1. For certain marking area focus-offset may works better
Each focusing lens has a corresponding focus range. With while defocusing can easily lead to a large range of marking patterns, the edge is at the critical depth point or exceeds the depth of focus range, so it is easier to cause the effect Uniformity. Therefore, the off-focus marking method must consider the laser energy.
2. Laser Spot deficiency- not round
2.1 Malposition of optical output head, fixture and the scanner. Any malposition of these parts will cause laser beam out of shape and then uneven marking effect.
2.2 Damage of deflection lens in galvanometer-it could not be fully reflected when laser beam goes through the defective area in lens in galvanometer. therefore, the energy differs with defective area and area in good.
3. Thermal Effect Phenomenon
The heat caused from refection and refringence leads to tiny deformation in mirror. The deformation makes upper laser beam focal position and shorter focal distance. Accordingly, energy density changes result in uneven marking effect.
4. Horizontal level of workbench
Once the workbench is out-of-level, the laser beam comes from field len will reach workpiece surface in different distance that’s different marking energy on workpiece surface. Hence, the marking effect is uneven.
5. The material itself influence the marking effect
-the thickness of film on surface or chemical &physical changes
Material is very sensitive to laser energy with certain damage threshold value. The layer thickness, or even the chemical and physical processing does not reaching uniformity will influence marking effect.
Having more marking effect questions or problems? Reach us via info@emcounts.com or call +86 13291183568.
