Fixing device, image forming apparatus, and heating device

Abstract

The invention discloses a fixing device, an image forming apparatus, and a heating device. The fixing device includes a heating member that includes a substrate having a substantially flat portion and a recess in a surface on one side, a heating body provided on the substantially flat portion of the substrate and that generates heat with a supply of electric current, a resistive element provided in the recess of the substrate and that is connected in series to the heating body, the resistive element having a positive temperature coefficient, and a protective layer provided over the heating body and the resistive element and that protects the heating body and the resistive element; a belt member that is heated by being in contact with the surface, on the one side, of the substrate of the heating member, the belt member being rotatable; and a pressing member that is pressed against the belt member and forms a nip part.

Description

technical field [0001] The present invention relates to a fixing device, an image forming device and a heating device. Background technique [0002] The heater according to International Publication No. 2013 / 073276 includes: a long base; a resistance heating wiring part provided on or in the base and electrically insulated from the base, the resistance heating wiring part having a plurality of parallel wirings that generate heat when energized and at least two power supply terminals for supplying electric power to the resistance heating wiring portion so as to be electrically connected to each other via the resistance heating wiring portion. The resistance heating wiring portion includes a material having a temperature resistivity of 500 to 4,400 ppm / °C. Parallel wiring includes a slanted rectangular pattern. [0003] The fixing device includes a heating member that presses and thereby heats a heating object such as a belt, fixing a toner image on a recording member define...

AI Technical Summary

Problems solved by technology

In this technique, if a protective layer for protecting the heating body and a resistance element with a positive temperature coefficient are provided not only on the heating body but also on a resistance element thicker

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