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当导电橡胶作为按键,而印制板上部分线路作触点时,就可以使运算、通话、弹奏等功能发挥出来。本文仅就为如何保证触点的正常工作,选择可靠的表面涂覆,从而提高整机的社会效益和经济效益,作如下叙述: 一、印制线路触点上表面涂覆的选择: 触点本身要求表面清洁、无污点及氧化层,要始终保持良好的导电性能,从而保证各类产品的工作性能。根据国外资料和国内常用的表面涂覆,多采用价格很贵的金,这是因为其具有良好的导电性、化学结构稳定,不易氧化。但因其价贵不易被采用。在国外目前大量采用导电油墨来代替电镀。这种以石墨为导电体的导电油墨国内正处于研制中,由于导阻值偏高,重叠漏印性能不理想,粘接
When the conductive rubber as a key, while the printed circuit board as part of the line contact, you can make computing, call, play and other functions play out. This article only on how to ensure the normal contact operation, the choice of reliable surface coating, thereby enhancing the social and economic benefits of the machine, as described below: First, printed circuit contact surface coating options: contact Itself requires a clean surface, no stains and oxide layer, to always maintain good electrical conductivity, thus ensuring the performance of various products. According to foreign materials and domestic commonly used surface coating, the more expensive gold, because of its good conductivity, chemical structure and stability, not easy to oxidation. However, its price is not easy to adopt. In foreign countries extensive use of conductive ink instead of plating. This kind of conductive ink with graphite as conductor is under development in our country. Due to the high conduction resistance, the performance of overlapped offset printing is not satisfactory,