定着装置

Fixing device

Abstract

【課題】記録材上の未定着トナー像の表面部を溶融できるようにするため、ニップ部の記録材搬送方向上流側で加熱体支持部材の可撓性部材と接触する領域の面積を小さくし可撓性部材の温度低下を減少させるようにした定着装置の提供。 【解決手段】ニップ部Nよりも記録材搬送方向の上流側の加熱体支持部材1の部分に、前記ニップ部の接線Laに対してバックアップ部材5側に突出し可撓性部材2と接触する突出部12が設けられており、前記加熱体支持部材の前記ニップ部よりも上流側の部分のうち前記突出部が設けられた領域全体の面積に対する前記突出部と前記可撓性部材との接触面積比率が50%以下であることを特徴とする。 【選択図】図1
PROBLEM TO BE SOLVED: To provide a fixing device configured to lessen temperature fall of a flexible member by reducing area of a region where a heating body supporting member comes into contact with the flexible member on an upstream side of a nip part in a recording material conveying direction in order to melt a surface part of an unfixed toner image on a recording material.SOLUTION: A projecting part 12 projecting to a backup member 5 side with respect to a tangential line La of a nip part N and coming into contact with a flexible member 2 is provided at a portion of a heating body supporting member 1 on a more upstream side in a recording material conveying direction than the nip part N, and ratio of contract area of the projecting part with the flexible member to area of the entire region in which the projecting part is provided, out of the portion of the heating body supporting member on a more upstream side than the nip part, is 50% or less.

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Patent Citations (5)

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