| 摘要 |
An apparatus includes first and second developing sleeves which are sequentially arranged in this order along a rotational direction of a photosensitive body to face the photosensitive body. The first developing sleeve has a first diameter, carries a layer of a first toner on its surface, and causes layer of the first toner to face a first latent image upon rotation thereof. The second developing sleeve has a second diameter larger than the first diameter, carries a layer of a second toner on its surface, and causes the layer of the second toner to face a second latent image upon rotation thereof after the layer of the first toner is caused to face the first latent image. A superposed developing bias voltage of DC and AC is applied between the photosensitive body and the first developing sleeve, so that the first toner flies from the first developing sleeve to the photosensitive body to develop the first latent image. A DC developing bias voltage is applied between the photosensitive body and the second developing sleeve, so that the second toner flies from the second developing sleeve to the photosensitive body to develop the second latent image.
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