Anyone who has used a laser marking machine or has been in contact with a laser marking machine knows that when using this kind of equipment, it will involve the problem of correct adjustment of the focal length plane. Equipment manufacturers will emphasize the importance of focal length when equipment is installed, trained, and adjusted. Laser engraving on the correct focal length plane is the key factor for the equipment to perform normally. Many direct users of equipment have questions about how to correctly adjust laser marking equipment The confusion and misunderstanding of the focal length. Today, I will summarize some conventional laser marking machine focal length debugging methods.
First of all, before understanding the correct debugging method, we are here to popularize and understand the correct definition of focal length:
Focal length, also known as focal length, is a measure of the concentration or divergence of light in an optical system, and refers to the distance from the center of the lens to the focus of light concentration.
Next, let's list a few conventional methods of finding the focal length:
1. Continuous luminescence test method.
The marking paint software is about one centimeter square or round, after regular filling, the laser energy is transferred to the set parameter column, the frequency of use is larger, and then the continuous marking is checked, and a metal laser projection position is placed on the product surface to block obstacles, such as Continuous cursor, shaking Z-axis movement, until the most powerful metal business card energy laser, the clearest sound, the brightest color, basically the focal length, resulting in several times more tests to find the appropriate focal length. This method is suitable for 1064nm wavelength fiber laser marking machine, semiconductor laser marking machine, end pump laser marking machine, 355nm laser marking machine, uv 532nm green laser marking machine, etc. Carbon dioxide laser marking machine can find a A piece of white paper, and then draw a box in the marking software, the continuous light shakes the Z axis, and the focal plane is the finest when the paper is printed on the line.
2. Measure the focal length.
After the equipment manufacturer notifies the current equipment focal length data, it can be recorded, and then after each product switch. You can point the end of the ruler directly at the surface of the product. The scale value refers to some reference surface on the field lens, which is dithered up and down to scale the data. This method is suitable for all laser marking machines, but the disadvantage is that if the position of the laser engraved product is concave or the steel ruler is not suitable, this method is not very practical.
3. Double red light value method.
This method requires the device to have this hardware configuration at the factory. Mount one or two slanted red rays next to the galvanometer or galvanometer and use the principle of a right triangle to find the other right side of the focal plane by using a fixed right side and two overlapping hypotenuses. Focus distance can be found quickly by simply shaking it up and down until the two red indicators coincide. Although this method is convenient and quick, it requires the equipment manufacturer to cooperate with the secondary equipment. Also, if adjusted poorly or with an intermediate shift, it’s easy to mislead and create the wrong focal length surface
conclusion
To sum up, there are three ways to find the focus of the fiber laser marking machine. As long as the operator is proficient in these three methods, finding the focus becomes very simple. After finding the focus, be sure to use a ruler to measure the distance from the lower galvanometer to the focus. Then we can record this distance as a reference for the next marking. So we don’t have to test focus again.