发明授权
US06226487B1 Transfer and fixing device having specific nip ratio 有权
具有特定辊隙比的转印和定影装置

Transfer and fixing device having specific nip ratio
摘要:
The present invention provides an image forming apparatus which adopts a simultaneous transfer and fixing method and is capable of obtaining a high-grade image which has high luster, a favorable balance of color and an excellent transparency. In an image forming apparatus provided with a transfer and fixing device which includes a heating roller and a pressure roller for transferring and fixing a toner image on an intermediate transfer body to a recording medium, the transferring and fixing operation is carried out using the heating roller and the pressure roller under a condition that the ratio a/b between the length a of a nip region N of the heating roller and the pressure roller in a direction A at the central portion of these rollers extending in a roller axial direction and the length b of the nip region N in the direction A at both ends of these rollers extending in the roller axial direction is set to be more than 0.8.
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