White vector adjustment via exposure using two optical sources

Details White vector adjustment via exposure using two optical sources White vector adjustment via exposure using two optical sources

2007-01-05

2009-10-20

Tran, Huan H (Department: 2861)

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C347S233000

Reexamination Certificate

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07605834

ABSTRACT:
The white vector—the voltage difference between white areas of a latent image on a photoconductive unit and a developer roller—may be independently adjusted at each photoconductive unit, allowing multiple image forming units to be driven from a shared power supply. The photoconductive unit is charged to a high voltage level relative to the developer roller, and selectively optically discharged to the desired white vector by a first laser source. The voltage of the discharged area may be measured, or may be calculated by increasing the developer roller voltage a predetermined amount, discharging the photoconductive unit until toner is sensed in white image areas, and then reducing the developer roller voltage. The white areas are discharged using a different light source, such as a laser, LED or electroluminescent source. A second laser may be of a different wavelength than a writing laser.

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