In our J-contacts, we adopt an original rigid-type (integral) contactor, not a pogo pin-type contactor often used in a burn-in socket. This enables us to have the shorter length of the contactor than a conventional one and thus to provide a socket with excellent electric characteristics and in particular high-frequency characteristics. The contactor in our J-contacts also makes smooth rotation movement, which achieves ideal contact, preventing the device and the DUT board from being damaged. We have filed a patent application for this technique in various countries, and the patent has already been granted.

Fig.1; Comparison between pogo pin and J-contacts

Fig.2; Enlarged outline view of the upper surface of J-contacts

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