| 摘要 |
The present invention extends the lives of a photosensitive drum and a cleaning blade. A magnetic brush charging device is excellent in charging performance, and is effective to realize being ozoneless and the smoothing of the photosensitive drum, and the removal of a fused material therefrom. However, due to the smoothing action, a lubricant such as a toner decreases between the photosensitive drum and the edge portion of the cleaning blade, whereby the frictional force of the edge portion is increased and scraping-through by chattering of the toner becomes great. So, inorganic fine particles having the lubricating action are contained in at least the edge portion. Thereby, the hardness of the edge portion crises and the property thereof following the unevenness of the surface of the photosensitive drum is lowered, but the surface of the photosensitive drum is smooth and therefore, sufficient cleaning performance can be secured.
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