What is focal length? The focal length is the distance from the center of the lens to the focus of the light gathering when the parallel light is incident. In a simple way, the focal length is the distance from the focus to the center of the mirror. Here's how:
The first method: continuous light test
Draw a square or round shape about one centimeter on the marking software, fill it with regular filling, adjust the laser energy to a larger value in the laser setting parameter column, use the low frequency as much as possible, check the continuous marking, place a metal business card and other obstructions at the laser projection position on the product surface, continuously mark with light, shake the y-axis up and down until the laser acts on the metal When the card has the strongest energy, the clearest sound and the brightest color, it is basically the focal length. Test it several times over and under to find the right focal length.
After we find the focal length, we can use a ruler to measure the distance between the down vibrating lens and the object surface. Use this distance as a fixed value. The next time marking the same object, just take out a ruler to make the height of the galvanometer to the object surface reach this value again.
The second method: red light point to point method
It can be located by configuring additional red light. This method requires that the equipment itself has this hardware configuration. Add one or two oblique red light beside the galvanometer or galvanometer. Use some principles of right triangle, use a fixed right angle edge and two coincident inclined edges to find another right angle edge of the focus plane. Just shake up and down until the two red indicator points coincide to quickly find the focal length. Although this method is convenient and fast, it needs the equipment to have this device. leapion
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