什麼是 PCB windowing

The wires on the PCB are covered with oil, which can prevent short circuit and damage to the device. The so-called window is to remove the paint layer on the wire, so that the wire can be exposed to tin.

How to design PCB window opening  PCB design how to set wiring window opening

正如你在上圖中看到的，它是透過窗戶。 PCB window opening is not uncommon, and the most common one is probably the memory module. Those of you who have disassembled a computer know that the memory module has one gold finger, as shown in the picture below:

How to design PCB window opening PCB design how to set wiring window opening

這裡的金手指意味著打開窗口，即插即用。

開窗也是一個很常見的功能，就是燙錫在後期增加了銅箔的厚度，方便電流過大，常見於電源板和電機控制板。

PCB設計中的開窗和亮銅

在設計中，我們經常會滿足客戶開窗、亮銅的要求，但是由於客戶對這個過程了解不多或者我們不是很清楚，所以很難與他們溝通。 在我們的設計中，經常會遇到客戶需要加屏蔽罩、板邊局部亮銅、通孔開電阻焊、IC散熱片背面露銅、偷錫焊盤等。 According to the actual situation, let’s take a look at some pictures to explain.

1.屏蔽罩

如果客戶需要加屏蔽罩，我們需要做的就是加寬度至少1mm的soldmask。 我們需要跟客戶確認是否需要加鋼網。 添加Soldmask時，我們需要在添加Soldmask的區域鋪設地網的銅皮。 必須覆蓋Soldmask 平面，否則會暴露基板（FR4 等）。 Other non – terrestrial networks should not cross the Soldmask. Add the Soldmask area to the PCB effect to reveal the yellow copper. Unadded areas will be covered by solder blocking.

PCB開窗如何設計_PCB設計如何設置佈線開窗

2, welding window hole

在設計中，我們經常聽到整板塞孔或局部塞孔，加孔時要注意塞孔公司名稱一般是加油BGA，反之，沒有BGA的都是焊窗孔（我公司規格）。 General company specifications exceed 12mil holes must be welded window holes.

PCB開窗如何設計_PCB設計如何設置佈線開窗

3, IC heat dissipation pad

一般在IC散熱焊盤背面加焊窗（加大於或等於表面焊盤的背面soldmask）和孔，背面銅蓋焊，以便更好地讓表面熱量通過銅皮背面的孔更好了。

PCB開窗如何設計_PCB設計如何設置佈線開窗

4. 偷錫墊

In wave soldering, in order to solve the problem of connecting tin caused by the close spacing of pads, we will use tadpole shape of stolen tin pads. Notice the copper skin with the same size as the solder should be added.

PCB開窗如何設計_PCB設計如何設置佈線開窗

PCB佈線窗上錫如何實現

The circuit needs to drive the 8-channel relay, when the multi-channel relay is closed when the current increases, in order to ensure the actual effect, in widening the current line at the same time, it is hoped to remove the welding resistance layer of the current line – green oil layer, after the board is made, you can add tin to the top, thickening the line, can pass more current.

The actual results are as follows:

PCB開窗如何設計_PCB設計如何設置佈線開窗

實現方法如下：

Just draw the line in the ToPlayer (or bottomLayer depending on which layer the preset line is in) layer, and then draw the line that coincides with it in the Topsolder (or bottom solder) layer.

PCB design how to set up the wiring window

CB設計可以在TOP/BOTTOM SOLDER層設置走線。

TOP/BOTTOM SOLDER green oil layer: Coat the TOP/BOTTOM layer with SOLDER green oil to prevent tin from coating the copper foil and maintain insulation.

Green oil window blocking can be set on the pad, through hole and non-electrical wiring of this layer.

1. By default, the pad will open a window in PCB design (OVERRIDE: 0.1016mm), that is, the pad exposes copper foil, expands 0.1016mm, and tin will be added during wave soldering. No design changes are recommended to ensure weldability;

2. By default, the hole will open a window in PCB design (OVERRIDE: 0.1016mm), that is, the hole will expose copper foil, expand 0.1016mm, and tin will be added during wave soldering. 如果設計是為了防止錫進入孔和銅出來，則必須在SOLDER MASK中的孔的附加屬性中選中PENTING選項才能關閉孔。

3、另外，此層也可獨立非電氣佈線，耐焊綠油對應開窗。 如果是在銅箔線上，則用來增強線材的電流容量，焊接時加錫處理； 如果是在非銅箔線上，一般是為logo和特殊字符絲印設計的，可以省略字符絲印層。