How to deal with the problem of poor contact when touching the switch lightly? Here we will give you a detailed introduction in this respect.
The light touch switch is widely used, and the demand in the market is increasing gradually. Consumers are always choosing brands and pursuing quality when buying. They are afraid that the switch will be prone to problems in the future. It is not difficult to understand that this small component controls the on-off work of your household appliances and sometimes determines the service life of the appliances. In fact, for touch switch, poor contact is one of the most common problems for consumers. What are the causes of poor contact of touch switch? The technology of the touch switch manufacturer tells you the reasons why the contact is not good.
1. Metal surface oxidation and impurities, resulting in poor contact.
Metals exposed to air are vulnerable to different degrees of oxidation, some of which we can not see with the naked eye. The degree of oxidation is closely related to metal materials, environmental conditions and storage time. After oxidation, a layer of oxide will be distributed on the metal surface, while the metal oxide is non-conductive. These oxide layers further reduce the actual effective contact surface and make two joints. When the contact surface contacts, it is actually the dog teeth interlaced contact between the uneven surfaces, which reduces the contact area and leads to poor contact. If the switch is disassembled, we find that there will be a small black spot on the shrapnel. This small black spot is the effect of the shrapnel being oxidized. Star Kun manufacturer suggests that the electronic products not used in ordinary times should be placed in a dry place to prevent the electronic components from being oxidized.
2. The internal break of the light touch switch device causes poor contact.
Some lightly touched switch devices are broken, but the sections are still touched together, which is still conductive from the outside, but the contact time is usually unreliable. If the section is enlarged, we will observe a lot of bumps and bumps. When re-contacted, there is a slight displacement, these bumps and bumps can not match as they did when they were broken, so the contact area will be different. The pressure between the surfaces is also very small. This kind of surface contact is good. When the external action reaches a certain degree, it will be completely disconnected one day.
3. The thermal expansion and contraction between lightly touched switch devices result in poor contact.
The change of temperature in the external environment of the switch or the heating of the appliances themselves causes the change of internal temperature of the appliances, which causes the thermal expansion and contraction between the lightly touched switching devices, thus affecting the contact surface and causing the force or deformation of the contacts. This reason is easy to overlook. We often think that we have not operated the switch excessively. In fact, this external cause will quietly affect the contact surface, resulting in poor contact of the switch.