List a few ways to find the focal length

The first type: continuous light test method.

Draw a square or circle of about one centimeter on the marking software. After regular filling, adjust the laser energy to a larger value in the laser setting parameter column, use the low frequency as much as possible, and then check the continuous marking to laser projection on the product surface. Position a metal business card and other obstructions, continuous light marking, shaking the Z axis up and down, until the laser is applied to the metal business card, the energy is the strongest, the sound is the most crisp, the color is the brightest, basically the focal length, over the past Test multiple times and find the right focal length. This method is more suitable for 1064nm wavelength fiber laser marking machine, semiconductor laser marking machine, end pump laser marking machine, 355nm ultraviolet laser marking machine, 532nm green laser marking machine, etc., carbon dioxide laser marking The machine can find a blank sheet of paper, then draw a box in the marking software, and continuously emit the light to shake the Z-axis. When the line on the paper is the thinnest, it is the focal length surface.Second: measuring the focal length method.

After the equipment manufacturer informs the current equipment's focal length data, it can be recorded and then switched after each product. You can use a steel ruler directly on the surface of the product. The scale value refers to a reference surface on the field lens, and can be shaken up and down to the scale data. This method is applicable to all laser marking machines, but one drawback is that this method is not practical if the position of the product requiring laser engraving is concave or improperly inserted into the steel ruler.

The third type: double red light point value method.

This method requires the hardware configuration of the device itself when it leaves the factory. Add one or two oblique red lights next to the galvanometer or galvanometer. Using some principles of a right triangle, use a fixed right angle edge and two coincident Beveled edge, find another right-angled side of the face where the focal length is located. You only need to shake up and down until the two red light points coincide to find the focal length quickly. Although this method is convenient and quick, it is necessary for the equipment manufacturer to cooperate with the secondary device, and if it is not adjusted or shifted in the middle, it is easy to cause misleading and form a wrong focal length surface.