Patent Application
20180042121
This application claims priority to Chinese Application No. 201610639104.6, filed Aug. 5, 2016, which is incorporated herein by reference in its entirety.
The present disclosure relates to a circuit board, more particularly to a circuit board with solder thieves.
As electronic products are developing toward miniaturization and digitization, circuit boards are also developing toward high density and high precision, so the process design of the circuit board is more and more complex, a pitch between pins of components is getting shorter and shorter.
Wave soldering is to make a molten solder to form a solder peak which meets the design requirement, and then make a circuit board on which components have been mounted in advance pass through the solder peak, so as to achieve a soft soldering process which makes a mechanical and electrical connection between a soldering terminal or pin of the component and a pad of the circuit board. A general process of the wave soldering is: inserting the component into a corresponding component hole of the pad, pre-coating soldering flux, preheating, wave soldering and checking.
When multi-row plug-in connectors are in wave soldering, metal pins of plug-in connectors will leave solder projections in an direction opposite to an advancing direction of a track, and the solder projections cannot be absorbed with respect to the last column of pins, and are easy to lap adjacent (upper, lower, left, right) pins, so as to cause short circuit.
In order to resolve the above problem, a method of preventing solder bridging during wave soldering of plug-in connectors on a printed circuit board (PCB) is disclosed in Chinese Patent Application Publication No. CN104105358A. As shown in
However, although the above-mentioned prior art defines that the width of the solder thief 310 is greater than or equal to the diameter of the plug-in connector pad 320, when a solder projection has lapped the adjacent (upper, lower, left, right) pin, because an area of the solder thief 310 is less than a sum of areas of the two plug-in connector pads 320, the solder thief 310 of the above patent does not have sufficient traction force and is easy to still make the solder projection left so that a short circuit problem is caused.
In addition, since the solder thief 310 is only provided near the plug-in connector pad 320 which is the last one in each row, the circuit board 300 must be advanced in a single direction during wave soldering, otherwise it cannot prevent solder bridging and short circuit.
In order to solve the above problem, one object of the present disclosure is to provide a circuit board with solder thieves, which does not cause short circuit during wave soldering.
A further object of the present disclosure is to provide a circuit board with solder thieves and preventing short circuit, which will be not necessary to advance in a single advancing direction during wave soldering.
In order to achieve the above objects and other advantages, the present disclosure provides a circuit board with solder thieves, the circuit board comprises: a plurality of plug-in connector pads arranged in two rows on the circuit board; a plurality of conductive traces each connecting with one plug-in connector pad; and a first solder thief and a second solder thief, both of the first solder thief and the second solder thief are provided on one side of the two rows of plug-in connector pads, the one side is away from an advancing direction of the circuit board during wave soldering, each of an area of the first solder thief and an area of the second solder thief is greater than or equal to a sum of areas of two plug-in connector pads adjacent to corresponding one of the first solder thief and the second solder thief.
In an embodiment, each of the area of the first solder thief and the area of the second solder thief is greater than or equal to a sum of the areas of the two plug-in connector pads adjacent to the corresponding one of the first solder thief and the second solder thief and an area between the two plug-in connector pads.
In an embodiment, a sum of the area of the first solder thief and the area of the second solder thief is greater than or equal to a sum of areas of three plug-in connector pads adjacent to the first solder thief and second solder thief and an area among the three plug-in connector pads.
In an embodiment, the circuit board further comprises a third solder thief and a fourth solder thief, both of the third solder thief and the fourth solder thief are provided on the other side of the two rows of plug-in connector pads, the other side is opposite to the first solder thief and second solder thief, each of an area of the third solder thief and an area of the fourth solder thief is greater than or equal to a sum of areas of two plug-in connector pads adjacent to corresponding one of the third solder thief and the fourth solder thief.
In an embodiment, each of the area of the third solder thief and the area of the fourth solder thief is greater than or equal to a sum of the areas of the two plug-in connector pads adjacent to the corresponding one of the third solder thief and the fourth solder thief and an area between the two plug-in connector pads.
In an embodiment, a sum of the area of the third solder thief and the area of the fourth solder thief is greater than or equal to a sum of areas of three plug-in connector pads adjacent to the third solder thief and fourth solder thief and an area among the three plug-in connector pads.
In an embodiment, the first solder thief and the second solder thief are merged into a fifth solder thief, an area of the fifth solder thief is greater than or equal to a sum of areas of three plug-in connector pads adjacent to the fifth solder thief and an area among the three plug-in connector pads; the third solder thief and the fourth solder thief are merged into a sixth solder thief, an area of the sixth solder thief is greater than or equal to a sum of areas of three plug-in connector pads adjacent to the sixth solder thief and an area among the three plug-in connector pads.
The beneficial effect of the present disclosure lies in that: sizes of the solder thieves on the circuit board with solder thieves according to the present disclosure each are large enough to form a sufficient amount of traction force during wave soldering, so it will not leave solder projections, therefore it will not cause short circuit. Further, when the solder thieves are respectively provided on both sides of the plug-in connector pads, the circuit board does not have to be limited to a single advancing direction during wave soldering, which increases flexibility of the wave soldering process and avoids the loss caused by an improper advancing direction.
The present disclosure may be better understood from the following detailed description in combination with the Figures, a similar element is indicated by a like reference numeral in different embodiments, and in the Figures:
Hereinafter embodiments of the present disclosure will be described in detail with reference to the figures.
As shown in
The circuit board with solder thieves of the embodiments according to the present disclosure described above are merely exemplary and may have various modification and variations, for example, the solder thief may be any suitable shape such as a circle, a square and the like, and the solder thieves on one side of the plug-in connector pads can be merged and the solder thieves the other side are not merged.
It is to be understood that while the preferred embodiments are illustrated and described above, the present disclosure is not limited to the specific embodiments described above, those skilled in the art may devise various modifications and variations without departing from the spirit and scope of the appended claims. Therefore, it should be noted that various modifications and variations cannot be considered to be independent of the technical spirit and expectations of the present disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201610639104.6 | Aug 2016 | CN | national |
