Causes of uneven marking effect of uv pulsed laser marking machine

 1. Use off-focus to mark a certain range of content

Because each focusing lens has a corresponding focal depth range, and the use of off-focus method will easily lead to a large-scale marking pattern, the edge is at the focal depth critical point or exceeds the focal depth range, which is easier to cause ineffective results. Uniformity. Therefore, the off-focus marking method must consider the problem of laser energy.

2. The laser output spot is blocked, that is, after the laser beam passes through the galvanometer and field lens, the spot is missing and not round enough

The laser output head, fixing fixture and galvanometer are not adjusted properly, which causes part of the laser spot to be blocked when the laser passes through the galvanometer. After the field lens is focused, the spot on the frequency doubler is non-circular. Evenly.　　

There is another situation, that is, the deflection lens of the galvanometer is damaged. When the laser beam passes through the damaged area of ​​the lens, it cannot be reflected out well. Therefore, the laser energy of the laser beam passing through the damaged area of ​​the lens is inconsistent with the laser energy of the non-damaged area of ​​the lens, and the final laser energy acting on the material is also different, which makes the marking effect uneven.

 3. Thermal lens phenomenon

When the laser passes through the optical lens (refraction, reflection), the lens will generate heat and produce slight deformation. This kind of deformation will increase the focus of the laser and shorten the focal length. If the machine is fixed and the distance is adjusted to the focal point, after a period of time after the laser is turned on, the energy density of the laser acting on the material will change due to the thermal lens phenomenon, resulting in uneven marking effect.　

4. The machine level is not adjusted properly, that is, the laser vibrator lens or field lens lens is not parallel to the processing table

두 개가 수평이 아니기 때문에 필드 렌즈를 통과한 후 레이저 빔과 처리 대상물 사이의 거리가 일치하지 않습니다. 결국 처리된 물체에 떨어지는 레이저 빔의 에너지는 일정하지 않은 에너지 밀도를 갖게 되어 재료에 영향을 미칩니다. 고르지 않은.　

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5. 재료 표면의 도막두께 불일치 또는 물리화학적 성질의 변화 등 재료의 사유

재료는 레이저 에너지에 민감합니다. 일반적으로 레이저 에너지가 동일한 재료 아래에서 재료의 파괴 ​​임계값에 도달하는 것은 확실합니다. 재료 코팅의 두께가 균일하지 않거나 다른 물리적 및 화학적 처리 공정이 균일하지 않은 경우 레이저 마킹 후 효과도 고르지 않습니다.