Charge screening member for a corona discharge device of an imag

Details Charge screening member for a corona discharge device of an imag Charge screening member for a corona discharge device of an imag

1995-07-11

1996-11-19

Ramirez, Nestor R.

Photocopying

Contact printing

Light boxes

355221, G03G 1502

Patent

active

055768091

ABSTRACT:
An image forming apparatus comprises a rotatable image carrying member, a charger, a scanner unit for forming a latent image at an exposure position on the surface of the image carrying member charged by the charger, a developing device for converting the latent image to a toner image, and a transfer roller for transferring the toner image on the image carrying member to a recording paper by application of a transfer voltage to the toner image. A conductive member is provided on a charger case covering the charger adjacent to the charger and between the charger and the exposure position. The conductive member is positioned close to the surface of the photosensitive drum. Thus, ions (positive charges) generated by the charger are prevented from reaching the exposure position where the latent image is formed. As a result, negative effects on the image quality of the toner image caused by ions generated by the charger inadvertently recharging discharged portions of the surface of the image carrying member can be averted. Additionally, the image forming apparatus comprises a pre-charging device for emitting light to fully discharge the image carrying member before it is charged by the charger. A blocking wall extends circumferentially along the image carrying member from a partition wall positioned between the charger and the pre-charging device. The blocking wall prevents light emitted by the pre-charging device from reaching the charger, thus preventing the pre-charger from inadvertently discharging the image carrying member.

REFERENCES:
patent: 4053769 (1977-10-01), Nishikawa et al.
patent: 4326794 (1982-04-01), Nishimura
patent: 4785324 (1988-11-01), Yamazaki et al.
patent: 4974021 (1990-11-01), Takemoto
patent: 5250992 (1993-10-01), Tsuneeda et al.
patent: 5291247 (1994-03-01), DeCecca

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