How to Select a Light Touch Switch
Release time：2018-12-25 Clicks： Click
Faced with this kind of light touch switch, how should we choose, what is the specific method of selection, the following gives you a detailed introduction.
The key factors affecting the quality of light touch switch are the protection, solderability, reliability of conduction, life, handle, production process and installation size of light touch switch. The first factor is pin base material. The pin base material of light touch switch is brass or phosphorus copper (low grade is iron). In order to reduce contact resistance, pins are basically silver plated and treated in silver-encounter air. The SO2 gas will oxidize, which directly affects the solderability and contact resistance of the switch. Therefore, the high quality light touch switch should be controlled in the silver plating thickness of the pin base material and the silver plating process. The order of silver plating on the market is as follows:
Silver plating thickness: 0.3um or more (silver), 0.2um (thin silver), 0.1um (white)
Silver plating process: nickel pre-plating and silver re-plating on the substrate, copper pre-plating and silver re-plating on the substrate, and direct silver plating on the substrate
Whether the protective agent treatment is carried out after silver plating on the substrate or whether the switch has the function of dust-proof and waterproof is very important, otherwise, even the best silver plating treatment, the switch will be oxidized.
Secondly, the key factor affecting the reliability of conduction is the structure of contact point. Because the function of touch switch is contact point and shrapnel conduction, the larger the contact surface is, the better the contact surface is. The contact surface is determined by the structure. There are probably three types of structures in the market. The order of advantages and disadvantages is as follows:
Bubble (crater type) "O contact", grooved type "2 contact" and flat bubble type "1 contact"
Thirdly, life and feel are determined by the stroke of the light touch switch and the cooperation of the shrapnel. The shorter the stroke, the lighter the sound, the longer the lifetime. On the contrary, under the fixed shrapnel technology, the lifetime of the light touch switch is mainly determined by the stroke or sound.
In addition, the key factor to determine the life of shrapnel is stamping technology. The stamping technology in Japan and Taiwan is very popular in China. Therefore, in the case of technological upgrading, whether the requirements for imported materials will be further reduced, such as 160gf shrapnel life, there are four main types in the market.
About 50,000 times (domestic phosphorus copper or relatively backward stamping technology), about 100,000 times, more than 200,000 times (stainless steel)
Fourth is the production process. The assembly process will ultimately affect the quality of the products after having the accessories. The assembly process depends on the management ability of the production company, the quality consciousness of the employees and the quality assurance ability. The final product quality will certainly be different with different assurance abilities. The market assembly method includes manual and machine. The machine assembly cost is low, but the product quality is low and the cost of manual assembly is low. High quality but high quality.
Fifth, factory inspection, the methods and items of factory inspection also affect the quality of the final light touch switch, such as appearance, feel, conduction, resistance and other items are spot inspection or full inspection, such as the rejection rate required by some large factories is measured by PPM or zero defect, it is necessary to set up spot inspection or quality inspection after factory inspection.