Reversal developing system preventing occurrence of image spots

Details Reversal developing system preventing occurrence of image spots Reversal developing system preventing occurrence of image spots

1994-02-25

1996-08-20

Beatty, Robert

Photocopying

Contact printing

Light boxes

355219, 355268, G03G 1516

Patent

active

055483879

ABSTRACT:
A reversal developing system using a photosensitive material that can be electrically charged into both a positive polarity and a negative polarity, and a DC voltage applied to the transfer roller has a polarity opposite to and more than 1.5 times as great than that of the charge start potential by the primary charger, and is so set that the potential on the surface of the photosensitive material after discharge is 50 V or smaller in absolute value. Therefore, the discharging is effectively carried out after the image has been formed, the photosensitive material is uniformly and effectively charged by the main charger even in the subsequent cycle of forming image, a good image is formed without image spots, and the toner image formed on the photosensitive material is transferred maintaining a high transfer efficiency. The transfer roller is arranged to have a gap between the transfer roller and photosensitive surface between 0.3 to 0.7 mm.

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patent: 5386279 (1995-01-01), Fukami et al.

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