Circuit controls intensity of reflex optical sights

摘要

Apopular categoryof aiming/pointing aids is the reflex, or "red-dot," sight. This system finds use in such diverse applications as astronomy, archery, and shooting. In the reflex sight, light from an internal source-typically a high-intensity red LED-reflects from a curved, transparent optical (reflex) element through which you view the target. The result of this geometry is that the image of the LED (the red dot) appears superimposed on the target image, thus indicating the point of aim. When you correctly adjust the aiming point of the telescope, bow, or gun, the target and LED images coincide. The reflex sight offers several advantages over competing pointing technologies, such as telescopic and open sights. These benefits include rapid and intuitive target acquisition, noncritical eye positioning, and a wide field of view.