In the connector, the contact form of the jack will directly determine the interconnection quality and production cost of the connector. At present, the mainstream jack structures in the industry include leaf spring, wire spring and coil spring. The form of contact between terminals and terminals is generally divided into three categories: point contact, line contact and surface contact.
(1) Leaf spring contacts
The socket of the leaf spring contact piece is a crown spring hole, and a leaf spring ring is arranged in the socket, each leaf spring ring is composed of a plurality of spring pieces, and all the spring pieces are arched inward. An elastic spring ring is formed. When the socket and the pin are matched, each spring piece is in contact with the pin and produces a squeezing force to ensure stable contact at multiple points.
The leaf spring contact is a traditional contact technology with simple process and flexible design. The flat design makes the terminal assembly occupy a small space, thereby reducing the overall size of the connector and reducing the requirements for assembly space.
(2) Wire spring contacts
The wire spring jack is composed of a plurality of elastic gold-plated or silver-plated metal wires, which are arranged according to the straight busbar of the single-leaf rotary hyperboloid, and form an angle with the inner sleeve straight busbar. After the pin is inserted, the wire spring wraps the pin tightly to form a line contact. The advantages of the wire spring type jack are that the contact resistance is small, the insertion force is soft, the service life is long, and it is resistant to vibration and impact, but the process is complicated, the cost is also high, and the volume is relatively large.
(3) Coil Contact
There are leaf springs in the spring coil contacts, which have more than 40 contact points with the female terminal, which fully guarantees the contact between the terminals. The contact resistance of the reed contact is small, the current carrying capacity is high, and the internal heat is low. Due to the characteristics of the deformation of the reed, it can ensure high contact effectiveness under different working conditions, and has a good degree of high deviation compensation. In addition, the coil contact piece requires less internal space and is easy to assemble. However, the processing technology of the coil contact is difficult and the cost is high, and it is generally suitable for circular terminals.
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