The HDI product with a fine pitch of 2mm utilizes the flexibility and foldability of rigid-flex boards, maximizing the use of indoor space and significantly reducing the system's volume. In the precision manufacturing process, the minimum line width and spacing of the board have reached 5mil and 4mil, respectively, enhancing the product's integration density. It is suitable for industrial control equipment that requires complex spatial layout and high-reliability connections. The core technology includes thin dielectric PP lamination, high-order HDI hole filling and conductivity control, and precise resistance control of inductive coils. The integrated application of these technologies ensures the product's exceptional performance in industrial control devices.