| 摘要 |
<p>A laser printer performing a developing operation on a positively chargeable photosensitive drum (20) with using positively chargeable toners. The printer includes photosensitive drum (20), a laser scanner unit (30) for forming an electrostatic latent image on the photosensitive drum (20), a developing roller (56) for developing the electrostatic latent image by a toner layer consisting of toners having positively chargeable characteristic, a thickness regulation blade (57) for regulating the thickness of the toner layer on the developing roller (56) such that the amount of toners in the toner layer is not more than 0.5mg/cm<2>, a scorotron charger (40) confronting the photosensitive drum (20) in out of contact therefrom for charging the rotating photosensitive drum (20) to the positive polarity, and a transfer roller (60) for transferring the toner image onto a printing sheet. By the thickness regulation of the toner layer, each toner is surely imparted with positive polarity. Residual toners on the photosensitive drum are not deposited on the charger, because the charger is spaced away from the drum.</p> |
