a on the other end side of the prism box 2 and a tapered part 7b of the pressing ring 7 are engaged, and the prism box 2 is held between the lens barrel 8 and the pressing ring 7. |
