Patent ID: 6122479
Filing Date: 2000-09-19
Classification: G03G,H05B,Y10T

Abstract:
A heat roller using a direct heating system, comprising:a hollow cylindrical base;a parting layer; anda heating layer comprising a heating body constituted by strip-like fibers, said heating body extending linearly or helically;wherein a resistance R of said heating body and a heating area W.multidot.L of said heating layer for implementing desired power consumption are expressed as:R=Rs.multidot.L/W[W.multidot.L=2.pi.Rl]W.multidot.L=2.pi.rlwhere Rs, L and W respectively denote a surface resistance, a length and a width of said heating body, .pi. denotes a ratio of a circumference of a circle to a diameter, r denotes a radius of said heating layer, and l denotes a length of said heating layer in an axial direction of said heat roller.