FIXING DEVICE AND IMAGE FORMING APPARATUS

To solve the problem in which: an annular fixing belt of a fixing device desirably has a thicker elastic layer and a thinner surface layer to perform high-speed printing; however, excessive degree of thickness and thinness causes PFA cracks in a PFA surface of the surface layer.SOLUTION: A fixing de...

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Bibliographic Details
Main Author FURUKAWA TAKAO
Format Patent
LanguageEnglish
Japanese
Published 08.04.2022
Subjects
CINEMATOGRAPHY
ELECTROGRAPHY
ELECTROPHOTOGRAPHY
HOLOGRAPHY
MAGNETOGRAPHY
PHOTOGRAPHY
PHYSICS
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Summary:To solve the problem in which: an annular fixing belt of a fixing device desirably has a thicker elastic layer and a thinner surface layer to perform high-speed printing; however, excessive degree of thickness and thinness causes PFA cracks in a PFA surface of the surface layer.SOLUTION: A fixing device comprises: a cylindrical fixing belt 32 with an inner diameter r that has at least an elastic layer 32b with a thickness b composed of an elastic member and a surface layer with a thickness a formed on a top face of the elastic layer; and a pressure roller 33 that is in contact with the fixing belt 32 to form a nip area. When the thickness of the fixing belt is x, and a nip width in a short direction of the nip area is Y, x(Y/r)≤245 μm is satisfied.SELECTED DRAWING: Figure 11 【課題】定着装置の環状の定着ベルトは、高速印刷に対して、弾性層は厚め、表面層は薄めに形成することが望ましいが、程度を超えると表面層のＰＦＡ表面にＰＦＡ割れが発生する問題があった。【解決手段】弾性部材からなる厚さｂの弾性層３２ｂ、弾性層の上面に形成される厚さａの表面層を少なくとも有する内径ｒの円筒状の定着ベルト３２と、定着ベルト３２に接してニップ領域を形成する加圧ローラ３３とを備え、定着ベルトの厚さをｘ、ニップ領域の短手方向のニップ幅をＹとしたとき、ｘ（Ｙ／ｒ）≦２４５μｍ を満たすようにする。【選択図】図１１
Bibliography:Application Number: JP20200162847