US12529542 - Optical sighting device
An optical sighting device 10 used by being installed to a firearm includes: an objective system part 12 , forming an inverted image of a target object on a first focal plane; and an erect system part 14 , forming an erect image obtained by reversing the inverted image on a second focal plane. The erect system 14 has: lenses 112 to 116 arranged between the first focal plane and the second focal plane; and a movable cylinder 134 as an erect system cylinder holding the lenses 112 to 116 . The adjustment mechanism 20 is a mechanism for adjusting tilting of an axial direction of the movable cylinder, and has: an advancing-retracting shaft 204 as an advancing-retracting member advancing and retracting on an end side of the movable cylinder 134 ; and a spring 206 as a double torsion spring biasing the movable cylinder 134 toward the advancing-retracting shaft 204.
