Why do QR codes use PCB laser marking technology instead of printing or inkjet printing technology?

With the continuous development of communication technology, mobile communication terminal equipment continues to emerge, from a single voice call function to the comprehensive development of data, voice, image, music, multimedia and other fields. Among them, the representative products are embodied in smart phones, which are powerful. With the development of lightweight, the requirements for hardware are getting higher and higher, especially the requirements for highly integrated hardware such as semiconductor chip integration are getting higher and higher, and these hardware carriers are inseparable from the application of PCB circuit boards. So do you know what mobile phone circuit boards are and how to deal with them? Laiser analyzed the application of laser processing technology in mobile phone circuit boards and introduced the processing technology of mobile phone circuit boards.

The application of mobile phone circuit boards is mainly reflected in the main PCB circuit boards and sub-PCB circuit boards. The application of mobile phone circuit boards includes ultraviolet laser cutting technology, laser marking technology and laser drilling technology.

Depending on the shape and special purpose of the mobile phone, the PCB circuit boards designed with PCB rigid circuit boards also have different shapes, especially some curved parts, which makes the PCB difficult to cut and split. PCB cutting methods include gong knife board, laser board, etc.

Milling cutters or cutting tools are used for the processing of early mobile phone circuit boards. The disadvantage is that only straight lines can be processed, dust, stress and burrs can be produced, which affects the performance and quality of the product and is slowly eliminated.

Among the gong cutters and laser depaneling machines currently in use, the laser depaneling machine is a rising star, with the advantages of stress-free cutting edges, high processing accuracy, no dust, and no burrs. Compared with laser depaneling, the advantage of the gong cutter is high processing efficiency, and the disadvantage is low processing position accuracy, which is nothing more than the position accuracy requirement below 0.1mm, causing certain stress deformation to the circuit board. Therefore, in the mobile PCB industry, the laser depaneling machine has gradually formed an advantageous product and has been introduced into the market application.

The laser depaneling machine uses a high-power ultraviolet laser cutting machine, which has little thermal impact on the material, and the degree of carbonization is lower than the traditional carbon dioxide circuit board laser cutting.

The main functions of mobile phone PCB circuit board marking are divided into two aspects: one is to promote the corporate brand at the product marking, and the other is to mark the QR code, including product-related information, to facilitate traceability applications in downstream links.

As we all know, there are many words and symbols on the circuit board that correspond to the corresponding components. This marking method mainly adopts printing technology, so why does the QR code adopt PCB laser marking technology instead of printing or inkjet printing technology?

The main reason is that the QR code information generated during the printing process will be covered by other processes, and the printing is in the early stage. On the SMT production line, the information workstation that needs to be marked with PCB QR code includes 1-3 workstations according to different needs, so it is necessary to establish an independent workstation to mark the QR code of the PCB circuit board.

The difference between PCB inkjet printing technology and PCB laser printing technology is that inkjet printing is nothing more than a small QR code with a character count of the number of character digits. Usually, the mobile phone PCB area is small, the blank area left is small, and a smaller QR code is required. Obviously, the defects of inkjet printing technology limit its development. The corresponding PCB laser printer has the advantage of fine spot. Multi-digit QR codes can be marked 1*1mm below 50 microns, which is clear, beautiful and readable. Compared with inkjet printing technology, PCB laser printing technology has the advantages of one-time investment, environmental protection, no pollution and high safety.

The laser technology means in the laser marking technology of mobile phone PCB circuit board mainly include ultraviolet laser marking machine, carbon dioxide laser marking machine, green light laser marking machine, fiber laser marking machine, etc. According to different materials and requirements, the use of equipment is also different, mainly manifested in optical components such as lasers, so the price and cost are also different. For example, green PCB usually uses carbon dioxide laser marking machine, while white oil PCB usually uses ultraviolet laser marking machine.

In the field of PCB circuit boards, in addition to the above-mentioned PCB laser cutting and PCB laser marking, the application of laser processing technology also includes PCB laser drilling technology, whose main function is blind holes and through-hole PCB circuit boards; and PCB engraving machines, which remove the copper plate on the surface of the PCB or engrave the required shape. Laisai Laser is a technical manufacturer specializing in the production of PCB laser cutting and marking machines. Friends who have this need can contact us. If you need a PCB drilling machine, you can find ESI and Hitachi.