What are the applications of laser drilling machines on FPC?

With the rapid development of laser technology, its application in industry has become more and more extensive, and laser drilling technology has also been greatly improved. With the increase of small hole parts materials in aerospace, automobile manufacturing, electronic instruments, chemical industry and other industries, the requirements for hole accuracy and size have also increased accordingly. Its material types are becoming more and more diverse, with higher hardness and higher melting point. Traditional processing methods can no longer meet the needs of some processes.

For example, the current development trend of electronic products is to be thin, short, high frequency and high speed. In this way, people in the FPC industry began to develop more advanced drilling technology to meet the needs of smaller and smaller apertures. On FPC, through-holes are an important impedance discontinuity point, and filling blind holes in the upper and lower layers can effectively avoid impedance mutations caused by through-holes. Therefore, blind hole connection should be used as much as possible on high-frequency and high-speed boards, and blind hole connection inevitably uses laser drilling.

The common FPC double-sided board process is shown in the figure below:

Drilling is the first stop in the FPC product process, and the drilling quality is directly related to the function and precision of the product. In the past, FPC drilling was mainly achieved through mechanical drilling. However, with the continuous development of high-density FPC, mechanical drilling technology can no longer meet the market demand for small diameter, high precision and high efficiency. At present, laser drilling has become the mainstream processing technology for FPC micro-plate holes, and mechanical drilling is being replaced by laser drilling.

There is no energy loss in the mechanical drilling process, the hole diameter is uniform, the drilling cost is low, but the hole accuracy is poor; laser drilling has high hole accuracy. Due to energy loss during the drilling process, the hole diameter is inverted trapezoidal and the drilling cost is high.

Mechanical drilling illustration:

Laser drilling diagram:

The advantages of laser drilling are as follows:

1. High accuracy: The camera automatically locates the drilling position within the recognition range, and the computer analyzes and controls the motion.

2. Fast speed: The camera has a short reflection time, and the drilling position can be controlled as soon as the drilling position is determined.

3. Powerful functions: The sampling diagram can be saved and can be directly called for reuse, and the computer system and software can be upgraded in real time.

4. Long service life: The laser drilling machine is equipped with imported parts, the whole machine has high performance, and the mechanical equipment has a long service life.

5. Simple operation: Human-machine interface, set the working mode directly on the touch screen.

6. High recognition: The special light source can automatically identify the positioning hole diagram of materials with high reflection, high blackness, etc., and can automatically compensate for recognition.

In recent years, the domestic FPC processing and molding market has continued to grow. As the main technical stage of FPC drill bit molding, the large amount of micro-hole processing demand has provided a huge market for FPC drill bit services, while putting forward higher requirements for drill bit technology. The laser drill bit market has broad prospects.