Patent ID: 7760851

Claim:
A device for contact-free transmission of electrical signals between a stationary part and a rotatable part that rotates relative to the stationary part, said device comprising: at least one annular circumferentially-proceeding transmitter element configured for mounting on said stationary part to transmit electrical signals; at least one receiver element configured for mounting on said rotatable part to receive the electrical signals emitted by said transmitter element; said transmitter element comprising a single conductor configured to run on a surface, said single conductor representing electrical reference ground, at least one dielectric immediately following said single conductor on said surface, and multiple conductive conductor structure pairs each being formed by two mirror-image components, mounted on said at least one dielectric, said conductor structure pairs being reciprocally and alternatingly charged with voltages of the same magnitude but opposite polarity for generating said electrical signals; and said multiple conductive conductor structure pairs including an edge conductor structure pair that includes a conductor structure closest to an edge of said reference ground, said conductor structure that is closest to an edge of said reference ground being spaced from said edge of said reference ground by a distance having a magnitude that is at least 10 mm and that is at least half of a spacing between said edge conductor structure pair and another of said conductor structure pairs nearest to said edge conductor structure pairs.