Analysis of design scheme for anti-moisture structure of LED bracket
The LED bracket is the substrate of the LED lamp bead before the package, which functions to protect the solid crystal bonding wire and the silicone molding, and turns on the circuit and affects the optical and electrical characteristics. The performance of the structure of the bracket directly affects the performance of the LED lamp bead. At present, many lamp beads are dead. After the microscope observation, the chip in the lamp bead does not appear abnormal, but the alloy wire connecting the chip is separated from the metal substrate to cause an open circuit. As shown in Figure 1.
　
Figure 1: The alloy wire connecting the chip is separated from the metal substrate to cause an open circuit.
At the same time, it was found that the lamp beads causing this phenomenon were directly or indirectly exposed to the air, and there was moisture in the air. It can be inferred that the anti-moisture structure of the LED bracket is not well made, causing moisture to penetrate into the lamp bead, thereby causing the encapsulant to be easily detached from the metal substrate in the environment where the LED lamp bead is long-term lit, so that the unplugging is welded. An alloy wire on a metal substrate to form a circuit break.
With the increasing demand for LEDs in the global light source market, the use of LED lamp beads is becoming wider and wider, and users are increasingly demanding the performance of LED lamp beads. If the moisture-proof structure of the LED holder is not well designed, it is inevitable to limit the use conditions, use areas, fields of use, and the like of the LED lamp bead. As an LED designer and manufacturer, there must be a breakthrough in the moisture-proof structure of the LED bracket.
First, the basic knowledge of liquid flow
The nature of the flowing liquid is between the gas and the liquid. On the one hand, it is like a solid, has a certain volume, is not easy to compress; on the other hand, it is like a gas, has no certain shape, and has fluidity. The flowing liquid is affected by inertia force, viscous force, etc., and the pressure in any direction in the interior is not equal.
The flowing liquid will be subjected to the resistance along the path and the local resistance along the way. The mechanical energy loss caused by the resistance along the path is called the loss along the path. The energy loss that overcomes the local resistance is called the local loss. The energy loss of all flowing liquids is equal to the sum of the losses along the sections and the local losses.
Second, the five points of moisture-proof structural design
The moisture-proof structural design, as its name suggests, is to keep the moisture out of the way, or to stop the flow of moisture inside it. The plastic and metal substrate of the bracket are two different materials. The external force is used to bond the two together. It is a physical bond. Even if the adhesive flaw is not visible to the naked eye, on a magnifying glass of several tens of times, There must be a gap on the interface, as shown in Figure 2. This determines that the bracket cannot keep the moisture out of the body, which means that moisture will penetrate into it. Therefore, the moisture-proof structure design of the bracket, in a strict sense, relies on the related structural design within it to reduce the fluid that penetrates into it. To reduce the fluid, that is to say, all the energy of the fluid is lost as much as possible in each loss of path and local loss.
　
Figure 2: There is a gap between the plastic and the metal substrate of the bracket after the physical bonding
Experiment with the TOP VIEW model bracket, immerse the empty bracket in the red ink, and red ink is slightly covered on the bracket pin (Note: If you want to make the experiment more obvious, pour alcohol into the red ink, the proportion The mixture was stirred at 1:1, and the experiment was terminated after 5 minutes. The whole process was observed with a microscope to observe the inside of the stent cup. The experimental conclusion is that some stents seep quickly, some stents seep slowly, some stents seep slightly, and some stents seep heavily. Take some of the brackets after the experiment, and immediately cut them along the gap between the plastic and the metal substrate with a cutting pliers. It can be found that there are red ink marks on the surface and edges of the metal substrate. Therefore, it can be concluded from the experiment that there are two ways for red ink to penetrate into the body of the stent, one is the edge of the copper wrapped with plastic, the other is the surface of the copper wrapped with plastic, and the front and back of the copper are the same. The former is more serious.
To solve the above arguments, we can solve the problem from three aspects: First, seek the best cooperation between plastic and metal substrate, which is related to the knowledge of materials science, not in the scope of this article; second, the plastic injection molding process, the pursuit of the most Good mold temperature and die time, which is related to the content of the injection molding process, and is not analyzed in this paper; the third is the treatment on the metal substrate, which is the moisture-proof structure design mentioned in this paper.
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The best supermarket point of sale system should make it more convenient for you to process payments, manage the store and satisfy your customers. As such, it is advisable to get a solution that will also streamline operations, control cash flow, track the inventory, employees and customers.
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In order to fully customize your Gmaii Supermarket Pos System and save money, you should consider which payment processor you`ll go with. Also, which inventory and CRM capabilities your POS of choice offers.
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