| 摘要 |
The present invention provides a one-way heat fixing device for developers in which thermal energy from the fixing roller is provided to the unfixed developer on a recording medium. The fixing device includes a fixing roller, which is heated to and maintained at a predetermined temperature, and a pressing roller, which maintains contact with the fixing roller. Recording media carrying an unfixed developer thereon are contacted between the fixing roller and the pressing roller so that at the moment of fixing the developer, the magnitude of thermal energy (Qh) to be fed from the fixing roller to the developer and the recording medium, and the magnitude of thermal energy (Qp) to be fed from the pressing roller to the developer and the recording medium is defined by the following formula:and the temperature difference between the temperature of the uppermost layer of the developer and the temperature of the lowermost layer of the developer is maintained in accordance with the following formula:wherein Wn is the width (in mm) of the press-contact portion of the recording medium and Vp (in mm/sec) is the transferring speed of the device.
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