Electricity: electrical systems and devices – Electric charge generating or conducting means
Patent
1994-12-12
1996-06-11
Fleming, Fritz M.
Electricity: electrical systems and devices
Electric charge generating or conducting means
361225, 355221, H01T 2300
Patent
active
055262228
ABSTRACT:
In a xerographic image, where a darker area is separated by a lighter area across a sharp boundary, there is an edge enhancement effect where there will be a black outline around the darker area and a white outline around the lighter area. In x-ray mammography, the effect is that the skin line will be darkened for a positive image and lightened for a negative image, and a loss of detail at the skin line will result. To increase visible detail at the skin line without increasing the radiation, a recharging scorotron can be used between the imaging and toner stations to recharge back to a low level of charge only those areas of the latent image that have been fully discharged. All other areas are allowed to remain unchanged. The result is a reduction of skin line deletions at a reduced x-ray exposure. Such a scorotron, in the shape of a box around the corona wires, can be constructed using a conductive top, insulative sides and a screen bottom. The top is held at approximately 200 volts, and the screen, made of fine wire, closely spaced, is held at about 40 volts. The distance from screen to photoreceptor is about 0.06 inches.
REFERENCES:
patent: 4837658 (1989-06-01), Reale
patent: 5025155 (1991-06-01), Hattori
patent: 5365317 (1994-11-01), Folkins et al.
Cunha Robert
Fleming Fritz M.
Xerox Corporation
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