| 摘要 |
A focus adjustment mechanism for a telescopic rifle sight includes a rotatable cam hub including a drive face and a spiral cam track formed in the drive face around an axis of rotation. An actuator slide of the adjustment mechanism is slidably mounted to a housing of the telescopic rifle sight for movement along a longitudinal axis of the housing. The actuator slide includes a cam follower that is operably engaged in the spiral cam track so that the actuator slide moves generally along the longitudinal axis in response to rotation of the cam hub to changing a setting of the adjustment mechanism. The actuator slide is operatively connected to a movable optical element positioned within the housing of the telescopic rifle sight to drive the optical element in response to rotation of the cam hub. The rate of linear movement of the optical element relative to the rate of rotation of the cam hub is controlled by the shape and arcuate angle of the spiral cam track. A spring biases the actuator slide relative to the housing to prevent rifle recoil from inducing changes to the setting of the adjustment mechanism.
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