What should we pay attention to when choosing lightly touched switches? Why is it that some people can buy good lightly touched switches? Others can not pick good lightly touched switches? So selection is very important. Today, I will introduce the selection rules of lightly touched switches.
How to select the light touch switch:
1. Contacts depend on size (the bigger the better). At present, there are three main types of contacts: silver-nickel alloy, silver-cadmium alloy and pure silver. Silver-nickel alloy is an ideal contact material at present. It has good electrical conductivity, hardness and is not easy to oxidize and rust.
Second, the contact depends on the material. Touch switch housing material lightly. The main switch brands in the market generally choose PC materials. The characteristics of impact resistance, high temperature resistance and non-discoloration are very important for the control of electrical switches. The front panel and the back base of the light touch switch are made of PC material.
The selection and identification of light touch switch depends on the factors such as protection, solderability, reliability of conduction, life, handle, production process and installation size.
Following is a detailed description of how to select the light touch switch.
1. For the pin base material, the pin base material of the light touch switch is brass or phosphorus copper (low grade is iron). In order to reduce the contact resistance, the pin is basically silver plated. SO2 gas in the silver meets the air will oxidize, which directly affects the solderability and contact resistance of the switch. Therefore, the high quality light touch switch should first control the thickness of silver plated pin base material and silver plating process. The order of silver plating is as follows: silver plating thickness: 0.3um or more (thick silver), 0.2um (thin silver), 0.1um (white) silver plating process: nickel pre-plating and silver plating on the substrate, copper pre-plating and silver plating on the substrate, silver direct silver plating on the substrate, whether there is protective agent treatment or whether the switch has dust-proof and waterproof function is very important, otherwise even the best silver plating treatment, the switch will be oxidized.
2. The key factor affecting the reliability of conduction is the structure of contact point, because the function of touch switch is contact conduction between contact point and shrapnel. The larger the contact point 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-type contact", "grooved type" 2-point contact"and flat foam type"1-point contact".
3. Life and feel are determined by the stroke of the flip-flop switch and the cooperation of the shrapnel. The shorter the stroke, the lighter the sound, and the longer the life. On the contrary, in the case of fixed shrapnel technology, the life of the flip-flop switch depends mainly on the stroke or sound.
These are the points that need to be paid attention to when selecting the light touch switch. When we pay attention to the selection rules of the light touch switch in these aspects, it means that we can pick out the good light touch switch.
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