2D代码标记

2D code application examples

使用2D代码可简化管理，提高准确性并降低人工时间。近年来，已完成成品零件及其单个组件的详细可追溯性。直接用激光标记标记的2D代码的数量正在增加。因此，需要高质量的标记以确保稳定的2D代码读数是可能的。

Electronic Device Industry

Automotive Industry

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2D code grading

是很重要的创建很容易再保险的标志ad by 2D code readers in order to ensure stable reading. There are some standards for 2D code reading that can be used as a marking guide. Ease of reading can be expressed in grades. A standard called ISO/IEC TR 29158 (AIM DPM-1-2006)* is generally used to judge direct marking on products with laser markers. This standard specifies the following criteria for the evaluation of reading grades.

这是2D代码标记直接零件标记质量评估的国际标准。

当直接标记金属表面时，当无法获得对比度时，CC，CM，RM和FTP通常会较低。保持这些值很高是确保可读标记的目标。最近，C等级已成为行业标准，许多公司在标记后立即试图对代码进行分级。

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高对比度标记

准确地读取/分级2D代码需要黑色和白色细胞之间的高对比度。激光标记可以根据标记参数在金属上产生黑白标记。

1.黑色退火标记

Lasers create black marks on metal by oxidizing (burning it) or annealing it (using heat to create a black film).

2. White etching marking

激光通过蚀刻表面在金属上创建白色标记。这会导致不规则的光反射，从而使标记看起来为白色。

对比对于2D代码标记很重要。3D校正是维持整个区域的有效方法。

Ideal marking is possible at the center of most marking areas without any problems. However, lasers that don't have 3-Axis marking may find it difficult to create a clear contrast between black and white towards the outer edges of the marking field, resulting in lower grades.

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Depth of focus

A laser beam has a depth of focus. When the focus deviates, the quality of marking degrades and this also affects 2D code reading.

2D code grade changes in accordance with focal distances

As a target moves further away from a laser's focal point, it becomes nearly impossible for the laser to create any contrast. Although a laser's depth-of-focus varies depending on the oscillation method, it is necessary to prevent the focus from deviating too much. This can be accomplished by an external displacement sensor or a built-in autofocus.

激光振荡法和重点深度

右侧的图比较了YVO之间的标记质量₄激光和纤维激光器。一个YVO₄激光produces a beam with a high peak power and a short pulse. This allows the laser to irradiate parts with ideal strength and high energy density over short time. Even when the focus deviates (due to movement of targets or product tolerance), a YVO₄激光's marking quality is stable compared to fiber types. For cases where the marking is affected by an incident angle (such as at the edge of a marking area), a YVO₄激光achieves stable marking quality without fading.

Keyence's MD-X Series combines the power of fiber and the quality of YVO₄通过独特的振荡方法一起。

Auto-focus function

KEYENCE'sMD-X2系列激光标记具有内置距离传感器，可以自动对焦到标记字段中的任何位置，而无需外部设备。结果，它能够保持具有尺寸公差的目标的高标记质量。此外，当更改产品类型时，无需停机，因为可以对激光进行编程以自动容纳。这大大降低了劳动力小时，简化了设施并提高了生产力。

Measurement may not be possible depending on the material, shape, or surface condition of the target.

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Marking patterns

KEYENCE laser markers provide several 2D code marking patterns that are optimized for different marking types. The following examples show how much difference a pattern change can make.

Selectable from various marking patterns

Clear 2D code marking

With some targets, reading may be unstable due to the influence of hairline metal surfaces. Just changing the marking pattern of a 2D code or base may improve the reading rate.

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Fastest 2D code marking

根据所需的生产量，标记时间可能受到限制。选择最佳标记模式可实现较短的标记时间并提高生产率。

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  Standard marking that marks cells one by one from left to right

  Marking time: 637 ms

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  有效的模式，将整个2D代码标记为一句话

  标记时间：342毫秒
  传统方法减少了47％

The time was calculated with a marking example of 16 × 16 DataMatrix with cell size of 0.3 mm (0.01"). The evaluation above is a typical case. The result varies depending on the material and surface condition of the target and marking conditions.

2D代码雕刻

Carving may be necessary in cases where parts are plated or hardened after being marked. Carving patterns enable a uniform amount of carving or engraving within a short time.

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