| 摘要 |
A riflescope including means for correcting the ballistic trajectory corresponding to the bullets being used. A magnification alteration ring drives a zoom lens system by a rotatable cam cylinder. An axially slidable cam member is coaxially rotatably mounted on the cam cylinder and in cammed engagement with said magnification alteration ring for effecting axial sliding thereof in accordance with the rotation of the magnification alteration ring, and the cam member is prevented from rotating during axial sliding thereof. The cam member has a plurality of sloped surfaces on the outer face thereof extending in a direction parallel to the axis of the cam member, one sloped surface for each different type of bullet to be used, and the sloped surfaces being adjacent the free end of the lens tube holding the zoom lens system. A changeover ring is rotatably mounted on the outside of the riflescope tube for stepwise rotation therearound and engaged with the cam member for effecting stepwise rotation of the cam member. A finely adjustable stopper member on the riflescope tube is engaged with the respective sloped surfaces as the cam member is rotated, and a resilient member is engaged with and biases the free end of the lens tube against the stopper member. Each of the sloped surfaces has a shape for minutely axially tilting the lens tube, and thus the line of sight of the riflescope, for correcting the virtual ballistic trajectory for the type of bullet corresponding to the respective sloped surface in accordance with the position of the zoom lens system.
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