Method of eliminating background residual charge in electrophoto

Details Method of eliminating background residual charge in electrophoto Method of eliminating background residual charge in electrophoto

1977-11-30

1981-05-12

Willis, Davis L.

Radiant energy

Source with charged plate-type detector

430103, 118654, 355 3DD, 427 141, G03G 1300, G03G 1500

Patent

active

042674506

ABSTRACT:
In an exemplary embodiment, a charge image resulting from x-ray exposure of a plate originally charged to 1.5 to 5 kV, is developed by applying powder of opposite polarity while applying a voltage of from 1 to 4.5 kV, also of opposite polarity, to a conductive backing for neutralizing the effect of image background charge. A grid is spaced a small distance from the charge image and receives a voltage of about 1000 volts for controlling edge emphasis. For a positive charge image and negatively charged powder, a negative potential of e.g. -2500 volts may be applied to the backing for the photoconductive layer and +1000 volts may be applied to the grid.

REFERENCES:
patent: 3603790 (1971-09-01), Cleare
patent: 3813546 (1974-05-01), Proudian
patent: 3949222 (1976-04-01), Lewis
patent: 3967891 (1976-07-01), Rippstein
patent: 3997259 (1976-12-01), Bhagat
patent: 4027158 (1977-05-01), Reiss
Thomas L. Thourson, "Xeroradiography," SPIE vol. 56 (1975), pp. 225 to 235.

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