Analysis of the principles and applications of etching printed circuit boards

1. Definition and working principle of etching printed circuit boards

Etching printed circuit boards is a technology that uses chemical etching to manufacture circuit lines. Its working principle is based on the interaction between chemicals and metal surfaces, thereby etching away the required metal materials to form the required circuit pattern. Etching printed circuit boards usually consists of the following main steps:

1.1 Drawing design: Use circuit design software to draw the circuit diagram according to the function and layout requirements of the circuit. This step is the key to manufacturing high-quality and reliable circuit boards.

1.2 Making negatives: Convert the circuit diagram into negatives, usually using printing technology to print the pattern on the negative. The pattern on the negative is the negative form of the required circuit line.

1.3 Making photosensitive impedance: Cover the negative with the photosensitive material, and form a photosensitive impedance layer through the process of exposure and development. This layer will play a protective and positioning role.

1.4 Making skeletons: In order to improve the etching effect and strengthen the mechanical strength of the circuit board, it is necessary to make a skeleton on the photosensitive impedance layer, usually using copper cloth mesh or wire frame.

1.5 Etching treatment: Superimpose the prepared negatives and skeletons with the material substrate, and remove the unnecessary metal materials by chemical etching.

1.6 Cleaning and inspection: After etching, the circuit board needs to be cleaned to remove residual chemicals. Then the quality of the circuit board is verified by visual and electrical inspection.

Tinning workshop

2. Application fields of etched printed circuit boards

2.1 Communication equipment: Whether it is a mobile phone, router or communication base station, etched printed circuit boards are widely used in the manufacture of communication equipment. It can realize complex circuit design, provide stable signal transmission and efficient communication functions.

2.2 Computer hardware: In the field of computer hardware, etched printed circuit boards are an important medium for connecting various hardware components. It can carry and transmit signals from various components such as processors, memory, storage, etc. to ensure the normal operation of computer systems.

2.3 Automotive electronics: With the rapid development of automotive electronics, etched printed circuit boards are more and more widely used in automotive electronics. They are used to control engines, seat adjusters, in-vehicle entertainment systems and other aspects, providing stable signal transmission and function control.

2.4 Medical equipment: The medical industry has extremely high requirements for reliable circuit boards because they are directly related to life safety. Etched printed circuit boards can provide precise signal transmission and reliable control functions, and are widely used in the manufacture of medical equipment.

2.5 Home appliances: From refrigerators and washing machines to televisions and air conditioners, etched printed circuit boards are present in almost every detail of home appliances. They enable compact design and multifunctional control of circuits, improving the performance and user experience of home appliances.

In summary, etched printed circuit boards, as an important manufacturing technology, play a vital role in the electronics industry. It realizes the manufacture of complex circuits through chemical etching and is used in many fields such as communication equipment, computer hardware, automotive electronics, medical instruments, and home appliances. Only by deeply understanding the principles and applications of etched printed circuit boards can we better understand the foundation of modern electronic devices and promote the innovative development of technology.