Electrical connection between an external power supply and a heater for a fusing roller hermetically sealed within the fusing roller used in an electrophotographic image formation apparatus

摘要

A fusing roller having an electrical connection between the heater and the external power supply of an electrophotographic image formation apparatus is provided. The fusing roller having an electrical connection between the heater and the external power supply includes an electrically insulating cap and a conductive slip ring installed near the cap. The slip ring is supplied with current from an external power supply and transmits the current to a heater disposed within a hermetically sealed fusing roller by a pair of conducting caps. Due to such a structure, durability and safety can be considerably improved against many stresses such as an electrical current stress, a mechanical residual heat stress and a thermal shock according when an electrical connection between the heater and the external power supply of a fusing roller is employed.