FUSING DEVICE AND IMAGE FORMING DEVICE COMPRISING THE SAME

摘要

A fusing device with improved fusing performance to obtain superior gloss and gloss uniformity. The fusing device includes at least one heat source to generate heat, a fusing belt disposed near the heat source, a rotation unit contacting an outer circumference of the fusing belt, at least one pressurization unit pressed toward the rotation unit such that a fusing nip is formed between the fusing belt and the rotation unit, a heat conductor contacting an inner surface of the fusing belt to conduct heat to the fusing nip, and an intermediate unit disposed between the pressurization unit and the heat conductor to prevent transmission of heat from the heat conductor to the pressurization unit.

主权项

1. A fusing device comprising:
at least one heat source to generate heat; a fusing belt disposed near the heat source; a rotation unit contacting an outer circumference of the fusing belt; at least one pressurization unit to press toward the rotation unit such that a fusing nip is formed between the fusing belt and the rotation unit; a heat conductor contacting an inner surface of the fusing belt to conduct heat to the fusing nip; and an intermediate unit disposed between the pressurization unit and the heat conductor to prevent transmission of heat from the heat conductor to the pressurization unit, wherein a difference in height CRN_M between a central part of the intermediate unit and each of both ends of the intermediate unit satisfies the following equation:
δ1+δ2≦CRN—M≦δ1+δ2+CRN—R wherein δ1 represents a flexural level of each of both ends of the pressurization unit, when a pressure is applied to the pressurization unit; δ2 represents a flexural level of each of both ends of the rotation unit, when a pressure is applied to the pressurization unit; and CRN_R represents R2−R1 indicating a difference between a distance R1 between the rotation center of the rotation unit and the central part of the rotation unit, and a distance R2 between the rotation center of the rotation unit and the end of the rotation unit.