Photocopying – Contact printing – Light boxes
Patent
1994-06-29
1996-10-29
Smith, Matthew S.
Photocopying
Contact printing
Light boxes
355219, 361225, 361230, G03G 1502
Patent
active
055701639
ABSTRACT:
In a charging device constituted by a charging wire and a shield case having a U-shaped sectional structure which surrounds the charging wire and has an opening portion opposing a photosensitive body, the peak of a current flowing from the opening of the shield case onto the photosensitive body is offset to the upstream side in the rotational direction of the photosensitive body with respect to the central position of the shield case to uniform a charging potential at an outlet portion of the shield case. According to the above charging device, the peak of the charging flow-in current is offset to the upstream side in the rotational direction of the photosensitive body with respect to the central position of the shield case. For this reason, the peak of discharging is present near the inlet portion of the shield case, and a half or more of a finally obtained halftone potential is obtained on the inlet side. However, a charging irregularity occurs due to a large potential ripple. At the outlet position of the shield case, although an amount of charge contributing to a charging operation is smaller than that of the inlet position, an amount of charge for uniforming the charging operation increases. For this reason, the potential ripple decreases, and the charging operation is uniformed finally. Therefore, even when a photosensitive body having a small surface roughness and subjected to a mirror-surface process is used, a charging operation free from ununiformity of a halftone image can be performed.
REFERENCES:
patent: 3762811 (1973-10-01), Matsumoto
patent: 3900776 (1975-08-01), Lauker
patent: 4908513 (1990-03-01), Masuda et al.
patent: 5173734 (1992-12-01), Shimizo et al.
Kabushiki Kaisha Toshiba
Smith Matthew S.
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