現像装置及び画像形成装置

Developing device and image forming apparatus

Abstract

【課題】現像装置4内のトナー残量が少なくなった場合に、トナーが残留しているにも関わらず発生する濃度薄を低減する。 【解決手段】少なくとも供給ローラ19と、現像ローラ17と、当接手段22により区切られた略閉領域Tであって、供給ローラ19の表面のうち当接手段22が当接する位置よりも供給ローラ19の表面移動方向上流側で、かつ現像ローラ17との接触部よりも供給ローラの表面移動方向下流側の領域を含む略閉領域Tを現像装置4内に形成し、供給ローラ17の表面に当接手段22が当接する位置が、現像ローラ17との接触部よりも供給ローラ19の表面移動方向下流側で、かつ供給ローラ19の半径が小さくなる方向(圧縮方向)の変形量が0より大きい領域であることを特徴とする。 【選択図】図5
PROBLEM TO BE SOLVED: To decrease a reduced concentration of a toner, which occurs regardless of the toner remaining when a toner residual amount in a developing device 4 decreases.SOLUTION: A substantially closed region T segmented by at least a supply roller 19, a developing roller 17 and contact means 22 is formed in a developing device 4, the substantially closed region T which includes a region located at an upstream side on a surface of the supply roller 19 than a position in contact with the contact means, along the moving direction of the surface of the supply roller 19, as well as at a downstream side than a contact part with the developing roller 17 along the moving direction of the surface of the supply roller. The position where the contact means 22 is in contact with the surface of the supply roller 19 is at the downstream side of the contact part with the developing roller 17, along the moving direction of the surface of the supply roller 19; and a deformation amount of the supply roller 19 in a direction where the radius of the supply roller 19 decreases (in a compression direction) is larger than 0.

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Patent Citations (5)

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