What are the structural principles of the tact switch?

- Aug 24, 2018 -

What are the structural principles of the tact switch?

 

Right Angle Tactile Switch.jpgThe tact switch is continuously improved and the requirements of the function are continuously improved, but the essential structural principle is unchanged. The structure of the button tact switch is generally composed of a button cap, a return spring, a bridge movable contact, a static contact, and a pillar connection. The rod and the outer casing are composed of parts.


The contact substrate of the tact switch is brass or phosphor bronze. In order to reduce the contact resistance, the pin is substantially silver plated, and the silver dioxide in the air will oxidize, which directly affects the solderability and contact resistance of the switch. Therefore, the high-quality tactile switch must first be controlled in place on the silver plating thickness of the substrate and the silver plating process. The key factor affecting the reliability of the conduction 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 contact surface of the contact point is as large as possible, and the contact surface is determined by the structure to determine the life and feel. The stroke of the switch and the cooperation of the shrapnel are determined, the shorter the stroke, the lighter the sound, the longer the life, and the longer the stroke, the opposite. In the case of a fixed shrapnel, the stroke or sound is mainly determined by the life of the tact switch. In addition, the key factor in determining the life of the shrapnel is stamping technology.


A good tact switch is also important for the life of the entire product. Just like a computer keyboard, a remote control, and so on. If it is a poor quality tact switch, after frequent touches, the metal shrapnel will lose its elasticity and fail. Therefore, the selection of the tact switch is a concern. Determining the quality of the light touch switch directly affects the factors, mainly depending on the feel of the touch switch, protection, solderability, life, continuity reliability, production technology and other factors.