• How to Choose a Field Mirror?

In laser marking machines, the field mirror has a significant impact on marking effects and efficiency. The choice of field mirror depends on several factors, including marking area, marking depth, marking precision, and marking speed. Here are some influences of the field mirror on engraving effects:

1. Marking area: The size of the workpiece determines the required field mirror area. The larger the area, the longer the focal length of the field mirror, which will affect the maximum processable material height, as the height of the machine column is fixed.

2. Focus spot size: The longer the focal length of the field mirror, the larger the focused spot diameter is usually. A larger spot may lead to less precise marking, especially when high-resolution marking is required.

3. Marking depth: A field mirror with a longer focal length may reduce the marking depth because the focused spot becomes larger, reducing the energy density per unit area. If a deeper engraving effect is needed, a field mirror with a shorter focal length may be required.

4. Marking precision: For applications that require high-precision marking, a field mirror with a shorter focal length can usually provide a smaller focused spot, thus achieving a more refined engraving effect.

5. Power density: The length of the field mirror's focal length affects power density (power/area). The longer the focal length, the lower the power density, which may require a higher laser power to achieve the same engraving effect.

Therefore, when changing to a field mirror with a larger area, it is necessary to consider the above factors comprehensively and not change them arbitrarily.

• What changes need to be made after changing the field mirror?

After changing the field mirror, the following things need to be done:

1. Confirm the focal length: The larger the area, the longer the focal length. According to the parameters of the field mirror, adjust the correct focal length. Remember the correct distance to facilitate subsequent processing of materials of different thicknesses.

2. Modify software parameters: It is necessary to modify the software's working area, field mirror parameters, and galvanometer parameters.

The galvanometer parameters need to be determined through calibration software (Corfile2) testing, and you can refer to the video test：

https://www.youtube.com/watch?v=llflAf0G62Q&t=388s

3. Test marking effects: After changing the field mirror, it is necessary to re-test the correct marking parameters, including speed, power, frequency, resolution, etc.