为什么威廉希尔官方网站 板通常是绿色的？

我知道大多数印刷威廉希尔官方网站 板都是绿色的。我看到了一些蓝色和黄色的板，但没有那么多——所以我有一个问题：为什么大多数PCBs是绿色的？HTTP://www. PCBIDEX.COM/上述问题不仅是由电子爱好者，但也受到工程师的质疑，所以今天让我们揭开这个谜。威廉希尔官方网站 板的绿色部分是“绿色”印刷威廉希尔官方网站 板，实际上并不是绿色的。唯一的绿色部分是被称为焊料掩模或阻焊剂/油的树脂的外层。这是一种硬化的树脂，带有彩色颜料，以丝网印刷的方式涂在纸板上。焊料掩模的目的是保护湿气和灰尘下面的电子迹线，并控制熔融焊料的流动。一个典型的FR4威廉希尔官方网站 板的实际核心是一个普通的、暗淡的、黄色的颜色，但是焊料掩模可以有很多种颜色，如蓝色、红色、黄色、黑色和白色。甚至更多的异国情调可以找到奢侈，如橙色，粉色，紫色，哑光版本，甚至混合彩色板。所以，问题依然存在，为什么是绿色？大多数PCBs是绿色1的主要原因。绿色可以减轻视觉疲劳和早期检查的援助，由于技术限制，质量检查依赖于工人手动检查板裸眼。整天盯着微小的威廉希尔官方网站 是很累人的工作，但是神经学家和心理学家同意绿光的波长对身体有放松作用，可以减少疲劳。此外，他们发现人眼或锥体中的传感器对绿光最敏感。因此，威廉希尔官方网站 痕迹、焊盘、丝网印刷和空白空间之间的对比度更大。只要从外部观察木板，就可以很容易地识别出外层的缺陷。将下面的绿板图像与蓝色、黄色、甚至黑色和白色等颜色进行比较。对比度越高，误差越容易发现。黑色：倾斜我，你可以看到光中的威廉希尔官方网站 痕迹。白色：痕迹？有什么痕迹？当然，现在PCB制造商使用飞行探针技术和自动光学检测（AOI）来完成这些任务，这在发现错误方面非常有效。但是还有一个非常重要的技术原因，为什么大多数PCBs是绿色的。2。绿色焊料掩模在物理上是优越的，因为传统的方面使用绿色颜料，R&AMD；D制造更好的焊料掩模油专注于标准的绿色。实际使用的化学颜料在应用过程中和在现场影响树脂的性能。当需求正把因素推到他们的极限时，没有人在乎粉红板。因此，与其他美学取向的颜色相比，绿色焊料掩模现在具有优异的性能。最突出的是，商业绿色焊料掩模是唯一可靠的颜色，可以可靠地生产0.1mm（4MIL）的焊料掩模坝。其次是红色，黄色和蓝色，可以产生0.12mm水坝，然后黑色和白色，只能达到0.15mm。焊料掩模坝对于IC和细间距组件是至关重要的，因为它们在防止焊料桥形成方面是有价值的。焊料掩模通常使用丝网印刷技术。一大块油被拖过筛网，下面是威廉希尔官方网站 板。取出威廉希尔官方网站 板进行固化，下一块板在网孔下。但是，嘿，等等，我想要另一种锡膏颜色。那么，你必须去除多余的焊料掩模油，然后在使用新的颜色之前清洗丝网。否则，每个颜色需要一个丝网站。此外，对于白色或较轻的锡膏遮罩，您还需要另一个站的黑色丝网油墨。然后，如果你发现一种颜色不是特别受欢迎的话，会浪费化学物质，并且会降低效率。类似地，由于绿色是默认最流行的颜色，一些工厂将不接受PCB特征与绿色以外的颜色的某些组合。考虑这一点：通常，在PCB工厂，许多不同订单的设计被分组在一个面板上（面板化）。这样，他们可以最大限度地利用PCB房地产，减少浪费。但是有许多过程要求整个面板被加工成相同的表面，如表面处理和电镀。因此，特定面板上的所有板必须具有相同的要求。通过添加越来越多的特定功能，工厂更可能最终以不足以填补一次面板的设计。在图像中添加诸如焊料掩模颜色或板厚度之类的因素乘以可能组合的数量，并使浪费和成本倍增。如果可用，你可能会支付整个面板的费用。因此，通过限制某些颜色和特征的组合，工厂可以降低成本。更不用说，开发一种新的用作电子绝缘体的阻焊剂油，应用和粘着均匀，治愈良好，外观视觉吸引力不是一个简单的过程。因此，期望支付特殊要求，如哑光米色。所以有很多理由去爱和不爱绿色。你最喜欢哪个？为什么？加入我们正在进行的民意调查，选出你最喜欢的下面。SIED公司的PCB制造服务提供了一系列良好的焊料掩模颜色，以适应您的原型调色板从深海蓝色，法拉利红，阳光黄色，光滑黑色，纯白色，当然好的O'Green，并没有额外的成本。



      以下为原文

        I see most printed circuit boards are green in color. I’ve seen some blue and yellow boards, but not so many – so I have a question: Why are most PCBs green? http://www.pcbindex.com/
    The above question is not only asked by electronics hobbyists but also questioned by engineers, so today let’s unravel the mystery.
    What the green part of a circuit board is
    A ‘green’ printed circuit board is not actually green all the way through. The only green part is the outer covering of resin called the solder mask or solder resist/oil. This is a hardened resin with colored pigments that is applied to the boards in a silkscreen fashion. The purpose of solder mask is to protect the electronic traces underneath from moisture and dust and to control the flow of molten solder. The actual core of a typical Fr-4 circuit board is a plain, dull, yellow color, but the solder mask can come in many colors such as blue, red, yellow, black and white. Even more exotic colors can be found for the extravagant such as orange, pink, purple, matte versions and even mixed color boards. So, the question remains, why green?
Top Reasons Why Most PCBs are Green in Color
    1. Green can relieve visual fatigue and aid in inspections
    In the early days, due to technological restrictions, quality inspections relied on workers manually checking the boards with their bare eyes. Squinting at tiny circuits all days is tiring work, but neurologists and psychologists agree that the wavelength of green light has relaxing effects on the body and can reduce fatigue. Additionally, they have found that the sensors in human eyes, or cones, are most sensitive to green light. Therefore, the contrast is greater between the circuit traces, pads, silkscreen printing and empty spaces. Just by observing the boards from the outside, one can easily identify defects in the outer layers. Compare the below images of green boards to other colors such as blue, yellow or even black and white. With higher contrast, errors are easier to spot.
    Black: Tilt me and you can see the circuit traces in the light. White: Traces..? What traces?
    Of course, nowadays PCB manufacturers use flying probe techniques and Automatic Optical Inspection (AOI) for these tasks, which is very effective in spotting errors. But there is another very important technical reason why most PCBs are green.
    2. Green solder mask is physically superior
    Due to the traditional aspect of using green pigments, R&D into making better solder mask oils focused on the standard green color. The actual chemical pigments used influence the performance of the resin during application and in the field. When demand is pushing form factors to their limits, no one cares about having pink boards. As a result, green solder mask now has superior properties compared to other aesthetically orientated colors.
    Most prominently, commercial green solder mask is the only available color that can reliably produce solder mask dams of 0.1mm (4mil). Next up is red, yellow and blue that can produce 0.12mm dams and then black and white which can only achieve 0.15mm. Solder mask dams are vital for ICs and fine pitch components since they are valuable in preventing solder bridges from forming.
    Solder mask is typically applied using silkscreen techniques. A large blob of oil is dragged across a screen mesh with the circuit board underneath. The circuit board is removed for curing, and the next board goes under the mesh. But hey, hold on, I want another solder mask color. Well, then you have to remove the excess solder mask oil and wash the silkscreen before applying the new color. Otherwise, a silkscreen station is needed for each color. Furthermore, for white or lighter solder mask shades, you’ll also need another station for the black silkscreen ink. Then, if you find that one color is not particularly popular, the chemicals will be wasted and efficiency will be impaired.
    Similarly, some factories will not accept certain combinations of PCB features with colors other than green, since green is by default the most popular color. Consider this: typically, in a PCB fab house, many designs from various orders are grouped together on one panel (panelized). This way, they can make the most out of PCB real estate and reduce waste. But there are many processes that require the entire panel to be processed the same, like surface finishes and plating for castellated holes. So all boards on a particular panel must have the same requirements. By adding more and more specific features, the factory is more likely to end up with insufficient designs to fill a panel at one time. Adding factors such as solder mask color or board thickness into the picture multiplies the number of possible combinations, and multiples the waste and therefore cost. If available, you may end up paying for the cost of the entire panel. So by restricting certain combinations of colors and features, factories can keep costs down.
    Not to mention, developing a new solder mask oil that performs well as an electrical insulator, applies and adheres evenly, cures well and looks visually appealing is not a simple process. As such, expect to pay a premium for special requests like matte beige.
    So there are many reasons to love and not to love green. Which do you like best and why? Join our ongoing poll to pick your favorite below. Seeed Fusion’s PCB fabrication service offers a good range of solder mask colors to suit your prototyping palette from deep-sea blue, Ferrari red, sunshine yellow, slick black, pure white and of course good ol’ green and at no extra cost.