在印刷電路板上製備印刷式精密碳膜電阻器的研究

A Study of Fabrication of Fine Printed Carbon Resistors on PCB

林斌淵(Bin-Yuan Lin)

指導教授 ： 李有璋

中原大學/工學院/機械工程研究所/碩士(2014年)

https://doi.org/10.6840/cycu201400868

摘要

將為數眾多之被動元件整合在印刷電路板(PCB)中，使用多層壓合的方式，將其埋入到電路板的內層中，藉以大幅提升印刷電路板之功能，是目前高密度電路板製程技術最具發展潛力之方法。這其中電阻元件在消費性電子產品中扮演非常重要的角色，它可以控制或限制線路中電流流通量或是提供一個電壓降的功能。由於使用高分子厚膜電阻取代傳統金屬，有著價格便宜，易加工且方便使用等優點，然而缺點為電阻之形狀與厚度較難控制，導致阻抗值變異性較大。本計畫的目的就是利用奈秒與皮秒雷射進行高分子厚膜的精密修阻，使電阻值落在所設定的微小範圍電阻值。計畫首先建立雷射光路系統，利用各式光學元件，將雷射光束聚焦於PCB 基板上電阻進行雷射修阻。接著探討不同雷射能量分佈、雷射功率、掃瞄速度、雷射重疊率等製程參數與不同形狀切割之間的關係，再以探針量測修阻完成電阻值，最後再將切割好之電阻疊放於膠片中熱壓合，完成雷射修阻之流程。

關鍵字

網板印刷 ； 鋼板印刷 ； 導電碳黑 ； 雷射切割

並列摘要

Integrating numbers of passive components in printed circuit board (PCB) through using multi-layer lamination to embed components into the inner layer is one of the most potential methods to enhance the performance of PCBs. Among them, the resistive element plays an important role in the consumer electronics. It can control and limit the current or to provide a voltage drop. Polymer thick film (PTF) resistors have gradually replaced conventional metallic resistance due to their low cost and unsophisticated process. However, the thickness and shape of the PTF is difficult to maintain a good uniformity, leading to the large variation of impedance. In this study, nanosecond and picosecond laser trimming processes were performed to modify the printed resistances to lead the resistance within acceptable error range. I designed, simulated and setup the laser optical system to focus the laser beam on the PCB, and try different parameters such as laser energy distribution, laser power, laser scanning speed, and laser overlap to understand the relationship between the parameters and cutting shapes. Finally, a probe measurement was used to measure the resistance value to complete the laser trimming process.

並列關鍵字

Laser Trimming ； Conductive Carbon Black ； Screen Printing ； Stencil Printing

參考文獻

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