Two new solid state devices which produced an atmospheric air corona discharge for generating and depositing a layer of static charge for Xerographic imaging have been fabricated and characterized. One type had a parallel plate capacitive structure and the other had an interdigitated capacitive structure. It was determined that the interdigitated capacitive structure performed better than the parallel plate capacitive structure in terms of reduced power consumption, charging current stability and device reliability. Several metal electrode material alternatives were investigated and gold electrodes performed the best. The air corona’s light emission peaks were measured to be in the 350 nm to 400 nm range. Ozone gas by-product generation to ~ 13 ppm was detected for an active surface area of 5 cm^2. Charge deposition
on to an imaging drum surface with a significant charging current density of 1.6E-4 A/cm^2 has been successfully demonstrated.
We present a document imaging system using page-sized amorphous silicon 2D sensor arrays. Two arrays of approximately 8' X 10' in area are used. One has 512 X 560 pixels and the other one has 1536 X 1920 pixels. The scanner can operate in either a contact imaging mode or a projection mode. The system has a signal-to-noise ratio of 1000, limited by the noise in the readout amplifier. Using sequential flash lamp exposures with appropriate color filters, one can achieve color imaging of a document with a perfect registration. In this paper, we describe sensor structure, electrical properties, and system design of the imager. We discuss the potential of the amorphous silicon sensor array as an electronic color document input device. The high sensitivity of the array allows high-speed scanning of a document and medical x-ray imaging (with a phosphor layer).
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