In LED chip packaging, why is the gold wire curved instead of straight? Why weld a golden ball?

In the process of glue sealing, glue will produce certain internal stress. If the gold wire is welded into a straight line, there is a great chance that the internal stress will break the gold wire. Secondary welding and golden ball are also used to prevent secondary solder joint from false welding. There are many problems in secondary welding and virtual welding, and the yield is low. The customer found a broken circuit when using it. \ x0d \ x0d \ is a solid-state semiconductor device. The core of LED is semiconductor chip. One end of the wafer is attached to the bracket, one end is the negative electrode, and the other end is connected to the positive electrode of the power supply, so that the whole wafer is encapsulated by epoxy resin. \x0d\, also known as led light-emitting chip, is the core component of led lamp, namely pn junction. \x0d\ Its main function is to convert electric energy into light energy, and the main material of the chip is monocrystalline silicon. The semiconductor wafer consists of two parts, one is a P-type semiconductor, in which holes are dominant, and the other is an N-type semiconductor, mainly electrons. But when these two semiconductors are connected together, a pn junction is formed between them. When the current acts on the chip through the wire, the electrons will be pushed to the P region, where they will recombine with holes and then release energy in the form of photons, which is the principle of LED light emission. The wavelength of light, that is, the color of light, is determined by the material forming the pn junction.