Touch switch the main factors that affect the good or bad, the key touch switch is protective, solderability, conduction reliability, life expectancy, feel, production process and installation dimensions and other factors to determine the first pin substrate, touch Switch pin substrate for the brass or phosphor bronze (low-grade iron), in order to reduce the contact resistance, the basic silver-plated pins deal with silver oxide gas in the air will be oxidized, a direct impact on the switch can be soldered Sexual and contact resistance, so high-quality touch switch first of all in the pin substrate silver plating thickness and silver plating process control in place, the market silver plating sequence of advantages and disadvantages are as follows:
Silver thickness: 0.3um above (after silver), 0.2um (thin silver), 0.1um (white)
Silver plating process: pre-nickel substrate and then silver, substrate pre-plated copper and then silver, silver plated substrate directly
Whether or not the protective agent is treated after the silver plating of the substrate or whether the switch has the function of dust and water proof is crucial, otherwise the switch will be oxidized even though the silver plating is the best.
Second, the key influencing factor of conduction reliability is the structure of the contact point. Because the function of the tact switch is that the contact point and the shrapnel are in contact with each other, the larger the contact area of ​​the contact point, the better the contact area is determined by the structure. There are about three Class structure, the order of advantages and disadvantages are as follows:
Bulb (crater type) "O-type contact", slotted type "2:00 contact", flat bubble type "1 point contact"
Third, the life expectancy and feel touch switch is the trip and shrapnel with the decision, the shorter the shorter the sound the longer the longer life expectancy, the longer the journey On the contrary, in the case of fixed shrapnel, the main trip or sound decision light Touch the life of the switch;
In addition, the key factor in determining the life of the shrapnel or stamping technology, Japan and Taiwan's stamping technology is already very popular in the country, so the technology upgrade, the material requirements of imported materials and then reduce, such as 160gf shrapnel life in the market is mainly Four kinds of 50,000 times (domestic phosphor bronze or more backward stamping technology), about 100,000 times, more than 200,000 times (stainless steel)
The fourth is the production process, with accessories after the final impact on the quality of the assembly process, the assembly process depends on the management ability of production companies, staff quality awareness and quality assurance capabilities and other factors, different assurance ability to come out of the final product quality must be different, Market assembly methods are manual and machine, machine assembly costs low, but the product quality is low, the cost of manual assembly is high but the quality is also high.
The fifth is the factory inspection, factory inspection methods and projects also affect the quality of the final touch switch, such as appearance, feel, conduction, resistance and other items is sampling or inspection, such as some manufacturers require scrap rate is PPM Measured or zero defect, it is necessary to set the factory inspection after the full inspection but also set sampling or quality inspection and other processes.