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Classification and main parameters of laser marking airport mirrors
In the market supply, most of the field mirrors used in the current market are 1064nm and 1060nm. But with the development of lasers in the future, 532nm, 355nm and 266nm field mirrors will also have corresponding applications. The field lens of the laser marking machine is generally 100X100, 200X200, 300X300, and these three are the most commonly used.
The main technical parameters of the field lens
The function of the field lens is the marking range of the laser marking machine, the marking range The larger it is, the less refined it is. The field mirror is also divided into single-layer mirror and double-layer mirror. The single-layer mirror is used for CO2 laser marking machine, and the double-layer mirror is used for fiber laser marking machine.
1. Scanning range: The larger the area the lens can scan, the more popular it is for users. But if you blindly increase the scanning area, it will bring a lot of problems. For example, the light spot becomes thicker, the distortion increases, and so on.
2. The focal length (it has a certain relationship with the working distance, but is not equal to the working distance).
a. The scanning range is proportional to the focal length of the field lens—the increase in the scanning range will inevitably lead to an increase in the working distance. The lengthening of the working distance will inevitably lead to the loss of laser energy.
b. The diameter of the focused spot is proportional to the focal length. This means that when the scanning area reaches a certain level, the diameter of the obtained spot is very large, that is to say, the spot size is not fine enough, and the power density of the laser decreases very fast (the power density is inversely proportional to the square of the spot diameter). Conducive to processing.
c. Since the F-Theta field lens uses the relationship of y’u003df*θ to work, the actual values u200bu200bof θ and tgθ are still different. And as the focal length f increases, the degree of distortion will become larger and larger.
Then how do we distinguish the quality of laser marking airport mirror, mainly depends on its transmittance and surface smoothness and whether the mirror light rate is uniform, you can Try different field lenses with the same parameters on the machine, and fill in a large range to distinguish them. Each lens has a fixed focal length. When buying a laser marking machine, it is still based on your own products. and marking requirements to select the appropriate field lens, generally the larger the field lens, the higher the price!
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