Fusing device of electrophotographic image forming apparatus

A fusing device of an electrophotographic image forming apparatus comprising:

• a fusing roller comprising:
• a tubular internal pipe sealed to maintain a predetermined internal pressure and having an inner space to accommodate a predetermined amount of a working fluid,
• a heater formed around the internal pipe to generate heat and having a lead formed on an end of the heater, and
• a cylindrical roller formed on the heater;
• a power supply unit having an electrode to supply an external power to the heater through the lead;
• and
• an end cap having a first portion connected to the electrode of the power supply unit, a second portion fixedly coupled to an end of the cylindrical roller, and a hole formed on the second portion to communicate with the first portion of the end cap and to allow the electrode and the lead of the heater to be connected to each other.

A fusing device of an electrophotographic image forming apparatus comprising:

• a fusing roller comprising:
• a tubular internal pipe sealed to maintain a predetermined internal pressure and having an inner space to accommodate a predetermined amount of a working fluid,
• a heater formed around the internal pipe to generate heat and having a plurality of leads formed on both ends of the heater, and
• a cylindrical roller formed on the heater;
• a plurality of power supply units each having an electrode to supply an external power to the heater;
• a plurality of end caps each having a first portion connected to the electrode, a second portion fixedly coupled to an end of the cylindrical roller, and a hole formed on the second portion to communicate with the first portion of the end cap and to allow the electrode and the lead to be connected to each other;
• a gear formed on one of the end caps and coupled to a rotation power source to rotate the fusing roller;
• and
• a locking unit connecting the second portion of the end cap to the end of the cylindrical roller.