Hollow core body and its production manner for transmission cable and cable null inner conductor

摘要

PROBLEM TO BE SOLVED: To provide a hollow-core-body for transmission cables, wherein a degree of electrical hollowness is high, mechanical strength, especially side-pressure strength, is excellent, and production of the cable can be conducted with stability; a method of manufacturing the same; and a signal transmission cable.;SOLUTION: An insulation sheathing body 2 includes an inner annular section 2a, multiple rib sections 2b extending radially from this inner annular section 2a, and an outer annular section 2c that connects outer ends of the respective rib sections 2b, and is also provided with three or more void sections 2d surrounded by the inner annular section 2a, the outer annular section 2c, and each of the rib sections 2b. Each of the hollow core bodies 10, 11, has the insulation sheathing body 2 installed around a circumference of an inner conductor 1, 3, and has a thickness of the inner annular section 2a in a range of 1-4% of an outer diameter of the insulation sheathing body, and thinner than the rib sections 2b and the outer annular section 2c.;COPYRIGHT: (C)2011,JPO&INPIT