The connector was inspired by fighter jet manufacturing technology. Aircraft in battle must be refueled and repaired on the ground, but the longer they stay on the ground the greater the threat to fighters. Therefore, in the Second World War, the United States army in order to shorten the ground maintenance time, and will be a variety of control instruments and parts of the unit, and then by the connector into a complete system.

After the war, AT&T Bell LABS successfully developed the Bell telephone system. Subsequently, the rapid rise of computer connectors, information transmission and other industries, resulting in a large market for connectors derived from fighter aircraft technology.

A general connector consists of two main parts:Plastics and terminals

• Plastic mainly acts as insulation and positioning terminals;

• Terminal is the core part of the connector, the main role is to conduct;

• In addition, some connectors have PWB board, shrapnel, Cover and other components depending on the structure and function requirements.

  
   

1、Connector part class class, also known as interconnection level. In 1989, by the United States national Electronic Distribution Association (NEDA) and the production of connector manufacturers together to develop a connector classification standards and terminology.

• Levels0：The internal connection of the chip package is level 0, which is the integrated circuit chip

• Levels1：IC package pin and PCB connection.

• Levels2：The connection of a printed circuit to a wire or printed board.

• Levels3：Connection between a bottom plate and a bottom plate.

• Levels4：The connection between devices.

   

2、The connector product type division is somewhat confusing, but technically there are only two basic ways to classify connector product categories:

• According to shape: round connector, rectangular connector, straight connector, bent connector, etc.

• According to the frequency of use: high frequency connector, low frequency connector, high and low frequency mixed connector, etc.

Other classification

According to environmental conditions, it can be classified as:

• Sealed connector, radiation resistant connector, high temperature connector, low temperature connector, etc.

According to installation mode, it can be classified as:

• Cable connector, panel connector, through-wall connector, etc.

According to electrical requirements, it can be classified as:

• General connector, high power connector, high voltage connector, pulse connector, low noise connector, anti-interference filter connector, phase modulation connector, precision coaxial connector, etc.

According to the special structure, it can be classified as:

• Special structure of connectors are element plug force connector, rubber connector, rotary connector, separation - off connector and optical fiber connector, etc.

   

3、Level of connector specifications

According to the International Electrotechnical Commission (IEC) classification, connectors are electrical and mechanical components for electronic equipment, and their specification levels are:

•  门类（family）Example: Connectors

• 分门类（sub-family）Example: circular connector

• 类型（type）Example: YB circular connector

• 品种（style）Example: YB3470 specification

   

Connector industry upstream for a variety of metal materials, plastic materials and other materials manufacturing; Downstream for computer and peripheral equipment, automotive, communications, aerospace and military, consumer electronics, medical and other industries.

The upstream industry of connector products is mainly the raw and auxiliary materials for the manufacture of connectors, including metal materials, plastic materials, electroplating materials, etc. Metal materials account for the largest proportion of the cost, followed by plastic materials, electroplating materials. Metal materials are mainly used to make connector terminals.

Stamping, the manufacturing process of electronic connectors generally begins with stamping pins. Electronic connectors (pins) are stamped from thin metal strips by large, high-speed presses. One end of a large roll of metal belt is fed into the front end of the punch machine, and the other end is wound into the roll belt wheel through the hydraulic table of the punch machine, and the roll belt wheel pulls out the metal belt and rolls out the finished product.

Electroplating, connector pin stamping should be sent to electroplating section. At this stage, the connector's electronic contact surface is coated with various metal coatings. Similar to the stamping stage, such as the distortion, fragmentation or deformation of the pin, will also occur in the process of the stamped pin into the electroplating equipment.

Injection molding, the plastic box holder for the electronic connector is made in the injection molding stage. The usual process involves injecting molten plastic into metal membranes, which are then quickly cooled to form. When the molten plastic is not fully filled with the tire film, the so-called "leakage? quot;  Short Shots, which is a typical defect that needs to be tested during injection molding. Other defects include filling or partial blockage of the jack (which must be kept clean and unblocked for proper insertion of the pin during final assembly). The machine vision system used for quality inspection after injection molding is relatively simple because the backlight can easily identify box seat leaks and plug plugs.

Assembly, the final stage of electronic connector manufacturing is finished assembly. There are two ways to connect and plug the electroplated pins with the injection box seat: single plug or combined plug. Separate insertion refers to each insertion of a pin; The combination of a plurality of pins at the same time with the box seat. Regardless of the insertion method, the manufacturer requires that all pins be tested at the assembly stage for leaks and correct positioning; Another kind of routine inspection task is related to the measurement of the spacing on the mating surface of the connector. As with the stamping stage, the assembly of the connector also presents a challenge to the automatic detection system in terms of detection speed. While most assembly lines have one or two beats per second, the vision system typically performs several different inspections for each connector that passes through the camera. So detection speed becomes an important system performance index again.