| 摘要 |
The present invention provides an improved elastic material which is free of roller abrasion when used in development rollers and overcomes disadvantages of the conventional silicone rollers of deterioration in the abrasion resistance, an elastic roller employing such elastic materials, and an electrophotographic apparatus and electrostatic recording apparatus incorporating such rollers. The elastic material satisfies a relationship represented by the following equation: <?in-line-formulae description="In-line Formulae" end="lead"?>log{(Tb.Eb)<SUP>-1</SUP>}<=-0.0011(Hd)<SUP>2</SUP>+0.1154(Hd)-5.6<?in-line-formulae description="In-line Formulae" end="tail"?> where Tb is the tensile strength (N/mm<SUP>2</SUP>), Eb is the tension fracture elongation (%) and Hd is the Asker C hardness (°). Further, the present invention provides a novel developer carrier for use with an imaging apparatus and an imaging apparatus incorporating the developer carrier. The developer carrier includes an electrically conductive elastic layer and is arranged in contact with, or in the proximity of, an imaging body. In the developer carrier, the conductive elastic layer satisfies the equation: <?in-line-formulae description="In-line Formulae" end="lead"?>0.01<=S.T/Hd<=2.0<?in-line-formulae description="In-line Formulae" end="tail"?> where S is the compressive permanent set (%), T is the thickness of the elastic layer (mm), and Hd is the Asker C hardness (°).
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