1, computer: due to the computer running faster, the circuit complexity is higher, need to use multi-layer circuit board to meet the needs of circuit design and implementation.
2, communication equipment: four-layer circuit boards through the internal copper layer of the lead to achieve the signal transmission between the multilayer board, further improving the transmission efficiency and reliability.
3, automotive electronics: four-layer circuit boards have a high degree of stability and reliability, to ensure the normal operation of automotive electronic equipment, improve the safety and reliability of the car.