{"id":2677,"date":"2024-08-17T08:16:09","date_gmt":"2024-08-17T00:16:09","guid":{"rendered":"https:\/\/www.jingpengpcb.com\/?p=2677"},"modified":"2026-10-02T19:43:00","modified_gmt":"2026-10-02T11:43:00","slug":"the-trend-of-high-precision-technology-for-hdi-circuit-boards","status":"publish","type":"post","link":"https:\/\/www.jingpengpcb.com\/en\/blog\/the-trend-of-high-precision-technology-for-hdi-circuit-boards\/","title":{"rendered":"Trends in High-Precision Technology for HDI Printed Circuit Boards"},"content":{"rendered":"

As electronic products become increasingly sophisticated and compact,HDI Circuit Boards<\/a>(PCB) High density and high precision have become trends in the manufacturing industry. This article will explore how to achieve high density through technologies such as fine line widths and spacing, microvias, and narrow ring widths, and will discuss the challenges and breakthroughs that this high density brings to high precision.<\/p>\n

\"HDI<\/p>\n

1. Fine-Pitch Wiring Technology<\/h2>\n

In the manufacture of high-density printed circuit boards, fine-line technology plays a critical role. As line widths continue to decrease\u2014from 0.20 mm to 0.005 mm\u2014the following technologies are required:<\/p>\n

\u2013 Thin copper foil and precision surface finishing<\/h3>\n

Thin or ultra-thin copper foil (less than 18 \u00b5m) is used as the substrate, along with precision surface treatment techniques, to ensure the accuracy of the line width.<\/p>\n

\u2013 Dry-film and wet-film application processes<\/h3>\n

By using thinner dry films and a wet lamination process, these thin, high-quality dry films can reduce line width distortion and defects. Wet lamination also fills small air gaps, increases interfacial adhesion, and improves the integrity and precision of the conductors.<\/p>\n

\u2013 Electrodeposited photoresist<\/h3>\n

Electrodeposited photoresist (ED) films are used. Their thickness can be controlled within the range of 5\u201330 \u00b5m, enabling the production of even finer conductive lines. This process is particularly suitable for narrow ring widths, zero ring widths, and full-board electroplating. Currently, there are more than ten ED production lines in operation worldwide.<\/p>\n

\u2013 Parallel Light Exposure Technology<\/h3>\n

Parallel light exposure technology can overcome the oblique rays produced by point light sources, ensuring the accuracy of line width dimensions and the smoothness of edges. Although parallel exposure equipment is expensive, it operates in a high-cleanliness environment and provides critical support for the fabrication of high-density circuits.<\/p>\n

\u2013 Automated Optical Inspection (AOI) Technology<\/h3>\n

Automatic optical inspection technology has become an essential tool in the manufacturing of fine-pitch circuits, used to verify the quality and integrity of the circuits. This technology is rapidly gaining widespread adoption and evolving, ensuring the reliability of high-density circuits.<\/p>\n

2. Microporous Technology<\/h2>\n

Micro-hole technology also plays a key role in the manufacture of surface-mount printed circuit boards. Micro-holes are functional holes primarily used for electrical interconnections and therefore require high precision. Advances in micro-hole technology have largely depended on breakthroughs in CNC drilling machines and micro-drill bit technology.<\/p>\n

\u2013 CNC Drilling Machine<\/h3>\n

New breakthroughs and advancements have been made in CNC drilling machine technology, leading to the development of a new generation of CNC drilling machines characterized by their ability to drill micro-holes. Micro-hole drilling machines are twice as efficient as conventional CNC drilling machines, experience fewer malfunctions, operate at higher speeds, and can drill micro-holes ranging from 0.1 to 0.2 mm. These machines use high-quality small drill bits with a high cobalt content, capable of meeting the requirements of high-density circuits.<\/p>\n

\u2013 Laser Drilling<\/h3>\n

Laser drilling is another microhole-forming technique. Although it has some drawbacks, such as the formation of flared holes and contamination from high-temperature ablation, it is still used in the manufacture of thin, high-density microhole plates, particularly in high-density interconnect technology.<\/p>\n

\u2013 Buried, Blind, and Through-Hole Technologies<\/h3>\n

The combination of buried, blind, and through-hole technologies is also an important approach to increasing the density of printed circuit boards. Since these are all microvias, concentrating the interconnections between inner layers as closely as possible can significantly reduce the number of through-holes, thereby increasing interconnection density. Printed circuit boards featuring buried, blind, and through-hole structures are typically manufactured using a \u201cpanel-splitting\u201d process, making precise positioning critical.<\/p>\n

Through the application of fine-line technology, microvia technology, and buried, blind, and through-hole technologies, the manufacturing industry can continuously overcome technical barriers to produce smaller and more precise printed circuit boards that meet the evolving demands of electronic products.<\/p>\n

\n

Frequently Asked Questions<\/strong><\/p>\n

1. What is high-density printed circuit board (PCB) design?<\/strong><\/p>\n

High-density design refers to the use of technologies such as fine line widths and spacing, micro-vias, and narrow ring widths to accommodate more circuits and interconnections on a PCB, thereby enabling the development of smaller electronic products.<\/p>\n

2. Why is high precision so important in the manufacture of high-density printed circuit boards?<\/strong><\/p>\n

High precision ensures the accuracy and stability of the circuit, particularly in the manufacture of micro-holes and fine conductors.<\/p>\n

3. What is microporous technology?<\/strong><\/p>\n

Micro-hole technology is a technique used in PCB manufacturing to create tiny holes for electrical interconnections. These holes can be very small, requiring a high-precision manufacturing process.<\/p>\n

4. Why are there limitations to laser drilling in the manufacture of micropores?<\/strong><\/p>\n

Laser drilling is subject to issues such as the formation of flared holes and contamination from high-temperature ablation, which limit its application in certain fields.<\/p>\n

5. Why are buried, blind, and through-hole technologies important?<\/strong><\/p>\n

Buried, blind, and through-hole technologies can reduce the number of through-holes and increase interconnect density, making them one of the key technologies in high-density PCB manufacturing.<\/p>","protected":false},"excerpt":{"rendered":"

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