How to choose the right field lens for laser marking machine

When customers buy a marking machine, they do not know how much field lens to use. Laser editor popularize it: How to choose a suitable field lens for a laser marking machine.

1. For the wavelength, the laser marking machine for non-metallic materials is generally 10.6 microns, which is the field lens of the carbon dioxide laser marking machine; while the laser marking machine for semiconductor materials and the fiber laser The marking machine, that is, the equipment that mainly plays metal, has a wavelength of 1064nm; while the laser engraving machine, the laser marking machine of the green laser, has a field mirror of 532nm wavelength; the ultraviolet laser marking field mirror has a wavelength of 565nm. So know what kind of laser generator marking machine we are, and choose what kind of wavelength field lens;

2. For the field lens size and lens focal length, some customers say, I want to buy the Z largest marking The field lens of the format can be used for different sizes of products, and the application field is wider, so as to prevent the development of new products and the need to increase equipment later, if the size of the field lens is increased, the focus spot will increase, and the distortion will also increase. , the focal length of the field lens lens, that is, the working distance from the bright side of the lens to the product should also increase. These changes will cause the marking effect to be not detailed enough, the consumption of laser energy, and there is no small-format lens to mark clearly. In addition, the shorter the focal length of the lens, the smaller the focal depth, and the higher the requirements for the flatness of the surface of the object to be marked, so the surface of the object with fluctuation or cylindrical arc is not suitable for the field lens with a short focal length of the lens. hit. As mentioned earlier, the longer the focal length of the lens, the smaller the energy density of the focus point will be, and the lighter the marking will be, so we should pay attention to choosing a laser generator with a larger output power and its supporting facilities. Therefore, customers must use the most suitable field lens according to different processing areas and product shapes, or reserve several field lenses with different scanning ranges. Of course, when replacing the field lens, the general equipment software requires re-optical correction. These manufacturers will provide Corrected; 3. For the spot, the galvanometer of the general fiber marking machine is generally 10 spots, then our field mirror chooses 10 spots. However, some customers buy field mirrors for galvanometer welding machines. As we all know, the galvanometers of welding machines generally have large spots, such as 20 spots, 25 spots, 30 spots, 36 spots, etc., then we use The field mirror also needs to be accompanied by facilities. The domestic galvanometer type welding machine has such and other problems, most of which are caused by the inability to find a field mirror with a large spot. The field lens with a small spot will burn out suddenly when it bears the power of the welding machine; 4. For the installation of the field lens, the field lens is screwed under the galvanometer, so the external thread of our field lens must be Suitable for your own galvanometer. The external thread of the galvanometer generally has several types of M85*1, M102*1, M*1, M58*1, M55*1, etc. The most common one is M85*1, the external thread socket of the imported scanlab galvanometer It is M79*1. Then we can use the matching facilities with the galvanometer. If you can't find the corresponding external thread field lens, you can just get an external thread conversion ring. Generally, the manufacturer of the marking machine cabinet has spare parts.

For today, which has higher requirements for the speed of laser marking machines and better marking quality, the anti-interference ability of galvanometer signals is also higher, so the current use Digital galvanometer, what is a digital galvanometer? A digital galvanometer is the way the galvanometer driver board receives digital signals. Generally, it is an 8-wire system, and this kind of signal has much stronger anti-interference ability during transmission. The signal to the galvanometer driver card is the marking card. There is generally a long distance between the marking card of the fiber laser marking machine and the galvanometer driver card, generally about 2 meters. The possibility of the analog signal being interfered is much higher, and if the high-speed motor is a little bit of interference, the interference to the accuracy and speed of the galvanometer will be fatal. The digital galvanometer is improved in the control of the galvanometer driver card, and the DA card (digital to analog) originally on the control board of the marking card has been integrated into the galvanometer driver card. In the distance from the galvanometer signal of the marking card to the galvanometer drive card of the carbon dioxide laser marking machine, the signal is transmitted as a digital signal. The advantage of this is that the transmission distance can be longer, and the anti-interference ability It is more powerful and the control precision is more accurate.

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