What are the laser automatic soldering applications for TWS Bluetooth headsets?

April 18, 2024

After the arrival of wireless Bluetooth headsets, almost no one uses wired headsets anymore. It is not only inconvenient but also restrictive. In comparison, Bluetooth headsets have a beautiful appearance and good sound quality. They have solved all the disadvantages of wired headsets and are convenient. Become people's favorite. In particular, TWS headphones are trendy among young people today.
What are TWS headphones?
They are generally composed of a main control chip, battery, flexible circuit board, and audio controller. TWS earphones do not have traditional physical wires. The left and right earphones form a stereo system through Bluetooth. The mobile phone can be connected to one receiving end. This receiving end will distribute the stereo sound to another receiving end through wireless transmission to form a stereo system.

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To meet consumers' demands for high endurance, high security, and personalized electronic products, major Bluetooth headset manufacturers have begun to gradually produce Bluetooth headsets with better sound quality, various specifications, and materials. Because of this, the processing difficulty and technology of Bluetooth headsets are also constantly upgrading. Traditional processing technology has touched the pain point of upgrading the processing technology of new Bluetooth headsets.
Laser soldering application for TWS earphones
Dismantling TWS earphones, TWS earphones generally consist of a main control chip, battery, antenna, flexible circuit board, and audio controller. The various components are electrically connected through soldering, allowing the headset to have functions such as sound transmission and intelligent control. Let's follow Zichen Laser to see what applications of TWS headphones use laser soldering.

Platform laser welding
Laser soldering application of main control chip
The main control chip is simply a chip IC with an integrated Bluetooth function. It is used for short-distance wireless communication. Its application scenarios include audio transmission, data transmission, location services, and device networks. For the welding of different Bluetooth main control chips, the traditional process uses manual soldering iron welding. Although this welding technology is low-cost, its shortcomings are also obvious, such as slow welding efficiency, unsightly weld marks, large solder joints, and high technical requirements for operators. Therefore, it is not suitable for increasingly sophisticated chip welding, so we have turned our attention to new laser soldering technology.

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Since laser soldering uses non-contact welding and the laser can reach the micron level, it is widely used on chips. The main advantage of this process is that it can achieve extremely small-sized interconnections, and the droplet size can be as small as tens of microns; the tin material distribution and heating processes are carried out simultaneously, and the production efficiency is high; through digital control of the tin material, spraying can be realized Precise control of position to achieve extremely small pitch interconnections. It is a new type of microelectronic packaging and interconnection technology.
Laser welding application of earphone button batteries
During the processing of new button batteries, they are generally applied to circuit boards, and pins need to be soldered on their surfaces. According to the needs of different circuit boards, the forms of welding pins are often various. At the same time, the welding pins of new button batteries are more complex, the resistance welding process is not very professional, the size of the solder joints is inaccurate, it is easy to oxidize and turn black, and the blades are large. And other issues.
Therefore, most button batteries are laser welded. Laser welding technology can meet the diversity of button battery processing technologies, such as welding of dissimilar materials (stainless steel, aluminum alloy, nickel, etc.), irregular welding tracks, excellent welding appearance, strong welds, more detailed welding points, and more Precise positioning of welding areas.
Laser soldering application for TWS earphone antenna
As an important part of the Bluetooth module, the Bluetooth antenna also plays an important role in TWS headsets. The design of the Bluetooth antenna and its fit with the headset help improve the transmission quality of Bluetooth communication, thereby improving the user's actual use experience. In current TWS headsets, there are mainly four types of Bluetooth antennas that are widely used, namely PCB onboard antenna, FPC antenna, ceramic antenna, and LDS antenna.
Flexible circuit board laser soldering application
As an important part of TWS Bluetooth headsets, flexible circuit boards can be said to be the blood vessels of electronic products. With the rapid development of the industry, flexible circuit board processing technology is also constantly innovating. The FPC laser soldering machine can apply high-intensity light energy (650 milliwatts/square millimeter) to a small focus (100 to 500 microns). Such high energy can be used to laser solder materials using non-contact soldering without damaging the circuit board.