Patent ID: 7726972

Claim:
A rotary connector apparatus comprising: first and second electronic modules rotatable with respect to each other; a rotary connector mechanism having a first portion with a first pair of terminals that are electrically coupled to said first electronic module, a second portion nested within said first portion and having a second pair of terminals that are electrically coupled to said second electronic module, and a captured liquid metal for electrically coupling said first pair of terminals to said second pair of terminals so as to establish a common ground potential between said first and second electronic modules and a power line through which power is supplied from one of said first and second electronic modules to the other, where said liquid metal is an alloy comprising the elements Gallium, indium, Tin, and Zinc in a concentration range of 2% to 10%; a first transmitter in said first electronic module for transmitting data to said second electronic module by modulating a voltage of said power line with respect to said common ground; and a second transmitter in said second electronic module for transmitting data to said first electronic module by modulating a current in said power line.