Cage Jack, Miniature spring socket,Pin receptacle

Figure 1 The compound curvature of the Cambion cage jack
connector spring gives high normal force and long term
reliability over many cycles.

Formed from beryllium copper then annealed and plated, the cage jack spring is the heart of the Cambion cage jack connector. The spring is manufactured in such a way that the holes through the body of the spring are punched from inside to out thus ensuring that any microscopic burrs that are formed during the punching process are on the outside of the spring and do not cause damage to any mating plug that is inserted into the finished connector.

The spring is formed in an hour glass shape with three individually acting leaf springs which are joined top and bottom. Each leaf has a compound curvature, the long curve, top to bottom, provides the spring action whilst the short curve around the inside of the spring conforms to the circumference of the mating pin. This second plane of curvature also has the effect of stiffening and strengthening the spring (see Figure 1 at the top of this page).

The spring is formed in this way for a variety of reasons. Firstly, the three contact leaves make contact with 60% of the circumference of the mated pin. Secondly, the hour glass shape means that there is considerable wiping of the contact area by the mating pin during insertion which ensures a clean contact area. Thirdly, reliability of connection is assured by having three individually spring loaded metal to metal contacts which provide parallel conductor paths. Failure of one due to an insulating fragment not being wiped away during insertion, or temporary open circuit due to mechanical shock will leave two parallel conductive paths and maintain a good connection.

The body of the cage jack is either formed from copper or turned from brass. Simple, low cost jack bodies are deep drawn using copper, where more complex shapes are required, bodies are turned from brass. During the assembly process the spring is inserted into the body and the outer edge of the body carefully rolled over to captivate the spring. Once this operation is complete, it is impossible to remove the spring without destroying the connector body.

Other common names for the Cambion Cage Jack are: - Micro jack socket, Micro jack connector, Pc Jack, Miniature spring socket, Crimp socket and Insulated Micro jack socket.




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