Spring pin, also known as pogopin spring thimble, is a new type of precision connecting element. It has the advantages of small size, light weight, reliable contact, stable performance, etc. It is widely used in electronics, communications, medical, aerospace and other fields. In this article, we will introduce the working principle, structural characteristics, performance advantages and application areas of pogopin in detail. Second, the structure of the spring needle spring needle is mainly composed of three basic components: needle shaft, spring, needle tube. 1. needle shaft The needle shaft is the core component of the spring needle, usually made of copper, stainless steel and other conductive materials. The head of the needle shaft is usually designed as a conical or spherical shape, in order to make good contact with the target object. The end of the shaft is usually connected to a wire to transmit an electrical signal or current. 2. Spring The spring is the key component of a spring-loaded needle, which is usually made of materials such as stainless steel and piano wire. The function of the spring is to provide the elasticity that allows the needle shaft to maintain a certain pressure when in contact with the target object, thus ensuring good contact performance. The coefficient of elasticity and compression of the spring determines the contact pressure and stroke of the spring-loaded needle. 3. Needle tube The needle tube is usually made of conductive materials such as copper and stainless steel, and its function is to protect the needle shaft and the spring, as well as to act as a guide and fixation. The inner wall of the needle tube is usually designed as a smooth cylindrical surface so that the needle shaft can slide freely in it. The end of the needle tube is usually connected to the printed circuit board or other connecting parts for fixing the spring needle. Third, the working principle of spring needles Spring needles work by connecting and disconnecting through the expansion and contraction of a spring. When the tip of the spring-loaded needle comes into contact with the target object, the spring is compressed and the needle moves inward, making electrical contact between the needle shaft and the needle tube, thus realising the connection of the circuit. When the pressure applied to the spring-loaded needle disappears, the spring returns to its original state, the needle moves outward, the electrical contact between the needle shaft and the needle tube is broken, and the circuit is disconnected.

Specifically, the working process of the spring-loaded needle can be divided into the following steps: 1. Contact phase When the needle of the spring-loaded needle comes into contact with the target object, due to the elasticity of the spring, the needle exerts a certain pressure on the target object. This pressure ensures a good contact between the needle and the target object, thus enabling the transmission of electrical signals or currents. 2. Compression phase As the contact pressure between the needle and the target object gradually increases, the spring begins to be compressed. The amount of compression of the spring is directly proportional to the contact pressure, and when the contact pressure reaches a certain value, the amount of compression of the spring also reaches a larger value. At this time, the electrical contact between the needle shaft and the needle tube is the closest, and the connection performance of the circuit is better. 3. Holding phase When the needle of a spring-loaded needle is kept in contact with the target object, the elasticity of the spring causes the needle to always exert a certain pressure on the target object. This pressure ensures that the connection of the circuit is stable and reliable and will not be disconnected due to external vibration or interference. 4. Separation Phase When it is time to disconnect the spring-loaded needle from the target object, the pressure exerted on the spring-loaded needle gradually decreases. As the pressure decreases, the spring begins to return to its original shape and the needle moves outward. When the needle is completely separated from the target object, the spring returns to its initial state, the electrical contact between the needle shaft and the needle tube is broken, and the circuit is disconnected. IV. Performance Advantages of Spring Needles 1. Small Size and Light Weight Spring needles are usually very small in size and light in weight, which gives them a great advantage in electronic devices with strict space and weight requirements. For example, in portable devices such as smartphones and tablets, spring pins allow for efficient charging and data transfer without adding too much bulk and weight. 2. Reliable contact and stable performance Spring pins use the expansion and contraction of a spring to make and break connections, a connection that has the advantage of reliable contact and stable performance. The elasticity of the spring ensures that a certain pressure is always maintained between the needle and the target object, thus achieving good contact performance. At the same time, the simple structure of the spring needle is not easily affected by the external environment, so it has high reliability and stability. 3. High-speed transmission, low impedance Spring-loaded needle can support high-speed data transmission, its transmission speed can reach tens of Gbps or even higher. At the same time, the impedance of the spring needle is very low, can effectively reduce the signal attenuation and distortion, improve the quality of signal transmission. 4. Waterproof, dustproof, corrosion-resistant Many spring-loaded pins are waterproof, dustproof and corrosion-resistant, which makes them work well in harsh environments such as outdoors and humidity. For example, in wearable devices such as sports bracelets and smart watches, the waterproof and dustproof performance of spring needles can ensure the reliability and service life of the device. 5. Easy to automate production The simple structure of spring needles makes them easy to automate production, which can improve production efficiency