The quality of tapping the switch requires us to choose professionally. At the same time, we should also have good selection methods. For laymen, these methods will not work, but for professionals, they are different.
The key factors affecting the quality of light touch switch are the touch, solderability, reliability of conduction, protection, life, production process and installation size of light touch switch. Specifically, we divide the selection method of touch switch into the following four points:
Selection method of light touch switch 1. Production process, after having accessories, the final quality is the assembly process. The assembly process depends on the management ability of the production company, the quality awareness of employees and the quality assurance ability. The final product quality of different assurance capabilities is definitely different. The market assembly methods are artificial and machine, and the machine assembly cost is low, but the product quality is low. The cost of manual assembly is high, but the quality is also high. Fifth, factory inspection, the methods and items of factory inspection also affect the quality of the final touch switch.
Selection method of light touch switch 2, life and feel are determined by the stroke of light touch switch and the matching of shrapnel. The shorter the stroke, the lighter the sound, the longer the travel, on the contrary, in the case of fixed shrapnel technology, the life of light touch switch is mainly determined by travel or sound. Secondly, the key factor determining the life of shrapnel is stamping technology. The stamping technology in Japan and Taiwan is in China. It has been quite popular, so in the case of technological upgrading, whether the requirements for imported materials will be further reduced, such as 160gf shrapnel life in the market is mainly about four kinds of 50,000 times (domestic phosphorus-copper or relatively backward stamping technology), about 100,000 times, more than 200,000 times (stainless steel).
Selection method of light touch switch 3. The key influencing factor of conduction reliability is the structure of contact point. Because the function of light touch switch is contact point and shrapnel conduction, the bigger the contact surface is, the better the contact surface is. The contact surface is determined by structure. There are three kinds of structures in the market. The order of advantages and disadvantages is as follows: Bubble (crater type) "O-type contact", "slotted type" 2-point contact"and flat bubble. Type "1 point contact".
Selection method of light touch switch 4. Pin base material, lead base material of light touch switch is brass or phosphorus copper (low grade is iron). In order to reduce contact resistance, pin is basically silver plated. SO2 gas in silver encounter air oxidizes, which directly affects solderability and contact resistance of switch. Therefore, high quality light touch switch should first be silver plated thickness of pin base material and silver plating process. With the control in place, the order of silver plating on the market is as follows:
Silver plating thickness: 0.3 um or more (silver), 0.2 um (thin silver), 0.1 um (white).
Silver plating process: base material pre-plated nickel and silver, base material pre-plated copper and silver, base material directly silver-plated base material after silver plating whether there is protective agent treatment or whether the switch has dust-proof and waterproof function is very critical, otherwise even the best silver plating treatment, the switch will be oxidized.
The light touch switch, also known as the key switch, first appeared in Japan when it was used to satisfy the conditions of operation force and close the pressure switch function in the direction of operation. When the pressure was withdrawn, the switch was disconnected, and its internal structure was realized by the force change of the metal elastic fragments. So after knowing the selection method of touch switch, we should also know how to use touch switch correctly.
We are very professional in the selection of light-touch switches, and we will take it seriously.
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