Shenzhen Xinjiejia Electronic Membrane Switch Co., Ltd. is a professional manufacturer integrating R&D, production and sales of membrane switches and membrane panels . The company introduces advanced membrane switch production technology from abroad , and is committed to the core materials and processes of electronic components. , structural research and development, and achieved fruitful results. Now let's explain the production of the membrane switch circuit screen . Â
　　 The circuit is the most important factor in evaluating the intrinsic quality of the membrane switch. The circuit should be subject to parameters such as current, resistance, withstand voltage, insulation, and life. This is why the screen printing products penetrate into the multifunctional and high-tech fields. Concrete manifestation. To ensure the function of the circuit, the quality of the screen of the printed silver paste circuit should first be guaranteed.
Before making a circuit screen, first consider the circuit parameters and the requirements of the structural elements in the circuit for screen production.
1 The thickness of the conductive pattern The size of the resistance of the wire made of the same conductor is inversely proportional to the cross-sectional area of ​​the wire. The current passing through is proportional to the cross-sectional area. It can be seen that the thickness of the circuit pattern printed by the membrane switch is to ensure the performance of the switch. Basic conditions. Therefore, in the process of making the screen, it is necessary to select a suitable thickness of the screen layer to ensure sufficient conductor circuit pattern. 2 The life of the conductive pattern The conductive pattern has sufficient thickness, which not only provides favorable conditions for the passage of current and the decrease of resistance, but also improves the high wear resistance of the switch contacts in the pattern.
3 On the metal silver contact of the membrane switch, the conductive carbon paste protective layer should be screen printed. Due to the physical properties of the carbon paste layer, the following effects can be formed: The carbon paste is a non-metallic conductor that does not oxidize with air, thereby protecting the underlying metal silver contact from oxidation; carbon has a small coefficient of friction and is a kind Solid lubricant, when it acts on the switch contacts, facilitates rapid separation after contact closure; carbon has high wear resistance, can improve the wear resistance of the switch contacts, and ensure that the switch contacts can withstand the number Millions of contacts; dense carbon coating can hinder the migration of silver ions, thus effectively protecting the electrical stability of the switch; when the carbon coating acts on the lead socket, it can facilitate the insertion and removal of the lead and the wiring terminal. Since the excessively thick carbon coating tends to be peeled off, the screen of the printed conductive carbon paste should not be too thick.
â‘£ The thickness of the conductive pattern density of the conductive pattern, although the foundation switching performance parameters, but the membrane switch printed circuit conductor pattern is made of metal (usually silver particles) particles gathered together in its printed material ( In the silver paste ) , the barrier between the resin connection to the particles, the barrier of the impurities to the conductor particles, and the barrier of the wire mesh to the metal particles during the screen printing process, etc., all affect the compactness of the conductor pattern, thereby affecting The performance of electrical parameters. For the above reasons, in order to allow the conductive printing materials, especially the silver flakes in the silver paste to pass smoothly, it is necessary to select a screen with a slightly lower mesh size, and the wire diameter is required to be finer and the hole width is relatively large.
5 The smoothness of the conductive pattern The uncleanness of the circuit pattern refers to the sharpness of the edge. It is not only for the appearance of the consideration, but more importantly, the influence on the electrical parameters. Unclean wires may cause the edge impedance of adjacent wires to drop, especially in high temperature and high humidity situations, which may cause silver ions to migrate along the edge of the wire to cause silver ion migration, resulting in short circuit between lines and failure of the membrane switch . For more information on membrane switches and membrane panels , please click: http:// Â
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