FIXING DEVICE AND IMAGE FORMING APPARATUS PROVIDED THEREWITH

摘要

A fixing device includes: a heat source, a heating member, a pressure member, a heat absorption unit, a holding member, and an end part supporting member. The heat source generates infrared rays. The heat absorption unit is formed on an inner circumferential surface of the heating member, absorbs radiation heat of the heat source, and opposes an outer circumferential part of the holding member with a gap. The holding member has a hollow and cylindrical shape, and arranged between the heat source and the inner circumferential surface of the heat member, permits transmission of infrared rays therethrough, and has heat resistance. The end part supporting member supports the holding member at both axial end parts of the heating member. The outer circumferential part of the holding member, the inner circumferential surface of the heating member, and the end part supporting member form a sealing space sealing the heat absorption unit.

主权项

1. A fixing device comprising:
a heat source generating infrared rays; a heating member being heated by the built-in heat source; a pressure member being brought into pressure-contact with the heating member and forming, with the hating member in-between, a nip part thermally fixing a non-fixed toner image on a recording medium carrying the non-fixed toner image; a heat absorption unit being formed on an inner circumferential surface of the heating member and absorbing radiation heat of the heat source; a holding member having a hollow and cylindrical shape, and being arranged between the heat source and the inner circumferential surface of the heat member, the holding member permitting transmission of infrared rays therethrough and having heat resistance; and an end part supporting member supporting the holding member at both axial end parts of the heating member, wherein the heat source is disposed at a hollow part of the holding member, the heat absorption unit opposes an outer circumferential part of the holding member at a gap in-between, and the outer circumferential part of the holding member, the inner circumferential surface of the heating member, and the end part supporting member form a sealing space sealing the heat absorption unit.