Patent ID: 9318238
Filing Date: 2016-04-19
CPC Classification: H01B

Claim Text:
1. A hollow core body for signal transmission cable comprising an inner conductor comprised of a bunched conductor formed by bunching plural strands; and a hollow insulating core that includes an inner annular member that surrounds the inner conductor, plural rib members that radially extend from the inner annular member, an outer annular member that couples outer ends of the rib members, and plural hollow spaces that are enclosed by the inner annular member, the rib members, and the outer annular member, wherein the inner conductor is a compressed bunched conductor configured so as to suppress formation of a recesses on the circumferential surface of the compressed bunched conductor, thereby improving evenness of the thickness of the inner annular member, by being formed by bunching plural strands and compressing the bunched strands such that a cross-section of the compressed assembly is substantially circular or substantially polygonal having a number of angles the same as or larger than a number of the rib members, and wherein a relation between a first thickness (T1) of a thinnest portion of the inner annular member, a second thickness (T2) of the rib members, and a third thickness (T3) of the outer annular member is T1<T3<T2.