The lens of the red dot sight shows a parabolic structure, similar to a concave-convex lens. There is a coating on the lens, which can reflect specific light waves. The common ones are red and green visible light, and of course natural light imaging Aiming is also possible.
Compared with the horizontal plane, adjusting the angle of the lens can make the reflected light of the light source reach the level. At this time, the refracted light from the target point can form a roughly parallel state with the reflected light, and the light spot on the lens is shown to coincide with the target point. , This is the secret that your eyes can aim at the target no matter how you move.
The light source is very simple, LED bulbs are fine, usually red and green lights are used alternately. The position of the light source is about 60 mm away from the lens, and of course there are other sizes.
If you don’t know the location of the light source, you can only use the “focusing” method and try slowly. When you move your eyes, the red dot on the lens basically coincides with the target point, even if the focus is OK.
The cross-shaped and triangular aiming patterns that appear on the lens are printed on the reticle. Generally, holes are dug in the metal sheet of a few tenths of a millimeter, so that the light passes through the reticle to reflect the pattern on the lens. . The processing of the reticle requires a high-precision instrument, such as a laser engraving machine, so it is very difficult to make. Laoyang gave up, if you are interested, you can try it.
Do not make the light source too large, otherwise it will affect the aiming effect. If the light is too dazzling, consider using paper partitions. I use a 3D printed lamp cover, drill a small hole in the lamp cover to leak light, the diameter of the small hole is preferably less than 1 mm, the best effect.
