Image fixing device

Abstract

The invention provides an image fixing device which is used to heat and fix a fixer image on a recording medium to form a permanent image. The image fixing device comprises an image fixing roller and a heater. The outer circumference of the image fixing roller contacts with the recording medium on which the fixer image is arranged to heat and fix the fixer image on the recording medium, and at least the part of the image fixing roller, which corresponds to the fixer image of the recording medium forms a sealed room. At least part of the heater is located inside the sealed room of the image fixing roller to heat the image fixing roller. According to the invention, the heat loss between the heater and the image fixing roller of the image fixing device provided by the invention can be reduced and the heat conduction efficiency can be improved.

Description

Technical field [0001] The present invention relates to a fixing device for heating and fixing a fixing agent image on a recording medium, and more particularly to a fixing device that forms a closed space inside a fixing roller. Background technique [0002] In the past, an image forming apparatus using an electrophotographic method is a well-known technology. For example, an electrostatic latent image is formed on the surface of a photoreceptor drum as an image carrier, and the electrostatic latent image on the photoreceptor drum is fixed and visualized by a fixing agent, etc., and the fixed image is transferred to a recording medium by a transfer device An image is carried on (for example, paper), and then the fixing agent image on the recording medium is fixed by a heating and pressurizing fixing device, and the fixed recording medium is discharged to the outside of the device through a discharge path. [0003] In the fixing device, a fixing roller for heating, a pressure roll...

AI Technical Summary

Problems solved by technology

[0006] Since the fixing heating method of the above-mentioned prior art is an open heating method, the heat conduction efficiency is not high, resulting in waste of energy, and in addition, it may cause a problem of poor fixability at the end of the recording medium.

And, if, as mentioned above, the heating value of the heater near the opening of the fixing roller is increased so that the fixing roller is heated evenly, not only energy is wasted, but also the manufacturing cost of the heater will increase.

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